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作者： JIANG, Guancheng SUN, Jinsheng HE, Yinbo ZHANG, Xin PENG, Chunyao dONG, Tengfei TAN, Bin GENG, Tie YANG, Lili LUO, Xiaohu LUO, Xuwu LIANG, Xing CHEN, Changwei LIU, Xiaobo CHENG, rongchao LUO, Jiansheng ZHANG, Jianguo WANG, Yong FU, daqi rAN, Qifa ZHAO, Li CUI, Kaixiao NI, Xiaoxiao

标准号: EP4155364(A1)

The present invention relates to the field of petroleum industry phase oilfield chemistry, and specifically relates to a bionic and dual-phobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor. The present invention uses the theory of bionics and the theory of a downhole rock surface being double phobic as a basis. By means of using the bionic wall-fixing agent, the bionic lubricant, the super dual-phobic agent, the scrap-carrying agent and the bionic shale inhibitor, which have special properties of imitating animals and plants in nature, and using a series of bionic treatment agents, a set of bionic and dual-phobic drilling fluid systems, which corresponds to an unconventional, complex oil and gas well, is formed.

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design and test of a torque-on-kelly measuring instrument 10

Design and test of a torque-on-kelly measuring instrument

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10th International Forum on Electrical engineering and Automation, IFEEA 2023

作者： Ma, rutao Yuan, Guohai Ai, Fei Li, Guoping Ye, Tingfu Luo, Jingbing Liu, Junlin Xia, Xue Yan, Shengpeng Cnpc Engineering Technology R&d Institute Llc Beijing100126 China Cnooc China Ltd. Shen Zhen Branch Shenzhen518000 China Qinghai Oilfield Company Llc Petrochina Dunhuang736202 China

ISBN: (纸本)9798350309379

The torque on kelly measuring instrument is mainly used for real-time measurement of the dynamic torque on the lower joint of the kelly during drilling and workover processes. Safety of the operation could be evaluated based on measuring results. By analyzing the mechanical properties of metal materials under dynamic working conditions, engineering materials are selected. The main structure of the torque measuring instrument is designed in a small mandrel type. The torque measuring bridge and electric circuit are configured to realize real-time torque testing. Experimental platform was built to verify and analyze multiple sets of data, verifying the feasibility, effectiveness, and accuracy of the design. The research results provide a real-time torque testing method and technical support for drilling and workover operations. © 2023 IEEE.

关键词： Circuit design real time measurement Structural design Torque on kelly

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Key technology of drilling Speed Increase and deviation Control in Inclined Formation of Bongor Basin in Chad 12th

Key Technology of Drilling Speed Increase and Deviation Cont...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Zhong, Zhao Zhong, Hong-Wei Gu, Yi-Xin Li, Xiao-Gang Ji, Fei Xiao, Yue Li, Gan-Lu Wang, Yin-Ze CNPC Engineering Technology R and D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing100034 China BGP Inc China National Petroleum Corporation Zhou072751 China

ISBN: (纸本)9789819919635

Bongor basin is the main oilfield of cnpc, and P formation is the main exploration layer. Under the strong fault depression in the early Cretaceous, the dip angle of M and P formation is large with frequent lithology change, which makes it difficult to anti-deviation in drilling process. Moreover, r, K, M and P formations contain flint, so the rOP is low and the bit consumption is large. In order to control well deviation effectively and improve rOP, based on the analysis of formation characteristics and lithology, the fast drilling and anti-deviation technologies focusing on motorâ€‰+â€‰MWd, torque impactor and T-type PdC bit for inclined formation in Bongor basin of Chad are innovated, and field application were carried out. The results show that the wellbore quality of the applied well section meets the requirements of the industry standard. Compared with the conventional BHA, the average deviation is reduced by 57.31%, the average rOP in φ311.2 mm and φ241.3 mm borehole increased by 51.04% and 47.28% respectively. Moreover, the bit consumption of single well is reduced by 37.45%, which provides reference and guidance for high efficient drilling operation in inclined formation of Bongor basin in Chad. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Lithology

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BIONIC ANd dUAL-PHOBIC HIGH-PErFOrMANCE WATEr-BASEd drILLING FLUId

BIONIC AND DUAL-PHOBIC HIGH-PERFORMANCE WATER-BASED DRILLING...

