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

作者： Chen, Changchang Ji, Guodong Zhang, Hongyuan Sun, Yuqi Wu, Qiang Lv, Zehao CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9798331305086

Polycrystalline diamond Compact (PdC) bit underground operating conditions identification is one of the difficulties during the drilling operation. It is of great significant for the drilling improvement and accurate construction formation to accurately identify the complex operating conditions during drilling the operation such as PdC bit wearing and stick-slip vibration, etc. In this paper, data of relationship between torque, rate of penetration (rOP) signal and weight on bit (WOB), rev were obtained through lab simulation experiment, after which, a relationship database of torque, rOP signal and WOB, rev was established, a single-layer Long Short Term Memory (LSTM) recurrent neural network (LSTM) was constructed, the number of neurons, batch size and optimizer type of LSTM layer were optimized. With BPTT algorithm, LSTM model was trained and tested on the training set containing 6000 groups of data, and achieved the goal of identifying the bit operation conditions against the input of WOB, torque, rev and rOP signal parameters. Based on this model, the PdC bit underground operating conditions identification software was compiled, and was connected to the logging unit to realize real-time identification of bit underground operating conditions, and field test application was successfully carried out in Mahu 1 Well region. The research showed that the convergence speed was fast and the time cost was at the lowest when the number of neurons of LSTM model was 50, and that the optimized Adam optimizer model could meet the requirements of convergence speed and prediction accuracy with the lowest loss value. The classification accuracy of this model on the test set reached 94% and the accuracy of the prediction method was also verified by field test application. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Stick-slip

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Experimental Study on the Transmission Law of Ultrasonic in Mud 1

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhang, Shuo Gao, Wen-Kai Teng, Xin-Miao ding, Hua-Hua Liu, Ke Yu, de-Zhou CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (数字)9789819704798

ISBN: (纸本)9789819704781

In the process of oil and gas exploitation, the problems of wellbore instability and collapse seriously restrict the efficiency and safety of drilling and completion engineering. Ultrasonic borehole imaging technology while drilling has the advantages of accurately reflecting borehole shape, identifying fractures, pores, bedding and other characteristics. It can be used for real-time monitoring and evaluation of borehole engineering conditions and quality while drilling, which can effectively reduce drilling risks and costs, improve drilling efficiency and reservoir drilling rate. In order to develop ultrasonic borehole imaging tools while drilling and accurately interpret the ultrasonic images, this paper researches the transmission law of ultrasonic in mud, builds and designs the experimental device and experimental platform, formulate the experimental scheme. Laboratory simulation experiments were carried out to analyze the effects of different measurement distances, different mud density, different temperatures and different objects on the travel time and echo amplitude of ultrasonic and the main factors affecting the imaging effect. The experimental results show that: (1)The ultrasonic travel time increases linearly with the increase of measurement distance, increases with the increase of mud density, and increases slightly with the increase of transmission medium (water) temperature;(2) The ultrasonic echo amplitude decreases exponentially with the in-crease of measurement distance, decreases exponentially with the increase of mud density, and increases slightly with the increase of trans-mission medium (water) temperature;(3) Ultrasonic travel time information can be used for well diameter measurement and wellbore shape identification;(4) The ultrasonic echo amplitude information can be used to identify and image the characteristics of wall cracks, pores and holes;(5) Ultrasonic can be applied to the measurement and imaging of high density oil/water-based mud

关键词： Boreholes

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An Adaptative Well Trajectory Control Method for drilling Automation 57

An Adaptative Well Trajectory Control Method for Drilling Au...

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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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Practice and Exploration of data Governance for drilling Completion 13th

Practice and Exploration of Data Governance for Drilling Com...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jing, Ling-Zhi Cui, Meng Yang, Xin-Yi Tian, Yu-Meng Shi, Xiao-Yan CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702718

drilling and completion is the core of energy production and plays an irreplaceable role in improving oil and gas exploration and development and increasing crude oil recovery. Similarly, drilling data is of great significance in drilling optimization, perforation, hydraulic fracturing, and oil and gas production. However, in actual production, data quality and application often fall short, making it difficult to further enhance and optimize oilfield engineering technology. Therefore, effective data governance to address data quality and application problems has become an urgent and critical issue. Additionally, the scale, quality, complexity, and security of data are essential issues that must be considered in data governance processes. To address these issues, this paper proposes an engineering technology data governance approach covering data quality control, data standardization, data modeling, and data mining. These methods and tools have been applied in production practices, and have achieved good results. Additionally, this paper explores the application of intelligent data governance, which aims to quickly and efficiently manage data. This paper compares the advantages and disadvantages of existing data governance algorithms in data governance, providing reference application scenarios for more efficient, reliable, and accurate drilling data governance. In summary, the proposed data governance approach and techniques provide the foundation for further improvements in oilfield engineering technology and management, as well as enhancing data utilization and decision-making for the petroleum service industry. Effective methods and tools must be used to address the challenges of data governance, including data scale, quality, complexity, and security. The proposed data governance approach for engineering technology, along with its applications and exploration in intelligent data governance, provides significant support for the exploration and implementation of d

关键词： Quality control

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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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Early Stuck Pipe detection Based on Time Series Analysis

