CN111219177A - Fracturing method for 3-inch half-slim well of ultra-low permeability sandstone reservoir sidetracking horizontal well - Google Patents
Fracturing method for 3-inch half-slim well of ultra-low permeability sandstone reservoir sidetracking horizontal well Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 55
- 239000003129 oil well Substances 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 31
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- 238000012986 modification Methods 0.000 claims description 19
- 230000001154 acute effect Effects 0.000 claims description 18
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 6
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 5
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 5
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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Abstract
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of: step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft; step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well; step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well; step 4), performing first-stage fracturing construction; step 5) adding a temporary plugging agent to perform primary crack temporary plugging; step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages; and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Description
Technical Field
The invention belongs to the technical field of oil extraction engineering, and particularly relates to a 3-inch half-small-borehole fracturing method for a sidetracking horizontal well of an ultra-low permeability sandstone reservoir.
Background
The existing ultra-low permeability sandstone reservoir is developed by adopting a development mode mainly comprising water injection and fracturing, and is influenced by reservoir heterogeneity and fracture extension after multiple measures, and an oil well with upward fracture has a water drive dominant direction, so that the main oil well is subjected to early water breakthrough, the productivity loss is serious, and the residual oil cannot be fully exploited for potential excavation. The sidetracking horizontal well can effectively increase single well control reserve, has the advantages of large contact area with an oil layer, large modification volume, high single well yield and the like compared with a directional well, and can realize comprehensive efficiency improvement.
The side-drilling horizontal well excavation residual oil mainly has the following problems at present: firstly, the water injection development of the old area forms a waterline in the direction of the maximum main stress (the direction of the water injection well row), the water breakthrough risk is large, the length of a horizontal section is small, the number of modification sections is small, and the production improvement difficulty is large; and secondly, a 3-inch semi-horizontal well shaft does not have a mature staged fracturing tool, and staged fracturing modification difficulty is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a 3-inch half-slim hole fracturing method for a sidetracking horizontal well of an ultra-low permeability sandstone reservoir, and overcomes the defects in the prior art that 1: the water injection development of the old area forms a waterline in the direction of the maximum main stress (the direction of the water injection well drainage), and the water breakthrough risk is large; 2. the length of the horizontal section is small, the number of the modified sections is small, and the production increasing difficulty is high; 3. the 3-inch semi-horizontal well shaft does not have a mature staged fracturing tool, and the staged fracturing reconstruction difficulty is high.
In order to solve the technical problem, the technical scheme of the invention is as follows: a3-inch half-small borehole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir comprises the following steps: step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft; step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well; step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well; step 4), performing first-stage fracturing construction; step 5) adding a temporary plugging agent to perform primary crack temporary plugging; step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages; and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, the water flooding oil well in the step 1) is an angle well in the well drainage direction, wherein the water flooding oil well can be communicated with the water injection well together to form a waterline at the later stage; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is connected with a 3-inch semi-oil layer casing through a tail pipe hanger in an oil layer casing of the water flooded oil well, wherein the outer side of the 3-inch semi-oil layer casing is filled with well cementation cement, and the 3-inch semi-oil layer casing is arranged along the direction obliquely crossed with the maximum main stress of a reservoir layer to form the horizontal section of the sidetracking horizontal well.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the maximum main stress direction of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Preferably, the step 3) of setting the single upper sealing fracturing string in the vertical well casing section means that the single upper sealing fracturing string is set in the vertical well section of the oil layer casing of the water logging well through a fracturing oil pipe, wherein the single upper sealing fracturing string is sequentially connected with an oil pipe adjusting short section, a variable buckle, a restrictor, a packer and a hydraulic anchor from bottom to top, the packer is a K344 packer, the upper end of the hydraulic anchor is connected with the fracturing oil pipe, and the packer is located in a 3-inch half oil layer casing and is located at the lower side of a tail pipe hanger by 3-5 m.
