Well test determination method for vertical fracturing fracture azimuth of low-permeability oil reservoir

A definite method and low-permeability technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as inapplicable low-permeability reservoirs and failure to consider the fluid seepage characteristics of low-permeability reservoirs

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

At present, there are some methods for determining the orientation of vertical fracturing fractures by well testing, but they are not suitable for determining the orientation of vertical fracturing fractures in low-permeability reservoirs because they do not consider the fluid seepage characteristics of low-permeability reservoirs

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  • Well test determination method for vertical fracturing fracture azimuth of low-permeability oil reservoir
  • Well test determination method for vertical fracturing fracture azimuth of low-permeability oil reservoir
  • Well test determination method for vertical fracturing fracture azimuth of low-permeability oil reservoir

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[0025] 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.

[0026] like figure 1 as shown, figure 1 It is a flow chart of the method for determining the orientation of vertically fractured fractures in low-permeability reservoirs of the present invention.

[0027] In step 101, multiple formation physical properties and fluid parameters of the active well and the observation well are determined according to the well location structure map, logging interpretation results, well completion geological report, and high-pressure physical property analysis report. In one embodiment, the multiple formation physical properties and fluid parameters Fluid parameters include well spacing r between the active well and the three observation wells 1 r 2 r 3 , Azimuth angle θ of the three observation wells 1 θ 2 θ ...

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Abstract

The invention provides a well test determination method for the vertical fracturing fracture azimuth of a low-permeability oil reservoir. The well test determination method comprises the steps that a plurality of stratum physical properties and fluid parameters are determined according to a well position structural diagram, a well completion geological report and a high pressure physical property analysis report; a stratum comprehensive compression coefficient is determined; active wells and observation wells are selected for an interference well test, and test time-bottom hole pressure data and test time-active well yield data of all the wells during the interference well test are recorded; an objective function is established according to bottom hole pressure data, of the active wells and the observation wells, obtained through the interference well test; stratum permeability and observation well location parameters are determined according to the objective function; the active well bottom hole vertical fracturing fracture azimuth is determined according to a conversion relationship equation of the azimuth and a rectangular coordinate system; and the fracture direction and permeability are determined. According to the well test determination method for the vertical fracturing fracture azimuth of the low-permeability oil reservoir, the accuracy of determination of the vertical fracturing fracture azimuth of the low-permeability oil reservoir is improved, and accurate parameters are provided for exploitation of the low-permeability oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining the azimuth of a vertical fracturing fracture in a low-permeability oil reservoir by well testing. Background technique [0002] Due to low permeability, low permeability reservoirs are usually exploited by fracturing. The orientation of fractures formed after fracturing determines the distribution of well pattern and spacing in low permeability reservoirs. Accurate determination of fracture orientation can improve the effective development of low permeability reservoirs. . At present, there are some methods for determining the orientation of vertically fractured fractures by well testing, but they are not suitable for determining the orientation of vertically fractured fractures in low-permeability reservoirs because they do not consider the seepage characteristics of fluid in low-permeability reservoirs. For this reason, we invented a new ...

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Application Information

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IPC IPC(8): E21B43/26E21B49/00E21B47/00
Inventor 杨勇孙业恒李友全张奎祥韩凤蕊张德志于伟杰李宏博岳小华陈清举黄成江
Owner CHINA PETROLEUM & CHEM CORP
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