CN114016991B - Method for determining well body structure of butt joint well based on geothermal field distribution characteristics - Google Patents
Method for determining well body structure of butt joint well based on geothermal field distribution characteristics Download PDFInfo
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- CN114016991B CN114016991B CN202111088058.2A CN202111088058A CN114016991B CN 114016991 B CN114016991 B CN 114016991B CN 202111088058 A CN202111088058 A CN 202111088058A CN 114016991 B CN114016991 B CN 114016991B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention belongs to the technical field of geothermal wells, and particularly discloses a method for determining a well body structure of a butt-jointed well based on geothermal field distribution characteristics.
Description
Technical Field
The invention provides the technical field of geothermal wells, in particular a method for determining a well body structure of a butt joint well based on geothermal field distribution characteristics.
Background
The geothermal field is generally mainly controlled by the fluctuation and the spreading condition of a fracture structure of a substrate, is influenced by the lithological change of a stratum, has obvious increment and mutation in the vertical direction, has obvious directionality and banding in the horizontal direction, generally belongs to geothermal resources formed under the action mechanism of ground heat flow mainly based on conduction heat transfer, has polytropy in both the vertical direction and the horizontal direction and has the following change characteristics; (see FIG. 1)
The geothermal anomaly is the geothermal gradient anomaly and is the growth rate of the stratum which is not influenced by the atmospheric temperature and the temperature of which increases along with the depth. The change of the ground temperature gradient of the Guanzhong basin on the plane is complex, and the horizontal change rule can be reflected by the ground temperature gradient estimated by the wellhead temperature; as shown in fig. 2, the magnitude of the variation of the geothermal temperature, the temperature increase rate and the average geothermal gradient with the depth is an important thermal physical parameter for measuring the geothermal field condition of a region, and therefore, in the development stage, the determination of the variation of the geothermal temperature, the temperature increase rate and the average geothermal gradient with the depth has a very important meaning for the construction of geothermal wells.
Disclosure of Invention
In view of the above, the present invention provides a method for determining a butted well bore structure based on geothermal field distribution characteristics.
The technical scheme adopted by the invention is as follows:
a method for determining the well body structure of a butt-jointed well based on the distribution characteristics of the earth temperature field comprises
Determining the distance between a horizontal well and a vertical well, forming the horizontal well and the vertical well to two times of drilling, respectively setting temperature acquisition probes along the horizontal well and the vertical well, respectively acquiring a plurality of first logging temperatures of the horizontal well and a plurality of second logging temperatures of the vertical well at similar positions of a plurality of same structural units in the horizontal well and the vertical well along with the well depth, respectively determining a horizontal well ground temperature gradient simulation curve and a vertical well ground temperature gradient simulation curve according to the plurality of first logging temperatures and the plurality of second logging temperatures, determining the position range of a deviation point of a butt joint well according to the temperature increase rate of the horizontal well ground temperature gradient simulation curve, determining the vertical depth of a horizontal well target point and the vertical depth of the vertical well when the horizontal well ground temperature gradient simulation curve and the vertical well ground temperature gradient simulation curve have a plurality of intersection points and the change trends tend to be the same and stable, and determining the well body structure according to the position range of the deviation point, the vertical depth of the horizontal well and the vertical depth of the vertical well.
Preferably, the method for determining the position range of the deflecting point comprises the following steps:
and when the temperature increasing rate area is in a constant state, determining the position range of the deflecting point of the butted well according to the range of the horizontal well depth corresponding to the temperature increasing rate in the constant state.
