Y tube self-balance type down-hole switch

Abstract

The invention discloses a Y tube self-balanced underground switch, which comprises an upper joint and a movable sleeve. A baffle is connected into the upper joint in a rotating way; a valve seat is arranged in the upper joint; the baffle is pressed on one end surface of the valve seat; the internal surface on the back end of the upper joint is provided with a groove; the front of a lower working barrel is connected into the upper joint on the back of the valve seat; the movable sleeve comprises a connecting sleeve and a guide head; a plurality of elastic claws are connected with the guide head; the external surfaces of the end part and the central part of each elastic claw are respectively provided with two bosses with different heights; the boss on the end part can be inserted into the concave groove on the lower part of the internal surface of the upper joint, both of which are combined with each other tightly. The Y tube self-balanced underground switch can perform inward and outward salvage, realize the press balance at the prophase of turning on, and realize the docking and sealing with the production tube column; the Y tube self-balanced underground switch realizes turn-on by force through the weight and the displacement of the production tube column and realizes automatic turn-off under the effect of the spring.

Description

technical field [0001] The invention relates to a matching technology of downhole leakage prevention technology used in oil wells with Y-shaped production strings for oil production operations, in particular to a Y-tube self-balancing downhole switch that can be opened and closed under specific working conditions. Background technique [0002] In order to solve the problem of formation pollution caused by the immersion of well washing fluid into the formation in oil wells that use Y-shaped production strings for oil production operations, to achieve the purpose of shortening the recovery time of production capacity, it is also a plugging agent for the passage of oil well test operation tool strings or plugging removal operations The injection provides a channel that can be opened under specific circumstances. At present, the following anti-pollution process devices are generally used in offshore oil fields: when the oil well is completed, a working cylinder with an anti-pollu...

AI Technical Summary

Problems solved by technology

Although this device can ensure that the well flushing fluid cannot leak into the formation, there are certain risks in the process of pulling out the plugs. It often happens that the anti-pollution plugs are stuck and cannot be salvaged. In addition, two wireline operations are required, and the operation cost higher

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