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57th US rock Mechanics/Geomechanics Symposium

作者： Junlong, Chen Xueping, Tang Xinmiao, Teng Wenkai, Gao CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

It is necessary to take some activities to correct the well-trajectory when it deviated from the designed well-path for the complex structural wells. In order to reduce the deviation from the planned well-path, we proposed a path following algorithm by backstepping method. The relative distance between the bit and planned well-path was calculated by the true vertical depth (TVd). The first and second order differential equations of the offset were established as the control function. Lyapunov function was constructed not only to verify the global consistent asymptotic stability of the system but also form a build-up rate control method. When the deviation between the real drilling trajectory and the planned well-path has exceeded the allowable threshold value, the algorithm automatically calculates the relative distance and angle, analyses and send the optimal strategy to the steering tools. The results show that the above algorithm can quickly track the designed well-path and ensure to avoiding oscillation. This method can be used in the future downhole closed-loop system. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Lyapunov functions

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development of Underground Electro-motor development of a New downhole Electro-motor 12th

Development of Underground Electro-motor Development of a Ne...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Wang, Ai-Guo Han, Fei Wang, Hong-Wei Chen, Lang-Yi CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819919635

In recent years, some new downhole motors have emerged one after another, such as high-torque high-speed positive displacement motor, long-life turbine motor and downhole electro-motor, which provide supplemental driving forces to the petroleum drilling. different from conventional turbine motors and screw motors, the downhole electro-motor uses the electro-motor to directly drive the bit to break the rock, and it transmits power and information through the wireline drill pipe. With the feature of infinitely adjustable rotating speed, it can realize real-time optimization of parameters (e.g. rotating speed, WOB and flow rate). It is applicable to diverse circulation media including oil-based mud, waterbased mud, foam, air, and nitrogen. Moreover, it can realize high-capacity twoway communication at high speed, and be capable of measurement/monitoring while drilling. This paper presents the design, in-plant test and pilot well test of a new downhole electro-motor. This new downhole electro-motor was tested in 150 m drilling. Through the test, it is verified that the new downhole electromotor is capable of actual drilling, with the rotating speed and torque adjustable infinitely in real time, and the maximum communication rate of 156 kbps. The new downhole electro-motor is energy-saving and efficient, and provides a new technical platform for automatic and intelligent drilling. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Permanent magnets

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Preparation and characterization of supramolecular gel suitable for fractured formations

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Petroleum Science 2023年第4期20卷 2324-2342页

作者： Jing-Bin Yang Jin-Sheng Sun Ying-rui Bai Kai-He Lv Jian Li Mei-Chun Li Yue-Cheng Zhu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China CNPC Engineering Technology R&D Company Limited Beijing102206PR China

The excellent mechanical properties of supramolecular gel could adapt to the complex reservoir environment and had broad application prospects in the field of oil and gas drilling and production *** this paper,a supramolecular gel based on hydrophobic association and hydrogen bonding was prepared by micellar copolymerization,which could be used to plug fractures and pores in *** gel was a gel network system with high performance characteristics formed by self-assembly of non-covalent bond *** rheological properties,mechanical mechanics,temperature resistance and swelling ability of supramolecular gel were *** results showed that the supramolecular gel had a dense three-dimensional network structure with open and interconnected pore structures,which could exhibit good rheological properties and strong viscoelastic recovery *** mechanical properties of the supramolecular gel were excellent,it had a tensile stress of 0.703 MPa and an elongation at break of 1803%.When the compressive strain was 96%,the compressive stress could reach 14.5 *** gel also showed good temperature resistance and swelling *** the aging temperature of 135℃,supramolecular gels still maintained good gel strength,and it only took 12 h to reach the equilibrium swelling ratio of 35.87 in 1%NaCl *** was also found that supramolecular gel in low concentration saline(1%NaCl solution)showed relatively faster swelling than high concentration saline(25%NaCl solution).The swelling process of the supramolecular gel was non-Fick diffusion(typeⅡ).This indicated that the organic/inorganic permeability network was well ***,the diffusion rate of small molecules could be guaranteed to be equal to the relaxation rate of large molecules before and after the phase transition *** addition to the diffusion of water molecules,the swelling process of the supramolecular gel was also affected by the relaxat

关键词： Supramolecular gel Non-covalent interaction rheological mechanics properties Swelling kinetics Plugging ability

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Study and application of rock breaking by PdC bit in ultra deep in-situ high-temperature and high-pressure environment 57

Study and application of rock breaking by PDC bit in ultra d...

