Test method for simulating restoration of deformation sleeve under stratum confining pressure

Abstract

The invention provides a test method for simulating restoration of a deformation sleeve under stratum confining pressure. The test method is characterized in that a universal hydraulic tester with a YS32-500 tetragonal column is used to generate external force by moving back and forth up and down, an impact reshaping tool fixed at the top center of the hydraulic tester is allowed to be fixed on the deformation sleeve right at the center of the bottom of the hydraulic tester by impact at certain speed, and reshaping force required in restoring the deformation sleeve and tension required by a lifting tool after reshaping of the impact reshaping tool can be tested by a strain plate and a static strain gauge in reshaping process. The deformation sleeve is provided with a clamping tool at a deformation section, and test of restoration of the deformation sleeve under specific confining pressure can be simulated by adjusting magnitude of torque of a bolt on the deformation sleeve. Restoration of the downhole deformation sleeve can be simulated truly, test result is accurate, and accurate construction parameters can be provided for restoration of the sleeve by a pear-shaped tube expander. The test method is suitable for the technical field of oil, natural gas downhole sleeve restoration.

Description

technical field [0001] The invention relates to a test method for simulating the repairing process of a deformed casing under formation confining pressure. Background technique [0002] Casing is a necessary key tool in the process of oil and gas extraction, which plays a role in supporting the well wall and establishing oil and gas passages in the process of oil and gas extraction. However, after a period of production in many oil and gas fields, due to factors such as geology, engineering, and corrosion, many oil and gas wells have casing damage to varying degrees, which seriously affects the safety or normal production of oil and gas fields. The main form of bushing damage is the necking deformation of the bushing, that is, the cross section of the deformed section of the bushing is elliptical. In order to restore the normal production of oil and gas fields, scientific workers have developed many plastic repair tools for the repair of necked and deformed casings, such as...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a test method for simulating the repairing process of deformed casing under formation confining pressure, so as to solve the problem of the shaping force and upper pressure required by various impact shaping tools for repairing deformed casing under different formation depths and different confining pressures. The technical problem that the pulling force is difficult to control accurately, and while achieving the above goals, simplify the complexity of the test system and reduce the cost of equipment

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