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Opportunities,Challenges and Countermeasures for Construction of China's CCUS Industrial System

Opportunities,Challenges and Countermeasures for Constructio...

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2024国际石油石化技术会议

作者： Bing LI Bo ZHOU Pingliang FANG JingYU Liu HE Boyu SI CNPC Engineering Technology R&D Company Limited

Under the national 'dual carbon' goal,it is a Chinese strategic choice to develope carbon dioxide capture,utilization and storage(CCUS) vigorously in order to reduce carbon dioxide emissions and ensure future energy security,which is also an essential approach to foster ecological civilization and achieve sustainable ***,Chinese CCUS technology has been laid the solid foundation for widespread *** industrial developmen,with a mature CCUS technology and industrial system in *** China's carbon trading market and the establishment of industrial policies and financial ecosystem have been built,CCUS has entered a fast lane of rapid ***,compared to foreign counterparts in the CCUS industry,China's future industrial system and its development still face numerous challenges concerning technology advancement,industrial integration,as well as policy *** light of both domestic and international circumstances,this paper analyzes the status quo of CCUS demonstration projects,CCUS industrial systems,CCUS technologies and policies at home and abroad,and points out the problems and shortcomings of China's CCUS industry in key technology breakthroughs,formation of industrial clusters,market mechanisms and policy incentives through benchmark-based research,and proposes recommendations for future developments in the CCUS industry by focusing on establishing a productive system with innovative technology that benefits the entire industrial chain;achieving large-scale deployment through emerging industrial chains;promoting coordinated growth among enterprises along the entire value chain;as well as strengthening relevant laws and regulations.

关键词： Opportunities,Challenges and Countermeasures for Construction of China's CCUS Industrial System

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Two-Stage Active-Flux Observer for Position Sensorless Control of PMSM drives with Output Filter 26

Two-Stage Active-Flux Observer for Position Sensorless Contr...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Wang, Aiguo Chen, dongdong Tao, Lingyu Han, Fei Hu, Zhijian Wang, Hongwei Qiao, Han Wang, Jin Cnpc Engineering Technology R&d Company Limited Beijing China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

This paper presents a two-stage active-flux observer for sensorless control of permanent magnet synchronous machines (PMSMs) in a case where the inverter output is filtered by a LC filter. First, a full-order active-flux observer is presented taking the LC filter into consideration. Stator voltages, stator currents and the active flux can be observed without additional measurements except the inverter output currents. Then, the feedback matrix of the observer is designed according to the stabilization algorithm, guaranteeing sufficient stability margin and a good performance in a wide-speed range. Based on the full-order observer, a two-stage observer is proposed to reduce the computation burden. Furthermore, an adaptive law is derived for rotor speed estimation. Finally, the effectiveness of the proposed observer is verified by comprehensive simulation and experiments. © 2023 IEEE.

关键词： Sensorless control

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Key Safe drilling technology and Application of Highly deviated Well for High-Pressure Gas reservoirs in Western the right Bank of the Amu darya river 13th

Key Safe Drilling Technology and Application of Highly Devia...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Li, Gan-Lu Zhong, Zhao Liu, Ji-Tong Cheng, Wei-Heng Ye, dong-Qing Zhou, Hai-Qiu Zhang, Wei Xiao, Yue CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China AM River Natural Gas Company Beijing China

ISBN: (纸本)9789819702558

The west of Amu darya right Bank has complex geologic conditions and active shallow groundwater. The middlesalt-gypsum layers of Kemalian stage contain lenticular high-pressure saline aquifer, and the lower Kalov-Oxfordian reservoir develops high-pressure gas layer and high sulfur content. Complexities such as water invasion, gas kick, wellbore instability and leakage are prone to occur during drilling. The integrated application of suitable characteristic technologies such as wellbore structure optimization technology, strong inhibitive anti-sloughing drilling fluid technology and creep-resistant salt layer drilling fluid technology has effectively solved the problem of safe drilling of highly deviated wells in high-pressure gas reservoirs. This paper focuses on the optimization design of wellbore structure, drilling fluid technology for salt gypsum layer and safe drilling technology for salt gypsum layer. The subject ideas of several technologies in this paper are based on the properties of salt-gypsum layer and wellbore stability. This paper optimizes the seal-point, forms the three-section drilling program. The strong inhibition and anti-collapse drilling fluid system for upper layer and the polysulfonate under saturated-saturated brine drilling fluid system for salt-gypsum layer, and the salt-gypsum layer safe drilling technology are optimized. The integrated application of the above technologies reduces the occurrence of serious drilling fluid leakage, casing collapse and other complexities. The salt-gypsum layers are successfully drilled, and the cementing quality is guaranteed, the risks of safe drilling of highly deviated wells for high-pressure gas reservoirs in this area are effectively reduced, which provides reference for similar reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Aquifers

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Study on Parameters Optimisation of Fracturing Stages & Perforation Clusters in Luzhou deep Shale Gas Horizontal Wells Based on Integrated drilling and Logging data

Study on Parameters Optimisation of Fracturing Stages & Perf...

