CN114508335A - Multi-cave communication mode determination method and system based on three-dimensional ground stress field distribution of fracture-cave type oil reservoir - Google Patents
Multi-cave communication mode determination method and system based on three-dimensional ground stress field distribution of fracture-cave type oil reservoir Download PDFInfo
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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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- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a multi-cave communication mode determination method based on three-dimensional ground stress field distribution of a fracture-cave type oil reservoir, which comprises the following steps: acquiring a three-dimensional ground stress field of the fracture-cavity oil reservoir, and determining the direction of the maximum horizontal main stress; acquiring the positions of n karst caves in the fracture-cavity oil reservoir, and marking the positions in the acquired three-dimensional ground stress field; acquiring the position of an oil-gas well in the fracture-cavity type oil reservoir, and marking the position in the acquired three-dimensional ground stress field; and determining a karst cave communication mode. According to the determination method, three-dimensional ground stress field distribution is utilized, the relative position of the maximum horizontal principal stress direction and the karst cave is considered, different karst cave communication modes are designed, and the scientificity of fracture-cavity type oil reservoir acid fracturing reconstruction construction can be further improved. And the communication mode under the condition of a single karst cave and a plurality of karst caves is limited, and the method can be applied to various complex working conditions.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method and a system for determining a multi-solution-cavity communication mode based on three-dimensional ground stress field distribution of a fracture-cavity type oil reservoir.
Background
The fracture-cavity type oil reservoir occupies an important position in oil and gas resources in the world, and more than one third of carbonate reservoirs in the world belong to fracture-cavity types 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 and gas reservoir from the ground, forming artificial cracks in the reservoir through high pressure, and using the cracks as oil and gas flow channels) and the like, and the establishment of the flow channel from the karst cave to an oil and gas well bore is an important research subject for increasing the yield of the current fracture-cavity type oil reservoir. Natural fractures and karst caves in the fracture-cavity type oil reservoir are widely distributed, and how to utilize the communication karst caves of the natural fractures and the ground stress fields as much as possible needs to be further explored. Since the fracture formed by acid fracturing follows the principle of maximum horizontal principal stress (i.e., the fracture always extends in the direction of maximum horizontal principal stress), the caverns in the direction deviating from the original direction of maximum horizontal principal stress are difficult to communicate by the fracture, and in order to exploit the hydrocarbon reservoir in this part of the caverns, a plurality of caverns must be communicated by engineering means.
At present, a communication technology aiming at multiple caverns in different directions is not provided, the field construction is lack of pertinence, the ground stress field distribution is a control factor of a fracture extending path, and a method for determining a multi-cavern communication mode based on the three-dimensional ground stress field distribution of a fracture-cavity type oil reservoir is needed to be provided.
Disclosure of Invention
The invention aims to provide a communication technology aiming at multiple karst caves in different directions, namely a method for determining a multi-karst cave communication mode based on three-dimensional geostress field distribution of a fracture-cavity type oil reservoir.
The invention provides a multi-cave communication mode determination method based on three-dimensional ground stress field distribution of a fracture-cave type oil reservoir, which comprises the following steps:
acquiring a three-dimensional ground stress field of the fracture-cavity oil reservoir, and determining the direction of the maximum horizontal main stress;
acquiring the positions of n karst caves in the fracture-cavity oil reservoir, and marking the positions in the acquired three-dimensional ground stress field;
acquiring the position of an oil and gas well in the fracture-cavity oil reservoir, and marking the position in the acquired three-dimensional ground stress field;
the steps for determining the karst cave communication mode are as follows:
when the number of the karst caves is one, namely n is 1, the determination method is as follows:
acquiring an acute included angle or a right angle beta between a connecting line of the geometric center of the karst cave and the oil-gas well and the direction of the maximum horizontal principal stress, and determining the communication mode of the karst cave;
or when the karst caves are multiple, namely n is more than 1, the determination method is as follows:
the distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
Preferably, in the step of determining a karst cave communication mode, when there is one karst cave, that is, when n is 1, the following operations are performed:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, 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, θ is1Is 10 DEG, theta2Is 45 degrees.
