平顶山北地热示范区PBR01井钻探施工实践

Drilling of Well PBR01 in the North Pingdingshan Geothermal Demonstration Area

摘要:

PBR01井是河南省有色金属地质矿产局在平顶山北组织实施的一口地热勘查示范井。完井深度2248.56 m，终孔直径216 mm。施工过程中遇到涌水、漏失、坍塌掉块、水敏失稳造浆等复杂地层及岩心采取率低等问题。本文从地层情况、井身结构设计、钻井工艺技术等方面介绍了该井的施工情况，总结取得的成果。通过采用改善钻井液性能、工艺堵漏、改进坚硬地层取心工艺、平衡法固井等措施解决施工中遇到的难题，为今后该地区中深部地热钻探积累一定的经验和技术。

Abstract:

Well PBR01 is a geothermal exploration demonstration well organized and implemented by Henan Nonferrous Metal Geology and Mineral Resources Bureau in the north of Pingdingshan. The completion depth is 2248.56 m and the final hole diameter is 216 mm. In the process of drilling， there were some problems， such as water gushing， leakage， collapse and stone falling， water sensitive instability， low efficiency of core recovery. This paper introduces the construction of the well from the aspects of geological formation， well structure design and drilling technology， and summarizes the achievements. By improving the performance of drilling fluid and plugging technology， improving the coring technology in hard formation， balanced cementing and other measures， the problems encountered in the construction were solved， and some experience and technology were accumulated for the middle and deep geothermal drilling in this area in the future.