An evaluation device and experimental method for the cementation quality of the second interface of well cementing
An evaluation device and interface glue technology, which is applied in the direction of measuring devices, mechanical devices, and test sample preparation, can solve the problems of small core size and excessive core demand, and achieve the effect of accurate characterization
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Embodiment 1
[0033] An evaluation device for cementing quality of the second interface of well cementing, comprising a kettle body 10, a rock core 11 is arranged inside the kettle body 10, a cement sheath 12 is arranged between the rock core 11 and the kettle body 10; a core cap 13 is set on the top of the rock core 11, A gap 14 is provided between the lower edge of the core cap 13 and the cement sheath 12; a wool pad 15 is provided at the bottom of the rock core 11; the cement sheath 12 and the kettle body 10 form a first cemented interface 16, and the rock core 11 and the cement sheath 12 form a second cemented interface 17. The gap 14 allows the second interface gas channeling gas to escape, and the center of the core cap 13 has holes and pipelines connected with the core body permeating gas channel, so that the gas channeling through the second interface can be separated from the gas permeating from the core 11 itself.
[0034] In order to simulate the influence of formation temperatur...
Embodiment 2
[0042] Adopt the experimental method of the evaluation device of a kind of cementing second interface cementing quality described in embodiment 1, comprise the steps:
[0043] 1) Preparation of mud cake: drying the core 11, putting it into a core vacuum saturation device, vacuuming, saturating the formation drilling fluid in a vacuum environment, and simulating the formation of formation mud cake on the outer surface of the core;
[0044] 2) Flushing: After the mud cake is formed, the rock core 11 is put into the device and fixed, and the flushing fluid commonly used in cementing is pumped in from the high-pressure gas pipeline 32, and the gas channeling from the first interface to the gas collection port 24, the second interface gas The channeling gas collection port 26 and the core body infiltration gas collection port 25 flow out, and last for a period of time, then release the flushing fluid and replace it with the spacer fluid, and release all the liquid in the device afte...
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