System and method for evaluating damage on reservoir by cement slurry

Abstract

The invention provides a system and a method for evaluating the damage on reservoir by cement slurry. The system comprises a cement slurry pollution device, a stratum environment simulation device, arock core fixation device and a control device, wherein the control device is connected to the cement slurry pollution device, the rock core fixation device is respectively connected to the cement slurry pollution device and the stratum environment simulation device, the control device is used for setting the working parameters for the cement slurry pollution device, the rock core fixation deviceis used for fixing rock so as to make one end surface of the rock contact the test solution in the cement slurry pollution device and make the other end surface of the rock core contact the stratum water in the stratum environment simulation device, and the pressure difference between the two end surfaces of the rock core is the pressure difference between the wellbore and the stratum during cementing. According to the present invention, with the evaluation system, the accuracy of the evaluation of the damage on the reservoir by the cement slurry is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a system and method for evaluating the damage of cement slurry to reservoirs. Background technique [0002] Well cementing is an indispensable and important link in the drilling operation process, including casing running and cement injection. The purpose of cementing is to protect and support the casing in the oil and gas well, and to seal off the oil, gas and water layers. However, during the cementing process, the filtrate and solid particles of the cement slurry system will cause damage to the reservoir. Once the damage is formed, it will affect the quality of cementing and the productivity of oil and gas wells. Therefore, it is of great significance to accurately evaluate the damage degree of cement slurry to reservoirs to protect reservoirs and improve oil recovery. [0003] At present, the evaluation method of cement slurry damage to the reservoir usually ...

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Problems solved by technology

[0003] At present, the evaluation method of cement slurry damage to the reservoir usually adopts the industry standard in the petroleum industry. However, in the industry standard, only the evaluation standard of the filtrate damage to the reservoir in the cementing part is not applicable to the evaluation of cementing cement. Relevant standards for the degree of slurry damage to the reservoir make the evaluation accuracy of the cement slurry damage to the reservoir low

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