CN113833445A - Fracture oil reservoir transformation process - Google Patents
Fracture oil reservoir transformation process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 title claims abstract description 43
- 230000009466 transformation Effects 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000011156 evaluation Methods 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 17
- 238000012986 modification Methods 0.000 claims description 11
- 230000004048 modification Effects 0.000 claims description 11
- 238000013459 approach Methods 0.000 claims description 10
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 6
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000005192 partition Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention provides a fracture oil reservoir transformation process. A fracture reservoir reconstruction process comprising: setting a fracture parameter evaluation standard of the fractured reservoir; selecting a fractured oil reservoir and determining parameters of the fractured oil reservoir; comparing parameters of the fractured reservoir with fracture parameter evaluation standards of the fractured reservoir, and determining the side bottom water influence level and the complex hydraulic fracture forming condition level; determining a preset subarea of the fractured reservoir according to the side bottom water influence level and the formed complex hydraulic fracture condition level; and determining a reconstruction scheme of the fractured reservoir. The invention solves the problems of weak pertinence and low effectiveness of the fracture type edge and bottom water reservoir transformation process technology and parameter selection and poor convenience of scheme design in the prior art.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a fracture oil reservoir transformation process.
Background
The fracturing operation of oil and gas field is the most common technology for increasing production of oil and gas field at present, and is characterized by that it utilizes ground high-pressure pumping equipment to inject fracturing liquid into stratum to make stratum break and form a crack, then utilizes the propping agents of quartz sand and ceramsite, etc. and utilizes the fracturing liquid to pump into stratum together, and fills the formed crack, and establishes the channel for transferring oil and gas from far end of well to bottom of well so as to attain the goal of developing oil and gas of oil reservoir.
At present, the staged fracturing technology of the horizontal well becomes an effective development main technology in low-permeability and unconventional oil and gas reservoirs, and the process technology and parameter selection of staged fracturing of the horizontal well are key factors influencing whether the reservoir can be economically and reasonably reformed.
The fracture type side and bottom water reservoirs are common reservoir types, and the fracturing modification of the reservoirs needs to increase the spread area/volume of hydraulic fractures better, and also is an important consideration factor for reasonably avoiding water and reducing bottom water coning caused by fracturing communication side and bottom water.
In the prior art, a relatively comprehensive and customary analysis flow is provided for reservoir lithology, physical properties, oil-bearing properties, reservoir rock mechanical characteristics, compressibility and the like. For the fractured side and bottom water reservoir, the influence degree of the side and bottom water is mainly considered as the water-avoiding height and the longitudinal downward extending distance of the hydraulic fracture. However, the influence degree of the edge water and the bottom water does not consider the influence of the formation pressure and the effective natural fracture inclination angle, and the influence factors are not comprehensively quantized; comprehensive quantitative evaluation analysis is not carried out on the influence degree of the bottom water and the complex hydraulic fracture conditions formed by the reservoir, and a quick decision-making plate is not formed. And the development effect of the horizontal well with the fracture profile and the bottom water reservoir is different due to the lack of reliable fracturing scheme design basis.
Therefore, the problems of weak pertinence and effectiveness of fracture type edge and bottom water reservoir transformation process technology and parameter selection and poor convenience of scheme design exist in the prior art.
Disclosure of Invention
The invention mainly aims to provide a fractured reservoir transformation process, which aims to solve the problems of weak pertinence and low effectiveness of fractured side and bottom water reservoir transformation process technology and parameter selection and poor convenience of scheme design in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a fracture reservoir modification process, including: setting a fracture parameter evaluation standard of the fractured reservoir; selecting a fractured oil reservoir and determining parameters of the fractured oil reservoir; comparing parameters of the fractured reservoir with fracture parameter evaluation standards of the fractured reservoir, and determining the side bottom water influence level and the complex hydraulic fracture forming condition level; determining a preset subarea of the fractured reservoir according to the side bottom water influence level and the formed complex hydraulic fracture condition level; and determining a reconstruction scheme of the fractured reservoir.
