An Evaluation Method for Sweep Coefficient of Water Drive in Low Permeability Reservoirs

An evaluation method and low-permeability technology, applied in digital data processing, special data processing applications, instruments, etc., can solve the problems of lack of low-permeability reservoir water flooding sweep coefficient evaluation and other issues

Active Publication Date: 2017-10-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] The embodiment of the present invention provides a method for evaluating the water flooding sweep coefficient of low permeability reservoirs, so as to solve the technical problem in the prior art that there is no method for evaluating the water flooding sweep coefficient of low permeability reservoirs

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  • An Evaluation Method for Sweep Coefficient of Water Drive in Low Permeability Reservoirs
  • An Evaluation Method for Sweep Coefficient of Water Drive in Low Permeability Reservoirs
  • An Evaluation Method for Sweep Coefficient of Water Drive in Low Permeability Reservoirs

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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0019] In order to accurately and effectively analyze the current value and allowable increase of the longitudinal sweep coefficient, in this embodiment, an evaluation method for the longitudinal water drive sweep coefficient is provided to provide a basis for analyzing the current value and allowable increase of the longitudinal water drive sweep coefficient . Specifically, such as figure 1 As shown, the evaluation method of longitudinal water flooding sweep coefficient can be realized through the following steps:

[0020] Step 101: Determine the main controlling factors of the vertical wate...

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Abstract

An embodiment of the present invention provides a method for evaluating the water flooding sweep coefficient of a low-permeability reservoir, including the evaluation methods for the longitudinal sweep coefficient and the planar sweep coefficient. The evaluation method of vertical sweep coefficient includes: determining the main controlling factors of vertical sweep coefficient of low-permeability reservoirs; introducing the sand body connectivity coefficient to modify the vertical sweep prediction formula; conducting sensitivity analysis and drawing a chart for easy reference. The evaluation method of plane sweep coefficient includes: transforming the permeability of low-permeability reservoirs under anisotropy into the permeability of isotropy through coordinate transformation; considering the anisotropy and starting pressure gradient, determining the area of ​​water flooding sweep; Determine the area of ​​the well control area; determine the ratio of the area of ​​the water flooding area to the area of ​​the well control area as the plane sweep coefficient of the low permeability reservoir. The embodiment of the present invention realizes the evaluation of the water flooding sweep coefficient of the low permeability reservoir, and provides a basis and an adjustment direction for improving the recovery rate of the low permeability water flooding.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to an evaluation method for water flooding sweep coefficient of low permeability reservoirs. Background technique [0002] At present, the problems in the development of low-permeability oilfields are mainly manifested in: first, under the conditions of current technical means and water injection development, it is difficult to improve oil displacement efficiency and reservoir recovery; second, due to the development of natural fractures in the reservoir, there are Anisotropy and start-up pressure gradient, water flooding sweep efficiency is not high, plane and profile contradictions are prominent, the development process is characterized by high production, high speed, fast decline, and difficulty in stabilizing production; thirdly, there is a lack of supporting technologies to further improve water flooding effect, and oilfield production is stable The foundation is r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 曹仁义程林松周焱斌熊琪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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