Gas well foam fluid drainage and gas recovery intelligent agent injecting system and agent injecting method

Abstract

The invention provides a gas well foam fluid drainage and gas recovery intelligent agent injecting system and agent injecting method. The agent injecting system comprises a foaming agent injecting channel, a first conveying channel, a separator, a defoaming agent injecting channel, a data acquisition device and a control device; the foaming agent injecting channel is connected to the lower portionof an annulus in a well; the first conveying channel is used for conveying out fluid from the well bottom; an inlet of the separator is connected with the first conveying channel, and an outlet of the separator is provided with a gas recovery channel and a fluid recovery channel; the defoaming agent injecting channel is connected with the inlet of the separator; the data acquisition device is used for acquiring fluid pressure in the foaming agent injecting channel, an oil pipe and a casing and parameter data of the defoaming agent injecting channel, the gas recovery channel and the fluid recovery channel; and the control device is used for receiving the data sent by the data acquisition device and adjusting the gas recovery amount per unit time by adjusting and controlling the agent injecting amount of the foaming agent injecting channel and the defoaming agent injecting channel in time. According to the agent injecting system, agent injecting is self-adaptively and directly adjustedaccording to changes of the gas production amount, and the gas well yield is increased.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and in particular relates to an intelligent injection system and an injection method for gas well foam liquid drainage and gas recovery. Background technique [0002] When natural gas wells are exploited in the middle and later stages, liquid accumulation at the bottom of the well will occur due to insufficient liquid carrying capacity, resulting in water flooding and shutdown of gas wells. Foam liquid drainage gas recovery technology is an effective means to remove liquid accumulation in gas wells and maintain stable production of gas wells, and it is the most widely used in various liquid drainage gas recovery processes. [0003] In recent years, with the implementation of digital gas fields, the foam drainage gas production and filling process is developing in the direction of automation and intelligence, and four types of automatic injection methods have been fo...

AI Technical Summary

Problems solved by technology

[0005] (1) The oil jacket pressure difference can only reflect the liquid level difference between the oil pipe and the annular space, but cannot truly reflect the amount of liquid accumulation, and is easily affected by the connectivity of the oil pipe and casing, so the oil jacket pressure difference is used as the filling The reliability of the basis is questionable

[0006] (2) In different production stages, the sensitivity of gas production to the influence of effusion is different, and the oil jacket pressure difference threshold corresponding to the timing of filling is different, and it still needs to be manually adjusted regularly based on experience

[0007] (3) Generally, only the improvement of foaming agent filling is considered, while the improvement of defoaming agent filling is ignored

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