Method for optimizing well shut-in time after shale oil reservoir fracturing

An optimization method and shale reservoir technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as cost increase, extended operation time, and long shut-in time, so as to save construction costs, The effect of improving accuracy and simplifying operation steps

Pending Publication Date: 2021-12-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Analysis after flowback after on-site fracturing found that the longer the well shut-in time, the lower the flowback rate, but the initial daily production increased significantly. The best shut-in time after shale oil fracturing is mainly determined by the experience of engineers. Qualitative and quantitative understanding, if the well shut-in time is too short, the imbibition effect between fracturing fluid and shale is insufficient, and the well shut-in time is too long, prolonging the operation time, resulting in higher costs

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  • Method for optimizing well shut-in time after shale oil reservoir fracturing
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  • Method for optimizing well shut-in time after shale oil reservoir fracturing

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[0116] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0117] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0118] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The embodiment of the invention relates to a method for optimizing well shut-in time after shale oil reservoir fracturing. The optimization method comprises the steps: S100, acquiring reservoir physical property parameters, using fractures in an oil reservoir as the inner boundary of the oil reservoir to be subjected to dimension reduction processing, establishing an oil reservoir geometric model, and carrying out geometric subdivision on the oil reservoir geometric model through triangular grids to form discrete units; S200, establishing a shale reservoir fractured horizontal well fracturing fluid imbibition model based on the discrete fracture model; S300, simulating the fracturing fluid imbibition numerical value of the shale reservoir fractured horizontal well; and S400, based on the simulation result of the S300, determining the optimal well shut-in time.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, and in particular to a method for optimizing the shut-in time of a shale oil reservoir after fracturing. Background technique [0002] In today's era of commercial development of unconventional oil and gas such as shale oil, the staged fracturing development mode of horizontal wells of "large displacement + large liquid volume" is generally adopted at home and abroad. Although a large amount of fracturing fluid is injected into shale reservoirs, the flowback rate after fracturing is generally low, usually less than 30%. Analysis after flowback after on-site fracturing found that the longer the well shut-in time, the lower the flowback rate, but the initial daily production increased significantly. The best shut-in time after shale oil fracturing is mainly determined by the experience of engineers. Qualitative and quantitative understanding, if the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06Q50/02G06F111/10G06F119/14
CPCG06F30/23G06Q50/02G06F2111/10G06F2119/14
Inventor 徐荣利郭天魁曲占庆陈铭刘晓强王飞刘学伟徐建春
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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