Isolated gas lift drainage method

Abstract

The invention relates to an isolated gas lift drainage method. The isolated gas lift drainage method comprises the following steps: S1, a mounting pipe string is assembled, specifically, a first starting device, a punching gun (400), a second starting device and an isolated gas lift packer (100) are sequentially connected; S2, well lowering and punching are conducted, specifically, the mounting pipe string is lowered into the specified position from a production well pipe, and the first starting device controls the punching gun (400) to implement punching on the production well pipe; S3, upward lifting and setting are conducted, specifically, the mounting pipe string is upwards lifted, the isolated gas lift packer (100) is upwards moved to the punching position, and the second starting device controls the isolated gas lift packer (100) to conduct setting; S4, release and upward lifting are conducted, specifically, after setting, release is achieved, and the first starting device, the punching gun (400) and the second starting device are recovered to complete mounting; and S5, gas filling for liquid discharging is conducted, specifically, high-pressure gas is filled to discharge accumulated liquid. The mounting pipe string only needs to be lowered once, punching and setting are sequentially implemented, then the remaining mounting pipe string is lifted out, then mounting can becompleted, the process steps are simple, and mounting position control is more accurate.

Description

technical field [0001] The invention relates to the technical field of drainage and gas recovery technology, in particular to an isolated gas lift drainage method. Background technique [0002] In the process of oil and gas development, gas wells are usually used to exploit oil and gas in the underground production layer. However, when the gas well is developed to the middle and later stages, fluid accumulation is prone to occur in the wellbore of the gas well and the formation near the well bottom. When there is too much fluid accumulation or water production is too serious , the pressure of the effusion will offset the pressure of the gas well, which will hinder the exploitation of oil and gas. At this time, the gas well needs to be drained to restore the normal production of the gas well. [0003] The existing drainage gas recovery technology is divided into mechanical technology and physical and chemical technology, and the mechanical technology includes pipe column drai...

AI Technical Summary

Problems solved by technology

There are two main problems in this installation process: firstly, multiple downhole operations are required, the process is complicated and the cost is high; secondly, every re-downhole operation will cause an error in the distance, which will affect the position of the isolated gas lift packer and the gas injection hole. precision, increasing the risk of installation failure

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