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57th US rock Mechanics/Geomechanics Symposium

作者： Chen, Changchang Ji, Guodong Zhang, Hongyuan Sun, Yuqi Wu, Qiang Jiang, Haichao CNPC Engineering Technology R&D Company Limited Beijing China CNPC Bohai Drilling Engineering Company Limited Tianjin China

ISBN: (纸本)9780979497582

The finite element model of the cutting tooth rock system based on ABAQUS is established by using the grid adaptive method. The average stress of each node of the cutting tooth is solved by using the secondary development of PYTHON language, and the rock breaking efficiency, real stress distribution and the influence laws of temperature and pressure of different cutting tooth shapes and rock samples are obtained. A super deep PdC bit with special non plane teeth is optimized and designed, which has achieved good results in the southern edge of Xinjiang. The research shows that the mechanical parameters of the rock change obviously under the high temperature and high pressure environment. The micro damage structure that is conducive to rock breaking by the bit is produced under the high temperature. The rock breaking efficiency is negatively related to the temperature due to the transformation of the rock from brittleness to plasticity under the high confining pressure. The double row structure of axe shaped teeth and cone shaped teeth has the best rock breaking effect under the ultra deep high temperature and high pressure environment. The drill bit footage is the longest. The problem of bit shoulder collapse is prominent under the ultra deep in-situ environment, The design of different rail double row teeth should be adopted, the design of bit stability should be strengthened, and the drilling parameters with large WOB, low speed and large displacement should be adopted. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： rocks

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Latest Technological Progress in drilling and Completion Operations of the Unconventional reservoir in Xinjiang MaHu Oil Field and Key Suggestions for the Next Steps

Latest Technological Progress in Drilling and Completion Ope...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Hu, Huaigang Xi, Chuanming Ji, Guodong Zhang, Nan Wu, Qiang Zhuo, Lubin Zou, Lingzhan CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil Gas Drilling and Completion Technology Beijing China Xinjiang Oilfield Engineering Technology R&D Company Limited Karamay China

ISBN: (纸本)9781959025436

due to the differences in sedimentary environments, compared with the exploitation of unconventional oil and gas resources in the United States and other countries, China has encountered greater difficulties in the drilling and completion processes of unconventional oil and gas. By analyzing the problems faced by drilling and completion in unconventional reservoirs in the MaHu area in recent years, the process of solving the issues and technical progress are summarized to form a technical template for drilling and completion in this area, which can also provide references for the next step to improve the drilling efficiency and reduce development costs. By studying the lateral distribution law of the pore pressure, the placement of the technical casing was optimized to further develop a standard design for the wellbore structure applicable to this area. To adapt to the local environmental protection requirements, high-performance non-sulfonic treatment agents were selected to replace sulfonic treatment agents, and four sets of environmental protection drilling fluid systems were formed. Based on the rock mechanics and field tests, the personalized drill bit is continuously optimized. With the introduction of a rotary steering drilling system and high-performance positive displacement motor (PdM), the rate of penetration (rOP) has been greatly improved. The transformation of horizontal Wells in the target Triassic formation from four types of casing strings with open hole completion + White oil-based/potassium-calcium based polysulfone organic salt drilling fluid to three types of casing strings with 5-inch casing completion + white-oil/potassium-calcium polyamine organic salt drilling fluid, from conventional rotary drilling + roller cone bit to rotary steering system/high-performance PdM +PdC bit, and the horizontal section length increased from 2000m to 2650m. Completion time decreased from an average of 144 days to 72 days. Speak of the Permian formation, the tra

关键词： Oil well completion

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research on the Correlation Analysis Between Logging Parameters and rock drillability Based on random Forest 6

Research on the Correlation Analysis Between Logging Paramet...