Preferably, said step4) The middle and first stage fracturing construction is to adopt small-scale fracturing modification to construct and form first stage cracks, wherein the half length of the first stage cracks formed by fracturing is smaller than one half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20 square, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
Preferably, the temporary plugging of the first-stage cracks in the step 5) is to inject a multi-particle size combined soluble temporary plugging agent into the small displacement, and temporarily plug the first-stage cracks formed in the step 4), wherein the multi-particle size combined soluble temporary plugging agent can be stacked and bridged at the perforation holes and the cracks close to the well casing, so that temporary plugging of the cracks is realized, fracturing liquid is prevented from continuously entering, the risk of water breakthrough caused by excessive growth of the first-stage cracks is prevented, and then the construction pressure is increased to crack the second-stage cracks.
Preferably, the small discharge capacity is 0.5-1.0 m3The injection liquid is guanidine gum base liquid; the increased construction pressure is that the construction pressure is increased by 3-5 MPa, so that the secondary crack is promoted to crack and is accompanied with obvious fracture pressure.
Preferably, the temporary plugging agent with the multi-particle size combination dissoluble temporary plugging agent is prepared by mixing temporary plugging agents with the sizes of 1mm, 2mm and 4mm, wherein the temporary plugging agent with the size of 1mm accounts for 10 wt%, the temporary plugging agent with the size of 2mm accounts for 40 wt%, and the temporary plugging agent with the size of 4mm accounts for 50 wt%, and the temporary plugging agent with the multi-particle size combination dissoluble temporary plugging agent can be dissolved for more than 90% in 48 hours at the temperature of a shaft.
Compared with the prior art, the invention has the advantages that:
(1) according to the method, the oil reservoir is developed by injecting water into the ultra-low permeability sandstone, and the horizontal section of the sidetracking horizontal well is arranged in the direction obliquely crossed to the maximum principal stress direction of the reservoir by optimizing the well arrangement mode, so that the length of the horizontal section is extended to the maximum extent, the number of the modification sections is increased, a waterline is avoided, and the construction efficiency is high; the formed cracks are temporarily blocked by adopting a multi-particle size combined soluble temporary blocking agent under the condition of a small-diameter perforation hole, the temporary blocking agent is automatically dissolved after the multi-stage fracturing construction is realized, and finally a plurality of independent cracks are formed, so that the drainage area is enlarged, and the aim of improving the yield of a single well is fulfilled;
(2) according to the sidetracking horizontal well arranged in the invention, the horizontal section of the shaft does not pass through the waterline, so that the optimal horizontal section length under the well pattern condition is realized, the number of fracture sections is increased, the reservoir exploitation range is increased, and the water breakthrough risk is reduced; meanwhile, perforation transformation is carried out on a low-water-washing layer section, namely a residual oil enrichment section, a strong water-washing section is avoided, the distance between perforation sections is shortened, the number of cracks is increased, the contact area between the cracks and the reservoir is increased, and residual oil is fully used;
(3) the fracturing string with single upper seal is adopted, the pressure bearing of an old well casing is avoided, the construction risk is low, the temporary plugging agent can be dissolved by adopting targeted multi-particle-size combination, the temporary plugging success rate of small-diameter perforation holes and near well casing cracks is improved, infinite pole number fracturing construction is realized, the tool cost is low, only one fracturing drilling tool is needed, and the construction efficiency is high.
(4) The method has the advantages of low cost, long horizontal section of the sidetrack horizontal well, high utilization rate of the horizontal section, communication between multiple sections of cracks and the reservoir, large drainage area and obvious yield increasing effect, and provides a technical reference for improving the productivity of the oil well, using the residual oil and improving the recovery ratio of the sidetrack horizontal well of the same type of oil reservoir in the medium-high water cut period.
Drawings
FIG. 1 is a horizontal section design diagram of a sidetracking horizontal well in an embodiment 8 of the invention;
FIG. 2 is a schematic diagram of a single upper seal fracturing string structure and a sidetrack horizontal well bore of the present invention.
