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Prediction of Horizontal and Vertical distribution Trend of Formation Pressure and Characteristics of Safety density Window in Yinggehai Basin 29th

Prediction of Horizontal and Vertical Distribution Trend of ...

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29th International Conference on Computational and Experimental engineering and Sciences, ICCES 2023

作者： Gao, reyu Cui, Yi Fan, Jinzhao Yang, Guang Yang, Hongwei CNPC Engineering Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9783031429866

The formation pressure system of Yinggehai Basin has the characteristics of poor horizontal distribution regularity and severe vertical distribution changes. This paper proposes a new method for predicting the horizontal and vertical distribution trend of formation pressure for the situation of limited offshore drilling data. The method is based on the topological triangulation algorithm, combined with the data set to fit the multivariate interpolation function, and conveniently realizes the prediction and visualization of the three-dimensional horizontal and vertical distribution trend of regional formation pressure. On this basis, through the analysis of the relevant data of the complex accident points that have been drilled, the characteristics of the single well safety density window and the regional safety density window are clarified. The study found that there is no high pressure in the shallow layer of the block, and the formation pressure spreads smoothly in the lateral direction;the high pressure top surface is at 3500 m, and the formation pressure gradually increases with the increase in longitude and decrease in latitude in the lateral direction. The formation pressure rises extremely rapidly with the increase of depth in the longitudinal direction, which has the characteristic of "broken line pressurization". The safety density window of single well is in the shape of funnel with the characteristic of turning back, and the turning section is between 3500 and 4000 m. The safety density window feature of the block can be divided into three stages according to the depth, and the window appears extremely narrow after 3500 m (3). © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Forecasting

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AdLM-LWd: Adaptive deep Learning Model for Lithology Identification from Logging- While-drilling data with Online Learning Mechanism

ADLM-LWD: Adaptive Deep Learning Model for Lithology Identif...

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2024 International Conference on New Trends in Computational Intelligence, NTCI 2024

作者： Zhao, Ziyun Lin, Wang Jing, Lingzhi Tian, Yumeng Guo, Weihong CNPC Engineering and Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9798331517021

Accurate lithology identification from Logging-While-drilling (LWd) data is crucial for optimizing drilling operations and enhancing reservoir characterization in the oil and gas industry. However, the lack of standardized datasets and the need for real-time adaptability in varying geological environments pose significant challenges. This study addresses these issues through three key contributions. First, a comprehensive dataset for lithology identification is constructed, combining LWd features with corresponding lithology labels, providing a valuable resource for deep learning applications in this field. Second, a novel deep learning model is proposed, integrating 2d convolution and bidirectional LSTM to effectively capture both spatial and temporal features of LWd data. The model demonstrates high stability and performance across various metrics in extensive cross-validation tests. Lastly, an Adaptive Incremental Learning Algorithm (AILA) is introduced, incorporating online learning mechanisms and dynamic adaptation strategies to enhance the model's real-time adaptability. These advancements contribute to more accurate and adaptive lithology identification systems, which potentially improve real-time decision-making in drilling operations and lead to more efficient and cost-effective exploration and production processes. © 2024 IEEE.

关键词： Gas industry

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Collision Mechanism of Marine drilling riser and Internal String in deep-water drilling 34th

Collision Mechanism of Marine Drilling Riser and Internal St...

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34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Zhang, Minghe Cui, Longlian Wang, Haige Yang, Jin Yang, Guobin Zhang, Guobin Liu, Qi Kong, Lulin Sun, Ke Jia, Wanting CNPC Engineering Technology R&D Company Limited China Beijing China

ISBN: (纸本)9781880653784

due to the complex marine environment loads, large horizontal deflection of marine risers, and contact and collision between risers and internal pipe strings will occur during drilling string installation and drilling process, resulting in drilling string wear and deformation, which brings great challenges to deep-water drilling. Based on the pipe-in-pipe model, the static analysis model of the whole process of contact and collision between riser and internal drilling string is established, and the contact modes of riser and internal drilling string are classified. The sensitivity analysis of key mechanical parameters, such as water depth, platform offset, environmental loads, and riser top tension was also carried out. The numerical simulation method is used to show the contact and collision between risers and internal pipe strings, and the control method for risers and internal string collision under different water depth conditions is proposed. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Marine risers

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Application of Integrated directional and Guide drilling technology in deep Coalbed Methane 7

Application of Integrated Directional and Guide Drilling Tec...

