Concentric pipe heat tracing natural gas production method and special pipe string

Abstract

The invention discloses a concentric pipe heat tracing natural gas exploitation method and a special tubular column. The exploitation method comprises the steps as follows: a concentric pipe heat tracing gas injection and exploiting process tubular column is assembled and placed downwards, wherein the tubular column comprises an oil tubular column (1), an oil tubular column (2), a sleeve column (3), a linkage short joint (5), an underground throttle main body (6), an underground throttle nozzle (7) and the like; a gas exploitation well opening is mounted; a ground gas heating device is mounted; natural gas is heated and injected into a circular space between the oil tubular column (1) and the oil tubular column (2), and returns to the oil tubular column (1) via a high-temperature gas exhausting hole (4), natural gas produced from a stratum flows through the underground throttle to generate a negative pressure zone, the high-temperature natural gas heated on the ground is driven by negative pressure at the high-temperature gas exhausting hole (4) to easily flow into the oil tubular column (1) without external pressure, is mixed with the natural gas produced from the stratum, and then returns to the ground via the oil tubular column (1). The concentric pipe heat tracing natural gas exploitation method and the special tubular column are mainly used for solving the problem of liquid accumulation in the bottom of the well during gas well production.

Description

technical field [0001] The invention relates to a concentric tube heat tracing natural gas extraction method and a special tube column. Background technique [0002] Among the various processes of gas well development, whether the gas well development effect is good or bad directly affects the development benefits of the production unit, and is also directly related to the length of the stable production period and the recovery rate. Especially as the gas field enters the mid-to-late development period, contradictions such as formation pressure drop, production drop, and bottom hole fluid accumulation become prominent. At this time, the technology of gas well development has always played a decisive role in the benefit of gas field development. [0003] At present, the process technology of gas field development generally adopts the self-injection pipe string structure with choke installed downhole. The disadvantages of this technology are: (1) Once the bottomhole fluid acc...

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Problems solved by technology

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a concentric tube heating natural gas recovery method to solve the problem of frequent injection of nitrogen or low-density gas from the oil casing annulus once liquid accumulates at the bottom of the well during gas field production. The foam will discharge the bottom hole fluid, eliminating the need for fishing downhole choke operation procedures

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