1-tubing adjusting short section, 2-variable buckle, 3-restrictor, 4-packer, 5-hydraulic anchor, 6-fracturing tubing, 7-reservoir casing, 8-liner hanger, 9-3 inch semi-reservoir casing, 10-well cement and 11-horizontal section perforation hole.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other embodiments disclosed herein are illustrative only and are not intended to limit the scope of the invention, which is defined by the claims, since the scope of the invention is not limited by the specific structures, proportions, and dimensions, or otherwise, unless otherwise specified, since various modifications, changes in the proportions and variations thereof, can be made by those skilled in the art without departing from the spirit and scope of the invention.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The logging described in the present invention is interpreted as existing data.
Example 1
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Example 2
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Example 3
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the maximum main stress direction of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Example 4
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the direction of the maximum main stress of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Preferably, as shown in fig. 2, the step 3) of setting the single upper sealing fracturing string in the vertical well casing section means that the single upper sealing fracturing string is set in the vertical well section of the oil layer casing 7 of the water flooded well through the fracturing oil pipe 6, wherein the single upper sealing fracturing string is sequentially connected with the oil pipe adjusting short section 1, the variable buckle 2, the restrictor 3, the packer 4 and the hydraulic anchor 5 from bottom to top, wherein the packer 4 is a K344 packer, the upper end of the hydraulic anchor 5 is connected with the fracturing oil pipe 6, and the packer 4 is located in a 3-inch half oil layer casing 9 and is located 3-5 m below the tail pipe hanger 8.
Example 5
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the direction of the maximum main stress of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Preferably, as shown in fig. 2, the step 3) of setting the single upper sealing fracturing string in the vertical well casing section means that the single upper sealing fracturing string is set in the vertical well section of the oil layer casing 7 of the water flooded well through the fracturing oil pipe 6, wherein the single upper sealing fracturing string is sequentially connected with the oil pipe adjusting short section 1, the variable buckle 2, the restrictor 3, the packer 4 and the hydraulic anchor 5 from bottom to top, wherein the packer 4 is a K344 packer, the upper end of the hydraulic anchor 5 is connected with the fracturing oil pipe 6, and the packer 4 is located in a 3-inch half oil layer casing 9 and is located 3-5 m below the tail pipe hanger 8.
Preferably, the first-stage fracturing construction in the step 4) is implemented by small-scale fracturing modification to form first-stage cracks, wherein the half length of the first-stage cracks formed by fracturing is smaller than half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20 square, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
Preferably, the temporary plugging of the first-stage cracks in the step 5) is to inject a multi-particle size combined soluble temporary plugging agent into the small displacement, and temporarily plug the first-stage cracks formed in the step 4), wherein the multi-particle size combined soluble temporary plugging agent can be stacked and bridged at the perforation holes and the cracks close to the well casing, so that temporary plugging of the cracks is realized, fracturing liquid is prevented from continuously entering, the risk of water breakthrough caused by excessive growth of the first-stage cracks is prevented, and then the construction pressure is increased to crack the second-stage cracks.
Example 6
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the direction of the maximum main stress of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Preferably, as shown in fig. 2, the step 3) of setting the single upper sealing fracturing string in the vertical well casing section means that the single upper sealing fracturing string is set in the vertical well section of the oil layer casing 7 of the water flooded well through the fracturing oil pipe 6, wherein the single upper sealing fracturing string is sequentially connected with the oil pipe adjusting short section 1, the variable buckle 2, the restrictor 3, the packer 4 and the hydraulic anchor 5 from bottom to top, wherein the packer 4 is a K344 packer, the upper end of the hydraulic anchor 5 is connected with the fracturing oil pipe 6, and the packer 4 is located in a 3-inch half oil layer casing 9 and is located 3-5 m below the tail pipe hanger 8.
