Automatic water control device for gas well

Abstract

The invention discloses an automatic water control device for a gas well. The automatic water control device is mainly composed of a valve body, a valve body cover, a valve element and a lever closingdevice. The lever closing device comprises a lever, an L-shaped lever supporting frame, a lever supporting rotating shaft, a blocking block and a floating ball. The automatic water control device isdesigned based on the gas water physical property difference and mechanics theory, the device is provided with a moving member, the flow limiting and closing functions are achieved in time according to the change situation of the water and gas ratio in the automatic water control device, the gas generating profile can be balanced, bottom water ridge entering is delayed, the life of the gas well isprolonged, and the gas production rate and a recovery rate are increased.

Description

technical field [0001] The invention relates to the technical field of water control tools for oil and gas field development. More specifically, the present invention relates to gas-water physical property differences and mechanical theories, which can be used to balance gas production profiles, delay bottom water ridge advance, prolong the life of gas wells, and increase gas production and recovery. Background technique [0002] Compared with vertical wells, horizontal wells have the advantages of high gas production index, small production pressure difference and long water-free gas production period. Wells with complex structures such as horizontal wells have become the most important way to develop gas reservoirs, especially unconventional gas reservoirs. Hirai also exposed some problems. [0003] Due to the large contact area between the horizontal well and the underground fluid, the probability of drilling into the water layer also increases, and the bottom water ridg...

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Problems solved by technology

[0003] Due to the large contact area between the horizontal well and the underground fluid, the probability of drilling into the water layer also increases, and the bottom water ridge advance shortens the water-free gas production period of the gas reservoir, which will lead to the emergence of water gas after the horizontal well is put into production for a period of time. Ratio rises rapidly and even some gas wells are forced to shut down due to severe water production, seriously affecting gas well production and gas field recovery

A lot of research has been done on water control methods for water-producing oil wells and gas wells, but due to the complex flow state of gas-water two-phase in the wellbore, there is no mature water-control tool design for water-producing gas wells like oil wells. and research

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