CN107956463B - Ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000035699 permeability Effects 0.000 title claims abstract description 29
- 238000005086 pumping Methods 0.000 claims description 41
- 239000003292 glue Substances 0.000 claims description 35
- 239000004576 sand Substances 0.000 claims description 34
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000003129 oil well Substances 0.000 abstract description 7
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 19
- 238000013461 design Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention provides an ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method, which comprises the following steps: firstly, carrying out primary volume fracturing on a shaft of a target reservoir stratum to form a main crack extending along the direction of the maximum main stress and peripheral secondary reticular cracks thereof, and temporarily blocking the main crack; and then, carrying out second volume fracturing on the shaft of the target reservoir, wherein after the first volume fracturing, the maximum main stress field in a certain range around the shaft is overturned by approximately 90 degrees, so that a secondary main crack which is approximately vertically intersected with the main crack can be constructed through the second volume fracturing, and a reticular crack is formed around the secondary main crack. The method can be used for constructing the omnibearing three-dimensional reticular cracks in the vertical well by fracturing, greatly improves the reconstruction volume of the oil well and improves the productivity of the oil well.
Description
Technical Field
The invention relates to the field of oil extraction, and relates to an ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method.
Background
Along with the further increase of the development of oil and gas resources, the newly-discovered ultra-low permeability oil and gas reservoir increases year by year, and the fracturing modification of the ultra-low permeability oil and gas reservoir becomes a main position for increasing the yield of oil and gas, wherein the ultra-low permeability reservoir refers to × 10 with the average permeability of an oil layer being 1.1-10.0-3μm2. The difference between the oil layer and the normal oil layer is obvious, the saturation of the general bound water is increased, the logging resistivity is reduced, the normal test can not reach the industrial oil flow standard, and the large-scale fracturing modification and other corresponding measures are required to be adopted to effectively put into industrial development. Thus, fracturing is gaining increasing attention as a major stimulation measure for such reservoirs.
The fracturing operation is to utilize pumping liquid to fracture the stratum, pump in the liquid carrying proppant, discharge the liquid after the stratum is closed, finally form the fracture with conductivity, increase the draining area, reach the purpose of improving the seepage flow ability of the reservoir bed, improve the oil well productivity. For years, fracturing operation in the conventional low-permeability reservoir transformation process has achieved a relatively ideal effect. But as the production of the ultra-low permeability reservoir progresses, the post-fracturing effect of the conventional fracturing reformation mode is difficult to meet the production requirement. The reason is mainly shown in that the ultra-low permeability reservoir matrix has poor seepage capability, and the same fracture is established as the conventional reservoir, and the productivity of the ultra-low permeability reservoir matrix is far smaller than that of the conventional low permeability reservoir matrix as shown in formula (1).
Wherein K is the formation permeability, D; h is the oil layer thickness m; pRBoundary pressure, Mpa; pwfBottom hole flowing pressure, Mpa; mu, B is fluid viscosity, crude oil volume coefficient, mPa.s, dimensionless; sf: a fissure epidermal factor; r ise，xf: radius of leakage, half-length of crack; cfD: dimensionless fracture conductivity, CfD＝KfWf/KXfIn which K isfFor fracture conductivity, WfIs the slit width.
Therefore, people begin to seek a new fracturing method, two technologies are introduced and applied to ultra-low permeability exploitation in China, one technology is horizontal well multistage staged fracturing, the single well productivity is really improved, but the drilling cost and the later stage fracturing cost are high, and the aim of economic exploitation is difficult to achieve; one is volume fracturing, and the fracturing method improves and builds reticular cracks by reforming so as to avoid adverse factors of poor matrix seepage and improve productivity, but an important condition for realizing volume fracturing is that the difference between the horizontal maximum principal stress and the minimum principal stress is small, but oil wells in China are generally deeply buried, the horizontal principal stress difference is large, and omnibearing three-dimensional reticular cracks are difficult to form, so that the method is not widely applied to vertical well mode mining operation. The mode of horizontal well multistage staged fracturing and volume fracturing can achieve better effect, but the cost problem is still an important factor for restricting wide application.
In conclusion, it is very important to develop an economically feasible novel fracturing method for ultra-low permeability reservoirs.
Disclosure of Invention
The invention aims to realize effective and economic exploitation of an ultra-low permeability reservoir and provides an economical and feasible vertical well omnibearing three-dimensional fracturing method.
