CN114508338A - Acid liquor system selection method for hole finding through circular seam - Google Patents
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- 239000002253 acid Substances 0.000 title claims abstract description 160
- 238000010187 selection method Methods 0.000 title abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims description 113
- 239000007788 liquid Substances 0.000 claims description 21
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- 235000019994 cava Nutrition 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 2
- 230000000979 retarding effect Effects 0.000 claims description 2
- 238000009958 sewing Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 description 114
- 208000010392 Bone Fractures Diseases 0.000 description 102
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 1
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- 239000003129 oil well Substances 0.000 description 1
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- 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
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Abstract
The method comprises the steps of constructing a fracture-cavity three-dimensional geological model in geological modeling software by utilizing existing single-well logging data, seismic data and related construction production data of a fracture-cavity oil reservoir, and establishing a criterion for judging the type of acid fracturing fractures around a well, namely dividing the distance of the acid fracturing fractures needing to be communicated with a karst cave into three types, namely short-distance communicated fractures, medium-distance communicated fractures and long-distance communicated fractures, wherein the extension direction of the acid fracturing main fractures points to the karst cave, and an acid system for finding the cave along with the fracture is a gelled acid system; the cracks are communicated at a medium distance, the expansion direction of the acid fracturing main crack does not point to the karst cave, the deviation between the horizontal maximum stress direction of the stratum and the direction of the karst cave is small, and an acid system for finding the cave along with the cracks is a comprehensive application gelled acid and high-viscosity retarded acid system; the fractures are communicated in a long distance, the expansion direction of the acid fracturing main fracture does not point to the karst cave, the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is large, and an acid system for finding the cave through the seam is a reaction acid system comprehensively applying high-viscosity retarded acid and temperature control, so that an acid system selection method based on the hole finding through the seam is formed, and a basis is provided for efficient development and design of the fracture-cave oil reservoir.
Description
Technical Field
The invention relates to the technical field of development of fracture-cavity oil reservoirs, in particular to an acid liquor system selection method for finding a hole along a fracture.
Background
Carbonate reservoirs in China are rich in resources and mainly take fracture-cavity types as main resources. The exploitation of complex fracture-cavity carbonate reservoirs is an important field of exploration and development of oil and gas fields in China, natural fractures and karst cavities of the fracture-cavity carbonate reservoirs are developed, fracture-cavity reservoir space is randomly distributed, matrix rock masses are compact, based on the characteristics that the fractures and the cavities are developed simultaneously and the rocks react with acid, a yield-increasing technical idea of 'finding the cavities by means of the joints' is provided, reservoir reconstruction process measures guided by the idea are applied and implemented in engineering practice, an engineering acidification scheme system and an acid pressure scheme system matched with the geological characteristics of the reservoirs are formed step by step, the natural fractures around a shaft are fully utilized, karst cavity reservoir bodies are communicated through the communicated natural fractures, and finally the communication between the shafts of oil wells and the karst cavities is realized. The acid fracturing production increasing technology for finding the hole by means of the seam tracking changes the limitation that the conventional acid fracturing technology can only communicate the maximum horizontal stress direction karst cave, and no effective method for reasonably selecting an acid system according to the implementation process of seam tracking communication exists at present.
Disclosure of Invention
The invention provides an acid liquid system selection method for finding holes along a seam, which is used for determining different positions of karst caves under a designed communication path according to the position relation between the seam holes and a well hole, optimizing and realizing the acid liquid system for finding holes along the seam.
The technical scheme of the invention is as follows:
a method for selecting an acid liquor system for finding holes in a circular seam comprises the following steps:
step one, constructing a fracture-cave three-dimensional geological model in geological modeling software according to existing single-well logging data, seismic data and related construction production data of a fracture-cave oil reservoir stratum;
determining the position of a karst cave reservoir body needing to be communicated according to the three-dimensional geological model of the fracture-cave type oil reservoir, analyzing the distribution condition of natural fractures around the well, and determining the natural fractures needing acid etching treatment by acid liquor;
dividing the karst caves needing acid fracturing fracture communication into three conditions of short-distance communication, medium-distance communication and long-distance communication according to the distance between the fracture-cave reservoir body and the well hole, wherein the acid system for short-distance communication of the karst caves and cyclic fracture hole finding adopts a gelled acid system; an acid system for communicating the karst cave at a medium distance and finding the cave by means of circular sewing adopts a high-viscosity retarding acid system; the acid system for communicating the karst cave in a long distance and finding the cave along with the seam is a temperature-controlled reaction acid system.
Preferably, in the third step, the short-distance communication cavern is formed, and the distance between the acid fracturing fracture and the cavern is less than 30 meters.