Preferably, the first stage pressure in the step 4)The fracturing construction is to adopt small-scale fracturing modification to construct and form a first-stage crack, wherein the half length of the first-stage crack formed by fracturing is smaller than one half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20 square, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
Preferably, the temporary plugging of the first-stage cracks in the step 5) is to inject a multi-particle size combined soluble temporary plugging agent into the small displacement, and temporarily plug the first-stage cracks formed in the step 4), wherein the multi-particle size combined soluble temporary plugging agent can be stacked and bridged at the perforation holes and the cracks close to the well casing, so that temporary plugging of the cracks is realized, fracturing liquid is prevented from continuously entering, the risk of water breakthrough caused by excessive growth of the first-stage cracks is prevented, and then the construction pressure is increased to crack the second-stage cracks.
Preferably, the small discharge capacity is 0.5-1.0 m3The injection liquid is guanidine gum base liquid; the increased construction pressure is that the construction pressure is increased by 3-5 MPa, so that the secondary crack is promoted to crack and is accompanied with obvious fracture pressure.
Example 7
The invention discloses a 3-inch half-slim hole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps of:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
Preferably, as shown in fig. 2, the flooded oil well in step 1) is an angle well in the well drainage direction, wherein the flooded oil well can communicate with the water injection well at a later stage to form a waterline; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is formed by connecting a 3-inch half-layer casing 9 in an oil layer casing 7 of a water-flooded oil well through a tail pipe hanger 8, wherein the outer side of the 3-inch half-layer casing 9 is filled with well cementation cement 10, and the 3-inch half-layer casing 9 is arranged in the direction obliquely crossed to the maximum principal stress direction of a reservoir.
Preferably, the low water washing interval in the step 2) refers to a low water-bearing interval with the permeability of less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the direction of the maximum main stress of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
Preferably, as shown in fig. 2, the step 3) of setting the single upper sealing fracturing string in the vertical well casing section means that the single upper sealing fracturing string is set in the vertical well section of the oil layer casing 7 of the water flooded well through the fracturing oil pipe 6, wherein the single upper sealing fracturing string is sequentially connected with the oil pipe adjusting short section 1, the variable buckle 2, the restrictor 3, the packer 4 and the hydraulic anchor 5 from bottom to top, wherein the packer 4 is a K344 packer, the upper end of the hydraulic anchor 5 is connected with the fracturing oil pipe 6, and the packer 4 is located in a 3-inch half oil layer casing 9 and is located 3-5 m below the tail pipe hanger 8.
Preferably, the first-stage fracturing construction in the step 4) is implemented by small-scale fracturing modification to form first-stage cracks, wherein the half length of the first-stage cracks formed by fracturing is smaller than half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20 square, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
Preferably, the temporary plugging of the first-stage cracks in the step 5) is to inject a multi-particle size combined soluble temporary plugging agent into the small displacement, and temporarily plug the first-stage cracks formed in the step 4), wherein the multi-particle size combined soluble temporary plugging agent can be stacked and bridged at the perforation holes and the cracks close to the well casing, so that temporary plugging of the cracks is realized, fracturing liquid is prevented from continuously entering, the risk of water breakthrough caused by excessive growth of the first-stage cracks is prevented, and then the construction pressure is increased to crack the second-stage cracks.
Preferably, the small discharge capacity is 0.5-1.0 m3The injection liquid is guanidine gum base liquid; the increased construction pressure is that the construction pressure is increased by 3-5 MPa, so that the secondary crack is promoted to crack and is accompanied with obvious fracture pressure.
Preferably, the temporary plugging agent with the multiple particle size combinations is prepared by mixing temporary plugging agents with the sizes of 1mm, 2mm and 4mm, wherein the weight percentage of the temporary plugging agent with the size of 1mm is 10%, the weight percentage of the temporary plugging agent with the size of 2mm is 40%, and the weight percentage of the temporary plugging agent with the size of 4mm is 50%, wherein the temporary plugging agent with the multiple particle size combinations can be dissolved for more than 90% in 48h at the temperature of a shaft, and the temporary plugging agent is selected from the existing soluble temporary plugging agents which can be used for temporarily plugging cracks.
