Sliding tool for opening without pitching pressure control

Abstract

The invention discloses a downhole tool for achieving automatic opening and closing of a sliding sleeve by using liquid pressure and the tool is applied in the fields of petroleum development and the like. The technical scheme is as follows: an upper connector, an outer shell and a lower connector are connected through threads in sequence, the upper end of a central pipe is in threaded connection with the upper connector, the lower end of the central pipe is pressed tightly by the lower connector, a starting piston connector is located between the central pipe and the outer shell and connected with the central pipe through a positioning bolt, axial-direction positioning and circumference-direction positioning of the starting piston connector are achieved, a switch piston is located between the starting piston connector and a spring retainer ring and connected with the central pipe through a track pin A, positioning of the switch piston is achieved, a positioning spring achieves positioning through a spring clamping base and the spring retainer ring, the spring clamping base is located between the lower connector and the positioning spring, and axial-direction positioning of the spring clamping base is achieved through the lower connector. The tool can be used for well washing, water injection and fracturing in the oil drilling process.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a downhole device used for fracturing, water injection and well washing of oil and gas wells. Background technique [0002] In order to explore technical methods to increase the production of oil production wells and oilfield recovery, domestic and foreign oilfields have extensively tried and applied horizontal well production technology in various oil and gas reservoirs. Horizontal well production can contact a larger area of ​​oil and gas reservoirs. Compared with vertical wells, the drainage area is increased, which can improve the control degree of oil and gas reservoirs, thereby increasing the production of single wells. The production of horizontal wells is generally more than three times that of vertical wells. With the continuous development and improvement of horizontal well fracturing technology, the effective production of oil and gas reservoirs that are...

AI Technical Summary

Problems solved by technology

[0003] With the gradual development of horizontal well technology, the length of the horizontal section is gradually increasing. However, the traditional bridge plug perforation staged fracturing technology has many supporting equipment, complex processes, many consumables, and long time consumption. The size level limits the number of fracturing stages. Both techniques require grinding and milling after fracturing. They only have the function of one-time fracturing, and it is difficult to meet the requirements of the new fracturing process. Therefore, there is an urgent need for a simple process that can realize all-through New technology of diameter and infinite series fracturing

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