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Profile control and water plugging well selection decision-making method for low-permeability reservoirs

A technology for profile control and water shutoff and decision-making method, which is applied to earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve problems such as poor applicability, unstable calculation of decision-making factors, and inability to reflect reservoir heterogeneity.

Inactive Publication Date: 2013-08-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to provide a decision-making method for profile control, water plugging and well selection in low-permeability reservoirs, so as to solve the problem that when the existing PI decision-making method is applied to low-permeability oilfields, the calculation of decision factors is unstable and cannot reflect reservoir heterogeneity. Poor applicability caused by qualitative properties and low predictive ability of plugging regulation effect

Method used

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  • Profile control and water plugging well selection decision-making method for low-permeability reservoirs
  • Profile control and water plugging well selection decision-making method for low-permeability reservoirs
  • Profile control and water plugging well selection decision-making method for low-permeability reservoirs

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Embodiment 1

[0016] This embodiment provides a decision-making method for profile control and water plugging in low-permeability reservoirs, such as figure 1 As shown, the method includes:

[0017] Step S11, respectively calculate the fourth decision factor CI that characterizes the injectability of plugging agent, the first decision factor Pa1 that characterizes intralayer heterogeneity, the second decision factor Pa2 that characterizes interlayer heterogeneity, and the plane heterogeneity Qualitative third decision factor Pa3;

[0018] Step S12, according to the fourth decision factor CI, the first decision factor Pa1, the second decision factor Pa2 and the third decision factor Pa3, establish a congestion control decision factor RMF;

[0019] Step S13, applying the plugging regulation decision factor RMF to make a well selection decision for plugging regulation;

[0020] Step S14, using the plugging regulation decision factor RMF to calculate the cumulative oil increase Q of the plugg...

Embodiment 2

[0069] In order to have a more intuitive understanding of the application effect of the decision-making method for profile control, water plugging, and well selection in low-permeability reservoirs provided in Example 1, the specific implementation of the present invention will now be described by taking the decision-making process of profile control and well selection in a low-permeability oilfield using the above-mentioned method as an example. implementation.

[0070] Table 1 shows the decision-making method of profile control, water plugging and well selection for low-permeability reservoirs provided in Example 1. The twelve water injection well groups in this low-permeability oilfield are calculated, and the RMF results of decision-making factors for plugging regulation are obtained:

[0071] Table 1

[0072] Well group number

CI

Pa1

Pa2

Pa3

RMF

Well Group 1

4.03

1.75

0.4

0.02

0.5

Well Group 2

13.06

1....

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Abstract

The invention provides a profile control and water plugging well selection decision-making method for low-permeability reservoirs. The method comprises calculating a fourth decision-making factor CI reflecting the injectivity of a plugging agent, a first anisotropic decision-making factor Pa1 in representation layers, a second anisotropic decision-making factor Pa2 among the representation layers, and a third anisotropic decision-making factor Pa3 on the representation plane respectively; establishing a profile control and water plugging decision-making factor RMF; and using the profile control and water plugging decision-making factor RMF for profile control and water plugging well selection decision-making; and calculating an accumulated oil increment QT of the profile control and water plugging measure, which represents the profile control and water plugging measure effect, by using the profile control and water plugging decision-making factor RMF. By means of the method, the problems of instable calculation results and poor effect predictive when a pressure index (PI) decision is applied to low-permeability reservoirs, and the scientific profile control and water plugging decision for low-permeability reservoirs is implemented.

Description

technical field [0001] The invention relates to the field of well selection decision-making for profile control, water plugging, and well selection in reservoir development and adjustment, in particular to a decision-making method for profile control, water plugging, and well selection in low-permeability oil reservoirs. Background technique [0002] For waterflood development oilfields, the distribution of underground oil and water will gradually become more complex, and the differences in water cut levels and producing degrees within layers, between layers, and on the plane will become larger and larger, and the heterogeneity will become more serious, resulting in the breakthrough and channeling of injected water. Reduce oil displacement efficiency, cause premature water flooding of oil wells, and affect oil field development effect. Therefore, it is particularly important for the efficient and economical development of reservoirs to clarify the direction of water-producin...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B33/13
Inventor 刘同敬侯吉瑞刘柏林王佳刘金菊第五鹏翔李俊键姜宝益周建
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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