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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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An experimental study on horizontal well waterflooding in the Cretaceous porous carbonate reservoir of Oman

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Energy Geoscience 2024年第3期5卷 85-92页

作者： Jie Chen Liang Cheng Song Jin Yongli Wang Leiting Shi Geological Exploration and Development Research Institute Chuanqing Drilling Engineering Company LimitedCNPCChengdu 610051China International Nature Gas Technology Support Center CNPCChengdu 610051China Oman Project Company CNPCBeijing 100034China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Porous carbonate reservoirs,prevalent in the Middle East,are lithologically dominated by bioclastic limestones,exhibiting high porosity,low permeability,intricate pore structure,and strong *** through horizontal wells is commonly used for exploiting these ***,challenges persist,such as significant uncertainty and complex operational procedures regarding adjustment effects during the *** USH reservoir of the Cretaceous D oilfield,Oman exemplifies typical porous carbonate *** initially underwent depletion drive using vertical wells,followed by horizontal well waterflooding in the late ***,the oilfield is confronted with substantial developmental challenges,involving the understanding of residual oil distribution,effective water cut control,and sustaining oil production since it has entered the late development *** a microscopic visualization displacement system equipped with electrodes,this study elucidated the waterflooding mechanisms and residual oil distribution in the late-stage development of the USH *** results reveal that the reservoir's vertical stacking patterns act as the main factor affecting the horizontal well waterflooding *** water flow channels emerge under varying reservoir stacking patterns,with post-waterflooding residual oil predominantly distributed at the reservoir's top and *** oil recovery can be enhanced by adjusting the waterflooding's flow line and *** findings of this study will provide theoretical insights of waterflooding mechanisms and injection-production adjustments for exploiting other porous carbonate reservoirs in the Middle East through horizontal wells.

关键词： Porous carbonate reservoir Horizontal well waterflooding Microscopic visualization Three-dimensional physical model Waterflooding characteristics

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Design and Application of Downhole Drilling Mud Pulse Signal Transmission System 3

Design and Application of Downhole Drilling Mud Pulse Signal...

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2023 3rd International Conference on Mechatronics, Automation and Intelligent Control, MAIC 2023

作者： Zhang, Lei Chen, Gang Li, Changkun Xu, Changlong Xia, Hongyun Engineering Technology Research Institute CNPC Xibu Drilling Engineering Company Limited China Zhundong Drilling Company CNPC Xibu Drilling Engineering Company Limited China Karamay Drilling Company CNPC Xibu Drilling Engineering Company Limited China

Time-efficient measurement of undisturbed formation through measurement while drilling technology is an effective means to improve drilling efficiency in deep formations and increase the drilling-encounter ratio of reservoirs. Based on the application and development trend of existing downhole signal transmission technology, a pulse signal transmission system of downhole mud while drilling is designed. The system pulse generation device adopts the structure of a positive pulse generator, which is through the internal driving circuit and hydraulic circuit of the device to drive the valve head to move to generate a mud pulse signal while using the design of a limit switch to optimize the expansion spacing of the valve head so that the generated pulse signal amplitude is close. The system uses combined encoding as the encoding method, while the ground part of the system is designed to monitor and process the collected signals. Finally, the transmission capability and accuracy of the system are tested through field experiments, and the field results show that the system can work smoothly in the downhole environment to transmit downhole data to the wellhead with small errors, which meets the design requirements and field requirements. The field applications are carried out in several wells, such as the Shixi 105 well. The results show that the system has good downhole pulse signal transmission functions such as borehole inclination measurement, which helps to promote the development of existing drilling measurement technology. © Published under licence by IOP Publishing Ltd.

关键词： Signal encoding

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Flow field and erosion characteristics of the valve head of a vertical well inclinometer 6

Flow field and erosion characteristics of the valve head of ...

