Hydraulic control cycling switch

Abstract

A hydraulic control cycling switch is formed by an upper joint, an upper guiding body, a rubber sheet, a connecting body, a fixing ring, a nut for the fixing ring, track pins, springs, a lower guiding body and a lower joint. The fixing ring is firstly sleeved on the connecting body, so that spring holes on two parts correspond to each other; the springs are imbedded in the spring holes, and the track pins are arranged; the nut for the fixing ring is connected onto the fixing ring through screw threads; the lower guiding body is connected onto the connecting body through screw threads; the rubber sheet is sleeved on an outer cylindrical surface of the upper guiding body; and the upper guiding body and the connecting body are in thread connection. A group of symmetrical track slots connected with inner holes is arranged on an outer cylindrical surface of the upper end of the lower joint; the assembling units are imbedded into the inner holes of the lower joint; the track pins are hung on top dead centers of the track slots of the lower joint; and the whole part is connected and tightened with the upper joint through lower joint oil pipe threads. When being descent into a well, a tool is at an 'off' state, and when a channel of the oil well needs to be opened, an internal assembly of the tool is taken out through a hydraulic way, so that the channel is at an 'on' state.

Description

technical field [0001] The invention belongs to the field of manufacturing downhole tools used in oil exploitation, and in particular relates to a hydraulic control cycle switch. Background technique [0002] With the continuous extraction of crude oil in the oil well, the formation pressure of the oil layer continues to decrease, and the porosity of the oil layer near the oil well continues to increase. Therefore, in the well cleaning work of the workover operation, a large amount of well cleaning fluid often leaks into the oil layer. , known as well leakage in engineering. Lost circulation not only causes a lot of waste of well cleaning fluid, but also seriously pollutes the oil reservoir, reducing the fluid production of the oil well. , Oil wells that cannot spontaneously blow out originally will suddenly blow out during workover operations, often causing heavy losses in people, property and materials. Sometimes the formation pressure is slightly higher than the bottom ...

AI Technical Summary

Problems solved by technology

Lost circulation not only causes a lot of waste of well cleaning fluid, but also seriously pollutes the oil reservoir, reducing the fluid production of the oil well. , Oil wells that cannot blow out spontaneously will suddenly blow out during workover operations, often causing heavy losses in human, property and material

Sometimes the formation pressure is slightly higher than the bottom hole pressure, although blowout will not occur, but the crude oil gushing out of the wellhead will bring a lot of trouble to the workover operation

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