Wellhead repairing method for petroleum industry

Abstract

The invention relates to a wellhead repairing method for a petroleum industry. The technical scheme is as follows: the upper part of a transition connecting sleeve is connected with an upper pressingcap through a connecting bolt, a key sleeve is arranged below the upper pressing cap, the key sleeve is provided with an inner key slot, the inner key slot is matched with an outer key of a repairingport outer sleeve, the lower part of the repairing port outer sleeve is provided with a T-shaped groove, the bottom of a repairing port inner mold is of a conical structure, a plurality of gas injection holes are arranged, and the repairing port inner mold communicates with a one-way valve in an inner cavity of the repairing port inner mold through the gas injection holes. The wellhead repairing method for the petroleum industry has the beneficial effects that poisonous gas is effectively controlled through the cooperation of a full-sealed flashboard, the transition connecting sleeve, the keysleeve, the repairing port outer sleeve, the repairing port inner die and the upper pressing cap, leakage of a large amount of poisonous gas is avoided, self-injection or overflow is also avoided, thehole expanding repair of a linear notch is realized, the liquid outlet amount or the gas outlet amount is greatly improved, the problem in the current use of a continuous oil pipe is solved, and theapplication of the continuous oil pipe is further promoted.

Description

technical field [0001] The invention relates to a wellhead restoration device in the petroleum industry, in particular to a wellhead restoration method in the petroleum industry. Background technique [0002] With the continuous development of coiled tubing technology, the development and application of coiled tubing oil recovery or coalbed methane technology has been promoted. The existing coiled tubing has good flexibility. A roll of coiled tubing is several kilometers long and can replace conventional tubing for many operations. , The coiled tubing operation equipment has the characteristics of pressure operation, continuous lifting, small equipment size, fast operation cycle and low cost, and is especially suitable for the exploitation of self-flowing wells. Among them, the coiled tubing four-ram blowout preventer plays a pivotal role in coiled tubing operations and belongs to a special wellhead blowout preventer. The existing coiled tubing four-ram blowout preventer inc...

AI Technical Summary

Problems solved by technology

Although the above-mentioned invention improves the cutting tool, it still does not completely solve the problem of the incision, and still affects the fluid output of the coiled tubing, partially offsetting the advantages of large and stable fluid output of the coiled tubing

[0004] Therefore, for the four-ram blowout preventer with inline cuts that have been widely used in the oil field, this inline cut has seriously affected the liquid output or gas output of coiled tubing. There are some toxic gases in the pipeline, such as hydrogen sulfide, carbon monoxide, etc., and the energy of the formation is uncertain. Some oil and gas wells have high formation energy. Simply opening the four-ram blowout preventer to repair the cut may cause poisoning that is easy to operate However, it is easy to cause safety accidents such as blowout and overflow of high-pressure wells. Therefore, there is no special repair tool that can complete the repair work of the above-mentioned tubing cuts. Therefore, it is necessary to design a special repair device for straight cuts. Make a safe fix

Images