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Application of Multifunctional Wellbore Cleaning Fluid in the removal of residual drilling Fluids in Ultra-deep Wells: research Progress and Prospects

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SSrN 2024年

作者： Song, Hanxuan Guo, Jixiang Li, Jiao Zhang, Shiling de Oliveira, Adilson Julio Soares He, Aiguo Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

developing ultra-deep wells presents a significant challenge in current petroleum exploration and production. Ensuring the cleanliness of the wellbore is a crucial aspect of safeguarding the development process. removing contaminants from residual drilling fluids is vital to ensure unobstructed production pathways in ultra-deep wells, thereby achieving secure operational environments. This paper analyzes the primary residual components of drilling fluids in post-drilling operations of ultra-deep wells. It also explores the synergistic damaging mechanisms of residual drilling fluids on casing-ion corrosion and abrasive wear. Moreover, we summarize the technical challenges involved in the flushing and treatment of ultra-deep wellbores. drawing from global developments in flushing fluids for ultra-deep wellbores, this study investigates the performance and on-site applicability of various flushing fluids. The findings indicate that the flushing of ultra-deep wellbores necessitates the development of fluid systems tailored to different well conditions and residual components. Adaptable flushing fluids exhibit suitability across diverse operational scenarios. Furthermore, understanding the mechanisms of flushing fluids provides novel perspectives for their future development. Presently, research on the mechanisms of flushing fluids predominantly relies on experimental observations and theoretical simulations. This study analyzes the future directions of flushing fluid research by summarizing and synthesizing existing technical challenges. In conclusion, as discussed in this study, the tailored technology for flushing wellbores lays a fundamental groundwork for large-scale flushing and treatment of ultra-deep wells, thus offering a foundational contribution to the field. © 2024, The Authors. All rights reserved.

关键词： drilling fluids

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research on the Pollution and damage Mechanism of drilling Fluid on Casing during Ultra-deep Well drilling Process

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SSrN 2024年

作者： Hanxuan, Song Shiling, Zhang Xiangwei, Chen Kiyingi, Wyclif Jixiang, Guo ruiying, Xiong Li, Wang Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

In drilling ultra-deep wells, the degree of casing/tool damage decreases with an increase in bottom hole temperature, and the casing/tool is least damaged within a temperature range of 150-180°C. The wettability of drilling fluid on the casing/tool surface increases with an increase in the degree of roughness. Oil-based drilling fluid have the strongest adhesion contamination on casing/drilling tools. Polysulfonated potassium drilling fluid and ultra-micro drilling fluid have the most potent erosion damage on casing/drilling tools. By analyzing the damage mechanism, it was established that the damage was mainly dominated by the abrasive wearing from solid-phase particles in concert with corrosion ions in drilling fluid, with solids producing many abrasion marks and corrosive ions causing a large number of pits. © 2024, The Authors. All rights reserved.

关键词： Tribology

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Experimental study of multi-timescale crack blunting in hydraulic fracture

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Petroleum Science 2021年第1期18卷 234-244页

作者： Jing-Nan dong Guang-Jie Yuan Xiang-Yang Wang Mian Chen Yan Jin Chao Zeng Musharraf Zaman State Key Laboratory of Petroleum Resources and Prospecting(Beijing) Beijing 102249China College of Petroleum Engineering China University of PetroleumBeijing 102249China CNPC Engineering Technology R&D Company Limited Bejjing 102206China Department of Civil Architectural and Environmental EngineeringMissouri University of Sciences and TechnologyRollaMOUSA Mewbourne School of Petroleum and Geological Engineering University of OklahomaNormanOK 73019USA

Hydraulic fracture is important in unconventional oil and gas *** the propagation of the hydraulic fracture,the crack tip is blunted due to the development of the process zone in the near-tip *** this study,the blunting of the hydraulic fracture in polymethyl methacrylate specimens due to multi-timescale stress concentration is *** ratio of the initiation toughness to the arrest toughness of the blunted hydraulic fracture is measured using both the dynamic and the static *** show that a hydraulic fracture can be blunted with the time span of stress concentration from 1 ms to 600 *** is also shown that the blunting of hydraulic fracture is a highly localized *** morphology of the blunted crack depends on the stress distribution in the vicinity of the crack tip.

关键词： Hydraulic fracture Crack blunting Crack tip morphology

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design and test of a torque-on-kelly measuring instrument

Design and test of a torque-on-kelly measuring instrument

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Electrical engineering and Automation (IFEEA), International Forum on

作者： rutao Ma Guohai Yuan Fei Ai Guoping Li Tingfu Ye Jingbing Luo Junlin Liu Xue Xia Shengpeng Yan LLC CNPC Engineering Technology R&D Institute Beijing China Shen Zhen Branch CNOOC China Ltd. Shenzhen China Petrochina Qinghai Oilfield Company LLC Dunhuang China

The torque on kelly measuring instrument is mainly used for real-time measurement of the dynamic torque on the lower joint of the kelly during drilling and workover processes. Safety of the operation could be evaluated based on measuring results. By analyzing the mechanical properties of metal materials under dynamic working conditions, engineering materials are selected. The main structure of the torque measuring instrument is designed in a small mandrel type. The torque measuring bridge and electric circuit are configured to realize real-time torque testing. Experimental platform was built to verify and analyze multiple sets of data, verifying the feasibility, effectiveness, and accuracy of the design. The research results provide a real-time torque testing method and technical support for drilling and workover operations.

