Concentric double-pipe gas well production pipe column

Abstract

The invention discloses a concentric double-pipe gas well production pipe column. The pipe column comprises a casing pipe, a small oil pipe hanger, a small oil pipe four-way joint, a large oil pipe hanger, an outer pipe column, a downhole safety valve, an inner pipe column, an annulus downhole safety valve, a double-pipe packer, a small-diameter oil pipe nipple, a small working barrel, a single-pipe packer and a large working barrel, wherein the outer pipe column is hung in the casing pipe through the large oil pipe hanger, the casing pipe is packed by the single-pipe packer, and the large working barrel is butt-jointed on the outer pipe column; the small oil pipe four-way joint is arranged on an original four-way joint at the top of the casing pipe, the inner pipe column is sleeved with the outer pipe column and hung on the small oil pipe four-way joint through the small oil pipe hanger, the outer pipe column is packed by the double-pipe packer, the small working barrel is butt-jointed on the inner pipe column, the small-diameter oil pipe nipple is fixed on the double-pipe packer, the annulus downhole safety valve is arranged at the upper end of the small-diameter oil pipe nipple, and the downhole safety valve is butt-jointed on the inner pipe column. The pipe column has the characteristics that the gas producing rate is high, well repair is not required in the later period, the operating cost is reduced, and the environmental pollution is low.

Description

technical field [0001] The invention relates to oil and gas exploitation equipment, in particular to a gas well production string. Background technique [0002] The State Intellectual Property Office published the publication number CN203452734U on February 26, 2014, and the patent name is a patent for a high-pressure gas well production and wax removal and prevention integrated pipe string. The utility model discloses a high-pressure gas well production and cleaning and prevention. The wax-integrated string structure includes setting a chemical agent injection valve on the oil pipe, which is a one-way valve; in addition, a capillary line is set in the annulus between the oil pipe and the casing, and one end of the capillary line is connected to the chemical agent injection valve. In the middle of the valve, the other end protrudes to the ground, which can meet the conditions of protective fluid and packer in the annulus of high-pressure gas wells, and achieve the purpose of...

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Problems solved by technology

[0003] The technical solution of the above-mentioned patent is obviously different from the technical solution of the present invention, and the problems to be solved are also different. Because the above-mentioned patent adopts the traditional single string Optimize the production string according to the production requirements, and the size of the string is only suitable for the production requirements when the production capacity is high in the initial stage of production

In the middle and later stages of gas well production, with the formation pressure drop, production layer pollution, water discharge and other problems, the original production string will not be able to meet the demand for liquid-carrying production, resulting in liquid accumulation or even water flooding and shutdown of gas wells

At this time, it is necessary to restore the normal production of the gas well by implementing drainage and gas recovery through workover operations. The workover operation of gas wells requires a large investment, high risk, and great difficulty. After the well, the expected goal cannot be achieved, which not only causes economic losses, but also causes environmental pollution.

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