Device and method of low temperature separation dehydration of gas field well mouth

Abstract

The invention discloses a device and a method of low temperature separation dehydration of a gas field well mouth. Three processes including depressurization, gas-liquid separation and dehydration are integrated, steam in natural gas is condensed into water mist or aquo-complex condensation nucleus by utilizing low temperature cold quantity produced by throttling; high speed gas flow after throttling is sent to a whirlcone of a low temperature separation device; and small water drops and the aquo-complex condensation nucleus in the water mist rotate in the whirlcone at a high speed and are thrown to an inner wall of a casing of the whirlcone under effect of centrifugal force to achieve gas-liquid separation. Compared with a method that the natural gas is overall heated before throttling by using a heating method or an inhibitor is added to block generation of the aquo-complex, the device of low temperature separation dehydration of the gas field well mouth has three functions of throttling, separation and dehydration; and with the adoption of the device, a dehydration device is removed and investment and administration expenses are greatly reduced.

Description

technical field [0001] The invention belongs to the field of natural gas gathering and transportation, and in particular relates to a gas field wellhead low-temperature separation and dehydration device and method. Background technique [0002] The pressure of the natural gas at the wellhead is generally higher than the gathering pressure. During the production process of the natural gas at the wellhead, a throttle valve is used to adjust the pressure to reduce the high-pressure gas flow to the gathering pressure. Due to the decrease in pressure, gas expansion leads to a decrease in gas temperature. If the temperature drop reaches or exceeds the hydrate formation temperature after throttling, hydrates will be generated in the gas after throttling, causing pipelines, valves, and instruments to be blocked, reducing pipeline production. capacity, in severe cases, it may lead to pipeline damage or stop production. [0003] The following two methods are generally used to prevent...

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Problems solved by technology

[0005] In order to ensure the normal production of natural gas at the wellhead and prevent the production of hydrates after high pressure throttling, the two technological measures adopted, namely the heating method and the inhibitor injection method, not only the energy generated by the throttling is not used, but also there are process devices Complexity, energy consumption and other issues, it is necessary to find a new more environmentally friendly and energy-saving process device and method

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