下扬子地区页岩气地质调查皖望地3井钻井设计与施工技术

Drilling design and construction technology of shale gas geological survey Well Wanwangdi-3 in the Lower Yangtze Block

摘要:

大口径页岩气地质调查井皖望地3井部署在下扬子陆块沿江岰陷带望江凹陷，是一口定向井，设计井深1950 m，完钻井深1985 m。钻探目的是探索二叠系大隆组、龙潭组及孤峰组含气性，并验证区域地层层序。本文介绍了钻井设计和施工过程，针对钻井作业中的险点和难点问题，通过预判和实钻相结合策略，提出了钻井安全、定向钻进、钻井液使用管理以及地质云钻井工况实时监测等4项技术保障措施，确保了钻井任务顺利完成。最后，结合实钻情况和测井数据对钻井质量、效率及取心质量进行了分析评述，实现了无重大井内事故发生，钻井质量合格，施工进度高效的目标，取得了较好的经济效益，为该地区大口径钻井工程施工提供了较好的技术经验。

Abstract:

The Well Wanwangdi-3 （hereinafter referred to as Well WWD-3） is a large-diameter shale gas geological survey directional well which was deployed in Wangjiang Depression of the Lower Yangzi Block， the design depth is 1950m， and the total depth is 1985m. The purpose of drilling is to explore the gas content of the Permian Dalong Formation， Longtan Formation and Gufeng Formation， and verify the regional stratigraphic sequence. This paper introduces the well design and construction process of Well WWD-3， in view of the risks and problems in drilling process， combining the predictive and actual drilling， four technical guarantee measures are put forward including drilling safety， directional drilling， drilling fluid use management and geocloud real-time monitoring of drilling conditions， to ensure the smooth and successful completion of drilling tasks. Finally， combining the actual drilling situation and logging data， the drilling quality， efficiency and core quality were analyzed. The goals of no major accidents during the drilling process， qualified drilling quality， and high-efficient construction progress were achieved. Good economic benefits were obtained， meanwhile， good technical experience for the construction of large-diameter drilling projects in this area is also provided.