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2025 Vol. 42, No. 2

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FORUM
The Status-Quo of the Application and Research and Prospect of Oil and Gas Large Model in Well Drilling and Completion Industry
WU Yaohui, LIU Meiquan, LI Xuesong, LIU Changyue
2025, 42(2): 143-154. doi: 10.12358/j.issn.1001-5620.2025.02.001
Abstract(105) HTML (40) PDF (4131KB)(44)
Abstract:
Represented by industrial large models, artificial intelligence (AI) technology plays an important role in oil and gas exploration and development. AI not only can effectively reduce costs and improve efficiency, but also opens an important way to promote key technical innovation and upgrading, and ...
DRILLING FLUID
Drilling fluid technology for deep subsurface Tako-1 well
SUN Jinsheng, WANG Jianhua
2025, 42(2): 155-166. doi: 10.12358/j.issn.1001-5620.2025.02.002
Abstract(115) HTML (32) PDF (5900KB)(65)
Abstract:
The drilling process of deep-earth Tako-1 well is confronted with a series of extreme conditions such as ultra-high temperature, ultra-high pressure and ultra-high salt. These complex conditions bring great challenges to drilling fluid technology. As the "blood" in drilling process, the performance ...
The Dynamic Response Characteristics of Ballooning Effect in Deep Fractured High Temperature High Pressure Formations in Deep Water Drilling
WU Yanhui, HUANG Honglin, LUO Ming, LI Wentuo, MA Chuanhua, DAI Rui, LI Jun
2025, 42(2): 167-179. doi: 10.12358/j.issn.1001-5620.2025.02.003
Abstract(86) HTML (35) PDF (4546KB)(26)
Abstract:
Deep formations in deep water area are developed with fractures and fissures, fluctuations in wellbore pressure during drilling can easily induce ballooning effect which is made complex by the high temperature high pressure (HTHP) downhole environment. Studies on the ballooning effect of fractures i...
Drilling Fluid Technology for the Deepest Vertical Well in Asia – The Ultra-Deep Well Pengshen-6
XU Yi, HE Tao, WANG Jun, OU Meng, YAN Fushou, ZHOU Huaan, HUANG Xuyao
2025, 42(2): 180-186. doi: 10.12358/j.issn.1001-5620.2025.02.004
Abstract(94) HTML (25) PDF (2066KB)(45)
Abstract:
Well Pengshen-6, a six-interval well with a total depth of 9,026 m, is a key exploration well deployed by the PetroChina Southwest Oil & Gasfield Company. The projected reservoir is mainly the Dengying Formation in the Sinian System. The main technical difficulties of the drilling fluid operatio...
Mechanisms of Water Block Damage of High Temperature Reservoirs Based on In-situ Characterization of Wettability and Subcritical Water Characteristics
SHAN Kai, QIU Zhengsong, CHENG Zheng, YANG Mengtao, LI Kai, ZHONG Hanyi, REN Xiaoxia
2025, 42(2): 187-194. doi: 10.12358/j.issn.1001-5620.2025.02.005
Abstract(84) HTML (26) PDF (4011KB)(22)
Abstract:
Study on the in-situ wettability of deep reservoir rocks is of great importance to the in-depth understanding of the mechanisms with which a high temperature reservoir is damaged by water block and to the establishment of efficient measures for water block prevention. In this study, cores from a dee...
Study on Wellbore Instability Mechanism of Continental Shale Reservoir in Northeastern Sichuan Basin
GAO Shuyang, BO Kehao, ZHANG Yayun, GAO Hong, HUANGFU Jinglong
2025, 42(2): 217-224. doi: 10.12358/j.issn.1001-5620.2025.02.009
Abstract(84) HTML (29) PDF (2755KB)(41)
Abstract:
Shale reservoirs in the Qianfoya continental facies shale reservoirs in northeastern Sichuan collapsed seriously, leading to severe difficulties in drilling a well successfully. To deal with this problem, a systematic analysis of instability characteristics and laboratory experimental evaluation stu...
High Plugging Capacity Drilling Fluid Technology for Deep Buried Coal-Bed Methane Drilling in Jizhong Area
LUO Yucai, YU Huamin, SUN Hao, YU Jiantao, FENG Dan, LIU Fei
2025, 42(2): 225-232. doi: 10.12358/j.issn.1001-5620.2025.02.010
Abstract(63) HTML (17) PDF (3188KB)(39)
Abstract:
Horizontal drilling of deep buried coal-bed methane in Jizhong area has been faced with several difficulties and challenges such as quite limited data for reference, many geologic uncertainties, thin coal-bed layers which are easy to collapse and have difficulties in trajectory control, as well as h...
