关键词: 高产水气井, 排水采气工艺, 自适应排采, 智能排采, 东胜气田

Abstract: The wellbore pressure loss of high-yield water gas wells is large. During the development process, as the pressure decreases, the liquid droplets in the wellbore fall back and aggregate to form a slug flow, resulting in further increase in wellbore pressure drop, increase in bottomhole flow pressure, decrease in production pressure difference, and decrease in gas production, ultimately leading to water flooding and production stoppage. Conventional processes such as bubble drainage and plunger are difficult to meet the long-term stable drainage needs of high-yield water gas wells. To this end, a high-yield water gas well adaptive intelligent drainage process has been designed and developed. Guided by the gas-liquid two-phase flow pattern diagram, the downhole gas-liquid separator and distributor are used to reasonably distribute the gas and liquid produced in the formation in the wellbore, always maintaining the wellbore gas and liquid flow velocity within the range of annular mist flow, in order to avoid the formation of slug flow due to liquid falling back and maintain stable drainage in the form of annular mist flow in the wellbore; Supporting design of anti freezing blocking system, gas-liquid management platform, etc., to ensure stable and efficient operation of the process; Simultaneously establish an intelligent control system to monitor the production status of gas wells in real time, dynamically optimize and adjust the gas and liquid production ratio. Selecting Q1 well in Dongsheng gas field as the experimental well for process application evaluation, the results showed that after the implementation of this process, the average daily gas production was 6 456 m ³, an increase of 15.9% compared to before implementation, and the daily liquid production was 2.64 m ³. The production time rate increased from 95.3% to 100%. The pressure monitoring showed that there was no liquid accumulation in the wellbore, and it operated continuously for 6 months, effectively replacing the foam drainage process and gas lift auxiliary drainage measures. Compared with the amount of foam drainage agent and gas lift frequency before the experiment, the cost investment was reduced by 507 200 yuan, fully verifying the effectiveness and economy of the adaptive intelligent drainage technology for gas wells. It solved the problems of short liquid accumulation cycle and difficult stable production in high water gas wells, and effectively released reservoir production capacity, intelligent control of gas wells, and long-term drainage and gas production throughout the entire life cycle. It is of great significance.

Key words: High-yield water and gas wells, Drainage and gas recovery technology, Adaptive drainage, Intelligent drainage, Dongsheng gas field