Preferably, in the step of determining the karst cave communication mode, when there are a plurality of karst caves, that is, n > 1, the operation is as follows:
given three acute angles theta3And theta4And theta5And theta3＜θ4；
The distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is measured4＜β1The angle is less than or equal to 90 degrees, 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;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press open the crack to communicate with the n-1 th karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the n-1 th karst cave, injecting acid liquor but not pressing the crack, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or right angle) and when the wall surface of the n-1 th karst cave has natural cracks, injecting a temporary plugging agent to plug the cracks, then injecting acid liquor without pressing the cracks, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and reservoir rock.
Preferably, θ is3Is 10 DEG, theta4Is 45 DEG, theta5Is 10 deg..
The method for determining the multi-solution-cavity communication mode based on the three-dimensional ground stress field distribution of the fracture-cavity type oil reservoir has the following beneficial effects:
according to the determination method, three-dimensional ground stress field distribution is utilized, the relative position of the maximum horizontal principal stress direction and the karst cave is considered, different karst cave communication modes are designed, and the scientificity of fracture-cavity type oil reservoir acid fracturing reconstruction construction can be further improved. And the communication mode under the condition of a single karst cave and a plurality of karst caves is limited, and the method can be applied to various complex working conditions.
The invention also provides a multi-cavern communication mode determining system based on the three-dimensional geostress field distribution of the fracture-cavity type oil reservoir, which comprises a three-dimensional geostress field acquiring module, a cavern position acquiring module, an oil-gas well position acquiring module and a cavern communication mode determining module;
the three-dimensional geostress field acquisition module is used for acquiring a three-dimensional geostress field of the fracture-cavity type oil reservoir and determining the direction of the maximum horizontal principal stress, the karst cave position acquisition module is used for acquiring the positions of n karsts in the fracture-cavity type oil reservoir and marking the acquired positions in the three-dimensional geostress field, the oil and gas well position acquisition module is used for acquiring the oil and gas well positions in the fracture-cavity type oil reservoir and marking the acquired positions in the three-dimensional geostress field, and the karst cave communication mode determination module is used for the following operations:
the karst cave is one, namely when n is 1:
acquiring an acute included angle or a right angle beta between a connecting line of the geometric center of the karst cave and the oil-gas well and the direction of the maximum horizontal principal stress, and determining the communication mode of the karst cave;
or the karst caves are multiple, namely n is more than 1:
the distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
Preferably, the karst cave communication mode determination module comprises a first determination submodule and a second determination submodule;
when the number of the karst caves is one, that is, n is 1, the second determining submodule does not perform the operation and the first determining submodule performs the following operation:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, and the groove is formed by a plurality of bent main cracksFirstly, a plurality of bent main cracks are realized by changing perforation azimuth angles and performing temporary blocking steering;
or when the number of the karst caves is multiple, namely n is greater than 1, the first determining submodule does not execute the operation and the second determining submodule executes the following operation:
given three acute angles theta3And theta4And theta5And theta3＜θ4；
The distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is4＜β1The angle is less than or equal to 90 degrees, 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;
the karst cave which is close to the nth oil-gas well is an nth cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth karst cave and the direction of the maximum horizontal principal stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press open the crack to communicate with the n-1 th karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the n-1 th karst cave, injecting acid liquor but not pressing the crack, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or right angle) and when the wall surface of the n-1 th karst cave has natural cracks, injecting a temporary plugging agent to plug the cracks, and then injecting acid liquor without pressingAnd (5) cracking, and communicating the nth karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock.
The multi-solution-cavity communication mode determining system based on the three-dimensional geostress field distribution of the fracture-cavity type oil reservoir has the same technical effect by adopting the determining method.