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6th International Conference on Frontier Technologies of Information and Computer, ICFTIC 2024

作者： Lv, Congyue Zhao, Fei ding, Yan Cui, Yi Gao, reyu Wang, Ge Tian, Yumeng Jia, Wenting Lin, Boyang Li, Linfeng Cnpc Engineering Technology R&d Company Limited Beijing China College of Petroleum Engineering Beijing China

ISBN: (纸本)9798331541750

The rock drillability grade value is a comprehensive parameter that measures the ease or difficulty of rock fragmentation during drilling. determining this parameter is crucial for guiding bit selection and predicting drilling speed. There exists a strong correlation between certain logging parameters and the rock drillability grade value. To explore this correlation, a common practice is to use the Pearson correlation coefficient method, which mainly investigates the linear relationship between variables. However, relationships among complex formation characterization parameters are often nonlinear. To evaluate the pros and cons of the two analytical methods when dealing with nonlinear and complex data, a comparison was made, and the random forest algorithm was preferentially selected as the analytical tool to enhance the precision of the prediction model. Thus, this paper analyzes the correlation between logging parameters and the rock drillability grade value based on Pearson correlation analysis and the random forest algorithm. Using the Matlab programming language, logging parameter correlation analysis software named Correlation 1.0 was developed. The random forest algorithm was preferred to screen out logging parameters with high correlation to the drillability grade value (drilling depth and formation density), providing a new approach for establishing a high-precision formation rock drillability model. © 2024 IEEE.

关键词： rock drills

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research on Flow Field Characteristics Measurement in Variable Cross-Section Annulus Using Particle Image Velocimetry (PIV)

Research on Flow Field Characteristics Measurement in Variab...

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2024 SPE Gas and Oil technology Conference, GOTECH 2024

作者： Zhou, Y.S. Qu, C.F. Zhang, H.W. Zhang, H. Jiang, L. Liu, Z.S. Shen, J.Y. Zhang, Z.Z. Zheng, r. CNPC Engineering Technology R&D Company Limited China China University of Petroleum Beijing China

ISBN: (纸本)9781959025405

The actual downhole annulus is irregular, a variable cross-section geometry, due to the difference between the diameter of tool joints, tubing collars or downhole tools and the inner pipes. With the increasing of well depth, it is difficult to predict the annulus pressure loss accurately due to the effect of variable cross-section geometry. research on flow field characteristics in variable cross-section annulus is the theoretical foundation of accurate prediction on annulus pressure loss. However, there is still few research on flow field characteristics in variable cross-section annulus by experiment, especially by using PIV technology. PIV has become an efficient method for complex flow field visualization and analyzation. The results show that there is separated reattachment flow in the irregular annulus which mainly occurred in the downstream of the expansion. The separated reattachment flow has low velocity, but vortex mainly occurred in this area. The disturbance range of streamlines caused by expansion structure is shorter in the upstream than in the downstream. The first and second modes contain 82% energy contribution in the irregular annular flow field. And the first mode can effectively restore the large-scale structure. With the mode increases, it is found that the small-scale structure is mainly distributed in the shear layer of the separated and reattached flow downstream of the variable cross- section geometry. © 2024, Society of Petroleum Engineers.

关键词： Flow fields

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Experimental Study on Hydraulic Fracture Propagation Mechanism of Water Injection Propagation in Super deep Fracture-Cavity Carbonate reservoir 13th

Experimental Study on Hydraulic Fracture Propagation Mechani...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Sun, Xun Liu, Jiangyu Jin, Yi ren, dengfeng Zhang, Yang Shang, Litao Bai, Haoli Wu, Xi CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Tarim Oilfield Company Korla China

ISBN: (纸本)9789819702596

The super deep fracture-cavity carbonate reservoir in Tarim Basin has copious amounts of oil and gas, in which karst cave is the main reservoir space. It is necessary to communicate with karst cave through hydraulic fractures to realize efficient development due to the deep burial, poor physical properties, random distribution of natural fractures and caves, complex location relationship between wells and caves. Therefore, it is of great significance to study the hydraulic fracture propagation mechanism in fracture-cavity carbonate reservoir. In this research, a novel laboratory simulation method for water injection propagation was established based on true tri-axial hydraulic fracturing equipment. Using this method, the law of fracture connecting cave under different experimental conditions were analyzed, and the relationships between water injection volume and cave volume were clarified. The results show that: low stress difference, small included angle (between cave and horizontal maximum stress) and the use of temporary plugging agent have huge contribution to improve the number of caves that connected with hydraulic fractures;the critical turning condition of hydraulic fracture is sensitive to factors such as the position relationship of well and cave, horizontal stress difference and included angle. This study has certain theoretical guiding significance for fracturing design and water injection parameter optimization in fracture-cavity carbonate reservoir. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Fracture