The technical scheme adopted by the invention is as follows.
An ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps:
firstly, carrying out primary volume fracturing on a shaft of a target reservoir stratum to form a main crack extending along the direction of the maximum main stress and peripheral secondary reticular cracks thereof, and temporarily blocking the main crack;
and then, carrying out second volume fracturing on the shaft of the target reservoir, wherein after the first volume fracturing, the maximum main stress field in a certain range around the shaft is overturned by approximately 90 degrees, so that a secondary main crack which is approximately vertically intersected with the main crack can be constructed through the second volume fracturing, and a reticular crack is formed around the secondary main crack, thereby greatly improving the seepage control area.
Further, the ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps:
the method comprises the following steps: performing perforation operation on the target reservoir;
step two: a fracturing pipe column is lowered, and a packer is set;
step three: testing pressure;
step four: pumping a front hydraulic formation and creating a main crack;
step five: pumping slickwater for volume fracturing and adding sand;
step six: pumping glue solution into the main crack for adding sand into the main crack;
step seven: stopping the pump, measuring the pressure and discharging the liquid;
step eight: pumping glue solution added with a soluble temporary plugging agent to plug the crack;
step nine: repeating the fourth step to the sixth step, namely pumping a front hydraulic fracturing stratum and creating a secondary main crack, pumping slickwater for volume fracturing and sand adding, and pumping glue solution for secondary main crack sand adding;
step ten: closing the well and discharging liquid.
Further, in the first step, the perforation azimuth angle of the perforation operation is 90 degrees, the hole distribution mode is spiral hole distribution, and the hole density is 10-16 holes/m.
Further, in the fourth step, the pre-solution is a glue solution, the ground viscosity of the glue solution is more than 300mpa.s, and the ground viscosity is 170s at the reservoir temperature-1Viscosity greater than 50mpa.s at shear rate for 2 hours.
Further, in the fifth step, the viscosity of the slick water is 5-10 mpa.s, and the discharge capacity is 5m3/min-8m3Min, the particle size of the proppant is 40/70 meshes or 30/60 meshes, and the sand ratio is 3-8%. Proppant size may be either 40/70 mesh or 30/60 mesh smaller size proppant, differing in the application of different formation conditions.
Further, in the sixth step, the particle size of the proppant in the glue solution is 30/60 meshes or 20/40 meshes, and the sand ratio is 5% -50%. The particle size of the proppant is 30/60 meshes or 20/40 meshes.
Further, in step seven, the pump down time is greater than the fracture closure time.
Further, in the eighth step, the soluble temporary plugging agent can better plug cracks, and is dissolved in water or oil after fracturing.
Furthermore, the pressure resistance of the soluble temporary plugging agent is more than 80MPa, and the dissolving time in oil is less than 24 hours.
Further, in the eighth step, before the glue solution added with the soluble temporary plugging agent is pumped to plug the crack, the step of open flow is also included.
The method has the basic principle that the trend of the fracturing crack depends on the size and the direction of a ground stress field, the crack extends along the direction of the maximum main stress, the internal stress field changes within a certain range at the periphery of a shaft after the crack is formed, particularly the direction of the maximum main stress is reversed by nearly 90 degrees, the characteristic of stress reversal after the fracture is utilized, after the first fracturing, the first crack is temporarily blocked, the second fracturing is carried out, a second crack is constructed in the direction vertical to the first crack, so that two vertically intersected cracks on a plane are formed, a volume fracturing mode is adopted in the two fracturing processes, a seam network is created at the periphery of the main crack, and the transformation seepage control area is greatly increased.
Compared with the prior art, the invention has the advantages that: omnibearing volume fracturing is carried out on the basis of a vertical well, and high drilling cost and fracturing tool cost of horizontal well multistage staged fracturing are avoided; a secondary main crack is created on the basis of a single main crack, and a secondary crack is generated on the basis of the main crack, so that the oil drainage area and the transformation volume are greatly improved compared with the prior art.
Drawings
FIG. 1 is a schematic top view of a fracture formed by the ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method provided by the invention.
FIG. 2 is a process flow diagram of a vertical well omnibearing three-dimensional fracturing method for an ultra-low permeability reservoir provided in example 2 of the present invention.
