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13th International Field Exploration and development Conference, IFEdC 2023

作者： Chen, Xue-Feng Chen, Zhi-Xue Wen, Tao Li, Bo Zhai, Wen-Bao Wang, Zheng-Xu Jiang, Ji-Wei Guo, Xiao-Wei Liu, de-Zhi Tan, Peng CNPC Engineering Technology R&D Company Limited Beijing102206 China PetroChina Tarim Oilfield Company Xinjiang Korla841000 China

ISBN: (纸本)9789819702558

With the continuous deepening of exploration and development for Fuman oilfield, the existing casing program fails to effectively deal with downhole problems such as "overflow, leakage and collapse" caused by local high-pressure brine developed layer, leading to longer drilling time and higher drilling safety risk. Therefore, it is urgent to optimize the existing casing program according to the characteristics of geology and engineering to meet the requirements of safe drilling. For this purpose, the three types of pressure profiles in the Fuman oilfield are firstly established by using the drilling, logging, mud logging, and testing data, and the necessary setting points and risk points of geology and engineering are determined. Then, considering the level of drilling technology and the requirements of drilling and completion, the optimization and expansion scheme of casing program is formed. Finally, combined with the drilling parameters, the feasibility analysis of casing program in terms of casing string design, drilling tool strength verification, hydraulic simulation, well control risk assessment, drilling time and drilling cost is discussed. The analysis results show that the optimized casing program can effectively seal the local high-pressure brine developed layer, solve the problem of "overflow, lost circulation and collapse", reduce the downhole problems, and shorten the drilling time by 20 ~ 25 days and save 2 ~ 3 million per well. The investigates indicate that the optimization of the casing program not only effectively makes up for the shortcomings of the current casing program, reduces the drilling risk, and improves the drilling efficiency, but also provides an important reference for the drilling engineering design of the Fuman oilfield. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： risk assessment

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Case Studies of a Novel digital Twin System for real-Time Early Identification and Warning of Pipe Stuck

Case Studies of a Novel Digital Twin System for Real-Time Ea...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Zhang, Jiawei Wang, Qing Zou, Lingzhan Yu, Jingping Li, Jijun Yang, Yun Zhang, Yang Zhao, Zhixue CNPC Engineering Technology R&D Company Limited Beijing China CNPC Daqing Exploratory & Drilling Engineering Company Daqing China CNPC CCDC Drilling & Production Technology Research Institute Xi'an China Drilling Engineering Technology Research Institute of CNPC Daqing Drilling Engineering Company Daqing China

ISBN: (纸本)9781959025184

Pipe stuck serves as one of the primary downhole accidents in drilling industry with consequences ranging from minor inconvenience to severe complications. despite the variation on its cause and mechanism, this downhole accident could be prevented or avoided based on early identification of its unique symptom or data behavior, provided intervention or remediation measures are taken promptly. While conventional prediction or recognition methods, which rely on the fluctuation amplitude and curve trends of surface drilling parameters, are subject to user experience and human error, it's often the case that their timeliness cannot be guaranteed. A novel digital twin system, based on the deviation of hook load, torque and SPP (Standpipe Pressure) from theoretical modeled values and rOC (rate of Change) of these three actual parameters, is developed for real-time early identification and warning of pipe stuck while drilling. A PSrI (Pipe Stuck risk Index) ranging from 0%-100% is proposed based on rOC and deviation for comprehensive evaluation regardless of drilling state. Both T&d and wellbore hydraulics models are adopted to model the theoretical hook load, torque and SPP within preset computing cycle. rOC and deviation thresholds, corresponding to three different risk levels as low (green), medium(yellow) and high(red), were obtained by using rFA (random Forest Algorithm) based on data of historical wells with and without pipe stuck accidents. Preventive or intervention measures are generally mandatory for on-site personnels or engineers once high-risk (red) alert is identified by the system. Several case studies are outlined to exhibit that the occurrence of pipe stuck accidents could be detected typically between 30 minutes and 2 hours ahead during back-reaming and tripping operations, which proved its potential for early identification and prevention of this downhole accident in real-time drilling. Cost containment and operational efficiency could be created with sys

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development and Performance Evaluation of Environment-Friendly Self-degradable Polymer Film Workover Fluid System 13th

