CN114508334A - Karst cave circular seam channel technology determination method based on three-dimensional ground stress field distribution - Google Patents
Karst cave circular seam channel technology determination method based on three-dimensional ground stress field distribution Download PDFInfo
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- 238000005516 engineering process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 14
- 239000003129 oil well Substances 0.000 claims abstract description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000005465 channeling Effects 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 description 37
- 208000010392 Bone Fractures Diseases 0.000 description 36
- 238000010586 diagram Methods 0.000 description 13
- 230000000977 initiatory effect Effects 0.000 description 4
- 235000019994 cava Nutrition 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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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
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention relates to a karst cave circulation fracture communication technology determination method based on three-dimensional ground stress field distribution, which is based on the three-dimensional ground stress field distribution of a fracture-cavity type oil reservoir, comprehensively considers the influence of a three-dimensional ground stress field, the relative position of an oil production well and the position of a target karst cave on the karst cave communication, determines a proper karst cave communication technical scheme according to the connecting line of the starting point of the artificial crack and the geometric central point of the target karst cave in the horizontal plane where the starting point of the artificial crack of the well wall of the oil well is positioned, the angle value beta deviating from the horizontal maximum ground stress direction and the horizontal stress difference value, and improves the scientificity of acid fracturing reconstruction construction of the fracture-cavity type oil reservoir.
Description
Technical Field
The invention relates to the technical field of development of fracture-cavity oil reservoirs, in particular to a method for determining a karst cave circulation fracture communication technology based on three-dimensional ground stress field distribution of the fracture-cavity oil reservoir.
Background
The fracture-cavity type oil reservoir occupies an important position in the oil and gas resources in the world, and more than one third of the carbonate reservoir in the world belongs to the fracture-cavity type according to statistics. The karst cave in the fracture-cavity type oil reservoir is the most main reservoir body, how to communicate the karst cave through technical means such as acid fracturing (namely, injecting a large amount of acid liquor into an oil-gas reservoir from the ground, forming artificial cracks in the reservoir through high pressure, and using the cracks as oil-gas flow channels) and the like, and the establishment of the flow channel from the karst cave to an oil-gas shaft is an important research subject of current fracture-cavity type oil reservoir yield increase transformation. Because the fracture formed by acid fracturing follows the principle of expanding along the horizontal maximum principal stress direction, the karst cave deviating from the horizontal maximum principal stress direction is difficult to be communicated by the fracture, and in order to draw oil and gas reservoirs in the part of the karst cave, a plurality of fractures are forced to be formed in a reservoir layer by engineering technical means such as changing the perforation angle and using temporary plugging agents, so that the artificial fracture is promoted to deviate from the horizontal maximum principal stress direction, and the karst cave deviating from the horizontal maximum principal stress direction is further communicated.
At present, the construction of carrying out karst cave communication on site is basically in a blind construction state aiming at the karst cave in the direction of non-horizontal maximum principal stress, and no effective karst cave communication technology determination method is provided for designing different karst cave communication modes aiming at the karst caves in different directions, so that a better karst cave communication scheme in the direction of horizontal maximum principal stress is obtained.
Disclosure of Invention
The invention provides a method for determining a karst cave fracture-following communication technology based on three-dimensional ground stress field distribution of a fracture-cave type oil reservoir, different karst cave communication modes are designed aiming at karst caves in different directions, and an optimal karst cave communication technical scheme is determined.
