胜科1井钻头选型与应用效果分析

Drill Bit Selection and Application Result Analysis in Well Shengke1

完钻井深7 026 m的胜科1井是我国东部油区目前最深科学探索井,在施工中除因复杂多变的地层孔隙压力致使其井身结构复杂、施工难度增大外,上部厚盐膏层、软泥岩和深部地层在高温、高压条件下可钻性变差等,极大制约了钻井速度的提高。为提高钻井速度,利用室内试验和测井资料建立了地层可钻性剖面和地层可钻性预测剖面,应用钻头技术效益指数最高的经验钻头选型方法对钻井资料进行了统计分析,根据地层可钻性剖面和统计分析结果推荐了与胜科1井地层相适应的钻头初步选型方案,给出了该井三开后的钻头选型推荐方案和建议。对钻头选型方案实施过程进行了跟踪并对所选钻头的使用效果进行了分析。分析结果表明,虽然钻井速度得到了提高,但没有达到预期的目标,应进一步进行深部地层岩石工程力学特性和钻头选型的研究。

Well Shengke-1,with a 7026m completed depth,is the deepest scientific exploration well in the east oilfield in China so far.The drilling rate was restricted by long salt-gypsum bed,soft mudstone in top formation and poor drillability in deep formation due to high pressure and high temperature,along with complex wellbore structure and difficulty in implementation due to the variable formation pore pressure.In order to increase drilling rate,the formation drillability profile and formation drillability prediction profile were created based on experiments and well logging data,the drilling data were analyzed based selection method of the performance.Given the formation drillability profile and the statistical analysis results the drill bit selection was proposed along with the recommended drill bit and suggestions after third section.Application results indicate that the drilling rate was increased while not reach the expected;therefore the more research on the rock mechanics and bit type selection should be conducted.