牛D1井复杂构造带绳索取心钻探工艺技术研究

Research on Wire-line Core Drilling Technology for Niu D1 Well in Complex Structural Belt

摘要:

复杂构造带的绳索取心钻探易发生井漏、井塌以及取心困难等难题，处理不当甚至可导致井眼报废。结合牛D1井实例，介绍了绳索取心钻探工艺在复杂地层所遇的施工难点，并分析诱发井漏、井塌以及取心困难的原因，指出常规防塌堵漏技术不能满足复杂构造带钻探施工原因，提出优选钻井液、优化钻具组合以及改进堵漏工艺等现场可操作的具体改进措施。总结的施工经验可为今后复杂构造带绳索取心钻探施工提供宝贵经验。

Abstract:

Wire-line core drilling is prone to the problems such as lost circulation, borehole collapse and coring difficulty in complex structural belt, some improper handling or even leads to hole being abandoned. This paper introduces the construction difficulties of wire-line core drilling in complicated area with the example of Niu D1 well, and analyzes the inducing factors of lost circulation and borehole collapse, as well as the reasons for coring difficulties; then points out the reasons why the conventional anti-collapse and plugging technologies can not meet the needs of drilling construction in complex structural belt, and puts forward some operational specific improvement measures to optimize drilling fluid, optimize drilling assembly and improve plugging process. The experience summary of Niu D1 well construction could be the reference for the future construction of wire-line core drilling in complex structural belt.