Fig. 3 is a process flow chart of the ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method provided in embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1. An ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps: as shown in fig. 1, performing a first volume fracturing in a vertical well 23 of a target reservoir to form a main fracture 21 extending along a direction of maximum main stress and a secondary reticular fracture 22, and temporarily blocking the main fracture 21; and performing second volume fracturing on the shaft of the target reservoir, wherein after the first volume fracturing, the maximum main stress field in a certain range around the shaft is overturned by approximately 90 degrees, so that a secondary main crack 24 which is approximately vertically intersected with the main crack 21 can be constructed through the second volume fracturing, and a reticular crack 25 is formed around the secondary main crack. The network slits 22 and 25 are not formed simultaneously, and the secondary network slits 22 and the network slits 25 are criss-cross, so that the seepage control area can be greatly improved.
Example 2. An ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps:
the method comprises the following steps: performing perforation operation on the target reservoir; the perforation azimuth angle of perforation operation is 90 degrees, the hole distribution mode is spiral hole distribution, and the hole density is 13 holes/m.
Step two: a fracturing pipe column is lowered, and a packer is set;
step three: testing pressure;
step four: pumping a front hydraulic formation and creating a main crack; the pad fluid is a glue solution, the ground viscosity of the glue solution is more than 300mpa.s, and the viscosity is 170s at the reservoir temperature-1Viscosity greater than 50mpa.s at shear rate for 2 hours.
Step five: pumping slickwater for volume fracturing and adding sand; the slickwater has viscosity of 7mpa.s and discharge capacity of 6m3Min, the particle size of the propping agent is 40/70 meshes, and the sand ratio is 3-5%. The sand ratio varies from small to large during the fracturing process.
Step six: pumping glue solution into the main crack for adding sand into the main crack; the particle size of the propping agent in the glue solution is 20/40 meshes, and the sand ratio is 7-45%. The sand ratio varies from small to large during the fracturing process.
Step seven: stopping the pump, measuring the pressure and discharging the liquid. The pump down time is greater than the fracture closure time.
Step eight: and pumping glue solution added with a soluble temporary plugging agent to plug the cracks. The soluble temporary plugging agent can better plug cracks, and is dissolved in water or oil after fracturing is finished. The pressure resistance of the soluble temporary plugging agent is more than 80MPa, and the dissolving time in oil is less than 24 hours.
Step nine: and repeating the fourth step to the sixth step, namely pumping the pre-hydraulic fracturing stratum and creating a secondary main fracture, pumping slickwater for volume fracturing and sand adding, and pumping glue solution for secondary main fracture sand adding.
Step ten: closing the well and discharging liquid.
The embodiment provides an ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method, which comprises the following steps: firstly, carrying out primary volume fracturing on a shaft of a target reservoir stratum to form a main crack extending along the direction of the maximum main stress and peripheral secondary reticular cracks thereof, and temporarily blocking the main crack; and then, carrying out second volume fracturing on the shaft of the target reservoir, wherein after the first volume fracturing, the maximum main stress field in a certain range around the shaft is overturned by approximately 90 degrees, so that a secondary main crack which is approximately vertically intersected with the main crack can be constructed through the second volume fracturing, and a reticular crack is formed around the secondary main crack. The method can be used for constructing the omnibearing three-dimensional reticular cracks in the vertical well by fracturing, greatly improves the reconstruction volume of the oil well and improves the productivity of the oil well.
Example 3. An ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps: the method comprises the following steps: performing perforation operation on the target reservoir; step two: a fracturing pipe column is lowered, and a packer is set; step three: testing pressure; step four: pumping a glue solution preposed hydraulic ground layer and creating a main crack; step five: pumping slickwater for volume fracturing and adding sand; step six: pumping glue solution into the main crack for adding sand into the main crack; step seven: stopping the pump, measuring the pressure and discharging the liquid; step eight: pumping glue solution, and adding a soluble temporary plugging agent to plug cracks; step nine: repeating the fourth step to the sixth step; step ten: closing the well and discharging liquid. By the method, two main cracks which are vertically crossed can be formed at the periphery of the shaft, and on the basis, a crack net taking the main cracks as a main line is formed, so that the transformation degree is greatly improved, and the economic production increase of the oil well is realized.
