Closed fishing wellhead device of injection well

• Main Authors: ZHANG XINGYAN, QIANG TIESHAN, YUAN QIANHUI, LU RUIQING, CUI XING, YANG LIGE
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to a closed salvage device used in well logging salvage, in particular to a closed salvage wellhead device for an injection well. The device comprises a wellhead sealing locking gate, a variable-diameter positioning fishing pup joint and a hydraulic well plugging pup joint, the wellhead sealing and locking gate comprises a main body, a sealing and clamping elastic gate plate and a gate hand wheel; the upper end part of the main body is connected with a blowout prevention pipe, and the lower end part is connected with a hydraulic shut-in pup joint; the variable-diameter positioning salvage pup joint comprises a weighting rod connector, a variable-diameter positioning pup joint and a salvage head; the weighting rod connector is connected with a reducing positioning pup joint; the reducing positioning pup joint is detachably connected with the fishing head; the hydraulic well plugging pup joint comprises a steel sleeve, a rubber sleeve, a pressurizing connector, a first piston, a second pis