A kind of brine mining well casing maintenance device and method

Abstract

The invention provides a brine well casing pipe maintenance device, comprising a borehole, a casing pipe, an oil pipe and a casing pipe corrosion section, wherein the casing pipe is fixed in the borehole, and an upper packer and a lower packer are respectively arranged at the upper end and the lower end of the casing pipe corrosion section of the casing pipe; the oil pipe is positioned in the casing pipe, a hollow sucker rod is arranged in the oil pipe, an internal packer is arranged between the hollow sucker rod and the oil pipe, and the internal packer is positioned between the upper packer and the lower packer; annular spaces are respectively formed at the positions, where the oil pipe and the casing pipe corrosion section are arranged, of the casing pipe; a plurality of through holes are formed in the oil pipe at the casing pipe corrosion section. The brine well casing pipe maintenance device has the characteristics that the original size of the original borehole is ensured, so that the cyclic discharge capacity of the maintained casing pipe is constant, the casing pipe corrosion speed of a brine well is slowed down, the hidden danger caused by the reduction of borehole size is eliminated, and the aim of prolonging the production cycle of the brine well under the circumstances of conventional cyclic discharge capacity is achieved.

Description

technical field [0001] The invention relates to the technical field of brine mining well workover, in particular to a brine mining well casing maintenance device and method. Background technique [0002] Vertical well-horizontal well drilling group brine extraction is a new technology developed in recent years for underground brine, that is, one is a vertical well, the other is a horizontal well, the two wells are connected, and the two wells use brine circulation to dissolve and circulate the underground gypsum salt Take it out of the ground, separate the workshop, and continue the cycle. With the in-depth development of this technology, it has been gradually applied all over the country. Due to the nature of brine and the characteristics of the casing used, there are the following problems: [0003] The circulating brine has high solubility and takes a long time, which causes serious corrosion of the downhole casing. At present, the casing of the new well will be corroded...

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Problems solved by technology

[0004] In order to overcome the serious corrosion of existing downhole casings, resulting in smaller and smaller production boreholes, high pump pressure, low production, and affecting investment results, the present invention provides a casing maintenance device and method for brine production wells. The size of the wellbore is fixed, the circulation displacement remains unchanged after maintenance, the corrosion rate of the casing is reduced, the service life of the casing is extended and the hidden danger of the shrinkage of the wellbore size is eliminated, and the purpose of prolonging the production cycle of the brine production well under the condition of the conventional circulation displacement

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