Preferably, in the third step, the medium distance is communicated with the cavern, and the distance between the acid fracturing fracture and the cavern is 30-80 meters.
Preferably, in the third step, the long-distance communication cavern is formed, and the distance between the acid fracturing fracture and the cavern is more than 80 meters.
Preferably, in the third step, an optimal acid solution system capable of realizing cyclic fracture hole finding is further determined according to the communication condition between the acid fracturing fracture and the karst cave.
Preferably, the communication conditions of the acid fracturing fracture and the karst cave comprise good communication conditions of the fracture and the cave, medium communication conditions of the fracture and the cave and poor communication conditions of the fracture and the cave.
Preferably, the good fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture points to a karst cave; the fracture-cave communication condition is medium, namely the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is less than 45 degrees; the poor fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is greater than or equal to 45 degrees.
Preferably, the short-distance communication karst cave has good communication conditions with the fracture cave, and the optimal acid liquid system for finding the cave by means of the circulation of the fracture is a gelled acid system; the medium distance communication karst cave, the joint cave communication condition is medium, and the optimal acid liquid system for finding the cave by following the joint is a comprehensive application gelled acid and/or high-viscosity retarded acid system; the long-distance communication karst cave has poor communication condition of the slot cave, and the optimal acid liquid system for finding the slot cave along the slot is a system comprehensively applying high-viscosity retarded acid and/or temperature-controlled reaction acid.
The technology for finding the cave based on the circulation seam is that acid liquor is injected into a karst cave reservoir body in a certain range around a shaft, the acid liquor flows along a natural crack or a high-permeability zone, and under the condition of not being controlled by ground stress, the acid liquor is communicated with the karst cave reservoir body in different directions along the natural crack or the high-permeability zone, so that the karst cave reservoir body is communicated with the shaft on a plurality of channels in all directions, namely a shaft-crack-karst cave connecting network is formed, and the high-efficiency exploitation of the karst cave reservoir body is realized. According to the method, a fracture-cave three-dimensional geological model is constructed in geological modeling software according to existing single-well logging data, seismic data and related construction production data of the fracture-cave oil reservoir, and a fracture-follow-up hole finding technical thought is refined according to a periwell fracture type judgment standard, so that an acid liquor system selection method based on fracture-follow-up hole finding is formed, and a basis is provided for efficient development and design of the fracture-cave oil reservoir.
Drawings
FIG. 1 is a flow chart of the acid liquid system selection method for hole tracking and tracking according to the present invention;
FIG. 2 is a block A hole-seam three-dimensional geological model established by the acid liquid system selection method for finding holes along seams according to the invention;
FIG. 3 is a B-block fracture-hole three-dimensional geological model established by the acid liquid system selection method for finding holes along seams according to the invention;
FIG. 4 is a C-block fracture-hole three-dimensional geological model established by the acid liquid system selection method for finding holes along seams.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to specific examples.
Example 1
A flow chart of the method for selecting the acid system for finding the hole by following the seam of the fractured-vuggy carbonate reservoir in the A block is shown in figure 1, and the method comprises the following steps:
step one, constructing an A block fracture-cavity three-dimensional geological model shown in figure 2 in geological modeling software according to existing single-well logging data, seismic data and related construction production data in a fracture-cavity oil reservoir block;
determining the position of a karst cave reservoir body needing to be communicated according to the A block fracture three-dimensional geological model, wherein as shown in figure 2, the central coordinates of the position of the karst cave reservoir body needing to be communicated of the geological model are (1.5203E +7,4546120, -3980), and analyzing the development condition of natural fractures of the reservoir and the condition of natural fractures needing to be activated by injecting acid liquor;
and step three, dividing the karst cave needing acid fracturing fracture communication into three conditions of short-distance communication, medium-distance communication and long-distance communication according to the distance between the fracture-cave reservoir body and the well hole, wherein the short-distance communication between the karst cave and the acid fracturing fracture is less than 30 meters. The medium distance is communicated with the karst cave, and the distance between the acid fracturing fracture and the karst cave is between 30 and 80 meters. And the long-distance communication karst cave is communicated with the acid fracturing fracture, and the communication distance between the acid fracturing fracture and the karst cave is more than 80 meters.
The communication conditions of the acid fracturing fracture and the karst cave comprise good communication conditions of the fracture and the karst cave, medium communication conditions of the fracture and the karst cave and poor communication conditions of the fracture and the karst cave. The fracture-cave communication condition is good, namely the expansion direction of the acid fracturing main fracture points to a karst cave; the fracture-cave communication condition is medium, namely the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is less than 45 degrees; the poor fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is greater than or equal to 45 degrees.