Further, the selected fractured reservoir is a fractured edge water reservoir or a fractured bottom water reservoir.
Further, the evaluation criteria of fracture oil reservoir fracturing parameters comprise effective natural fracture inclination angles, water-avoiding heights, formation pressure coefficients, effective natural fracture densities, two-way pressure differences and approach angles.
Further, when determining the influence level of the edge bottom water and the condition level of forming the complex hydraulic fracture, determining the influence level of the edge bottom water according to the effective natural fracture inclination angle, the water-avoiding height and the formation pressure coefficient; and determining the condition grade of the formed complex hydraulic fracture according to the effective natural fracture density, the two-way pressure difference and the approach angle.
Further, when determining the influence level of the edge bottom water, the weight of the effective natural fracture dip angle is 0.2, the weight of the water-avoiding height is 0.5, and the weight of the formation pressure coefficient is 0.3; and/or the effective natural fracture density is weighted 0.45, the two-way pressure differential is weighted 0.35, and the approach angle is weighted 0.2 when determining the level of conditions for forming complex hydraulic fractures.
And further dividing the preset subarea of the fracture oil reservoir into a first area, a second area and a third area according to the influence grade of the bottom water and the condition grade of the formed complex hydraulic fracture.
Furthermore, the first zone comprises a first zone and a second zone, the fracturing mode adopted by the first zone and the second zone is composite fracturing, and the composite fracturing comprises at least one of energy storage fracturing and temporary blocking fracturing.
Furthermore, the second zone comprises a third zone, a fourth zone, a fifth zone and a sixth zone, the fracturing mode adopted by the third zone is reverse mixed fracturing, the fracturing mode adopted by the fourth zone is composite fracturing and slug sand adding, the fracturing mode adopted by the fifth zone is composite fracturing, and the fracturing mode adopted by the sixth zone is reverse mixed fracturing.
Further, the third zone comprises a seventh zone, an eighth zone and a ninth zone, the fracturing mode adopted by the seventh zone is composite fracturing, the fracturing mode adopted by the eighth zone is composite fracturing, and the fracturing mode adopted by the ninth zone is conventional guanidine gum fracturing.
Further, when a reconstruction scheme of the fractured reservoir is determined, when the fractured reservoir is located in the first area, the selected main reconstruction process is open hole sliding sleeve partial pressure; when the fracture oil reservoir is positioned in the second area, the selected main body transformation process is well cementation bridge plug partial pressure; when the fractured reservoir is located in the third area, the selected main body transformation process is coiled tubing partial pressure.
By applying the technical scheme of the invention, the fracture oil reservoir transformation process comprises the following steps: setting a fracture parameter evaluation standard of the fractured reservoir; selecting a fractured oil reservoir and determining parameters of the fractured oil reservoir; comparing parameters of the fractured reservoir with fracture parameter evaluation standards of the fractured reservoir, and determining the side bottom water influence level and the complex hydraulic fracture forming condition level; determining a preset subarea of the fractured reservoir according to the side bottom water influence level and the formed complex hydraulic fracture condition level; and determining a reconstruction scheme of the fractured reservoir.
The application provides a fracture-type edge and bottom water reservoir transformation process and parameter evaluation optimization method, which can be used for rapidly finishing the evaluation of the edge and bottom water influence degree and the reservoir formation complex hydraulic fracture condition and the optimization of the fracturing process and parameters, providing technical support for the fracture-type edge and bottom water reservoir transformation, and improving the pertinence, effectiveness and scheme design convenience of the fracturing transformation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a preferred plate for fracture-type edge and bottom water reservoir reformation process and parameter evaluation in the present application;
FIG. 2 illustrates a preferred plate for fracture-type edge and bottom water reservoir modification process and parameter evaluation according to an embodiment of the present application;
FIG. 3 illustrates a flow diagram of a fracture reservoir reconstruction process in accordance with an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problems of weak pertinence and low effectiveness of the fracture type edge and bottom water reservoir transformation process technology and parameter selection and poor convenience of scheme design in the prior art, the application provides a fracture reservoir transformation process.