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7th International Conference on downhole Measurement and Control, ICdMC 2024

作者： Zhu, Weixing Wang, Zhuang Wu, dong Lin, Wang Wang, Yaxuan Huang, Kai He, Jiayu Xue, Hongzhi CNPC Engineering Technology R&D Company Limited Beijing102206 China

deep coalbed methane is characterized by deep burial, complex and diverse microstructures, significant lateral variations in reservoirs, and the development of internal interlayers. Current seismic exploration methods suffer from severe high-frequency signal attenuation in coal layers, resulting in low seismic resolution, which severely limits the precision of geological models for coalbed methane and the encounter rate of reservoirs in horizontal wells. Based on this, this paper introduces an integrated directional and guide drilling technology and applies it to horizontal well operation, achieving excellent results. Firstly, in the pre-drilling phase, we utilize well-seismic integrated reservoir and structural prediction techniques to meticulously characterize coal seam distribution patterns and subtle geological structures. This enables the construction of a geo-steering model specifically for horizontal wells, optimizing the locations of target points, designing well trajectories, and selecting the optimal configuration of geological steering tools. Secondly, in the drilling operation stage, this system iteratively refines the depth-domain seismic section based on real-time measure while drilling (for short MWd). This process reconstructs the geological steering model, precisely predicts the position of coal seams at the bottom of the well, continuously optimizes the well trajectory design in real-time, and ultimately generates geo-steering instructions. Finally, after the completion of drilling operations, the system evaluates the coal seam area and iteratively refines the three-dimensional geological model. This process provides technical support for the deployment of the next well and the design of the target trajectory. After verification through multiple horizontal wells targeting deep coalbed methane, the guiding model reconstructed by this technology has achieved a fitting rate of over 95%, significantly enhancing the reservoir encounter rate to above 90%

关键词： Horizontal wells

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Synthesis and mechanism of environmentally friendly high temperature and high salt resistant lubricants

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Petroleum Science 2023年第5期20卷 3110-3118页

作者： Zong-Lun Wang Jin-Sheng Sun Jing-Ping Liu Kai-He Lv Zi-Hua Shao Xian-Fa Zhang Zhe Xu Zhi-Wen dai Ning Huang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing 102206China

With the exploration and development of deep and ultra-deep oil and gas,high torque and high friction during the drilling of deep and ultra-deep wells become one of the key issues affecting drilling safety and drilling ***,the high temperature and high salt problem in deep formations is prominent,which poses a major challenge to the lubricity of drilling fluids under high temperature and high *** paper reports an organic borate ester SOP as an environmentally friendly drilling fluid *** performance evaluation results show that when 1%lubricant SOP is added to the fresh water-based mud,the lubrication coefficient decreases from 0.631 to 0.046,and the reduction rate of lubrication coefficient is 92.7%.Under the conditions of 210℃ and 30%NaCl,the reduction rate of lubricating coefficient of the base slurry with 1%SOP was still remain 81.5%.After adding 1%SOP,the wear volume decreased by 94.11%compared with the base *** contact resistance experiment during the friction process shows that SOP can form a thick adsorption film on the friction surface under high temperature and high salt conditions,thus effectively reducing the friction *** dynamics simulation shows that lubricant SOP can be physically adsorbed on the surface of drilling tool and borehole wall through hydrogen bond and van der Waals *** analysis further shows that SOP adsorbs on the friction surface and reacts with metal atoms on the friction surface to form a chemically reactive ***,under high temperature and high salt conditions,the synergistic effect of physical adsorption film and chemical reaction film effectively reduces the frictional resistance and wear of the friction *** addition,SOP is non-toxic and easy to ***,SOP is a highly effective and environmentally friendly lubricant in high temperature and high salt drilling fluid.

关键词： deep oil and gas Lubricant Environmentally friendly Water-based drilling fluid Molecular dynamics simulations

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Study on Screening and Performance Evaluation technology of Salt-Tolerant Foaming Agent 13th

Study on Screening and Performance Evaluation Technology of ...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jin, Yi Gao, Xiang Liu, Jian-Quan Chang, Qi-Fan Ye, Zhi-Lin Sun, Xun Zhang, Shi-Ling CNPC Engineering Technology R&D Company Limited Beijing China Beijing China

ISBN: (纸本)9789819702596

Foam drainage gas recovery technology is one of the most important technologies in drainage and gas production of shale gas wells. The effect of foam drainage which the main component of foaming agent is surfactant mainly depends on the type and performance of the foaming agent. In Jidong, Zhejiang and other oilfields, the salinity of formation water is high, which has strong inhibitory effect on the activity of surfactants. Therefore, it is necessary to select surfactants with high salt resistance as foaming agents. In this paper, we screened a foaming agent that can be dissolved and stable in the formation water with high salinity by evaluating the foaming ability, stability, liquid carrying capacity, compatibility and surface activity of four different types and concentrations of foaming agents with roche foam tester, liquid carrying rate tester and other relevant instruments. The results show that the foaming agent has good foaming and stability, better liquid carrying capacity and surface activity, and it can be used less with higher economic benefits than others, which provides a feasible scheme for the selection of foaming agent in shale bubble drainage process. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Surface active agents

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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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deep learning-Aided dull Grading Scheme for drill Bits

Deep learning-Aided Dull Grading Scheme for Drill Bits

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2024 International Petroleum technology Conference, IPTC 2024

作者： Sun, Jia Guo, Huijuan Wang, Baodong Zhang, Quanli Yang, Xiongwen Drilling Mechanical Department CNPC Engineering Technology R&D Company Limited Beijing China CNPC United States

