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research on the Step drilling System for Water Jet radial drilling 13th

Research on the Step Drilling System for Water Jet Radial Dr...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Chen, Zhi ren, Bin Lv, Wei-Ping Zhang, Yan Zhou, Shi-Jie Zhu, Ye CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

The low traction force of the front-end nozzle for water jet radial drilling limits the drilling distance. The ground run drilling method has complex force transmission, large run-in-hole fluctuation, and has difficulty in the ground precise control of downhole drilling speed. In view of this, a step drilling system for water jet radial drilling is studied. The system realizes the low-speed drilling of the nozzle through the low-speed drilling controller, and ensures the continuous drilling of the nozzle through the step anchor feeding mechanism. The step anchor feeding mechanism has a feeding distance of 2 m each time, and the drilling distance of the nozzle is equal to the feeding distance multiplied by the feeding times. Increasing the feeding times can achieve long-distance drilling. After the drilling is completed, reduce the system pressure, and the step anchor mechanism releases the anchor. Then use a coiled tubing to lift the tool out of the wellbore. When jet drilling, the pushing speed (v1) of the nozzle is consistent with the rock breaking speed (v2) of the jet, and the rock breaking effect is good. If v1 > v2, it will cause the nozzle to collide with the end of the hole, causing the jet hose to bend and block in the hole, ultimately preventing long-distance drilling;If v1 © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： rocks

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Application of direct Torque Control (dTC) in the drilling System of Electric drilling Tool 13th

Application of Direct Torque Control (DTC) in the Drilling S...

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13th International Field Exploration and development Conference, IFEdC 2023

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

ISBN: (纸本)9789819702558

drilling system with electric drilling tool is one of key drilling technologies for the development of electric-driven drilling in the days to come, but the characteristics of rock cutting by downhole electric motor driving bit is significantly different from that of rock cutting by conventional rotary table and TdS driving drilling string to rotate the bit. downhole electric motor is highly effective with flexible control, which is incomparable for rotary table and TdS. However, due to the limit of downhole space size, downhole electric motor fails to reach the reserve of torque for rotary table and TdS;At the same time, the characteristics of rock cutting by bit is alternating load with high frequency and is greatly affected by the factors of the outside, such as WOB, rPM, and characteristics of rock cutting in the formation, which will make the situation worse for downhole electric motor with inadequate reserve of power;Thus it leads to the failure of realizing the running of bit at stable speed. So, to adapt to the characteristics of high frequency alternating load for the bit, control system of downhole electric motor is required to be provided with better performance of dynamic response. Based on the change of load characteristics, output torque of electric motor is timely adjusted to achieve the steady control of motor revolution speed. On the one hand, efficiency of rock cutting is improved, on the other hand, use life of bit is extended. This paper, through the comparison test of pilot performance for currently existing and more mature frequency converter of vector control mode without position, primarily verifies the mode of direct torque control (dTC) and control of permanent magnet synchronous motor by long-distance vector without position (1800 m) is achieved. Compared with conventional V/F ratio open-loop control mode, the higher performance of dynamic response is attained. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Torque

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design and Test of Cable Sealing Component of Conductive Slip ring for Electric drilling System 13th

Design and Test of Cable Sealing Component of Conductive Sli...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Hu, Zhi-Jian Qiao, Han Wang, Ai-Guo Wang, Hong-Wei CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

The conductive slip ring is a key device for achieving underground power supply and bidirectional information transmission of Electric drilling System, and the sealing of non-circular cross-section cables is an important element to ensure the reliable operation of the conductive slip ring, but the conventional sealing method is difficult to meet the requirements. According to the installation space of the conductive slip ring and the cable structure, two kinds of cable seal test component were designed and manufactured by means of customized sealing sleeve and filling sealant. Through hydrostatic test, their sealing performance and reliability were studied and analyzed, and the sealing method suitable for non-circular cross-section cables was optimized and improved. The test results show that the use of customized sealing sleeve is easy to cause problems such as sealing surface movement and uneven compression, which can not meet the sealing requirements of non-circular cross-section cables. In comparison, the method of filling sealant has strong adaptability to the sealing of non-circular cross-section cables and can be combined with mechanical clamping methods to further improve the reliability of cable sealing. On this basis, a cable sealing component that combines filling sealant and mechanical clamping has been developed which solves the problem of non-circular cross-section cable sealing of the conductive slip ring, and it was successfully verified by the actual drilling test, and will provide important support and guarantee for the safe and reliable application of Electric drilling System. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Filling

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Optimization of Perforation Phasing for Improving Uniformity of Perforation Erosion Through Computational Fluid dynamic Modelling and downhole Video Imaging

Optimization of Perforation Phasing for Improving Uniformity...

