A simulation test device for preventing gas channeling in the later stage of cementing

Abstract

The invention discloses an anti-gas-channeling simulation test apparatus in a later stage of well cementation. The apparatus comprises a bearing rod, a cement sheath inner tube, a cement sheath outer tube and a shell which are arranged in order from inside to outside, wherein a first sealing cavity is formed between the bearing rod and the cement sheath inner tube; the inner cavity of the bearing rod is communicated with the first sealing cavity; the inner cavity of the bearing rod is communicated with a first connecting hole for injecting a medium; a second sealing cavity is formed between the cement sheath inner tube and the cement sheath outer tube; the second sealing cavity is communicated with a second connecting hole for injecting the medium; a third sealing cavity is formed between the cement sheath outer tube and the shell; and the third sealing cavity is communicated with a third connecting hole for injecting the medium. The apparatus can simulate the size of hardened cement paste in full-scale, simulate loading conditions of the hardened cement paste in all directions and study sealing completeness of the hardened cement paste, is convenient for taking specific measures to improve a cement slurry system, and is helpful for increasing the anti-gas-channeling performance in the later stage of the hardened cement paste, thereby increasing the quality of the well cementation.

Description

technical field [0001] The invention relates to a simulation test device for preventing gas channeling at the later stage of well cementing, which belongs to the field of engineering simulation tests for well cementing operations in oil and gas fields. Background technique [0002] The gas channeling discussed in cementing refers to a phenomenon that gas passes through the filter cake from the formation, invades the annular space, and escapes to the wellhead due to the sealing defect of the annular space after well cementing. Statistics at home and abroad show that gas channeling is a difficult problem that almost all natural gas wells will face. With the prolongation of the production time of natural gas wells, the annular air channeling and pressure of domestic natural gas wells are becoming more and more serious. In the four gas regions of Tarim, Sichuan-Chongqing, Daqing Qingshen, and Jilin Changshen, the annular air channeling and belt pressure of natural gas wells hav...

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Problems solved by technology

American Kindle Corporation developed the FMA7150 gas channeling evaluation instrument, which can simulate the process of cement slurry dehydration and gas channeling. The maximum working pressure limit (maximum working pressure 10MPa) cannot carry out the anti-channeling simulation test of cement under high pressure conditions

A simulation device represented by the OWC-0480 oil well cement weight loss and gas channeling evaluation instrument has been developed in China. It mainly analyzes the weight loss and gas channeling of cement slurry through simultaneous tests. The structure is similar to that of the FMA7150 gas channeling evaluation instrument. Sealing performance

Daqing Drilling Company developed a casing cement sheath structural integrity test device in 2011, which can analyze the influence of pressure changes in the pipe on the integrity of the cement sheath, but the device cannot apply confining pressure, cannot simulate the effect of the formation on the cement sheath, and cannot scientifically evaluate cement Late anti-channeling ability

[0004] To sum up, most domestic anti-channeling simulation instruments are used to evaluate the anti-channeling ability of cement slurry, but cannot carry out the anti-channeling simulation of cement stone in the later stage. Although other devices can analyze the anti-channeling ability of cement stone in the later stage, the wellbore structure is simple and cannot be simulated. The application of confining pressure cannot simulate the effect of the formation on the cement stone, and cannot scientifically simulate the anti-channeling performance of the cement stone in the later stage

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