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2023 Asia Pacific Unconventional resources Symposium, APUr 2023

作者： Yuan, L. Hu, S.L. Mu, L.Y. Wang, d.L. Yang, X.T. Song, Y. Wang, J.C. CNPC Engineering Technology R&D Company Limited China CNPC Oilfield Service Company Limited China PetroChina Southwest Oil and Gas Field Branch China PetroChina Xinjiang Oilfield Branch China

ISBN: (纸本)9781959025146

Considering the high temperature environment and high operation cost, only a small number of deep shale gas horizontal wells in Luzhou would conduct logging in horizontal sections. If the neighboring wells were rather far away, it would be difficult to accurately obtain the reservoir heterogeneity along the lateral;therefore, most completions were designed geometrically, with little or no guidance for the location optimizations of fracturing intervals & perforation clusters. In such a case, it was most likely to occur a low opening rate of perforation clusters in the same stage, resulting in a poor stimulation effect. For the first time, this paper proposed a novel optimization method for the fracturing parameters of horizontal sections based on integrated drilling & logging data. Firstly, the available data type was evaluated. If the logging data was missing, geometrically designed stages and clusters would be relocated based on drilling data;otherwise, it could be easily accessible by logging data. Then, when relocating, the drilling data (torque, drilling pressure, mechanical drilling speed, etc.) were used to calculate the rock mechanical specific energy (rMSE) along the lateral. Next, the rMSE values were calibrated with the indoor rock mechanics experiments to establish a standard classification of Luzhou deep shale rock hardness. Finally, based on the principle of similar rock hardness, the perforation clusters in the same fracturing stage were re-positioned to ensure their locations at the same or adjacent rock hardness level. The above design method was applied and verified in Luzhou deep shale gas wells, the results demonstrated that, after the geometrically distributed segments & clusters were adjusted and relocated, their positions had a high matching rate of 85.47% with the optimized design of fracturing segments & perforation clusters using logging data. What’s more, the VideoLog technology was utilized to observe the erosion of the perforation holes a

关键词： rock mechanics

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Fracture Geometries and Breakdown Pressures of Multi-Branch radial Borehole Fracturing Influenced by Horizontal Stress difference 57

Fracture Geometries and Breakdown Pressures of Multi-Branch ...

引用

57th US rock Mechanics/Geomechanics Symposium

作者： Yong, Yuning Guo, Zhaoquan Tian, Shouceng Wang, Tianyu Sheng, Mao Liao, Lulu Beijing China Beijing Petroleum Machinery Company Limited CNPC Engineering Technology R&D Company Limited Beijing China Sinopec Research Institute of Petroleum Engineering Beijing China

ISBN: (纸本)9780979497582

Multi-branch radial boreholes can be drilled and combined with hydraulic fracturing to efficiently stimulate tight gas reservoirs. This paper experimentally investigates how horizontal stress difference affects fracture geometry and breakdown pressure in multi-branch radial borehole fracturing by a true triaxial fracturing device. Six artificial rocks (395 mm ×395 mm ×395 mm) were cast for the experiments, which are divided into two groups by the azimuth of the radial borehole. The results show that fracture geometries are controlled by the rectification of a single radial borehole, the extrusion between the adjacent radial borehole row, and the deflection of the maximum horizontal stress. Fracture propagation is affected by the dynamic variation of the three effects. decreasing the stress difference is favorable for fracture propagation along the radial borehole axis, while it lifts the breakdown pressure. decreasing the azimuth lifts fracture extension distance parallel to the radial borehole axis and reduces the breakdown pressure. This research sheds light on the feasibility of radial borehole fracturing for reservoirs under various stress differences. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Boreholes

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Advanced 4d drilling dynamics Model Simulates downhole Vibration and Helps to Optimize in Preventing drill String Failure

Advanced 4D Drilling Dynamics Model Simulates Downhole Vibra...

