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2025 SPE/IAdC International drilling Conference and Exhibition, dC 2025

作者： Mahjoub, M. Nguyen, K.-L. dao, N.-H. Menand, S. Endres, L. Cheng, C. Mada, H. Feng, X. Sun, J. Helmerich & Payne Villeurbanne France Helmerich & Payne HoustonTX United States CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Ltd. Beijing China

ISBN: (纸本)9781959025641

Studies indicate that the interaction between the drill bit and rock formations induces vibrations along the bottom hole assembly (BHA). Parameters such as weight on bit (WOB) and rotation speed affect the engagement of the cutters in the rock, otherwise known as depth of cut (dOC). dOC is crucial for bit stability;a poor BHA design combined with a suboptimal choice of dOC can lead to axial, torsional, and lateral instabilities (bit bounce, stick-slip, and bit whirling phenomena). Optimizing the bit design to address these vibrations is vital for improved drilling performance. Both experimental studies in the lab and numerical simulations are essential tools to test and improve bit design before real-world drilling. In this work, a transient bit-rock interaction model is implemented to study the evolution of cutting and friction forces on each individual cutter, whether it is a cylindrical or shaped cutter. Specific models are introduced based on laboratory scratch tests, where the performance of each shaped cutter type is related to its main geometrical characteristics. These elementary forces are combined to provide the overall response of the bit. It accounts for axial, torsional, and lateral motions of the bit as well as the possible transition between different rock layers that generally trigger bit instability. This model is coupled with a time-domain dynamics model of the drill string to examine the implications of the cutting process on the BHA vibration. Experimental lab data on a drill bit are used as a basis to calibrate the model. The experimental measurements are then complemented with the simulation results to have an in-depth understanding of the bit behavior. Comparisons of lab and simulation results showed a good agreement for WOB, torque on bit (TOB), and lateral acceleration. Based on these results, the numerical simulations allowed investigation of the cutter elementary forces, ranking them in terms of work rate and durability. Moreover, the simu

关键词： Stick-slip

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Solving Method for Three-dimensional Circular Arc Well-Path Planning Model 11th

Solving Method for Three-Dimensional Circular Arc Well-Path ...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Tang, Xue-ping Hong, di-feng Su, Yi-nao Gao, Wen-kai Teng, Xin-miao CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789811921483

In order to solve the three-dimensional circular arc well-path planning model simply, effectively and accurately, two typical models of three-section and five-section well-path and their parameter combinations are discussed. Based on the analytical formula of the three-section model, the algorithms for solving various combinations are given. By analyzing the five-section model, a nonlinear constraint equation with 7 design parameters is obtained, which proves that only some combinations have analytical solutions, and then suitable solution methods are selected for different combinations. In order to solve the problem of nonlinear constraint equations, it is proposed that an accurate solution method for three-dimensional well-path planning model combined with analytical and piecewise iterative method, and the algorithm flows of typical parameter combinations are proposed, which satisfies the problem of solving three-dimensional well-path planning model. Using the model and the solving method in this article, the three-dimensional well-path design software is developed, which has been applied in the Venezuelan MPE-3 block development program and the extened-reach cluster horizontal well plans of the 8th platform in Zhuanghai block of dagang field in China. It can satisfy the requirements of the three-dimensional well-path planning for various types. It is proven that the solving method in this paper is simple, effective, fast, accurate, easy to program, and has application value in the design of directional wells and horizontal wells. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Three dimensional computer graphics

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A New Mathematical Model to Calculate the Multi-Layer Fracture Conductivity

A New Mathematical Model to Calculate the Multi-Layer Fractu...

