CN109653731A - The method and device of coaxial type geothermal well capability forecasting - Google Patents
The method and device of coaxial type geothermal well capability forecasting Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention discloses a kind of method and devices of coaxial type geothermal well capability forecasting, this method comprises: determining bushing temperature according to the energy variation relationship of cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well；Coaxial type geothermal well is from center outward successively including central tube, casing, cement sheath, cement sheath and stratum are adjacent, annular fluid is between central tube and casing, according to bushing temperature and annular fluid, the energy variation relationship of central tube, determine the difference of annular fluid temperature Yu central tube temperature, according to the difference of annular fluid temperature and central tube temperature, coaxial type underground heat well capacity is determined.The present invention not only allows for the energy variation of stratum, cement sheath, casing and central tube, also contemplate influence of the annular fluid to coaxial type geothermal well energy variation, that is the energy variation of annular fluid, therefore more accurate to express the energy variation of coaxial type geothermal well, and then the accuracy of coaxial type geothermal well capability forecasting can be improved.
Description
Technical field
The present invention relates to geothermal well technical field of heat transfer more particularly to the methods and dress of coaxial type geothermal well capability forecasting
It sets.
Background technique
This part intends to provides background or context for the embodiment of the present invention stated in claims.Description herein
Recognize it is the prior art not because not being included in this section.
Since the 21th century, with the development of the global economy, world energy sources demand growth is powerful, and imbalance between supply and demand day is becoming tight
, the competition of the energy such as prevailing petroleum, coal is fiercer in energy-consuming, and energy security faces a severe challenge.
Traditional fossil energy bring resource exhaustion and environmental pollution is getting worse simultaneously.Underground heat as it is a kind of cleaning, it is renewable
The energy, to alleviating, energy supply and demand contradiction, improving the ecological environment plays an important role.Therefore, accelerate efficiently opening for geothermal energy resources
It is imperative that hair utilizes.
Adopting water and taking heat is the basic development scheme of geothermal energy resources.But its restricted application, and from the underground mining water capacity
The problems such as easily causing level of ground water decline and surface subsidence.Therefore, carry out adopting water take heat when, it is necessary to by tail water recharge to underground heat
Reservoir, i.e., different well circulation geothermal system.But due to the limitation of reservoir properties, tail water recharge is difficult, takes the thermal efficiency low etc. is still remained
Problem.The drilling hole number of the more different well circulatory system is developed simultaneously, has also caused that occupied area is larger, and management is inconvenient, initial stage
The problems such as high is invested, the utilization of its large-scale promotion is limited.
In order to ensure the sustainable development of geothermal energy resources, tail water recharge is avoided, cost is reduced, can followed using individual well enclosed
Ring takes the development mode of heat.It wherein, is ground-source heat pump system for the typical development mode of geothermal, underground is by U-shaped
Circulation of fluid and external agency in heat exchanger tube carry out heat exchange, are then converted low grade heat energy to using earth source heat pump on ground
High-grade thermal energy.But since its heat exchange area is limited, the exploitation of medium and deep geothermal energy resources takes the thermal efficiency lower, business
Benefit is undesirable.
For above situation, individual well coaxial type type heat-exchange system is proposed, enclosed of the working medium in annular space and inner tube is passed through
Circulation carries out heat convection with stratum, while heat-exchange system has bigger heat exchange area, and heat exchange effect on the one hand can be enhanced
On the other hand fruit can permit more fluid and be recycled, raising takes thermal power.However, utilizing individual well coaxial type type at present
When the heat transfer model of heat-exchange system predicts coaxial type underground heat well capacity, the energy quantitative change of coaxial type geothermal well itself is only considered
Change, have ignored the influence that fluid generates coaxial type geothermal well in stratum, thus leads to not accurately express and prediction is coaxial
Type underground heat well capacity.
Therefore, the prediction of existing coaxial type underground heat well capacity, which exists, is unable to asking for Accurate Prediction coaxial type underground heat well capacity
Topic.
Summary of the invention
The embodiment of the present invention provides a kind of method of coaxial type geothermal well capability forecasting, produces to improve coaxial type geothermal well
Foreseeable accuracy, this method comprises:
It is determined according to the energy variation relationship of cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Bushing temperature；Coaxial type geothermal well successively includes central tube, casing, cement sheath from center outward, and cement sheath and stratum are adjacent, ring
Empty fluid is between central tube and casing；
According to bushing temperature and annular fluid, the energy variation relationship of central tube, annular fluid temperature and central tube are determined
The difference of temperature；
According to the difference of annular fluid temperature and central tube temperature, coaxial type underground heat well capacity is determined.
The embodiment of the present invention also provides a kind of device of coaxial type geothermal well capability forecasting, to improve coaxial type geothermal well
The accuracy of capability forecasting, the device include:
Bushing temperature determining module, for according in the energy variation relationship on stratum, coaxial type geothermal well cement sheath and
The energy variation relationship of casing determines bushing temperature；Coaxial type geothermal well is from center outward successively including central tube, casing, cement
Ring, cement sheath and stratum are adjacent, and annular fluid is between central tube and casing；
Difference determining module, for determining annular space according to bushing temperature and annular fluid, the energy variation relationship of central tube
The difference of fluid temperature (F.T.) and central tube temperature；
Production capacity determining module determines coaxial type geothermal well for the difference according to annular fluid temperature and central tube temperature
Production capacity.
