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Casing buckling evaluation system in inclined shaft cementing process

An evaluation system and bushing technology, which is applied in the testing of measuring devices, instruments, machines/structural components, etc., can solve the problems of ineffective evaluation of buoyancy effects and unclear effects of bushing effects, etc., and achieves simple structure and good feasibility , the effect of convenient operation

Active Publication Date: 2020-07-03
XINJIANG ZHENGTONG OIL & GAS CO LTD
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Problems solved by technology

[0003] At present, the effect of buoyancy on casing is usually calculated by empirical formulas in the field. However, due to the complex casing stress and various well paths in the actual well site, the effect of a single variable on casing is not clear, so it is impossible to calculate the effect of buoyancy on casing. Efficient evaluation of the impact of casing

Method used

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  • Casing buckling evaluation system in inclined shaft cementing process

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Embodiment Construction

[0035] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] The casing buckling evaluation system in the cementing process of deviated wells proposed by the embodiment of the present invention defines a cavity through the borehole wall simulation unit to simulate the borehole wall, and controls the borehole wall simulation unit to be in an inclined state through the inclination control unit to realize deviated well simulation , so that in the process of controlling the flow of cement slurry into the cavity, the hollow casing is affected by the buoyancy of the cement slurry, and the hollow casing is analyzed by detecting the vertical tension, torque and displacement of the hollow casing, and the pressure value detected by the annular pressure sensor. The stress change process of the tube can be used to monitor and ...

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Abstract

The invention relates to a casing buckling evaluation system in an inclined shaft cementing process. The system comprises a well wall simulation unit and an inclination control unit, the well wall simulation unit defining a cavity to simulate a well wall, and the inclination control unit controlling the well wall simulation unit to be in an inclined state; a hollow sleeve extending into the cavity; a sleeve fixing device used for fixing the top of the hollow sleeve; a sleeve shoe, arranged at the bottom of the cavity and connected with the bottom of the hollow sleeve so as to seal the hollow sleeve; a Cement paste storage and collection device, a cement paste control valve being arranged on the cement paste storage and collection device so as to control cement paste in the cement paste storage and collection device to flow into the cavity; a well bottom sleeve, connected with the well wall simulation unit; an annulus pressure sensor; and a detection device, used for detecting the vertical tension, torque and displacement of the hollow sleeve so as to perform buckling evaluation on the hollow sleeve according to the pressure value detected by the annular pressure sensor and the vertical tension, torque and displacement of the hollow sleeve. The system is simple in structure, simple and convenient to operate and good in feasibility.

Description

technical field [0001] The invention relates to the technical field of drilling process, in particular to a casing buckling evaluation system in the cementing process of deviated wells. Background technique [0002] Cementing is a late process in drilling engineering, the purpose is to form a cement sheath between the outer wall of the casing and the wellbore, and provide a foundation for later oil well development. During the cementing process, it is necessary to inject pre-fluid, cement slurry, post-fluid, etc. into the hollow casing, so that the liquid such as cement slurry returns from the bottom of the casing and finally fills the annulus. However, during the cement slurry injection process, the height of the liquid column inside the casing is gradually decreasing, while the height of the liquid column in the annulus is constantly rising, and the buoyancy generated by the difference in the liquid level inside and outside the casing will affect the casing. When the casi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00
CPCG01M99/00
Inventor 牟善波李靖王晓宏李先林韩秀玲郑龙薛志龙冶霆汉
Owner XINJIANG ZHENGTONG OIL & GAS CO LTD
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