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首页> 外文会议>Offshore Europe Oil Gas Conference Exhibition >Clair Field: Reducing Uncertainty in Reservoir Connectivity During Reservoir Appraisal-A First-Time Application of a New Wireless Pressure-Monitoring Technology in an Abandoned Subsea Appraisal Well
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Clair Field: Reducing Uncertainty in Reservoir Connectivity During Reservoir Appraisal-A First-Time Application of a New Wireless Pressure-Monitoring Technology in an Abandoned Subsea Appraisal Well

机译：克莱尔·菲尔德（Clair Field）：降低储层评估过程中储层连通性的不确定性-一种新型无线压力监测技术在废弃的海底评估井中的首次应用

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Reservoir connectivity is a key uncertainty when considering field appraisal and development options. Reducing this uncertainty can provide significant benefits in optimising the field development plan. Through the application of new wireless telemetry technology (Expro CaTSTM), a fully abandoned subsea appraisal well has been cost effectively converted into a valuable reservoir monitoring asset. Clair Ridge appraisal well 206/8-13Y was drilled in 2006 and located some 8km from the existing Clair production platform. The well was the first step in an appraisal programme designed to confirm the next stage of development of the Clair Field. Reservoir connectivity and the risk of compartmentalisation are key uncertainties for development of the Clair reservoir (ref.1). On completion of testing operations, the well would typically have been permanently abandoned and of no further value for reservoir monitoring purposes. By installing a battery powered, wireless pressure monitoring system in the well at the time of final abandonment, it was possible to monitor for any fluctuations in the reservoir pressure in the Clair Ridge resulting from production / injection events on the Clair platform. This newly emerging wireless telemetry technology transmits data from the reservoir to the seabed using the well casing as the communication path and advantageously, the signal is not attenuated by the presence of cement or bridge plugs in the wellbore. The reservoir pressure and temperature data that transmitted up the casing, is collected and stored by a CaTS subsea receiver located on the seabed. The stored data can be recovered, on demand, by a supply vessel located overhead using well established through seawater acoustic communications. The use of a wireless gauge enabled a downhole well abandonment to be performed. The traditional method forconverting subsea appraisal wells for pressure monitoring has utilised a gauge and cable system (ref.2). This approach requires a relatively complex and costly semisub rig workover for final well abandonment. With the CaTS system, the well can be left fully abandoned downhole to UKOOA category 1 at the end of appraisal drilling. The remaining abandonment liability is just for recovery of the seabed receiver and final severance of the wellhead using a diving support vessel. This paper demonstrates that advances in wireless telemetry technology now enables critical reservoir data to be obtained from suspended/abandoned subsea wells or zones, where previously there was no cost effective means to do so. By monitoring the reservoir pressure variations in the abandoned Clair Ridge appraisal well, clear evidence of reservoir connectivity to the existing Clair platform reservoir area was demonstrated. This world first successful application of new wireless telemetry technology in a UKOOA category 1 subsea abandoned well marks a milestone achievement in advancing technologies that can cost effectively reduce uncertainty in reservoir connectivity at the field appraisal and development stages.
机译：在考虑现场评估和开发方案时，储层连通性是关键的不确定性。减少这种不确定性可以为优化现场开发计划提供巨大的好处。通过应用新的无线遥测技术（Expro CaTSTM），已完全废弃的海底评估井已被成本有效地转化为宝贵的储层监测资产。 Clair Ridge评估井206 / 8-13Y于2006年钻探，位于距现有Clair生产平台约8公里处。该油井是旨在确定克莱尔油田下一阶段开发计划的第一步。油藏连通性和分隔风险是克莱尔油藏开发的关键不确定因素（参考资料1）。在完成测试操作后，该井通常将被永久废弃，并且对储层监测没有任何进一步的价值。通过在最终弃井时在井中安装电池供电的无线压力监测系统，可以监测由于Clair平台上的生产/注入事件而导致的Clair Ridge储层压力的任何波动。这项新兴的无线遥测技术使用井套管作为通信路径将数据从储层传输到海床，并且有利的是，井眼中没有水泥或桥塞，因此信号不会衰减。沿套管传输的储层压力和温度数据由位于海底的CaTS海底接收器收集和存储。可以通过位于上方的供应船使用通过海水声通信建立的井来按需恢复存储的数据。使用无线仪表可以进行井下废弃井作业。转换海底评估井以进行压力监测的传统方法是利用仪表和电缆系统（参考资料2）。这种方法需要相对复杂且成本高昂的半钻机修井作业，以最终弃井。借助CaTS系统，在评估钻探结束时，可将井完全弃置至UKOOA 1类井下。剩下的遗弃责任仅是为了收回海床接收器和使用潜水支援船对井口进行最后的遣散。本文证明了无线遥测技术的发展现在使得能够从悬挂/废弃的海底井或区域中获取关键的储层数据，而以前在这方面没有任何经济有效的手段。通过监测废弃的Clair Ridge评估井中的储层压力变化，证明了储层与现有Clair平台储层之间的连通性的明确证据。这是世界上首次成功将新的无线遥测技术应用于UKOOA 1类海底废弃井中，这标志着先进技术的里程碑式成就，该技术可以经济有效地减少现场评估和开发阶段油藏连通性的不确定性。

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