摘要
PDC钻头受破岩方式的影响,所形成岩屑颗粒小,增加了地质录井难度,尤其是在探井和水平井实施过程中,为了获取能满足地质录井的岩屑颗粒,在钻至储层前,需更换牙轮钻头钻进,不但降低了机械钻速和钻井效率,而且增加了钻井成本。微取心PDC钻头研制从常规破岩结构设计和微心结构设计两方面结构优化入手,以期达到钻进效率和岩屑粒径大小的最优匹配。北1井现场试验表明,研制微取心PDC钻头所形成岩屑颗粒大,能满足地质录井鉴定需求,同时机械钻速远高于牙轮钻头,为勘探开发提供了新的技术手段。
The cuttings produced by PDC bits are small in size,bringing difficulty to geological logging,especially in exploratory wells and horizontal wells. It is often necessary to change cone bits before drilling to the reservoir to get larger cuttings for logging,not only reducing ROP and drilling efficiency,but also increasing the drilling cost. A kind of microcore PDC bit is developed,combining conventional rock breaking structure design with micro coring structure design. Its test in Well North1 proves the cuttings by this bit is large enough for geologic logging,and ROP higher than that of roller bit. The microcore PDC bit provides a new way for petroleum exploration and development.
出处
《钻采工艺》
CAS
北大核心
2018年第4期19-21,6,共3页
Drilling & Production Technology
基金
中国石化华东油气分公司2015年开发先导项目"溱潼凹陷西斜坡钻井提速提效配套技术研究"
