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4th International Conference on New Material and Chemical Industry, NMCI 2019

作者： Li, Long Cheng, rongchao Ma, Cha Zhang, Jie Jiangxi Science and Technology Normal University Nanchang330013 China CNPC Engineering Technology R&D Company Limited Beijing100083 China

ISBN: (纸本)9783035716511

due to borehole instability problem in low permeability formations, a new type of spherical polymer sealing agent (OLBS) for oil-based drilling fluids was prepared via suspension polymerization, and the sealing effect of polymer sealing agent on low permeability cores was evaluated. The results indicated that OLBS had no influence on the rheological properties of oil-based drilling fluids. The core displacement experiments indicated that OLBS could reduce the core permeability by a significant amount, and thus stop fluid invasion into the formations, so OLBS could provide an excellent sealing effect and improve wellbore strength. Using this polymer sealing agent to plug the low permeability formations is a very powerful approach to address borehole instability problem in troublesome low permeability formations. This sealing agent is suitable for the drilling of long sections of horizontal laterals. In the future, the oil-based drilling fluids containing OLBS might hold great promise to resolve borehole instability problem in low permeability formations. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Low permeability reservoirs

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design and test of a torque-on-kelly measuring instrument

Design and test of a torque-on-kelly measuring instrument

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Electrical engineering and Automation (IFEEA), International Forum on

作者： rutao Ma Guohai Yuan Fei Ai Guoping Li Tingfu Ye Jingbing Luo Junlin Liu Xue Xia Shengpeng Yan LLC CNPC Engineering Technology R&D Institute Beijing China Shen Zhen Branch CNOOC China Ltd. Shenzhen China Petrochina Qinghai Oilfield Company LLC Dunhuang China

The torque on kelly measuring instrument is mainly used for real-time measurement of the dynamic torque on the lower joint of the kelly during drilling and workover processes. Safety of the operation could be evaluated based on measuring results. By analyzing the mechanical properties of metal materials under dynamic working conditions, engineering materials are selected. The main structure of the torque measuring instrument is designed in a small mandrel type. The torque measuring bridge and electric circuit are configured to realize real-time torque testing. Experimental platform was built to verify and analyze multiple sets of data, verifying the feasibility, effectiveness, and accuracy of the design. The research results provide a real-time torque testing method and technical support for drilling and workover operations.

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Completion and stimulation trends in North American unconventional plays and resulting impact on well productivity

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钻探工程 2021年第10期48卷 1-12页

作者： roman Galchenko Qing Liu Yan Gao Yu Liu david He Josh Zhang Huailiang Liu Xiaohua Ke CNPC USA Houston TX 77042USA CNPC Engineering Technology R&D Company Limited Beijing 102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing 102249China

过去十年,非常规油气勘探开发在全球范围内大幅扩张。水平钻井和多级水力压裂技术也在不断地发展和创新,使得超长水平井成为可能。同时,因为压裂强度不断增加,作业者可以最大限度地提高储层接触面积和对储层的改造体积(SrV)。然而,完井... 详细信息

过去十年,非常规油气勘探开发在全球范围内大幅扩张。水平钻井和多级水力压裂技术也在不断地发展和创新,使得超长水平井成为可能。同时,因为压裂强度不断增加,作业者可以最大限度地提高储层接触面积和对储层的改造体积(SrV)。然而,完井优化方面的挑战仍然存在,作业者持续不断地尝试和试验各种完井与增产参数组合,以确保非常规油气藏开发的经济可行性。优选最佳的完井与增产参数组合是一项非常关键的任务,应结合油气田的具体储层特征进行优化。本文总结了2014—2020年间北美9个主要非常规油气藏的压裂增产趋势,包括Marcellus,Haynesville,Barnett,Utica,Bone Spring,Bakken,Wolfcamp Midland,Eagle Ford,Scoop/Stack。分析了各油气田几个关键的完井和增产参数的整体趋势,同时还评估了单个参数(如水平段压裂长度、支撑剂强度、段间距等)对井产能的影响。然后对比分析相应的初始井产量(90天平均初始产量),评估各个参数对产能的影响,从而确定每个完井参数的最佳范围,以实现产能最优化。

