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Petroleum Science >2018,??Issue 4:??830-840 DOI:

Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations Open?Access

文章信息

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作者：Huai-Zhong Shi, Zhao-Sheng Ji, He-Qian Zhao, Heng-Yu Song and Zhen-Liang Chen
作者單位：

State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China; College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China,State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China; College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China,State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China; College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China,State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China; College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China and State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China; College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China

投稿時(shí)間：2018-04-10
引用方式：

文章摘要

To improve the rate of penetration (ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller. According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning. Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method.

關(guān)鍵詞

    Partial underbalanced drilling, Coiled tubing, Flow fields, Cuttings removal, Rate of penetration (ROP)