Drawings
Fig. 1 is a schematic flow chart of a specific embodiment of a multi-cavern communication mode determination method based on three-dimensional geostress field distribution of a fracture-cavity type oil reservoir provided by the invention;
FIG. 2 is a schematic representation of the target reservoir stress field referred to in example 1;
FIG. 3 is a schematic representation of the target reservoir stress field with well locations marked in example 1;
FIG. 4 is a schematic diagram of the stress field of the target reservoir marked with the location of the cavern in example 1;
FIG. 5 is a schematic view of a communication mode in karst cave in example 1;
FIG. 6 is a schematic representation of the target reservoir stress field referred to in example 2;
FIG. 7 is a schematic representation of the target reservoir stress field with well locations marked in example 2;
FIG. 8 is a schematic diagram of the target reservoir stress field with the cavern location marked in example 2;
FIG. 9 is a schematic view of a communication mode in karst cave in example 2;
FIG. 10 is a schematic representation of the target reservoir stress field referred to in example 3;
FIG. 11 is a schematic representation of the target reservoir stress field with well locations marked in example 3;
FIG. 12 is a schematic of the stress field of the target reservoir with the cavern location marked in example 3;
FIG. 13 is a schematic view of a karst cave communication mode in example 3;
fig. 14 is a schematic structural diagram of a specific embodiment of a multi-cavern communication mode determination system based on three-dimensional geostress field distribution of a fracture-cavity reservoir provided by the invention.
The reference numerals in fig. 1-14 are as follows:
the karst cave communication model comprises a first karst cave 1, a second karst cave 2, a third karst cave 3, a first oil and gas well 4, a fourth karst cave 5, a fifth karst cave 6, a sixth karst cave 7, a second oil and gas well 8, a seventh karst cave 9, an eighth karst cave 10, a third oil and gas well 11, a three-dimensional ground stress field acquisition module 12, a karst cave position acquisition module 13, an oil and gas well position acquisition module 14 and a karst cave communication mode determination module 15.
Detailed Description
As shown in fig. 1 to 14, fig. 1 is a schematic flow chart of a multi-cavern communication mode determination method based on three-dimensional geostress field distribution of a fracture-cavity reservoir according to an embodiment of the present invention;
FIG. 2 is a schematic representation of the target reservoir stress field referred to in example 1;
FIG. 3 is a schematic representation of the target reservoir stress field with well locations marked in example 1;
FIG. 4 is a schematic diagram of the stress field of the target reservoir marked with the location of the cavern in example 1;
FIG. 5 is a schematic view of a communication mode in karst cave in example 1;
FIG. 6 is a schematic representation of the target reservoir stress field referred to in example 2;
FIG. 7 is a schematic representation of the target reservoir stress field with well locations marked in example 2;
FIG. 8 is a schematic diagram of the target reservoir stress field with the cavern location marked in example 2;
FIG. 9 is a schematic view of a communication mode in karst cave in example 2;
FIG. 10 is a schematic representation of the target reservoir stress field referred to in example 3;
FIG. 11 is a schematic representation of the target reservoir stress field with well locations marked in example 3;
FIG. 12 is a schematic representation of the target reservoir stress field with the cavern location marked in example 3;
FIG. 13 is a schematic view of a karst cave communication mode in example 3;
fig. 14 is a schematic structural diagram of a specific embodiment of a multi-cavern communication mode determination system based on three-dimensional geostress field distribution of a fracture-cavity reservoir provided by the invention.
The direction indicated by the single-headed arrows in fig. 2-13 indicates the direction of maximum horizontal principal stress, and the double-headed arrows in fig. 13 indicate that acid-rock reaction occurs without fracturing the fracture.
With reference to fig. 1, a method for determining a multi-solution-cavity communication mode based on three-dimensional geostress field distribution of a fracture-cavity type oil reservoir comprises the following steps:
acquiring a three-dimensional ground stress field of the fracture-cavity oil reservoir, and determining the direction of the maximum horizontal main stress (the direction indicated by a one-way arrow shown in figures 2-13);
acquiring the positions of n karst caves in the fracture-cavity oil reservoir, and marking the positions in the acquired three-dimensional ground stress field;
acquiring the position of an oil-gas well in the fracture-cavity oil reservoir, and marking the position in the acquired three-dimensional ground stress field;
the steps for determining the karst cave communication mode are as follows:
when the number of the karst caves is one, namely n is 1, the determination method is as follows:
acquiring an acute included angle or a right angle beta between a connecting line of a geometric center of the karst cave and an oil-gas well and the direction of the maximum horizontal main stress, and determining a karst cave communication mode;
or when the number of the karst caves is more than 1, the determination method is as follows:
the karst cave closest to the oil-gas well is a first karst cave, and an acute included angle or a right angle beta between the connection line of the geometric center of the first karst cave and the oil-gas well and the direction of the maximum horizontal main stress is obtained1Determining a first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is the nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
According to the determination method, three-dimensional ground stress field distribution is utilized, the relative position of the maximum horizontal principal stress direction and the karst cave is considered, different karst cave communication modes are designed, and the scientificity of fracture-cavity type oil reservoir acid fracturing reconstruction construction can be further improved. And the communication mode under the condition of a single karst cave and a plurality of karst caves is limited, and the method can be applied to various complex working conditions.
