A kind of airtightness detection device and detection method of casing type oil and casing

Abstract

The invention discloses a jacket-type oil casing air tightness detection device and a detection method. The jacket-type oil casing air tightness detection device comprises an upper end cover, an upper central pipe, an adjusting joint, a lower central pipe and a lower end cover. Through holes are formed in central positions of the upper central pipe and the lower central pipe and are connected through the adjusting joint. One side of the adjusting joint is provided with a first high-pressure soft pipe joint. The inner walls, provided with the through holes, of the upper central pipe and the lower central pipe and are provided with grooves, and glue cylinders and extruding mechanism are respectively arranged in the grooves. Each extruding mechanism comprises four extruding forks uniformly arranged on the periphery of the glue cylinder, one end of each extruding fork is in contact with the glue cylinder, the other end of the extruding fork extends out a side hole of the upper central pipe or the lower central pipe, and the extending-out part is sleeved by a spring. The tail part of the extending out par of each extruding fork is provided with a piston disk, a piston sleeve sleeves the outer part of the piston disk, the piston disk is connected with the piston sleeve in sliding sealing manner, and the end part of the piston sleeve is provided with a second high-pressure soft pipe joint. The jacket-type oil casing air tightness detection device and the detection method can effectively realize air tightness detection of a small-size oil casing, and the service lifetime of the glue cylinder is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of an airtightness detection device and a detection method for an outer casing type oil and casing pipe thread. Background technique [0002] my country's natural gas market is expanding rapidly, and underground gas storage is widely used. Underground gas storage has a large storage capacity, a wide range of pressure adjustment, and low cost. However, compared with conventional production wells, injection-production wells have higher requirements for wellbore safety and integrity, and injection-production wells run longer. Due to the high operating pressure of the injection-production wells of the gas storage and the wide range of pressure changes, there is a large potential safety hazard for wellbore safety. [0003] Due to processing errors, bumps and micro-corrosion during transportation or operation, incorrect selection and use of sealing grease, unreasonable make-up torque, and cleanliness of couplings...

AI Technical Summary

Problems solved by technology

Since the currently used air tightness detection devices are all built-in, the outer diameter of the air tightness detection device needs to be reduced accordingly to match the pipe diameter of the oil casing. If the air tightness detection device is small in size It is still necessary to maintain the original structure and realize the original functions, which will greatly increase the difficulty of processing and manufacturing.

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