Electric pump well temporary plugging and drainage integrated self-lifting casing and fishing free device

Abstract

The invention relates to the technical field of downhole tools used for extracting oil from oil wells and in particular relates to an electric pump well temporary plugging and drainage integrated self-lifting casing and fishing free device. After the integrated device is used, the pipe string pressure test can be completed in the descending process, after a well is completed in place, an electric pump is started for test production after a cable-through packer is set via positive pressure, and a setting valve stem assembly can be taken out from a Christmas tree paraffin valve via the lifting force generated by the electric pump, thus rapidly completing preparation before production. If positive and reverse well washing is needed in the production process, the setting valve stem assembly only needs to be put in from the paraffin valve to undergo positive pressure. The electric pump well temporary plugging and drainage integrated self-lifting casing and fishing free device comprises the setting valve stem assembly, wherein the upper part of the setting valve stem assembly is connected with a fishing head by a fixed pin; the lower part of the setting valve stem assembly is connected with the interior of a valve main body by a seal insertion pipe in a sliding manner; drainage holes are distributed in the setting valve stem assembly; an upper cup and a lower cup, which are oppositely arranged, are arranged in the middle of the setting valve stem assembly in a sleeving manner.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oil well production, in particular to an integrated self-lifting and fishing-free device for temporarily blocking and discharging electric pump wells. Background technique [0002] The existing electric pump well completion and drainage technologies are mainly divided into the following two types: first, tools such as mechanical check valves, oil drains, hydraulic control sliding sleeves, downhole safety valves, and cable packers are inserted, During the downhole process, the check valve is used to test the pressure of the upper pipe string; but this kind of technology has the following defects: after the completion is run in place, the positive pressure setting of the cable packer will cause the completion pipe string to fail. For positive circulation well flushing, backwashing can only be realized by passing through the through hole of the exhaust valve of the cable packer and other c...

AI Technical Summary

Problems solved by technology

[0002] The existing electric pump well completion and drainage technologies are mainly divided into the following two types: first, tools such as mechanical check valves, oil drains, hydraulic control sliding sleeves, downhole safety valves, and cable packers are inserted, During the downhole process, the check valve is used to test the pressure of the upper pipe string; but this kind of technology has the following defects: after the completion is run in place, the positive pressure setting of the cable packer will cause the completion pipe string to fail. For positive circulation well flushing, backwashing can only be realized by passing through the through hole of the exhaust valve of the cable packer and other components or opening the hydraulic control sliding sleeve

However, this method will lead to the inability to test the pressure of the pipe string during the downhole process, and the construction time will be longer (2h), and the setting effect cannot be guaranteed

Although the positive flushing function can be realized, it is impossible to find leaks in the later stage of the pipe string pressure test. If the electric pump is stuck, the connection between the inside of the pipe and the outer annulus cannot be achieved, and the drill can only be ejected. Hidden dangers in production safety

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