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6th International Conference on Mechanical, Electrical and Material Application, MEMA 2023

作者： Wang, Xindong Li, Fuqiang Zhang, Lei Zhou, Lei Huang, Haoping Engineering Technology Research Institute Cnpc Xibu Drilling Engineering Company Limited China Zhundong Drilling Company Cnpc Xibu Drilling Engineering Company Limited China Karamay Drilling Company Cnpc Xibu Drilling Engineering Company Limited. China

During the drilling, the flow field characteristics of the vertical well inclinometer are complex. In a harsh underground environment, the valve head is prone to erode and wear. To overcome these disadvantages, the three-dimensional (3D) model of the valve head of a vertical well inclinometer was developed, and the flow field and erosion characteristics were simulated by using a numerical program. Results show that the maximum velocity and the maximum turbulence effect occur at the throttling inlet through which the drilling fluid passes the guide sleeve. By analyzing the particle trajectory of the discrete phase model, it is found that the particles above the valve head surface have obvious accumulation and rebound phenomena and that the erosion effect appears to some extent on the valve head surface. Analysis of the shear stress on the surface of the valve head shows that the stress concentration occurs in the valve head directly impacted by the drilling fluid and in the groove of the flow drilling fluid, respectively. The feasibility and accuracy of the simulation are verified by comparing the theoretical results with that of the field test. This investigation can be used to explain the failure of the valve head of the vertical well inclinometer and provide the design and optimization of the valve head with scientific support. © Published under licence by IOP Publishing Ltd.

关键词： Drilling fluids

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Study on Fracture Propagation in Tight Sandstone by Large-Scale Physical Simulation Experiments 12th

Study on Fracture Propagation in Tight Sandstone by Large-Sc...

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12th International Field Exploration and development Conference, IFEDC 2022

作者： Li, Jia-Ying Qi, Chun-Yan Wu, Bo-Hong Gu, Ye Zhou, Tuo CNPC Engineering Technology R&D Company Limited Beijing China CNPC Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789819919635

Physical simulation experiment on hydraulic fracturing is an effective and reliablemethod to understand the initiation and propagation of hydraulic fractures. However, shale and cement samples are mostly used in current experiments, while tight sandstone is seldom studied. Besides, the experiments are usually conducted with single-stage fracturing, ignoring the interaction between fractures in the actual fracturing. In this paper, a pioneer large-scale physical simulation experiment is conducted by multi-stage hydraulic fracturing to reveal the initiation and propagation of fracture in tight sandstone. Two groups of tight sandstone samples were prepared as the size of 28 × 28 ×36,where four circular notches were designed on the wellbore to represent fracturing clusters. The tests were performed by a large block polyaxial stress frame and the acoustic emissions data were observed to indicate the features of fracture complexity. Consequently, the effects of hydraulic fracture interaction, pumping rate and rate pulsing on fracture propagation were studied. The results showed that the simple fractures were mainly formed in tight sandstone, while the complex fractures were rarely formed since the mutual inhibition between fractures under stress shadow. The fracture initiation and breakdown pressures increase gradually with the pump rate, while the rate change has no significant effect on the fracture radius. The rate pumping can effectively increase fracture complexity, further improving the effect of reservoir stimulation. This work successfully reveals the effects of different factors on fracture initiation and propagation, offers an innovative method of physical simulation experiment on hydraulic fracturing, and provides a significant reference for fracturing design optimization of tight sandstone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Fracture

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Application status and prospect of ionic liquids in oilfield chemistry

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Petroleum 2024年第1期10卷 11-18页

作者： Jinsheng Sun Zhuoyang Xiu Li Li Kaihe Lv Xianfa Zhang Zonglun Wang Zhiwen Dai Zhe Xu Ning Huang Jingping Liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

