Volume expansion and shrinking percentage testing device and method

Abstract

The invention discloses a volume expansion and shrinking percentage testing device and method. The device comprises a body and a cover body, wherein the body is used for containing a cement sample to be tested and provided with an opening end and a closed base back on to the opening end, the cover body is used for sealing the opening end, and a closed containing cavity is formed after the cover body and the body are matched in a sealed mode. The cover body is provided with an injection hole for inputting liquid into the containing cavity and a graduated tube communicated with the containing cavity, wherein the injection hole is provided with a detachable sealing mechanism; the graduated tube is provided with a first end and a second end opposite to the first end, the first end is communicated with the containing cavity, the second end is an opening end, and scale marks are arranged on the surface of the graduated tube. The volume expansion and shrinking percentage testing device and method are capable of accurately measuring the volume expansion and shrinking percentage, and the testing device is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to the field of shrinkage measurement of solidified oil well cement materials, in particular to a volume expansion and contraction rate testing device and method. Background technique [0002] In order to exploit the oil and gas resources contained in the formation, it is often necessary to drill a well and lead to the target formation to be exploited, so as to set up the exploitation equipment through the well. The wells drilled generally need to reinforce the well wall before mining, which is called cementing for short. The general process of cementing includes running casing in the well, and injecting and filling cement slurry in the annulus between the well wall and the casing. Through cementing operations, oil, gas and water layers can be isolated so that oil, gas and water do not cross each other, thereby ensuring normal oil and gas production during the mining process. During the cementing process, due to the hydration sh...

AI Technical Summary

Problems solved by technology

[0005] At present, the commonly used device for measuring the volumetric expansion and contraction rate is an expansion and contraction measuring instrument. Although it can measure the expansion and contraction rate of the cement slurry system, due to the gap between the measured cement slurry sample and the real-time acquisition system Too many transition pipelines will cause a large measurement error in the volume of the measured cement slurry sample during the collection process, resulting in a large error in the final volume expansion and contraction rate

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