Automatic balance pressure expansion and fishing integrated expansion pipe tool and its use method

Abstract

The invention discloses an automatic pressure-balancing expansion-catch integrated expandable tube tool and a use method thereof. The automatic pressure-balancing expansion-catch integrated expandable tube tool comprises an expandable tube and a bottom plug arranged on the bottom of the expandable tube, a slidable pull rod which runs through the expandable tube and the bottom plug is arranged in the expandable tube, the lower end of the bottom plug is connected with an oil drain device which comprises an oil drain device shell sleeved on the outside of the pull rod, the gap between the oil drain device shell and the pull rod is formed into an annular space, a sliding sleeve which can slide in the annular space is arranged in the annular space, a back nut which is radially raised outwards is fixed on the bottom of the pull rod, the oil drain device shell is radially provided with an oil drain outlet, the sliding sleeve is radially provided with an aligning slotted hole, and the back nut can abut against and drive the sliding sleeve to slide in the annular space, so that the aligning slotted hole can be aligned and communicate with the oil drain outlet. The invention has the advantages that: the occurrence of the pumping phenomenon in the process of catch is prevented, the difficulty of bottom plug catch is decreased, and the safety and reliability of on-site operation in oil fields are enhanced.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to an automatic pressure-balancing expansion-fishing integrated expansion pipe tool and a use method thereof. Background technique [0002] At present, during the long-term oil production process of an oil well in an oil field, the downhole tubing will be damaged and needs to be repaired. The downhole casing subsidy workover method is one of the commonly used workover methods. It uses expansion tubes for casing subsidy reinforcement during construction, and uses bottom plugs to seal the bottom of the expansion tubes. The bottom plugs are threaded to the expansion tubes. Drilling, well completion, oil production, workover and other operations. [0003] Although the existing subsidy tool for expansion and fishing integrated expansion pipe can realize the salvage of the expansion pipe and the bottom plug at one time, but after subsidizing the long section of casing, the bottom plug and...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing subsidy tools for expansion and fishing integrated expansion pipes have defects such as the difficulty of bottom plugging and fishing, and the return of liquid to the wellhead, which brings a lot of inconvenience to the production, maintenance, environmental protection and other operations of the wellhead.

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