CN106761602B - Method and device for determining production conditions of oil well - Google Patents
Method and device for determining production conditions of oil well Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 84
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The embodiment of the application provides a method and a device for determining the production condition of an oil well, wherein the method comprises the following steps: determining a dynamic control chart of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure; acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer; determining the area of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well; and determining the production condition of each single well according to the area of each single well in the dynamic control map. The embodiment of the application can realize the identification of the production working condition of the oil well, thereby providing a reference basis for subsequent production adjustment and further being beneficial to improving the system efficiency and the yield of the oil well.
Description
Technical Field
The application relates to the technical field of oil reservoir exploitation, in particular to a method and a device for determining the production condition of an oil well.
Background
In oil reservoir exploitation, the pump efficiency is a parameter reflecting the oil extraction capacity of an oil well oil pump (hereinafter referred to as an oil pump for short), and under the condition that the theoretical displacement of the oil pump is the same, the higher the pump efficiency is, the higher the liquid volume is, and otherwise, the lower the liquid volume is. Therefore, it is generally required that the oil well pump should have a high pumping efficiency.
In actual production, due to the influence of various factors, the actual pump efficiency may not meet the requirement, thereby affecting the productivity. In particular, for reservoir blocks in the middle and later recovery periods, productivity is generally low. However, the lower production is caused by the lack of knowledge of the production conditions of the well, in addition to the reduced amount of fluid available for production from the formation itself. Therefore, a technical scheme capable of identifying the production condition of the oil well needs to be found out at present to provide a basis for adjusting the production of the oil well.
Disclosure of Invention
The embodiment of the application aims to provide a method and a device for determining the production working condition of an oil well so as to realize the identification of the production working condition of the oil well.
In order to achieve the above object, in one aspect, the embodiments of the present application provide a method for determining production conditions of an oil well, including the following steps:
determining a dynamic control chart of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure;
acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer;
determining the area of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well;
and determining the production condition of each single well according to the area of each single well in the dynamic control map.
The method for determining the production condition of the oil well comprises the following steps of:
determining an average theoretical pump efficiency curve of the oil layer according to the average value of the specific attribute parameters of the oil layer and a preset theoretical pump efficiency calculation formula;
determining a theoretical pump efficiency upper limit curve of the oil layer according to the specific attribute parameter upper limit value of the oil layer and the theoretical pump efficiency calculation formula;
determining a theoretical pump efficiency lower limit curve of the oil layer according to the specific attribute parameter lower limit value of the oil layer and the theoretical pump efficiency calculation formula;
determining a self-jetting pressure lower limit curve of the oil layer according to the self-jetting pressure lower limit value of the oil layer;
determining a reference pump efficiency lower limit curve of the oil layer;
determining a liquid supply capacity curve of the oil layer;
determining a breaking and dropping loss curve of the oil layer;
and drawing the average theoretical pump efficiency curve, the theoretical pump efficiency upper limit curve, the theoretical pump efficiency lower limit curve, the self-injection flow pressure lower limit curve, the reference pump efficiency lower limit curve, the liquid supply capacity curve and the break-and-lose curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes to form a dynamic control chart of the oil layer.
According to the method for determining the production condition of the oil well, the specific attribute parameters of the oil layer comprise:
water saturation rate, dissolved oil-gas ratio corresponding to suction inlet pressure of oil-well pump, volume coefficient corresponding to sinking pressure, stroke loss of oil-well pump, stroke frequency of oil-well pump, flow pressure, wellhead pressure, pump section pressure and well depth.
In the method for determining the production condition of the oil well according to the embodiment of the application, the theoretical pump efficiency calculation formula comprises the following steps:
η'＝η1*η2*η3*η4*η5wherein, in the step (A),
η' is the theoretical pump efficiency;
η1η for free gas affected Pump efficiency1＝1/(1+((1-FW)*(33-Rg))*bg)；
η2For pumping efficiency under the influence of expansion of the clearance gas, η2＝(S-(0.5*(1-FW)*(33-(2.71*Rg))*bg)/S；
η3η for the pump efficiency under the influence of elastic expansion and contraction of oil pipe and sucker rod3＝(S-Lmt)/S，Lmt＝((980*9.8*L*0.000001-(Pf-Pd))*L*fp*0.22)/206000；
η4η for Pump Effect under the influence of solution gas4＝FW+(1-FW)/0.998；
η5η for the pump efficiency under the influence of the pump barrel and valve loss5＝0.96；
Wherein, FWIs the water saturation ratio, RgDissolved oil-gas ratio corresponding to suction inlet pressure of oil well pump, bgVolume factor, L, corresponding to the submergence pressuremtIs the stroke loss of the oil pump, S is the stroke frequency of the oil pump, PfIs fluid pressure, PdFor well head pressure, fpIs the pump cross-sectional pressure, and L is the well depth.