Preferably, the position of the deflecting point of the butt joint well in the three-opening stage is determined according to the position range of the deflecting point of the butt joint well and a lower limit value set by the ground temperature;
preferably, the slope from the vertical section to the horizontal section of the butt joint well is obtained according to the position of the deflecting point and the vertical depth of the target point of the horizontal well, and the method is as follows
α＝Lcosα/L，
The position L of the deflecting point, alpha is an included angle formed by the horizontal well and the vertical direction, and Lcos alpha is the vertical depth;
preferably, the well depth of the vertical well target point is obtained according to the vertical depth of the vertical well;
in the invention, the 'one opening' means that a drilling and excavating stage is carried out on the ground surface, generally, a drill bit with the diameter of 444.5mm is adopted in the first opening, the casing pipe is lowered to the depth of 450m, the overlapped section is removed by 10m, and the actual suspension position is 440m;
the second opening means that on the basis of the first opening, the drill bits with different specifications are adopted for further excavation, generally, the drill bit with the diameter of 311.15mm is adopted for the second opening, and the depth of the second opening casing is lowered to 2000m;
the three-opening mode refers to a drilling stage continued on the basis of the two-opening mode, generally, the three-opening mode adopts a phi 215.9mm drill bit, and a three-opening bridge type sieve tube is arranged to the depth of 2500m;
the invention has the beneficial effects that:
the deflection point position, the horizontal well target point vertical depth and the vertical well vertical depth of the butt joint well can be accurately obtained through the variation values of the ground temperature, the temperature increasing rate and the average ground temperature gradient along with the depth, and the well body structure of the butt joint well is determined according to the deflection point position, the horizontal well target point vertical depth and the vertical well vertical depth, so that the constancy of a ground temperature field in a mining range can be guaranteed, and the output of a heat source is favorably stabilized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph of the heat flow value of the large earth in the Guanzhong basin;
FIG. 2 is a diagram of a Weihe basin temperature anomaly zone map;
FIG. 3 is a graph of geothermal well geothermal temperature as a function of formation depth;
FIG. 4 is a plot of geothermal gradient as a function of formation depth;
FIG. 5 is a schematic view of horizontal and vertical wells being constructed;
in the figure: 11-deflecting point, 12-A target point and 13-B target point.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
The invention provides a method for determining a well body structure of a butt joint well based on geothermal field distribution characteristics, which comprises the steps of determining the distance between a horizontal well and a straight well, respectively forming the horizontal well and the straight well to two times of drilling, respectively lowering a temperature acquisition probe along the horizontal well and the straight well, respectively acquiring a plurality of first well-logging temperatures of the horizontal well and a plurality of second well-logging temperatures of the straight well at similar positions of a plurality of same construction units in the horizontal well and the straight well along with the well depth, respectively determining a horizontal well geothermal gradient simulation curve and a straight well geothermal gradient simulation curve according to the plurality of first well-logging temperatures and the plurality of second well-logging temperatures, determining the position range of a deviation point of the butt joint well according to the temperature rise rate of the horizontal well geothermal gradient simulation curve, determining the vertical depth of the horizontal well and the straight well when the horizontal well geothermal gradient simulation curve and the straight well geothermal gradient simulation curve have a plurality of intersection points and the change trends of the same and stable, and determining the vertical depth of the horizontal well and straight well body structures according to the position range of the horizontal well deviation point, the target point and the vertical depth of the target point;
the interval between the horizontal well and the vertical well is 2000 meters, the horizontal well and the vertical well are respectively molded until the second cut is finished, a drill bit with the diameter of 444.5mm is adopted for the first cut, the casing pipe is driven into the horizontal well and the vertical well to the depth of 450m, the overlapping section is removed by 10m, and the actual hanging position is 440m; a drill bit with the diameter of 311.15mm is used for the second opening, and the depth of the second opening sleeve is lowered to 2000m;
the method for determining the position range of the deflecting point comprises the following steps:
when the temperature increasing rate area is in a constant state, determining the position range of the deflecting point of the butt joint well in the constant state according to the range of the temperature increasing rate corresponding to the well depth of the horizontal well;
determining the position of the deflecting point of the butt-jointed well in the three-opening stage according to the position range of the deflecting point of the butt-jointed well and the lower limit value set by the ground temperature;
it should be noted that three openings are made by using a drill bit with a diameter of 215.9mm, and a three-opening bridge type sieve tube is put into the three openings to a depth of 2500m;
the method comprises the following steps of obtaining the slope of a butt joint well from a vertical section to a horizontal section according to the position of a deflecting point and the vertical depth of a target point of a horizontal well, and specifically comprises the following steps:
α＝Lcosα/L，
and the position L of the deflecting point, alpha is an included angle formed by the horizontal well and the vertical direction, and Lcos alpha is the vertical depth of the horizontal well target point.
Acquiring the vertical well target point well depth according to the vertical depth of the vertical well;
the magnitude of the change values of the ground temperature, the temperature increasing rate and the average ground temperature gradient along with the depth is an important thermophysical parameter for measuring the condition of a ground temperature field in one region. The surveying planning area is located at the similar position of the same structural unit within the range, so the vertical variation characteristic of the geothermal water well basically represents the vertical variation characteristic of the geothermal water well surveying planning area.