Example 8
The embodiment of the invention provides a fracturing method for a 3-inch semi-slim borehole of a sidetrack horizontal well of an ultra-low permeability sandstone reservoir, which comprises the following steps:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
as shown in fig. 1, a rhombic nine-point well pattern (comprising 4 injection and production well pattern units) is taken as an example, wherein the well spacing is 500m, the row spacing is 150m, and a water flooded well is an angular well in the well row direction, is communicated with a water injection well to form a water line, loses the productivity of the well, and is preferably an old well bore of a sidetrack horizontal well. Meanwhile, a horizontal section is preferably arranged in a direction obliquely crossed with the maximum principal stress direction of the reservoir, namely, an included angle formed by the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum principal stress direction of the reservoir is an acute angle, and the acute angle is about half of an included angle formed by a water logging oil well and a connecting line of an injection well and a production well in the injection well network unit and an oil well, so that the larger horizontal section length in the injection and production unit is realized, and a basis is provided for increasing perforation and fracturing modification sections (stages) later and improving the single well productivity.
The horizontal dotted line in fig. 1 is the direction of the maximum principal stress of the reservoir, or the direction of a water injection well row or the direction of a waterline; the black solid line is a shaft track of a horizontal section of the sidetrack horizontal well; the dotted hollow circle is a water-flooded oil well or an angle well; the black solid circle is a normally produced oil well; the black triangle is a water injection well.
Step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
the low washing layer section is mainly a logging interpretation permeability section with the water content less than 1 MD; meanwhile, perforating by using a perforating gun with a small diameter of 54mm and an inner diameter of 76mm in a 3-inch half shaft, and preferably, according to the principle that the crack extends along the direction of the maximum principal stress, the perforating direction is parallel to the direction of the maximum principal stress of the reservoir; the phase of the perforating gun adopts 180 degrees, the number of perforating sections is more than 5 sections, the minimum distance between perforating sections can be less than 30m, and as shown in figure 2, a horizontal section perforating hole 11 is a hole for perforating by the perforating gun.
Step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
as shown in figure 2, a single upper-seal fracturing string is communicated with and goes into a 3-inch semi-oil layer casing 9 through a fracturing oil pipe 6, the single upper-seal fracturing string is sequentially connected with an oil pipe adjusting short joint 1, a variable buckle 2, a throttler 3, a K344 packer 4 and a hydraulic anchor 5 from bottom to top, the single upper-seal fracturing string is seated and sealed by hydraulic pressurization in the oil pipe in the fracturing process, wherein the packer is located in the 3-inch semi-oil layer casing 9 and is 3-5 m below the K344 packer 4, and protection of an old borehole oil layer casing 7 is achieved.
Step 4), performing first-stage fracturing construction;
simulating and optimizing construction of corresponding stages through fracturing professional software according to the number of perforation stages, wherein each stage is constructed by small-scale fracturing modification, the half length of a fracture formed by fracturing is smaller than half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20 square, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
Step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
using a particle size of 0.5-1.0 m3Injecting a multi-particle-size combined soluble temporary plugging agent carried by a guanidine gum base fluid into the small displacement per minute to temporarily plug the first-stage crack, and raising the construction pressure by 3-5 MPa to crack the second-stage crack; the temporary plugging agent with the size of 1mm, 2mm and 4mm is dissolved in multiple particle size combinations, is mixed according to the proportion of 10 percent, 40 percent and 50 percent, and is dissolved for more than 90 percent in 48 hours under the condition of the temperature of a shaft.