The method for determining the production condition of the oil well in the embodiment of the application, the step of obtaining the pump efficiency of each single well corresponding to the oil layer comprises the following steps:
according to the formula
Obtaining a pump efficiency of each single well corresponding to the oil layer;
η represents the pump efficiency of the oil pump of a single well, Q represents the daily liquid production of the single well, S represents the stroke of the oil pump of the single well, N represents the stroke frequency of the oil pump of the single well, and D represents the pump diameter of the oil pump of the single well.
The method for determining the production condition of the oil well in the embodiment of the application, which is used for acquiring the flow pressure of each single well corresponding to the oil layer, comprises the following steps:
according to formula Pf＝Pc+(H1-H2)×(0.08+0.02×FW) X 0.0980665 obtaining the pump efficiency of each single well corresponding to the oil layer;
wherein, PfThe flow pressure, P, of the oil reservoir corresponding to the single-well oil-well pumpcCasing pressure for a single well, H1The middle depth H of the oil layer corresponding to the single-well oil pump2Working fluid level depth of a single well, FWThe water content of the oil layer corresponding to the single-well oil pump.
On the other hand, this application embodiment still provides a device of confirming oil well production operating mode, includes:
the control map determining module is used for determining a dynamic control map of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure;
the single-well information acquisition module is used for acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer;
the single well position determining module is used for determining the area of each single well in the dynamic control map according to the pump efficiency and the flow pressure of each single well;
and the single well working condition determining module is used for determining the production working condition of each single well according to the area of each single well in the dynamic control map.
The device of the definite oil well production operating mode of this application embodiment, the control chart confirms the module, includes:
the first curve acquisition submodule is used for determining an average theoretical pump efficiency curve of the oil layer according to the specific attribute parameter average value of the oil layer and a preset theoretical pump efficiency calculation formula;
the second curve acquisition submodule is used for determining a theoretical pump efficiency upper limit curve of the oil layer according to the specific attribute parameter upper limit value of the oil layer and the theoretical pump efficiency calculation formula;
the third curve acquisition submodule is used for determining a theoretical pump efficiency lower limit curve of the oil layer according to the specific attribute parameter lower limit value of the oil layer and the theoretical pump efficiency calculation formula;
the fourth curve acquisition submodule is used for determining a self-injection pressure lower limit curve of the oil layer according to the self-injection pressure lower limit value of the oil layer;
a fifth curve acquisition submodule for determining a reference pump efficiency lower limit curve of the oil layer;
the sixth curve acquisition submodule is used for determining a liquid supply capacity curve of the oil layer;
a seventh curve acquisition submodule for determining a break-and-break leakage curve of the oil layer;
and the dynamic control chart constructing submodule is used for drawing an average theoretical pump efficiency curve, a theoretical pump efficiency upper limit curve, a theoretical pump efficiency lower limit curve, a self-injection flow pressure lower limit curve, a reference pump efficiency lower limit curve, a liquid supply capacity curve and a break-and-lose curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes to form a dynamic control chart of the oil layer.
The device of the definite oil well production operating mode of this application embodiment, the specific attribute parameter of oil reservoir includes:
water saturation rate, dissolved oil-gas ratio corresponding to suction inlet pressure of oil-well pump, volume coefficient corresponding to sinking pressure, stroke loss of oil-well pump, stroke frequency of oil-well pump, flow pressure, wellhead pressure, pump section pressure and well depth.
The device of the definite oil well production operating mode of this application embodiment, theoretical pump efficiency computational formula includes:
η'＝η1*η2*η3*η4*η5wherein, in the step (A),
η' is the theoretical pump efficiency;
η1η for free gas affected Pump efficiency1＝1/(1+((1-FW)*(33-Rg))*bg)；
η2For pumping efficiency under the influence of expansion of the clearance gas, η2＝(S-(0.5*(1-FW)*(33-(2.71*Rg))*bg)/S；
η3η for the pump efficiency under the influence of elastic expansion and contraction of oil pipe and sucker rod3＝(S-Lmt)/S，Lmt＝((980*9.8*L*0.000001-(Pf-Pd))*L*fp*0.22)/206000；
η4η for Pump Effect under the influence of solution gas4＝FW+(1-FW)/0.998；
η5η for the pump efficiency under the influence of the pump barrel and valve loss5＝0.96；
Wherein, FWIs the water saturation ratio, RgDissolved oil-gas ratio corresponding to suction inlet pressure of oil well pump, bgVolume factor, L, corresponding to the submergence pressuremtIs the stroke loss of the oil pump, S is the stroke frequency of the oil pump, PfIs fluid pressure, PdFor well head pressure, fpIs the pump cross-sectional pressure, and L is the well depth.