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2024 SPE Gas and Oil technology Conference, GOTECH 2024

作者： Hou, Tengfei Shang, Litao Wang, Yehan Xiao, Cong Chen, Weihua Zhang, Yang Zhang, Shiling Liu, Fei ren, Guangcong CNPC Engineering Technology R&D Company Ltd Beijing Beijing China China University of Petroleum Beijing China Engineering Technology Research Institute PetroChina Southwest Oil and Gas Field Company China

ISBN: (纸本)9781959025405

Unlike conventional oil and gas reservoirs, shale reservoirs develop a variety of weak structural planes, including structural fractures, interlayer bedding fractures, bedding slip fractures and abnormal pressure fractures. These weak structural planes affect the morphology of artificial fractures during volume fracturing, especially the propagation of fracture height. However, for the coexistence of horizontal and vertical fracture case, the existing models fall short in accurately predicting proppant embedment and fracture conductivity. In this study, new mathematical models are conducted to evaluate the proppant embedment and the complex fractures conductivity coupled with horizontal and vertical fractures. Taking the stimulated volume covered by horizontal and vertical fractures as a whole, we utilize the Carman-Kozeny equation to estimate the permeability of the primary fracture, and the monolayer proppant laying model was employed to forecast the permeability of each branch fracture. Then, the combined permeability is calculated by using darcy's Law under the condition of multiple fractures flowing in parallel pattern. Furthermore, we apply particle deformation and creeping deformation models to assess the temporal evolution of complex fracture conductivity. Compared with previous mathematical models, the biggest difference of this model is that it needs to consider the number of vertical fractures and horizontal fractures and the proportion of flow rate. Factors influencing the development of proppant embedment and complex conductivity, including number of branch fractures, closure pressure, elastic-plastic properties, proportion of flow rate are investigated. This study also examines the steady state of conductivity. The findings show that our proposed analytical model aligns well with experimental observations, thereby validating its accuracy and applicability. The fracture conductivity is directly proportional to number of branch fractures, elastic-plastic

关键词： Sensitivity analysis

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Characteristics of conicl diamond tooth for breaking hard rock under vibratory percussion 57

Characteristics of conicl diamond tooth for breaking hard ro...

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57th US rock Mechanics/Geomechanics Symposium

作者： Ji, ran Shi, Huaizhong Sun, Zhaowei Chen, Han Xiong, Chao Song, Hengyu China University of Petroleum - Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

The application of conicl PdC teeth to vibratory percussion drilling technology is expected to break deep hard rock efficiently and improve drilling efficiency. In this paper, the characteristics of conicl diamond tooth cutting and hard rock under percussion are investigated. Firstly, experiments on percussion compression of conicl diamond tooth into the broken rock were carried out to analyse the percussion energy and the characteristics of rock crushing pits. Secondly, a numerical model of the cutting process of conicl diamond tooth under the vibratory percussion was established. Three stages of rock-breaking by conical tooth cutting under high frequency number percussion are analyzed. Stress peaks with percussion of 6 times increased by 36.8% and 25.5% compared with percussion of 0 times and percussion of 3 times. There is the highest point of rock-breaking efficiency between percussion of 3 times and 4 times. Cutting force with percussion amplitude of 1.5mm increased by 42.7% compared with percussion amplitude of 0mm. The rock-breaking specific energy with percussion amplitude of 1.5 mm increased by 32.4% compared with percussion amplitude of 0 mm. This study provides a theoretical basis for the use of conical tooth in PdC drill bits under percussion. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： rocks

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Practice and Application of Managed Pressure drilling technology in Block B, Amu darya 13th

Practice and Application of Managed Pressure Drilling Techno...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Liu, Ji-Tong Liu, Yu-Han Cheng, Wei-Heng Gu, Yi-Xin Xiao, Yue Jiang, Fu-Hua Li, Bing-rou Zhou, Liang CNPC Engineering Technology R&D Company Limited Beijing China AM River Natural Gas Company Beijing China College of Petroleum Engineering China University of Petroleum Beijing China

ISBN: (纸本)9789819702558

Block B of the Amu darya in Turkmenistan has complex geological conditions and fractured carbonate reservoirs. Narrow safety density window caused complete loss of circulation and frequent blowout occurred frequently. The simultaneous loss and kick seriously affect drilling safety, which cause prominent serious reservoir pollution and high well risk, and slow the drilling speed, which caused long drilling cycle and high cost, and seriously restrict the process of exploration and development. The application of managed pressure drilling technology effectively solves the above problems. This paper focuses on introducing the adaptability, countermeasures and application of managed pressure drilling technology in B block on the Amu darya right bank. The application of precise managed pressure drilling technology in the Karloff-Oxford target layer of Well W-22 and Well M-21 effectively controlled the pressure profile of wellbore liquid column, achieves the purpose of efficient and safe drilling, reduces the leakage of various types of slurry and reduces the pollution of production layer. The application results show that the managed pressure drilling technology can adapt to the demand of narrow density window of drilling of the Amu darya right bank in Turkmenistan, which can effectively reduce the impact of downhole complexity on drilling operations such as overflow and leakage, reducing the loss of non-production time, facilitate the discovery and protection of reservoir oil and gas, and provide a technical means for the safe drilling of fractured narrow density window of oil and gas reservoirs. This technology has the conditions for large-scale industrial application. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Infill drilling