In the embodiment of the present invention, according to the cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Energy variation relationship determines bushing temperature；Coaxial type geothermal well is from center outward successively including central tube, casing, cement sheath, water
Mud ring and stratum are adjacent, and annular fluid is between central tube and casing, according to bushing temperature and the energy of annular fluid, central tube
Variation relation is measured, determines the difference of annular fluid temperature Yu central tube temperature, according to annular fluid temperature and central tube temperature
Difference determines coaxial type underground heat well capacity.The embodiment of the present invention is not only allowed for when determining coaxial type underground heat well capacity
The energy variation of coaxial type geothermal well itself, the i.e. energy variation of stratum, cement sheath, casing and central tube, also consider simultaneously
Influence of the annular fluid to coaxial type geothermal well energy variation, the i.e. energy variation of annular fluid, therefore more accurate table
The energy variation of coaxial type geothermal well has been reached, and then the accuracy of coaxial type geothermal well capability forecasting can be improved.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of coaxial type geothermal well provided in an embodiment of the present invention；
Fig. 2 is the implementation flow chart of the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention；
Fig. 3 is the implementation process of step 201 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Fig. 4 a is the relation schematic diagram of coaxial type geothermal well and anhydrous stratum provided in an embodiment of the present invention；
Fig. 4 b is the relation schematic diagram of coaxial type geothermal well and water breakthrough stratum provided in an embodiment of the present invention；
Fig. 5 is the implementation process of step 202 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Fig. 6 is the implementation process of step 302 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Fig. 7 is the implementation process of step 303 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Fig. 8 is the implementation process of step 501 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Fig. 9 is the implementation process of step 502 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Figure；
Figure 10 is the functional block diagram of the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention；
Figure 11 is the device middle sleeve temperature determination module of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
1001 structural block diagram；
Figure 12 is difference determining module 1002 in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Structural block diagram；
Figure 13 is that cement sheath temperature determines list in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural block diagram of member 1102；
Figure 14 is the device middle sleeve temperature determining unit of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
1103 structural block diagram；
Figure 15 is that annular space fluid temperature (F.T.) determines in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural block diagram of unit 1201；
Figure 16 is that central tube temperature determines list in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural block diagram of member 1202.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Fig. 1 shows the structural schematic diagram of coaxial type geothermal well provided in an embodiment of the present invention, for ease of description, only showing
Part related to the embodiment of the present invention, details are as follows:
Coaxial type geothermal well successively includes central tube, casing, cement sheath from center outward, and cement sheath and stratum are adjacent, ring
Empty fluid is between central tube and casing.In a further embodiment, the central tube of coaxial type geothermal well is outside from center
It successively include the first central tube, the second central tube and third central tube.
As shown in Figure 1, coaxial type geothermal well from center outward successively include: the first central tube, the second central tube and
Three central tubes, casing, cement sheath, cement sheath and stratum are adjacent, and annular fluid is between central tube and casing.
Wherein, it (is exactly cylindrical body axially usually for cylindrical shape object that center pipe fluid, which not only exists axial,
The direction of Pivot axle, i.e. direction shown in arrow at center pipe fluid in Fig. 1) energy transmission, there is also radially (diameters
To the direction referred in plane by axial line, or perpendicular to the rectilinear direction of axis) with the energy transmission of annular fluid, this two
Partial energy transmission results in the energy variation of center pipe fluid jointly.
There is only the energy transmissions in axial direction for annular fluid, and there is also the energy transmissions radially with center pipe fluid；
In addition, there is also radially with the energy transmission of casing, the energy transmission of this three parts results in Annular cutting jointly for annular fluid
The energy variation of body.
Casing not there is only the energy transmission in axial direction, there is also radially with the energy transmission of annular fluid, Yi Jijing
Upwards with the energy transmission of cement sheath, the energy transmission of this three parts results in the energy variation of casing jointly.
Cement sheath is not there is only the energy transmission in axial direction, and radial there is also radially with the energy transmission of casing
Upper and stratum energy transmission, the energy transmission of this three parts result in the energy variation of cement sheath jointly.
Wherein, stratum includes anhydrous stratum or water breakthrough stratum.It there is only the energy transmission in axial direction, does not deposit also on anhydrous stratum
Energy transmission in energy transmission and transverse direction in the radial direction, the energy transmission of this three parts result in anhydrous stratum jointly
Energy variation.There is only the energy transmissions in axial direction on water breakthrough stratum, and there is also in energy transmission and transverse direction radially
Energy transmission caused by energy transmission and Groundwater Flow, this tetrameric energy transmission result in water breakthrough stratum jointly
Energy variation.
Fig. 2 shows the implementation processes of the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention, for just
In description, only parts related to embodiments of the present invention are shown, and details are as follows:
As shown in Fig. 2, the method for coaxial type geothermal well capability forecasting comprising:
Step 201, according to the energy variation of cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Relationship determines bushing temperature；Coaxial type geothermal well from center outward successively include central tube, casing, cement sheath, cement sheath and ground
Layer is adjacent, and annular fluid is between central tube and casing.
Step 202, according to bushing temperature and annular fluid, the energy variation relationship of central tube, annular fluid temperature is determined
With the difference of central tube temperature；
Step 203, according to the difference of annular fluid temperature and central tube temperature, coaxial type underground heat well capacity is determined.
In embodiments of the present invention, coaxial type geothermal well is from center outward successively including central tube, casing, cement sheath, water
Mud ring and stratum are adjacent, and annular fluid is between central tube and casing.
According to law of conservation of energy, energy will not both generate without foundation, will not disappear without foundation, can only be from an object transfer
Another object is given, and the form of energy can be converted mutually.Therefore, stratum, the cement sheath in coaxial type geothermal well, casing
Between energy transmission can occur, stratum, the cement sheath in coaxial type geothermal well and casing can generate energy variation.And then basis
The energy variation relationship on stratum, cement sheath and casing energy variation relationship in coaxial type geothermal well are with can determining coaxial type
The bushing temperature of hot well.
Likewise, can be further according to the energy variation relationship of bushing temperature and annular fluid, the energy of central tube
Variation relation, determines the annular fluid temperature and central tube temperature of coaxial type geothermal well, and then can determine annular fluid temperature
With the difference of central tube temperature.Finally, being determined according to the relationship of coaxial type geothermal well taken between thermal power and central tube temperature
Coaxial type geothermal well takes thermal power, i.e. coaxial type underground heat well capacity.
In embodiments of the present invention, according to the cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Energy variation relationship determine bushing temperature, according to bushing temperature and annular fluid, the energy variation relationship of central tube, determine ring
The difference of empty fluid temperature (F.T.) and central tube temperature, according to the difference of annular fluid temperature and central tube temperature, with determining coaxial type
Hot well capacity.The embodiment of the present invention not only allows for coaxial type geothermal well itself when determining coaxial type underground heat well capacity
Energy variation, i.e. the energy variation of stratum, cement sheath, casing and central tube, while also contemplating annular fluid to coaxial
The influence of type geothermal well energy variation, the i.e. energy variation of annular fluid, therefore more accurate express coaxial type geothermal well
Energy variation, and then the accuracy of coaxial type geothermal well capability forecasting can be improved.