This step has mainly 3 purposes: firstly, the temporary plugging agent can be dissolved by injecting the small-displacement multi-particle size combination, so that the temporary plugging agent can be stacked and bridged near the perforation hole with the formed crack more easily, the subsequent fracturing fluid is prevented from entering, and the water breakthrough risk caused by overlong crack is prevented; secondly, the particle size of the multi-particle-size combined soluble temporary plugging agent is suitable for the size of perforation holes of 6-8 mm, the temporary plugging success rate of the plugging agent is high, and the liquid flow direction can be forced to turn to other perforation holes and generate new cracks; and thirdly, temporary plugging and boosting can overcome stress difference between sections, promote new cracks to form and initiate, and play a role in starting and stopping for forming a plurality of independent cracks and developing subsequent fracturing.
Step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and (5) repeating the step 4) and the step 5), finishing the construction of all perforation sections, and finally forming a plurality of independent cracks.
Step 7), closing the well, releasing the blowout, and taking out the single upper sealed fracturing pipe column for re-production;
and closing the well for more than 48 hours to fully dissolve the temporary plugging agent, then opening the well for open flow, pulling out the single upper sealing fracturing string, and recovering production.
The method of the invention is used for carrying out 6-well field tests in old oil fields, the daily oil production of a single well at the initial production stage is 3.33 tons, the comprehensive water content is 60.2 percent, and the current 2.79t is 2.8 times of that of a peripheral directional well, which shows that the residual oil is obviously used.
The principle of the invention is as follows:
as shown in figures 1-2, the invention is characterized in that an oil reservoir is developed by water injection in ultra-low permeability sandstone, a well distribution mode is optimized, namely, a horizontal section of a sidetracking horizontal well is arranged in the direction obliquely intersecting the maximum principal stress of a reservoir, wherein the angle between the direction of the horizontal section and the direction of the maximum principal stress of the reservoir is half of the included angle formed by a water logging well and the connecting line of the water logging well and an oil well in an injection and production well network unit respectively, a 3-inch sidetracking half oil layer casing 9 is connected in an oil layer casing 7 of the water logging well through a tail pipe hanger 8, the outer side of the 3-inch half oil layer casing 9 of the sidetracking well is filled with well cement 10, the 3-inch half oil layer casing 9 of the sidetracking well is arranged in the direction obliquely intersecting the maximum principal stress of the reservoir to form a horizontal section of the sidetracking horizontal well, the horizontal section is; then, perforation transformation is carried out on the low-water-washing layer section, namely the residual oil enrichment section, the strong-water-washing section is avoided, the interval of the perforation section is shortened, the number of cracks is increased, the contact area between the cracks and the reservoir is increased, and the residual oil is fully used; then, a single upper sealing fracturing string is put into a vertical well barrel section of the water flooded oil well, the single upper sealing fracturing string is put into a vertical well section of an oil layer casing 7 of the water flooded oil well through a fracturing oil pipe 6, wherein the single upper sealing fracturing string is sequentially connected with an oil pipe adjusting short section 1, a variable buckle 2, a throttle 3, a packer 4 and a hydraulic anchor 5 from bottom to top, the upper end of the hydraulic anchor 5 is connected with the fracturing oil pipe 6, and the packer 4 is positioned in a side drilling 3-inch half oil layer casing 9 and is positioned at the lower side of a tail pipe hanger 8 by 3-5 m; then, performing first-stage fracturing construction, adding a temporary plugging agent to perform first-stage fracture temporary plugging, temporarily plugging the formed fracture by adopting a multi-particle size combination soluble temporary plugging agent under the condition of a small-diameter perforation hole, and automatically dissolving the temporary plugging agent after the multi-stage fracturing construction is realized; repeating fracturing construction and temporary plugging of cracks to complete fracturing construction of all stages; finally, a plurality of independent cracks are formed, the drainage area is enlarged, and the purpose of improving the yield of a single well is achieved.