Wherein, when the number of the karst caves is one, that is, n is 1, the operation is as follows:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a bent main crack, wherein the bent main crack is realized by changing a perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, 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.
The reference to "changing the perforation azimuth" means that the perforation operation is performed before the acid fracturing is performed, and the perforation azimuth points to the position of the karst cave.
The temporary blocking and steering refers to that when acid fracturing is carried out, temporary blocking agent is injected for many times to block the crack formed by acid fracturing, a three-dimensional ground stress field is changed, a new crack is forced to deviate from the original crack, and then a plurality of cracks with different trends are formed.
Further, θ1Is 10 DEG theta2Is 45 degrees.
In another case, when there are a plurality of karsts, i.e., n > 1, the operation is as follows:
given three acute angles theta3And theta4And theta5And θ3＜θ4；
The karst cave closest to the oil-gas well is a first karst cave, and an acute included angle or a right angle beta between the connection line of the geometric center of the first karst cave and the oil-gas well and the direction of the maximum horizontal main stress is obtained1Determining a first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is4＜β1Not more than 90 degrees, and ditches are made through a plurality of bent main cracksFirstly, a plurality of bent main cracks are realized by changing perforation azimuth angles and performing temporary blocking steering;
the karst cave which is close to the nth of the oil-gas well is the nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press the crack open to communicate with the nth karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, firstly injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the (n-1) th karst cave, injecting acid liquor but not pressing the crack, and communicating the (n) th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or right angle) and when the wall surface of the n-1 th karst cave has natural cracks, injecting a temporary plugging agent to plug the cracks, then injecting acid liquor but not pressing the cracks, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock.
Further, θ3Is 10 DEG theta4Is 45 DEG theta5Is 10 deg..
The following is a detailed description in conjunction with three examples.
Example 1, with reference to fig. 2-5:
the three-dimensional ground stress field of the target hydrocarbon reservoir (fracture-cavity reservoir) is obtained, and the direction of the maximum principal stress is determined, as shown in fig. 2.
The locations of multiple caverns in the target hydrocarbon reservoir are acquired and marked in the acquired three-dimensional geostress field, as shown in fig. 3.
The first well 4 location in the target reservoir is acquired and marked in the acquired three dimensional geostress field as shown in fig. 4.
According to the angle value beta of the karst cave (marked as a first karst cave 1) closest to the first oil-gas well 4 deviating from the direction of the maximum horizontal principal stress1Determining the communication mode: the deviation of the karst cave (marked as the first karst cave 1) closest to the first oil and gas well 4 from the maximum level should be mainlyAngle value beta of force direction1At 0 deg., communicating with the first cavern 1 through a main crack, as shown in fig. 5.
Determining a communication mode of a karst cave (marked as a second karst cave 2) which is second and close to the first oil and gas well 4: an acute included angle between a connecting line of the geometric center of the first cave 1 and the geometric center of the second cave 2 and the direction of the maximum horizontal main stress is less than 10 degrees, and no natural crack exists on the wall surface of the first cave 1, and acid liquor is directly injected to press open the crack to communicate with the second cave 2, as shown in fig. 5.
Determining a communication mode of a karst cave (marked as a third karst cave 3) which is third and close to the first oil and gas well 4: an acute included angle between a connecting line of the geometric center of the second cave 2 and the geometric center of the third cave 3 and the direction of the maximum horizontal main stress is less than 10 degrees, and no natural crack exists on the wall surface of the second cave 2, acid liquor is directly injected to press open the crack to communicate with the third cave 3, as shown in figure 5.