Fig. 3 shows the realization of step 201 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in figure 3, step 201, according to the energy variation relationship on stratum, coaxial type
The energy variation relationship of cement sheath and casing in hot well determines bushing temperature, comprising:
Step 301, formation temperature is determined according to the energy variation relationship on stratum；
Step 302, cement sheath temperature is determined according to the energy variation relationship of formation temperature and cement sheath；
Step 303, bushing temperature is determined according to the energy variation relationship of cement sheath temperature and casing.
In embodiments of the present invention, likewise, according to stratum generate energy variation can determine formation temperature, then according to
According to the energy transmission of formation temperature and cement sheath and stratum, casing, i.e. the energy variation relationship of cement sheath, cement sheath is determined
Temperature.In addition, it is same as described above, set tube temperature further can be determined according to cement sheath temperature and the energy variation relationship of casing
Degree.
The embodiment of the present invention determines formation temperature according to the energy variation relationship on stratum, according to formation temperature and cement sheath
Energy variation relationship determine cement sheath temperature, bushing temperature is determined according to the energy variation relationship of cement sheath temperature and casing,
And coaxial type underground heat well capacity is determined with this, it can be further improved the accuracy of coaxial type geothermal well capability forecasting.
In a further embodiment, stratum includes anhydrous stratum or water breakthrough stratum.
Fig. 4 a shows the relationship signal on the coaxial type geothermal well and anhydrous stratum provided in the embodiment of the present invention, in order to just
In explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
In a further embodiment, as shown in fig. 4 a, the cement sheath in coaxial type geothermal well and anhydrous stratum are adjacent.Step
Rapid 301, formation temperature is determined according to the energy variation relationship on stratum, comprising:
Anhydrous formation temperature is determined according to the energy variation relationship on anhydrous stratum.
In a further embodiment, the energy variation relationship on anhydrous stratum can be the energy variation side on anhydrous stratum
Journey, the energy variation equation on anhydrous stratum refer to the equation for reflecting anhydrous stratum energy variation, the energy variation on the anhydrous stratum
Equation contains the energy variation on anhydrous stratum.Specifically, determining anhydrous stratum according to the energy variation relationship on anhydrous stratum
When temperature, anhydrous formation temperature can be determined according to the energy variation equation on following anhydrous stratum:
Wherein, first item on the left of the energy variation equation on anhydrous stratumIndicate the energy in anhydrous stratum axial direction
Transmitting, left side Section 2Indicate the energy transmission in anhydrous stratum transverse direction, left side Section 3Indicate anhydrous
The energy transmission of stratum radially, the energy variation equation right side on anhydrous stratumIndicate the energy on anhydrous stratum itself
Amount variation, i.e., anhydrous stratum axial direction, lateral and energy transmission radially result in the energy quantitative change on anhydrous stratum itself jointly
Change.
Wherein, λfIndicate the thermal coefficient on anhydrous stratum, unit is watt/ meter Du, i.e. W/ (mK)；TNothingIt indicates anhydrously
Layer temperature, zNothingIndicate the axial Gridding length on anhydrous stratum, unit is rice (m), xNothingIndicate the transverse grid length on anhydrous stratum,
Unit is rice (m), yNothingIndicate that the longitudinal grid length on anhydrous stratum, unit are rice (m), ρfIndicate the density on anhydrous stratum, it is single
Position is kg/m3, CfIndicate the specific heat capacity on anhydrous stratum, unit is joule/(kilogram degree), i.e. when J/ (kgK), t indicate default
Between be spaced, unit h.λ in formulaf、zNothing、xNothing、yNothing、ρf、CfAnd t is known parameter, can determine unknown parameter according to above formula
TNothing, i.e., anhydrous formation temperature.
Wherein, which is preset time interval, such as the prefixed time interval can be set
For 0.5h, it will be appreciated by persons skilled in the art that the prefixed time interval can also be set in addition to 0.5h other
Time interval, such as can the prefixed time interval be set as 0.1h or 1h, the embodiment of the present invention is not done this particularly
Limitation.
Correspondingly, step 302, determines cement sheath temperature according to the energy variation relationship of formation temperature and cement sheath, comprising:
Cement sheath temperature is determined according to the energy variation relationship of anhydrous formation temperature and cement sheath.
Fig. 4 b shows the relationship signal on the coaxial type geothermal well and water breakthrough stratum provided in the embodiment of the present invention, in order to just
In explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
In a further embodiment, as shown in fig. 4 a, the cement sheath in coaxial type geothermal well and water breakthrough stratum are adjacent.Step
Rapid 301, formation temperature is determined according to the energy variation relationship on stratum, comprising:
Water breakthrough formation temperature is determined according to the energy variation relationship on water breakthrough stratum.
In a further embodiment, the energy variation relationship on water breakthrough stratum can be the energy variation side on water breakthrough stratum
Journey, the energy variation equation on water breakthrough stratum refer to the equation of reflection water breakthrough stratum energy variation, the energy variation on the water breakthrough stratum
Equation contains the energy variation on water breakthrough stratum.Specifically, determining water breakthrough stratum according to the energy variation relationship on water breakthrough stratum
When temperature, water breakthrough formation temperature can be determined according to the energy variation equation on following water breakthrough stratum:
Wherein, first item on the left of the energy variation equation on water breakthrough stratumIndicate the energy in the axial direction of water breakthrough stratum
Transmitting, left side Section 2Indicate the energy transmission in the transverse direction of water breakthrough stratum, left side Section 3Indicate water breakthrough
The energy transmission of stratum radially, left side Section 4It indicates caused by the Groundwater Flow on water breakthrough stratum to spreading
Heat, the energy variation equation right side on water breakthrough stratumIndicate the energy variation on water breakthrough stratum itself, i.e. water breakthrough stratum
Axial, lateral and energy transmission radially results in the energy variation on water breakthrough stratum itself jointly.
