Method and device for testing performance of self-repairing material for well cementation

Abstract

The invention relates to a method for testing the performance of a self-repairing material for well cementation. The method comprises the following steps: respectively weighing the weight of a sieve tube and a self-repairing material sample; putting the self-repairing material sample into the sieve tube, suspending and fixing the sieve tube in a kettle body; controlling the pressure in the kettle body to be 0.1-10 MPa and the temperature to be 0-200 DEG C, filling stimulated gas or liquid into the kettle body, so that the self-repairing material sample reacts with the stimulated gas or the liquid; after the completion of reaction, weighing the weight of the sieve tube and the self-repairing material sample and calculating the expansion rate of the self-repairing material sample. The method has the benefits that the expansion effect of the self-repairing material meeting with oil and gas can be evaluated under the situation of oil and gas immersion, the operation is simple and convenient, and the test is accurate.

Description

technical field [0001] The invention relates to a testing method and testing device for the performance of well cementing self-repairing materials. Background technique [0002] In the process of oil field cementing, due to the influence of the external environment, the sealing performance of the cement sheath is often destroyed, that is, micro-gap and micro-cracks are generated at the cementation interface, thereby forming the channeling of downhole formation fluid (especially natural gas). flow channel, resulting in the failure of interlayer isolation; the basic method to solve the problem of formation fluid channeling in oil and gas wells is to use the repair method of cement extrusion and workover with high cost, but the success rate of this method is low, and it is easy to occur during the construction process. Accidents; therefore, various research institutions have established a mechanism that can instantly repair the micro-cracks and micro-gap of the cement sheath by...

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Problems solved by technology

[0002] In the oil field cementing process, due to the influence of the external environment, the sealing performance of the cement sheath is often destroyed, that is, micro-gap and micro-cracks are generated at the cemented interface, thereby forming the channeling of downhole formation fluid (especially natural gas). flow channel, resulting in the failure of interlayer isolation; the basic method to solve the problem of formation fluid channeling in oil and gas wells is to use the repair method of cement squeezing and workover with high cost, but the success rate of this method is low, and it is easy to occur during the construction process. Accidents; therefore, various research institutions have established a mechanism that can instantly repair the micro-cracks and micro-gap of the cement sheath by studying the self-repair mechanism and technology of the cement sheath of oil and gas wells, that is, no matter when and what The gas channeling channel caused by the cause can be timely and effectively, and the mechanism of dynamic automatic repair can always ensure the sealing effectiveness of the cement sheath of the natural gas well. However, there is currently no testing device and method for the performance of cementing self-repairing materials. , which hinders the study of the self-healing performance of the cement sheath of oil and gas well cementing

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