Spraying structure for oil well mining and construction

Abstract

The invention discloses a spraying structure for oil well mining and construction. The spraying mechanism comprises a core body and a shell which is arranged on the core body in a sleeving mode, a spraying hole is formed in the end of the shell, an inner circular conical surface is arranged at one end of the core body, and a gas inlet cavity is formed in the inner walls of the inner circular conical surface and the shell. A through hole opposite to the spraying hole is formed in the other end of the core body, multiple swirl vanes are mounted on the inner wall of the through hole, and a swirlcavity is formed in the inner walls of the through hole and the core body. A nozzle is fixed to the air outlet end of a gas well, when a gas-liquid double-phase mixture in the gas well begins to riseunder pushing of pressure in the well, the gas-liquid mixture enters the gas inlet cavity, passes through the inner circular conical surface and is subjected to volume compression, and accordingly theflowing speed of the gas-liquid mixture is improved; when the gas-liquid mixture enters the swirl cavity, the fluid is mutually in contact with the swirl blades, the swirl blades drive the fluid to rotate, and finally the gas-liquid mixture is thrown out of the spraying hole by using centrifugal force generated by rotation.

Description

technical field [0001] The invention relates to the field of downhole gas production, in particular to a spray structure for oil well production. Background technique [0002] At the beginning of a small amount of liquid accumulation at the bottom of the gas well, the liquid in the wellbore can be taken out of the wellbore by the gas using its own upward force, and the gas well can still produce normally. The gas flow rate is called the liquid-carrying critical flow rate of the gas well; when the actual flow rate of the gas in the wellbore is lower than the critical flow rate, the gas flow cannot take the liquid in the well out of the wellhead by its own lifting force. 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 Th...

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

Images