Applying Statistical Process Control (SPC) To Automated POC Systems Data

A recently developed SPC program from Nalco/ Exxon Energy Chemicals, L.P. can significantly increase control of rod pumped wells. The program is applicable to automated pump off control(POC) systems where the controllers communicate with a common host. The program was derived from a need by Amoco to more effectively monitor paraffin deposition on tubulars in deep commingled wells. These wells experienced severe paraffin deposition resulting in costly well repairs. While the treatment method was important, the lack of an effective monitoring tool was critical. Amoco wanted a predictive monitoring tool that would warn them of paraffin in build up before it became a serious problem. Proactive monitoring of this type is one way to add value to automated monitoring systems. We learned that how well a rod pumped well is performing is a function of the data available from the POC and that applying SPC to this data will result in tighter control and improved operating efficiency.