An intermittent gas well intelligent production technology is presented that use intelligent methods to determine and optimize the intermittent system of intermittent gas wells and use newly developed remote pressure-controlled well opening equipment that can simulate manual operations and corresponding intelligent control systems. This new approach is based on the research and application of intelligent technology in the production of intermittent gas wells. By establishing the models of gas flow in different types of gas wells, combined with the historical data of typical gas wells, the optimal pen and shut-in well time chart is finally formed. A series of remote pressure-controlled well opening equipment have been developed to replace manual pressure-controlled open well operations at the well site. Through intelligent integration of well site equipment and remote control platforms, an ntermittent gas well intelligent production management system is established. The quantitative determination of the intermittent system of different types of gas wells is realized. The effectiveness of gas well intermittent measures has increased from 72% to 90%. Electromagnetic remote-controlled open well equipment with adaptive decompression and full-open cylinder structure is developed, and can meet the requirements for rapid opening of type Il intermittent gas wells. Needle-valve type remote-controlled open well equipment embedded with intelligent well drilling algorithm is developed, and the fine well opening of class I and Il intermittent gas wells is realized. Hands-free operation is realized, and the workload of operating staff on the well site is reduced by more than 15%. On-site diagnosis of gas well production status, intelligent generation of systems, intelligent analysis and optimization are realized, and intermittent gas wells are transformed from manual management to intelligent management. An intermittent gas well intelligent production management system is established to achieve intelligent management of intermittent gas wells. Complete intermittent gas well intelligent production technology for low ermeability gas fields is described in detail to permit global similar gas field reference. The novelty of the technology lies in the use of intelligent methods to solve the production problems of intermittent gas wells, including reducing the labor intensity ofemployees, improving production efficiency, improving the fine management level of tight gas field gas wells, and reducing the impact of human activities on the natural environment.
Managing numerous gas stringers reasonably and effectively is an arduous work. A system of gas stringer automatic deliquification is presented that uses simulation of opening wells manually and automatic liquid loading identification as its basis for control logic. Technical effects of automatic deliquification in field test are compared to the operations of manual intermittent production and using foam. The new approaches are based on the research on the intermittency of the gas stringer. It considers the factors of tubing pressure, casing pressure, gas production rate, liquid producing, etc. Three algorithms are provided to reach a better effect of deliquification including operation of intermittency, operation of using foam, and operation of combination. Accordingly, reasonable intermittent rules can be set according to the characteristics of pressure and production rate. Simultaneously, fair concentration and amount can be determined as well. Furthermore, the mode of self-diagnosis of upper computer is described. Hardware and software for automatic opening well and automatic injecting foam are development, as well as remote control platform. The effects of using system of gas stringer automatic deliquification are compared to manual intermittent production and manual foam that have been traditionally applied. Four field case studies are presented. Field test in Sulige gas field shows that the average difference between tubing pressure and casing pressure decrease by 0.8MPa and gas production rate increase by 0.2×104m3/d. Meanwhile, the effects of liquid loading are reduced. The most significant effect is that automatic deliquification can make the operations timely and even finely. This is important because in some cases the proper rules are hard to execute for manpower. Besides, costs and labor intensity are reduced. The novelty of system of gas stringer automatic deliquification is in the ability to improve the accuracy and timeliness of operations. Through the research of gas stringer automatic deliquification, fine management of the gas well could be achieved, and the automation level of the gas field could be promoted. It will benefit tens of thousands of gas stringers in the world.
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