The block has only three karst caves, all communicated.
Example 2, with reference to fig. 6-9:
a three-dimensional geostress field of a target hydrocarbon reservoir (fracture-cavity reservoir) is obtained and the direction of the maximum principal stress is determined, as shown in fig. 6.
The locations of multiple caverns in the target reservoir are obtained and marked in the obtained three-dimensional geostress field, as shown in fig. 7.
The location of the second well 8 in the target reservoir is acquired and marked in the acquired three-dimensional geostress field, as shown in fig. 8.
According to the angle value beta of the karst cave (marked as a fourth karst cave 5) closest to the second oil-gas well 8 deviating from the direction of the maximum horizontal main stress1Determining the communication mode: the angle value beta of the karst cave (marked as the fourth karst cave 5) closest to the second oil-gas well 8 deviating from the direction of the maximum horizontal principal stress1Approximately 30 deg. communication is through a curved primary fracture, which is achieved by changing the perforation azimuth, as shown in figure 9.
Determining a communication mode of a karst cave (marked as a fifth karst cave 6) which is second near to the second oil and gas well 8: an acute included angle between a connecting line of the geometric center of the fourth cave 5 and the geometric center of the fifth cave 6 and the direction of the maximum horizontal main stress is less than 10 degrees, and no natural crack exists on the wall surface of the fourth cave 5, and acid liquor is directly injected to press open the crack to communicate with the fifth cave 6, as shown in fig. 9.
Determining a communication mode of a karst cave (marked as a sixth karst cave 7) which is close to the second oil and gas well 8 in the third place: an acute included angle between a connecting line of the geometric center of the fifth cave 6 and the geometric center of the sixth cave 7 and the direction of the maximum horizontal main stress is less than 10 degrees, and no natural crack exists on the wall surface of the fifth cave 6, and acid liquor is directly injected to press open the crack to communicate with the sixth cave 7, as shown in fig. 9.
The block has only three karst caves, all communicated.
Example 3, in conjunction with fig. 10-13:
and acquiring a three-dimensional ground stress field of the target oil and gas reservoir, and determining the direction of the maximum horizontal main stress, as shown in figure 10.
Acquiring the positions of a plurality of karsts in a target oil and gas reservoir, and marking the acquired three-dimensional ground stress field, as shown in fig. 11;
the location of the third well 11 in the target reservoir is acquired and marked in the acquired three-dimensional geostress field as shown in figure 12.
According to the angle value beta of the karst cave (marked as a seventh karst cave 9) closest to the third oil-gas well 11 deviating from the direction of the maximum horizontal main stress1Determining the communication mode: the angle value beta of the karst cave (marked as the seventh karst cave 9) closest to the third oil and gas well 11 deviating from the direction of the maximum horizontal principal stress1Approximately 80 deg. and communicated through a plurality of curved primary fractures by changing the perforation azimuth and performing a temporary plugging diversion as shown in figure 13.
Determining a communication mode of a karst cave (marked as an eighth karst cave 10) which is second near to the third oil and gas well 11: an acute included angle between a connection line of the geometric center of the seventh cave 9 and the geometric center of the eighth cave 10 and the direction of the maximum horizontal principal stress is larger than 10 degrees, no natural crack exists on the wall surface of the seventh cave 9, acid liquor is injected but the crack is not pressed, and the eighth cave 10 is communicated by utilizing the chemical reaction of the acid liquor and reservoir rock, as shown in fig. 13.
The block has only two cavities, which are communicated.
