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

doi:10.3969/j.issn.1672-7703.2020.02.014

Abstract

Abstract: 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 coefficient is greater than 2.2, and the temperature is about 200 ?C. Therefore, exploration and development operations in this area are extremely difficult. The conventional operation mode cannot meet the operating 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 is proposed, and described from the aspects of management innovation, technology optimization and big data. Research and practice have shown that the geological and engineering issues which affect 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 management and design of geology-engineering integration, establishing large databases for 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 have been 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 fine prediction, monitoring and control of formation depth, abnormal high pressure and drilling conditions. In the future, further big data platforms and intelligent exploration – development – drilling and completion schemes will be established, the application of geology- engineering integration will be deepened, and the exploration and development of similar complex oil and gas resources supported.

CLC Number:

Liao Gaolong, Guo Shusheng, Hu Yitao, Liang Hao, Gao Yongde, Wang Shiyue, Zhao Kai. Practice of the geology-engineering integration concept in high temperature and high pressure wells in the South China Sea[J]. China Petroleum Exploration, 2020, 25(2): 142-154.

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