The device for determining production conditions of the oil well comprises a single-well information acquisition module, a data acquisition module and a data processing module, wherein the single-well information acquisition module is specifically used for acquiring data according to a formula
Obtaining a pump efficiency of each single well corresponding to the oil layer;
η represents the pump efficiency of the oil pump of a single well, Q represents the daily liquid production of the single well, S represents the stroke of the oil pump of the single well, N represents the stroke frequency of the oil pump of the single well, and D represents the pump diameter of the oil pump of the single well.
Device for determining production condition of oil well in embodiment of applicationThe single-well information acquisition module is specifically used for obtaining the formula Pf＝Pc+(H1-H2)×(0.08+0.02×FW) X 0.0980665 obtaining the pump efficiency of each single well corresponding to the oil layer;
wherein, PfThe flow pressure, P, of the oil reservoir corresponding to the single-well oil-well pumpcCasing pressure for a single well, H1The middle depth H of the oil layer corresponding to the single-well oil pump2Working fluid level depth of a single well, FWThe water content of the oil layer corresponding to the single-well oil pump.
According to the technical scheme provided by the embodiment of the application, after the dynamic control chart of the oil layer is determined, the pump efficiency and the flow pressure of each single well corresponding to the oil layer are obtained; then determining the region of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well; because each area in the dynamic control chart corresponds to one production working condition, the production working condition of each single well can be determined according to the area of each single well in the dynamic control chart, namely, the identification of the production working condition of the oil well is realized, so that a reference basis can be provided for subsequent production adjustment, and the system efficiency and the yield of the oil well can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort. In the drawings:
FIG. 1 is a flow chart of a method of determining well production conditions according to an embodiment of the present application;
FIG. 2 is a dynamic control chart determined in an embodiment of the present application;
FIG. 3 is a schematic illustration of the zones of a plurality of individual wells in a dynamic control map according to an embodiment of the present application;
FIG. 4 is a block diagram of an apparatus for determining well production conditions according to an embodiment of the present application;
fig. 5 is a block diagram illustrating a structure of a control map determining module according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventors of the present application often found out over a long period of research that: generally, when an oil well pump works normally, the pumping efficiency of an oil pumping pipe column is mainly influenced by free gas, dissolved gas, clearance loss, stroke loss, pump barrel leakage and valve leakage under a sealed condition. These factors are in turn related to the submergence pressure, i.e. the higher the submergence pressure the less the effect on the pumping efficiency. Therefore, under the condition that the pump depth is certain, the higher the sinking pressure is, the higher the flow pressure is; the lower the reverse. Thus, a dependency relationship between the pump efficiency and the flow pressure is formed: the higher the flow pressure is, the higher the pumping efficiency is; the lower the flow pressure, the lower the pumping efficiency. The flow pressure and the pump efficiency can reflect the working condition (namely the production dynamic) of the oil well from respective angles. When the flow pressure is too high, the amount of liquid flowing into the bottom of the well (i.e., the amount of liquid provided by the formation) is greater than the capacity of the amount of liquid removed (i.e., the amount of liquid produced by the well), whereas when the flow pressure is too low, the amount of liquid flowing into the bottom of the well is less than the capacity of the amount of liquid removed. That is, the flow pressure can reflect the liquid supply state, the pump efficiency can reflect the liquid discharge state, and the combination of the two can reflect the coordination relation of supply and discharge. Different flow pressures should have corresponding pumping requirements. If only high pumping efficiency is pursued, the sinking pressure is higher, and the flowing pressure is correspondingly higher, so that the oil supply capacity of the stratum is limited; if the maximum production capacity of the oil layer is simply sought, the low flow pressure drop inevitably leads to low pumping efficiency.
Based on the above principle, the embodiment of the present application provides a method for determining the production condition of an oil well, which is shown with reference to fig. 1 and comprises the following steps:
and S101, determining a dynamic control chart of the oil layer.
In the embodiment of the application, the dynamic control chart is obtained by drawing a relevant curve reflecting the coordination relationship between the pump effect and the flow pressure in the same rectangular coordinate system with the flow pressure and the pump effect as coordinate axes. The dynamic control chart is favorable for visually determining the production working condition of the oil well, and is very convenient. In an embodiment of the present application, the determining a dynamic control map of an oil layer may specifically include:
and determining an average theoretical pump efficiency curve of the oil layer according to the average value of the specific attribute parameters of the oil layer and a preset theoretical pump efficiency calculation formula, as shown by L4 in FIG. 2.
And determining a theoretical upper pumping efficiency limit curve of the oil layer according to the upper limit value of the specific attribute parameter of the oil layer and the theoretical upper pumping efficiency calculation formula, as shown by L6 in FIG. 2.