The geothermal heating rate and the average geothermal gradient are calculated to analyze and demonstrate the vertical variation characteristics of the geothermal field in the region. The ground temperature (logging temperature) increases with increasing depth. As the depth increases, the earth temperature is substantially in an oblique straight line. The change rule of the average earth temperature gradient is just opposite to the change rule of an earth temperature curve along with the increase of the depth, the average earth temperature gradient shows a gradual attenuation trend, the shallow part is quickly attenuated, and the middle and rear parts are slowly attenuated. The geothermal heating rate generally changes between 2.0-3.0 ℃/100m along with the increase of the depth, and the geothermal heating rate is maintained at 2.55 ℃/100m towards the deeper part; the surveying planning area is located in the area with the geothermal gradient of 3.5-4.0 ℃/100m, as shown in figure 2;
data probed with reference to the following table:
table 1 shows the data table of the hot well temperature measurement in the planning area.
According to the historical data, a vertical well and a horizontal well are drilled and dug at the interval of 2000m, the temperature change process in different depth ranges is detected, and a geothermal well ground temperature change curve and a temperature gradient curve along with the depth of the ground layer are obtained, as shown in the graph 3 and the graph 4.
As can be seen from the graphs in FIGS. 3 and 4, the horizontal well geothermal gradient simulation curve and the vertical well geothermal gradient simulation curve have a plurality of intersection points with increasing depth and tend to have the same and stable variation trend, wherein the plurality of intersection points with the same and stable variation trend exist between 2000 and 3000 meters of the vertical depth of the bottom layer. According to the temperature increase rate in a constant state in the horizontal well geothermal gradient simulation curve, the corresponding horizontal well depth range is 1600-3500 m, and therefore the range of the deflection point is determined to be 1600-3500 m.
In order to determine the position reason of the deflecting point of the butt-jointed well in the three-opening stage according to the position range of the deflecting point of the butt-jointed well and the lower limit value set by the ground temperature, the invention sets the lower limit value to be 96.31 ℃, and the vertical depth corresponding to the temperature is 2500 meters, so that the deflecting point is determined to be 2000 meters.
Referring to fig. 5, a schematic diagram of horizontal and vertical wells constructed in fig. 5;
referring to table 3, table 3 shows the horizontal well trajectory parameters for horizontal and vertical wells determined using the method described above. And determining the position of the deflecting point, the position of the target point A of the horizontal well, the position of the target point B of the vertical well, and parameters such as well depth, well deviation, azimuth, vertical depth and the like determined by the position of the deflecting point, the position of the target point A of the horizontal well and the position of the target point B of the vertical well according to the method. The construction of the horizontal well and the vertical well and the butt well therebetween in fig. 5 can be completed by the parameters in table 3.
TABLE 3 orbital parameters
The technical solutions disclosed in the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained in the present document by using specific embodiments, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (5)
1. The method for determining the well body structure of the butt joint well based on the distribution characteristics of the geothermal field is characterized by comprising the following steps of:
determining the distance between a horizontal well and a vertical well, respectively forming the horizontal well and the vertical well to two times of complete drilling, respectively setting temperature acquisition probes along the horizontal well and the vertical well, respectively acquiring a plurality of first logging temperatures of the horizontal well and a plurality of second logging temperatures of the vertical well at similar positions of a plurality of same construction units in the horizontal well and the vertical well along with the well depth, respectively determining a horizontal well geothermal gradient simulation curve and a vertical well geothermal gradient simulation curve according to the plurality of first logging temperatures and the plurality of second logging temperatures, and determining the position range of a deviation point of a butt joint well according to the temperature increase rate of the horizontal well geothermal gradient simulation curve;
and when the horizontal well geothermal gradient simulation curve and the vertical well geothermal gradient simulation curve have a plurality of intersection points and the variation trend tends to be the same and stable, determining the horizontal well target point vertical depth and the vertical well vertical depth, and determining the butt joint well body structure according to the position range of the deflecting point of the butt joint well, the horizontal well target point vertical depth and the vertical well vertical depth.
2. The method of claim 1, wherein the location range of the kick-off point is determined by:
and when the temperature increasing rate area is in a constant state, determining the position range of the deflecting point of the butted well according to the range of the temperature increasing rate corresponding to the well depth of the horizontal well in the constant state.
3. The method of claim 1, and determining the position of the kick-off point of the butt joint well in the three-opening stage according to the position range of the kick-off point of the butt joint well and the lower limit value set by the ground temperature.
4. The method according to claim 3, wherein the slope of the butted well from the vertical section to the horizontal section is obtained according to the position of the three-opening-stage butted well slope making point and the vertical depth of the horizontal well target point, and the method comprises the following steps:
α＝Lcosα/L，
and the position L of the deflecting point, alpha is an included angle formed by the horizontal well and the vertical direction, and Lcos alpha is the vertical depth of the target point of the horizontal well.
5. The method of claim 1, wherein the target vertical well depth is obtained as a function of the vertical well depth.
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