Pluggable oil-layer anti-leakage valve

Abstract

The invention relates to a pluggable oil-layer anti-leakage valve, mainly comprising an upper joint, an outer sleeve, a plate valve and a lower joint and the like. The pluggable oil-layer anti-leakage valve is characterized in that the upper joint is internally provided with a guide head and an elastic claw seat connected with the guide head; the elastic claw seat is in threaded connection with a switch sleeve; a locking claw is connected with the switch sleeve; a locking ring is sheathed on the excircle at one end of the locking claw; the circumference of the outer sleeve is provided with pressure balance holes which have the same quantity with pressure balance holes of the switch sleeve; at least four sealing rings are arranged between the switch sleeve and the outer sleeve; a valve seat is connected in the lower joint under the switch sleeve, and is provided with a valve plate by a pin shaft; and the pin shaft is provided with a return spring. The pluggable oil-layer anti-leakage valve has the advantages that the leakage of completion fluid is reduced, the pollution of an oil layer is prevented, the operating procedure is simplified, the operating time is saved, the operating efficiency is improved and the operating cost is reduced; the anti-leakage valve is designed to be large diameter, so that the conventional pipe column can pass freely; and the plate valve can be opened repeatedly for multiple times by a special tool, and is made of drillable materials, so that when the plate valve can not be opened by the special tool, the valve plate can be fast drilled by a drill bit.

Description

technical field [0001] The invention belongs to the technical field of oilfield well completion, in particular to an insertable oil formation anti-leakage valve. Background technique [0002] In the currently known drilling and completion operations, oilfield production mostly adopts open production and completion systems. In conventional sand control completion operations, in order to balance the formation pore pressure and prevent overflow, the completion fluid must be continuously poured into the wellbore. The completion fluid leaked into the reservoir will not only pollute the reservoir, but also increase the Completion costs. In addition, if the completion fluid is not injected in time, it may lead to overflow or even blowout accidents. The existing anti-leakage valves used to seal off oil wells mainly adopt ball valve structure. During production operations, special tools are required to open the oil field to produce; during post-operation, special tools are required...

AI Technical Summary

Problems solved by technology

In conventional sand control completion operations, in order to balance formation pore pressure and prevent overflow, completion fluid must be continuously poured into the wellbore. The completion fluid leaked into the reservoir will not only pollute the reservoir, but also increase the Completion cost

In addition, if the completion fluid injection is not timely, it may lead to overflow or even blowout accidents

The existing anti-leakage valves used to seal off oil wells mainly adopt ball valve structure. During production operations, special tools are required to open the oil field to produce; during later operations, special tools are required to open. Due to the small diameter of the ball valve, it may be used in later operations. When the ball valve cannot be opened with a special tool, it is necessary to use a drill to drill out the ball valve, but because the ball valve is a solid structure, it will increase the difficulty of the operation

At present, the valve seat of the anti-leakage valve in the international closed production and completion system is connected with the lower joint by pins. During operation, the valve seat can only be destroyed. After cutting the pins, the valve plate and the valve seat are driven into the bottom of the well together. It is limited to one-time use, and the quotation is high, the delivery period is long, and maintenance is difficult, which greatly increases the development cost of the oil field

Images