Device and method for monitoring pressure of foamed cement slurry during waiting for cement setting

Abstract

The invention provides a device and method for monitoring the pressure of foamed cement slurry during waiting for cement setting. The device comprises a first sampling pup joint and a second samplingpup joint which are connected together through a first connector, wherein the first sampling pup joint comprises a first sampling barrel, a first pressure gauge arranged on the first sampling barrel,and a first throttle valve and a third throttle valve which are arranged at the two ends of the first sampling barrel; the second sampling pup joint comprises a second sampling barrel, a second pressure gauge arranged on the second sampling barrel and a second throttle valve arranged at one end of the second sampling barrel; one end of the first connector is connected with the second throttle valve, and the other end of the first connector is connected with the third throttle valve. The pressure change rule of the foamed cement slurry under different gas-liquid ratios and different temperatureand pressure can be obtained, and a reliable and safe research means is provided for deep research of the foamed cement slurry under different underground gas-liquid ratios, different temperatures and different pressures.

Description

technical field [0001] The invention relates to the technical field of foam cement slurry pressure monitoring, in particular to a pressure monitoring device and method during the waiting period of foam cement slurry. Background technique [0002] At present, due to the inaccuracy of the gas phase model, there are still large errors in the calculation of the density of the foamed cement slurry using the physical property model. In the engineering field, only when the pressure change of the foamed cement slurry at different densities is predicted more accurately, can appropriate technological measures be taken. To achieve a better construction effect. [0003] Chinese patent number CN101526445A "Thread Control Type High Pressure Environmental Liquid Sampler" and CN202676565U "A Nitrogen Foam Cement Slurry Density Meter" can only measure the density under fixed pressure, and cannot detect the variation of variable density slurry with pressure. [0004] Chinese Patent No. CN102...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the inaccuracy of the gas phase model, there are still large errors in the calculation of the density of the foamed cement slurry using the physical property model. In the engineering field, only when the pressure change of the foamed cement slurry at different densities is predicted more accurately, can appropriate technological measures be taken. To achieve better construction effect

[0003] Chinese patent number CN101526445A "thread control type high-pressure environment liquid sampler" and CN202676565U "a kind of nitrogen foam cement slurry density meter" can only measure the density under the fixed pressure, and cannot detect the variation of the variable density slurry with the pressure

[0004] Chinese patent number CN102539280A "A Device for Testing the Density of Heated and Pressurized Foam Cement Slurry" relates to a device with a self-pressurizing and heating function, which is tested by electronic control, and has complex structure, complicated operation and high cost

[0005] The density measurement device involved in the US Patent No. US5974858 "Single Flange Installation Densimeter" must be installed on the pipeline to be tested, and cannot be continuously pressurized, and can only passively measure the density under temperature and pressure here.

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