Supporting technology for fast drilling and its application in the central deep buried hill zone in the Raoyang sag

doi:10.3969/j.issn.1672-7703.2020.06.009

Abstract

Abstract: There are a number of technical issues that affect the process of drilling in the central deep buried hill zone in the Raoyang Sag, Jizhong Depression. These include the large formation dip angle, complex formation pressure system, poor drillability of deep formations, instability of sidewalls, and a steep geothermal gradient. Technical research has been carried out with the objectives of increasing drilling speeds, reducing drilling costs, and accelerating the exploration and development process. Supporting technologies for fast drilling have been developed based on non-standard wellbore configuration optimization, surface pre-displacement of wellheads, simple managed pressure drilling, customized PDC bit design, polyamine KCl drilling fluid systems, etc. Following on-site application in Well YT1, average rate of penetration (ROP) increased by 39.86% compared with adjacent wells, the complex drilling time was reduced from 5.4% to zero, and the well construction period was shortened by 44.19%—a significant enhancement of drilling speed.

CLC Number:

Zhang Yiming, Li Jingying, Luo Yucai, Yang Kai, Wang Dongming, Cao Xiaobing, Peng Yu, Zhao Weifeng, Zhong Xiaojun, Lu Hao. Supporting technology for fast drilling and its application in the central deep buried hill zone in the Raoyang sag[J]. China Petroleum Exploration, 2020, 25(6): 87-93.

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