Gas production system for water-gas well

Abstract

The invention discloses a gas production system for a water-gas well. The gas production system comprises a packer which is fixed in a sleeve and a fixed barrel, wherein a pre-storage cavity, a gas-water separator and a water tank are connected at the upper end of the sleeve in sequence; a spray nozzle comprises a spray nozzle inner core and a spray nozzle housing, a jet-flow hole is formed in the end part of the spray nozzle housing; an inner conical surface is arranged at one end of the spray nozzle inner core, a through hole, which directly faces the jet-flow hole, is formed in the other end of the spray nozzle inner core, a plurality of swirl vanes are mounted on the inner wall of the through hole, and a ring-shaped convection slot is formed in the middle of the spray nozzle inner core. When a gas-liquid two-phase mixture in the gas well is lifted under the pushing of well pressure, the gas-liquid mixture enters a gas inlet cavity and then is compressed in size through the inner conical surface, so that the flow velocity of the gas-liquid mixture is increased; when the gas-liquid mixture enters a swirl chamber, the fluid is in contact with the swirl vanes, the fluid is driven to rotate by the swirl vanes, and finally, the gas-liquid mixture is thrown out from the jet-flow hole through the centrifugal force generated by rotation.

Description

technical field [0001] The invention relates to the field of downhole gas production, in particular to a water gas well gas production system. Background technique [0002] In most gas wells in China, there will be water accumulation at the bottom of the well to varying degrees. For gas wells with bottom water or edge water, the liquid-gas ratio will gradually increase during the production process. If the liquid-gas ratio or bottom-hole liquid accumulation is not adjusted in time If the wellhead is not removed in time, it will lead to the normal production of the gas well, or even drown the gas well and cause production shutdown. Therefore, correctly predict the lifting capacity of the gas well at different levels of liquid content and choose the appropriate drainage and gas recovery process for the gas well according to the actual situation of the gas well. has important practical significance. [0003] At the beginning of a small amount of liquid accumulation at the bott...

AI Technical Summary

Problems solved by technology

In the prior art, a straight nozzle is usually used, and the liquid obtains greater kinetic energy after being pressurized. After passing through the nozzle, the liquid will be ejected at a high speed. Under the interaction of the surface tension, viscosity and air resistance of the liquid, the liquid will The dripping, smooth flow, and wavy flow gradually change to the spray flow, and finally realize the two-phase separation of gas and liquid; but because the water flow discharged from the direct injection nozzle has surface tension, it needs to continuously flow downhole during the process of the liquid turning into a spray flow. Only by pressurizing can the liquid be ejected at a high speed and rub against the surrounding air to separate and atomize, and the higher the downhole air pressure, the lower the safety and reliability faced during gas production, which can easily lead to safety accidents

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