Casing buckling evaluation system in inclined shaft cementing process

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...

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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

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