Development and Performance Evaluation of Environment-Friend...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Liu, Jian-Quan Gao, Xiang Xing, Li-Jie Ye, Zhi-Lin Jin, Yi Wang, Zhen-Yuan CNPC Engineering Technology R&D Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Jidong Oilfield Company Tangshan China

ISBN: (纸本)9789819702558

At present, the chelating acid fluid and Prd drilling fluid in the period of well drilling and completion are still applied as the workover fluid in Weizhou Oilfield. Leakage often occurs due to the insufficient plugging ability of chelating acid workover fluid, which will not only lead to the waste of workover fluid but also cause reservoir damage and low oil and gas production. After Prd drilling and workover, it is difficult to break the gel, resulting in plugging and the sharp drop of oil output. The test shows that the lower pay zone has no output, which causes great economic losses and brings great difficulties to the exploitation of oil and gas resources. Aiming at the problems of insufficient plugging performance, poor reservoir protection performance, difficulty in self-plugging removal, and environmental protection of the existing workover fluid system in Weizhou Oilfield, an environment-friendly self-degradable polymer film workover fluid system was developed, and the formula was seawater + 1% dristemp + 3% film-forming agent + 2% bionic inhibitor + 3% super-amphiphobic agent. The system has high temperature stability, good pressure-bearing and plugging performance and water blocking resistance, and can effectively protect the reservoir. In addition, through the environmental protection performance test, it is determined that the formula has excellent characteristics of safety, non-toxicity, and no environmental pollution. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Chelation

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The development and Laboratory Evaluation of Biodiesel Lubricant Bd-1 for drilling Fluid 13th

The Development and Laboratory Evaluation of Biodiesel Lubri...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhang, Kui Nie, Jie-Jing Fang, Ye-Xin CNPC Engineering Technology R&D Company Limited Beijing102206 China Beijing Petroleum Machinery Co. DRI of CNPC Beijing100083 China

ISBN: (纸本)9789819702558

In order to develop efficient, low-fluorescence, biodegradable lubricant for water based drilling fluid, biodiesel is used to compound Bd-1 lubricant. Lubrication mechanism is analysed in the process of drilling. The formula of compounded lubricant Bd-1 is got by optimizing experiment of emulsifier, extreme-pressure lubricant, and solid lubricant. Laboratory evaluation results show that Bd-1 lubricant is of no flsorescence, good lubricity in base mud and weighted drilling fluid, salt resistance, compatibility with drilling fluid, heat resistance and biodegradability. Bd-1 lubricant is up to the requirement of Q/SY17088-2016. The decreasing rate of extreme pressure lubricating factor is above 90%, which is as low as 0.02 when 2%Bd-1 is under the condition of 160 ℃. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Emulsification

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Intelligent Optimization of drilling Parameters Based on Multiple drilling Agents

Intelligent Optimization of Drilling Parameters Based on Mul...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Pei, Zhijun Song, Xianzhi Hu, Zhijian Pan, Tao School of Petroleum Engineering China University of Petroleum Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025184

drilling parameter optimization is one of the important ways to improve drilling efficiency and reduce drilling cost. Multi objective intelligent optimization technology has the characteristics of comprehensive consideration of factors and fast solution speed, and is suitable for drilling parameter optimization scenarios. Based on the drilling data of a vertical well in Tarim Oilfield, the rate of penetration (rOP) prediction agent, pipe string friction calculation agent and bottom hole cleanliness agent are established by using artificial intelligence or mechanism methods. Based on non-dominated sorting genetic algorithm II(NSGA-II), several established drilling agents are combined, and intelligent optimization model of drilling parameters is established. The evaluation function of the drilling scheme is set up to select the optimal drilling parameter optimization scheme from numerous Pareto solutions under the condition of ensuring operation safety, and the scheme is applied and verified in this well for Kangcun Formation and Jidik Formation with low rOP. According to the optimization results of drilling parameters, under the condition of ensuring the bottom hole cleaning and normal drilling, compared with the previous drilling plan, the rOP of Kangcun formation is increased from 3.43m/h to 7.72m/h;The rOP of Jidik formation is increased from 4.76m/h to 8.84m/h. The rOP of the two formations has been increased by 125.1% and 85.7% respectively, which can shorten the drilling cycle and reduce the drilling cost to a certain extent. Copyright © 2024, International Petroleum technology Conference.