According to the sidetracking horizontal well arranged in the invention, the horizontal section of the shaft does not pass through the waterline, so that the optimal horizontal section length under the well pattern condition is realized, the number of fracture sections is increased, the reservoir exploitation range is increased, and the water breakthrough risk is reduced; meanwhile, the fracturing string is sealed on the single upper sealing layer, pressure bearing of an old well casing is avoided, construction risk is low, the temporary plugging agent can be dissolved by targeted multi-particle-size combination, the temporary plugging success rate of small-diameter perforation holes and near well casing cracks is improved, infinite pole number fracturing construction is realized, tool cost is low, only one fracturing drilling tool is needed, and construction efficiency is high.
The method has the advantages of low cost, long horizontal section of the sidetrack horizontal well, high utilization rate of the horizontal section, communication between multiple sections of cracks and the reservoir, large drainage area and obvious yield increasing effect, and provides a technical reference for improving the productivity of the oil well, using the residual oil and improving the recovery ratio of the sidetrack horizontal well of the same type of oil reservoir in the medium-high water cut period.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (8)
1. A3-inch half-small borehole fracturing method for a sidetrack horizontal well of an ultra-low permeability sandstone reservoir is characterized by comprising the following steps:
step 1) arranging a sidetrack horizontal well horizontal section in a direction obliquely crossing the maximum main stress direction of a reservoir by using a water-flooded well shaft;
step 2) carrying out multi-section perforation on a low water-washing layer section of the contralateral drilled horizontal well;
step 3) putting a single upper sealing fracturing pipe column into a vertical well barrel section of the water flooded oil well;
step 4), performing first-stage fracturing construction;
step 5) adding a temporary plugging agent to perform primary crack temporary plugging;
step 6) repeating the step 4) and the step 5) to finish the fracturing construction of all stages;
and 7) closing the well, releasing the well, and taking out the single upper sealed fracturing string for re-production.
2. The fracturing method of 3 inches of a half-slim hole of a sidetrack horizontal well of an ultra-low permeability sandstone reservoir according to claim 1, wherein the flooded well in the step 1) is an angle well in the well-row direction, and the flooded well can be communicated with a water injection well at the later stage to form a water line; the included angle formed by the direction obliquely intersected with the maximum main stress direction of the reservoir, namely the shaft direction of the horizontal section of the sidetracking horizontal well and the maximum main stress direction of the reservoir is an acute angle, wherein the maximum main stress direction of the reservoir is the waterline direction, and the angle of the acute angle is half of the included angle formed by the connection line of a water logging well and an injection and production well network unit and an oil well, so that a longer horizontal section can be obtained, and the number of fracture sections is increased; the horizontal section of the sidetracking horizontal well is arranged, namely, the horizontal section of the sidetracking horizontal well is connected with a 3-inch semi-oil layer casing (9) in an oil layer casing (7) of a water-flooded oil well through a tail pipe hanger (8), wherein well cement (10) is filled outside the 3-inch semi-oil layer casing (9), and the 3-inch semi-oil layer casing (9) is arranged along the direction obliquely crossed with the maximum main stress of a reservoir layer to form the horizontal section of the sidetracking horizontal well.
3. The ultra-low permeability sandstone reservoir sidetracking horizontal well 3-inch semi-slim well fracturing method according to claim 1, wherein the low-water-wash interval in the step 2) is a low-water-cut interval with permeability less than 1mD in well logging interpretation; the multi-section perforation is implemented by adopting oil pipe transmission, the distance between perforation sections is less than or equal to 30m, the number of perforation sections is more than 5, the perforation thickness of each section is 5m, the perforation direction is parallel to the maximum main stress direction of the reservoir, the phase of the perforating gun is 180 degrees, and the diameter of the perforating gun is 54 mm.
