To provide experience and promote the development of deep and ultra-deep well drilling technology, taking Well SY001-H6 on the Shuangyushi structure in northwestern Sichuan Basin as an example, the characteristics of the formation and the problems encountered during drilling such as slow rate of penetration (ROP), fatigue of small drilling tools, high risk of well control, high bottom hole temperature and difficult orientation of long horizontal sections were analyzed. Then, solutions were proposed from the aspects of bit optimization, drilling fluid density adjustment and selection of supporting tools. Meanwhile, rational equipment configuration was carried out. Field application results show that these technical measures have achieved remarkable ROP enhancement and provided safety guarantee for deep and ultra-deep well drilling.
SU Y N , LU B P , LIU Y S , et al . Status and research suggestions on the drilling and completion technologies for onshore deep and ultra deep wells in China [J]. Oil Drilling & Production Technology , 2020 , 42 ( 5 ): 527 - 542 .
TAN B . Integrated application of safe and rapid drilling and completion technology in Xiangguosi gas storage [J]. Drilling & Production Technology , 2022 , 45 ( 1 ): 11 - 20 .
YANG Y , WEN L , XIE J R , et al . Progress and directionof marine carbonate gas exploration in Sichuan and Chongqing region [J]. China Petroleum Exploration , 2020 , 25 ( 3 ): 44 - 55 .
HE R M , ZHAO L , HUANG X , et al . Path for integrated development of natural gas and hydrogen in the Sichuan⁃Chongqing region [J]. Natural Gas Industry , 2023 , 43 ( 9 ): 162 - 173 .
GUO X S , HU D F , HUANG R C , et al . Deep and ultra⁃deep natural gas exploration in the Sichuan Basin: progress and prospect [J]. Natural Gas Industry , 2020 , 40 ( 5 ): 1 - 14 .
SONG D D , LUO X , HE M M . Development and application of ø812.8 mm PDC bit for myriameter ultradeep wells [J]. China Petroleum Machinery , 2025 , 53 ( 2 ): 31 - 36 .
ZOU C N , ZHAO Q , CHEN J J , et al . Natural gas in China:development trend and strategic forecast [J]. Natural Gas Industry , 2018 , 38 ( 4 ): 1 - 11 .
HE X , CHEN G S , WU J F , et al . Deep shale gas exploration and development in the Southern Sichuan basin:new progress and challenges [J]. Natural Gas Industry , 2022 , 42 ( 8 ): 24 - 34 .
LI J , SHE Y Q , GAO Y , et al . Natural gas industry in China: development situation and prospect [J]. Natural Gas Industry , 2020 , 40 ( 4 ): 133 - 142 .
DAI J X , NI Y Y , DONG D Z , et al . 2021—2025 is a period of great development of China's natural gas industry: suggestions on the exploration and development of natural gas during the 14th five⁃year plan in China [J]. Natural Gas Geoscience , 2021 , 32 ( 1 ): 1 - 16 .
JIA A L , HE D B , WEI Y S , et al . Predictions on natural gas development trend in China for the next fifteen years [J]. Natural Gas Geoscience , 2021 , 32 ( 1 ): 17 - 27 .
SUN Y X , YANG B Z , QIAO L H . Optimization design of complex deep and ultra deep well bore structure in Northwest Sichuan [C]∥ Proceedings of 2017 National Natural Gas Academic Annual Conference . Hangzhou : Natural Gas Professional Committee of China Petroleum Society , 2017 : 2576 - 2581 .
YE J L , SHEN J W , WU Y J , et al . Key techniques of drilling penetration rate improvement in ultra⁃deep well Chuanshen⁃1 [J]. Petroleum Drilling Techniques , 2019 , 47 ( 3 ): 121 - 126 .
TAN B . Key technologies and prospects of deep shale gas engineering in the Southern Sichuan basin [J]. Natural Gas Industry , 2022 , 42 ( 8 ): 212 - 219 .
ZHAO L Z , WANG Z C , YANG Y , et al . Important discovery in the second member of Dengying formation in well Pengtan1 and its significance, Sichuan basin [J]. China Petroleum Exploration , 2020 , 25 ( 3 ): 1 - 12 .
WANG J , FAN X Y . Supporting schemes to optimize fast drilling of ultra⁃deep wells,Jiulongshan area, Sichuan basin [J]. Natural Gas Exploration and Development , 2020 , 43 ( 1 ): 28 - 35 .
HU D L , OU B , ZHANG D P , et al . Drilling optimization design of ultradeep well CS1 in Sichuan and Chongqing region [J]. Drilling & Production Technology , 2020 , 43 ( 2 ): 34 - 37 .
ZHOU D S , YANG H , HU X H , et al . Study on ROP improvement technology for large⁃size ultradeep wellsat Shuangyushi structure in western Sichuan [J]. Drilling & Production Technology , 2019 , 42 ( 6 ): 25 - 27,36 .
SU Q , HE S M , HU X H , et al . Research and application on rock drillability and bitselection of difficult drilling formations in Shuangyushi structure of western Sichuan and Chongqing region [J]. Drilling & Production Technology , 2019 , 42 ( 2 ): 124 - 127 .
SONG D D , REN Z P , YANG Y X , et al . Research on cutter surface shapes and rock breaking efficiency under high well temperature [J]. Geoenergy Science and Engineering , 2023 , 222 : 211422 .
ZHANG D W . Prospects for the development of natural gas industry in the Sichuan and Chongqing region in the next decade [J]. Natural Gas Industry , 2021 , 41 ( 8 ): 34 - 45 .