The short-distance communication karst cave has good communication condition of the slot and the slot, and the optimal acid liquid system for finding the slot along the slot is a gelled acid system; the medium distance communication karst cave, the joint cave communication condition is medium, and the optimal acid liquid system for finding the cave by following the joint is a comprehensive application gelled acid and/or high-viscosity retarded acid system; the long-distance communication karst cave has poor communication condition of the slot cave, and the optimal acid liquid system for finding the slot cave along the slot is a system comprehensively applying high-viscosity retarded acid and/or temperature-controlled reaction acid.
Because the distance between the well hole and the karst cave reservoir body is 30 meters, the distance between the acid fracturing fracture and the karst cave is between 30 meters and 80 meters, the well hole is communicated with the karst cave at a medium distance, the expansion direction of the acid fracturing main fracture points to the karst cave, the communication condition of the karst cave is good, and a gelled acid system is determined and selected.
Example 2
The selection method of the joint-tracking hole-finding acid system of the B-block carbonate fracture-cavity oil reservoir comprises the following steps:
step one, constructing a B-block fracture-cavity three-dimensional geological model shown in figure 3 in geological modeling software according to existing single-well logging data, seismic data and related construction production data in a fracture-cavity oil reservoir block;
determining the position of a karst cave reservoir body needing to be communicated according to the B-block fracture three-dimensional geological model, wherein as shown in figure 3, the central coordinates of the position of the karst cave reservoir body needing to be communicated of the geological model are (1.5206E +7,4572080, -4050), analyzing the development of natural fractures of the reservoir and activating the natural fractures by injecting acid liquor;
and step three, dividing the karst cave needing acid fracturing fracture communication into three conditions of short-distance communication, medium-distance communication and long-distance communication according to the distance between the fracture-cave reservoir body and the well hole, wherein the short-distance communication between the karst cave and the acid fracturing fracture is less than 30 meters. The medium distance is communicated with the karst cave, and the distance between the acid fracturing fracture and the karst cave is between 30 and 80 meters. And the long-distance communication karst cave is communicated with the acid fracturing fracture, and the communication distance between the acid fracturing fracture and the karst cave is more than 80 meters.
The communication conditions of the acid fracturing fracture and the karst cave comprise good communication conditions of the fracture and the karst cave, medium communication conditions of the fracture and the karst cave and poor communication conditions of the fracture and the karst cave. The good fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture points to the karst cave; the fracture-cave communication condition is medium, namely the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is less than 45 degrees; the poor fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is greater than or equal to 45 degrees.
The short-distance communication karst cave has good communication condition of the slot and the slot, and the optimal acid liquid system for finding the slot along the slot is a gelled acid system; the medium distance communication karst cave, the joint cave communication condition is medium, and the optimal acid liquid system for finding the cave by following the joint is a comprehensive application gelled acid and/or high-viscosity retarded acid system; the long-distance communication karst cave has poor communication condition of the slot cave, and the optimal acid liquid system for finding the slot cave along the slot is a system comprehensively applying high-viscosity retarded acid and/or temperature-controlled reaction acid.
The distance between a well eye and a karst cave reservoir body is 50 meters, the distance between an acid fracturing fracture and a karst cave is between 30 and 80 meters, the well eye is a medium-distance communication karst cave, the extension direction of an acid fracturing main fracture does not point to the karst cave, the deviation between the horizontal maximum stress direction of a stratum and the direction of the karst cave is 30 degrees, the deviation between the horizontal maximum stress direction of the stratum and the direction of the karst cave is less than 45 degrees, the communication condition of the karst cave is medium, and the acid fracturing of the well is determined to be gelled acid or high-viscosity retarded acid.
Example 3
The method for selecting the acid liquor system for searching the holes along the seams of the C-block carbonate fracture-hole type oil reservoir comprises the following steps:
step one, constructing a C-block fracture-cavity three-dimensional geological model shown in figure 4 in geological modeling software according to existing single-well logging data, seismic data and related construction production data in a fracture-cavity oil reservoir block;
determining the position of a karst cave reservoir body needing to be communicated according to the C-block fracture three-dimensional geological model, wherein as shown in figure 4, the central coordinates of the position of the karst cave reservoir body needing to be communicated of the geological model are (1.5206E +7,4550000, -4180), analyzing the development of natural fractures of the reservoir and activating the natural fractures by injecting acid liquor;
and step three, dividing the karst cave needing acid fracturing fracture communication into three conditions of short-distance communication, medium-distance communication and long-distance communication according to the distance between the fracture-cave reservoir body and the well hole, wherein the short-distance communication between the karst cave and the acid fracturing fracture is less than 30 meters. The medium distance is communicated with the karst cave, and the distance between the acid fracturing fracture and the karst cave is between 30 and 80 meters. And the long-distance communication karst cave is communicated with the acid fracturing fracture, and the communication distance between the acid fracturing fracture and the karst cave is more than 80 meters.
