Hydraulic setting/unsetting high-pressure packer

Abstract

The invention relates to the technical field of downhole tools for petroleum and gas gas-lift wells, particularly a hydraulic setting / unsetting high-pressure packer which comprises a mandrel and, a rubber barrel seal assembly, a piston assembly, a slip assembly, an unsetting assembly and a lower joint, wherein the rubber barrel seal assembly, the piston assembly, the slip assembly, the unsetting assembly and the lower joint are sequentially sheathed on the outer wall of the mandrel from top to bottom in the axial direction of the mandrel; a piston of the piston assembly is connected with the upper end of a slip upper seat through an adaptation joint; the lower end of the slip assembly is connected with the upper end of the lower joint through a connecting outer barrel of the unsetting assembly; the upper end of the piston outer barrel is connected with a clamping ring; the piston outer barrel, an inner lock ratchet outer barrel and the upper end of a setting pin barrel are sequentially connected from top to bottom; the lower end surface of the setting pin barrel contacts the upper end surface of the adaptation joint; the unsetting seat slip sleeve is arranged between the mandrel and the lower joint; and an inner lock ratchet is arranged between the piston and the inner lock ratchet outer barrel. The packer has the advantages of reasonable structure, high pressure bearing level and low aftertreatment cost.

Description

Technical field: [0001] The invention relates to the technical field of downhole tools for oil and gas wells, in particular to a high-pressure packer for hydraulic setting and unsealing. Background technique: [0002] With the progress of petroleum exploration and development, the exploration is gradually carried out to deeper reservoirs. "In order to extract underground oil, the holes drilled in the formation according to a certain well structure are called "oil wells". "In oil wells, casings are generally lowered, and cement is injected between the outer wall of the casing and the well wall to maintain the well wall, seal the aquifer and isolate different oil layers. In order to ensure the smooth discharge of high-pressure fluid to the ground and the production safety of the oil well, the casing Oil pipes with high anti-extrusion grades are also lowered into the pipes.” Due to the increase in depth and reservoirs with high pressure systems at any time, the wellhead press...

AI Technical Summary

Problems solved by technology

Although oil pipes have been processed by various processes, considering the cost and drilling process, casings generally do not choose specially treated materials, and most of their extrusion resistance grades cannot meet the production requirements of high-pressure wells

Images