ISBN: (纸本)9781959025184

drill bit design plays a key role in drilling operations. A suitable choice of the drill bit parameters (such as the profile shape, the orientation, and the distribution of cutters, etc.) will significantly improve the durability and stability of the drilling process, increase the rate of penetration (rOP) and enhance the drilling efficiency. Traditional strategies of the drill bit design usually involve a trial-and-error process to adjust the parameters, which is usually time-consuming and contains an element of subjectivity. Alternatively, machine learning techniques provide powerful tools to make full use of the collected data, and analyze the relation between the design parameters and the performance of the drill bits on specified rock mechanics data. In the present work, we aim at building a machine learning-aided scheme to help design the parameters of the drill bits. A machine learning-aided scheme is proposed to perform the drill bit design. First, a dull grading system is established to evaluate the wear extent of the drill bits from images. The grading system includes a cutter localization model to separate the cutters from drill bit images, a reconstruction model to regenerate the 3d geometries of the cutters from several 2d images, a classifier to evaluate the wear extent of the cutters, and an aggregative algorithm to grade the worn drill bits. The grading system is then applied to build the data set of the worn drill bits. Finally, an individual deep learning model is adopted to learn the relation between the design parameters and the wear extent, and a sensitivity analysis is performed to optimize the design parameters. The research results showed that: (1) the proposed machine learning-aided scheme could produce instructive guides on the drill bit design, reduce the analysis cost and provide accurate prediction on the impact of the design parameters. (2) The 3d reconstruction algorithm could efficiently extract the geometry feature of the drill bits

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New Generation Fracturing Fluid with Superior Proppant Transport and Oil displacement Functionalities

New Generation Fracturing Fluid with Superior Proppant Trans...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Lin, Genyao Huang, Jiangshui richardi, Bryant Yu, Stephanie Li, Jianshen Liu, Fuchen Lin, Lijun CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Ltd Beijing China

ISBN: (纸本)9781959025184

Multifunctional fracturing fluid is desirable in the oil and gas industry as it can simplify hydraulic fracturing operations and reduce environmental impact. Traditional high-viscosity fluids, like borate crosslinked fluid, can effectively transport proppant to keep fractures open but can constrain fracture length and damage the proppant pack. Conversely, low-viscosity options like linear gels, can extend fracture length and facilitate secondary fractures, but have limited proppant carrying capabilities. recent efforts have attempted to combine fracturing fluid with surfactants to achieve both hydraulic fracturing and improved oil recovery. However, these efforts require multiple additives and still lack sufficient proppant transportation. This study introduces a new generation fracturing fluid combining superior proppant transport and oil displacement functionalities, formulated with a unique polymer containing chemically bonded oil displacement surfactant. The new fracturing fluid was evaluated using a range of tests, including static proppant suspension test, rheology test, coreflood, regained conductivity and oil displacement tests. The static proppant suspension test compared the new fracturing fluid with a linear gel. The fluid's rheological properties were measured using an advanced rheometer. The spontaneous imbibition Amott test was conducted to appraise the fluid's oil displacement properties. The coreflood and regained conductivity studies were conducted at 160°F to evaluate the fluid's formation and proppant pack damage. The new generation fracturing fluid excelled in all tests studied. In the static proppant suspension test, it suspended the 20-40 mesh ceramic proppant much longer than the traditional guar-based fluid. The rheology test revealed that the 0.3wt% fluid's storage modulus G' is higher than the loss modulus G" across the whole spectrum of frequency tested, signifying high elasticity of the fluid. The spontaneous imbibition test demonstrated

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Numerical simulation of shallow conductor-soil displacement characteristics in deep water drilling 58

Numerical simulation of shallow conductor-soil displacement ...

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58th US rock Mechanics / Geomechanics Symposium 2024, ArMA 2024

作者： Zhang, Minghe Yang, Jin Wang, Haige Cui, Longlian Liu, Qi Kong, Lulin Sun, Ke Jia, Wanting CNPC Engineering Technology R&D Company Limited Beijing China Beijing China

ISBN: (纸本)9798331305086

Since the shallow soil is mostly composed of clay with weak cementation, the subsea wellhead is easy to be affected by external loads in the initial stage of installation, and the stability of the subsea wellhead is weak, which is prone to serious accidents such as sinking and tilting of the wellhead, resulting in significant economic losses and threatening the safety of deep-water operations. The traditional p-y curve calculation model cannot well reflect the vibration of the subsea wellhead and the detachment and displacement of shallow soil around the surface conductor. However, the Goodman contact element model in numerical simulation can simulate the discontinuity characteristics of the conductor-soil contact interface. In this paper, the numerical simulation method is used to discuss the vertical displacement characteristics of subsea wellhead under cyclic dynamic load and the displacement characteristics of shallow soil particles in different directions and depths around the surface conductor, and the factors affecting the displacement characteristics of conductor and soil are analyzed by load type, conductor installation depth, conductor diameter, and wellhead height above the mudline. It is important to explore the displacement characteristics of subsea wellheads and shallow soil for the design and stability evaluation of subsea wellheads. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Wellheads

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