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29th International Congress on Sound and Vibration, ICSV 2023

作者： Zejun, Hua Anxue, Jia Xiang, Miao Xianbo, Xue Haijun, Liu Botao, Zhou China Oilfield Services Limited China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9788011034238

Turbine is a commonly used component in downhole tools, and its flow field characteristics have a significant impact on the performance of downhole tools. This article is based on fluid dynamics theory, using finite element method and sliding grid technology to analyze the flow field characteristics and torque characteristics of a single turbine group. Analysis shows that when the displacement is constant, the turbine torque remains almost constant. This study can provide a basis for turbine design. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Finite element method

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research of drilling and completion technologies for heavy oil in venezuela and offshore presalt hydrocarbons in Brazil

Research of drilling and completion technologies for heavy o...

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SPE Middle East Oil and Gas Show and Conference 2019, MEOS 2019

作者： Fu, Jin Wang, Xi Zhang, Shunyuan Chen, Chen CNPC Engineering Technology R&D Company Ltd

Located in south of Eastern Venezuela Basin, Orinoco Oilfield is an onshore heavy oil field in South America. The heavy oil is known for its high content of acids, heavy metals and asphaltenes with a viscosity of 1000-10000mPa·s. According to the reserve report released by PdVSA by the end of 2016, JUNIN Block that is situated in east of Orinoco Oilfield has an OOIP of 178*108bbl. data of drilled wells and distances between offset horizontal intervals in Orinoco were both studied to improve ultimate production rates. 3-dimension borehole trajectories were designed and the most effective anti-collision measures were taken. After optimziation 8-12 horizontal wells are distributed on one pad. As the horizontal interval extends, the stable production time is prolonged and the accumulative production per well improves. However, the recovery rate stops increasing when the horizontal interval is over 1600m in JUNIN Block. Economically a large space between offset horizontal intervals results in fewer wells and lower costs, but a smaller space contributes to a higher production efficiency per well. If the space exceeds 600m, the accumulative production rate increases much more slightly. A three-dimension well trajectory consists of a vertical interval, an angle building interval, an angle holding interval, an angle building & direction changing interval, a direction turning interval as well as an absolute horizontal interval. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin after Campos Basin, where there are 9 oil fields ranking among the top 20 offshore oil fields in terms of OOIP. By June 2017 over 160×104bbl oil and gas were produced per day in deep water of Santos Basin, taking up 57.1% of the total yield of Cam

关键词： Offshore oil well production

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research on engineering technologies to develop China's complex reservoirs and their feasibility in development of marginal oilfields in South America

Research on engineering technologies to develop China's comp...

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Offshore technology Conference Brasil 2019, OTCB 2019

作者： Fu, Jin Wang, Xi Zhang, Shunyuan Liu, Bingshan Chen, Chen Yang, Guobin CNPC Engineering Technology R&D Company Ltd

ISBN: (纸本)9781613996713

Marginal Oilfields are refered to as those oilfields that are hardly developed efficiently with current technical and ecomonical conditions, characterized as high costs of development and low profit margins. However, under certain economical and technical circumstances, marginal oilfields may be transferred to be conventional ones. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin. cnpc signed a cooperation contract with Petrobras in 2013, taking 10% of the total shares. How to efficiently develop the oilfield has been a challenging issue. Technologies of smart water injection in Shengli Oilfield have been studied, while the field development and environment (deep water) of Libra Oilfield have been analyzed, in order that the smart water injection technologies may be modified to develop the marginal oilfield more efficiently. different from conventional zonal water injection technologies, the remote wireless control water injection technologies take advantages of packers that are connected with each other via preset cables, which achieves downhole testing and water injection simultaneously. Being run via tubing, the water injection string locates a nozzle for each reservoir that is isolated by a packer. All nozzles are connected with packers via the preset cables that work as power lines for the whole string, so that downhole data such as pressures, flows and temperatures are all transferred to the processing computer on the surface. The computer program is used to convert pressure and formation signals into curves that are transferred to company via WIFI or mobile 2G/3G/4G webs, in order that technicians there may understand and learn about downhole pressures, temperatures, flows and nozzle conditions in real

关键词： Offshore oil well production

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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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Technical and risk assessment of underground gas storage construction and operation in China and Caspian region

Technical and risk assessment of underground gas storage con...

