Fixed-point dragging continuous liquid drainage tubular column for fixed-point dragging of offshore low-pressure gas well and liquid drainage method of fixed-point dragging continuous liquid drainage tubular column

Abstract

The invention provides an offshore low-pressure gas well immovable string fixed-point dragging continuous liquid drainage string and a liquid drainage method thereof.A production oil pipe is arranged in a sleeve, a top packer is arranged between the inner wall of the tail end of the sleeve and the outer wall of the tail end of the production oil pipe, and a positioning seal is arranged on the production oil pipe above the top packer; a deep well safety valve and a circulating sliding sleeve are sequentially arranged on the portion, above the positioning seal, of the production oil pipe from bottom to top, a production packer is arranged between the inner wall of the casing pipe and the outer wall of the production oil pipe, an in-pipe packer is arranged in the production oil pipe, a continuous oil pipe is arranged in the production oil pipe, and the tail end of the continuous oil pipe penetrates through the in-pipe packer. A check valve is arranged at the tail end of the continuous oil pipe and located below the in-pipe packer, and a gas jet pump is arranged on the continuous oil pipe above the in-pipe packer. The liquid drainage pipe column has the technical advantages of being remarkable in liquid drainage effect, reliable in construction operation and the like in the aspect of low-pressure-coefficient horizontal gas well drainage.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, and more specifically relates to a non-moving pipe string of an offshore low-pressure gas well and a fixed-point dragging continuous liquid discharge pipe string and a liquid discharge method thereof. Background technique [0002] During the exploitation of offshore gas fields, when the gas production rate of the gas well is lower than the critical liquid-carrying flow rate, the gas well begins to accumulate liquid, and the liquid accumulation in the wellbore of the gas well will increase the back pressure on the gas layer, severely limiting the productivity of the gas well. Especially once the wellbore of a low-pressure gas well accumulates fluid, the amount of fluid accumulated in the wellbore will continue to increase, and in severe cases, it will cause the low-pressure gas well to be flooded and stop production. [0003] Commonly used drainage techniques for offshore gas wells ...

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Problems solved by technology

[0005] The present invention overcomes the deficiencies in the prior art, such as the insignificant drainage effect of gas wells with low pressure coefficient and horizontal accumulation of liquid in the sea, the high construction cost of the drainage and production string, and the technical problems that the drainage and production measures cause damage to the reservoir, and provides a new solution. An offshore low-pressure gas well fixed-point dragging continuous liquid drainage string and its liquid drainage method. The liquid drainage string has technical advantages such as remarkable liquid drainage effect and reliable construction operation in the drainage and production of low pressure coefficient horizontal gas wells.

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