With reference to fig. 14, the present invention further provides a multi-cavern communication mode determination system based on three-dimensional geostress field distribution of a fracture-cavern type oil reservoir, including a three-dimensional geostress field obtaining module 12, a cavern position obtaining module 13, an oil-gas well position obtaining module 14, and a cavern communication mode determination module 15;
the three-dimensional geostress field acquisition module 12 is used for acquiring a three-dimensional geostress field of a fracture-cavity type oil reservoir and determining a maximum horizontal principal stress direction, the karst cave position acquisition module 13 is used for acquiring the positions of n karsts in the fracture-cavity type oil reservoir and marking the positions in the acquired three-dimensional geostress field, the oil and gas well position acquisition module 14 is used for acquiring the oil and gas well positions in the fracture-cavity type oil reservoir and marking the positions in the acquired three-dimensional geostress field, and the karst cave communication mode determination module 15 is used for the following operations:
when the karst cave is one, namely n is 1:
acquiring an acute included angle or a right angle beta between a connecting line of a geometric center of the karst cave and an oil-gas well and the direction of the maximum horizontal main stress, and determining a karst cave communication mode;
or a plurality of karst caves, namely n is more than 1:
the nearest karst cave to the oil-gas well is a first karst cave, the geometric center of the first karst cave and the acute included angle or the right angle beta between the connecting line of the oil-gas well and the direction of the maximum horizontal main stress are obtained1Determining a first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is the nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
Further, the karst cave communication mode determination module 15 includes a first determination submodule and a second determination submodule;
when the number of the karst caves is one, namely n is 1, the second determining submodule does not execute the operation and the first determining submodule executes the following operation:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a curved main slit, curvedThe main fracture of (2) is realized by changing the perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, 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;
or when the number of the karst caves is multiple, namely n is more than 1, the first determining submodule does not execute the operation and the second determining submodule executes the following operation:
given three acute angles theta3And theta4And theta5And theta3＜θ4；
The nearest karst cave from the oil-gas well is a first karst cave, the geometric center of the first karst cave is obtained, the connecting line of the oil-gas well and the acute included angle or the right angle beta between the directions of the maximum horizontal main stress1Determining the first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is4＜β1The angle is less than or equal to 90 degrees, 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;
the karst cave which is close to the nth of the oil-gas well is the nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press open the crack to communicate with the n-1 th karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the n-1 th karst cave, injecting acid liquor but not pressing the crack, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or at right angle) and the wall surface of the n-1 th karst caveAnd when a natural crack exists, injecting a temporary plugging agent to plug the crack, then injecting acid liquor without pressing the crack open, and communicating the nth karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock.
The multi-cave communication mode determining system based on the three-dimensional geostress field distribution of the fracture-cave type oil reservoir has the same technical effect by adopting the determining method.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The method for determining the multi-solution-cavern communication mode based on the three-dimensional ground stress field distribution of the fracture-cavern type oil reservoir is characterized by comprising the following steps of:
acquiring a three-dimensional ground stress field of the fracture-cavity oil reservoir, and determining the direction of the maximum horizontal main stress;
acquiring the positions of n karst caves in the fracture-cavity oil reservoir, and marking the positions in the acquired three-dimensional ground stress field;
acquiring the position of an oil and gas well in the fracture-cavity oil reservoir, and marking the position in the acquired three-dimensional ground stress field;
the steps for determining the karst cave communication mode are as follows:
when the number of the karst caves is one, namely n is 1, the determination method is as follows:
acquiring an acute included angle or a right angle beta between a connecting line of the geometric center of the karst cave and the oil-gas well and the direction of the maximum horizontal principal stress, and determining the communication mode of the karst cave;
or when the number of the karst caves is multiple, namely n is more than 1, the determination method is as follows:
the distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
2. The method for determining the multi-cavern communication mode based on the three-dimensional geostress field distribution of the fracture-cavity oil reservoir as claimed in claim 1, wherein in the step of determining the cavern communication mode, one cavern is determined, that is, when n is 1, the method is performed as follows:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, 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.
3. The method for determining the multi-cavern communication mode based on the three-dimensional ground stress field distribution of the fracture-cavity reservoir as claimed in claim 2, wherein θ is1Is 10 DEG, theta2Is 45 degrees.
4. The method for determining the multi-cavern communication mode based on the three-dimensional geostress field distribution of the fracture-cavity oil reservoir as claimed in claim 1, wherein in the step of determining the cavern communication mode, a plurality of caverns are provided, that is, when n > 1, the operation is as follows:
given three acute angles theta3And theta4And theta5And theta3＜θ4；
The distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is4＜β1The angle is less than or equal to 90 degrees, 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;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press open the crack to communicate with the n-1 th karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the n-1 th karst cave, injecting acid liquor but not pressing the crack, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or right angle) and when the wall surface of the n-1 th karst cave has natural cracks, injecting a temporary plugging agent to plug the cracks, then injecting acid liquor without pressing the cracks, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and reservoir rock.