Early Stuck Pipe Detection Based on Time Series Analysis

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2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Shi, Xiaoyan Ji, Yong Cui, Meng Wu, dong Guo, Weihong Jing, Lingzhi Tian, Yumeng Yang, Xinyi CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025269

recognizing stuck pipe signs in an earlier time and adopting appropriate action can greatly reduce nonproductive time during drilling and improve drilling safety. The purpose of this paper is to propose a time series analysis approach and build a reliable and easy-to-use tool to automatically detect stuck pipe accurately and early. Based on the in-depth theoretical analysis and historical stuck pipe data analysis, main early stuck pipe indicators during different drill operations are identified. More than ten time series analysis algorithms and machine learning algorithms are utilized to capture subtle change trends and local change patterns in noisy real-time measured surface data during drilling, and a self-adaptive threshold value determination method is proposed to improve the detection accuracy under different data measurement quality. Moreover, correlation analyses are conducted on the multidimensional time series based on the studied rules and priori knowledge to reduce the false alarms caused by curtain drilling operations. An early stuck pipe detection software tool is built. The tool consumes both real-time and archived drilling data, and provides alarms when stuck pipe indicators are detected. 19 wells’ historical drill data are fed to the tool for algorithm verification, the results show that the tool can automatically detect all 22 stuck pipe incidents in the data set, among which, 5 incidents were detected 2 hours before the field recorded event time, 2 incidents were detected more than 1 hour before the field recorded time, 8 incidents were detected 3-42 minutes before, 4 incidents were detected about the same time as the field recorded time, and 3 incidents were detected less than 2 minutes later than the field recorded time. The average false alarm rate is about once per 48 hours operation time. The tool was also connected to the real-time drilling data in remote drilling operation support center. during the trail, two early stuck pipe signs are cap

关键词： drills

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development Analysis and Prospect of Continuous Circulation drilling technology 13th

Development Analysis and Prospect of Continuous Circulation ...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Hu, Zhi-Jian Li, Xing-Yue Shao, Qiang Cheng, Jin CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

Continuous circulation drilling technology has been widely applied abroad and has become an effective means to solve the safety of drilling in complex formations. However, due to insufficient understanding, there is still a significant gap in product development and application level between China and foreign countries. In order to improve understanding, the paper first systematically reviews the development history and current situation of continuous circulation drilling technology and products in domestic and foreign, and then through typical application cases, the main application fields and advantages of the current continuous cycle drilling technology are analyzed and summarized, as well as the applicability, compatibility, safety and reliability of different products. The application practice show that it can play an important role in the narrow density window wells, HTHP wells, Erd wells, horizontal wells and gas/foam drilling wells, and significantly improve the drilling safety and success rate. In view of the development requirements of domestic oil and gas resources, the development plan of applying continuous circulation drilling technology to potential fields such as ultra-deep carbonate reservoir and unconventional shale gas is proposed, and according to the characteristics of two different systems, the optimal schemes are selected and the corresponding development objectives are formulated, which will provide useful reference for promoting the further development of continuous circulation drilling technology. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Horizontal wells

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A hybrid machine learning optimization algorithm for multivariable pore pressure prediction

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Petroleum Science 2024年第1期21卷 535-550页

作者： Song deng Hao-Yu Pan Hai-Ge Wang Shou-Kun Xu Xiao-Peng Yan Chao-Wei Li Ming-Guo Peng Hao-Ping Peng Lin Shi Meng Cui Fei Zhao School of Petroleum and Natural Gas Engineering Changzhou UniversityChangzhou213164JiangsuChina Tubular Goods Research Institute of CNPC Beijing102249China CNPC Engineering Technology R&D Company Limited Beijing102206China

Pore pressure is essential data in drilling design,and its accurate prediction is necessary to ensure drilling safety and improve drilling *** methods for predicting pore pressure are limited when forming particular structures and *** this paper,a machine learning algorithm and effective stress theorem are used to establish the transformation model between rock physical parameters and pore *** study collects data from three *** 1 had 881 data sets for model training,and Wells 2 and 3 had 538 and 464 data sets for model *** this paper,support vector machine(SVM),random forest(rF),extreme gradient boosting(XGB),and multilayer perceptron(MLP)are selected as the machine learning algorithms for pore pressure *** addition,this paper uses the grey wolf optimization(GWO)algorithm,particle swarm optimization(PSO)algorithm,sparrow search algorithm(SSA),and bat algorithm(BA)to establish a hybrid machine learning optimization algorithm,and proposes an improved grey wolf optimization(IGWO)*** IGWO-MLP model obtained the minimum root mean square error(rMSE)by using the 5-fold cross-validation method for the training *** the pore pressure data in Well 2 and Well 3,the coefficients of determination(r^(2))of SVM,rF,XGB,and MLP are 0.9930 and 0.9446,0.9943 and 0.9472,0.9945 and 0.9488,0.9949 and *** achieves optimal performance on both training and test data,and the MLP model shows a high degree of *** indicates that the IGWO-MLP is an excellent predictor of pore pressure and can be used to predict pore pressure.

关键词： Pore pressure Grey wolf optimization Multilayer perceptron Effective stress Machine learning

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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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