Methods of Measuring Formate Content in Drilling Fluids
ZHANG Xiaoguang, YANG Junzhen, WANG Ping, LI Bin, LI Huimin, CHEN Leixu, ZHANG Lingying
2025, 42(2): 233-238. doi: 10.12358/j.issn.1001-5620.2025.02.011
Abstract(69) HTML (22) PDF (2126KB)(30)
Abstract:
In studying the standards concerning sodium formate and potassium formate as drilling fluid additives, the major problems existed in and factors affecting the measurement of the concentrations of formates were analyzed, and a best detection method was screened out through optimization of many method...
CEMENTING FLUID
The Toughening Mechanisms of Tough Cement Slurries for the Underground Gas Storage in North China
LI Lichang, CAO Hongchang, GAO Yang, LIU Jingli, MA Jun, HUANG Jian, LIU Junhua, SUN Wenzhao
2025, 42(2): 239-246. doi: 10.12358/j.issn.1001-5620.2025.02.012
Abstract(60) HTML (28) PDF (3064KB)(25)
Abstract:
As the important engineering of China’s “energy resource supply guarantee”, underground gas storage (UGS) has three functions, which are seasonal peak shaving, emergency response to accidents and national energy strategic reserve. The formations into which the UGSs have been built in north China gen...
Thermal Damage of Set Silicate Cement in Ultra-High Temperature Xerothermic Environment
LI Xiaojiang, WANG Yueyang, XIAO Jingnan, WEI Haoguang, YANG Ruiyue
2025, 42(2): 247-254. doi: 10.12358/j.issn.1001-5620.2025.02.013
Abstract(57) HTML (16) PDF (2943KB)(20)
Abstract:
In coal gasification and shale gas in-situ development, the bottoms of the wellbores are in an ultra-high temperature xerothermic environment, which is of great challenge to the thermal stability of the cement sheaths. To deal with this challenge, the deterioration of set silicate cement long expose...
Synergistic Effects of Tricalcium Aluminate and Gypsum on Performance of Oil Well Cement Slurries
DAI Dan, WANG Yixin, ZOU Yiwei, SUN Chao, MA Ying, SONG Xinjun
2025, 42(2): 255-261. doi: 10.12358/j.issn.1001-5620.2025.02.014
Abstract(45) HTML (16) PDF (2923KB)(16)
Abstract:
To better control the quality of oil well cement, class G cement clinkers with different contents of tricalcium aluminate (C3A) were mixed with different kinds of gypsums, and study was conducted on the synergistic effects of C3A and gypsum on the gelling time, thickening property, compressive stren...
FRACTUREING FLUID & ACIDIZING FLUID
Rheology of a Viscoelastic Hexameric Cationic Surfactant Micellar Fracturing Fluid
BIN Yujie, HAN Xiaoyang, TIAN Zhenrui, WU Zhiying, ZHANG Siqi, FANG Bo, LU Yongjun
2025, 42(2): 262-274. doi: 10.12358/j.issn.1001-5620.2025.02.015
Abstract(35) HTML (11) PDF (3044KB)(17)
Abstract:
In developing new viscoelastic (VES) thickening agents and new fracturing fluids, several raw materials, including ethylenediamine, epichlorohydrin, erucamide propyl dimethyl tertiary amine (PKO-E) and sodium chloroacetate were used to first produce tetrameric cationic surfactant (TET), hexameric ca...
Preparation and Evaluation of a Temporary Plugging Organosilicon Diverting Agent for Fracturing Fluids
LIU Yi, YU Chenglin, LI Yunzi, JIANG Ximei, YU Yangyang, WU Jun, LIU Jing
2025, 42(2): 275-282. doi: 10.12358/j.issn.1001-5620.2025.02.016
Abstract(40) HTML (9) PDF (5456KB)(15)
Abstract:
Particulate temporary plugging agents presently used in fracturing fluids are mostly rigid, and deficiencies exist in using these plugging agents, such as insignificant pressure buildup, short pressure stabilization time and inability to effectively transfer stress etc. To deal with these problems, ...

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