关键词： drilling Agent drilling parameter optimization NSGA-II

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development of Intelligent Testing and Evaluation System for Fracturing Pump

Development of Intelligent Testing and Evaluation System for...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Chen, Bing-deng Jin, Ling Zhang, Na Zhou, Zhi-Xiong Han, Xing Bai, Han-Qin CNPC Engineering Technology R&D Company Limited Beijing China Beijing Kembl Petroleum Technology Co.Ltd Beijing China

Fracturing truck is the key technical equipment for oil and gas production stimulation. Fracturing pump of fracturing truck is subjected to high pressure load for a long time during use. due to the influence of many factors such as transportation and equipment aging, the performance of fracturing pump in field use is reduced and the output power is insufficient. In order to realize the on-site inspection of fracturing pump, a set of intelligent inspection and evaluation system of fracturing pump is developed. Through the establishment of the hardware test platform and the development of the software system, the intelligent inspection and evaluation system of fracturing pump with the features of one-click automatic detection, automatic analysis of performance indicators, intelligent prediction and maintenance of health status is realized. The system can support the static pressure test, water power test and overpressure protection test of 140MPa ultra-high pressure fracturing pump. Experimental tests show that the test accuracy of the equipment can effectively meet the detection and evaluation needs of the field fracturing truck, ensure the normal function through static pressure and water power detection, and determine the safety of the equipment through overpressure protection detection, which greatly improves the effect and efficiency of fracturing operations. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Oil field equipment

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Carbon nanotube enhanced water-based drilling fluid for high temperature and high salinity deep resource development

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Petroleum Science 2022年第2期19卷 916-926页

作者： Jing-Ping Liu Xian-Fa Zhang Wen-Chao Zhang Kai-He Lv Yin-rui Bai Jin-Tang Wang Xian-Bin Huang Jia-Feng Jin Jin-Sheng Sun College of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China CNPC Engineering Technology R&D Company Limited Beijing 102206China

drilling fluids face failure during drilling deep reservoir with high temperature and high *** experimental results show that high temperature and salinity reduce the negative charge on the surface of bentonite in the drilling fluid and cause the coalescence of bentonite *** a result,the particles coalesce,the grid structure is destroyed,and the rheological properties,rock-carrying capacity and filtration properties are *** resolve the foregoing,in this study,0.05-wt%carbon nanotubes are introduced into a 4%bentonite drilling fluid under conditions where the temperature and concentration of added Na Cl reach 180°C and 10 wt%,*** carbon nanotubes adsorb on the bentonite surface and increase the space among bentonite *** steric hindrance prevents the coalescence of bentonite in high temperature and high salt *** bentonite maintains the small size distribution of bentonite and supports the bentonite grid structure in the drilling *** a result,the rock-carrying capacity of the drilling fluid increases by 85.1%.Moreover,the mud cake formed by the accumulation of small-sized bentonite particles is dense;consequently,the filtration of bentonite drilling fluid reduced by 30.2%.

关键词： High temperature Water-based drilling fluid High salinity Carbon nanotube deep resources

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research on drilling Technologies of Ultra-Thick Salt domes in Middle Asia and Pre-Salt Strata in Middle East: Lessons Learnt from a Pilot Well in Kenkyak Oilfield and an HPHT Well in Halfaya Oilfield

Research on Drilling Technologies of Ultra-Thick Salt Domes ...

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2023 Offshore technology Conference Brasil, OTCB 2023

作者： Jin, Fu Wanting, Jia Longlian, Cui Guobin, Yang Chen, Chen CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781959025023

Pre-salt strata are more and more common in recent years, challenging the petroleum industry. The reservoir in Kenkyak Oilfield (Kazakhstan) is found in deep formation beneath the ultra-thick salt dome, which brings lots of challenges such as mud loss, well kick, pipe-sticking, borehole caving, low rOP and so on. As for Halfaya Oilfield in Iraq, HF-10 is expected to be drilled as the first vertical exploration well in the region, targeting Baluti/Kurra Chine, but the complicated multiple pressure regime, cross-bedded high-pressure and low-pressure formations has been challenging the operator for decades, especially the two high-pressure formations above Yamama, one is the Lower Fars layer featured by salt-gypsum and a high pore pressure coefficient. How to safety and efficiently penetrate pre-salt strata and ultra-thick salt domes are rather important issues. Logging data of all wells that had been drilled previously in the region were studied to analyze causes of low rOPs and downhole complexities of all kinds. A pilot well was drilled in Kenkyak Oilfield and optimized drilling technologies were applied on it, so as to make a comparison between it and adjacent wells. rock cores in the salt-gypsum formation were collected to analyze its creep deformation law on a basis of rock mechanics and establish the creep deformation formula. Important findings have been analyzed, in order to deal with the similar scenarios in Iraq. The upper Mesozoic formation contains sandstones and intercalated mudstones with ooze, which increases permeability and hydration grade. However, problems such as mud loss, borehole collapsing and bit ball-up always happen. Shallow secondary gas with a limited volume and high pressure was drilled in the pilot well in Kenkyak Oilfield. The polymeric mud system and integrated solid control devices were used for the large diameter borehole to deal with mudstone hydration. In the Permian ultra-thick salt dome salt and gypsum dissolve to cause borehole c

