Gas well downhole flow control system and control method

Abstract

The invention discloses a gas well downhole flow control system and control method, and belongs to the technical field of natural gas extraction. The control method comprises the steps that a first controller acquires target control instructions, the sequence of the target adjusted air pressure value is determined according to the corresponding relation between the control instructions and the sequence of the adjusted air pressure value, a pressure regulating valve is controlled according to the sequence of the target adjusted air pressure value, and a corresponding pressure value is generatedin a gas well pipe; the pressure value is detected by a downhole pressure sensor, and the pressure sensor then sends the pressure value to a second controller; when multiple continuous air pressure values received by the second controller are matched with the sequence of the target adjusted air pressure value in the sequence of the detected air pressure value, the target control instructions aredetermined and sent to downhole functional execution equipment such as a electronically controlled throttle valve; and the throttle valve adjusts the opening of the valve to increase or decrease the gas production rate in the gas well. According to the gas well downhole flow control system and control method, the communication effect between well pressure regulating equipment and downhole throttling equipment is good.

Description

technical field [0001] The present disclosure relates to the technical field of natural gas exploitation, in particular to a gas well downhole flow control system and control method. Background technique [0002] In the process of natural gas extraction, technicians need to control the downhole equipment, such as controlling the opening of the choke valve located in the well to control the downhole flow of the gas well, so as to achieve the purpose of smooth extraction. [0003] The communication methods between the uphole equipment and the downhole equipment are divided into wired communication and wireless communication. Among them, the wired communication means that the mining equipment located in the well is installed with cables for communication with the uphole equipment, but the depth of the gas well is many. For more than five kilometers, the cables used are long, and when the cables fail later, it is not easy to maintain. Most of the wireless communication methods ...

AI Technical Summary

Problems solved by technology

In the case of wireless communication using electromagnetic waves, sound waves, and vibration waves, since the depth of gas wells is mostly more than 5 kilometers, the distance between the above-hole equipment and the down-hole equipment is relatively long, and the attenuation and interference of signal waves are serious, resulting in the abnormality of the above-hole equipment and down-hole equipment. Communication, thus affecting the normal extraction of natural gas

Images