And determining a theoretical pump efficiency lower limit curve of the oil layer according to the specific attribute parameter lower limit value of the oil layer and the theoretical pump efficiency calculation formula, as shown by L3 in FIG. 2.
And determining a self-injection pressure lower limit curve of the oil layer according to the self-injection pressure lower limit value of the oil layer, as shown by L7 in FIG. 2.
Determining a reference pump efficiency lower limit curve of the oil layer; the reference pump efficiency lower limit curve is a reasonable pump efficiency lower limit curve; specifically, areas with insufficient liquid supply and serious gas images can be found out in a statistical mode according to indicator diagrams and working fluid level data of oil layers, and therefore a reasonable pumping value is preliminarily obtained according to experience. From the use of the oil pumping equipment, a reasonable pumping effective value can be determined by ensuring that the oil well pump has a high filling coefficient and considering the influence of stroke loss, leakage and the like. By analyzing the two pump efficiency values together, a reference lower pump efficiency limit curve of the present oil layer is determined, as shown by L2 in fig. 2.
Determining a liquid supply capacity curve of the oil layer; the liquid supply capacity curve can be obtained by statistically finding out the regions of insufficient liquid supply and severe gas images according to the indicator diagram and the working fluid level data of the oil layer, so as to empirically determine a liquid pressure value of a liquid supply capacity limit, and determine the liquid supply capacity curve of the oil layer according to the liquid pressure value, as shown by L1 in fig. 2.
Determining a breaking and dropping loss curve of the oil layer; the breaking-and-dropping-loss curve can be used for statistically analyzing all pumping wells with the flow pressure higher than the flowing pressure according to an indicator diagram and working fluid level data of an oil layer, and determining the pumping efficiency limits of a normal well and an abnormal well according to experience, so that a pumping efficiency value is determined according to the average pumping efficiency of all normal wells, as shown by L5 in figure 2.
And drawing the average theoretical pump efficiency curve, the theoretical pump efficiency upper limit curve, the theoretical pump efficiency lower limit curve, the self-injection flow pressure lower limit curve, the reference pump efficiency lower limit curve, the liquid supply capacity curve and the break-and-lose curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes to form a dynamic control chart of the oil layer.
As shown in fig. 2, the whole dynamic control map is divided into a reasonable area a, an area b to be implemented, a parameter partial small area c, a parameter partial large area d and an off-leakage area e by the curves. Wherein:
a reasonable area a: in the area with well coordinated flow pressure and pump efficiency, the liquid supply capacity of the oil layer is matched with the liquid discharge capacity of the oil well pump, namely the production working condition of the oil well pump of the oil well in the area is reasonable, and therefore the area is positioned as a reasonable area.
And b, a to-be-implemented area b: in the area with low flow pressure and high pump efficiency, especially when the theoretical pump efficiency of an oil layer is exceeded, uncertainty exists in the area, and the theory can be determined only by implementation.
Parameter bias cell c: in the area with high flow pressure and high pump efficiency, because the oil well pump in the area works well and only the parameters are slightly smaller, the liquid supply capacity of the oil layer is larger than the liquid discharge capacity of the oil well pump, if the parameters are increased properly, the industrial quantity can be improved, and therefore the parameter bias area c has potential to be dug.
Parameter partial area d: in areas of low pressure, low pumping, wells that accumulate often exhibit inadequate liquid supply or are affected by gas. A low flow pressure indicates a deviation in the supply capacity, while a low pumping efficiency is generally due to an insufficient sink pressure, which is generally due to an excessive pump displacement, and thus this region is located as a parameter bias region.
Breaking and dropping loss area e: distributed wells in areas of high flow and low pumping efficiency are often characterized by pump failure (break-out or loss). Since the high flow rate, the sink pressure is necessarily high, and the main cause of low pump efficiency is typically pump failure or tubing loss, this region is therefore located as a breakout leak-off zone.
In the embodiment of the present application, the determining of the order of each curve is not sequential, and may be completed in any order, or may be performed simultaneously.
In the embodiment of the application, the corresponding dynamic control map can be determined for each oil layer of each block in the work area, so that the production condition of the oil well corresponding to the oil layer (namely the production condition of the oil well pump) can be determined according to the corresponding dynamic control map of the oil layer.
In this embodiment, the specific property parameters of the oil layer may include, for example: water saturation rate, dissolved oil-gas ratio corresponding to suction inlet pressure of oil-well pump, volume coefficient corresponding to sinking pressure, stroke loss of oil-well pump, stroke frequency of oil-well pump, flow pressure, wellhead pressure, pump section pressure and well depth.
