Natural gas well supersonic nozzle atomization drainage gas recovery device and method

Abstract

The invention discloses a natural gas well supersonic nozzle atomization drainage gas recovery device and method. The device comprises a supersonic nozzle which is arranged on a shaft tube wall, wherein a supersonic nozzle reducing tube, a supersonic nozzle throat part and a supersonic nozzle diverging tube are arranged in the center of the supersonic nozzle from bottom to top in sequence; the supersonic nozzle is arranged on the shaft tube wall through a supersonic nozzle fixing and sealing device and is positioned on the liquid level at the bottom of a shaft. The supersonic nozzle can guarantee that natural gas in the shaft together with carried water reaches supersonic flow and the natural gas flow speed can reach 6 times of the sound speed. In the supersonic flow, the liquid is sheared and torn into extremely minor droplets; the droplets are uniformly mixed with the natural gas in an atomized manner to be discharged out of the shaft, and further the water can be continuously, stably and completely discharged by means of the energy of the natural gas. The problem of drainage gas recovery of a gas well is solved, and the device and the method have great economic value to natural gas production.

Description

【Technical field】 [0001] The invention belongs to the technical field of natural gas production, and in particular relates to a natural gas well supersonic nozzle atomization drainage gas recovery device and method. 【Background technique】 [0002] In the production of natural gas wells, produced water and condensate oil will be accompanied at the same time. As the production time continues, the bottomhole pressure of the gas well and the flow rate of natural gas will gradually decrease, resulting in the production of water or condensate in the gas reservoir. The natural gas flow is carried out of the wellbore, thereby becoming stagnant in the wellbore. These liquids accumulate at the bottom of the well for a period of time, forming a liquid column, causing additional hydrostatic back pressure on the gas reservoir, resulting in a continuous decline in the self-flowing energy of the gas well. Typically, if this continues, the accumulated fluid column in the wellbore will crus...

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Problems solved by technology

Generally speaking, there is no method that can achieve low drainage effect, poor economy and high investment cost for a long time.

For example, foam drainage requires regular injection of foam drainage agent to the bottom of the well, and regular production shutdown is required to discharge liquid that cannot be discharged by foam drainage. The cost of foam drainage agent and construction is also high

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