Casing buckling evaluation system in the cementing process of deviated wells

Abstract

The invention relates to a casing buckling evaluation system in the cementing process of a deviated well, comprising: a well wall simulation unit and an inclination control unit, the well wall simulation unit defines a cavity to simulate the well wall, and the inclination control unit controls the well wall simulation unit to be in the Inclined state; hollow casing, which extends into the cavity; casing fixing device, used to fix the top of the hollow casing; casing shoes, arranged at the bottom of the cavity, and connected with the bottom of the hollow casing to Sealed hollow casing; cement slurry storage device, with a cement slurry control valve on it to control the flow of cement slurry in the cement slurry storage device into the cavity; bottom hole sleeve, connected with the well wall simulation unit; annular space Pressure sensor; detection device for detecting the vertical tension, torque and displacement of the hollow casing, so as to evaluate the buckling of the hollow casing according to the pressure value detected by the annular pressure sensor and the vertical tension, torque and displacement of the hollow casing , simple structure, easy operation and good 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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