Wherein, λeffIndicate water breakthrough stratum synthesis thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK)；TSeeIt indicates
Water breakthrough formation temperature, zSeeIndicate the axial Gridding length on water breakthrough stratum, unit is rice (m), xSeeIndicate the lateral net on water breakthrough stratum
Lattice length, unit are rice (m), ySeeIndicate that the longitudinal grid length on water breakthrough stratum, unit are rice (m), ρmIndicate the density of fluid,
Unit is kg/m3, CmIndicate that the specific heat capacity of fluid, unit are joule/(kilogram degree), i.e. J/ (kgK), v indicate water breakthrough stratum
In water flow velocity, unit is meter per second, i.e. m/s；ρeffIndicate the combined density on water breakthrough stratum, unit kg/m3, CeffIt indicates
The synthesis specific heat capacity on water breakthrough stratum, unit are joule/(kilogram degree), i.e. J/ (kgK), t indicate prefixed time interval, unit
For h.λ in formulaeff、zSee、xSee、ySee、ρm、Cm、v、ρeff、CeffAnd t is known parameter, can determine unknown parameter according to above formula
TSee, i.e. water breakthrough formation temperature.
In embodiments of the present invention, when determining water breakthrough formation temperature, stratum is not only allowed in axial direction, transverse direction and diameter
Upward energy transmission, it is also contemplated that convective heat transfer caused by the Groundwater Flow on water breakthrough stratum, it is more accurate express it is same
Heat transfer model of spindle-type geothermal well under the conditions of seepage action of ground water.Therefore, it is determined based on the water breakthrough formation temperature that this is obtained
Coaxial type underground heat well capacity, can further increase the accuracy of coaxial type geothermal well capability forecasting.
Correspondingly, step 302, determines cement sheath temperature according to the energy variation relationship of formation temperature and cement sheath, comprising:
Cement sheath temperature is determined according to the energy variation relationship of water breakthrough formation temperature and cement sheath.
Fig. 5 shows the realization of step 202 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in figure 5, step 202, according to bushing temperature and annular fluid, central tube
Energy variation relationship determines the difference of annular fluid temperature Yu central tube temperature, comprising:
Step 501, annular fluid temperature is determined according to the energy variation relationship of bushing temperature and annular fluid；
Step 502, central tube temperature is determined according to the energy variation relationship of annular fluid temperature and central tube；
Step 503, the difference of annular fluid temperature and central tube temperature is determined according to annular fluid temperature and central tube temperature
It is different.
In embodiments of the present invention, likewise, according to law of conservation of energy, energy will not both generate without foundation, will not be with
Sky disappears, and can only give another object from an object transfer, and the form of energy can be converted mutually.Coaxial type geothermal well
In annular fluid and center pipe fluid can generate energy variation, and then can be according to the energy quantitative change of bushing temperature and annular fluid
Change relationship determines annular fluid temperature.Equally similarly, it can be further according to the energy of annular fluid temperature and central tube
Amount variation relation determines central tube temperature.After determining the annular fluid temperature and central tube temperature in coaxial type geothermal well, i.e.,
It can determine the difference of annular fluid temperature and central tube temperature.
The embodiment of the present invention determines annular fluid temperature, root according to the energy variation relationship of bushing temperature and annular fluid
Central tube temperature is determined according to the energy variation relationship of annular fluid temperature and central tube, according to annular fluid temperature and center tube temperature
The difference for determining annular fluid temperature and central tube temperature is spent, and using the difference of annular fluid temperature and central tube temperature as base
Plinth determines coaxial type underground heat well capacity, can be further improved the accuracy of coaxial type geothermal well capability forecasting.
Fig. 6 shows the realization of step 302 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in fig. 6, step 302, is closed according to the energy variation of formation temperature and cement sheath
It is to determine cement sheath temperature, comprising:
Step 601, according to the energy variation of the axial heat conduction of cement sheath, radial heat transfer and cement sheath, cement sheath is determined
Energy variation relationship；
Step 602, the energy variation relationship based on cement sheath determines cement sheath temperature using formation temperature.
In embodiments of the present invention, the energy variation relationship of cement sheath can be the energy variation equation of cement sheath, cement
The energy variation equation of ring refers to that the equation of reflection cement sheath energy variation, the energy variation equation of the cement sheath contain cement
The energy variation of ring.Specifically, when determining cement sheath temperature according to the energy variation relationship of cement sheath, it can be according to following
The energy variation equation of cement sheath determines cement sheath temperature:
And
ΔT1=| T1-T2|；
Wherein, first item on the left of the energy variation equation of cement sheathIt indicates in cement sheath axial direction
Energy transmission, left side Section 2Section 3Indicate the cement sheath radially energy with stratum
Amount transmitting, the energy variation equation right side of cement sheathIndicate the energy variation of cement sheath itself, i.e. water
The upward energy transmission of mud annulate shaft and the energy for radially resulting in cement sheath itself jointly with casing, with the energy transmission on stratum
Amount variation.
Wherein, λceIndicate cement sheath thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK), λcaIndicate casing
Thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK)；The thermal coefficient on λ expression stratum.When stratum is anhydrous stratum, λ
For the thermal coefficient λ on anhydrous stratumf；When stratum is water breakthrough stratum, λ is the thermal coefficient λ on water breakthrough stratumeff。T1Indicate stratum
Temperature, i.e., anhydrous formation temperature TNothingOr water breakthrough formation temperature TSee.When being anhydrous stratum on the outside of coaxial type geothermal well, T1It is anhydrous
Formation temperature TNothing；When being water breakthrough stratum on the outside of coaxial type geothermal well, T1For water breakthrough formation temperature TSee。T2Indicate cement sheath temperature.
ΔT1Indicate the difference of formation temperature and cement sheath temperature, in one embodiment, Δ T1Indicate formation temperature and cement sheath temperature
The absolute value of difference.
In a further embodiment, cement sheath and stratum adjoining include: that cement sheath and the first stratum are adjacent.
z2Indicate the axial Gridding length of cement sheath, unit is rice (m), λ34Indicate the thermally conductive system of reconciliation of cement sheath and casing
Number, unit be watt/ meter Du, i.e. W/ (mK), λ45Indicate the reconciliation thermal coefficient of cement sheath and stratum, unit is watt/meter
Degree, i.e. W/ (mK), r5Indicate the half of the diameter on first stratum adjacent with cement sheath, r4Indicate the half of cement sheath outer diameter,
r3Indicate the half of sleeve outer, r2Indicate the half of casing inner diameter, ρceIndicate the density of cement sheath, unit kg/m3, CceTable
Show that the specific heat capacity of cement sheath, unit are joule/(kilogram degree), i.e. J/ (kgK), t indicate prefixed time interval, unit h.