In the embodiment of the present application, the theoretical pump efficiency calculation formula includes:
η'＝η1*η2*η3*η4*η5wherein, in the step (A),
η' is the theoretical pump efficiency;
η1for the pumping efficiency under the influence of the free gas (namely, the filling coefficient of the oil well pump only under the influence of the free gas),
η1＝1/(1+((1-FW)*(33-Rg))*bg)；
η2for pumping efficiency under the influence of expansion of the clearance gas (i.e. filling of the pump when reducing the effective stroke of the piston only by taking account of expansion of the clearance gas)Coefficient), η2＝(S-(0.5*(1-FW)*(33-(2.71*Rg))*bg)/S；
η3For the pump efficiency under the influence of the elastic expansion of the oil pipe and the sucker rod (namely only considering the stroke efficiency of the oil pump when the stroke loss is generated by the elastic expansion of the oil pipe and the sucker rod),
η3＝(S-Lmt)/S，Lmt＝((980*9.8*L*0.000001-(Pf-Pd))*L*fp*0.22)/206000；
η4η for pump efficiency under the influence of solution gas (i.e. the fill factor of the pump when only solution gas is considered), its design is4＝FW+(1-FW)/0.998；
η5η for the pump efficiency under the influence of the pump barrel and the valve loss (i.e. the filling factor of the oil-well pump only considering the influence of the pump barrel and the valve loss), respectively5＝0.96；
Wherein, FWIs the water saturation ratio, RgDissolved oil-gas ratio corresponding to suction inlet pressure of oil well pump, bgVolume factor, L, corresponding to the submergence pressuremtIs the stroke loss of the oil pump, S is the stroke frequency of the oil pump, PfIs fluid pressure, PdFor well head pressure, fpIs the pump cross-sectional pressure, and L is the well depth.
And S102, acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer.
In the embodiment of the present application, the pump efficiency and the flow pressure of each single well refer to the actual pump efficiency and the actual flow pressure of each single well.
In the embodiment of the application, the formula can be used
Obtaining a pump efficiency of each single well corresponding to the oil layer;
η represents the pump efficiency of the oil pump of a single well, Q represents the daily liquid production of the single well, S represents the stroke of the oil pump of the single well, N represents the stroke frequency of the oil pump of the single well, and D represents the pump diameter of the oil pump of the single well.
In the embodiment of the present application, the formula P can be usedf＝Pc+(H1-H2)×(0.08+0.02×FW) X 0.0980665 obtaining the pump efficiency of each single well corresponding to the oil layer;
wherein, PfThe flow pressure, P, of the oil reservoir corresponding to the single-well oil-well pumpcCasing pressure for a single well, H1The middle depth H of the oil layer corresponding to the single-well oil pump2Working fluid level depth of a single well, FWThe water content of the oil layer corresponding to the single-well oil pump.
S103, determining the area of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well.
In the embodiment of the application, after the pump efficiency and the flow pressure of a single well are determined, the position of the single well on the dynamic control chart taking the pump efficiency and the flow pressure as coordinates is determined. For example, as shown in fig. 3, there are 4 wells in the reservoir: well number 01, well number 02, well number 03, and well number 04; wherein it is determined by calculation: the pumping efficiency of the No. 01 well is 40 percent, and the flow pressure is 2.5 Mpa; the pump efficiency of the No. 02 well is 55 percent, and the flow pressure is 3 Mpa; the pump efficiency of the No. 03 well is 60 percent, and the flow pressure is 5.5 Mpa; the pumping efficiency of well No. 04 is 30%, and the flow pressure is 3 MPa. It can then be determined that well 01, well 02 and well 03 are within the reasonable area a of the dynamic control map; and well number 04 is located in greater parameter zone d.
And S104, determining the production condition of each single well according to the area of each single well in the dynamic control map.
In the embodiment of the application, after the area of one single well in the dynamic control map is determined, the property of the area is determined, so that the production condition of each single well can be correspondingly determined according to the property of the area. Specifically, the method comprises the following steps:
(1) if the single well is located in the reasonable area, the pump efficiency of the oil well pump of the single well is coordinated with the liquid supply capacity of the oil layer, the production working condition is good, the system efficiency is high, and normal production can be continuously kept.
(2) And if the single well is positioned in the area to be implemented, the flow pressure of the single well is low, the pumping efficiency is high, and theoretically, the single well should not be used. Because a single well in the area to be implemented may have a pumping phenomenon, relevant data (such as whether the inspection process, oil measuring equipment, measuring instruments and the like have problems, whether the working fluid level is accurately measured or not and the like) needs to be checked. The conditions of the single well can be shifted to a reasonable area, typically after verification and elimination of the image factor.
(3) And if the single well is positioned in the parameter deviation cell, the flow pressure of the single well is high, and the pump efficiency is high. Therefore, the single well is used as an object for amplifying differential pressure production, and after the production condition of the single well is achieved, the production requirement can be met by increasing the single well industry quantity through properly adjusting relevant parameters (such as stroke times and the like).