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A Three-dimensional Model for the Formation Pressure in Wellbores under Uncertainty

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Fluid dynamics & Materials Processing 2023年第9期19卷 2305-2314页

作者： Jiawei Zhang Qing Wang Hongchun Huang Haige Wang Guodong Ji Meng Cui Hongyuan Zhang Strategic Planning and Technical Support Institute CNPC Engineering Technology R&D Co.Ltd.Beijing102206China

Formation pressure is the key parameter for the analysis of wellbore *** increasing drilling depth,how-ever,the behavior of this variable becomes increasingly *** this work,a 3d model of the formation pres-sure under uncertainty is *** a relevant algorithm is ***,the logging data of regional key drilling wells are collected and a one-dimensional formation pressure proﬁle along the well depth is ***,a 3d model of regional formation pressure of the hierarchical group layer is deﬁned by using the Kriging interpolation algorithm relying on a support vector machine(SVM)and the formation pressure of the drilled *** validate the method,the formation pressure of one pre-drilled well is compared with the well logging *** comparison reveals that the maximum relative error is less than 4.5%.The software based on this model is complemented by a computer visualization technology,which provides a relevant tool for under-standing and analyzing the 3d formation *** outcomes of this study are intended to support the char-acterization of areas with missing or poor 3d seismic data and provide more accurate information for the analysis of wellbore integrity.

关键词： Formation pressure with uncertainty well integrity kriging interpolation 3d pressure body

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Experimental research regarding the Flow Pattern and Pressure drop in a Slurry Composed of Polypropylene-Particles 9

Experimental Research Regarding the Flow Pattern and Pressur...

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9th International Conference on Advances in Machinery, Materials Science and engineering Applications, MMSE 2023

作者： Fan, Jinchao Xu, Zhaohui Fang, Chao Lin, Zili Cnpc Engineering Technology R&d Company Limited China National Engineering Research Center for Oil and Gas Drilling and Completion Technology China

ISBN: (纸本)9781643684383

Pipelines used for product transportation require regular cleaning. A new method has emerged using slurry for the cleaning process, during which the flow pattern and pressure drop in the slurry are essential. The flow of slurry containing polypropylene particles was investigated using a laboratory-scale, closed-circuit pipeline facility. While the slurry was pumped, the pressure drop was measured, and the flow pattern was observed regarding particle type, slurry particle concentration, and slurry flow velocity. The results showed that after the critical flow velocity, the particles mixed uniformly with the water in the pipe, increasing the pressure drop in conjunction with the flow velocity. Although a higher particle mass fraction and small particle size reduced the critical flow velocity, the mass fraction and particle size had no significant influence on the pressure drop. This research establishes a solid foundation for the practical application of this cleaning method. © 2023 The Authors.

关键词： Flow patterns

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development of a Wellbore Stability Prediction Model Using Multiple regression with Missing Core Samples: A Case Study of the Shunbei Oil and Gas Field 57

Development of a Wellbore Stability Prediction Model Using M...