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The biodiesel-based flat-rheology drilling fluid system

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Petroleum Exploration and development 2022年第1期49卷 200-210页

作者： JIANG Guancheng SHI He HE Yinbo Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China MOE Key Laboratory of Petroleum Engineering China University of Petroleum(Beijing)Beijing 102249China CNPC Engineering Technology R&D Company Limited Beijing 102206China

As the base oil of the current flat-rheology synthetic drilling fluid is high in cost and not renewable, the biodiesel-based flat-rheology drilling fluid with low-cost, environmental protection and renewable advantage was studied. Based on the optimization of raw materials, a cheap, environment-friendly biodiesel of soybean oil ethyl ester with good fluidity at low temperature was selected as the base oil. By selecting high oil-water ratio and introducing cationic surfactant into the auxiliary emulsifier, the thickening of biodiesel-based emulsion caused by hydrolysis and saponification after high-temperature aging was effectively eliminated. The organoclay prepared with cationic modifier of hexadecyl trimethyl ammonium chloride was used to improve the rheologic properties, stability and fluid loss of the drilling fluid while preventing low-temperature thickening. A flat-rheology modifier was synthesized with dimer fatty acid and cocoanut fatty acid diethanolamide, which could form strong network structure in the biodiesel-based drilling fluid to adjust effectively rheological properties of the drilling fluid. A biodiesel-based flat-rheology drilling fluid system with the density of 1.2 g/cm^(3) has been formulated which has constant rheology in the temperature range of 2-90 ℃, temperature tolerance of 160 ℃, seawater salinity tolerance of 5%, shale cuttings tolerance of 10%, and is environmentally friendly.

关键词： biodiesel flat-rheology drilling fluid emulsifier organoclay rheology modifier environment friendly deep water drilling

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An On-Line Inductance Identification Method for Permanent Magnet Synchronous Motors Under Sensorless Control in The Full Speed domain 10

An On-Line Inductance Identification Method for Permanent Ma...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liu, Yue Wang, Liguo Gao, Qiang Li, Yong Fei, E. Shanghai Jiao Tong University Department of Electrical Engineering Shanghai China State Grid Suzhou Power Supply Company Substation Maintenance Center Suzhou China Contemporary Amperex Electric Vessel Technology Co. Limited Department of R&d Ningde China Contemporary Amperex Electric Vessel Technology Co. Limited Department of Technology Ningde China

ISBN: (纸本)9798350351330

This work presents an online inductance identification method for permanent magnet synchronous motors in the full speed domain. Online inductance estimation is realized by injecting two modified high-frequency square wave voltage signals into the d-q axis simultaneously. This method can achieve high-precision identification of inductance in the full sensorless speed domain. The simulation results show that the inductance identification accuracy of this method can reach ±4% whether under constant loading, sudden addition and subtraction loading or dynamic loading. © 2024 IEEE.

关键词： Inductance

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Elimination Strategy of Position Error for High Power Permanent Magnet Motor drive

Elimination Strategy of Position Error for High Power Perman...

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Power engineering Conference (SAUPEC), Southern African Universities

作者： Zhi Liu Jian Li Yang Lu Tao Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China CRRC Dalian R&D Company Ltd Dalian China

Permanent magnet synchronous machine (PMSM) becomes more and more popular in railway traction systems. due to non-ideal factors of position sensor, obtained rotor position exists nonlinear error, which makes a bad influence to control performance of PMSM. In this paper, the effect of position error on current harmonics from the perspective of pulse width modulation is studied by detailed mathematical derivations. Severe dc offset and current harmonics problems caused by position error brings torque ripples and extra switching losses, which is unacceptable in railway traction systems. To solve the problem, an algorithm of reconstructing rotor position considering the characteristics of high power motor is proposed, which is consisted of low-pass filter (LPF) and phase-locked loop (PLL). The reconstruction is implemented on dSP chip, which is simple and reliable. The current harmonics problem can be well improved using the proposed scheme. Simulations have been carried out to verify the effectiveness of proposed rotor position reconstruction strategy.

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research on online inspection technology for wellhead equipment based on phased array ultrasonic testing 4

Research on online inspection technology for wellhead equipm...