λ, λ in formulaca、λce、T1、z2、λ34、λ45、r5、r4、r3、r2、ρce、CceAnd t is known parameter, can be determined not according to above formula
Know parameter T2, i.e. cement sheath temperature.
Fig. 7 shows the realization of step 303 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in fig. 7, step 303, is closed according to cement sheath temperature and the energy variation of casing
It is to determine bushing temperature, comprising:
Step 701, according to the energy variation of the axial heat conduction of casing, radial heat transfer and casing, the energy of casing is determined
Variation relation；
Step 702, the energy variation relationship based on casing determines bushing temperature using cement sheath temperature.
In embodiments of the present invention, the energy variation relationship of casing can be the energy variation equation of casing, the energy of casing
Amount equation of change refers to that the equation of reflection casing energy variation, the energy variation equation of the casing contain the energy quantitative change of casing
Change.Specifically, when determining bushing temperature according to the energy variation relationship of casing, it can be according to the energy variation of following casings
Equation determines bushing temperature:
And Δ T2=| T2-T3|；
Wherein, first item on the left of the energy variation equation of casingIndicate the upward energy of quill
Transmitting, 2 π r of left side Section 22h1ΔT2, Section 3Indicate casing radially with the energy transmission of cement sheath,
On the right side of the energy variation equation of casingIndicate the energy variation of casing itself, the i.e. upward energy of quill
Amount transmitting and the energy variation for radially resulting in casing itself jointly with the energy transmission of cement sheath, annular fluid.
Wherein, λcaIndicate casing thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK), z3Indicate the axial direction of casing
Gridding length, unit are rice (m), h1Indicate the convective heat-transfer coefficient of annular fluid and internal surface of sleeve pipe, unit is W/ (m2DEG C),
T2Indicate cement sheath temperature, T3Indicate bushing temperature, Δ T2The difference for indicating cement sheath temperature and bushing temperature, in an embodiment
In, Δ T2Indicate the absolute value of the difference of cement sheath temperature and bushing temperature.
λ34Indicate casing and cement sheath reconciliation thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK), Δ T indicate water
The absolute value of the difference of mud circumstance temperature degree and formation temperature, r4Indicate the half of sleeve outer, r3Indicate the half of sleeve outer, r2
Indicate the half of casing inner diameter, ρcaIndicate the density of casing, unit kg/m3, CcaIndicate that the specific heat capacity of casing, unit are coke
Ear/(kilogram degree), i.e. J/ (kgK), t indicate prefixed time interval, unit h.λ in formulaca、z3、h1、λ34、r4、r3、r2、
ρca、CcaAnd t is known parameter, and unknown parameter T can be determined according to above formula3, i.e. bushing temperature.
Fig. 8 shows the realization of step 501 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in figure 8, step 501, according to the energy variation of bushing temperature and annular fluid
Relationship determines annular fluid temperature, comprising:
Step 801, according to the energy variation of the axial heat conduction of annular fluid, radial heat transfer and annular fluid, ring is determined
The energy variation relationship of empty fluid；
Step 802, the energy variation relationship based on annular fluid determines annular fluid temperature using bushing temperature.
In embodiments of the present invention, the energy variation relationship of annular fluid can be the energy variation equation of annular fluid,
The energy variation equation of annular fluid refers to the equation of reflection annular fluid energy variation, the energy variation equation of the annular fluid
Contain the energy variation of annular fluid.Specifically, determining annular fluid temperature according to the energy variation relationship of annular fluid
When, annular fluid temperature can be determined according to the energy variation equation of following annular fluids:
And
And Δ T3=| T3-T4|；
Wherein, first item on the left of the energy variation equation of annular fluidIndicate the energy in annular fluid axial direction
Amount transmitting, 2 π R of left side Section 21ΔT3, 2 π r of Section 32h1ΔT3Indicate annular fluid radially with the energy transmission of cement sheath,
On the right side of the energy variation equation of annular fluidIndicate the energy variation of annular fluid itself, i.e. annular space
The upward energy transmission of flow axis and radially the energy transmission with center pipe fluid, cement sheath results in annular fluid jointly
The energy variation of itself.
Wherein, ρmIndicate the density of fluid, unit kg/m3, CmIndicate that the specific heat capacity of fluid, unit are joule/(thousand
Gram degree), i.e. J/ (kgK), q indicate fluid flow in prefixed time interval t, z4Indicate the axial grid of annular fluid
Length, unit are rice (m), R1The thermal contact resistance of expression center pipe fluid and central tube tube wall, unit are (m DEG C)/W.T3It indicates
Bushing temperature, T4Indicate annular fluid temperature, Δ T3Indicate the difference of bushing temperature and annular fluid temperature, in one embodiment,
ΔT3Indicate the absolute value of the difference of bushing temperature and annular fluid temperature.T indicates prefixed time interval, unit h.
λ12Indicate the reconciliation thermal coefficient of the first central tube and the second central tube, unit is that unit is watt/ meter Du, i.e. W/
(mK), λ23Indicate the reconciliation thermal coefficient of the second central tube Yu third central tube, unit is that unit is watt/ meter Du, i.e. W/
(mK), λdpIndicate central tube thermal coefficient, unit be watt/ meter Du, i.e. W/ (mK), λairIndicate the thermally conductive system of air
Number, unit be watt/ meter Du, i.e. W/ (mK).
h1Indicate the convective heat-transfer coefficient of annular fluid and internal surface of sleeve pipe, unit is W/ (m2DEG C), h2Indicate central tube stream
The convection transfer rate of body and center inside pipe wall, unit are W/ (m2DEG C), h3Indicate the convection current of annular fluid and center pipe outer wall
The coefficient of heat transfer, unit are W/ (m2·℃)；r1Indicate the half of the first inner diameter of centerpipe, r2Indicate the half of casing inner diameter, r11Table
Show the half of the first center pipe outside diameter, r12Indicate the half of the second center pipe outside diameter, r13Indicate the one of third layer center pipe outside diameter
Half.ρ in formulam、Cm、q、z4、R1、λ12、λ23、h1、h2、h3、r2、r1、r11、r12、r13And t is known parameter, it can be according to upper
Formula determines unknown parameter T4, i.e. annular fluid temperature.
