摘要
跟管钻进技术是解决复杂地层钻进的有效方法之一,针对跟管钻进过程中内外管环空间隙卡阻、钻具受力复杂、能耗大和套管连续下入深度有限、深孔干热岩花岗岩在热应力作用下破碎卡钻等技术难题,本文创新设计了一种双孕镶金刚石钻头跟套管连续钻进机构。理论分析表明:双钻头同心回转钻进岩屑小,避免内外管卡阻,极大地改善了钻具的受力状态,降低了钻具发生断裂的风险;内钻头通过齿轮啮合方式带动外钻头独立回转,相较于常规跟套管钻进能量消耗降低29.29%;外钻头采用高胎体交替式结构,有效避免了钻井液局部循环现象的发生,从而提高了套管连续下入的深度。该机构设计为跟套管钻进技术提供了一种新思路。
The technology of casing drilling is one of the effective methods to solve the problem of complex formation drilling.In view of the technical problems in the process of casing drilling,such as sticking in the annulus between the inner and outer tubes,complex load on the drilling string,high energy consumption,limited continuous running depth of casing,bit sticking in deep hole hot dry rock granite broken under the action of thermal stress,a continuous casing drilling mechanism with twin impregnated diamond bits is innovatively designed in this paper.Theoretical analysis shows that concentric rotary drilling with the twin bits produces small size cuttings to avoid sticking of both the inner and outer drilling strings,improve the stress state of the drilling tool and reduce the risk of breaking of the drilling tool.Compared with conventional casing drilling,the energy consumption of the inner bit is reduced by29.29%.The outer bit employs a high matrix with the staggered water port and reinforcement structure,which effectively avoids local circulation of drilling fluid and improves the continuous running depth of casing.The design of this mechanism provides a new idea for casing drilling technology.
作者
王金龙
高科
张宗正
赵研
谢晓波
WANG Jinlong;GAO Ke;ZHANG Zongzheng;ZHAO Yan;XIE Xiaobo(College of Construction Engineering,Jilin University,Changchun Jilin 130026,China)
出处
《钻探工程》
2022年第3期92-99,共8页
Drilling Engineering
基金
国家自然科学基金项目(编号:42172345,41972324)
地热资源开发技术与装备教育部工程研究中心开放课题(编号:21023,21022)。
关键词
跟管钻进
破碎地层
双钻头
孕镶金刚石钻头
高胎体
数值模拟
casing drilling
broken formation
twin bits
impregnated diamond bit
high matrix
numerical simulation
