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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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driving Cost reduction in CCUS Projects: Innovating Qualification Technologies to replace Expensive CrA with Cost-Efficient Glass Fiber Polymer Composites

Driving Cost Reduction in CCUS Projects: Innovating Qualific...

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Offshore technology Conference, OTC 2025

作者： Zhao, L. dunne, T. ren, J.X. Li, W.H. Cheng, P. CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025610

The imperative role of Carbon Capture, Utilization, and Storage (CCUS) in achieving the global carbon emissions reduction target of 15-20% by 2050 is widely recognized. However, the sluggish progress in CCUS deployment stems primarily from substantial initial capital outlays, notably attributed to the use of costly Corrosion-resistant Alloys (CrA). These alloys are essential due to the corrosion challenges posed by supercritical CO2 from the capture facility to the injection wells. Glass Fiber reinforced Polymer Composite (GFPC), with its high corrosion resistance and excellent mechanical strength, emerges as a costefficient alternative to CrAs. despite this potential, GFPC faces challenges related to limited data, poor understanding of degradation mechanisms, especially in supercritical CO2, and difficulties in evaluating its operational lifespan. To expedite the adoption of GFPC, this study systematically investigates the degradation mechanisms of GFPC in CCUS injection wells and introduces an industry-crucial model for qualifying GFPC grades for long-term usage as downhole liners. Conventional GFPC tubular qualification methods involve excessively long aging tests (e.g., 417 days as per ISO 14692) with overly conservative safety margins, making qualification cost- and time-prohibitive. To overcome this challenge, a mature GFPC grade with over 50 years of field deployment data was chosen, and a novel accelerated lab testing method (completed in 56 days) was established by plotting mechanical property decay as a function of time at temperatures below its glass transition temperature. Systematic investigations, employing various characterization tools, were conducted to analyze microstructure changes, polymer/fiber bond alterations, and thermomechanical property variations. A numeric degradation model was developed by correlating lab test results with long-term field data to provide a reasonable evaluation of the long-term application of GFPC as liner materials in s

关键词： Corrosion resistant alloys

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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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digital Twin System Utilizing Hybrid Approach of Physics Model and Machine Learning for Pipe Stuck Early Identification and Warning Based on real-Time data

Digital Twin System Utilizing Hybrid Approach of Physics Mod...

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2024 Offshore technology Conference Asia, OTCA 2024

作者： Zhang, Jiawei Wang, Haige Ji, Guodong Zhuo, Lubin Zhao, Zhixue Liu, Xiaoao Chen, Weifeng CNPC Engineering Technology R&D Company Limited Beijing China Drilling Engineering Technology Research Institute of CNPC Daqing Drilling Engineering Company Daqing China

ISBN: (纸本)9781959025030

Pipe stuck accident is one of the primary causes contributing to NPT (Non-Productive Time) in the drilling industry, incurring global financial losses amounting to hundreds of millions annually. For decades, Practices and techniques have been formulated and developed to avoid and tackle this downhole accident, while the early detection and proactive management are critical for effectively preventing this issue at its early stage. This paper presents the development and implementation of a novel digital Twin system, which amalgamates physics-based modeling and machine learning to facilitate real-time monitoring and early warning of pipe stuck while drilling. The system performs a real-time simulation of hook load, torque, and SPP (Standpipe Pressure) under various drilling states based on T&d and wellbore hydraulics models, which undergo verification and calibration within predefined computing cycles in order to enhance accuracy and reduce error margins. The PSrI (Pipe Stuck risk), ranging from 0-100%, is based on rOC (rate of change) of these three actual drilling parameters and the deviation of the simulated value from actual ones under different drilling states, is proposed to provide a comprehensive risk assessment over time series regardless of drilling state. A Continuous, real-time assessment of pipe stuck risk, categorized into low (green), medium (yellow), and high (red) levels, can be realized with thresholds for parameter deviation and rOC derived from historical data of wells with and without pipe stuck accidents and rFA (random Forest Algorithm). The system is designed to alert users such as drillers or monitoring specialists with visual and auditory signals when a high-risk scenario is detected, prompting immediate preventative or corrective actions. Case studies have shown that the system could provide early warnings of high-risk of pipe stuck typically between 30 minutes to 2 hours ahead, particularly during back-reaming and tripping operation. This c

