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Impact of Pore Volume Compressibility on Recovery from Depletion Drive Miscible Gas Injection in South Oman

机译:孔隙体积压缩性对南阿曼省耗尽驱动和混溶气体注射的影响

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Rock Pore Volume Compressibility (PVC) data can be misinterpreted during the early life of reservoir development due to the fact that there are minimal amounts of this data acquired during early reservoir life. This data is typically obtained from uniaxial or hydrostatic tests using conventional core acquired during the appraisal phase of the reservoir. This article presents a case study from a cluster of reservoirs, in Southern Oman that highlights the importance of using PVC to determine reserves associated with both the primary depletion and miscible gas injection. The cluster is being developed in a phased approach. The key objective of each phase is to gather data from the different reservoirs to assess if a miscible gas injection project would be feasible. Permanent downhole pressure gauges have been utilized to monitor reservoir performance from the depletion phase and to aid in the forecasting of oil recovery for the miscible gas injection projects. The reservoir pressure in one of the reservoirs producing in the depletion phase has declined faster than expected and can be attributable to either lower than expected oil in place volume or a lower the expected PVC. Obviously, having lower oil volumes in place would greatly impact the economics of a miscible gasflood development. Therefore, renewed focus on proper evaluation of the PVC from the latest emerging core data from appraisal wells in a this reservoir has indicated that although the originally assumed PVC was within the uncertainty range, it was at the high range of the data and some of the measured data was skewing the average. A new look at the material balance and simulation results verified that PVC and not a reduction in OOIP was the root cause of the difference in performance estimates and the observed reservoir performance. By using a new lower average PVC, the observed reservoir pressure is found to be consistent with new material balance and reservoir simulation results. This approach has clearly, provided vital information to underpin the recoverable reserves associated with the miscible gas injection.
机译:由于在早期水库生活中获得的这种数据最小,因此在水库开发的早期寿命期间,岩石孔体积可压缩性(PVC)数据可能会误解。使用在储层的评估期间获得的常规核心,该数据通常从单轴或静液压试验获得。本文提出了一组水库,南欧群体的案例研究,突出了使用PVC来确定与初级耗尽和混溶气体注入相关的储备的重要性。群集正在以分阶段的方法开发。每个阶段的关键目标是收集来自不同水库的数据,以评估可混溶的气体注射项目是否可行。已利用永久井下压力表从耗尽阶段监测储层性能,并有助于对混溶气体注入项目进行储存的预测。在耗尽阶段生产的储存器中的一个储层压力下降速度比预期的速度快,可归因于低于预期的油状物体积或预期的预期PVC。显然,较低的石油体积将极大地影响混溶性气泡发展的经济性。因此,重新关注从该储层中的评估井中的最新新兴核心数据的适当评估PVC的专注已表明,尽管最初假设的PVC在不确定性范围内,但它处于数据的高范围和一些测量数据倾斜平均值。一种新的介绍材料平衡和仿真结果证实了PVC而不是ooIP的减少是性能估计差异的根本原因和观察到的储层性能。通过使用新的下平均PVC,发现观察到的储层压力与新材料平衡和储层模拟结果一致。这种方法明确地提供了重要信息,以支撑与可混溶气体注入相关的可收回储备。

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