As shown in fig. 3, the fracture reservoir reconstruction process in the present application includes: setting a fracture parameter evaluation standard of the fractured reservoir; selecting a fractured oil reservoir and determining parameters of the fractured oil reservoir; comparing parameters of the fractured reservoir with fracture parameter evaluation standards of the fractured reservoir, and determining the side bottom water influence level and the complex hydraulic fracture forming condition level; determining a preset subarea of the fractured reservoir according to the side bottom water influence level and the formed complex hydraulic fracture condition level; and determining a reconstruction scheme of the fractured reservoir.
The application provides a fracture-type edge and bottom water reservoir transformation process and parameter evaluation optimization method, which can be used for rapidly finishing the evaluation of the edge and bottom water influence degree and the reservoir formation complex hydraulic fracture condition and the optimization of the fracturing process and parameters, providing technical support for the fracture-type edge and bottom water reservoir transformation, and improving the pertinence, effectiveness and scheme design convenience of the fracturing transformation.
Specifically, the selected fractured reservoir is a fractured side-water reservoir or a fractured bottom-water reservoir.
Specifically, as shown in table 1, the fracture reservoir fracturing parameter evaluation criteria include effective natural fracture dip, water-avoiding height, formation pressure coefficient, effective natural fracture density, two-way pressure difference, and approach angle.
As shown in table 1, when determining the edge bottom water influence level and the condition level of forming complex hydraulic fractures, determining the edge bottom water influence level according to the effective natural fracture inclination angle, the water-avoiding height and the formation pressure coefficient; and determining the condition grade of the formed complex hydraulic fracture according to the effective natural fracture density, the two-way pressure difference and the approach angle.
Moreover, as shown in table 1, when determining the influence level of the edge bottom water, the weight of the effective natural fracture dip angle is 0.2, the weight of the water-sheltering height is 0.5, and the weight of the formation pressure coefficient is 0.3; and/or the effective natural fracture density is weighted 0.45, the two-way pressure differential is weighted 0.35, and the approach angle is weighted 0.2 when determining the level of conditions for forming complex hydraulic fractures. In table 1, the qualitative evaluation column corresponds to the bottom water influence level and the complex hydraulic fracture formation condition level.
TABLE 1 evaluation criteria for fracture key parameters of fracture-type edge and bottom water reservoirs
Specifically, as shown in table 2, the predetermined zones of the fractured reservoir are divided into a first zone (i.e., zone i in table 2), a second zone (i.e., zone ii in table 2), and a third zone (i.e., zone iii in table 2) according to the bottom water influence level and the level of the conditions for forming complex hydraulic fractures.
Specifically, the first zone comprises a first partition (i.e., I in Table 2)1Zone) and a second zone (i.e., I in Table 2)2The zones), the fracturing mode adopted by the first zone and the second zone is composite fracturing, and the composite fracturing comprises at least one of energy storage fracturing and temporary plugging fracturing.
Specifically, the second zone comprises a third zone (i.e., II in Table 2)1Zone), fourth zone (i.e., II in Table 2)2Zone), fifth partition (i.e., II in Table 2)3Zone) and sixth zone (i.e., II in Table 2)4Zone), the fracturing mode that the third subregion adopted is the reverse mixed fracturing, and the fracturing mode that the fourth subregion adopted is composite fracturing and slug plus sand, and the fracturing mode that the fifth subregion adopted is composite fracturing, and the fracturing mode that the sixth subregion adopted is the reverse mixed fracturing.
Specifically, the third zone comprises a seventh zone (i.e., III in Table 2)1Zone), eighth zone (i.e., III in Table 2)2Zone) and ninth zone (i.e., III in Table 2)3Zone), the fracturing mode that the seventh zone adopted is composite fracturing, the fracturing mode that the eighth zone adopted is composite fracturing, and the fracturing mode that the ninth zone adopted is conventional guanidine gum fracturing.