Fig. 9 shows the realization of step 502 in the method for coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
Process, for ease of description, only parts related to embodiments of the present invention are shown, details are as follows:
In a further embodiment, as shown in figure 9, step 502, according to the energy quantitative change of annular fluid temperature and central tube
Change relationship determines central tube temperature, comprising:
Step 901, according to the energy variation of the axial heat conduction of central tube, radial heat transfer and central tube, central tube is determined
Energy variation relationship；
Step 902, the energy variation relationship based on central tube determines central tube temperature using annular fluid temperature.
In embodiments of the present invention, the energy variation relationship of central tube can be the energy variation equation of central tube, center
The energy variation equation of pipe refers to that the equation of reflection central tube energy variation, the energy variation equation of the central tube contain center
The energy variation of pipe.Specifically, when determining central tube temperature according to the energy variation relationship of central tube, it can be according to following
The energy variation equation of central tube determines central tube temperature:
And Δ T4=| T4-T5|；
Wherein, first item on the left of the energy variation equation of central tubeIndicate that the upward energy of center pipe axle passes
It passs, 2 π R of left side Section 21ΔT4Indicate central tube radially with the energy transmission of annular fluid, the energy variation equation of central tube
Right sideIndicate central tube itself energy variation, i.e., the upward energy transmission of center pipe axle and radially with ring
The energy transmission of empty fluid results in the energy variation of central tube itself jointly.
Wherein, ρmIndicate the density of fluid, unit kg/m3, CmIndicate that the specific heat capacity of fluid, unit are joule/(thousand
Gram degree), i.e. J/ (kgK), q indicate fluid flow in prefixed time interval t, z5Indicate that the axial grid of central tube is long
Degree, unit are rice (m), R1The thermal contact resistance of expression center pipe fluid and central tube tube wall, unit are (m DEG C)/W.T4Indicate ring
Empty fluid temperature (F.T.), T5Indicate central tube temperature, Δ T4The difference for indicating annular fluid temperature and central tube temperature, in an embodiment
In, Δ T4Indicate that the absolute value of the difference of annular fluid temperature and central tube temperature, t indicate prefixed time interval, unit h.
ρ in formulam、Cm、q、z5、R1、r1And t is known parameter, and unknown parameter T can be determined according to above formula5, i.e. central tube temperature.
Determining above-mentioned annular fluid temperature T4, central tube temperature T5And the difference of annular fluid temperature and central tube temperature
The absolute value delta T of value4Afterwards, thermal power relationship can be taken according to the coaxial type geothermal well in following, determines coaxial type geothermal well
Take thermal power (i.e. coaxial type underground heat well capacity):
Q=ρmCmqΔT4；
Wherein, Q indicates that coaxial type geothermal well takes thermal power, ρmIndicate the density of fluid, unit kg/m3, CmIndicate stream
The specific heat capacity of body, unit are joule/(kilogram degree), i.e. J/ (kgK), q indicate the fluid stream in prefixed time interval t
Amount, Δ T4Indicate the absolute value of the difference of annular fluid temperature and central tube temperature.
A kind of device of coaxial type geothermal well capability forecasting is additionally provided in the embodiment of the present invention, such as the following examples institute
It states.Since the principle that these devices solve the problems, such as is similar to the method for coaxial type geothermal well capability forecasting, these devices
Implementation may refer to the implementation of method, and overlaps will not be repeated.
Figure 10 shows the functional module of the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention, for just
In explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
With reference to Figure 10, the modules that the device of coaxial type geothermal well capability forecasting is included are corresponding real for executing Fig. 2
Each step in example is applied, referring specifically to the associated description in Fig. 2 and Fig. 2 corresponding embodiment, details are not described herein again.This hair
In bright embodiment, the device of coaxial type geothermal well capability forecasting includes bushing temperature determining module 1001, difference determining module
1002 and production capacity determining module 1003.
Described sleeve pipe temperature determination module 1001, for according in the energy variation relationship on stratum, coaxial type geothermal well
The energy variation relationship of cement sheath and casing determines bushing temperature；Coaxial type geothermal well from center outward successively include central tube,
Casing, cement sheath, cement sheath and stratum are adjacent, and annular fluid is between central tube and casing.
The difference determining module 1002, for according to bushing temperature and annular fluid, the energy variation relationship of central tube,
Determine the difference of annular fluid temperature Yu central tube temperature.
The production capacity determining module 1003 determines coaxial for the difference according to annular fluid temperature and central tube temperature
Type underground heat well capacity.
In embodiments of the present invention, bushing temperature determining module 1001 is according to the energy variation relationship on stratum, coaxial type
The energy variation relationship of cement sheath and casing in hot well determines bushing temperature, difference determining module 1002 according to bushing temperature and
Annular fluid, the energy variation relationship of central tube, determine the difference of annular fluid temperature Yu central tube temperature, production capacity determining module
1003, according to the difference of annular fluid temperature and central tube temperature, determine coaxial type underground heat well capacity.The embodiment of the present invention exists
When determining coaxial type underground heat well capacity, not only allow for the energy variation of coaxial type geothermal well itself, i.e., stratum, cement sheath,
The energy variation of casing and central tube, while also contemplating influence of the annular fluid to coaxial type geothermal well energy variation, i.e.,
The energy variation of annular fluid, thus it is more accurate express the energy variation of coaxial type geothermal well, and then can be improved same
The accuracy of spindle-type geothermal well capability forecasting.
The device middle sleeve temperature that Figure 11 shows coaxial type geothermal well capability forecasting provided in an embodiment of the present invention determines
The structural representation of module 1001, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 11, for executing, Fig. 3 is corresponding to be implemented each unit that described sleeve pipe temperature determination module 1001 is included
Each step in example, referring specifically to the associated description in Fig. 3 and Fig. 3 corresponding embodiment, details are not described herein again.The present invention
In embodiment, bushing temperature determining module 1001 includes formation temperature determination unit 1101, cement sheath temperature determining unit 1102
And bushing temperature determination unit 1103.
The formation temperature determination unit 1101, for determining formation temperature according to the energy variation relationship on stratum.
The cement sheath temperature determining unit 1102, for being determined according to the energy variation relationship of formation temperature and cement sheath
Cement sheath temperature.
