Device and method for testing density of high-temperature and high-pressure cement paste

Abstract

The invention discloses a device and method for testing the density of high-temperature and high-pressure cement paste. The testing device comprises a sealed container, and a cement paste injection device, a pressurizing device, a heating device and a detection device which are respectively connected with the sealed container, and the sealed container is provided with a first pressure monitoring device; the cement paste injection device comprises a cement paste storage tank and a cement paste injection pump which are connected, the output end of the cement paste injection pump is connected with the sealed container through a first pipeline, and a first valve is arranged on the first pipeline; the pressurizing device comprises an air inlet pump and an air storage bottle which are connected, an air outlet of the air storage bottle is communicated with the sealed container through a second pipeline, and a second pressure monitoring device and a second valve are sequentially arranged on the second pipeline; and the detection device comprises a volume measuring instrument and a weight measuring instrument. According to the invention, the density of cement paste can be measured more accuratelyunder the stratum condition, and technical support is provided for field construction of an oil field.

Description

technical field [0001] The invention relates to the technical field of cement slurry detection in well cementing operations, in particular to a high-temperature and high-pressure cement slurry density testing device and method. Background technique [0002] Cementing operation is an indispensable and important link in drilling and completion operations, which includes casing running and cement injection. Cementing technology is a multi-disciplinary comprehensive application technology, which is systematic, one-time and short in time. Among them, cement injection is the key process after the casing is run into the well. Its function is to seal the annular space between the casing and the well wall to isolate the oil and gas water layer, so that the casing becomes a channel for oil and gas to enter the well. Among them, the cement slurry density has a great influence on the rheological properties, settlement stability, water loss, compressive strength and other aspects of the...

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Problems solved by technology

[0003] At present, there is no single implementation standard for cementing slurry density testing in China, and there are no convenient testing tools and corresponding testing methods suitable for oilfield sites

Especially in terms of the density measurement of cement slurry under high temperature and high pressure conditions, the relevant domestic experimental devices are not yet perfect, and there is still a lot of room for improvement

At the same time, the number of existing devices and methods for testing the density of cement slurry is relatively small, and most of them are tested for cement slurry in ordinary environments without simulating the actual formation environment, so it is difficult to truly calculate the density of cement slurry. True density, less accurate and less reliable test

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