A testing device for the deformation of metal casing during the curing process of cement slurry

Abstract

The present invention relates to a metal casing deformation test device during cement slurry curing process, comprising a high-temperature autoclave 1, an air compression pump 2, a cement slurry mixing storage container 3, a hydraulic booster 4, and a casing deformation measuring scale And computer and data display system 7, heat transfer oil inlet 21 and pressure sensor 20 are set at the left end of high temperature autoclave 1, heat transfer oil return port 28 and heater 31 are set at the right end; The cement slurry pump inlet 26 is set at the bottom; there is a simulated casing slurry cylinder in the kettle; the heater, thermocouple, and pressure sensor are connected to the computer and the data display system 7; the casing deformation measuring ruler includes a lateral deformation measuring ruler 33 and a longitudinal deformation measuring ruler 34 , respectively detect the lateral and longitudinal deformation of the simulated casing. The invention has a reliable principle and a reasonable structure, and can test the deformation of the casing caused by the expansion of cement slurry under different temperatures and pressures.

Description

technical field [0001] The invention relates to a test device for simulating and measuring the deformation of a metal casing caused by the heat release of hydration reaction of cement slurry in the field of oil and gas well cementing during formation curing. Background technique [0002] The main function of the casing in the oil and natural gas production process is to isolate the formation pressure and protect the tubing. Once the casing is deformed, damaged or cracked, it will directly affect the production life of the oil and gas well. [0003] One of the keys to mining in the oil and gas industry is the bonding interface between the casing and the cement. During the curing process after the cement enters the formation, the hydration reaction of the cement itself in the oil and gas well is an exothermic reaction. The release of heat causes its temperature to rise sharply, and its volume will expand accordingly. The casing that is in close contact with the cement will al...

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Problems solved by technology

The casing that is in close contact with the cement will also undergo corresponding deformation under the change of pressure. If the deformation exceeds the standard, the casing will be damaged, which will increase the difficulty of the mining operation and even affect the safety of the project.

[0004] Although petroleum expansion casings have been used in many oil and gas wells, there is still no unified scientific evaluation method for laboratory testing of metal casing deformation

Most of them stay in the aspect of casing deformation caused by digital simulation calculation mechanics, but there will always be certain errors between the parameters set by the simulation calculation formula and the real environment of on-site construction, so that the results cannot always perfectly fit the construction site. The obtained formula is relatively consistent under certain conditions. If the mining site is changed or the conditions are different, the applicability of the formula will be problematic.

[0005] At present, there is still a method of subsidy (leakage repair) to make up for the cracks and cracks that appear after the casing deformation is too large, but no matter whether the bellows subsidy technology or the casing subsidy reinforcement technology is used, there will be obvious deficiencies, and the corrugated pipe wall is thin , easy to deform, the repair effect is greatly limited, and the reinforcement effect of casing subsidy reinforcement technology is also average

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