A casing air tightness detection system

Abstract

The invention discloses a casing air tightness detection system, which comprises a high pressure unit, a mixing unit and a pneumatic winch unit, wherein the high pressure unit comprises an electric air compressor, an air storage tank and a dry filter , the mixing unit includes a nitrogen generator and a helium cylinder, a first pressure reducer is provided downstream of the nitrogen generator, a second pressure reducer is provided downstream of the helium cylinder, the first pressure reducer and the second pressure reducer The outlets of the mixers are all connected with a mixing instrument, an electric supercharger is arranged downstream of the mixing instrument, and a gas cylinder is arranged downstream of the electric supercharger; the pneumatic winch unit includes a winch control operating system and a secondary gas booster The compressor, the winch control operating system and the secondary gas booster are all connected to a pneumatic winch, a packer is connected to the pneumatic winch, and the thread of the packer is connected to a helium leak detector. The casing air tightness detection system of the invention detects the casing at the well head, and the detection result has high reliability.

Description

technical field [0001] The invention relates to an oil well equipment, more precisely, a casing air tightness detection system. Background technique [0002] In the inner casing gas seal testing standard, the hydraulic-pneumatic power system is recommended. The main problems of this testing system are: large volume (pressurized system), high cost, low testing efficiency, and testing equipment may fail. When water vapor is mixed into the detection gas, it is easy to cause damage to the detection equipment. Since the helium-nitrogen mixed gas used for detection is manually proportioned, the efficiency is low. In addition, since the detection tool-packer has not formed a mature product, its performance is unstable, and there is a lack of technical means for on-site detection of the performance and working conditions of the packer, there are potential safety hazards in the casing airtightness detection process, and the detection results are unreliable. Strong persuasion. In a...

AI Technical Summary

Problems solved by technology

[0002] In the inner casing gas seal testing standard, the liquid-pneumatic power system is recommended. The main problems of this testing system are: large volume (pressurized system), high cost, low testing efficiency, and testing equipment will fail

When water vapor is mixed into the detection gas, it is easy to cause damage to the detection equipment

Since the helium-nitrogen mixed gas used for detection is manually proportioned, the efficiency is low

In addition, since the detection tool-packer has not formed a mature product, its performance is unstable, and there is a lack of technical means for on-site detection of the performance and working conditions of the packer, there are potential safety hazards in the casing airtightness detection process, and the detection results are unreliable. Strong convincing

In addition, the detection process is unreasonable, resulting in low detection efficiency

Images