关键词： Boreholes

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Comprehensive Evaluation of a Novel recrosslinkable Preformed Particle Gel for CO2 Sweep Efficiency and Storage Improvement 84

Comprehensive Evaluation of a Novel Recrosslinkable Preforme...

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84th EAGE Annual Conference and Exhibition

作者： Bai, B. Long, Y. Al Brahim, A. Missouri University of Science and Technology United States CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781713884156

To overcome the inherent inferiors of pristine particle gel and in-situ polymer gels, such as the extrusion, dehydration, mechanical vulnerability and thereof defects, a new class of particle gels that can recrosslink at subterranean conditions, wherein maintaining stable in supercritical CO2, is described in this work. The newly developed particle gel is called CO2 resistant re-crosslinked preformed particle gel (CO2-rPPG). After being placed into target zone, the particles accumulate in the fractures or conduits and then self-recrosslink into a rubber-like bulk gel, which can block the target zone or bypassing zone, and thereby divert the chased fluid (e.g., CO2 or water) to the unswept zone. Therefore, the CO2-rPPG can be used to plug the preferential fluid flow channels in CO2 injection reservoirs and thus improve CO2 sweep efficiency and storage efficiency. In this paper, we will provide a comprehensive evaluation for the novel particle gel to tell where if it can used for CO2 flooding and storage projects for better plugging efficiency. results show the novel polymer particle gel provides a novel and cost-effective tool to control CO2 injection performance, improve sweep efficiency and storage efficiency for CO2 storage and EOr projects. © 2023 84th EAGE Annual Conference and Exhibition. All rights reserved.

关键词： Carbon dioxide

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A Novel Methodology to Improve Wellbore Integrity via reliable Barriers: Integration of remote Wireless Zonal Water Injection and Intelligent Water Control

A Novel Methodology to Improve Wellbore Integrity via Reliab...

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2023 Offshore technology Conference Brasil, OTCB 2023

作者： Jin, Fu Longlian, Cui Bingshan, Liu Guobin, Zhang Chen, Chen CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781959025023

More and more deep horizontal wells have been drilled over all the world, strata with much higher temperature are discovered, which increases the risk to wellbore integrity and has driven the evolution of zonal isolation methods. New methods aim to ensure that the completion equipment deployed by operating companies can guarantee the integrity of oil wells throughout their entire lifecycle. Several globally renowned oilfield service companies are actively developing mechanical, fluid activation, and chemical solutions to address the increasingly challenging downhole conditions. Meanwhile, the industry is increasingly recognizing the importance of employing precise water injection and water control technologies to enhance wellbore integrity of oil and gas producers. As oil and gas fields reach a certain stage of development, the heterogeneity between layers becomes more prominent, leading to interlayer conflicts. due to significant variations in geological characteristics among strata, which affect the degree of water flooding control in practice, it is necessary to implement zonal water injection techniques. Wireless intelligent water distributors utilize pressure or flow fluctuations to transmit signals, enabling control of the opening of downhole water distributors to adjust injection rates. The digital data transmission eliminates the need for human intervention, greatly reducing operational costs and saving time and effort. Compared to conventional water distributors, these instruments demonstrate higher efficiency and accuracy in intelligent zonal water injection. They perform regular tests on the flow rates of each individual layer, allowing for a better understanding of water absorption conditions and pressure variations across the well. This achievement aligns with the goal of achieving sufficient and proper water injection for waterflooding development, thereby enhancing the effectiveness of water injection and facilitating precision waterflooding in oilfie

关键词： Oil field equipment

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