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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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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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A creep model for ultra-deep salt rock considering thermal-mechanical damage under triaxial stress conditions

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Journal of rock Mechanics and Geotechnical engineering 2024年第2期16卷 588-596页

作者： Chao Liang Jianfeng Liu Jianxiong Yang Huining Xu Zhaowei Chen Lina ran College of Water Resource and Hydropower Sichuan UniversityChengdu610065China CNPC Key Laboratory of Oil and Gas Underground Storage Engineering Langfang065007China CNPC Engineering Technology R&D Company Limited Beijing102206China

To investigate the specific creep behavior of ultra-deep buried salt during oil and gas exploitation,a set of triaxial creep experiments was conducted at elevated temperatures with constant axial pressure and unloading confining pressure *** results show that the salt sample deforms more significantly with the increase of applied temperature and deviatoric *** accelerated creep phase is not occurring until the applied temperature reaches 130℃,and higher temperature is beneficial to the occurrence of accelerated *** describe the specific creep behavior,a novel three-dimensional(3d)creep constitutive model is developed that incorporates the thermal and mechanical variables into mechanical ***,the standard particle swarm optimization(SPSO)method is adopted to fit the experimental data,and the sensibility of key model parameters is analyzed to further illustrate the model *** a result,the model can accurately predict the creep behavior of salt under the coupled thermo-mechanical effect in deep-buried *** on the research results,the creep mechanical behavior of wellbore shrinkage is predicted in deep drilling projects crossing salt layer,which has practical implications for deep rock mechanics problems.

关键词： Creep experiments Creep model Thermal and mechanical damage Fractional derivative

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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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Proppant Screen-Out during re-Fracturing Caused by damage of Heavy Mud in Existing Fractures: Case Study and Solutions

Proppant Screen-Out During Re-Fracturing Caused by Damage of...

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2023 SPE Argentina Exploration and Production of Unconventional resources Symposium, LAUr 2023

作者： Liu, Huifeng Xu, Zhixiong Yuan, Zebo Han, Haochen Wen, Zhiming Li, Jianbo Song, Lu CNPC Engineering Technology R&D Company Limited CNPC R&D DIFC Company Limited PetroChina Tarim Oilfield Company China

ISBN: (纸本)9781613999752

The reservoir pressure coefficient is over 1.80 in the Kelasu foreland area in western China. Heavy mud weighted by ultra-micro barite is used to kill the well for downhole operations. For the wells that have been fractured, the mud easily leaks into the fractures, bringing barite weighting agent into the existing fractures and damaging the well productivity. re-fracturing is conducted in order to recover the well productivity, but abnormal pumping pressure and proppant screen-out is frequently encountered. Three typical wells that have encountered such problems were analyzed by construction data comparison and using the fracturing simulator StimPlan. The root causes were firstly theoretically analyzed and then laboratory tests were also carried out to verify our theoretical deductions. The comparison results show that the pressure for fracture extension during re-fracturing of the three wells is 20%-40% higher than the initial fracturing;the leakage of the heavy well killing fluid weighted by ultra-micro barite during downhole operations was the main cause of the abnormal pumping pressure and the proppant screen-out during re-fracturing. The laboratory test results showed that the properties of the ultra-micro barite well killing fluid is relatively good after rolling for 15 days under high temperature, but its density and rheological parameters tend to decline due to barite sedimentation;the invasion of the heavy well killing fluid into the matrix reduced the Young's modulus by 3%-5% but increased the Poisson's ratio by 102.42% maximally, which would consequently reduce the dynamic fracture width and lead to abnormally-high pumping pressure and proppant screen-out during re-fracturing. The damage of the heavy well killing fluid to the existing propped fractures was also serious. It reduced the propped fracture permeability by 50%-80% and the retained barite in the fracture was difficult to displace out. Several solutions have also been provided for wells with pote

关键词： Proppants

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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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