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research on the method of dynamic PdC cutters distribution

IOP Conference Series: Earth and Environmental Science 2021年第1期675卷

作者： Qi Peng Yingcao Zhou Xiongwen Yang Yu Liu Chris Cheng CNPC Engineering Technology R & D Company Limited Beijing China Research Institute of Petroleum Exploration & Development Beijing China CNPC USA Corporation (Houston TX USA)

PdC bit design, especially the design of the crown and cutters of PdC bit, is a relatively complex analysis process, which involves many factors such as the back-dip angle, cutting depth, cutting force, cutting power and other factors of PdC cutters. At present, the traditional design methods of PdC cutters distribution are mostly based on analysis of rock breaking efficiency of single cutter, which can only reflect the working state of the single cutter under the set parameters, and cannot fully reflect the differences of different positional cutters during the cutting process. In order to solve this problem, this article proposes a dynamic method through target formation lithology characteristics. The working parameters of all the PdC cutters are analyzed in detail basing on equal wear theory and bottom hole covering theory. The working parameters include static parameters (cutting position, back dip angle, cutting depth, effective cutting area.) and dynamic parameters (cutting force, cutting power, cutting torque and cutting energy etc.). The energy required by all the PdC cutters to break rock of per volume during drilling process is taken as the target constraint condition for iterative analysis. This design method can intuitively and effectively analyse the working parameters of cutters which located bit core, nose, shoulder and gauge area, and it provides a good reference for dynamic balance design of PdC bit.

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distributed curvature sensing based on a bending loss-resistant ring-core fiber

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Photonics research 2020年第2期8卷 165-174页

作者： LI SHEN HAO WU CAN ZHAO LEI SHEN rUI ZHANG WEIJUN TONG SONGNIAN FU MING TANG Wuhan National Laboratory for Optoelectronics(WNLO)&National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fiber and Cable Joint Stock Limited Company(YOFC)R&D CenterWuhan 430073China

A theoretical and experimental study on curvature sensing using a Brillouin optical time-domain analyzer based on the ring-core fiber(rCF)is *** Brillouin gain spectrum of the rCF is investigated,and the Brillouin frequency shift(BFS)dependence on temperature and strain is *** theoretically analyze the fiber bending-induced BFS and peak Brillouin gain variation for the rCF through a numerical simulation method,and the rCF is revealed to have a high curvature *** curvature sensing is successfully demonstrated,with the bending radius ranging from 0.5 to 1.5 cm,corresponding to a BFS variation from 32.90 to7.81 *** rCF takes advantage of great bending loss resistance,and the maximum macrobending loss at the extreme bending radius of 0.5 cm is less than 0.01 d B/***,the peak Brillouin gain of the rCF is discovered to vary significantly in response to fiber bending,which is expected to be another parameter for distributed curvature *** results imply that the rCF is a promising candidate for highly sensitive distributed curvature measurement,especially in sharp bending circumstances.

关键词： fiber bending curvature

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design and laboratory experiment of a new downhole vibration cementing tool

Design and laboratory experiment of a new downhole vibration...

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2019 ASABE Annual International Meeting

作者： Binhui, Liu Weikun, Bian Yusi, Feng Xiong, Yuan Junpeng, Li Yiyong, Yin CNPC Engineering Technology R and D Company Limited No 5. Huang he Rd Changping Beijing102206 China College of Engineering China Agricultural University No 17. Qinghua East Rd Haidian Beijing100083 China

Vibration cementing is a promising new cementing technology. It is very important for the improvement of interfacial bonding strength to vibrate in the waiting on cement time. The downhole vibration cementing tool can not only cause vibration in the waiting on cement time but also not change conventional cementing technology. Firstly, the key components of downhole vibration cementing tool are designed and tested by the overall design index. Secondly, the modal of downhole vibration cementing tool is tested. Finally, the vibration frequency and vibration amplitude of downhole vibration cementing tool are test. The experimental results show that: ①the working time and speed range of downhole vibration cementing tool are in accordance with the design index;②downhole vibration cementing tool itself does not resonate in the range of 5Hz~20Hz, ensuring that the tool will not fail due to the resonance of the casing string;③Through the design of laboratory experiment, the vibration frequency and vibration amplitude of downhole vibration cementing tool are tested, and the pressure value required for cutting the pin is verified. The test result is in accordance with the design goal. The experiment is ready for the subsequent construction of the field test. © 2019 ASABE Annual International Meeting. All rights reserved.