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4th International Conference on Testing technology and Automation engineering, TTAE 2024

作者： Liu, Haohao Feng, Shaobo Zhao, Mifeng Wei, Junhui Wang, Pengcheng Zhou, Xuan Pan, Jianwu Zhang, Yushu Cao, Jia PetroChina Jianghan Machinery Research Institute Co. Ltd. Jingzhou434001 China Tarim Oilfield Company PetroChina Korla841000 China R&D Center for Ultra-Deep Complex Reservoir Exploration and Development CNPC Korla841000 China Engineering Research Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development Xinjiang UygurAutonomous Region Korla841000 China

ISBN: (数字)9781510686656

ISBN: (纸本)9781510686649

For major oil fields under PetroChina, the wellhead equipment is usually abundant and diverse, selected based on the depth of the reservoirs and the extraction processes. during service, wellhead equipment is prone to erosion and corrosion, which can lead to safety risks such as leaks. Therefore, corrosion detection of high-risk wellhead equipment in service is crucial for ensuring the safe operation of these devices. Considering the operating conditions and structural characteristics of wellhead equipment, the applicability of various non-destructive testing methods was compared, and a defect detection scheme for wellhead equipment, primarily based on phased array ultrasonic testing(PAUT), was determined. Using PAUT technology, an online inspection was conducted on the wellhead equipment of 10 oil and gas wells in the Keshen block of Tarim Oilfield, which were prone to corrosion. It was found that in two of these wells, the passage and flange end surface of the production wing connection short section were both corroded, with the corrosion groove having a depth of approximately 5.0 mm and a width of approximately 50 mm. The on-site inspection results validated the feasibility of applying PAUT for online inspection of wellhead equipment. © 2024 SPIE.

关键词： Ultrasonic testing

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Transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis:A case study of the Cretaceous of the Mesopotamia Basin in the Middle East

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Petroleum Exploration and development 2021年第6期48卷 1367-1382页

作者： YE Yu LI Fengfeng SONG Xinmin GUO rui Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China CNPC Engineering Technology R&D Company Limited Beijing 102206China

The transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis was stud-ied based on core,cast thin section and physical property data of Cretaceous strata in the Mesopotamia Basin,the Middle *** are 3 ways of biological transformation of rocks:(1)The living creatures transformed formations mechanically to make the rocks looser and intergranular pores increase.(2)After formation,burrows were backfilled with coarse-grained debris,and then unsaturated fluid infiltrated into the burrows during the penecontemporaneous period,resulting in dissolution.(3)Chemical alteration occurred in abandoned burrows and dolomitization produced a large number of intercrystalline ***·coupling of bioturbation and dissolution occurred mainly in the penecontemporaneous phase,and was controlled by rock type,sea level decline,burrow abundance,infillings,and water environment *** the burrows had better physical properties than the matrix,unsaturated fluid preferentially migrated along the burrows,leading to dissolution and expansion of the burrows first and then dissolution of the *** coupling of bioturbation and dolomitization occurred mainly in the burial *** rich organic matter and reducing bacteria in the burrow provided material basis,reducing conditions and alkaline envi-ronment for *** metasomatism in the penecontemporaneous period had little effect on the physical properties of the *** the burrows were se parated from the deposition interface,equimolar metasomatism occurred in the burrows in a closed environment,forming euhedral fine-crystalline dolomite with intercrystalline *** transformation degree of bioturbation to muddy carbonate reservoir depends on rock type,density,connectivity,infillings and structure of the *** the increase of the carbonate mud content,the im provement to rock physical properties by bioturbation be-comes more *** the burrows are filled with co

关键词： bioturbation muddy carbonate rocks Mesopotamia Basin Cretaceous diagenesis dissolution dolomitization

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Multi-scale elastoplastic mechanical model and microstructure damage analysis of solid expandable tubular

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Chinese Physics B 2020年第10期29卷 336-348页

作者： Hui-Juan Guo Ying-Hua Liu Yi-Nao Su Quan-Li Zhang Guo-dong Zhan Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China Drilling Mechanical Department CNPC Engineering Technology R&D Company LimitedBeijing 102206China Drilling Technology Division EXPEC Advanced Research CenterSaudi Arabia

We present an in-depth study of the failure phenomenon of solid expandable tubular (SET) due to large expansion ratio in open holes of deep and ultra-deep wells. By examining the post-expansion SET, lots of microcracks are found on the inner surface of SET. Their morphology and parameters such as length and depth are investigated by use of metallographic microscope and scanning electron microscope (SEM). In addition, the Voronoi cell technique is adopted to characterize the multi-phase material microstructure of the SET. By using the anisotropic elastoplastic material constitutive model and macro/microscopic multi-dimensional cross-scale coupled boundary conditions, a sophisticated and multi-scale finite element model (FEM) of the SET is built successfully to simulate the material microstructure damage for different expansion ratios. The microcrack initiation and growth is simulated, and the structural integrity of the SET is discussed. It is concluded that this multi-scale finite element modeling method could effectively predict the elastoplastic deformation and the microscopic damage initiation and evolution of the SET. It is of great significance as a theoretical analysis tool to optimize the selection of appropriate tubular materials and it could be also used to substantially reduce costly failures of expandable tubulars in the field. This numerical analysis is not only beneficial for understanding the damage process of tubular materials but also effectively guides the engineering application of the SET technology.

关键词： solid expandable tubular(SET) material microstructure damage multi-scale elastoplastic model virtual failure

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