Pressure Nozzles for Gas Reservoir Development

Abstract

The invention discloses a pressure nozzle for gas reservoir development, including a packer and a fixed cylinder fixed in the casing, a pre-storage cavity, a steam-water separator and a water pool are sequentially connected to the upper end of the casing, and a nozzle is threadedly connected to the fixed cylinder , the nozzle includes a nozzle core and a nozzle shell, the end of the nozzle shell is provided with a jet hole, one end of the nozzle core is provided with an inner conical surface, the other end of the nozzle core is opened with a through hole facing the jet hole, and the inner wall of the through hole A plurality of swirl vanes are installed on the top of the nozzle, and an annular convection groove is arranged in the middle of the nozzle inner core. When the gas-liquid two-phase mixture in the gas well starts to rise under the push of the pressure in the well, the gas-liquid mixture enters the inlet cavity and then compresses its volume through the inner conical surface. When the gas-liquid mixture enters the swirl cavity, the fluid It is in contact with the swirl blades, and the fluid is driven to rotate through the swirl blades, and the gas-liquid mixture is thrown out of the jet hole by the centrifugal force generated by the rotation.

Description

technical field [0001] The invention relates to the field of downhole gas production, in particular to a pressure nozzle for gas reservoir development. 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...

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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