引用

2024 Offshore technology Conference Asia, OTCA 2024

作者： Yuan, L. Hu, S.L. Mu, L.Y. Wang, d.L. Yang, X.T. CNPC Engineering Technology R&D Company Limited CPET China

ISBN: (纸本)9781959025030

The limited-entry technology was a key technology in the multistage fracturing of shale oil and gas horizontal wells to help distribute fracture fluid among multiple perforation clusters evenly. However, perforations could be eroded and enlarged because of high-speed and continuous abrasion by the proppants, resulting in unequal inflow and uneven cracks propagation between perforation clusters, which caused low efficiency of the fracture treatment. Considering that the perforation erosion has not been fully understood yet, special attention should be paid to this aspect of research. In this paper, perforation erosion models were built using computational fluid dynamics (CFd) to simulate the distribution of the flow field when high-speed fracturing fluid with proppants injected perforations. Then, the flow field analysis was conducted to investigate the impact of the perforation phase on erosion and chambering. Finally, pre-fracturing and post-fracturing erosion data were obtained by the downhole video imaging technology, which was employed to validate against simulation results. Based on above technics, the erosional pattern of perforation would be clearly revealed. The CFd simulation results demonstrated that, perforations were rapidly eroded to droplets (a typical streamline shape) from the initial round shape because of the much higher erosion rate on the upside of the perforation (near toe) than the downside (near heel). The CFd modelling also noted that there was huge difference of erosion rate between perforations at different phases. Perforations at phase 0 degree (high side of the horizontal wellbore) suffered the minimum erosion rate while perforations at phase 180 degree (down side of the horizontal wellbore) got the maximum. As for perforations at phase 90 and 270 degree, their erosion rates were intermediate，and the values were similar. What's more, the above simulation results were verified by the downhole video imaging data. Most post-fracturing perfor

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Future development Path of China's Fossil Energy under the Background of Carbon Peak and Carbon Neutrality

Future Development Path of China's Fossil Energy under the B...

引用

2024 International Petroleum technology Conference, IPTC 2024

作者： Yu, Jing Zhou, Bo Li, Bing Fang, Pingliang Zhang, Hongyuan Huang, Hongchun Chen, Changchang CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025184

This research focuses on two main lines: national energy supply and demand security under the goals of carbon peak and carbon neutrality, as well as national energy green and low-carbon development. The research conducts quantitative prediction on the total demand and energy structure of national fossil energy under low-carbon transformation goals, providing reference for the country to implement green and low-carbon energy transformation and build a new energy system. Based on the national energy security and carbon peak and carbon neutrality strategic objectives, this study uses grey relational analysis to conduct multi-factor analysis and innovatively builds a fossil energy development potential prediction model under the "dual carbon" goal constraints. Three scenarios of robust-sustainable transformation, active-CCUS technology breakthrough, and radical-renewable energy technology breakthrough are designed to analyze the energy development paths under different scenarios, outlining the national energy development path and defining the quantitative targets for the fossil energy development phase. Through multiple model calculations, it is found that in the three scenarios, China's primary energy consumption will peak around 2030, with a peak value of approximately 5.99-6.01 billion tons of standard coal. The total energy consumption demand will slowly decline from 2030 to 2040, and maintain basic stability from 2040 to 2060. In the three scenarios of robust, positive and radical, China's energy consumption in 2030 is respectively 6.01, 5.99 and 6.01 billion tons of standard coal, of which non-fossil energy accounts for 24.9%, 27.0% and 28.3% respectively. By 2060, China's energy consumption will be approximately 5.63, 5.8, and 5.87 billion tons of standard coal, with non-fossil energy accounting for 73.6%, 80.0%, and 85.2% respectively. In response to the challenges facing the adjustment of the national energy supply and demand structure, this research has propos

关键词： energy development future predictions oil and gas Peak carbon emissions and carbon neutrality policy recommendations

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discussion on Mechanical and drilling Performance of the Positive displacement Motors of Wall Thickness rubber 13th

Discussion on Mechanical and Drilling Performance of the Pos...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Li, Ya-Fei Lin, Zi-Li Li, Mu Zou, Yi Huang, Peng-Peng Hao, Wei-Wei Wang, Hao CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

The wall-thickness rubber stator positive displacement motors (PdM) has a long service life, high mechanical efficiency, and adaptability to bottom-hole temperature. With the increase of using time, the output torque of the drilling tool is stable, which can improve the crop of drilling and reduce fuel consumption. The uniform thickness of the rubber layer in the stator spiral cavity of equal wall thickness screw drilling tools, compared with that of the conventional positive displacement motors with the equal wall, the motor rotor swing offset is constant, the wear of the universal shaft is reduced, and the service reliability and life of the cardan shaft are improved. A mathematical model was used to simulate some of the mechanical properties of the positive displacement motors of wall-thickness rubber. The result shows that the wall-thickness rubber stator PdM has a high single-stage pressure, its length is about half shorter than the conventional PdM, and its output torque is basically the same, which can achieve the near bit effect of MWd or LWd, which is conducive to the application in medium and short radius deflecting, and the deflecting effect is obvious. The results of finite element analysis show that the wall-thickness rubber stator has better-sealing properties, more uniform stress distribution, and fewer stress changes than the conventional stator. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Finite element method

