CN-122021375-A - Method for researching productivity influence factors of edge water injection of strip-shaped side water reservoir

Abstract

The invention belongs to the technical field of exploration and development of tight sandstone oil and gas reservoirs, and particularly relates to a method for researching productivity influence factors of strip-shaped side water reservoir edge water injection, which is suitable for low-permeability reservoirs with side water development. According to the method, the dip angle, the side water energy, the oil well discharge number and the permeability of the reservoir physical property reservoir are taken as productivity influence factors, a Grid network model is applied, and the productivity influence factor analysis is carried out by controlling single factor variables according to the physical property range of the actual reservoir, so that the influence rule of the physical property of each reservoir on the productivity is obtained. The method is based on a back inclined structure, combines with matched production measures to furthest utilize natural energy to improve recovery ratio, keeps reservoir pressure, simultaneously inhibits side water from bursting in, avoids rapid rising of water content in an oil well, and has certain guiding significance on development of the side water oil reservoir compared with the prior side water oil reservoir development technical policy.

Inventors

• SONG PENG
• ZHANG HANDAN
• WANG CHONG
• CHENG GUOFENG
• LIAO YONGLE
• XU JINGGANG
• XIE QICHAO
• DUAN WENHAO
• WANG NAN
• LIU JIAN
• JI SONGFENG
• YANG WEIGUO
• LI SHUHENG
• CAO LIKUN

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (9)

1. 1. A method for researching productivity influence factors of edge water injection of a strip-shaped side water reservoir is characterized by comprising the following steps: Step 1), establishing a boundary water oil reservoir mechanism model according to reservoir characteristics and fluid physical properties of a strip boundary water oil reservoir, measuring high-pressure physical properties of reservoir crude oil and rock through experiments, and establishing a Grid network model by combining an actual reservoir structure; Step 2) taking the dip angle, the side water energy, the oil well arrangement number and the extremely poor permeability of the reservoir physical property reservoir as productivity influencing factors, applying a Grid network model, and carrying out productivity influencing factor analysis by controlling single factor variables according to the physical property range of the actual reservoir to obtain the influence rule of the physical property of each reservoir on the productivity; And 3) providing corresponding production measures according to the influence trend of the physical property change of each reservoir on productivity, and improving the development effect.
2. 2. The method for studying the productivity influence factor of strip-shaped side water reservoir edge water injection as set forth in claim 1, wherein the reservoir characteristics and fluid properties in step 1) include porosity, permeability, saturation and formation water density.
3. 3. The method for researching the productivity influence factor of strip-shaped side water reservoir edge water injection according to claim 1, wherein the high-pressure physical properties in the step 1) comprise compression coefficients of crude oil, formation water and rock.
4. 4. The method for researching productivity influence factors of strip-shaped side water reservoir edge water injection according to claim 1, wherein the Grid network model parameters in the step 1) are 101 multiplied by 25, the x-y-z permeability is 20-20-12mD, the average porosity is 0.15, the original stratum pressure is 14MPa, the well spacing/row spacing is 300m/300m, the z-direction dimension is 1 Grid 1m, the oil layer thickness is 10m, and the oil saturation is 0.628.
5. 5. The method for researching the productivity influence factor of the strip-shaped side water reservoir edge water injection according to claim 1, wherein when the water body multiple of the reaction side water energy is smaller than 60, the formation energy is kept to improve the development effect through synchronous side water injection, and when the water body multiple is larger than 80, early water breakthrough is avoided through lagging water injection so as to improve the development effect.
6. 6. The method for researching the productivity influence factors of the marginal water injection of the strip-shaped side water reservoir according to claim 1, wherein when the dip angle of the reservoir is smaller than 20m/km, the development effect is improved by reducing the water injection quantity, and when the dip angle of the reservoir is larger than 20m/km, the development effect is improved by selecting the higher water-containing oil well for transfer injection, and the formation energy is supplemented.
7. 7. The method for researching the productivity influence factors of the edge water injection of the strip-shaped side water reservoir, which is disclosed in claim 1, is characterized in that when the reservoir permeability is 20mD, the development effect can be improved by reasonable oil well arrangement number of 4 rows, when the reservoir permeability is 50mD, the development effect can be improved by 3-4 rows, and when the reservoir permeability is 80mD, the development effect can be improved by 2 rows.
8. 8. The method for researching the productivity influence factors of the edge water flooding of the strip-shaped side water reservoir according to claim 1 is characterized in that when the reservoir is positive rhythm deposition, the development of the side water flooding is selected to improve the development effect, and when the reservoir is negative rhythm deposition, the development of the reservoir flooding is selected to improve the development effect.
9. 9. The method for researching production capacity influence factors of strip-shaped side water reservoir edge water injection according to claim 1, wherein when the permeability is extremely poor to be more than 20, the positive prosody deposition reservoir delays oil well water injection and improves development effect by reducing water injection quantity, and the negative prosody deposition reservoir improves development effect by moving the water injection well position to a position with higher construction.

