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Horizontal well staged fracturing numerical simulation method based on unstructured grid

An unstructured grid and segmented fracturing technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of poor unstructured grid effect and achieve the effect of strong application value

Active Publication Date: 2016-07-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0006] In order to solve the problem that the unstructured grids in the prior art are not effective in describing wellsides or fractures, the present invention provides a numerical simulation method for segmental fracturing of horizontal wells based on unstructured grids

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  • Horizontal well staged fracturing numerical simulation method based on unstructured grid
  • Horizontal well staged fracturing numerical simulation method based on unstructured grid
  • Horizontal well staged fracturing numerical simulation method based on unstructured grid

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Embodiment Construction

[0061] The simulation of unconventional wells, including deviated wells, horizontal wells, lateral wells, and shark-fin-shaped wells, is being gradually improved by commercial reservoir simulators. The processing method basically adopts the establishment of reservoir and wellbore models, and then uses two sets of independent methods of seepage mechanics and fluid mechanics to establish mathematical models, and the two systems are coupled through the production index of the well. This method focuses on solving problems from mathematical modeling, and a large number of numerical experiments show that starting from the initial grid division can often achieve better simulation results, and can effectively reduce the number of grids, improve convergence speed, and increase simulation accuracy. Reliability.

[0062] The present invention is characterized in that:

[0063] 1) Mesh subdivision technology

[0064] As an important technology to promote the development of reservoir num...

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Abstract

The invention relates to a horizontal well staged fracturing numerical simulation method based on the unstructured grid. Appropriate grid subdivision processing is carried out to nearby areas of a horizontal well and a hydraulic fracturing seam, reasonable production power assignment is carried out to a heel end of the horizontal well, a finger end of the horizontal well, the section connected with the fracturing seam, and fine and accurate simulation to a horizontal well staged fracturing model is achieved. The horizontal well staged fracturing numerical simulation method comprises specific steps of a step 1 of establishing a horizontal well staged fracturing mathematical model; a step 2 of establishing a geologic model, dispersing a reservoir simulation area through an unstructured grid technology, establishing the geologic model according to geology, earthquake, well logging, test and production dynamic states, and coarsening the geologic model; a step 3 of carrying out subdivision processing to the grid data of the coarsened geologic model, carrying out multistage encryption processing to a local area, and obtaining a unstructured grid subdivision graph; and a step 4 of applying the mathematical model established in the step 1 to the reservoir geologic model processed in the step 3, and obtaining simulation reservoir data.

Description

technical field [0001] The invention relates to oil reservoir numerical simulation technology in the field of oil and gas field development, in particular to a numerical simulation method for staged fracturing of horizontal wells based on unstructured grids. Background technique [0002] Horizontal well technology is an important technology applied in the production process of oilfields; at present, major oilfields generally use horizontal well technology to adjust and tap the potential of old oilfields, to build capacity in new oilfields, and to achieve efficient development with fewer wells; in the actual production process Among them, the numerical simulation of horizontal well staged fracturing is still a technical problem and needs further development. [0003] Early numerical simulation software could not really consider horizontal wells. In the 1970s, all wells were processed with vertical wells, that is, multiple vertical wells were used instead of one horizontal wel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 康志江张冬丽崔书岳张允李三百
Owner CHINA PETROLEUM & CHEM CORP
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