元坝区块提高钻井速度技术方案探析

Discussion on Drilling Technology for Increasing ROP in Yuanba Block

摘要:

在总结分析前期钻井经验的基础上，从地质因素、钻井复杂情况、岩石可钻性、地层温度、钻井液密度、井身结构等方面分析了目前影响元坝区块深井钻井速度提高的因素。指出井身结构层次有限，不能完全有效封隔不同压力体系的地层以及须家河组地层可钻性差、埋深较深、段长，不能利用空气钻进行钻进是影响机械钻速的2个最重要原因。提出了气体钻井方案、钻头选型方案、进口动力钻具配合高效钻头钻须家河地层方案,以及采用特种井眼尺寸井身结构方案，为元坝区块深井钻井提供技术支持。

Abstract:

Based on the summery of previous drilling experience, analysis was made on the factors which influence ROP in deep well drilling in Yuanba Block from the aspects of geologic factors, complex drilling conditions, rock drillability, formation temperature, mud density and casing program. There are 2 main affecting factors: one is the limit of wellbore configuration stratification, which can not effectively seal the formations with different pressure system; another is that the gas drilling can not be used because of bad formation drillability with a deep and long drilling section. Gas drilling, bit selection and dynamic drilling tool coordinating with high efficiency bit scheme are presented for Xujiahe formation drilling and casing program with particular well size are introduced to give technical support for deep well drilling in Yuanba Block.