4. The 3-inch semi-slim hole fracturing method for sidetracking of the horizontal well in the ultra-low permeability sandstone reservoir is characterized in that the step 3) of setting the single-top-sealed fracturing string in the vertical well casing section is that the single-top-sealed fracturing string is set in the vertical well section of the oil layer casing (7) of the water-flooded well through the fracturing oil pipe (6), wherein the single-top-sealed fracturing string is sequentially connected with the oil pipe adjusting short joint (1), the variable buckle (2), the choke (3), the packer (4) and the hydraulic anchor (5) from bottom to top, the packer (4) is a K344 packer, the upper end of the hydraulic anchor (5) is connected with the fracturing oil pipe (6), and the packer (4) is located in the 3-inch semi-oil layer casing (9) and is located 3-5 m below the tail pipe hanger (8).
5. The 3-inch semi-slim hole fracturing method for sidetracking horizontal well of ultra-low permeability sandstone reservoir, according to claim 2, characterized in that the first-stage fracturing construction in the step 4) is a small-scale fracturing modification construction, wherein the first-stage fracture is formed by fracturing, the half length of the first-stage fracture is less than half of the well pattern row spacing, the sand amount of the small-scale fracturing modification is 15-20, and the discharge capacity is 1.0-1.6 m3The liquid amount is 80-150 square per minute.
6. The ultra-low permeability sandstone reservoir sidetracking horizontal well 3-inch semi-slim well fracturing method according to claim 5, wherein the temporary plugging of the first-stage fracture in the step 5) is to inject a multi-particle size combined soluble temporary plugging agent with small displacement, and temporarily plug the first-stage fracture formed in the step 4), wherein the multi-particle size combined soluble temporary plugging agent can be stacked and bridged at a perforation and a near-well-barrel fracture to realize temporary plugging of the fracture, prevent fracturing liquid from continuously entering, prevent the first-stage fracture from excessively growing to bring water-break risk, and then raise construction pressure to crack the second-stage fracture.
7. The ultra-low permeability sandstone reservoir sidetracking horizontal well 3-inch semi-slim well fracturing method according to claim 6, wherein the small displacement is 0.5-1.0 m3The injection liquid is guanidine gum base liquid; the increased construction pressure is that the construction pressure is increased by 3-5 MPa, so that the secondary crack is promoted to crack and is accompanied with obvious fracture pressure.
8. The fracturing method of the 3-inch semi-slim well of the sidetracking horizontal well of the ultra-low permeability sandstone reservoir, according to claim 6, is characterized in that the temporary plugging agent with the combination of the multiple particle sizes is obtained by mixing temporary plugging agents with the sizes of 1mm, 2mm and 4mm, wherein the temporary plugging agent with the size of 1mm is 10 wt%, the temporary plugging agent with the size of 2mm is 40 wt%, and the temporary plugging agent with the size of 4mm is 50 wt%, wherein the temporary plugging agent with the combination of the multiple particle sizes can be dissolved for more than 90% within 48h under the condition of wellbore temperature.
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| CN112855106A (en) * | 2021-01-21 | 2021-05-28 | 西南石油大学 | Construction method for solid temporary plugging agent steering fracturing |
| CN115217414A (en) * | 2021-04-21 | 2022-10-21 | 中国石油化工股份有限公司 | Method and device for determining vertical well excavation process, storage medium and electronic equipment |
| CN115711113A (en) * | 2021-08-23 | 2023-02-24 | 中国石油天然气股份有限公司 | Efficient fracturing method for sidetrack short horizontal well |
| CN115711113B (en) * | 2021-08-23 | 2024-09-20 | 中国石油天然气股份有限公司 | Efficient fracturing method for sidetrack short horizontal well |
| CN117072134A (en) * | 2023-10-19 | 2023-11-17 | 中国煤炭地质总局勘查研究总院 | Large-scale volume fracturing method for deep stratum horizontal well |
| CN117072134B (en) * | 2023-10-19 | 2024-02-06 | 中国煤炭地质总局勘查研究总院 | Large-scale volume fracturing method for deep stratum horizontal well |
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