Downhole Gas Production String and Gas Production Method

For gas wells with low production and large water production, the effect of bubble drainage is not obvious. For horizontal wells, it can only alleviate the degree of liquid accumulation, but cannot completely discharge liquid; the velocity string is easy to form large slugs due to the small diameter of the pipe, whether the start-up fluid exists Risk, for horizontal wells, it is impossible to discharge fluid in the horizontal section, and the drainage effect in the later stage of drainage becomes worse

Gas lift drainage can only realize the lifting of fluid accumulation above the circulating sliding sleeve, and cannot realize fluid drainage in the horizontal section; for low-pressure and low-production gas wells, hydraulic jet pumps and gas acceleration pumps use external energy drainage methods, and supporting The equipment pumps high-pressure medium to carry liquid to the ground. Once the pump is stopped on the ground, the hydraulic jet pump does not have the self-excitation function due to the lack of power water source in the well, and the bottom of the well will accumulate liquid again; the self-excitation function of the gas acceleration pump is limited, and the gas Once the pumping of high-pressure gas is stopped after lifting, there is a risk of liquid accumulation at the bottom of the well. This is because the inner diameter of the tubing is much higher than the inner diameter of the velocity string, and the required critical liquid-carrying flow rate is high, and the powerful atomization effect of the pump has Therefore, the gas acceleration pump can only prolong the self-spraying period of gas wells with high gas-water ratio and low water production