(4) If the single well is located in the area with larger parameters, the flow pressure of the single well is low, and the pump efficiency is also low. Reflecting insufficient liquid supply or severe gas effects of the single well. Therefore, whether the single well is at the end of development (for example, whether sand production phenomenon exists in the discharged liquid) is considered, and if the single well is confirmed to be at the end of development, the single well can reach production balance by considering measures such as reduction of stroke number and reduction of pumping parameters.
(5) And if the single well is positioned in the breaking and leakage area, the well flow rate of the single well is high, and the pump efficiency is low. In this case, the corresponding indicator diagram generally shows the phenomena of wax deposition, sand blocking, breaking, leakage and the like. Therefore, it is necessary to perform liquid level diagnosis and comprehensive analysis to find out the problem, so as to take corresponding measures to restore the normal production.
While the process flows described above include operations that occur in a particular order, it should be appreciated that the processes may include more or less operations that are performed sequentially or in parallel (e.g., using parallel processors or a multi-threaded environment).
According to the embodiment of the application, after the dynamic control chart of the oil layer is determined, the pump efficiency and the flow pressure of each single well corresponding to the oil layer are obtained; then determining the region of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well; because each area in the dynamic control chart corresponds to one production working condition, the production working condition of each single well can be determined according to the area of each single well in the dynamic control chart, namely, the identification of the production working condition of the oil well is realized, so that a reference basis can be provided for subsequent production adjustment, and the system efficiency and the yield of the oil well can be improved.
Referring to fig. 4, the apparatus for determining the production condition of the oil well according to the embodiment of the present application may include:
a control map determination module 41 for determining a dynamic control map of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure;
a single well information obtaining module 42, configured to obtain a pump efficiency and a flow pressure of each single well corresponding to the oil layer;
a single well position determination module 43, configured to determine, according to the pumping efficiency and the flow pressure of each single well, a region to which each single well belongs in the dynamic control map;
and the single well working condition determining module 44 is used for determining the production working condition of each single well according to the area of each single well in the dynamic control map.
Referring to fig. 5, the control chart determining module 41 may further include:
the first curve obtaining sub-module 411 is configured to determine an average theoretical pump efficiency curve of the oil layer according to the average value of the specific attribute parameter of the oil layer and a preset theoretical pump efficiency calculation formula;
a second curve obtaining submodule 412, configured to determine a theoretical upper limit pump efficiency curve of the oil layer according to the upper limit value of the specific attribute parameter of the oil layer and the theoretical pump efficiency calculation formula;
a third curve obtaining submodule 413, configured to determine a theoretical pump efficiency lower limit curve of the oil layer according to the lower limit of the specific attribute parameter of the oil layer and the theoretical pump efficiency calculation formula;
a fourth curve obtaining submodule 414, configured to determine a self-injection pressure lower limit curve of the oil layer according to the self-injection pressure lower limit value of the oil layer;
a fifth curve obtaining submodule 415, configured to determine a reference pump efficiency lower limit curve of the oil layer;
a sixth curve obtaining submodule 416, configured to determine a liquid supply capacity curve of the oil reservoir;
a seventh curve acquisition submodule 417, configured to determine a leakage-break curve of the oil layer;
and a dynamic control chart constructing submodule 418, configured to draw the average theoretical pump efficiency curve, the theoretical pump efficiency upper limit curve, the theoretical pump efficiency lower limit curve, the self-injection flow pressure lower limit curve, the reference pump efficiency lower limit curve, the liquid supply capacity curve, and the fluid loss and fluid loss interruption curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes, so as to form a dynamic control chart of the oil layer.
The apparatus for determining the production condition of the oil well in the embodiment of the present application corresponds to the method in the embodiment of fig. 1, and therefore, for details about the apparatus for determining the production condition of the oil well in the embodiment of the present application, please refer to the method in the embodiment of fig. 1, which is not described herein again.