The technical scheme of the invention is as follows:
a method for determining a karst cave joint circulation technology is characterized by comprising the following steps:
s1, acquiring geostress field data of the target fracture-cavity type oil and gas reservoir, and simulating a three-dimensional geostress field in finite element processing software;
s2, acquiring a karst cave position in the target fracture-cavity type oil and gas reservoir, and marking the karst cave position in the three-dimensional ground stress field of S1 to obtain a three-dimensional ground stress field marked with the karst cave;
s3, acquiring the position of an oil and gas well in the reservoir of the target fracture-cavity type oil and gas reservoir, and marking the position in the three-dimensional geostress field marked with the karst cave of S2 to obtain the three-dimensional geostress field marked with the karst cave and the oil and gas well;
s4, calculating the horizontal stress difference value of the reservoir of the target fracture-cavity type oil and gas reservoir according to the three-dimensional ground stress field marked with the karst cave and the oil and gas well in the step 3, wherein the horizontal stress difference value of the reservoir of the target fracture-cavity type oil and gas reservoir is the difference value of the maximum horizontal main stress value and the minimum horizontal main stress value obtained on the horizontal plane passing through the geometric center point of the target karst cave near the oil and gas well in the reservoir of the target fracture-cavity type oil and gas reservoir;
s5, determining a karst cave communication technology according to a connecting line between the artificial fracture initiation point and the geometric central point of the target karst cave in the horizontal plane where the geometric central point of the target karst cave and the artificial fracture initiation point of the oil well wall are located, an acute included angle or a right angle beta deviating from the horizontal maximum principal stress direction, and the horizontal stress difference value of the target karst cave calculated in S4, wherein the specific method is as follows: when beta is less than or equal to 10 degrees, a straight main crack is communicated with the target karst cave and the oil-gas well; when the beta is less than or equal to 10 degrees and less than or equal to 45 degrees and the horizontal stress difference value of the target karst cave is less than 30MPa, communicating the target karst cave with an oil-gas well through a bent main crack, wherein the bent main crack is realized by changing the perforation azimuth angle; when the angle beta is less than or equal to 45 degrees and less than or equal to 90 degrees and the horizontal stress difference value is less than 30MPa, the main cracks are communicated through a plurality of bent main cracks, and the main cracks are realized by changing the perforation azimuth angle and performing temporary blocking steering.
Preferably, in S1, the obtained three-dimensional ground stress field of the target fracture-cavity hydrocarbon reservoir includes an X-direction stress field, a Y-direction stress field, and a Z-direction stress field.
Preferably, in S4, the horizontal maximum principal stress value is determined by reading the three-dimensional ground stress field average value in the X direction, and the horizontal minimum principal stress value is determined by reading the three-dimensional ground stress field average value in the Y direction.
Preferably, in S5, the changing the perforation azimuth angle includes performing a perforation operation before performing the acid fracturing operation, and the perforation azimuth angle of the perforation operation points to the location of the karst cave.
Preferably, in S5, the temporary plugging diversion includes injecting the temporary plugging agent multiple times to plug the crack formed by the acid fracturing, increasing the fluid pressure in the crack, and forcing the new crack to deviate from the original crack, thereby forming a plurality of cracks with different directions.
Compared with the prior art, the invention has the advantages that the invention provides the method for determining the karst cave circulation communication technology based on the three-dimensional ground stress field distribution of the fracture-cavity type oil reservoir, the influence of the three-dimensional ground stress field, the distribution of the karst cave and the oil production well and the position of the target karst cave on the karst cave communication technology are comprehensively considered, the proper karst cave communication technical scheme is determined according to the connecting line of the geometric central point of the target karst cave and the geometric central point of the artificial crack of the oil well wall in the horizontal plane, the angular value beta deviating from the horizontal maximum main stress direction and the horizontal stress difference value, and the scientificity of the acid fracturing reconstruction construction of the fracture-cavity type oil reservoir is improved.
Drawings
FIG. 1 is a flow chart of a method for determining the karst cave joint-filling communication technology according to the present invention;
FIG. 2 is a schematic diagram of a communication technology determination process of the determination method of the karst cave joint-circulation technology of the invention, wherein solid dots are oil and gas wells, hollow dots are karst caves, and arrows are in the horizontal maximum principal stress direction;
FIG. 3 is an X-direction stress field diagram of a target fracture-cavity type hydrocarbon reservoir simulated in finite element software by the method for determining the karst cave circulation communication technology, wherein the abscissa is the length of the model, and the ordinate is the width of the model;
FIG. 4 is a simulated Y-direction stress field diagram of a target fracture-cavity type hydrocarbon reservoir in finite element software, wherein the Y-direction stress field diagram relates to the determination method of the karst cave circulation communication technology, the abscissa of the Y-direction stress field diagram is the length of a model, and the ordinate of the Y-direction stress field diagram is the width of the model;
FIG. 5 is a simulated Z-direction stress field diagram of a target fracture-cavity type hydrocarbon reservoir in finite element software, wherein the Z-direction stress field diagram relates to the determination method of the karst cave circulation technology, and the abscissa is the length of the model and the ordinate is the width of the model;
FIG. 6 is an X-direction stress field diagram of a three-dimensional ground stress field marked with a karst cave and an oil-gas well in a finite element software simulated by the determination method of the karst cave joint channeling technology, wherein the abscissa is the length of the model and the ordinate is the width of the model;
FIG. 7 is a Y-direction stress field diagram of a three-dimensional ground stress field marked with a karst cave and an oil-gas well in a finite element software simulated by the determination method of the karst cave joint channeling technology, wherein the abscissa is the length of the model and the ordinate is the width of the model;
FIG. 8 is a Z-direction stress field diagram of a three-dimensional ground stress field marked with a karst cave and an oil-gas well in a finite element software simulated by the determination method of the karst cave cyclic slot technology, wherein the abscissa is the length of the model and the ordinate is the width of the model.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to specific examples and comparative examples.