The ionic liquid,as a new treatment agent,has been increasingly applied in oil fields due to its strong temperature resistance,good solubility and high surface *** this paper,we systematically discuss the action mechanism and application effect of ionic liquids in oilfield *** liquids can inhibit shale hydration expansion and reduce fluid loss through adsorption and intercalation,inhibit the formation of natural gas hydrate through imidazole five-membered ring structure as a space barrier,reduce viscosity of heavy oil by breaking chemical bonds of heavy oil macromolecules and charge transfer,improve oil displacement efficiency by forming ions pairs with carboxyl groups in crude oil,demulsify by forming channels between dispersed water droplets,acidify the formation by reacting with water to produce acid,interacts with organic material through weak hydrogen bonds and extracts it from oilfield wastewater,desulphurize by inserting sulfide molecules into the“stack”structure and form liquid inclusion complex,inhibit corrosion by forming a protective film on the metal *** on the above aspects,the development direction of ionic liquids is *** application of ionic liquids in oilfield chemistry is still in its *** is urgent to fully explore the application performance of ionic liquids in oilfield chemistry,which also provides theoretical and technical supports for efficient reservoir development.

关键词： Ionic liquids Oilfield chemistry Shale inhibitor Drilling fluid

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Natural rubber latex as a potential additive for water-based drilling fluids

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Petroleum Science 2024年第4期21卷 2677-2687页

作者： Jun Yang Guan-Cheng Jiang Jing-Tian Yi Yin-Bo He Li-Li Yang Teng-Fei Dong Guo-Shuai Wang College of Petroleum Engineering China University of Petroleum(Beijing)Beijing 102249China National Engineering Research Center of Oil&Gas Drilling and Completion Technology Beijing 102249China Changqing Drilling General Company CNPC Chuanqing Drilling Engineering Company LimitedXi'an 710021ShaanxiChina

The environmental hazards and"carbon footprint"of oil and gas drilling can be significantly reduced by replacing traditional petroleum-based chemical additives with natural materials derived from plants and *** paper explored for the first time the interaction mechanism between natural rubber latex(NRL)and bentonite suspensions(BTs)through a series of characterization experiments,as well as the potential applications in water-based drilling fluids(WBDF).The gel viscoelasticity experiments showed that NRL could decrease the consistency coefficient(k)and flow index(n)of BTs,and enhance the shear thinning performance of BTs as pseudo-plastic *** addition,0.5 w/v%NRL not only increased the critical yield stress and strengthened the structural strength between the bentonite particles,but also facilitated the compatibility of pressure loss and flow *** evaluation of colloidal stability and WBDF performance indicated that NRL particles could promote the hydration and charge stability on the surface of BTs particles,and optimize the particle size distribution and flow resistance of WBDF under the"intercalation-exfoliation-encapsulation"synergistic ***,NRL can improve the rheological properties of WBDF at high temperatures(<150.C),and form a dense blocking layer by bridging and sealing the pores and cracks of the filter cake,which ultimately reduces the permeability of the cake and the filtration loss of WBDF.

关键词： Natural materials Water-based drilling fluids Natural rubber latex Bentonite suspensions Filtration loss

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Application of 4D Geomechanical in Fault Sealing Capacity Evaluation of Underground Gas Storage-A Case Study from China

Application of 4D Geomechanical in Fault Sealing Capacity Ev...

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2024 Offshore technology Conference Asia, OTCA 2024

作者： Huang, Xingning Wang, Mengcong Guo, Xuhong Xu, Miao Long, Xuechen Downhole Service Company of Xibu Drilling Engineering Company Limited Xinjiang Karamay China Geological Exploration & Development Research Institute CNPC Chuanqing Drilling Engineering Company Limited Sichuan Chengdu China

