Composite coiled tubing with cable oil-water well casing leakage detection system and method

Abstract

The invention discloses a composite coiled tubing with cable oil-water well casing leakage detection system and a method. The system and the method are characterized in that any section of an oil wellcasing can be separated and sealed through an upper hydraulic packer assembly and a lower hydraulic packer assembly, so that the problems that according to an existing leakage detection method, due to the fact that a packer cannot be subjected to setting, testing cannot be conducted; and packer failure is caused by frequent tubular column tripping operations are solved; and the pressure and temperature in a shaft are tested through an underground temperature and pressure sensor, water injection operation is conducted in the position, at the closed part of the upper hydraulic packer assembly and the lower hydraulic packer assembly, of the oil well casing through a water injection system, and the leakage detection work of the oil-water well casing is completed by recording injection pressure and flow. According to the system and the method, the problems that a common casing water exploration packer is large in setting position error, the packer is continuously and repeatedly subjected to setting, and unsetting and setting effect verifying are difficult are solved; the problems that testing cannot be conducted due to the fact that the packer cannot be subjected to setting, and the packer failure is caused by frequent tubular column tripping operations are solved; and the technical difficulty is small, a large amount of software using cost is avoided, and the oil-water well repairing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to oil and water well post treatment technology in oil development, in particular to a composite continuous tubing and cable oil and water well casing leak detection system and method. Background technique [0002] During the oil field development process, because the casing is located in the formation for a long time, the surrounding environment is very complicated. Because the water in the formation and the upper formation contain a lot of corrosive substances, some oil and water well casings are damaged and ruptured. In the formation with water, the formation water directly When entering the wellbore, due to the rise of the wellbore liquid level under the action of the water column pressure, the oil in the development layer cannot be displaced into the wellbore, resulting in the problem that the oil well produces little or no oil. Determination of water leakag...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a composite continuous umbilical oil-water well casing leak detection system and method, which solves the problems of existing leak detection methods that cannot be tested because the packer cannot be seated and the string packer fails frequently. ; Low technical difficulty, reducing the cost of oil and water well repair

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