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57th US rock Mechanics/Geomechanics Symposium

作者： Chang, Qifan Fu, Yun Zhou, Yitian Zheng, Lihui Li, Jie Jin, Yi China University of Petroleum Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

The Shunbei oil and gas field, characterized by its intricate deep fault-karst reservoirs and fractured carbonate lithology, presents formidable challenges to wellbore stability during drilling and completion phases, precipitating adverse events such as wellbore collapse and fluid loss. This study embarks on addressing the paucity of data integral for effective wellbore stability prediction in this region, employing a tripartite methodological approach: identification of pertinent data and influential factors, enhancement of multiple regression accuracy, and selection of controlling factors. The study revealed that the multiple linear regression model delivered the most precise predictions for both the leakage rate and well diameter expansion rate. Crucial factors such as geodetic coordinates, drilling pressure, and azimuth were identified as exerting substantial influence on wellbore stability. By scrutinizing primary controlling factors and underscoring the crucial role of drilling pressure and displacement in averting collapse and leakage, this study provides invaluable insights applicable to actual production settings. This study, while enhancing understanding of wellbore stability through analyzing key factors, does not delve into quantitative control strategies. Nevertheless, it provides a practical framework for better management of wellbore collapse and leakage in Shunbei oil and gas field. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Lithology

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dolomitization Model of Pelletoid of Arab C Formation in Southern Arabian Gulf 84

Dolomitization Model of Pelletoid of Arab C Formation in Sou...

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84th EAGE Annual Conference and Exhibition

作者： Li, F. Ye, Y. Li, L. Wan, Y. Research Institute of Petroleum Exploration and Development Petrochina China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781713884156

dolomitization is the main geological process that turn pelletoid into dolomites. How does dolomitization convert pelletoid into dolomites? Why do dolomites have different structures and crystals? This paper mainly answers these two questions. Based on core, cast thin sections, physical property and mercury intrusion, the Pelletoid types are first determined. Secondly, the diagenesis of the Pelletoid is comprehensively recognized, including the diagenetic types, diagenetic environment and diagenetic product. Finally, the dolomitization model of Pelletoid is established. There are four types dolomite in Arab C formation in BH oilfield. The Arab C Formation was in a tidal flat environment, in which facies include supratidal, intertidal and subtidal. different facies have different water energy, lithology, exposure probability and time, as a result, the diagenesis such as gypsification, dolomitization, dissolution and cementation in different area vary greatly. That’s why there are four type of dolomite even the primitive particles are the same pelletoids. The pelletoids were mainly in the intertidal facies, subtidal facies with relatively high energy could also developed. Intertidal facies was easy to exposure, and gypsification and dolomitization was intense in penecontemporaneous stage. due to the environment difference, response to sea level fluctuation and exposure time, the diagenesis, especially the extent of dolomitazition is different. As a result, the dolomite has different character in structure and crystal. © (2023) by the European Association of Geoscientists & Engineers (EAGE). All rights reserved.

关键词： dolomite

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New Understanding of Matrix-Fracture dual Media reservoir damage Based on Pressure-Controlled Fracturing 58

New Understanding of Matrix-Fracture Dual Media Reservoir Da...

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

作者： Zhang, Yang Qiao, Yan Zhang, Shiling Wu, Hongjun Bai, Jie Guo, Xudong Li, Senmu CNPC Engineering Technology R&D Company Limited BeiJing China Research Institute of Petroleum Exploration & Development BeiJing China PetroChina Tuha Oilfield Company HaMi China

ISBN: (纸本)9798331305086

The Tarim Oilfield Krasu tectonic zone is deeply burial, high temperature, low porosity and permeability, and constitutes the complex matrix-fracture dual media seepage channels. reservoir damage evaluation for such reservoirs is important for subsequent development. In this study, we firstly processed the fracture network in the reservoir core by controlled-pressure fracturing to improve the fracture tortuosity, and verified the reasonableness of this method by CT scanning and shape factor calculation. Then, based on the dual-media condition, we establish the water/oil-lock damage evaluation method, the stress-sensitive evaluation method, the fluid-sensitive evaluation method, and the in-well fluid damage evaluation method. Based on the above methods, the sensitivity of matrix-fracture dual-media reservoirs is moderately strong for water-oil locking, stress, and fluid salinity, moderately weak for liquid alkalinity, weakest for liquid flow rate. In-well fluid damage replacement experiments show that reservoir damage caused by first contact is the most important factor of reservoir damage during the whole process of drilling-completion-reconstruction. For deep tight reservoirs, fracturing fluid is easy to cause serious reservoir damage, and it is necessary to pay attention to reservoir protection during fracturing in low-yield blocks. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Fracturing fluids

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