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Calculation method of comprehensive well index suitable for numerical simulation of reservoir

A technology of numerical simulation and calculation method, applied in the direction of earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2021-08-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

At present, there is no effective calculation method for calculating the well index of reservoir numerical simulation based on unstructured grid, which can more accurately describe the state of injection or production wells in reservoir numerical simulation

Method used

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  • Calculation method of comprehensive well index suitable for numerical simulation of reservoir
  • Calculation method of comprehensive well index suitable for numerical simulation of reservoir
  • Calculation method of comprehensive well index suitable for numerical simulation of reservoir

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Embodiment Construction

[0020] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0021] Such as figure 1 as shown, figure 1 It is a flow chart of the comprehensive well index calculation method suitable for reservoir numerical simulation of the present invention.

[0022] Such as figure 2 Shown is a plan view of an unstructured grid cell with 6 seepage faces and a well in the center of the grid cell. In step 101, the side length L of each seepage surface of the node unit where the well is located is calculated 1 , L 2 , L 3 , L 4 , L 5 , L 6 ;

[0023] Calculate the seepage length, which is the distance d from the midpoint of each edge to the grid center where the well is located 1 、d 2 、d 3 、d 4 、d 5 、d 6 ;

[0024] To calculate the equivalent oil drainage radius of the grid unit, the calculation formula is

[...

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Abstract

The present invention provides a comprehensive well index calculation method suitable for reservoir numerical simulation. The comprehensive well index calculation method suitable for reservoir numerical simulation includes: Step 1, calculating the length of each seepage surface, seepage length, Through the direction permeability of the seepage surface; step 2, calculate the comprehensive permeability of the node unit where the well is located; step 3, calculate the comprehensive well index. The calculation method of the comprehensive well index in the numerical simulation of oil and gas reservoirs can quantitatively calculate the well index of the well model in the numerical simulation of oil and gas reservoirs based on the unstructured grid system, which lays the foundation for improving the numerical simulation technology of oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of reservoir development, in particular to a comprehensive well index calculation method suitable for reservoir numerical simulation. Background technique [0002] Well model is a very important model for well description in numerical simulation of oil and gas reservoirs, and the coupling between wells and reservoirs is characterized by well models. The well index is an important parameter of the well model, and the calculation method of the well model is directly related to the accuracy of the numerical simulation results of the reservoir. With the development of tight low-permeability reservoirs with natural fractures and reservoir fracturing, the reservoir numerical simulation technology has been developed rapidly. Conventional reservoir numerical simulation methods established on the basis of rectangular grid systems have been difficult to meet the needs of complex multi-media reservoir description. Re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 苏海波孙业恒杨勇曹绪龙于金彪董亚娟孟薇易红霞侯玉培陈燕虎孙红霞
Owner CHINA PETROLEUM & CHEM CORP