Method for judging temporary plugging times of segmented multi-cluster fracturing wellbores of directional well and horizontal well

A technology for fracturing wells and directional wells, which is applied in the field of judging the number of temporary plugging times of multi-cluster fracturing wellbore in directional wells and horizontal wells

Active Publication Date: 2019-12-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

At present, there are few studies on determining the number of temporary plugging at home and abroad, so there is an urge

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  • Method for judging temporary plugging times of segmented multi-cluster fracturing wellbores of directional well and horizontal well
  • Method for judging temporary plugging times of segmented multi-cluster fracturing wellbores of directional well and horizontal well
  • Method for judging temporary plugging times of segmented multi-cluster fracturing wellbores of directional well and horizontal well

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Embodiment Construction

[0157] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0158] On the one hand, a method for judging the number of times of temporary plugging of multi-cluster fracturing wellbore in a directional well is provided, including the following steps:

[0159] established as figure 1 The shown physical model of wellbore fracture initiation in directional wells, when the physical model is established, the following assumptions are made:

[0160] (1) The rock is a porous medium in a linear elastic state;

[0161] (2) The flow of fluid in porous media complies with Darcy's law;

[0162] (3) The physical and chemical interaction between the fracturing fluid and the rock is not considered to cause changes in the mechanical properties of the rock.

[0163] Establish a corresponding stress mathematical model according to the physical model, specifically: first establish a (x, y, z) space coordinate system, convert th...

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Abstract

The invention discloses a method for judging the temporary plugging times of a segmented multi-cluster fracturing wellbore of a directional well and a horizontal well. The method for the directional well comprises the following steps: building a physical model of fracture initiation of the wellbore of the directional well; establishing a corresponding stress mathematical model; calculating the fracture pressure during fracture initiation; determining the fracture initiation number by utilizing a current limiting principle; subtracting 1 from the ratio of the designed perforation cluster numberto the fracture initiation number by adopting a ceil method to obtain a temporary plugging time; the method for the horizontal well comprises the following steps: obtaining rock mechanical parameters; establishing a dynamic and static relation model of rock mechanics parameters; calculating a tectonic stress coefficient; calculating the minimum horizontal principal stress and the maximum horizontal principal stress; calculating the fracture pressure during fracture initiation; determining the fracture initiation number by utilizing a current limiting principle; subtracting 1 from the ratio ofthe designed perforation cluster number to the fracture initiation number by adopting a ceil method to obtain the temporary plugging times. According to the method, the temporary plugging times of the segmented multi-cluster fracturing wellbores of the directional well and the horizontal well can be accurately judged.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and in particular relates to a method for judging the number of times of temporary blockage of multi-cluster fracturing well bores in directional wells and horizontal wells. Background technique [0002] Temporary plugging is mainly aimed at shale reservoirs. Shale gas is an important part of unconventional oil and gas resources. Its special storage mode and reservoir structure provide a way to break up reservoirs, increase SRV (effectively stimulated volume), and greatly increase High-permeability passages are used to increase production, and horizontal well segmented multi-cluster fracturing technology can meet the above-mentioned modification requirements. Therefore, horizontal well segmented multi-cluster fracturing has become the main development method for shale gas stimulation. [0003] With the development of shale gas exploration and development, from the p...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02
CPCG06Q50/02
Inventor 邓燕周超刘彧轩郭建春曾凡辉何杰
Owner SOUTHWEST PETROLEUM UNIV
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