Low-permeability oil reservoir water flooding wave and coefficient evaluation method

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: 2015-01-28
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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  • Low-permeability oil reservoir water flooding wave and coefficient evaluation method
  • Low-permeability oil reservoir water flooding wave and coefficient evaluation method
  • Low-permeability oil reservoir water flooding wave and coefficient evaluation method

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Embodiment Construction

[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

The embodiment of the invention provides a low-permeability oil reservoir water flooding wave and coefficient evaluation method, which comprises a longitudinal wave and coefficient evaluation method and a plane wave and coefficient evaluation method, wherein the longitudinal wave and coefficient evaluation method comprises the following steps that: longitudinal wave and coefficient main control factors of a low-permeability oil reservoir are determined; a sand body communication coefficient is introduced for modifying longitudinal waves and a prediction formula; sensitivity analysis is carried out; and a plate is drawn, so that the looking-up is convenient. The plane wave and coefficient evaluation method comprises the following steps that: through coordinate conversion, the permeability of the low-permeability oil reservoir during anisotropy is converted into the permeability during isotropy; the water flooding wave and region area is determined by considering the anisotropy and the starting pressure gradient; the well control region area is determined, a ratio of the water flooding wave and region area to the well control region area is determined to be the plane wave and coefficient of the low-permeability oil reservoir. The embodiment of the invention realizes the water flooding wave and coefficient evaluation of the low-permeability oil reservoir, and the basis and the regulating direction are provided for low-permeability water flooding yield improvement.

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 Applications(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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