Measuring device and measuring method for well-cementing annular weight loss of cement slurry

Abstract

The invention relates to a measuring device and measuring method for well-cementing annular weight loss of cement slurry. The device is mainly composed of a base, a control panel, an upright strut, a slurry cylinder and a computer, wherein the upright strut is connected with the slurry cylinder through a support shaft and with the control panel through a rotating shaft; the slurry cylinder is provided with a pressurizing hole, an inner cylinder, an outer cylinder and an annular space between the inner and outer cylinders; the slurry cylinder is a segmented combination with each segment provided with a temperature sensor, a pressure sensor and a heating cooling jacket; the slurry cylinder controls the eccentricity of the inner cylinder through an eccentric cover, three pressure sensors arearranged at the lower part of the slurry cylinder; and the temperature sensors and the pressure sensors respectively transmit data to the computer. The invention can simulate different temperature differences of downhole temperature changing along with hole depth, and acquisition and regulation are controlled by the computer, so that the operation is simple and convenient; the eccentricity of thesleeve is controlled by the eccentric cover, so that the safety, stability and reliability are ensured; and the measuring device and the measuring method are suitable for operations such as petroleumand natural gas well cementation, cement extrusion, cement injection and the like.

Description

technical field [0001] The invention relates to a weightless measuring device and a measuring method for simulating the coagulation process of annular cement slurry under the conditions of different well depths, different annular space gaps and different well inclination angles, and is suitable for annular cement slurry in oil and natural gas well cementing operations after cementing Research on the laws of weightlessness and gas channeling. Background technique [0002] During oil and natural gas exploration and development drilling, when the drill bit reaches a certain depth, the drill bit needs to be pulled out from the well, and a hollow steel pipe string called a casing is inserted into the well, and then inserted between the wellbore and the casing. Cement slurry is injected into the annular space of the well, and the well wall is consolidated after static solidification, which is referred to as cement injection. When the cement injection is just completed, the cement...

AI Technical Summary

Problems solved by technology

In my country's Longgang, Sichuan, Tarim Basin, Xinjiang, and Daqing Qingshen gas fields, many wells have gas channeling and pressure phenomena every year, and it has not been well resolved so far.

The essential reason is that the understanding of the law of weightlessness is not clear. The root cause is that the existing devices have not been able to simulate the underground working conditions to test the law of weightlessness. not obvious

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