关键词：水力压裂多级完井增产趋势井产能水平段长度支撑剂强度用液强度段间距井间距非常规油气北美

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Assessing Two-Well-Horizontal Caverns for Compressed Air Energy Storage in Low-Grade Salt rocks

SSRN

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SSrN 2024年

作者： Li, Qihang Liu, Wei Jiang, Liangliang Qin, Jianxu Wan, Jifang Zhu, Xuanshi State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China Department of Chemical and Petroleum Engineering the University of Calgary CalgaryAB Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China

To advance the development and deployment of compressed air energy storage (CAES) in underground salt caverns (USCs) for a carbon-resilient society, a comprehensive stability assessment is essential to ensure the safe operation of underground salt cavern gas storage (SCGS). In China, around 85% of low-grade salt rock features two-well-horizontal (TWH) caverns, which are notable for their high sediment content (SC) and restricted usable space. This study addresses the challenges associated with sedimentary voids energy storage and the stability of TWH-caverns for large-scale energy storage (LSES). We present a theoretical model for the volumetric inversion of TWH-caverns, based on salt extraction, salt layer characteristics, and interlayer ratio, using data from a low-grade salt mine in Feicheng City, China. We simulated the volume loss rate (VLr), displacement, and plastic zone volume (PZV) for various levels of high SC (50%, 60%, 70%, 80%, 90%) and internal air pressure (IAP) (8.1 MPa, 9.45 MPa, 21.6 MPa) in the roof, waist, and connected areas of both high and low caverns within the TWH-cavern. The results reveal that the creep characteristics of the high cavern are more pronounced, and the combined effects of SC and IAP effectively limit roof deformation. However, the displacement of the high cavern waist increases by 0.028 m (IAP = 8.1 MPa) and 0.006 m (IAP = 21.6 MPa) as SC rises from 80% to 90%. In the connected area, displacement values increase from 0.634 m to 0.852 m (IAP = 8.1 MPa) as SC increases from 50% to 90%. These findings highlight that the sediment surface is a critical factor in assessing the impact of SC on cavern deformation. The cavern roof remains the most critical component for ensuring the safe operation of SC- CAES. We propose effective measures to enhance roof stability and suggest establishing an intelligent big data platform to ensure the secure operation of low-grade SC-CAES. Accordingly, this study provides a theoretical basis for eval

关键词： digital storage

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Implementing a new managed pressure drilling equipment to drill offshore wells

Implementing a new managed pressure drilling equipment to dr...

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Offshore technology Conference 2020, OTC 2020

作者： Cai, Xiao Guo, Qingfeng Fu, Chunkai Jiang, Hongwei Liang, Lei Cnpc Engineering Technology R and D Company Limited China University OfLouisiana at Lafayette United States

ISBN: (纸本)9781613997079

due to the special working environment, offshore drilling operation faces multiple challenges such asnarrow pressure margin, difficulty in detecting down hole conditions and high operational risk. A newmanaged pressure drilling equipment is developed and named as pressure control drilling system-I (PCdS-I), which integrates the techniques of constant bottomhole pressure and microflux control and it is capableof performing the underbalanced, near-balanced and overbalanced MPd drilling as required. This new-typemanaged pressure drilling equipment is applied in several offshore wells to perform near-balanced managedpressure drilling operations with great success. Before utilizations, real-time hydraulic calculations are conducted based on the field data and backpressures are designed for reducing the density of drilling fluid. In the field applications, the PCdS-Iprecisely keeps the bottomhole pressure constant and minimizes the pressure fluctuations, creating a near-balanced drilling condition. In addition to the real-time bottomhole pressure measured by pressure whiledrilling (PWd) equipment, the pumping rate and returning rate of drilling fluid are monitored by the PCdS-I. The cumulative pumping and returning volumes of drilling fluid and their difference are calculated bya program and compared with the volumes of drilling tools, providing a new way to detect the overflowand lost circulation in the tripping operations. data of other operators are monitored and analyzed, such aslogging data, providing reference for detecting the downhole condition and determining the back pressure. Multiple drilling processes are successfully completed without any issue occurs with the assistance ofthis new managed pressure drilling equipment, including drilling, ma king connections, tripping, snubbingand circulating, etc. Cooperated with the PCdS-I, the density of drilling fluid dramatically reduces, whichminimizes the possibility of formation damage and benefits the identification