According to the embodiment of the application, after the dynamic control chart of the oil layer is determined, the pump efficiency and the flow pressure of each single well corresponding to the oil layer are obtained; then determining the region of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well; because each area in the dynamic control chart corresponds to one production working condition, the production working condition of each single well can be determined according to the area of each single well in the dynamic control chart, namely, the identification of the production working condition of the oil well is realized, so that a reference basis can be provided for subsequent production adjustment, and the system efficiency and the yield of the oil well can be improved.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations as the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of determining the production regime of an oil well, comprising the steps of:
determining a dynamic control chart of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure;
acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer;
determining the area of each single well in the dynamic control chart according to the pump efficiency and the flow pressure of each single well;
determining the production condition of each single well according to the area of each single well in the dynamic control map; wherein the content of the first and second substances,
the dynamic control chart for determining the oil layer comprises the following steps:
determining an average theoretical pump efficiency curve of the oil layer according to the average value of the specific attribute parameters of the oil layer and a preset theoretical pump efficiency calculation formula;
determining a theoretical pump efficiency upper limit curve of the oil layer according to the specific attribute parameter upper limit value of the oil layer and the theoretical pump efficiency calculation formula;
determining a theoretical pump efficiency lower limit curve of the oil layer according to the specific attribute parameter lower limit value of the oil layer and the theoretical pump efficiency calculation formula;
determining a self-jetting pressure lower limit curve of the oil layer according to the self-jetting pressure lower limit value of the oil layer;
determining a reference pump efficiency lower limit curve of the oil layer;
determining a liquid supply capacity curve of the oil layer;
determining a breaking and dropping loss curve of the oil layer;
and drawing the average theoretical pump efficiency curve, the theoretical pump efficiency upper limit curve, the theoretical pump efficiency lower limit curve, the self-injection flow pressure lower limit curve, the reference pump efficiency lower limit curve, the liquid supply capacity curve and the break-and-lose curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes to form a dynamic control chart of the oil layer.
2. A method of determining well production conditions according to claim 1, characterized in that said reservoir specific property parameters comprise:
water saturation rate, dissolved oil-gas ratio corresponding to suction inlet pressure of oil-well pump, volume coefficient corresponding to sinking pressure, stroke loss of oil-well pump, stroke frequency of oil-well pump, flow pressure, wellhead pressure, pump section pressure and well depth.
3. A method of determining well production conditions as claimed in claim 1 wherein said theoretical pump efficiency calculation formula comprises:
η'＝η1*η2*η3*η4*η5wherein, in the step (A),
η' is the theoretical pump efficiency;
η1η for free gas affected Pump efficiency1＝1/(1+((1-FW)*(33-Rg))*bg)；
η2For pumping efficiency under the influence of expansion of the clearance gas, η2＝(S-(0.5*(1-FW)*(33-(2.71*Rg))*bg)/S；
η3η for the pump efficiency under the influence of elastic expansion and contraction of oil pipe and sucker rod3＝(S-Lmt)/S，Lmt＝((980*9.8*L*0.000001-(Pf-Pd))*L*fp*0.22)/206000；
η4η for Pump Effect under the influence of solution gas4＝FW+(1-FW)/0.998；
η5η for the pump efficiency under the influence of the pump barrel and valve loss5＝0.96；
Wherein, FWIs the water saturation ratio, RgDissolved oil-gas ratio corresponding to suction inlet pressure of oil well pump, bgVolume factor, L, corresponding to the submergence pressuremtIs the stroke loss of the oil pump, S is the stroke frequency of the oil pump, PfIs fluid pressure, PdFor well head pressure, fpIs the pump cross-sectional pressure, and L is the well depth.
4. The method of determining well production conditions of claim 1, wherein said obtaining a pumping efficiency for each individual well corresponding to said reservoir comprises:
according to the formulaObtaining a pump efficiency of each single well corresponding to the oil layer;
η represents the pump efficiency of the oil pump of a single well, Q represents the daily liquid production of the single well, S represents the stroke of the oil pump of the single well, N represents the stroke frequency of the oil pump of the single well, and D represents the pump diameter of the oil pump of the single well.
5. The method of determining well production conditions of claim 1, wherein said obtaining a flow pressure for each individual well corresponding to said reservoir comprises:
according to formula Pf＝Pc+(H1-H2)×(0.08+0.02×FW) X 0.0980665 obtaining the pump efficiency of each single well corresponding to the oil layer;
wherein, PfThe flow pressure, P, of the oil reservoir corresponding to the single-well oil-well pumpcCasing pressure for a single well, H1The middle depth H of the oil layer corresponding to the single-well oil pump2Working fluid level depth of a single well, FWThe water content of the oil layer corresponding to the single-well oil pump.