TABLE 2 optimal selection recommendation table for fracture type edge and bottom water reservoir reconstruction technique and parameters
Specifically, when a reconstruction scheme of the fractured reservoir is determined, when the fractured reservoir is located in a first area, the selected main reconstruction process is open-hole sliding sleeve partial pressure; when the fracture oil reservoir is positioned in the second area, the selected main body transformation process is well cementation bridge plug partial pressure; when the fractured reservoir is located in the third area, the selected main body transformation process is coiled tubing partial pressure.
In one embodiment of the present application, a defined reservoir is modified by the steps of:
1) the key parameter values required in Table 1 were collected and quantitatively evaluated
The effective natural fracture dip angle is: 40-70 degrees and 53 degrees;
the water-avoiding height is as follows: 40 m;
the formation pressure coefficient is: 1.27-1.3, taking the value of 1.29;
the effective natural fracture density is: 12-20 strips/m, and taking the value of 17 strips/m;
the two stress differences are: 4-6MPa, and the value is 5 MPa;
approach angle (angle between maximum horizontal principal stress and effective natural fracture strike): 10-70 degrees and 55 degrees;
calculating and evaluating the influence degree of the edge bottom water: 0.2 × 30+0.5 × 50+0.3 × 70 out of 52 points, medium;
and (3) calculating and evaluating the advantages and disadvantages of the conditions for forming the complex hydraulic fracture: 0.45X 60+ 0.35X 80+ 0.2X 80 is preferably 71 points.
2) Determining the preset partition by using the graph 1
According to the evaluation score: the influence degree of the edge bottom water (52 points) and the condition of the complex hydraulic fracture (71 points), and the preset partition is determined to be a II 4 area by utilizing the fracture type bottom water oil reservoir modification process and the parameter evaluation preferred plate shown in the figure 1. The results are shown in FIG. 2.
3) Determining fracturing modification subject scenarios with reference to table 2
And determining the main transformation scheme of the shallow layer carboniferous oil deposit in the first region of the Clarity oil field by using the determined preset partition result and referring to the table 2 as follows: well cementation bridge plug well completion, single section 2-3 clusters, a reverse mixed fracturing technology, a seam spacing of 30-45m, large displacement operation (8-10m3/min), single seam liquid volume scale (large liquid volume, about 600m3/min), slickwater proportion of about 45% and single seam sand adding scale (large liquid volume, 40-50m 3).
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the method can realize quick evaluation of the influence degree of the fracture type edge and the bottom water reservoir and the complex hydraulic fracture condition formed by the reservoir and optimization of the oil reservoir transformation process technology and parameters, and can effectively improve the pertinence, effectiveness and scheme design convenience of the fracture type edge and the bottom water reservoir transformation.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fracture reservoir reconstruction process, comprising:
setting a fracture parameter evaluation standard of the fractured reservoir;
selecting a fractured oil reservoir and determining parameters of the fractured oil reservoir;
comparing the parameters of the fractured reservoir with the fracture parameter evaluation standards of the fractured reservoir, and determining the side bottom water influence level and the complex hydraulic fracture condition level;
determining a preset subarea of the fractured reservoir according to the side bottom water influence grade and the condition grade of the formed complex hydraulic fracture;
determining a modification scheme for the fractured reservoir.
2. The fractured reservoir reformation process of claim 1, wherein the fractured reservoir selected is a fractured side-water reservoir or a fractured bottom-water reservoir.
3. The fractured reservoir reconstruction process of claim 1, wherein the fractured reservoir fracturing parameter evaluation criteria comprise effective natural fracture dip angle, water-sheltering height, formation pressure coefficient, effective natural fracture density, two-way pressure difference and approach angle.
4. The fractured reservoir reconstruction process of claim 3 wherein, in determining the edge water impact rating and the complex hydraulic fracture formation condition rating,
determining the influence level of the edge bottom water according to the effective natural fracture inclination angle, the water-avoiding height and the formation pressure coefficient;
and determining the condition grade of the formed complex hydraulic fracture according to the effective natural fracture density, the two-way pressure difference and the approach angle.
