Branching well seat suspension liner tube hydraulic booster expansion system

Abstract

The invention relates to a seat suspension liner pipe hydraulic boosting expansion system for a branch well. The system is characterized in that the system comprises a sleeve, a liner pipe, an hole enlargement bit, a hydraulic cylinder, a piston rod, a boosting piston and a drill rod; the hole enlargement bit is arranged inside the liner pipe, and the bottom of the liner pipe is arranged inside the sleeve; the top and the bottom of the hydraulic cylinder are sealed respectively, and the bottom of the hydraulic cylinder is hermetically connected with the top of the liner pipe through a bolt pin; the piston rod is a hollow rod, and the bottom of the piston rod passes through the bottom of the hole enlargement bit and is fixed on the bottom of the hole enlargement bit; the top of the piston rod passes through the top of the boosting piston and is connected with the drill rod; the boosting piston is provided with a liquid outlet hole communicated with the center of the piston rod. The system has a simple structure and convenient execution, can not only improve the thrust effect, but also remove the potential safety hazard caused by hypertension. The system can be widely used in the operating process of various branch well seat suspension systems.

Description

technical field [0001] The invention relates to a hydraulic device, in particular to a hydraulic power-assisted expansion system for hanging a liner on a branch well seat. Background technique [0002] During the development of Bohai oilfields, adjustment wells need to be drilled in some old oilfields in the later stage to achieve the purpose of stabilizing production, increasing oil and controlling water. Usually, when sidetracking in old wells, a skewer device with an anchoring and sealing mechanism with slips is often used in the wellbore of the casing, which often causes damage to the casing, and at the same time due to running After the skewer, it is difficult to communicate with the old wellbore. Therefore, after sidetracking, we can only get the new wellbore sidetracked and it is difficult to reuse the old wellbore. In order to maximize the production potential of the oilfield, we often hope to retain and utilize the original old wellbore while sidetracking the old w...

AI Technical Summary

Problems solved by technology

[0004] When using the above-mentioned radial pipe expansion technology for operation, the thrust of the hydraulic device on the bottom of the expansion cone is one of the key technologies. Using a relatively large thrust can improve work efficiency and obtain a better stress effect on the liner, but it is relatively large. Large system pressure will form a high safety hazard in the production process

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