Overview of monohole drilling technology

The monohole drilling technique is used to solve the issues of drilling deep, ultra-deep, and complex wells. Since it would not decrease the wellbore radius nor impact the follow-up drilling operation, the technique could decrease the drilling risk and improve wellbore scheme, what is more, ensure reaching the objective formation smoothly. The proceeding of monohole drilling technology was illustrated. The pilot test has been successfully carried out overseas, including the use of operation technology, and drilling tools. Domestically, the related technology RD have been carried out and finished the indoor experiment of key tools. The key of the technique are the expanding tube material, the connection type, operation technology and drilling tools. The advantages of the technique were illustrated, such as saving drilling cost, improving the safety reliance of drilling operation, and protecting environment. It was pointed out that the hybrid of monohole drilling and ERD would significantly quicken the drilling engineering development.