关键词： drilling fluids

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Comprehensive Safety Assessment Of Two-Well-Horizontal Caverns with Sediment Space For Compressed Air Energy Storage In Low-Grade Salt rocks

SSRN

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SSrN 2024年

作者： Li, Qihang Liu, Wei Jiang, Liangliang Qin, Jianxu Wan, Jifang Zhu, Xuanshi State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China Department of Chemical and Petroleum Engineering The University of Calgary CalgaryAB Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China

To expedite the construction and implementation of compressed air energy storage (CAES) in under- ground salt caverns (USCs), conducting a thorough stability assessment is crucial to ensure the safe operation of underground salt cavern gas storage (SCGS). In China, around 85% of low-grade salt rock features two-well-horizontal (TWH) caverns, which are notable for their high sediment content (SC) and restricted usable space. Herein this study addresses the challenges associated with sediment voids energy storage and the stability of TWH-caverns for large-scale energy storage (LSES). We present a theoretical model for the volumetric inversion of TWH-caverns, based on salt extraction, salt layer characteristics, and interlayer ratio, using data from a low-grade salt mine in Feicheng City, China. We simulated the volume loss rate (VLr), displacement, and plastic zone volume (PZV) for various levels of high SC (50%, 60%, 70%, 80%, 90%) and internal air pressure (IAP) (8.1 MPa, 9.45 MPa, 21.6 MPa) in the roof, waist, and connected areas of both high and low caverns within the TWH-cavern. The results reveal that the creep characteristics of the high cavern are more pronounced, and the combined effects of SC and IAP effectively limit roof deformation. However, the displacement of the high cavern waist increases by 0.028 m (IAP = 8.1 MPa) and 0.006 m (IAP = 21.6 MPa) as SC rises from 80% to 90%. In the connected area, displacement values increase from 0.634 m to 0.852 m (IAP = 8.1 MPa) as SC increases from 50% to 90%. These findings highlight that the sediment surface is a critical factor in assessing the impact of SC on cavern deformation. The cavern roof remains the most critical component for ensuring the safe operation of SC-CAES. We propose effective measures to enhance roof stability and suggest establishing an intelligent big data platform to ensure the secure operation of low-grade SC-CAES. Accordingly, this study provides a theoretical basis for evaluating the safet

关键词： digital storage

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Effect of Sds on the Formation and Blockage Characteristics of Ch4 Hydrate in a Flow Loop

SSRN

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SSrN 2022年

作者： Zang, Chunyang Ma, Guiyang Huang, Shaochang Qin, Yue Ao, di Liu, Chaoguang Zhang, Yuda College of Petroleum Engineering Liaoning Petrochemical University Liaoning Fushun113001 China Research Institute of Petroleum Exploration & Development Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

Anti-agglomeration is an ideal solution for the reduction of gas hydrate risks in deep-sea pipelines. Currently, the ineffectiveness of water-based systems limits their application. To ensure safe flow within a pipeline, a high-pressure flow loop with observation windows was designed, and SdS was used as an anti-agglomerant (AA). A series of CH 4 hydrate formation and slurry flow experiments was carried out under horizontal and inclined flow loops. The growth and blockage rules of hydrates in SdS solution and the effects of different factors on the hydrate induction period and blockage time were obtained. The experimental results show that SdS has a good anti-agglomeration effect in the water-based system. After the addition of SdS, the hydrate can only minimally deposit on the wall, allowing the hydrate slurry to flow stably for a long time and a higher volume fraction. Increasing the flow rate can prolong the hydrate slurry flow time. With the increase in the inclination angle of the loop, hydrate particles with larger particle sizes are more likely to appear, and the time until blockage is decreased. The flow rate in the loop decreases with increasing hydrate particle size. Understanding the flow process and blockage trend of hydrate slurry in a pipeline transportation system can, to an extent, provide a reference for the industrial application of CH 4 hydrate slurry flow. © 2022, The Authors. All rights reserved.

