Tubular column of casing damage well for continuous oil bailing and process method thereof

Abstract

The invention discloses a tubular column of a casing damage well for continuous oil bailing and a process method thereof. The method includes the steps of according to the size of a casing pipe of anoil bailing well and the positions of a static liquid surface and a casing damage point, determining an assembled structure of a combined tubular column; sequentially putting a drainage pipe, a sand-proof mechanism, a pump ball valve, a sealing device and an oil tube down to a well, sequentially connecting the drainage pipe, the sand-proof mechanism, the pump ball valve, the sealing device and theoil tube to form the combined tubular column with the assembly depth, and putting the combined tubular column down to a preset position; using the oil tube to press and set the sealing device, releasing the sealing device, and pulling out the detached tubular column; utilizing an oil bailing steel wire to put down an oil bailing weight and an oil bailing pump to a position the distance between which and the sealing device is larger than a preset distance; connecting the casing pipe to an oil storage tank through an oil bailing pipeline, lifting the oil bailing steel wire and monitoring the pressure in the casing pipe, and determining the lifting process of the oil bailing steel wire according to the pressure changes. The tubular column of the casing damage well for continuous oil bailingand the process method thereof can overcome defects in the prior art and achieve normal oil bailing of the casing damage well.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a casing damaged well continuous fishing string and a process method thereof. Background technique [0002] As oilfield development enters the middle and later stages, the management of oil wells becomes more and more difficult. High water cut wells, low fluid flow wells, long shut down wells, and wells with casing damage are increasing year by year, and the productivity loss of these oil wells is increasing year by year. According to statistics, it is found that the long shutdown of wells will result in a loss of about 30,000 tons of crude oil production capacity per year. At present, in the oil production site, the oil extraction method is generally adopted for the long-stop well, that is, the special oil extraction pump is lowered, the casing is used as the suction pump barrel, and the oil extraction steel wire is lifted on the ground by the oil extraction vehicl...

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Problems solved by technology

[0007] However, through statistical analysis: the proportion of wells caused by casing damage in long shutdown wells is 46%, and this part of oil wells loses an average of 13,000 tons of crude oil per year, and this part of production capacity cannot be recovered by conventional oil extraction, so how to solve casing damage wells The problem of oil extraction is imminent

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