Novel gas-liquid separate production pipe column for underground drainage gas production of sulfur-containing gas well

Abstract

The invention provides a novel gas-liquid separate production pipe column for underground drainage gas production of a sulfur-containing gas well. The novel gas-liquid separate production pipe column comprises a casing pipe, a canned electric submersible pump system arranged at the bottom of the casing pipe, a gas production oil pipe and a liquid discharge oil pipe, the gas production oil pipe and the liquid discharge oil pipe are vertically arranged in the casing pipe, underground safety valves are further mounted on the gas production oil pipe and the liquid discharge oil pipe, and the underground safety valves are connected with ground equipment through control pipelines; and the canned electric submersible pump system mainly comprises two electric submersible pumps, automatic reversing valves and a gas-liquid separator, wherein the automatic reversing valves are respectively matched with the two electric submersible pumps, and the two electric submersible pumps are connected with the ground equipment through cables. According to the novel gas-liquid separate production pipe column, corrosive fluid is not in contact with the casing pipe all the time, so that the concept of protecting the casing pipe for the sulfur-containing gas well is met; and in addition, the canned electric submersible pump system is used for achieving underground gas-liquid separate production, damage to the electric submersible pumps caused by gas-liquid simultaneous production is avoided, and the novel gas-liquid separate production pipe column is excellent in effect and has very high use benefits.

Description

Technical field [0001] The present invention relates to the field of oil and gas exploration wells Drainage technology, particularly relates to a method for liquid drainage gas downhole sour gas mining new partial string. Background technique [0002] In the mining process gas wells, gas wells when the flow rate is below the critical liquid carrying gas flow rate, gas well began effusion, gas well bore fluid will severely limit the productivity of gas wells, gas wells will lead to severe flooding discontinued. Gas drainage process is an effective way to solve the problem of gas well fluid. [0003] At present, a process for mainly liquid discharge gas well gas lift bubble discharge, the plunger lift and ESP, etc. Generally, these liquid discharge gas production process to meet the needs of the drainage wells under different conditions, but the special sour gas well structure, most of the process is not applicable to sour gas wells, especially large amount of liquid sour gas stron...

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Problems solved by technology

[0006] The key to realizing gas-liquid separation is how to establish a gas-liquid separation channel. The predecessors proposed a variety of gas-liquid separation string structures, such as: patent CN110593846A discloses a gas-liquid separation system for offshore gas well drainage and gas recovery Production string, this process string uses the oil casing annulus to drain liquid after separating gas and liquid downhole, which is contrary to the concept of casing protection in sour gas wells, and has great potential safety hazards, so this process string is not Applicable to sulfur-containing gas wells; patent CN104047588A proposes a downhole gas-liquid separation string suitable for pumping wells, but this process also does not consider the protection of casing; patents CN2758474Y and CN201763310U also propose downhole gas-liquid separation strings, but these strings are not suitable for sour gas wells due to the wellbore structure and lack of casing protection

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