Example 4. An ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method comprises the following steps:
the method comprises the following steps: performing perforation operation on the target reservoir; the perforation azimuth angle of the perforation operation is 90 degrees, the hole distribution mode is spiral hole distribution, and the hole density is 15 holes/m.
Step two: a fracturing pipe column is lowered, and a packer is set;
step three: testing pressure;
step four: pumping a front hydraulic formation and creating a main crack; the pad fluid is a glue solution, the ground viscosity of the glue solution is more than 300mpa.s, and the viscosity is 170s at the reservoir temperature-1Viscosity greater than 50mpa.s at shear rate for 2 hours.
Step five: pumping slickwater for volume fracturing and adding sand; the viscosity of the slickwater is 8mpa.s, the discharge capacity is 7m3/min, the particle size of the proppant is 30/60 meshes, and the sand ratio is 3-7%. The sand ratio typically varies from small to large during the fracturing process.
Step six: pumping glue solution into the main crack for adding sand into the main crack; the particle size of the propping agent in the glue solution is 30/60 meshes, and the sand ratio is 5-40%. The sand ratio typically varies from small to large during the fracturing process.
Step seven: stopping the pump, measuring the pressure and discharging the liquid. The pump down time is greater than the fracture closure time.
Step eight: and (4) open blowing. And pumping glue solution added with a soluble temporary plugging agent to plug the cracks. The soluble temporary plugging agent can better plug cracks, and is dissolved in water or oil after fracturing is finished. The pressure resistance of the soluble temporary plugging agent is more than 80MPa, and the dissolving time in oil is less than 24 hours.
Step nine: and repeating the fourth step to the sixth step, namely pumping the pre-hydraulic fracturing stratum and creating a secondary main fracture, pumping slickwater for volume fracturing and sand adding, and pumping glue solution for secondary main fracture sand adding.
Step ten: closing the well and discharging liquid.
Example 5. The example provides an ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method, as shown in fig. 2, the fracturing method comprises the following steps:
the implementation step one: carrying out perforation on the fracturing target, wherein the azimuth angle is 90 degrees, holes are distributed spirally, the hole density is 16 holes/meter, and the fracturing target is conveyed by adopting an oil pipe;
and the implementation step two: drifting, scraping a pipe, washing a well, pressing and cracking a pipe string, and setting a packer;
and the implementation step three: installing a fracturing wellhead, connecting a manifold and testing pressure;
the implementation step four: pumping glue solution into the main seam for pre-fluid stage fracturing, wherein the viscosity of the cross-linking solution is greater than 300mpa.s, and the design amount meets the design requirement of the main seam;
the implementation step five: pumping slick water to perform fracture network fracturing, wherein the liquid viscosity is 10mpa.s, and the discharge capacity is 6m3Min, the sand ratio is 3% -8%, and the particle size of the propping agent is 40/70 meshes;
the implementation step six: pumping glue solution into the fracture for filling the main fracture, wherein the viscosity of the cross-linking solution is more than 300mpa.s, and the particle size of the propping agent is 20/40 meshes for replacement;
the implementation step seven: stopping the pump, and measuring the pressure until the crack is closed;
and the implementation step eight: pumping glue solution, carrying a soluble temporary plugging agent to perform seam plugging, wherein the pressure resistance of the temporary plugging agent is more than 80MPa, and the dissolving time in water is less than 24 hours;
the implementation step nine: repeating the fourth step to the sixth step, and performing second volume fracturing;
the implementation step ten: closing the well and discharging liquid.
Example 6. The example provides an all-directional three-dimensional fracturing method for a vertical well of an ultra-low permeability reservoir, and referring to fig. 3, the fracturing method comprises the following steps:
the implementation step one: carrying out perforation on the fracturing target, wherein the azimuth angle is 90 degrees, holes are distributed spirally, the hole density is 10 holes/m, and the holes are conveyed by adopting a cable;
and the implementation step two: drifting, scraping a pipe, washing a well, and putting a fracturing string;
and the implementation step three: installing a fracturing wellhead, connecting a manifold and testing pressure;
the implementation step four: pumping glue solution into the main seam for pre-fluid stage fracturing, wherein the viscosity of the cross-linking solution is greater than 300mpa.s, and the design amount meets the design of the main seam;
the implementation step five: pumping slick water to perform fracture network fracturing, wherein the discharge capacity is 7m3Min, the sand ratio is 3% -8%, and the particle size of the propping agent is 30/60 meshes;
the implementation step six: pumping glue solution into the fracture for filling the main fracture, wherein the viscosity of the cross-linking solution is more than 300mpa.s, and the particle size of the propping agent is 20/40 meshes for replacement;
the implementation step seven: stopping the pump, and measuring the pressure to cause the crack to close;
and the implementation step eight: open-flow, open-flow according to the design requirement;
the implementation step nine: pumping glue solution, carrying a soluble temporary plugging agent to perform seam plugging, wherein the pressure resistance of the temporary plugging agent is more than 80MPa, and the dissolving time in oil is less than 24 hours;
the implementation step ten: and repeating the fourth step to the sixth step, and performing the second volume fracturing.
