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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Unconventional Miscible EOR Experience at Prudhoe Bay: A Project Summary
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Unconventional Miscible EOR Experience at Prudhoe Bay: A Project Summary

机译：普拉德霍湾非常规混溶EOR经验：项目摘要

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摘要

This paper summarizes the conceptual development, reservoirrnsimulation, and field testing of a new miscible EOR recoveryrntechnique at Prudhoe Bay. Two distinct variations of thisrntechnique have been evaluated.rnThe vertical Miscible Injectant Stimulation Treatment (MIST)rnprocess involves completing a production well at the bottomrnof a thick, continuous, watered-out interval. A large slug ofrnmiscible injectant (MI) is injected, followed by a small slug ofrnchase water. The MI sweeps rock not contacted by previousrnMI injection and drives EOR oil to offset producers. It alsorncreates a mobilized oil bank in the vicinity of the productionrnwell. The well can then be recompleted at the top of thernreservoir and returned to production service, or used for somernother purpose.rnIt is particularly advantageous to utilize this vertical drivernprocess in conjunction with horizontal wellbores. In the lateralrnMIST process, a horizontal lateral is drilled along the base ofrnthe reservoir from either a production or injection well. MI isrninjected sequentially into several intervals along the lateral tornmobilize EOR oil from previously unswept areas. The lateralrnwell is then returned to normal production or injection service.rnSimulation data indicate that the vertical MIST process couldrnrecover over 200 Mstb of incremental oil per well at initialrnrates of up to 1000 stb/D. Calculations for the lateral MISTrnprocess indicate potential recovery of more than a millionrnbarrels of incremental EOR per lateral.rnField results of the MIST process have been mixed, but overallrnare encouraging. Incremental EOR response from the firstrnMIST lateral well is currently about 1400 Mstb, resulting in arntechnical and economic success. Response from threernsubsequent MIST lateral injectors varied widely. The firstrnvertical well MIST showed little response, but it did providernvaluable insight into the performance of the process atrnPrudhoe Bay. The subsequent vertical well MIST, which had arnmuch larger volume of injected MI, was very successful andrnhas currently recovered over 600 Mstb. Cumulativernincremental EOR from the MIST wells through July, 2000, isrnover 5000 Mstb, with average incremental oil production ratesrnover the past four years of about 4000 stb/D.
机译：本文总结了Prudhoe湾的一种新的可混溶EOR采油技术的概念开发，储层模拟和现场测试。对该技术有两种不同的变化进行了评估。垂直混合注入剂刺激处理（MIST）过程涉及在底部以较厚的连续注水间隔完井。注入大段的混溶性注入剂（MI），然后注入一小段的混凝剂水。 MI清除了以前的MI注入未接触的岩石，并驱使EOR油来抵消生产者。它还在生产井附近建立了一个动员的石油库。然后可以在储层顶部重新修井并返回生产服务，或用于其他目的。将这种垂直驱动工艺与水平井眼结合使用特别有利。在侧井MIST过程中，从生产井或注入井沿储层底部钻一个水平侧井。将MI从先前未扫过的区域沿横向撕裂的EOR油依次注入几个间隔中。然后将侧井恢复到正常生产或注入服务状态。模拟数据表明，垂直MIST工艺可以以高达1000 stb / D的初始速率每口井回收200 Mstb的增量油。横向MISTrn过程的计算表明，每条横向可能回收超过一百万桶的增量EOR。rnMIST过程的现场结果喜忧参半，但总体而言令人鼓舞。目前，第一台MIST侧井的EOR增量响应约为1400 Mstb，从而在技术和经济方面取得了成功。随后的三个MIST侧向喷油嘴的响应变化很大。第一口竖井MIST几乎没有反应，但是它确实对Prudhoe湾的工艺性能提供了宝贵的见解。随后的垂直井MIST具有很大的注入MI量，非常成功，目前已回收600 Mstb以上。到2000年7月，MIST井的累计增产EOR为5000 Mstb，过去四年的平均增油率约为4000 stb / D。

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