Hydraulic setting small diameter tubing bridge plug

Abstract

The invention discloses a hydraulic set-packer small-diameter oil pipe bridge plug, which is designed to meet the requirement of plugging of an oil pipe with a small-diameter underground tool. The hydraulic set-packer small-diameter oil pipe bridge plug comprises a mandrel, a connector, a cutting sleeve, a positioning supporting seat, a claw, an outer barrel, a locking ring outer barrel, a locking ring spring, a locking plate, a slip, a fixing spring, a slip lower seat, a rubber barrel seat, a rubber barrel jacket, a side rubber barrel, a central rubber barrel, a spacer ring and a nut, wherein the mandrel passes through the center of the entire bridge plug; the connector and the cutting sleeve are connected with a release sub; the positioning supporting seat is connected with the cutting sleeve; the claw is connected with the positioning supporting seat; the outer barrel is connected with a sealing end cover and a connecting sleeve; the locking ring outer barrel is connected with a shearing sleeve and a slip upper seat sleeve; the locking ring spring and the locking plate are arranged in the slip; the slip is sleeved on the mandrel; the nut is connected to the bottom end of the mandrel. A rigid body of the oil pipe bridge plug is small in outer diameter, the blocking range is large by adopting three rubber barrels, and the compression is high; positioning and anchoring are realized separately, so that the probability of blocking and clamping during descending can be lowered greatly; a hydraulic hole of the oil pipe bridge plug can be opened by using smaller ground acting force, so that the ground operation difficulty is lowered greatly.

Description

technical field [0001] The invention relates to a hydraulically set small-diameter oil pipe bridge plug, belonging to the technical field of pressure operation of high-pressure water injection wells in oil fields. Background technique [0002] Changqing Oilfield is a low-permeability reservoir, which is mainly developed by advanced water injection. The water injection pressure of water injection wells increases year by year, and the pressure of most wells is between 10 and 21 MPa. In order to ensure the effect of water injection, it is necessary to carry out periodic string inspection or workover operations on water injection wells. At present, the snubbing operation technology has been gradually promoted and applied in high-pressure water injection wells. However, due to the lack of corresponding downhole tools in the design of the early domestic water injection wells, the oil pipe bridge plug or plug must be put in before the snubbing operation starts. Then the wellhead ...

AI Technical Summary

Problems solved by technology

However, small-diameter downhole tools such as water distributors and packers are designed in the string of the layered water injection process. When conventional tubing bridge plugs or plugs are put in every time, they can only be blocked above the small-diameter downhole tools. The number of borehole tools determines the number of deployments, which greatly increases the construction cost and reduces the construction efficiency, which is not suitable for large-scale promotion and application

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