Casing Buckling Evaluation Method in Deviated Well Cementing Process

Abstract

The invention relates to a casing buckling evaluation method in the cementing process of a deviated well, which comprises the following steps: controlling the well wall simulation unit to be in a tilted state through a tilt control unit to simulate the deviated well; controlling the opening of the cement slurry control valve to control the storage of the cement slurry The cement slurry in the collection device flows into the cavity; detect the vertical tension, torque and displacement of the hollow casing, and record the pressure value detected by the annular pressure sensor; according to the pressure value detected by the annular pressure sensor and the vertical direction of the hollow casing The tension, torque and displacement are used to evaluate the buckling of the hollow casing. By analyzing the stress change process of the hollow casing, the monitoring and evaluation of the buckling of the hollow casing is realized. It is not only easy to realize, convenient to operate, but also good in feasibility. Quickly and quantitatively evaluate the effect of cement slurry buoyancy on the stress change of hollow casing during the cementing process of deviated wells, and achieve the purpose of casing buckling evaluation.

Description

technical field [0001] The invention relates to the technical field of drilling process, in particular to a casing buckling evaluation method 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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