The implementation step eleven: closing the well and discharging liquid.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (1)
1. A vertical well omnibearing three-dimensional fracturing method of an ultra-low permeability reservoir is characterized in that firstly, first volume fracturing is carried out on a well shaft of a target reservoir to form a main fracture extending along the direction of the maximum main stress and a secondary network fracture around the main fracture, and the main fracture is temporarily blocked; then, carrying out second volume fracturing on the shaft of the target reservoir, and constructing a secondary main crack which is approximately vertically intersected with the main crack and forms a reticular crack on the periphery of the secondary main crack due to the fact that the maximum main stress field in a certain range of the periphery of the shaft after the first volume fracturing is approximately 90-degree turned, so that the seepage control area is greatly improved;
the method comprises the following steps:
step 1: performing perforation operation on the target reservoir;
step 2: a fracturing pipe column is lowered, and a packer is set;
and step 3: testing pressure;
and 4, step 4: pumping a front hydraulic formation and creating a main crack;
and 5: pumping slickwater for volume fracturing and adding sand;
step 6: pumping glue solution into the main crack for adding sand into the main crack;
and 7: stopping the pump, measuring the pressure and discharging the liquid;
and 8: pumping glue solution added with soluble temporary plugging agent to plug the seam of the main crack;
and step 9: repeating the fourth step to the sixth step, namely pumping a front hydraulic fracturing stratum and creating a secondary main crack, pumping slickwater for volume fracturing and sand adding, and pumping glue solution for secondary main crack sand adding;
step 10: closing the well and discharging liquid;
in the step 1, the perforation azimuth angle of the perforation operation is 90 degrees, the hole distribution mode is spiral hole distribution, and the hole density is 10-16 holes/m;
in step 4, the pre-solution is a glue solution, the ground viscosity of the glue solution is more than 300mpa.s, and the ground viscosity is 170s at the reservoir temperature-1Viscosity greater than 50mpa.s at shear rate for 2 hours;
in step 5, the viscosity of the slickwater is 5-10 mpa.s, and the discharge capacity is 5m3/min-8m3The grain size of the proppant is 40/70 meshes or 30/60 meshes, the sand ratio is 3% -8%, and the sand ratio is changed from small to large in the fracturing process;
in step 6, the particle size of the propping agent in the glue solution is 30/60 meshes or 20/40 meshes, the sand ratio is 5% -50%, and the sand ratio is changed from small to large in the fracturing process;
in step 7, the pump stopping time is longer than the main crack closing time;
in step 8, before the glue solution added with the soluble temporary plugging agent is pumped to plug the main crack seam, the step of open flow is also included;
the soluble temporary plugging agent can better plug a main crack seam, is dissolved in water or oil after fracturing is finished, has the pressure resistance of more than 80MPa, and has the dissolving time of less than 24 hours in oil.
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| CN111042790A (en) * | 2019-12-24 | 2020-04-21 | 中国石油大学(北京) | Repeated fracturing method and device |
| CN113669009B (en) * | 2020-05-13 | 2024-06-07 | 中国石油化工股份有限公司 | Method and system for decontaminating a reverse condensation zone of a target well |
| CN112983378B (en) * | 2021-03-24 | 2023-06-16 | 中国石油大学(华东) | Method for realizing balanced expansion and reinforced volume transformation of multi-main-seam three-dimensional fracturing of multi-radial well |
| CN113550728A (en) * | 2021-08-26 | 2021-10-26 | 中国石油大学(北京) | Temporary plugging evaluation method and device |
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