Testing device for packing ability and cementing strength of full-dimensional cement ring and testing method thereof

Abstract

The invention provides a testing method of a testing device for packing ability and cementing strength of a full-dimensional cement ring. The testing method comprises the following steps of arranginga kettle cover and a kettle bottom separately at the upper and lower ends of a full-dimension sleeve; mounting a top pressure sensor on the kettle cover; mounting a bottom pressure sensor at the kettle bottom, further forming a bottom gas injection port in the kettle bottom, and connecting the bottom gas injection port to a nitrogen bottle through a pipeline; paving sand in and at the bottom of the full-dimension sleeve, placing a core in the full-dimension sleeve on the sand, and pouring cement paste into an annular space between the full-dimension sleeve and the core to form the cement ring;and coating the full-dimension sleeve with insulation cotton and a heating sleeve, and connecting a control system of the heating sleeve to a computer. The testing device further comprises an ultrasonic measuring probe mounted on the outer side of the full-dimensional sleeve to test a combination body of the core, the cement ring and the full-dimension sleeve ultrasonically. The testing method achieves tests of cementing strength and packing ability of the full-dimension cement ring directly while simulating a maintenance process of the full-dimension cement ring at different temperatures andpressures.

Description

Technical field [0001] The invention relates to the technical field of cement slurry performance evaluation for petroleum cementing operations, and specifically relates to a test method for a full-scale cement ring sealing capacity and cementing strength testing device, which measures the cement ring sealing capacity and cementing strength, especially the device establishes a stratum -The full-scale model of the cement ring-casing to accurately simulate the actual downhole environment. Background technique [0002] Cement ring failure is an important mechanism that triggers wellbore integrity risks. As an important part of the wellbore barrier, the quality of the cement ring is a key factor that determines the safety of oil and gas wells. Production practice shows that the failure of the downhole cement ring seal often leads to wellhead channeling, wellhead annulus pressure, or deterioration of the quality of the corresponding interval cementation logging. Under extreme condition...

AI Technical Summary

Problems solved by technology

At present, the test methods of cement sheath sealing capacity and cementation quality often use the "one-shot-one-retract" acoustic wave probe and the casing-cement sheath-formation combination model, and the frequency of the "one-shot-one-receive" acoustic wave probe is between 10-20Hz. The wavelength is about 14-20m, and the casing-cement sheath-formation model required for continuous measurement requires relatively large rocks; if casing is used instead of rock, it cannot satisfy the simultaneous simulation of casing-cement under the condition of using a full-scale cement sheath. When the cement sheath is maintained under different temperature and pressure conditions, the conventional CBL / SBT direct measurement tools cannot be lowered into the pressurized confined space when there are two cemented surfaces between the ring and the formation; the error may be magnified after inversion using indirect measurement results. lead to further distortion of the evaluation results

Images