The communication conditions of the acid fracturing fracture and the karst cave comprise good communication conditions of the fracture and the karst cave, medium communication conditions of the fracture and the karst cave and poor communication conditions of the fracture and the karst cave. The good fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture points to the karst cave; the fracture-cave communication condition is medium, namely the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is less than 45 degrees; the poor fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is greater than or equal to 45 degrees.
The short-distance communication karst cave has good communication condition of the slot and the slot, and the optimal acid liquid system for finding the slot along the slot is a gelled acid system; the medium distance communication karst cave, the joint cave communication condition is medium, and the optimal acid liquid system for finding the cave by following the joint is a comprehensive application gelled acid and/or high-viscosity retarded acid system; the long-distance communication karst cave has poor communication condition of the slot cave, and the optimal acid liquid system for finding the slot cave along the slot is a system comprehensively applying high-viscosity retarded acid and/or temperature-controlled reaction acid.
The distance between the well eye and a karst cave reservoir body is 103 meters, the distance between the acid fracturing fracture and the karst cave is more than 80 meters, the well eye is a long-distance communication karst cave, the expansion direction of the acid fracturing main fracture does not point to the karst cave, the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is 45 degrees, the communication condition of the karst cave is poor, and the well acid fracturing is determined to be a high-viscosity retarded acid and temperature control reaction acid system.
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 (8)
1. A method for selecting an acid liquor system for finding holes in a circular seam is characterized by comprising the following steps:
step one, constructing a fracture-cave three-dimensional geological model in geological modeling software according to existing single-well logging data, seismic data and related construction production data of a fracture-cave oil reservoir stratum;
determining the position of a karst cave reservoir body needing to be communicated according to the three-dimensional geological model of the fracture-cave type oil reservoir, analyzing the distribution condition of natural fractures around the well, and determining the natural fractures needing acid etching treatment by acid liquor;
dividing the karst caves needing acid fracturing fracture communication into three conditions of short-distance communication, medium-distance communication and long-distance communication according to the distance between the fracture-cave reservoir body and the well hole, wherein the acid system for short-distance communication of the karst caves and cyclic fracture hole finding adopts a gelled acid system; an acid system for communicating the karst cave at a medium distance and finding the cave by means of circular sewing adopts a high-viscosity retarding acid system; the acid system for communicating the karst cave in a long distance and finding the cave along with the seam is a temperature-controlled reaction acid system.
2. The method for selecting a cyclic holing acid system according to claim 1, wherein in the third step, the short-distance communication cavern, the distance between the acid fracturing fracture and the cavern is less than 30 m.
3. The method of claim 1, wherein in step three, the medium distance communication cavern is arranged, and the communication distance between the acid fracturing fracture and the cavern is 30-80 m.
4. The method for selecting a cyclic holing acid system according to claim 1, wherein in step three, the distance between the long-distance communication cavern and the communication between the acid fracturing fracture and the cavern is greater than 80 m.
5. The method for selecting a cyclic fracture-tunneling acid system according to any one of claims 1-4, wherein in the third step, an optimal acid system capable of performing cyclic fracture-tunneling is further determined according to the communication status between the acid fracturing fracture and the cavern.
6. The method of claim 5, wherein the communication conditions between the acid fracturing fracture and the cavern include good communication conditions between the fracture and the cavern, moderate communication conditions between the fracture and the cavern, and poor communication conditions between the fracture and the cavern.
7. The method for selecting a cyclic holing acid system according to claim 6, wherein the good holing communication condition means that the propagation direction of the acid fracturing main fracture points to a karst cave; the fracture-cave communication condition is medium, namely the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is less than 45 degrees; the poor fracture-cave communication condition means that the expansion direction of the acid fracturing main fracture does not point to the karst cave, and the deviation between the horizontal maximum stress direction of the stratum and the karst cave direction is greater than or equal to 45 degrees.
8. The method of claim 7, wherein the short-distance communication karst cave and the communication state of the slot cave are good, and the optimal acid liquid for the hole-finding through the circular seam is a gelled acid system; the medium distance communication karst cave, the joint cave communication condition is medium, and the optimal acid liquid system for finding the cave by following the joint is a comprehensive application gelled acid and/or high-viscosity retarded acid system; the long-distance communication karst cave has poor communication condition of the slot cave, and the optimal acid liquid system for finding the slot cave along the slot is a system comprehensively applying high-viscosity retarded acid and/or temperature-controlled reaction acid.
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