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SPE russian Petroleum technology Conference 2019, rPTC 2019

作者： Fu, Jin Wang, Xi Chen, Chen Chen, Haowei Zhang, Shunyuan Liu, Bingshan CNPC Engineering Technology R&D Company Ltd

ISBN: (纸本)9781613996928

Since China proposed "Belt and road" initiative in 2013, Caspian countries have become a crucial region for oil and gas cooperation. However, it has been a common technical issue to develop presalt oil and gas resevoirs in the world. Caspian region is known for the wide-spread thick salt-gypsum formations. In China some old wells that were depleted due to engineering difficulties arising from presalt formations started to be developed as underground gas storages. The crude oil price has been keeping at a low level in recent years, which made China's government put more efforts in the development of underground oil storages in depleted salt caverns. As the largest project of underground gas storages, Jintan gas storage construction project successfully made best use of depleted salt caverns. A Sonar test was applied on 4 Jintan underground salt caverns that are 900m deep and 1000m away from the surface in order to reveal their shapes. Salt and muddy salt rocks were collected in Jintan as samples to be analyzed in 3-axis pressure tests. Numerical results with finite element method (FEM) code ABAQUS were studied to approach the creep behaviors of caverns and rock pillars. The pressure arch model and the most dangerous sliding surface model were both utilized to optimize geometric parameters of the upper and lower walls of dissolved cavities. Creep happens on salt rocks under deviator stress, which has non-linear relationship with time. In the simulated gas storage process the internal pressure went up to 14.0 MPa within 3 months but dropped to 7.0MPa in the following 3 months. The above condition may last for 9.5 years in real scenarios. Surrounding rocks of caverns deformed during construction but the most obvious creep was found at their tops and bottoms. Within 10 years salt pillars between caverns are under high deviator stress, thus their creep is the most serious. Surrounding rocks become unstable as the internal pressure of caverns decreases. The creep scope of

关键词： Caves

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drILLING-PIPE dYNAMIC ANALYSIS ANd VErIFICATION IN HOrIZONTAL WELL 29

DRILLING-PIPE DYNAMIC ANALYSIS AND VERIFICATION IN HORIZONTA...

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29th International Congress on Sound and Vibration, ICSV 2023

作者： Zhisheng, Zhang Xiangyang, Wu Jinliang, Zhang Zhidong, Zhang Yan, Mei Gang, Li Junlong, Chen CO. Ltd China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9788011034238

Horizontal well technology is an essential means of enhancing drilling productivity and oil and gas production. However, the deviation angle of horizontal wells is highly variable, resulting in significant drill-pipe friction. due to the influence of its own gravity, the drill-pipe approaches the floor of the wellbore as the horizontal displacement increases. during rotary drilling, the drill-pipe exhibits evident nonlinear characteristics and is susceptible to lateral vibration. This article establishes a mathematical model for the lateral vibration of a horizontal drill-pipe considering the drilling fluid inside the drill-pipe and the drilling fluid in the annulus based on variables such as drilling fluid flow rate, drilling fluid density, drilling fluid viscosity coefficient, gravity, friction, and drilling pressure. The calculation technique is provided, and the displacement equation and vibration frequency equation of the horizontal drill-pipe's lateral vibration are derived. The frequency of lateral vibration under various parameter conditions is analysed using numerical simulation. Moreover, by compiling site-specific data for comparison, it was determined that the model accurately describes the lateral vibration of the drilling string. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： drills

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Study on the Wellbore reconstruction refracturing technology Based on Expandable Tubular

Study on the Wellbore Reconstruction Refracturing Technology...

