Expansion open hole packer

Abstract

Expansion open hole packer, including expansion rubber sleeve, central tube, rubber sleeve connecting sleeve, block, locking sleeve, bridge connecting sleeve, setting and starting sliding sleeve, closing and locking sliding sleeve, lower joint. The upper and lower ends of the expansion rubber tube are threadedly connected to the central tube and the rubber tube connecting sleeve respectively, and the rubber tube connecting sleeve is locked on the central tube by the block in the lower groove. The upper and lower ends of the locking sleeve are respectively locked by an upper lock spring and a middle lock spring. The bridge connecting sleeve is threadedly connected with the center pipe, and is positioned with the rubber cartridge setting pin. The setting and starting sliding sleeve is installed in the inner cavity of the bridge connecting sleeve, and is connected and fixed by the setting and starting pin. The lower joint is threadedly connected with the bridge-type connecting sleeve, and the closing and locking sliding sleeve is set in the ring cavity formed by the bridge-type connecting sleeve and the lower joint, and is connected and fixed by a closing pin, and is unidirectionally locked with the lower locking spring. The invention improves the ability of the expansion rubber cylinder to resist high temperature and high pressure difference under the condition of non-standard internal diameter of the open hole; after the setting is completed, the setting fluid is guaranteed not to leak, and the sealing is reliable.

Description

technical field [0001] The invention relates to an oil and gas field downhole tool, in particular to an expandable open hole packer. Background technique [0002] At present, the expandable open hole packer used at home and abroad is composed of a central tube, an expansion rubber tube, a locking valve, a check valve, and a pressure limiting valve. Its working principle: When the expandable open hole packer is working, it is connected with tubing (casing) and lowered into the open hole. After running into the predetermined position in the well, inject liquid into the tubing and pressurize it. When the pressure reaches the predetermined value, the pin will be cut off, and the liquid will pass through the locking valve, check valve, pressure limiting valve, central tube of the expandable open hole packer and expansion glue. The gap of the rubber tube enters, expands the elastic rubber tube, and increases the diameter, so that the outer diameter of the rubber tube is closely a...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the non-standard size of open hole drilling, the inner diameter of the expandable open hole packer is required to reach 1.2 times the size of the drill bit. The existing expandable open hole packer can withstand high temperature when the diameter expansion rate reaches 20% for sealing the open hole section , The ability to resist high pressure is poor, and the rubber tube will burst when used

[0005] (2) The outer diameter of the expandable open hole packer should be smaller than the size of the drill bit and not larger than the set value, and the inner diameter should not be smaller than the set value. The wall thickness of the expandable open hole packer is limited, resulting in the use of lock valves and single flow The design scheme of valve and pressure limiting valve cannot be realized

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