关键词： Cements

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An Integrated Method for Evaluating Lost Circulation risk for Shale Gas drilling in Sichuan Basin

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IOP Conference Series: Earth and Environmental Science 2021年第6期861卷

作者： rong-Chao Cheng Ming-Ming Chu Jie Zhang Hui-Jiun Hao Hai Lin Qiang Tan Yong-Cun Feng CNPC Engineering Technology R&D Company Limited Beijing 102206 Tianjin Branch China National Offshore Oil Corporation Tianjin 300452 China College of Petroleum Engineering China University of Petroleum Beijing

Accurate prediction of lost circulation fracture width and lost circulation pressure is the basis for preventing lost circulation and curing the losses. They are controlled by many factors, such as in-situ stress, wellbore fluctuating pressure, rock properties, natural fractures, and so on. researchers have put forward a variety of calculation models of lost circulation pressure for fractured formations; however, in the field practice, it is still mainly based on the minimum horizontal principal stress. The lost circulation of fractured formation seriously jeopardizes the safety and progress of drilling and production. At present, the success rate of curing the losses is low, one of the important reasons is that the fracture width cannot be accurately predicted. It is difficult to determine the wellbore strengthening method and particle size of the lost circulation materials due to unknown fracture width. Various prediction models of fracture width are used to calculate the fracture width of the loss layer, and the influence of the factors such as the loss time, drilling fluid properties (viscosity and yield value), and the angle between the fracture and the wellbore on the calculated fracture width is studied. For the lost circulation pressure, the acceptable loss rate in the drilling process is given. On the premise of the calculated fracture width, the lost circulation pressure under the acceptable loss rate is determined. The results show that the values of fracture width and lost circulation pressure predicted by the three methods are close to each other, and the prediction results of the three methods can be averaged in the field application to provide reference for the following work. The fracture width is sensitive to drilling fluid viscosity, bottom hole pressure, and other parameters, so the value of these parameters should be accurately measured in the field to reduce the uncertainty. The results also show that the larger the angle between fracture and we

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An Experimental Study on optimizing the particle size distribution of bridging agents in drilling fluids

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IOP Conference Series: Earth and Environmental Science 2021年第1期631卷

作者： Cheng Hui Chengyun Ma deliang Tian Chao Luo Lingzhan Zou Haige Wang CNPC Engineering Technology R&D Company Limited Beijing 102206 China College of Petroleum Engineering China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resources and Engineering Beijing 102249 China

Managing lost circulation has always been a serious challenge in the oil industry. This situation becomes further complicated when shale formation is involved. Particulate lost circulation materials (LCMs) have been used to prevent the drilling fluid from entering fractured, cavernous, or high-permeability formations for many years. However, existing LCMs are inefficient in terms of size and application methods in solving severe-to-total losses in shales due to the uncertainty of particle size distribution (PSd) in drilling fluids. This study focuses on an experimental method optimizing the PSd of solid particles in the drilling fluid at high temperature and pressure. An orthogonal experiment of L9 (3)4, including four factors and three levels, was designed to investigate the relationship between the PSd of solid particles and filtration loss. results indicate that the orthogonal design method contributes to the optimization of the PSd of solid particles in the drilling fluid and reduce the test time and experimental workload during the drilling fluid process in the design stage. In addition, a polynomial relationship between the cumulative filtration loss and d90 or d50 is verified experimentally in this study. This study will remarkably benefit the drilling technologists in resolving the issue of lost circulation.

