Custom-pressure expandable naked eye packer

Abstract

The invention relates to a custom-pressure expandable naked eye packer applied to the technical field of fracture and acidulation oil and gas wells. The lower end of an upper joint is connected with a central tube; the lower end of the central tube is connected with a lower joint, a sealing mechanism is sleeved on the central tube; in the sealing mechanism, an upper connector and a lower connector are respectively vulcanized on the inner walls of both ends of a rubber tube; in a setting mechanism: an upper circular hook cap is sleeved on the outer wall of the lower end of the upper joint; thelower end of the upper circular hook cap is connected with the upper end of a hydraulic cylinder; a circular space between the hydraulic cylinder and the central tube is internally provided with a circular limit ring and a circular setting piston; the lower end of the hydraulic cylinder is connected with an overdraught cap and provided with a uniflow valve; in a decapsulating mechanism, the innerwall of the lower end of a pushing cap is sleeved on the central tube, and the lower end thread of the pushing cap is connected with a lower circular hook cap; and the inner wall of the lower circular hook cap is sleeved on the central tube and fixed with the central tube through a decapsulating pin. The invention has the advantages of meeting the modification requirements of the naked eye oil and gas well on monolayer fracturing and acidified delamination, preventing the rubber tube from expanding unlimitedly in the naked eye and taking the action of protecting the rubber tube.

Description

Technical field [0001] The invention relates to the technical field of fracturing and acidification of oil and gas wells, in particular to a special tool for open hole packing, which is a self-fixed pressure expansion open hole packer. Use tubing to run into the well, suitable for 152.4mm open hole packers. Background technique [0002] In the oil and gas stratification fracturing, the packer is one of the indispensable special tools downhole. Whether the packer can work normally under the high pressure and high temperature of the open hole oil and gas well is the key to ensuring the fracturing operation of the open hole oil and gas well. In the course of use, it was discovered that when performing layer fracturing on open-hole oil and gas wells, the expansion packers have the following problems to varying degrees: one is unreliable setting due to tubing pressure fluctuations; the other is that it is difficult to set the open hole due to irregularities. To achieve the purpose of...

AI Technical Summary

Problems solved by technology

During use, it was found that when fracturing layers in open-hole oil and gas wells, the expandable packers have the following problems to varying degrees: one is unreliable setting due to pressure fluctuations in tubing; The purpose of effective isolation is achieved; the third is that the pressure of the tubing is too high during the fracturing operation, and the packer rubber sleeve is damaged due to excessive expansion

Since there is no expansion restriction structure, when the liquid in the center tube keeps entering, the rubber tube will continue to expand and expand, which can burst the rubber tube and cause the seat seal to fail

Especially in the application of open hole with non-standard borehole diameter, it is easy to cause the rubber sleeve to burst and fail to seal

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