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An intelligent algorithm for identifying dropped blocks in wellbores

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Natural Gas Industry B 2025年第2期12卷 186-194页

作者： Wang, Qian Yang, Zixuan Ye, Chenxi Zhai, Wenbao Feng, Xiao CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

real-time monitoring of wellbore stability during drilling is crucial for the early detection of instability and timely interventions. The cause and type of wellbore instability can be identified by analyzing the dropped blocks brought to the surface by the drilling fluid, enabling preventive measures to be taken. In this study, an image capture system with fully automated sorting and 3d scanning was developed to obtain the complete 3d point cloud data of dropping blocks. The raw data obtained were preprocessed using methods such as format conversion, down sampling, coordinate transformation, statistical filtering, and clustering. Feature extraction algorithms, including the principal component analysis bounding box method, triangular meshing method, triaxial projection method, local curvature method, and model segmentation projection method, were employed, which resulted in the extraction of 32 feature parameters from the point cloud data. An optimal machine learning algorithm was developed by training it with 10 machine learning algorithms and the block data collected in the field. The XGBoost algorithm was then used to optimize the feature parameters and improve the classification model. An intelligent, fully automated feature parameter extraction and classification system was developed and applied to classify the types of falling blocks in 12 sets of drilling field and laboratory experiments and to identify the causes of wellbore instability. An average accuracy of 93.9 % was achieved. This system can thus enable the timely diagnosis and implementation of preventive and control measures for wellbore instability in the field. © 2025 Sichuan Petroleum Administration

关键词： 3d scanning dropped block classification Feature extraction Machine learning Point cloud data Wellbore instability

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Maximising drilling rates with real-Time data-driven drilling Parameters Optimisation

Maximising Drilling Rates with Real-Time Data-Driven Drillin...

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2023 International Petroleum technology Conference, IPTC 2023

作者： Cui, Meng Ai, Xin Li, Jijun Liu, Wenpeng ding, Yan CNPC Engineering Technology R&D Company Limited China CNPC Daqing Exploratory & Drilling Engineering Company China

ISBN: (纸本)9781613998663

The hardness and high abrasiveness of shale formations pose great challenges for improving drilling performance with deeper and more complex unconventional gas-reservoir formations explored and developed in the Sichuan Basin of China. The work discussed a workflow of data-driven drilling-parameter optimization based on machine learning. The algorithm was used to construct the correlation among drilling parameters, lithology change, vibration, bit wear, and hole cleaning, dynamically optimize rock-breaking efficiency, and integrate with the rig control system. The data-driven drilling optimization workflow consisted of exploration mode, learning mode, and application mode. The exploration phase trained a linear model at a certain frequency during data collection and updates the increasing trend of rate of penetration (rOP) in real time after starting the workflow. Based on the trend, the direction for further exploration was given. The system entered the learning mode after sufficient exploration to learn the exact functional relationship between rOP/MSE (mechanical specific energy) and operation parameters in the current explored data queue. Current optimal operation parameters were presented based on the function relationship. Then the workflow entered the application mode, maintained the current optimal operating parameters, and kept the efficient rock-breaking state. The workflow constantly monitored the micro-interval rOP and bit energy output in the application mode. When drilling performance was under expectation, the workflow automatically evaluated new conditions (e.g., formation change, Bottom hole assembly (BHA) vibration, and cuttings bed) and switched to the learning mode or exploration mode to adapt to changes in the current drilling state. The algorithm has been integrated with the rig control system, and the field test was carried out in well Ning 209H71-3, a shale-gas horizontal well in the Sichuan Basin. The test showed that the random forest and su

关键词： Lithology

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