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A coupled flow-stress-damage explicit integration numerical model of wellbore fracturing based on finite-discrete element method in natural fractured shale gas reservoir 54

A coupled flow-stress-damage explicit integration numerical ...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Zhu, Haiyan Tang, Xuanhe Li, Yang Wang, Xiangyang Fan, Yu Zhou, Nayun dusseault, Maurice B. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Chengdu China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan China School of Mechatronic Engineering Southwest Petroleum University Chengdu China Geothermal Energy Research Center Southwest Petroleum University Chengdu China CNPC Engineering Technology R and D Company Limited Beijing China Shale Gas Research Institute PetroChina Southwest Oil and Gas Field Company Chengdu China Department of Earth and Environmental Sciences University of Waterloo WaterlooON Canada

To investigate the fracture propagation near the wellbore in natural fractured gas shale, a traction-separation relation is proposed and incorporated with the finite-discrete element method (FdEM) model. In the FdEM, shale matrix is discretized by triangular solid elements and zero-thickness cohesive elements, and solved with explicit temporal integration scheme. This methodology enables hydraulic fractures to propagate at an arbitrary direction. The traction-separation relation combines linear hardening process and non-linear softening process to describe the cohesive element damage evolution. Besides, Coulomb's friction law was employed to describe the interaction between fracture surfaces. Based on the FdEM numerical model with the field data, some conclusions can be drawn as: (1) As the hydraulic fracture propagating to the natural fracture, an alternative cracking appears between two different branches of natural fracture due to normal stress difference;(2) A higher horizontal principal stresses difference restricts hydraulic fracture re-orientation and intersection with natural fracture;(3) A smaller stress evolution is affected by the geomechanical heterogeneity;(4) a smaller intersection angle is easier to induce the hydraulic fracture re-orientation;(5) multi-clusters hydraulic fractures are prone to attract and intersect with each other and generates a main hydraulic fracture. © 2020 ArMA, American rock Mechanics Association

关键词： Fracture

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Analyses of mechanical conditions and affecting factors for forming micro-annuli in a casing-cement-formation system 52

Analyses of mechanical conditions and affecting factors for ...

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52nd U.S. rock Mechanics/Geomechanics Symposium

作者： Chen, Zhaowei dai, Caili Liao, Maolin CNPC Engineering Technology R and D Company Limited Beijing China Beijing China

Micro-annuli existing on the interface of cement-sheath might lead to the failure of wellbore integrity. Based on the solutions of the elastic and elastic-plastic deformations of a thick-walled cylinder with the internal and external pressures;meanwhile combining with the displacement continuity, a nonlinear equation set about the interfacial pressures and displacements of a casing-cement-formation system in the loading and unloading processes is established. Via solving the nonlinear equation set, the interfacial pressures and the displacements can be obtained. If the obtained interfacial pressure is larger than the bonding strength of rock, micro-annuli appear on the interface, and its size is equal to the difference of the interfacial displacement in the loading process and that in the unloading process. Numerical examples show that the micro-annuli are at an order of tens of micrometers. Moreover, as the increase of the elastic modulus of cement, the micro-annuli become broader. As a comparison, if the uniaxial compressive strength of cement increases, the micro-annuli become narrower. Therefore, to avoid the generation and development of micro-annuli, it is suggested that the cement with high uniaxial compressive strength and low elastic modulus should be used for the field practices. Copyright © 2018 ArMA, American rock Mechanics Association.

关键词： Cements

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Measurement while drilling of downhole engineering parameters by application of a newly designed micro-measurer

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Petroleum Science 2025年

作者： Yu-Xi Wang Mu Li Mao-Lin Liao Wei Liu Ting-rui Li Joseph Páez Chávez Gong-Hui Liu Jun Li Sheng-Lian Yao School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Downhole Intelligent Cybernetics Institute University of Science and Technology Beijing Beijing 100083 China CNPC EngineeringTechnology R&D Company Limited Beijing 102206 China School of Petroleum Engineering China University of Petroleum Beijing 102249 China Center for Applied Dynamical Systems and Computational Methods (CADSCOM) Faculty of Natural Sciences and Mathematics Escuela Superior Polit´ecnica del Litoral Guayaquil P.O. Box 09-01-5863 Ecuador Center for Dynamics Department of Mathematics TU Dresden Dresden D-01062 Germany School of Mechanical and Energy Engineering Beijing University of Technology Beijing 100124 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

