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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Case Study: Maximizing Productivity with Extreme Underbalance Perforation
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Case Study: Maximizing Productivity with Extreme Underbalance Perforation

机译：案例研究：利用极端的欠平衡射孔最大化生产率

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Tunu field is the major gas supplier of the East Kalimantanrnsystem. It started producing in 1990 and more than 200 wellsrnhave been drilled to date. The field exported an average 1.3rnbcf/d in 2000.rnIn early 1999, extreme underbalance perforation (EUB)rnwas introduced for monobore wells to reduce the skin effect tornprovide more flow capacity and maximize hydrocarbonrnrecovery from the reservoir. The differential pressure betweenrnthe wellbore and the formation creates a sufficient drawdownrnto instantaneously clean the perforated channels as soon asrnthey are made. The challenge is to safely perforate under arndrawdown of few 1000’s psi instead of few 100’s psi forrnclassical perforations.rnThe anchor + stackable perforating gun system has beenrnevaluated and improved to permit EUB perforating to bernperformed safely. The heart of the EUB gun system is arnmechanical release anchor that secures the guns firmly duringrnperforation avoiding the risk of lifting the tool inside thernwellbore. As there is no wireline cable while perforating, thernwell is flowing instantaneously allowing immediate clean up.rnUsing this system, the underbalance is now limited only by:rnthe drawdown on the formation (limited in case of depletedrnsand) and the potential risk to destabilize the formation andrnproduce sand formation.rnSo far, 20 jobs have been done safely on Tunu field withrnthe differential pressure up to 4800 psi, without sandrnproduction. The paper will describe the operation proceduresrnand the statistical approach (PBU results) demonstrating thernbenefit of EUB technique.rnFor Tunu field, this perforation technique increases inrnaverage by 15% the initial productivity compared to classicalrnperforations for a relatively low incremental cost.
机译：Tunu油田是东加里曼丹系统的主要天然气供应商。它于1990年开始生产，迄今为止已钻探200多口井。该油田在2000年的平均出口量为1.3rnbcf /d。1999年初，为单孔井引入了极度欠平衡射孔（EUB）rn，以减少趋肤效应，从而提供更大的流量，并最大程度地提高油气藏的采收率。井眼与地层之间的压差会产生足够的压降，以便在钻孔后立即清洁穿孔的通道。面临的挑战是要在几千英尺psi的压降下安全穿孔，而不是几百英寸psi的经典穿孔。锚定+可堆叠射孔枪系统已经过重新评估和改进，可以安全地对EUB射孔进行变形。 EUB喷枪系统的核心是自动机械释放锚，可在穿孔过程中牢固地固定喷枪，从而避免将工具举升到井眼内的风险。由于射孔时没有电缆，因此井眼瞬时流动，可以立即清理。使用该系统，欠平衡现在仅受以下因素限制：地层的水位下降（如果砂土耗尽，则受到限制）以及破坏地层稳定性的潜在风险到目前为止，已经在Tunu油田安全地完成了20项作业，压差高达4800 psi，没有沙尘产生。本文将描述操作程序和统计方法（PBU结果），以证明EUB技术的益处。对于Tunu油田，与传统穿孔相比，这种穿孔技术将平均生产率提高了15％，且增量成本相对较低。

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