地质工程一体化理念在南海高温高压井的实践

中国南海西部高温高压区域油气资源丰富,该区块主要目的层埋深超过4000m,地层压力系数大于2.2,温度在200℃左右,勘探开发作业难度巨大,常规作业模式无法满足高温高压井作业要求。基于此,针对高温高压井地质及工程特征,从管理创新、技术优化和大数据等方面提出南海高温高压井地质工程一体化理念及技术体系。研究及实践表明:通过地质工程一体化管理与设计优化钻井流程和取资料方案,建立地质工程一体化大数据库实现多源信息共享,研究地质工程一体化预测、监测及有效控制技术,可有效解决南海高温高压井地质及工程问题。探索形成的"随钻声波、中途VSP和随钻前视组合技术""地震、钻井、随钻测井、录井、中途VSP、随钻前视组合技术六位一体预监测技术""地质工程智能监测、安全预警体系"等一体化特色作业体系在层位深度、异常高压、钻井情况等的精细预测、监测和控制方面取得了较好的应用效果。未来可通过进一步建设大数据平台和智能化勘探—开发—钻完井方案,深化地质工程一体化的应用,助力类似复杂油气资源的勘探与开发。

Practice of the geology-engineering integration concept in high temperature and high pressure wells in South China Sea

The high temperature and high pressure area in the western South China Sea is rich in oil and gas resources.The buried depth of the main target layer in this area is deeper than 4000 m,the formation pressure coeffi cient is larger than 2.2 and the temperature is about 200℃.Therefore,the exploration and development operation in this area is extremely diffi cult.The conventional operation mode cannot meet the operation requirements for high temperature and high pressure wells.Based on this situation,according to the geological and engineering characteristics of high temperature and high pressure wells,the concept and technical system of geology-engineering integration of high temperature and high pressure wells in the South China Sea are proposed from the aspects of management innovation,technology optimization and big data.The researches and practices show that the geological and engineering issues for high temperature and high pressure wells in the South China Sea can be effectively solved by optimizing the drilling process and data acquisition scheme through the management and design of geology-engineering integration,establishing the Large Data Bases of geology-engineering integration to achieve multi-source information sharing,and studying the prediction,monitoring and effective control technologies of geology-engineering integration.A series of integrated special operation systems were formed,such as“combination technology of Acoustic-Logging-While-Drilling(ALWD),midway-VSP and look-ahead-while-drilling”,“the six-in-one pre-monitoring technology of seismic,drilling,logging-while-drilling,mud logging,midway-VSP,and look-ahead-while-drilling combination”,“geology-engineering intelligent monitoring and safety early-warning system”,etc.These operation systems have achieved good application results in fi ne prediction,monitoring and control of formation depth,abnormal high pressure and drilling conditions.In the future,we can further establish big data platform and intelligent exploration–development-drilling and completion schemes,deepen the application of geology-engineering integration,and support the exploration and development of similar complex oil and gas resources.