A method for determining a karst cave crack-filling communication technology, a flow chart of which is shown in fig. 1, comprises the following steps:
s1, acquiring a ground stress field of the target fracture-cavity type oil and gas reservoir, including an X-direction stress field, a Y-direction stress field and a Z-direction stress field, and simulating in finite element processing software, wherein the X-direction stress field obtained through the simulation is shown in figure 3, the Y-direction stress field is shown in figure 4, and the Z-direction stress field is shown in figure 5;
s2, acquiring a target karst cave position in the target fracture-cavity type oil and gas reservoir, and marking the target karst cave position in the three-dimensional ground stress field of S1 to obtain a three-dimensional ground stress field marked with the karst cave;
s3, acquiring the position of an oil and gas well in the target fracture-cavity type oil and gas reservoir, and marking the position in the three-dimensional geostress field marked with the karst cave of the model 2 to obtain a three-dimensional geostress field marked with the karst cave and the oil and gas well; the three-dimensional geostress field marked with the karst cave and the oil and gas well obtained through the specific simulation has the stress field in the X direction as shown in figure 6, the stress field in the Y direction as shown in figure 7 and the stress field in the Z direction as shown in figure 8;
and S4, calculating the horizontal stress difference value of the target fracture-cavity type oil and gas reservoir, wherein the horizontal stress difference value of the target fracture-cavity type oil and gas reservoir is the difference value of the horizontal maximum main stress value and the horizontal minimum main stress value, the horizontal maximum main stress value is determined by reading the three-dimensional ground stress field average value in the X direction, and the horizontal minimum main stress value is determined by reading the three-dimensional ground stress field average value in the Y direction. Specifically, as shown in fig. 3, the simulated X-direction stress field diagram of the target fracture-cavity reservoir in the finite element software has a maximum horizontal principal stress of about 50MPa, and fig. 4 is a simulated Y-direction stress field diagram of the target fracture-cavity reservoir in the finite element software, where the read minimum horizontal principal stress is about 45MPa, and the difference between the minimum horizontal principal stress and the read minimum horizontal principal stress is 5 MPa.
S5, it can be confirmed from the figures 6-8 that the angle values beta of the geometric center point of the karst cave deviating from the direction of the horizontal maximum principal stress are all about 30 degrees, and the horizontal stress difference value calculated in the S4 is 5MPa and less than 30MPa, comparing with figure 2(2), communication can be carried out through a bent principal crack, and the bent principal crack is realized by changing the perforation azimuth angle. And changing the perforating azimuth angle, wherein perforating operation is carried out before acid fracturing operation, and the perforating azimuth angle of the perforating operation points to the position of the karst cave.
