Hydraulic switch sliding bush

Abstract

The invention discloses a sliding sleeve for a hydraulic switch, which belongs to the manufacture technology field of underground tool for cementing operation in the oil and natural gas drilling engineering, and comprises a sliding sleeve structure for switch and a control structure. The sliding sleeve structure for switch comprises an upper joint, a piston sleeve, a switch sleeve, a central tube and a lower joint, wherein the piston sleeve is sleeved outside the upper joint, the switch sleeve is sleeved outside the central tube, and the lower joint is connected with the lower end of the central tube; the control structure comprises a connecting joint, a cylinder sleeve, a piston rod and a sealing plug, wherein the connecting joint is connected with the cylinder sleeve, the sealing plug is arranged on the lower end of the piston rod, and the control structure is arranged in the upper joint of the sliding sleeve structure for switch. The invention provides a sliding sleeve for hydraulic switch that can realize repetitious on/off actions through providing hydraulic force on the ground and setting different hydraulic cylinders on the sliding sleeve to realize the on-off mode of the sliding sleeve; the sliding sleeve for hydraulic switch can realize the switch-on or switch-off state of the sliding sleeve repetitiously and is characterized in simple structure, convenient operation and reliable performance.

Description

Technical field: [0001] A hydraulic switch sliding sleeve, which is used in oil and gas well cementing operations on the packer string and can be repeated multiple times to realize the construction operation of opening and closing the oil sleeve annulus, and belongs to the downhole tool manufacturing technology for cementing operations in oil and gas drilling engineering field. Background technique: [0002] In oil and gas well trial repair or stimulation reconstruction, in order to cooperate with the downhole packer string to carry out circulation, liquid replacement, well killing, squeeze injection and other operations, the sliding sleeve must be used to cooperate with the downhole packer string for construction operations, so the slippery The sleeve is an important supporting tool for the construction operation of the downhole packer string. When performing operations, the sliding sleeve is often required to perform multiple switching actions to complete all construction ...

AI Technical Summary

Problems solved by technology

[0002] In oil and gas well trial repair or stimulation reconstruction, in order to cooperate with the downhole packer string for circulation, liquid replacement, well killing, and squeeze injection, the sliding sleeve must be used to cooperate with the downhole packer string for construction operations, so the slippery The sleeve is an important supporting tool for the construction operation of the downhole packer string. In the implementation of the operation, it is often necessary for the sliding sleeve to realize multiple switching actions to complete all the construction operations; there are mainly two types of switch sliding sleeves currently used. , one is a one-time sliding sleeve, the disadvantage of this sliding sleeve is: in the field application, this hydraulic sliding sleeve only has the function of one-time opening or closing, and after the opening or closing operation is completed, it must be left underground. Due to the small inner diameter of the pipe string after operation, if the sealing effect is not good in the long-term production process, it often cannot meet the needs of oil testing and production logging; the other is the mechanical vibration sliding sleeve, which is Although this kind of sliding sleeve switch can realize multiple switching actions, it needs special construction equipment to complete the opening or closing operation, so each operation will increase the dependence on the operation equipment, and it requires a higher level of protection when shocking. Therefore, there is a high requirement for the technical quality of the operator, which cannot be completed by ordinary skilled workers, and there is also a high requirement for the quality of the liquid in the well. This method is difficult to achieve the purpose in the deep well below 3000 meters. of

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