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

作者： Zhang, Jiawei Wang, Qing du, Shiliang Zhuo, Lubin Liu, Wei Ling, Bo CNPC Engineering Technology R&D Company Limited Beijing China China National Oil and Gas Exploration and Development Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Qinghai Oilfield Company Gansu Dunhuang China

ISBN: (纸本)9781959025269

downhole vibration, such as backward or chaotic whirling, is one of the primary causes for drill string failure during drilling operation. Understanding drilling dynamics is crucial for determining the mechanism of vibration and fatigue accumulation so as to mitigate risk of drill string failure. drilling dynamics or vibration data can either be obtained from real-time measurement or simulation based on dynamics model, which plays a crucial role for drilling optimization in pre-drill planning phase. An advanced 4d drilling dynamics model, which considers the interaction between drill bit and formation, impact and friction between drill string and wellbore, constraints exerted on drill string and drill bit, is proposed to simulate the distribution and variation of 3d displacement, velocity, acceleration as well as the stress state of entire drill string within specified time period. This time domain model allows exploration of the full range of dynamics response under different drilling scenarios, which helps to optimize the performance and reliability of BHA as well as WOB/rPM selection. Moreover, drill string fatigue life prediction can also be achieved by combing simulated stress state and fatigue accumulation theory. Simulation shows that BHA with smaller- sized drill collar or fewer stabilizers are more susceptible to backward and even chaotic whirling while drilling. Also, inappropriate WOB/rPM combinations such as low WOB with high rPM could also cause the onset of severe lateral vibration. High frequency bending stress, mainly concentrated on BHA and caused by lateral vibration, is the main reason for rapid fatigue accumulation and continuous severe vibration could even result in drill string fatigue failure within hours. These findings helped to justify the 5 consecutive BHA failure and 1 washout while drilling the 171/2" wellbore with 7621 ft length of an ultra-deep well. Simulation also showed that downhole lateral vibration severity was significantly redu

关键词： drill collars

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Factory drilling and Fracturing technology for Tight Sandy Conglomerate Oil reservoir in the Junggar Basin

Factory Drilling and Fracturing Technology for Tight Sandy C...

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Abu dhabi International Petroleum Exhibition and Conference 2022, AdIPEC 2022

作者： Chang, Long Zou, Lingzhan Wang, Haige Yu, Yangfei Liu, Qi Zhuo, Lubin Yu, Jing Wu, Baocheng Xu, Jiangwen Shi, Jiangang CNPC Engineering Technology R&D Company Limited PetroChina Xinjiang Oilfield Company China

ISBN: (纸本)9781613998724

The Triassic Baikouquan Formation reservoir in the Mahu Sag, Junggar Basin is characterized by tight sandy conglomerate oil reservoir with long drilling cycle and great fracturing difficulty. The factory drilling and fracturing techniques of horizontal wells for the Ma131 Well Block of Mahu Oilfield have been determined by regional geological characteristics research and optimization scheme design. The key technologies for horizontal well drilling speed improvement were explored by designing small three-stage wellbore structure, customizing the PdC bit properly, optimizing drilling tool combination, and selecting the drilling fluid with inhibition and plugging ability. The factory reservoir stimulation technique carried out horizontal well hydraulic fracturing with small well spacing for two sets of beds, and adopted bridge plug + clustering perforation staged fracturing and slick water + gel composite fracturing technology. 12 wells in a drilling pad were arranged in the demonstration area with the depth of 5000m, the distance between adjacent sections was 150m or 100m, with the horizontal section length of 1800m. Batching drilling operation pattern was adopted, with 3⁃well drilling for each of rig. rapid inclining prevention drilling through vertical sections adopted PdC bit + screw + MWd, with high rotary speed and high flow rate. In the build-up section, radical drilling parameters was used to improve the top drive rotary speed and release the torque. In the horizontal sections, rotary steering tool + low speed high torque screw was adopted. The application of this technology achieved good results, with average drilling cycle of 48.3 d and average rOP of horizontal section increased by 77%. The fracturing construction adopted high pad fluid ratio, high sand ratio and high pump rate. More than 10,000 m3 fluid was injected in a single well with high-intensity proppant injection. The factory operation was carried out in the order of construction from the two sides

关键词： Horizontal wells

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Water Shutoff and Conformance Improvement for Lamadian Oilfield in daqing Using a Novel Polymer System: Experimental Study, Simulation, and Pilot Tests

Water Shutoff and Conformance Improvement for Lamadian Oilfi...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Lu, Meng Singh, Harpreet Li, Jianshen Huang, Qiushi Ma, Chi Shan, Gaojun du, Qinglong Cai, Meng Wang, Haitao Liu, Xiangbin Qiao, Yan Chen, Huan Chen, Zhao Nie, Cong CNPC USA Corp HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Daqing Oilfield Company Heilongjiang Daqing China

