|Publisher||Society of Petroleum Engineers|
|Content Type||Conference Paper|
|Title||Successful Application of Integrated Digital Automation System for Production Optimization in North San Juan Basin|
Peter O. Oyewole, Michael D. Scull, and Mark S. Downey, BP and John B. Herring, Pure Automation Inc.
Digital Energy Conference and Exhibition, 11-12 April 2007, Houston, Texas, U.S.A.
2007. Society of Petroleum Engineers
|5.1.4 Monitoring and Control
Gas production increment of over 4MMcfd has been achieved and sustained in less than 40 plunger lift installations mainly due to availability of high quality digital automatic control system coupled with effective utilization of plunger lift data. By itself, the system adjusts plunger arrival time, after flow and shut-in time based on pre-set operating range to maximize gas production. Thirty tubing flow control installations have resulted in an average gas production uplift of 130Mcfd per well. In tubing flow control application, the casing valve is automatically controlled based on well conditions. This allows a well to flow gas through tubing above critical gas rate while releasing friction and backpressure on the formation by producing additional gas through the tubing-casing annulus. It is a simple process that includes a combination of surface equipment and control logic that could not perform faultlessly without intelligent automation system.
This is a significant departure from the traditional means of operating gas wells where highly expensive full rig intervention is required to continuously optimize tubing size and artificial lift installation. As expected, improved business performance has been achieved through an intelligent integrated digital automation system.
Unlike conventional natural gas reservoirs in which gas production rates tend to be greatest at the onset, then steadily decline over the life of the well, coal bed methane produced in North San Juan progressively increases in gas production rate to a maximum flow rate years or several days after the first production. It has always been a great challenge to match and optimize tubing and well bore conduit with the ever changing production rate. Application of optimized Tubing-Flow Control is helping to mitigate these challenges.
|File Size||465 KB|