Described sleeve pipe temperature determining unit 1103 is covered for being determined according to the energy variation relationship of cement sheath temperature and casing
Tube temperature degree.
The embodiment of the present invention, formation temperature determination unit 1101 determine formation temperature according to the energy variation relationship on stratum,
Cement sheath temperature determining unit 1102 determines cement sheath temperature according to the energy variation relationship of formation temperature and cement sheath, covers tube temperature
It spends determination unit 1103 and bushing temperature is determined according to the energy variation relationship of cement sheath temperature and casing, and coaxial type is determined with this
Underground heat well capacity can be further improved the accuracy of coaxial type geothermal well capability forecasting.
In a further embodiment, stratum includes anhydrous stratum or water breakthrough stratum.
In a further embodiment, the cement sheath in coaxial type geothermal well and anhydrous stratum are adjacent.Formation temperature determines
Unit 1101 includes that anhydrous formation temperature determines subelement.
The anhydrous formation temperature determines subelement, for determining anhydrous stratum according to the energy variation relationship on anhydrous stratum
Temperature.
Correspondingly, cement sheath temperature determining unit 1102, specifically for the energy according to anhydrous formation temperature and cement sheath
Variation relation determines cement sheath temperature.
In a further embodiment, the cement sheath in coaxial type geothermal well and water breakthrough stratum are adjacent.Formation temperature determines
Unit 1101 includes that water breakthrough formation temperature determines subelement.
The water breakthrough formation temperature determines subelement, for determining water breakthrough stratum according to the energy variation relationship on water breakthrough stratum
Temperature.
Correspondingly, cement sheath temperature determining unit 1102, specifically for the energy according to water breakthrough formation temperature and cement sheath
Variation relation determines cement sheath temperature.
Figure 12 shows difference determining module in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
1002 structural representation, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 12, each unit that the difference determining module 1002 is included is for executing in Fig. 5 corresponding embodiment
Each step, referring specifically to the associated description in Fig. 5 and Fig. 5 corresponding embodiment, details are not described herein again.The present invention is implemented
Example in, difference determining module 1002 include annular fluid temperature determining unit 1201, central tube temperature determining unit 1202 and
Difference determining unit 1203.
The annular fluid temperature determining unit 1201, for the energy variation relationship according to bushing temperature and annular fluid
Determine annular fluid temperature.
The central tube temperature determining unit 1202, for the energy variation relationship according to annular fluid temperature and central tube
Determine central tube temperature.
The Difference determining unit 1203, for determining annular fluid temperature according to annular fluid temperature and central tube temperature
With the difference of central tube temperature.
The embodiment of the present invention, annular fluid temperature determining unit 1201 is according to the energy variation of bushing temperature and annular fluid
Relationship determines annular fluid temperature, and central tube temperature determining unit 1202 is according to the energy variation of annular fluid temperature and central tube
Relationship determines central tube temperature, and Difference determining unit 1203 determines Annular cutting body temperature according to annular fluid temperature and central tube temperature
The difference of degree and central tube temperature, and based on the difference of annular fluid temperature and central tube temperature, determine coaxial type underground heat
Well capacity can be further improved the accuracy of coaxial type geothermal well capability forecasting.
It is true that Figure 13 shows cement sheath temperature in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural representation of order member 1102, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 13, each subelement that the cement sheath temperature determining unit 1102 is included is corresponding for executing Fig. 6
Each step in embodiment, referring specifically to the associated description in Fig. 6 and Fig. 6 corresponding embodiment, details are not described herein again.This
In inventive embodiments, cement sheath temperature determining unit 1102 includes that the first determining subelement 1301 and cement sheath temperature determine that son is single
Member 1302.
Described first determines subelement 1301, for according to the axial heat conduction of cement sheath, radial heat transfer and cement sheath
Energy variation determines the energy variation relationship of cement sheath.
The cement sheath temperature determines subelement 1302, for the energy variation relationship based on cement sheath, utilizes stratum temperature
It spends and determines cement sheath temperature.
The device middle sleeve temperature that Figure 14 shows coaxial type geothermal well capability forecasting provided in an embodiment of the present invention determines
The structural representation of unit 1103, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 14, each subelement that described sleeve pipe temperature determining unit 1103 is included is corresponding real for executing Fig. 7
Each step in example is applied, referring specifically to the associated description in Fig. 7 and Fig. 7 corresponding embodiment, details are not described herein again.This hair
In bright embodiment, bushing temperature determination unit 1103 includes that the second determining subelement 1401 and bushing temperature determine subelement
1402。
Described second determines subelement 1401, for the energy according to the axial heat conduction of casing, radial heat transfer and casing
Variation, determines the energy variation relationship of casing.
Described sleeve pipe temperature determines subelement 1402, for the energy variation relationship based on casing, utilizes cement sheath temperature
Determine bushing temperature.
Figure 15 shows annular space fluid temperature (F.T.) in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural representation of determination unit 1201, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 15, each subelement that the annular fluid temperature determining unit 1201 is included is for executing Fig. 8 pairs
Each step in embodiment is answered, referring specifically to the associated description in Fig. 8 and Fig. 8 corresponding embodiment, details are not described herein again.
In the embodiment of the present invention, annular fluid temperature determining unit 1201 includes that third determines that subelement 1501 and annular fluid temperature are true
Stator unit 1502.
The third determines subelement 1501, for the axial heat conduction, radial heat transfer and Annular cutting according to annular fluid
The energy variation of body determines the energy variation relationship of annular fluid.
The annular fluid temperature determines subelement 1502, for the energy variation relationship based on annular fluid, utilizes set
Tube temperature degree determines annular fluid temperature.
It is true that Figure 16 shows central tube temperature in the device of coaxial type geothermal well capability forecasting provided in an embodiment of the present invention
The structural representation of order member 1202, for purposes of illustration only, only parts related to embodiments of the present invention are shown, details are as follows:
With reference to Figure 16, each subelement that the central tube temperature determining unit 1202 is included is corresponding for executing Fig. 9
Each step in embodiment, referring specifically to the associated description in Fig. 9 and Fig. 9 corresponding embodiment, details are not described herein again.This
In inventive embodiments, central tube temperature determining unit 1202 includes that the 4th determining subelement 1601 and central tube temperature determine that son is single
Member 1602.