5. The method for determining the multi-cavern communication mode based on the three-dimensional ground stress field distribution of the fracture-cavity reservoir as claimed in claim 4, wherein θ is3Is 10 DEG, theta4Is 45 deg., theta5Is 10 deg..
6. The multi-cavern communication mode determining system based on three-dimensional geostress field distribution of the fracture-cavity type oil reservoir is characterized by comprising a three-dimensional geostress field obtaining module, a cavern position obtaining module, an oil-gas well position obtaining module and a cavern communication mode determining module;
the three-dimensional geostress field acquisition module is used for acquiring a three-dimensional geostress field of the fracture-cavity type oil reservoir and determining the direction of the maximum horizontal principal stress, the karst cave position acquisition module is used for acquiring the positions of n karsts in the fracture-cavity type oil reservoir and marking the acquired positions in the three-dimensional geostress field, the oil and gas well position acquisition module is used for acquiring the oil and gas well positions in the fracture-cavity type oil reservoir and marking the acquired positions in the three-dimensional geostress field, and the karst cave communication mode determination module is used for the following operations:
the karst cave is one, namely when n is 1:
acquiring an acute included angle or a right angle beta between a connecting line of the geometric center of the karst cave and the oil-gas well and the direction of the maximum horizontal principal stress, and determining the communication mode of the karst cave;
or the karst caves are multiple, namely n is more than 1:
distance the nearest karst cave of oil gas well is first karst cave, acquires first karst cave geometric centre with the line of oil gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode.
7. The system for determining the multi-cave communication mode based on the three-dimensional geostress field distribution of the fracture-cave reservoir according to claim 6, wherein the cave communication mode determination module comprises a first determination submodule and a second determination submodule;
when the number of the karst caves is one, that is, n is 1, the second determining submodule does not perform the operation and the first determining submodule performs the following operation:
given two acute angles theta1And theta2And theta1＜θ2When beta is not more than theta1Communicating through a straight main crack; when theta is1＜β≤θ2Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is2Beta is less than or equal to 90 degrees, 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;
or when the number of the karst caves is multiple, namely n is greater than 1, the first determining submodule does not execute the operation and the second determining submodule executes the following operation:
given three acute angles theta3And theta4And theta5And theta3＜θ4；
The distance the nearest solution cavity of oil and gas well is first solution cavity, acquires first solution cavity geometric centre with the line of oil and gas well with sharp contained angle or right angle beta between the biggest horizontal principal stress direction1Determining the first karst cave communication mode: when beta is1≤θ3Communicating through a straight main crack; when theta is3＜β1≤θ4Communicating through a curved main fracture, wherein the curved main fracture is realized by changing a perforation azimuth angle; when theta is measured4＜β1The angle is less than or equal to 90 degrees, 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;
the karst cave which is close to the nth of the oil-gas well is an nth karst cave, and an acute included angle or a right angle beta between the connecting line of the geometric center of the nth-1 karst cave and the geometric center of the nth karst cave and the direction of the maximum horizontal main stress is obtainednAnd determining the nth karst cave communication mode: when beta isn＜θ5When no natural crack exists on the wall surface of the n-1 th karst cave, acid liquor is directly injected to press open the crack to communicate with the n-1 th karst cave; when beta isn＜θ5When a natural crack exists on the wall surface of the n-1 th karst cave, injecting a temporary plugging agent to plug the natural crack, and then injecting acid liquor to press the crack open to communicate with the n-1 th karst cave; when beta isn＞θ5(or right angle) and when no natural crack exists on the wall surface of the n-1 th karst cave, injecting acid liquor but not pressing the crack, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and the reservoir rock; when beta isn＞θ5(or right angle) and when the wall surface of the n-1 th karst cave has natural cracks, injecting a temporary plugging agent to plug the cracks, then injecting acid liquor without pressing the cracks, and communicating the n-th karst cave by utilizing the chemical reaction of the acid liquor and reservoir rock.
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