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作者： Guancheng JIANG Jinsheng SUN Yinbo HE Xin ZHANG Chunyao PENG Tengfei dONG Bin TAN Tie GENG Lili YANG Xiaohu LUO Xuwu LUO Xing LIANG Changwei CHEN Xiaobo LIU rongchao CHENG Jiansheng LUO Jianguo ZHANG Yong WANG daqi FU Qifa rAN Li ZHAO Kaixiao CUI Xiaoxiao NI

标准号: US20230133053(A1)

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research on the Correlation Analysis Between Logging Parameters and rock drillability Based on random Forest

Research on the Correlation Analysis Between Logging Paramet...

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Frontiers technology of Information and Computer (ICFTIC), IEEE International Conference on

作者： Congyue Lv Fei Zhao Yan ding Yi Cui reyu Gao Ge Wang Yumeng Tian Wenting Jia Boyang Lin Linfeng Li CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering China University of Petroleum (Beijing) Beijing China

ISBN: (数字)9798331541750

ISBN: (纸本)9798331541767

The rock drillability grade value is a comprehensive parameter that measures the ease or difficulty of rock fragmentation during drilling. determining this parameter is crucial for guiding bit selection and predicting drilling speed. There exists a strong correlation between certain logging parameters and the rock drillability grade value. To explore this correlation, a common practice is to use the Pearson correlation coefficient method, which mainly investigates the linear relationship between variables. However, relationships among complex formation characterization parameters are often nonlinear. To evaluate the pros and cons of the two analytical methods when dealing with nonlinear and complex data, a comparison was made, and the random forest algorithm was preferentially selected as the analytical tool to enhance the precision of the prediction model. Thus, this paper analyzes the correlation between logging parameters and the rock drillability grade value based on Pearson correlation analysis and the random forest algorithm. Using the Matlab programming language, logging parameter correlation analysis software named Correlation 1.0 was developed. The random forest algorithm was preferred to screen out logging parameters with high correlation to the drillability grade value (drilling depth and formation density), providing a new approach for establishing a high-precision formation rock drillability model.

关键词： drilling Analytical models Correlation Software algorithms rocks Prediction algorithms Mathematical models Software MATLAB random forests

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removing Water Blocking damage in HTHP Tight Gas reservoir Using Alternative Fracturing Fluid

Removing Water Blocking Damage in HTHP Tight Gas Reservoir U...

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2022 SPE Conference at Oman Petroleum and Energy Show, OPES 2022

作者： Liu, Huifeng Zhang, Jianli Liu, Jiangyu Yang, Zhanwei Chen, Tie Gu, Yixin Baletabieke, Bahedaer CNPC Engineering Technology R&D Company Limited China National Oil & Gas Exploration & Development Company China PetroChina Tarim Oilfield Company China Research Institute of Petroleum Exploration and Development PetroChina China