关键词： Agglomeration

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Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

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Petroleum Science 2020年第6期17卷 1717-1725页

作者： Yi-Ning Wu Yuan Li Meng-Jiao Cao Cai-Li dai Long He Yu-Ping Yang Shandong Key Laboratory of Oilfi eld Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580China Petroleum Engineering Institute Northwest Branch of SinopecUrumchi 830000China CNPC Engineering Technology R&D Company Limited Beijing 100007China

during the development of low or ultra-low permeability oil resources,the alternative energy supply becomes a prominent *** recent years,carbon dots(Cds)have drawn much attention owing to their application potential in oil fields for reducing injection pressure and augmenting oil ***,carbon dots characterized of small size,high surface energy are faced with several challenges,such as self-aggregation and *** preparation of stably dispersed carbon dots nanofluids is the key factor to guarantee its application performance in *** this work,we investigated the stability of hydrophilic carbon dots(HICds)and hydrophobic carbon dots-Tween 80(HOCds)*** influences of carbon dots concentration,sorts and concentration of salt ions as well as temperature on the stability of Cds were *** results showed that HICds are more sensitive to sort and concentration of salt ions,while HOCds are more sensitive to *** addition,the core flooding experiments demonstrated that the pressure reduction rate of HICds and HOCds nanofluids can be as high as 17.88%and 26.14%,***,the HICds and HOCds nanofluids show a good application potential in the reduction of injection pressure during the development of low and ultra-low permeability oil resources.

关键词： Carbon dots Nanofluids drag reduction Stabilization mechanism Salt tolerance

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Numerical Simulation for the Multi-media dynamic Changes in the Fracturing and development of Tight Oil reservoir 8th

Numerical Simulation for the Multi-media Dynamic Changes in ...

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8th International Field Exploration and development Conference, IFEdC 2019

作者： Fang, Ping-liang Shao, Li-ming Xu, Xian-guang Cheng, rong-chao Kang, Xiao-na CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China Research Institute of Petroleum Exploration and Development PetroChina Beijing China

ISBN: (纸本)9789811524844

In order to identify the function of coupling of flow and deformation during fracturing and development in tight oil reservoir and study the effect on reservoir performances due to the multi-media dynamic changes. Based on the mechanics mechanism of multi-media deformation on tight sandstone reservoir, the coupling of multiphase flow and reservoir deformation during fracturing and production was stated. The dynamic model of reservoir parameters for different development stages and the multiphase seepage mathematical model were established. On this basis, an integration of fracturing and production software module was developed. According to the numerical simulation on staged fracturing of horizontal wells and production in a Xinjiang tight oil field, the changing rules of physical parameters in porous and fracture media were obtained. By using this technology, the deformation law of multi-media in different development stages, such as expansion and contraction, opening and closing, rupture and propagation could be revealed;meanwhile, the effect of coupling of flow and deformation interaction on reservoir performances was analyzed quantitatively. Therefore, numerical simulation for dynamic changes of the multi-media in the fracturing and production can be used to exploit tight oil reservoir highly efficiently. © 2020, Springer Nature Singapore Pte Ltd.

关键词： deformation

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development and Performance Evaluation of New High Temperature resistant Bulk Expanded Polymer Material 8th

Development and Performance Evaluation of New High Temperatu...

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8th International Field Exploration and development Conference, IFEdC 2019

作者： Shao, Li-ming Fang, Ping-liang Wei, Fa-lin Li, Wei-tao dai, Ming-li Research Institute of Petroleum Exploration and Development PetroChina Beijing China CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China

ISBN: (纸本)9789811524844

High temperature-resistant polymer (HTP) was synthesized by in-situ cross-linking of interpenetrating reaction using H-2 monomer containing amide bond and H-1 molecule containing hydroxyl as raw materials. Ir spectra result showed that there were characteristic functional groups of H-1 and H-2 cross bond at the same time, that was to say that H-1 cross-linking reaction and H-2 polymerization could simultaneously take place. The interpenetrating cross-linking structure, extension properties at room temperature and long-term heat resistance properties of the material were tested. The experiment results showed that in the whole range of observations, HTP material cross-links and interpenetrates uniformly. The SEM pictures confirmed the interpenetration structure of HTP material. After cross-linking and interpenetration, the scale of HTP structure became smaller than before. This material had tensile resistance, dispersion stability in water, volume expansion, and could reach the maximum swelling ratio of 1.69 within 1.5 h at room temperature. At 90 °C, 120 °C and 140 °C, after soaking 130 days in formation water, HTP volume reduction rate was 1.57%, 3.24% and 6.82%, respectively. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Heat resistance

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