Description

Method for researching productivity influence factors of edge water injection of strip-shaped side water reservoir Technical Field The invention belongs to the technical field of exploration and development of tight sandstone oil and gas reservoirs, and particularly relates to a method for researching productivity influence factors of strip-shaped side water reservoir edge water injection, which is suitable for low-permeability reservoirs with side water development. Background The long-term celebration oil field is mainly developed by water injection. In the development process of the side water oil reservoir, the side water is extremely easy to rush in due to an unreasonable development system, the water content of an oil well is rapidly increased, and the utilization difficulty of natural side water energy is high due to strong heterogeneity and reservoir structure. At present, in the development process of a side water oil reservoir, an unreasonable development system is extremely easy to cause side water to rush in, so that the water content of an oil well is quickly increased, and the utilization difficulty of natural side water energy is high due to strong heterogeneity and reservoir structure. The reasonable production system is mostly determined by adopting an oil reservoir numerical simulation method and a physical simulation method. The physical simulation method is complex in operation, the experimental result is often inaccurate due to human factors, the numerical simulation method is generally simple in operation, but the consideration of a plurality of actual factors influencing the productivity is lacking, the research on the reservoir dip angle is less at present, the number of dwarf side water reservoirs is more, the reservoir dip angle change is larger, and therefore the reservoir dip angle is needed to be used as the oil well productivity influencing factor of the dwarf side water reservoirs, and the influence of the reservoir dip angle in the reservoir development process is analyzed. The method comprises the steps of determining an oil-water boundary based on an oil reservoir water distribution map, dividing an edge water bursting area, carrying out blocking removal operation on oil extraction wells in the edge water bursting area, reducing the liquid extraction intensity of the oil extraction wells in the edge water bursting area after blocking removal is finished, simultaneously increasing the water injection intensity of water injection wells in the edge water bursting area, encrypting a flooding well pattern at the oil-water boundary in the edge water bursting area, selecting part of the water injection wells in the edge water bursting area according to the crack development condition, carrying out area profile control, selecting part of the water injection wells in the edge water bursting area according to the crack development condition, and carrying out sub-division water injection. The invention is used for solving the problem that the prior art lacks an effective side water control means for the side water oil reservoir of crack development, and realizing the purposes of scientifically, reasonably and systematically regulating and controlling after the side water oil reservoir of crack development rapidly meets water, ensuring stable productivity and improving the final recovery ratio as much as possible. The method does not study the influence of reservoir physical property change on productivity, and cannot effectively improve the development effect. Disclosure of Invention The invention aims to provide a method for researching productivity influence factors of strip-shaped side water reservoir edge water injection, so that natural energy is reasonably utilized, reservoir pressure is kept, side water is restrained from jumping in, rapid rising of water in an oil well is avoided, and further development of technical policies of oil field development is guided. Therefore, the technical scheme provided by the invention is as follows: A method for researching productivity influence factors of edge water injection of a strip-shaped side water reservoir comprises the following steps: Step 1), establishing a boundary water oil reservoir mechanism model according to reservoir characteristics and fluid physical properties of a strip boundary water oil reservoir, measuring high-pressure physical properties of reservoir crude oil and rock through experiments, and establishing a Grid network model by combining an actual reservoir structure; Step 2) taking the dip angle, the side water energy, the oil well arrangement number and the extremely poor permeability of the reservoir physical property reservoir as productivity influencing factors, applying a Grid network model, and carrying out productivity influencing factor analysis by controlling single factor variables according to the physical property range of the actual reservoir to obtain the influence rule of the physical property of e