ISBN: (纸本)9781613997062

Tight gas reservoir is easily damaged by liquid phase because of the small pores and throats in the formation. Hydraulic fracturing is usually used in this kind of reservoir to improve well productivity;however, sometimes the productivity declines instead of increasing after treatments because of the damage of the water-based stimulation fluids. This paper introduces a production decline case in the HTHP tight gas reservoir in Tarim Basin, Western China, and provides a new solution. dixi gas reservoir belongs to the formation of Jurassic Ahe Group, with burial depth of about 5000m. The formation porosity is between 3.0-7.0%, and the permeability is less than 0.1md. The average dST production rates of three wells in this area were more than 30×104 m3/d. However, the production declined by 40% after completion. Acidizing and proppant fracturing were both conducted to regain their productivities;however, the production rates were reduced even further after the treatments. One of these wells’ daily production rate declined by 78% compared to dST production after use of acid fracturing and hydraulic fracturing. A series of core flow tests were carried out to find out the causes and solutions. The results showed that the retention of fracturing fluid in the formation caused "water blocking damage", which leaded to a significant increase of water saturation and rapid decline of gas phase permeability. This is considered the main cause of well productivity decline. Therefore, minimizing the capillary force in the formation is considered the main approach to remove the damage. Three series of alternative fracturing fluids were developed and evaluated. The first one is fracturing fluid with methanol. 5%-20% methanol was added to the fracturing fluid to relieve water blocking damage. The results showed that most of the wells fractured by methanol fracturing fluid gained good post-fracturing productivity. Fluorocarbon surfactant fracturing fluid was also developed, in which the

关键词： Fracturing fluids

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Twenty Years’ Offshore Polymer Flooding Field Tests and Practices in Shallow Sea 22

Twenty Years’ Offshore Polymer Flooding Field Tests and Pra...

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22nd European Symposium on Innovative and Optimised resource Utilisation, IOr+ 2023

作者： Guo, H. Wang, Z. Lyu, X. Liu, S. Liu, H. China University of Petroleum China SINOPEC Research Institute of Petroleum Engineering Co. China SINOPEC Northwest Oilfield Company China CNOOC EnerTech China CNPC Research Institute of Petroleum Exploration and Development China CNPC R&D DIFC China

ISBN: (纸本)9789462824881

due to the harsh reservoir conditions and environment as well as limited knowledge about the mechanisms, first polymer flooding field test in offshore reservoir in China was 7 years after the commercial application of polymer flooding in onshore reservoirs. The polymer flooding field test was gradually enlarged and expanded to six oilfields in Bohai. The water depth in Bohai oil fields were low. Among the six offshore polymer flooding projects, three were surfactants based (surfactant/polymer flooding). different from onshore polymer flooding field practices in China, the associative polymer (AP) was injected in two offshore reservoirs to meet the requirement of high polymer solution viscosity in high salinity sea water. Because of the hydrophobic monomer in molecular structure, the AP has much better salinity-resistance performance and produced higher solution viscosity than conventional polymer partially hydrolyzed polyacrylamide (HPAM). The molecular size of AP was also larger than that of HPAM which may affect its formation transportation. The polymer flooding performances were different in terms of incremental oil recovery factor (IOrF), injection pressure and produced fluids treatment. The limited space and processing time in offshore platforms constrained the selection of polymers and the injection schemes. The injection rate ( © IOr+ 2023 - 22nd European Symposium on Innovative and Optimised resource Utilisation.

关键词： Oil well flooding

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dynamic covalent carbon dot-based emulsifiers: A novel strategy for smart Pickering emulsions and enhanced heavy oil recovery in ultra-low permeability reservoirs

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Journal of Colloid and Interface Science 2025年 697卷 137935页

作者： Fan, Junjie Cui, Jianpeng He, Tinglei Zhang, Tianhao Yuan, Xinyu Hu, Jianwen Gao, Haotian Zhang, Hong Li, Chunling Hu, Songqing Sun, Shuangqing Shandong Qingdao266580 China Shandong Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