In addition, if the geometric center point of the target karst cave and the artificial fracture initiation point of the oil well wall are located in a horizontal plane, the acute included angle beta of the connection line of the artificial fracture initiation point and the geometric center point of the target karst cave in the horizontal plane, which deviates from the horizontal maximum main stress direction, is shown in (1) of FIG. 2, beta is less than or equal to 10 degrees, and the target karst cave and the oil and gas well are communicated through a straight main fracture; or when the angle beta is less than or equal to 45 degrees and less than or equal to 90 degrees and the horizontal stress difference value is less than 30MPa, communicating through a plurality of bent main cracks, wherein the plurality of bent main cracks are realized by changing the perforation azimuth angle and performing temporary blocking steering. Changing the perforation azimuth angle, wherein the perforation operation is carried out before the acid fracturing operation is carried out, and the perforation azimuth angle of the perforation operation points to the position of the karst cave; the temporary plugging steering comprises the steps of injecting a temporary plugging agent for multiple times during acid fracturing operation, plugging a crack formed by acid fracturing, improving fluid pressure in the crack, forcing a new crack to deviate from an original crack, and further forming a plurality of cracks with different trends.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A karst cave circular seam channeling technology determination method based on three-dimensional ground stress field distribution is characterized by comprising the following steps:
s1, acquiring geostress field data of the target fracture-cavity type oil and gas reservoir, and simulating a three-dimensional geostress field in finite element processing software;
s2, acquiring a karst cave position in the target fracture-cavity type oil and gas reservoir, and marking the karst cave position in the three-dimensional ground stress field of S1 to obtain a three-dimensional ground stress field marked with the karst cave;
s3, acquiring the position of an oil and gas well in the reservoir of the target fracture-cavity type oil and gas reservoir, and marking the position in the three-dimensional geostress field marked with the karst cave in the step S2 to obtain the three-dimensional geostress field marked with the karst cave and the oil and gas well;
s4, calculating the horizontal stress difference value of the target fracture-cavity type oil and gas reservoir according to the three-dimensional ground stress field marked with the karst cave and the oil and gas well in the S3, wherein the horizontal stress difference value of the target fracture-cavity type oil and gas reservoir is the difference value of the maximum horizontal main stress value and the minimum horizontal main stress value which are obtained on the horizontal plane passing through the geometric center point of the target karst cave near the oil and gas well in the target fracture-cavity type oil and gas reservoir;
and S5, determining the karst cave communication technology according to the connection line between the geometric center point of the target karst cave and the geometric center point of the artificial crack of the oil well wall in the horizontal plane, the acute included angle or the right angle beta deviating from the horizontal maximum stress direction, and the horizontal stress difference value of the target karst cave calculated in S4.
2. The method for determining the karst cave communication technology according to claim 1, wherein in S5, the karst cave communication technology is determined according to the connection line between the geometric center point of the target karst cave and the geometric center point of the artificial fracture of the well wall in the horizontal plane, the connection line between the fracture point of the artificial fracture and the geometric center point of the target karst cave in the horizontal plane, the acute angle or the right angle β deviating from the horizontal maximum stress direction, and the horizontal stress difference value of the target karst cave calculated in S4, wherein when β is less than or equal to 10 °, the target karst cave and the oil and gas well are communicated through a straight main fracture; when the beta is less than or equal to 45 degrees at an angle of 10 degrees and the horizontal stress difference value of the target karst cave is less than 30MPa, the target karst cave and the oil-gas well are communicated through a bent main crack, and the bent main crack is realized by changing the perforation azimuth angle.
3. The method for determining the karst cave circulation communication technology according to claim 1 or 2, wherein in S5, the karst cave communication technology is determined according to the horizontal plane in which the geometric center point of the target karst cave and the artificial fracture starting point of the well wall are located, the connecting line of the artificial fracture starting point and the geometric center point of the target karst cave in the horizontal plane, the acute angle or the right angle beta deviating from the horizontal maximum stress direction, and the horizontal stress difference value of the target karst cave calculated in S4, wherein when the angle of 45 degrees < beta is less than or equal to 90 degrees and the horizontal stress difference value is less than 30MPa, communication is performed through a plurality of curved main cracks, and the plurality of curved main cracks are realized by changing the perforation azimuth angle and performing temporary blocking and steering.
4. The method for determining the karst cave channeling technology as claimed in claim 3, wherein the obtained three-dimensional ground stress field of the target fracture-type hydrocarbon reservoir in S1 includes an X-direction stress field, a Y-direction stress field and a Z-direction stress field.
5. The method for determining a karst cave trenching technology as claimed in claim 4, wherein in the step S4, the horizontal maximum principal stress value is determined by reading the three-dimensional earth stress field average value in the X direction, and the horizontal minimum principal stress value is determined by reading the three-dimensional earth stress field average value in the Y direction.
6. The method for determining the karst cave joint channeling technology as claimed in claim 3, wherein the changing the perforation azimuth angle in S5 comprises performing a perforation operation before performing the acid fracturing operation, and the perforation azimuth angle of the perforation operation points to the position of the karst cave.
7. The method for determining a cave-circulation trench technology according to claim 3, wherein in the step S5, the temporary plugging diversion includes injecting a temporary plugging agent for multiple times during the acid fracturing operation to plug the crack formed by the acid fracturing, increasing the fluid pressure in the crack, and forcing the new crack to deviate from the original crack, thereby forming a plurality of cracks with different trends.
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