Stepping type cup packer capable of achieving dragging under pressure and using method

Abstract

The invention discloses a stepping type cup packer capable of achieving dragging under pressure and a using method. The packer comprises a main shaft and a core shaft arranged in the main shaft, a cupseat and a cup directly vulcanized to the cup seat are arranged on the outer diameter of the main shaft, and the rear portion of the cup seat is connected with a pressure relief short section. The rear portion of the pressure relief short section is provided with a seal seat and a rest spring, a sliding sleeve constituting a matching pair with the pressure relief short section is arranged on theouter sides of the seal seat and the reset spring and connected with an elastic claw, and a pressing sleeve connected with the main shaft is mounted on the outer side of the elastic claw. Pressure conducting holes capable of conducting the pressure into the pressing sleeve are formed in the core shaft and the main shaft correspondingly. The using method of the stepping type cup packer has the advantages that the cup can be subjected to coupling through a sleeve pipe under the pressure balance state, the abrasion probability of the cup at the coupling position is effectively reduced, and the sliding sleeve moves downwards to automatically recover to the state that the sliding sleeve and the pressure relief short section are sealed after the cup is subjected to coupling through the sleeve pipe; and through stepping type matching using of the two sets of cup packers, the operation requirement of on-site annulus bearing can be met, an oil sleeve annulus is effectively packed, and the operation danger and the construction cost are reduced.

Description

Technical field [0001] The present invention relates to the technical field of oilfield development and production, and more specifically, the present invention relates to a pressure-dragable stepping cup packer used in the process of oilfield development operations and a method of use. Background technique [0002] With the development of the offshore oil industry, operating timeliness, operating costs, and operating safety have increasingly become the key to operations. In the process of completion and workover operations, as a basic operation step, the scraping and sand washing operation is the key to ensure the normal progress of the subsequent operation steps. If proper pipe scraping and sand flushing technology and tools can be adopted, not only can the quality of operation be improved, the occurrence of complicated situations in subsequent operations and even the occurrence of downhole accidents can be avoided, and the operation efficiency of the entire completion and work...

AI Technical Summary

Problems solved by technology

[0005] (1) During the process of going downhole under pressure, the outer edge of the cup slides close to the inner wall of the casing, and it is easily damaged if the well wall is damaged or burrs

[0006] (2) If it passes through the casing coupling during the descent, it is easy to damage the cup, resulting in poor sealing and affecting the operation effect

[0007] (3) During the lifting and lowering process of the pipe string, because the leather cup is close to the casing, the frictional resistance is relatively large, which increases the operation risk

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