Carbon dots (Cds), a class of fluorescent nanomaterials distinguished by their unique properties such as tunable surface chemistry and nanoscale dimensions, have garnered significant attention. In this study, we synthesize Cds-based emulsifiers through a combination of hydrothermal synthesis and hydrophobic modification utilizing dynamic covalent imine bonds, imparting them with amphiphilicity and pH-responsiveness. These carbon dot-based emulsifiers stabilize the oil–water interface to form Pickering emulsions and enable the reversible regulation of amphiphilicity through pH-induced cleavage and reformation of imine bonds, thereby facilitating transitions between emulsification and demulsification. Furthermore, the amphiphilic Cds effectively reduce oil–water interfacial tension and exhibit potential application in mobilizing heavy oil in ultra-low permeability reservoirs. Consequently, we observed a 28.78 % decrease in injection pressure and an 18.65 % increase in recovery rates. Experimental and theoretical results reveal that the Cds adsorb onto both solid and oil phase surfaces, modulating the interfacial properties and enabling the oil film attached to the rock wall to be more easily stripped off during water flushing. Additionally, the small size of the Cds allowed them to enter finer pore throats and effectively displace the residual oil film. This unique characteristic holds significant promise for future advancements in the fields of smart-response Pickering emulsions and enhanced oil recovery in ultra-low permeability reservoirs. © 2025

关键词： Surface chemistry

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research on online correction method of dynamic ampacity parameters of submarine cable based on optical fiber temperature measurement 4

Research on online correction method of dynamic ampacity par...

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2024 4th International Conference on Optics and Communication technology, ICOCT 2024

作者： Li, Cunyi Zhang, Bo Hu, Peng Huo, Peng New Energy Engineering Technology Company Limited Beijing100034 China National Energy Wind Power Operation Technology R&D Center Xian710309 China

ISBN: (纸本)9781510685734

An on-line correction method for dynamic ampacity parameters of submarine cables based on optical fiber temperature measurement is proposed. First, through sensitivity analysis, find the material parameters that have a greater impact on the calculation of the current carrying capacity of IEC60853. Then, in the submarine cable real-time monitoring system, current data that meets certain characteristics and corresponding fiber temperature measurement data are extracted, and the conductor temperature is calculated by the thermal circuit method. Compared with the conductor temperature calculated by IEC60853, particle swarm optimization algorithm is used to modify the material parameters online, so as to reduce the error of IEC60853 in calculating the dynamic current carrying capacity. Finally, a 220KV three-core photovoltaic composite submarine cable from an offshore wind farm in Yancheng is taken as an example to verify the effectiveness of the method. © 2024 SPIE.

关键词： Sensitivity analysis

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A Construction Method of Complex Fractures in Marine Carbonate reservoir

A Construction Method of Complex Fractures in Marine Carbona...

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Offshore technology Conference, OTC 2022

作者： Wang, Wenzhi Yang, Guang Cui, Meng Wang, Haige Zhou, Zhou Kao, Jiawei Liu, Yuqing Wang, Lian CNPC Engineering Technology R&D Company Limited China China University of Petroleum Beijing China Sinopec Research Institute of Petroleum Engineering China CNOOC Research Institute Beijing China

ISBN: (纸本)9781613998526

Marine fractured-vuggy carbonate reservoirare important oil and gas reservoirs in China, the Middle East, and North America. In the development process, it is necessary to connect hydraulic fractures and as many karst cavities as possible, which are the main geological components of oil and gas storage. However, the systematic theoretical of how to build complex fractures in fractured-vuggy carbonate reservoirs is scarce. Facing this situation, this paper presents a method that can improve the accuracy of fracturing effect prediction and optimize fracturing process design parameters so as toachieve the purpose of increasing production. It studies the factors that could affect that connection. It is found that the density of natural fractures and cavitiesin the reservoir is the main factor affecting the fracture propagation shape. Meanwhile, the liquid containing cavitiesin the reservoir will attract or repel the fractures. Furthermore, natural fractures will cause the migration of fracture propagation path and hydraulic fractures are easy to continue to expand along the direction of large natural fractures. This methodology could be used in future studies for the marine fracture–vuggy carbonate formation. In addition, the research conclusion could be used to design and evaluate hydraulic fracturing operation. © 2022, Offshore technology Conference. All rights reserved.

关键词： Offshore oil well production

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