6. An apparatus for determining production conditions for an oil well, comprising:
the control map determining module is used for determining a dynamic control map of the oil layer; each region in the dynamic control chart reflects the coordination relation between the corresponding pump effect and the flow pressure;
the single-well information acquisition module is used for acquiring the pump efficiency and the flow pressure of each single well corresponding to the oil layer;
the single well position determining module is used for determining the area of each single well in the dynamic control map according to the pump efficiency and the flow pressure of each single well;
the single well working condition determining module is used for determining the production working condition of each single well according to the area of each single well in the dynamic control map; wherein the content of the first and second substances,
the control chart determination module includes:
the first curve acquisition submodule is used for determining an average theoretical pump efficiency curve of the oil layer according to the specific attribute parameter average value of the oil layer and a preset theoretical pump efficiency calculation formula;
the second curve acquisition submodule is used for determining a theoretical pump efficiency upper limit curve of the oil layer according to the specific attribute parameter upper limit value of the oil layer and the theoretical pump efficiency calculation formula;
the third curve acquisition submodule is used for determining a theoretical pump efficiency lower limit curve of the oil layer according to the specific attribute parameter lower limit value of the oil layer and the theoretical pump efficiency calculation formula;
the fourth curve acquisition submodule is used for determining a self-injection pressure lower limit curve of the oil layer according to the self-injection pressure lower limit value of the oil layer;
a fifth curve acquisition submodule for determining a reference pump efficiency lower limit curve of the oil layer;
the sixth curve acquisition submodule is used for determining a liquid supply capacity curve of the oil layer;
a seventh curve acquisition submodule for determining a break-and-break leakage curve of the oil layer;
and the dynamic control chart constructing submodule is used for drawing an average theoretical pump efficiency curve, a theoretical pump efficiency upper limit curve, a theoretical pump efficiency lower limit curve, a self-injection flow pressure lower limit curve, a reference pump efficiency lower limit curve, a liquid supply capacity curve and a break-and-lose curve of the oil layer in the same rectangular coordinate system with the flow pressure and the pump efficiency as coordinate axes to form a dynamic control chart of the oil layer.
7. Device for determining well production conditions according to claim 6, characterized in that said layer specific property parameters comprise:
water saturation rate, dissolved oil-gas ratio corresponding to suction inlet pressure of oil-well pump, volume coefficient corresponding to sinking pressure, stroke loss of oil-well pump, stroke frequency of oil-well pump, flow pressure, wellhead pressure, pump section pressure and well depth.
8. An apparatus for determining well production conditions as defined in claim 6, wherein said theoretical pump efficiency calculation formula comprises:
η'＝η1*η2*η3*η4*η5wherein, in the step (A),
η' is the theoretical pump efficiency;
η1η for free gas affected Pump efficiency1＝1/(1+((1-FW)*(33-Rg))*bg)；
η2For expansion of clearance gasPump efficiency under the influence of expansion, η2＝(S-(0.5*(1-FW)*(33-(2.71*Rg))*bg)/S；
η3η for the pump efficiency under the influence of elastic expansion and contraction of oil pipe and sucker rod3＝(S-Lmt)/S，Lmt＝((980*9.8*L*0.000001-(Pf-Pd))*L*fp*0.22)/206000；
η4η for Pump Effect under the influence of solution gas4＝FW+(1-FW)/0.998；
η5η for the pump efficiency under the influence of the pump barrel and valve loss5＝0.96；
Wherein, FWIs the water saturation ratio, RgDissolved oil-gas ratio corresponding to suction inlet pressure of oil well pump, bgVolume factor, L, corresponding to the submergence pressuremtIs the stroke loss of the oil pump, S is the stroke frequency of the oil pump, PfIs fluid pressure, PdFor well head pressure, fpIs the pump cross-sectional pressure, and L is the well depth.
9. Device for determining the production regime of an oil well according to claim 6, characterized in that the single-well information acquisition module is particularly adapted to determine the production regime according to a formula
Obtaining a pump efficiency of each single well corresponding to the oil layer;
η represents the pump efficiency of the oil pump of a single well, Q represents the daily liquid production of the single well, S represents the stroke of the oil pump of the single well, N represents the stroke frequency of the oil pump of the single well, and D represents the pump diameter of the oil pump of the single well.
10. Device for determining the production regime of an oil well according to claim 6, characterized in that the single-well information acquisition module is particularly adapted to determine the production regime according to the formula Pf＝Pc+(H1-H2)×(0.08+0.02×FW) X 0.0980665 obtaining the pump efficiency of each single well corresponding to the oil layer;
wherein, PfFor pumping oil from a single wellFlow pressure, P, of the oil reservoir to which the pump correspondscCasing pressure for a single well, H1The middle depth H of the oil layer corresponding to the single-well oil pump2Working fluid level depth of a single well, FWThe water content of the oil layer corresponding to the single-well oil pump.
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| CN107701177A (en) * | 2017-08-25 | 2018-02-16 | 中国石油天然气股份有限公司 | Geological exploration method and device |
| CN108119119B (en) * | 2017-12-06 | 2020-04-24 | 中国石油天然气股份有限公司 | Control method and system for fracturing horizontal well flowing stage |
| CN108678730A (en) * | 2018-05-15 | 2018-10-19 | 中国石油天然气股份有限公司 | Method for determining reasonable submergence of oil well |
| CN112392459A (en) * | 2019-08-14 | 2021-02-23 | 中国石油天然气股份有限公司 | Method and device for determining production characteristics of electric submersible plunger pump well |
| CN112418650A (en) * | 2020-11-19 | 2021-02-26 | 中国石油天然气集团有限公司 | Method and device for determining petroleum drilling construction progress |
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