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2023 SPE/IAdC Middle East drilling technology Conference and Exhibition, MEdT 2023

作者： Guo, H.J. Zhou, Y. Wang, B.d. Zhang, Q.L. Xu, B.G. Jao, T. Zhou, S.H. Drilling Mechanical Department CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781613999974

refracturing is a promising means to improve the output and estimated ultimate recovery of shale oil and gas resources, which is an efficient method to recover the productivity of low permeability old wells. refracturing has achieved good results in the development of shale gas wells in North America, and has increased output and decreased the extraction cost significantly of shale gas resources. The disadvantage of unable to control the fracturing fluid accurately of the conventional temporary plugging diverting refracturing technologies like chemical particulates has been exposed in the applications. Wellbore reconstruction technology based on the solid expandable tubular (SET) was studied in this paper, which is a permanent plugging diverting refracturing technology with a high sealing effect and simple operation. Technical principles, tool structures and construction processes were analyzed and relative laboratory tests were conducted to verify the feasibility of this technology. Meanwhile, comparisons between expandable tubular technology and other refracturing technologies were developed to analyze the application prospect in shale oil and gas resources. The indoor tests indicated that wellbore reconstruction technology based on expandable tubular can plug the perforation on the casing effectively with certain sealing pressure, which showed that this technology can realize the wellbore reconstruction to create the wellbore conditions for the next fracturing work. Compared with other temporary plugging refracturing technologies, the expandable tubular technology can achieve accurate control of fracturing fluid and has a better effect of refracturing work. At the same time, it has the advantages of simple operation and big internal diameter compared to other wellbore reconstruction methods like casing plugging technology, which means that bigger displacement can be used and better effect can be achieved in the refracturing work. The conclusions obtained in this

关键词： Oil field equipment

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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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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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Experimental study on the synthesis and interfacial properties of oligomeric silicone surfactant

Experimental study on the synthesis and interfacial properti...

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SPE International Conference on Oilfield Chemistry 2019

作者： Jie, Zhang Xu, Xianguang Wang, Lihui Li, Long Zhang, die Zhao, Zhiliang Wang, Shuangwei CNPC Engineering technology R and D company limited China

ISBN: (纸本)9781613996331

Severe formation damage is induced by the invasion of working fluid and the subsequent water blocking. Surface modification by surfactant adsorption can change the wettability of the rock surface to enhance the removal efficiency of reservoir fluid and reduce the water blockage damage. Therefore, surfactant shows a good potential applicant in condense reservoir. In the current paper, an oligomeric silicone surfactant (OSSF) containing sulfonic acid groups is synthesized to improve the water flowback effect. The critical micelle concentration (CMC) is determined by equilibrium surface tension. Micelle can be formed above the CMC and its size and distribution increase with the concentration. At the same time, the surface tension increases with the aging temperature but decreases with the adding of inorganic salt. The OSSF adsorption through solid-liquid surface can change the surface chemical composition and transfer the wettability of reservoir from water-wet to gas-wet by decreasing the surface energy. Increasing temperature leads to the change in the adsorption isotherm from Langmuir type (L-type) to "double plateau" type (LS-type). Quantum chemistry study shows that the adsorbed layer of OSSF can reduce the adhesive force of CH4 and H2O on the pore surface of cores. The OSSF can also decease the initial foaming volume and stability in induction period and accelerating period of sodium dodecyl benzene sulfonate (SdBS). It is found that the surface tension of OSSF increases with aging temperature but decreases with the adding of inorganic *** OSSF has positive effect on wettability reversal to water-wet reservoir by adsorption on solid-liquid interface. The results indicate OSSF adsorption layer can change surface chemical composition and exhibit lower interface energy than that of the cores. The presence of NaCl can decrease foaming volume and improve foam stability of OSSF. At the same time, OSSF can decease the initial foaming volume and stability in induct

关键词： Surface tension

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