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Experimental device and method for integrity evaluation of oil and gas well fracturing working condition pitshaft

An experimental method and integrity technology, applied in the direction of wellbore/well components, earthwork drilling, production fluid, etc., can solve the problems of complex failure mechanism of the wellbore and no effective method for evaluating the integrity of the wellbore, and achieve credibility high effect

Inactive Publication Date: 2015-11-11
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

The failure mechanism of wellbore integrity caused by fracturing is very complicated, and there is no effective method to evaluate the wellbore integrity under this working condition

Method used

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  • Experimental device and method for integrity evaluation of oil and gas well fracturing working condition pitshaft

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Embodiment Construction

[0009] In order to have a clearer understanding of the technical features and beneficial effects of the present invention, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings.

[0010] The invention provides an experimental device for evaluating the integrity of the wellbore in oil and gas well fracturing conditions, as shown in the accompanying drawings. The experimental device for wellbore integrity evaluation under fracturing conditions includes: gas compressor (1), high-pressure gas cylinder (2), water tank (3), internal pressure loading pipeline and high-pressure pump (4), external pressure loading pipeline and high-pressure pump (5), pressure gauge (6), external pressure cylinder liner (7), strain sensor (8), computer (9), air pressure sensor (10), ohmmeter (11), three-way loading hydraulic cylinder (12), Perforation hole (13), casing (14), cement sheath (15), rock mass (16) and hydraulic control modu...

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Abstract

The invention provides an experimental device for integrity evaluation of an oil and gas well fracturing working condition pitshaft. The outer portion of an external pressure cylinder sleeve is connected with an external pressure loading pipeline and a high-pressure pump, and a three-dimensional loading hydraulic cylinder is arranged in the external pressure cylinder sleeve and connected with a hydraulic control module. A rock mass and pitshaft physical model is placed in the middle of the three-dimensional loading hydraulic cylinder and composed of a sleeve, a cement ring, a rock mass and a perforation hole. A sleeve inlet is connected with an internal pressure loading pipeline and a high-pressure pump and further connected with a high-pressure gas cylinder and a gas compressor, an outer wall of the sleeve is connected with a strain sensor, and the cement ring is internally connected with an air pressure sensor and an ohmmeter. The invention further provides an experimental method for evaluating pitshaft integrity by utilizing the device. According to the experimental device and method for integrity evaluation of the oil and gas well fracturing working condition pitshaft, the oil and gas well fracturing and production process can be simulated, the integrity evaluation result of the fracturing working condition pitshaft is high in credibility, and the experimental basis is provided for oil and gas well sleeve design, well cementation and fracturing parameter optimization.

Description

technical field [0001] The invention relates to an experimental device and method in the field of oil and gas well engineering, which can evaluate the wellbore integrity of oil and gas well fracturing conditions. Background technique [0002] Oil and gas well fracturing is an effective way to develop unconventional oil and gas resources. By injecting fracturing fluid, oil and gas reservoirs can be fractured, thereby reducing the flow resistance of oil and gas. While fracturing the oil and gas reservoir, it also increases the risk of wellbore failure. For example, 12 shale gas horizontal wells were fractured, and casing deformation occurred in 8 of them. Wellbore integrity is essential for the safe and efficient extraction of oil and gas resources. The failure mechanism of wellbore integrity caused by fracturing is very complicated, and there is no effective method to evaluate the wellbore integrity under this working condition. Contents of the invention [0003] In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B47/00E21B47/11E21B49/00
Inventor 尹飞高德利刘奎
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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