Injection device capable of adapting to low-temperature environment in foam drainage gas recovery

Abstract

The invention discloses an injection device capable of adapting to a low-temperature environment in foam drainage gas recovery, which is applied to a water-bearing natural gas field and can overcome the difficulties of removing liquid accumulations of the well shaft in the gas well with accumulated liquids and removing foams in the produced fluids under the conditions of no commercial power supply and low ambient temperature. The technical scheme adopted in the invention is as follows: a liquid feeding pump is connected with ball valves through a pipe and then connected in parallel with a chemical tank I, a chemical tank II and an anti-freezing agent tank through the ball valves; heaters are arranged inside the chemical tanks; tail gas jackets are arranged at the periphery of the chemical tanks; a first quick-acting coupling is connected with a first cut-off valve and a first one-way valve through a pipe and then connected with a first electric contact pressure gauge, a first plunger pump and a first motor; the outlet end of the first plunger pump is connected with the ball valves respectively and then connected with the chemical tanks and the anti-freezing agent tank; a second quick-acting coupling is connected with a second cut-off valve and a second one-way valve through a pipe and then connected with a second electric contact pressure gauge, a second plunger pump and a second motor; the outlet end of the second plunger pump is connected with the chemical tanks; and an oil-fired generator and an electric control system form a circuit system. The injection device has compact structure, is convenient in transportation, is suitable for the actual environments in natural gas field production, and improves the drainage gas recovery effect.

Description

technical field [0001] The invention relates to a foam drainage gas recovery injection device suitable for low-temperature environment, which is used for foam drainage gas recovery in water-containing gas fields in the natural gas industry. technical background [0002] With the deepening of the development of water-bearing gas fields, the energy of the formation gradually decreases, and the pressure of the gas reservoir decreases continuously, which often leads to the formation water or condensate in the wellbore of the gas well not being carried out of the wellbore by the natural gas flow immediately, resulting in the phenomenon of wellbore fluid accumulation. Seriously affect the normal production of gas wells, and even flood the gas wells. Timely removal of fluid accumulation in the wellbore is particularly important for the normal production of gas wells. Foam drainage and gas recovery technology is one of the technologies widely used in large field drainage and gas rec...

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Problems solved by technology

[0004] The purpose of the present invention is: to solve the problem of liquid-loaded gas wells without industrial power supply and low ambient temperature, which cannot effectively use foam drainage and g...

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