ISBN: (纸本)9781959025078

Primary recovery and extensive waterflooding lead to preferential pathway for the water between injectors and producers, resulting in low sweep efficiency and lower oil recovery. The Lamadian Oilfield in daqing has been waterflooded for 50 years, where various methods have been tried to reduce the high water-cut. This paper presents a novel water conformance control system that has been successfully applied to reduce water-cut and increase the oil production from Lamadian Oilfield. The polymer system containing swelling particles and delayed polymer gelling agents to form plugs and block high permeability channels was tested in the laboratory through sandpack and coreflood experiments at reservoir temperature using injection brine from the Lamadian Oilfield. With injection concentration of polymer ranging between 1200-4500 ppm and crosslinker between 1200-1600 ppm, the experimental tests showed formation of strong plugs in-situ with delayed time of 4-18 days. This system also had low polymer/crosslinker's retention. The lab-measured parameters for rock-fluid interaction were used as input in a history-matched numerical reservoir simulator. Several scenarios with different injection schemes were simulated to investigate the volume of plugs formed, maximum distance travelled by the gelling agents from the injectors before forming plug, and their impact on the surrounding production wells. Simulation results showed that the formation of the plug was the most robust at the front of the crosslinker-polymer system, and the region between the injectors and the front showed formation of secondary plugs by the particles. An optimal scenario was selected for pilot tests. Field tests for 2 well groups with a total of 16 wells started in december 2021 that were successfully completed by April 2022. Field test results show the targeted high-perm channels were blocked, resulting in a significant increase in oil production (up to 15%) in the majority (71%) of the surrounding produ

关键词： Control systems

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limited Entry Liner Completion and Acidizing design with Consideration of reservoir Heterogeneity for MrC Wells

Limited Entry Liner Completion and Acidizing Design with Con...

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2023 Asia Pacific Unconventional resources Symposium, APUr 2023

作者： Liu, Huifeng Jia, Wanting Cui, Longlian Xu, Ning Yang, Guobin Liqiu, Ping Chen, Zhangxin CNPC R&D DIFC Company Limited Dubai United Arab Emirates CNPC Engineering Technology R&D Company Limited Beijing China PetroChina International Investment Australia Pty Ltd Brisbane Australia Department of Chemical and Petroleum Engineering University of Calgary CalgaryAB Canada

ISBN: (纸本)9781959025146

MrC (Maximum reservoir Contact) wells with extra-long laterals (formation contact length > 5000m) are drilled in many oilfields in the world to develop tight and thin reservoirs. LEL (limited Entry Liner) completion and acidizing are an effective technology to stimulate these wells because they distribute the acid uniformly along the long laterals. The design of a distribution of holes in LEL is the key to this technology, especially for reservoirs with high heterogeneity. This study focuses on the optimization of the current LEL completion design strategy by considering the porosity heterogeneity along the lateral and the permeability anisotropy within each segment. Firstly, a model for designing a distribution of holes in LEL is established by incorporating a newly developed model for calculating a post-stimulation equivalent skin factor. Secondly, three LEL completion design strategies are proposed: uniform acid coverage, uniform wormhole length and uniform equivalent skin factor. Thirdly, a real well case is introduced to show the difference between the three strategies in terms of the distribution of holes, generated wormhole length and post-stimulation skin factor. In our new design model, the variances of formation porosity, the differences in acid outlet flow velocity among different segments and the difference in permeability in different directions are considered. This model is used in a horizontal well to achieve uniform post-stimulation equivalent skin factor and the result is compared with those by the other two design strategies. The result from the uniform acid coverage strategy shows that the total number of holes is 198, the length of the generated wormhole is 4.46ft and the equivalent skin factor is -2.88. The result from the uniform wormhole length strategy indicates that fewer holes (totally 135) and a more irregular holes distribution are obtained;the wormhole length is 0.43ft. The result from the uniform equivalent skin factor design strategy s

关键词： Porosity

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3d geomechanical model construction and application of deep shale gas in the Luzhou Block, Sichuan Basin 57

3D geomechanical model construction and application of deep ...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wang, Yuan Yang, Henglin Fu, Li Chen, Gang Yuan, Guangjie Zhang, Heng Wang, Zixin CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9780979497582

deep shale gas with a burial depth of 3500-5000m became an important area for shale gas development in China. The characteristics of the rock's mechanics and the in situ stress have a significant impact on the drilling and fracturing effects of horizontal wells. Finite element simulation is used to build an accurate in situ stress model from the data of acoustic logging, diagnostic fracturing injection test, FMI imaging logging, and stress measurement. The results show that Young's modulus and Poisson's ratio in the Luzhou block change vertically with the deposition time. The Longmaxi reservoir has an abnormally high pore pressure gradient which ranges from 16.7 kPa/m to 21.7 kPa/m. The stress regime of the Luzhou block is primarily strike-slip type, with an overburden pressure gradient of 25.5kPa/m, and a minimum horizontal stress gradient range of 18.8 to 24.5kPa/m. According to wellbore breakouts and acoustic emission experiments of cores, the ratio between σhmax and σhmin is 1.165. The horizontal principal stress of the reservoir increases with the increase of Young's modulus and pore pressure. The conclusion is that high-precision geomechanical models can effectively serve to improve the efficiency of drilling operations, improve the production of single wells and benefit development. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Pore pressure

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