5. The fractured reservoir reconstruction process of claim 4,
when the influence level of the edge bottom water is determined, the weight of the effective natural fracture dip angle is 0.2, the weight of the water-avoiding height is 0.5, and the weight of the formation pressure coefficient is 0.3; and/or
In determining the complex hydraulic fracture formation condition rating, the effective natural fracture density is weighted 0.45, the two-way pressure differential is weighted 0.35, and the approach angle is weighted 0.2.
6. The fractured reservoir reformation process of any one of claims 1 to 5, wherein the predetermined zones of the fractured reservoir are divided into a first zone, a second zone, and a third zone according to the edge-bottom water impact rating and the complex hydraulic fracture formation condition rating.
7. A fracture reservoir modification process according to claim 6, wherein the first zone comprises a first zone and a second zone, and the fracturing mode adopted by the first zone and the second zone is composite fracturing, and the composite fracturing comprises at least one of energy storage fracturing and temporary plugging fracturing.
8. A fracture reservoir modification process as claimed in claim 6, wherein the second zone comprises a third zone, a fourth zone, a fifth zone and a sixth zone, the fracturing mode adopted by the third zone is reverse mixed fracturing, the fracturing mode adopted by the fourth zone is composite fracturing and slug sanding, the fracturing mode adopted by the fifth zone is composite fracturing, and the fracturing mode adopted by the sixth zone is reverse mixed fracturing.
9. A fracture reservoir modification process as claimed in claim 6, wherein the third zone comprises a seventh zone, an eighth zone and a ninth zone, the seventh zone adopts a fracturing mode of composite fracturing, the eighth zone adopts a fracturing mode of composite fracturing, and the ninth zone adopts a fracturing mode of conventional guanidine gum fracturing.
10. The fractured reservoir reconstruction process of claim 6, wherein in determining a reconstruction plan for the fractured reservoir,
when the fracture oil reservoir is located in the first area, the selected main body transformation process is open hole sliding sleeve partial pressure;
when the fracture oil reservoir is positioned in the second area, the selected main body transformation process is well cementation bridge plug partial pressure;
and when the fractured reservoir is located in the third zone, the selected main body transformation process is coiled tubing partial pressure.
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|---|---|---|---|---|
| RU2209952C1 (en) * | 2002-10-03 | 2003-08-10 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method of oil pool development |
| CN105003240A (en) * | 2015-07-15 | 2015-10-28 | 西南石油大学 | Hydrofracture design parameter optimization method based on fine classification of reservoir |
| CN106703776A (en) * | 2016-12-23 | 2017-05-24 | 西南石油大学 | Method for optimizing fracturing parameters |
| CN109034647A (en) * | 2018-08-13 | 2018-12-18 | 西南石油大学 | A kind of method that densification oil-gas reservoir volume fracturing horizontal well refracturing selects well |
| CN110469303A (en) * | 2019-07-04 | 2019-11-19 | 西南石油大学 | A kind of volume fracturing method for optimally designing parameters based on four classes transformation volume |
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- 2020-06-08 CN CN202010514886.7A patent/CN113833445B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2209952C1 (en) * | 2002-10-03 | 2003-08-10 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method of oil pool development |
| CN105003240A (en) * | 2015-07-15 | 2015-10-28 | 西南石油大学 | Hydrofracture design parameter optimization method based on fine classification of reservoir |
| CN106703776A (en) * | 2016-12-23 | 2017-05-24 | 西南石油大学 | Method for optimizing fracturing parameters |
| CN109034647A (en) * | 2018-08-13 | 2018-12-18 | 西南石油大学 | A kind of method that densification oil-gas reservoir volume fracturing horizontal well refracturing selects well |
| CN110469303A (en) * | 2019-07-04 | 2019-11-19 | 西南石油大学 | A kind of volume fracturing method for optimally designing parameters based on four classes transformation volume |
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