ISBN: (纸本)9781959025030

During the high-speed injection and extraction cycle of an underground gas storage reservoir, the pool's pore pressure, effective stress, and faults change periodically, which may cause formation damage and natural gas leakage, thus affecting the sealing of the entire reservoir. At the same time, the non-homogeneity easily causes local pressure accumulation, which makes the pore pressure and effective stress distribution extremely unbalanced, and the local pressure accumulation in the formation is a potential threat to the operation of the gas storage reservoir. At the same time, clarifying the fault stress field evolution can provide theoretical support for raising the upper limit pressure at a later stage. Therefore, the study of four-dimensional stress field evolution characteristics of the gas storage reservoir geologic body is directly related to the safe operation and efficient use of the gas storage reservoir. This paper investigates the evolution characteristics of fault stress fields in light of the characteristics of multi-cycle high-flow injection and extraction cycles in gas storage reservoirs. In this paper, numerical simulation is used to analyze the factors affecting the integrity of the fault. At the same time, gas-water two-phase seepage and flow-solid coupling principles are used to analyze the seepage mechanics and geomechanics of the conceptual model by combining with the integrated software of geoengineering. According to the simulation results, the pressure and stress fields with time and space changes and distribution characteristics were carried out, and the destructive prediction was carried out to find the submerged destabilized parts. A large-scale seepage-stress coupling field model was established based on the field data, and the model's accuracy was verified by simulation. Finally, seepage mechanics and geomechanical analysis were carried out for the actual model, and the results can provide theoretical support for the construction of t

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A New Method of Kick Evaluation Based on Energy Analysis

A New Method of Kick Evaluation Based on Energy Analysis

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2023 SPE/IADC Middle East Drilling technology Conference and Exhibition, MEDT 2023

作者： Ye, Yuguang Fan, Honghai Liu, Yuhan Tao, Zhenyu Diao, Haoyu Zhou, Fei China University of Petroleum-Beijing Beijing China CNPC Engineering Technology Research and Development Company Limited Beijing China

ISBN: (纸本)9781613999974

With the gradual progress of drilling to the deep layer, the formation conditions become more and more complex. The safe density window of drilling fluid is narrow, and well kick and overflow occur frequently. Aiming at this problem, this paper proposes an overflow evaluation index - overflow formation energy. From the perspective of energy analysis, overflow is regarded as the process of formation fluid doing work on the wellbore, and the power of overflow work can reflect the strength of overflow, so this power is defined as the overflow formation energy. Based on the model established in this paper, the effects of different types of overflow fluid, invasion rate of overflow fluid, drilling fluid density and formation pressure coefficient on overflow formation energy are analyzed. The overflow formation energy of gas is the highest. As the invasion rate of overflow fluid increases, the energy of overflow formation gradually increases. The data of 7 overflow wells are analyzed, and the corresponding overflow formation energy is calculated. It is found that the throttling circulating well killing method is more appropriate when the overflow formation energy is small. The overflow formation energy can quickly evaluate the overflow situation, provide theoretical basis for well control operation, and reduce the probability of well control operation risk. Copyright 2023, SPE/IADC Middle East Drilling technology Conference and Exhibition.

关键词： Drilling fluids

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Progress in the application of graphene material in oilfield chemistry:A review

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Petroleum 2024年第2期10卷 175-190页

作者： Jinsheng Sun Yuanwei Sun Yong Lai Li Li Gang Yang Kaihe Lv Taifeng Zhang Xianfa Zhang Zonglun Wang Zhe Xu Zhiwen Dai Jingping Liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Nanchong Vocational and Technical College Nanchong637131China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China CNPC Greatwall Drilling Fluids Company Panjin124000China

Graphene is a single atom thick crystal composed of carbon *** is the lightest,thinnest,strongest material that conducts heat and electricity well *** terms of application,by introducing oxygen-containing groups,graphene can be well dispersed in solvents,can be chemically modified and functionalized,or connected with other electroactive substances through covalent bond or non-covalent bond to form composite materials,which is conducive to further processing and *** application of graphene in oilfield chemistry started late,but developed *** has played an active role in drilling fluid,cementing fluid,fracturing fluid,displacement fluid and other oilfield working *** can enhance the temperature and salt resistance of working fluid and improve the effect of working *** this paper,several directions of graphene applications in oilfield chemistry,such as modified graphene,graphene copolymers and graphene nanoparticles,are reviewed in detail from the synthesis methods,action mechanisms and effects of graphene and its derivatives,and the frontier cases at this stage are *** the basis of the existing research,suggestions for the development direction of graphene materials in oilfield chemistry are given for a variety of graphene materials,aiming to provide guidance for the application of graphene in oilfield chemistry.

关键词： Oilfield chemistry Graphene Action mechanism Application Prospect

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