Research and Application of Automatic Measurement and Control System for Intermittent Production Gas Wells

Abstract

AbstractThe number of low-yield and low-efficiency gas wells in Xushen Gasfield of Daqing Oilfield increased year by year, among which the wells that cannot be continuously opened for production due to low pressure account for 15.9% of the total wells in production. At present, this kind of gas wells are operated by using manual experience to control intermittent production. However, due to the lack of reasonable intermittent system for guidance and untimely well opening and shut-in, the productivity of such wells cannot be effectively developed. In order to solve the problems, a quantitative optimization model for the intermittent production system was established, which can determine the reasonable timing of opening and shut-in from the gas well dynamic and static data, and a wellhead automatic measurement and control system was developed, according to the real-time monitoring of wellhead tubing pressure and casing pressure, which can automatically control the action of the compound valve at the wellhead according to the optimized intermittent production system, so as to realize the well opening and shut-in and the precise adjustment of the flow rate, achieving the purpose of automatic intermittent production. Field tests were carried out in 4 wells in Xushen Gasfield. The results showed that the automatic intermittent production measurement and control system was stable and reliable, with an average daily gas increase of 0.31 × 104 m3, a gas increase rate of 38.7%, and a reduction of manual maintenance workload by 80%. The successful development of this technology is of great significance for realizing high-efficiency and automatic production of low-pressure and low-production gas wells.KeywordsIntermittent productionWell opening and shut-inProduction systemAutomatic measurement and control systemOptimization model