As the well drilling depth has broken through the 10,000-meter in China, accurate measurements of downhole engineering parameters, such as annulus temperature and pressure for the whole wellbore, are significant in controlling potential downhole complexities. In this present work, a new micro-measurer is developed by integrating measurements of downhole temperature, pressure, magnetic field strength, and its own dynamic signals. The micro-measurer can flow with drilling fluid from the drillstring to the bottomhole and then float up back to the ground via the wellbore annulus. Compared with other downhole measurement tools that are fixedly connected to the drill string, its ”measure-and-move-on” approach reduces the residence time in the high-temperature and high-pressure zone at the bottomhole; moreover, both the pressure and temperature at different well depth can be measured, thereby the temperature and pressure profiles of the whole wellbore can be constructed. In addition, the bluetooth low energy (BLE) technique is applied to offer the micro-measurer with the capability of wireless information transmission; while hydrodynamic optimization of the micro-measurer is carried out to design the structure of the micro-measurer, which can promote its recovery rate from downhole. In addition, an intelligent joint for releasing micro-measurers from the wellbore annulus is also proposed, aiming to overcome the limitation imposed by the nozzle on the size of the micro-measurer. Both the indoor experiments and the field tests have verified the feasibility of the newly designed micro-measurer, which is a key step for establishing a complete downhole internet of things (IoT) system to serve the intelligent drilling in the future.

关键词： Measurement of temperature and pressure profiles MEMS sensor Time-depth conversion downhole Internet of Things

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A Seepage mathematical model for fractured wells of coalbed methane reservoirs and the corresponding pressure response feature

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IOP Conference Series: Earth and Environmental Science 2021年第2期714卷

作者： Chunchun Liu Cong Zhang Yanmei Xu Xinrui Cui Weigang Huang Aigu He Xiangyan Wang Yishan Liu Jigang Wang Shanxi CBM Exploration and Development Branch PetroChina Oilfield Company Shanxi Jincheng 048000 China Research Institute of Petroleum Exploration and Development Beijing 10083 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

Coalbed fracturing is one of the important engineering and technical means of coalbed methane stimulation. To establish the seepage model of coalbed gas fracturing well is the key scientific problem to effectively evaluate the fracturing effect. Therefore, based on the micro pore structure of coalbed methane, this paper constructs the physical model of three porosity and two permeability, the mathematical model of seepage and the mathematical model of bottom hole pressure response, and analyzes the key factors affecting the dynamic response characteristics of pressure. The results show that diffusion coefficient, channeling coefficient, reservoir volume ratio and conductivity have different effects on the bottom hole pressure of the vertical well of three hole and two permeability fracturing. The results of this paper have certain guiding significance for the drainage and production capacity prediction of coalbed methane.

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A Novel data Mining Approach in Preventing Casing damage of Oil Production Wells

A Novel Data Mining Approach in Preventing Casing Damage of ...

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IEEE Eurasia Conference on IOT, Communication and engineering (ECICE)

作者： Chaodong Tan Hua Wu Jiankang Liu Wei Yan Jingen deng Yanlong Zhang Qing Tang Hongguang Bu China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Dagang Oilfield Production Technology Research Institute Tianjin China

ISBN: (纸本)9781728125022

Because casing repair is expensive and the repair technology is not mature enough. Therefore, it is necessary to identify the casing damage risk well in advance and formulate effective casing damage prevention measures. In this paper, XGBoost and LightGBM machine learning algorithms are used to establish the casing damage prediction model for oil production wells. Taking the factors of dynamic production pressure difference and other factors leading to the casing damage of the production layer as input parameters and casing damage as the output parameter, a data set of 653 samples is established. The data set is split into a training set (80%) and hold-out set (20%).In the hold-out set, the casings of 111 production layers were not damaged. The hold-out set contains data corresponding to 131 production layers. Among them, 17 production layer casings were damaged, and the model predicted 13. The other 114 without casing damage are predicted correctly. The overall prediction accuracy is 96.9%. The main controlling factor of casing damage is production pressure difference. The casing damage prediction model is used to analyze the parameter sensitivity, optimize operation parameters such as production pressure difference, and reduce the casing damage probability of the oil production well.

关键词： Casing damage prevention Operation parameters optimization XGBoost LightGBM Casings Oil well production repair technology PrOdUCING FOrMATION Parameter sensitivity data mining dataset differential pressure Prediction models damage prevention damage probability

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