Coalbed Methane Artificial Lift Challenges from Alberta's Mannville Coal

人工举升 煤层气 Lift(数据挖掘) 石油工程 工程类 往复泵 螺杆泵 往复运动 环境科学 煤矿开采 废物管理 机械工程 液压泵 气体压缩机 计算机科学 数据挖掘
作者
B. A. Johnson
出处
期刊:Canadian Unconventional Resources and International Petroleum Conference 被引量:2
标识
DOI:10.2118/138098-ms
摘要

Abstract In developing the Doris Mannville Coal Bed Methane (CBM) gas field near Fort Assiniboine, Alberta, the Nexen exploitation team encountered many unforeseen artificial lift challenges using Electric Submersible Pumps (ESPs). High failure rates and short pump run times made forecasting of production volumes and reserves difficult, while high operating costs driven primarily by downhole servicing reduced the economic viability of the project. The root cause of the high pump failure rate was attributed in most part to the unanticipated volume of produced coal fines and reservoir solids in the produced water stream. The production of these solids, coupled with lower than expected water production rates, led to a re-evaluation of the field's artificial lift strategy. Following a thorough artificial lift evaluation, a change from an ESP to a reciprocating rod pump (Pump Jack) system was initiated. The largest anticipated benefit of reciprocating rod pumping systems over ESP artificial lift systems were: Increased minimum flow path area through the system, reducing the frequency of solids plugging, leading to longer pump run times. Reduced well servicing costs with reciprocating rod pumps through elimination of services required solely by ESPs. Elimination of pump failures due strictly to electrical shortages by changing from an electrical/mechanical (ESP) to a straight mechanical (Pump Jack) downhole system. Improved operating efficiency by matching artificial lift design with actual water production rates. The change in artificial lift strategy made an immediate impact on pump failure rates in the Doris field. This paper will present the resulting increased pump run times, sustained production rates and drastically lower operating costs that has made reciprocating rod pumping systems the artificial lift method recommended by Nexen to exploit Alberta's Mannville coal for CBM.
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