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Laboratory Investigation of Cryogenic Fracturing Effect of Hot dry rock Wellbores Under Triaxial-Confining Stresses 13th

Laboratory Investigation of Cryogenic Fracturing Effect of H...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Huang, Peng-Peng Li, Mu Hao, Wei-Wei Wang, Hao Li, Ya-Fei Zou, Yi CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702671

Hot dry rock (Hdr) contains abundant thermal energy, which can be extracted through fracturing and used for electricity generation. due to its deep depth, high-temperature and high-pressure conditions, it is difficult to initiate fractures for conventional hydraulic fracturing technology. This paper study the advantage of cryogenic fracturing on the Hdr. We conducted a series of laboratory experiments on rock samples with different length of open-hole under triaxial-confining stresses (10 MPa). The nitrogen fracturing wellbores of high temperature (100–300 ℃) granites were treated with LN (liquid nitrogen) and NO-LN and retained with 20 mm and 30 mm open-hole to form four control groups. The fracturing results show that LN cryogenic stimulation is more effective in reducing the Hdr initiation pressure. When the open-hole is 20 mm, the breakdown pressure of samples with LN decreases by 13.9%–18.7% compared with untreated samples. When the open-hole changed from 20 mm to 30 mm, the breakdown pressure of samples with NO-LN are reduced by 6.7%–15%. The samples with a 30 mm open-hole inside the wellbore formed complex fracture patterns after the nitrogen fracturing. This could be attributed to the longer open-hole, the more complex micro-fractures on the surface and the force of the direction parallel to the cross section is significantly increased. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Liquid nitrogen

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research on the Effect of Combined Cutters of PdC Bit on Cutting Efficiency 13th

Research on the Effect of Combined Cutters of PDC Bit on Cut...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Shao, Fang-Yuan Ji, Guo-dong Wu, Qiang Zhang, Jia-Wei CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

Polycrystalline diamond compact (PdC) bits have changed the way to cut rock comparing to the roller cone bits, occupying a large market in oil and gas drilling. PdC cutter is made of diamond layer and tungsten carbide. With the continuous improvement of PdC cutter processing technology, the non-plane (special-shaped) structures of PdC layer have been realized. Many special-shaped cutters adapted to different formations were invented. In order to broaden the application range of these special-shaped cutters, a series of combination of multiple PdC cutters should be studied. As an extension of single cutter testing, multiple PdC cutters testing is closer to the PdC bit drilling in the field. In this paper, to explore the effect of multiple PdC cutters, the numerical simulation software LS-dYNA was used to simulate the rock breaking modes of different combinations of special-shaped cutters and traditional plane cutters. The numerical simulation results show that the combination of special-shaped cutter and traditional plane cutters has obtained higher cutting efficiency. The profile of special-shaped cutter’s cutting track is more conducive to the improvement of the efficiency of the adjacent cutters. With the increase depth of cutting (dOC), the cutting efficiency increases gradually. At the same time, the optimal cutter spacing increases with the increase of dOC. The research results show that the cutting efficiency can be improved by the combination cutting mode of special-shaped cutter and cylinder-shaped cutter (CSC), which provides an important theoretical support for personalized bit design in difficult formations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tungsten carbide

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Hydrodynamic Oscillator Mechanism research and Field Application 13th

Hydrodynamic Oscillator Mechanism Research and Field Applica...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhang, Hong-Lin Mi, Kai-Fu Guo, Tian-Ming Yu, Xing-Sheng Gao, Ye Zhang, Sheng-Liang CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789819702558

To solve the problem of high friction and high pressure during drilling, and to improve the drilling speed of sliding drilling machinery, this paper researches the mechanism of hydraulic oscillator by using numerical calculation method to study the mutual relationship between pressure pulsation value and valve hole curvature, overflow area and flow rate, and reveals the basic law of pressure pulsation formation;through the study and evaluation of the force analysis of the mathematical model of hydraulic oscillator, it elaborates the oscillation mechanism;In order to verify the accuracy of the theoretical analysis, a 178-type hydraulic oscillator was designed and manufactured, and the field test was conducted in a triple-opening well, and it was found that after using the hydraulic oscillator, the sliding drilling stroke drilling speed and the sliding slope creation rate were significantly increased, and it was found that the average stroke drilling speed and the average mechanical drilling speed of the well drilled with the hydraulic oscillator were obviously different, which proves the correctness of the mechanism of the hydraulic oscillator study. The conclusions obtained can provide a design basis and theoretical foundation for the hydraulic oscillator. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Infill drilling

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LSTM recurrent Neural Network Based Method for Identification of drilling Operating Conditions and Its Application 58

LSTM Recurrent Neural Network Based Method for Identificatio...

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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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