Described 4th determines subelement 1601, for according to the axial heat conduction of central tube, radial heat transfer and central tube
Energy variation determines the energy variation relationship of central tube.
The central tube temperature determines subelement 1602, for the energy variation relationship based on central tube, utilizes Annular cutting
Temperature determines central tube temperature.
The embodiment of the present invention also provides a kind of computer equipment, including memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, the processor realize above-mentioned coaxial type underground heat when executing the computer program
The method of well capacity prediction.
The embodiment of the present invention also provides a kind of computer readable storage medium, and the computer-readable recording medium storage has
Execute the computer program of the method for above-mentioned coaxial type geothermal well capability forecasting.
In conclusion the embodiment of the present invention according in the energy variation relationship on stratum, coaxial type geothermal well cement sheath and
The energy variation relationship of casing determines bushing temperature；Coaxial type geothermal well is from center outward successively including central tube, casing, cement
Ring, cement sheath and stratum are adjacent, and annular fluid is between central tube and casing, according to bushing temperature and annular fluid, center
The energy variation relationship of pipe, determines the difference of annular fluid temperature Yu central tube temperature, according to annular fluid temperature and central tube
The difference of temperature determines coaxial type underground heat well capacity.The embodiment of the present invention is when determining coaxial type underground heat well capacity, not only
The energy variation of coaxial type geothermal well itself, the i.e. energy variation of stratum, cement sheath, casing and central tube are considered, simultaneously
Also contemplate influence of the annular fluid to coaxial type geothermal well energy variation, the i.e. energy variation of annular fluid, thus more subject to
True expresses the energy variation of coaxial type geothermal well, and then the accuracy of coaxial type geothermal well capability forecasting can be improved.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (11)
1. a kind of method of coaxial type geothermal well capability forecasting characterized by comprising
Casing is determined according to the energy variation relationship of cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Temperature；Coaxial type geothermal well successively includes central tube, casing, cement sheath from center outward, and cement sheath and stratum are adjacent, Annular cutting
Body is between central tube and casing；
According to bushing temperature and annular fluid, the energy variation relationship of central tube, annular fluid temperature and central tube temperature are determined
Difference；
According to the difference of annular fluid temperature and central tube temperature, coaxial type underground heat well capacity is determined.
2. the method as described in claim 1, which is characterized in that according in the energy variation relationship on stratum, coaxial type geothermal well
Cement sheath and the energy variation relationship of casing determine bushing temperature, comprising:
Formation temperature is determined according to the energy variation relationship on stratum；
Cement sheath temperature is determined according to the energy variation relationship of formation temperature and cement sheath；
Bushing temperature is determined according to the energy variation relationship of cement sheath temperature and casing.
3. method according to claim 2, which is characterized in that stratum includes anhydrous stratum or water breakthrough stratum, according to stratum
Energy variation relationship determines formation temperature, comprising:
Anhydrous formation temperature is determined according to the energy variation relationship on anhydrous stratum；Or
Water breakthrough formation temperature is determined according to the energy variation relationship on water breakthrough stratum；
Cement sheath temperature is determined according to the energy variation relationship of formation temperature and cement sheath, comprising:
Cement sheath temperature is determined according to the energy variation relationship of anhydrous formation temperature and cement sheath；Or
Cement sheath temperature is determined according to the energy variation relationship of water breakthrough formation temperature and cement sheath.
4. the method as described in claim 1, which is characterized in that according to the energy quantitative change of bushing temperature and annular fluid, central tube
Change relationship determines the difference of annular fluid temperature Yu central tube temperature, comprising:
Annular fluid temperature is determined according to the energy variation relationship of bushing temperature and annular fluid；
Central tube temperature is determined according to the energy variation relationship of annular fluid temperature and central tube；
The difference of annular fluid temperature and central tube temperature is determined according to annular fluid temperature and central tube temperature.
5. method according to claim 2, which is characterized in that determined according to the energy variation relationship of formation temperature and cement sheath
Cement sheath temperature, comprising:
According to the energy variation of the axial heat conduction of cement sheath, radial heat transfer and cement sheath, determine that the energy variation of cement sheath is closed
System；
Energy variation relationship based on cement sheath determines cement sheath temperature using formation temperature.
6. method according to claim 2, which is characterized in that determined according to cement sheath temperature and the energy variation relationship of casing
Bushing temperature, comprising:
According to the energy variation of the axial heat conduction of casing, radial heat transfer and casing, the energy variation relationship of casing is determined；
Energy variation relationship based on casing determines bushing temperature using cement sheath temperature.
7. method as claimed in claim 4, which is characterized in that the energy variation relationship according to bushing temperature and annular fluid is true
Determine annular fluid temperature, comprising:
According to the energy variation of the axial heat conduction of annular fluid, radial heat transfer and annular fluid, the energy of annular fluid is determined
Variation relation；
Energy variation relationship based on annular fluid determines annular fluid temperature using bushing temperature.
8. method as claimed in claim 4, which is characterized in that according to the energy variation relationship of annular fluid temperature and central tube
Determine central tube temperature, comprising:
According to the energy variation of the axial heat conduction of central tube, radial heat transfer and central tube, determine that the energy variation of central tube is closed
System；
Energy variation relationship based on central tube determines central tube temperature using annular fluid temperature.
9. a kind of device of coaxial type geothermal well capability forecasting characterized by comprising
Bushing temperature determining module, for according to the cement sheath and casing in the energy variation relationship on stratum, coaxial type geothermal well
Energy variation relationship determine bushing temperature；Coaxial type geothermal well from center outward successively include central tube, casing, cement sheath,
Cement sheath and stratum are adjacent, and annular fluid is between central tube and casing；
Difference determining module, for determining annular fluid according to bushing temperature and annular fluid, the energy variation relationship of central tube
The difference of temperature and central tube temperature；
Production capacity determining module determines the production of coaxial type geothermal well for the difference according to annular fluid temperature and central tube temperature
Energy.
10. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any side of claim 1 to 8 when executing the computer program
Method.
11. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has perform claim
It is required that the computer program of 1 to 8 any the method.
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| CN201811471774.7A Pending CN109653731A (en) | 2018-12-04 | 2018-12-04 | The method and device of coaxial type geothermal well capability forecasting |
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Application publication date: 20190419 |