Method for confirming oil drainage front edge with consideration of starting pressure gradient

A technology of starting pressure gradient and front edge, which is used in earth-moving drilling, surveying, wellbore/well components, etc., can solve the problem of low permeability, difficult to obtain data of radial flow characteristics, and difficult to accurately obtain effective formation permeability and other problems, to achieve the effect of huge economic benefits

Active Publication Date: 2013-10-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Due to the low permeability of low-permeability reservoirs, it is difficult to obtain data with radial flow characteristics in well testing tests, which makes it difficult to accurately obtain the effective permeability value of the formation with the current well test interpretation technology based on the theory of radial flow characteristics

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  • Method for confirming oil drainage front edge with consideration of starting pressure gradient
  • Method for confirming oil drainage front edge with consideration of starting pressure gradient
  • Method for confirming oil drainage front edge with consideration of starting pressure gradient

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Embodiment Construction

[0016] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0017] Such as figure 1 as shown, figure 1 It is a flow chart of the method for determining the oil drainage front considering the start-up pressure gradient of the present invention.

[0018] In step 101, multiple formation physical and fluid parameters are obtained according to the logging interpretation results, well completion geological reports, and high-pressure physical property analysis reports. In one embodiment, the multiple formation physical and fluid parameters include porosity Φ, formation effective thickness h, water saturation S w , oil saturation S o , well radius r w , oil volume coefficient B o , formation oil compressibility C o , formation water compressibility C w . Among them, the parameter porosity Φ is a decimal, ...

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Abstract

The invention provides a method for confirming an oil drainage front edge with the consideration of a starting pressure gradient. The method for confirming the oil drainage front edge includes the steps of S1, obtaining the physical properties and fluid parameters of multiple strata according to well logging interpretation results, well completion geological reports and high-pressure physical property analysis reports, S2, confirming comprehensive compression coefficients, S3, obtaining accumulated production and pressure recovery pressure differences according to low permeability reservoir oil well production reports and pressure recovery well testing data, S4, drawing a relationship line between yields and pit bottom pressure differences according to oil well potential test data, confirming the intercept of the line, and S5, confirming the oil drainage front edge of a low permeability reservoir oil well according to the parameters obtained from S1-S4. According to the method for confirming the oil drainage front edge with the consideration of the starting pressure gradient, the characteristics of a low permeability reservoir and the actual dynamic data of a producing well are fully considered, and the accuracy in confirming the oil drainage front edge of the low permeability reservoir oil well is improved.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining the oil drainage front in consideration of the start-up pressure gradient. Background technique [0002] The drainage front of oil wells in low-permeability reservoirs is the main parameter for the development of low-permeability reservoirs, which directly affects the accuracy of well pattern and spacing determination in the process of oil recovery and water injection, and further affects the development effect of oilfields. At present, the calculation method of oil well drainage front in low permeability reservoir needs to determine the formation effective permeability, which can only be obtained by well test and well test analysis. Due to the low permeability of low-permeability reservoirs, it is difficult to obtain data with radial flow characteristics in well testing tests, which makes it difficult to accurately obtain the formation effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10
Inventor 韩凤蕊李友全于伟杰阎燕王杰李弘博赵辉岳小华张金柱
Owner CHINA PETROLEUM & CHEM CORP
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