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research Progress and development Trend of Treatment Methods for Annular Pressure in Gas Storage Caverns

Research Progress and Development Trend of Treatment Methods...

引用

International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Liu, Wei Zhang, Wenyao Zha, Chunqing Xu, Chaohui CNPC Engineering Technology R&D company limited China China University of Petroleum Beijing China Beijing University of Technology China

In recent years, pressure in the annulus of gas storage reservoir injection wells has become increasingly common. This presents a significant challenge to the safe and efficient operation of gas storage reservoirs and the integrity of injection wells. This paper presents a systematic introduction to the prevention and control measures of annular pressure. The introduction is based on research into the development status of prevention and control methods both domestically and internationally. The measures mainly include two aspects. Firstly, for the sealing failure of the tubular column, the differential pressure activated blocking agent is used for management. Secondly, for the sealing failure of the cement ring, the sealing agent is managed by extruding cement, resin, and other blocking agents. The text analyses the advantages and disadvantages of the treatment technology in depth, in combination with existing research. The repair methods for gas storage reservoir annulus with pressure have problems such as insufficient construction conditions, poor implementation effect, and limited types of blocking agents available. Additionally, the different working conditions and performances of the reservoir annulus are taken into account. To ensure high efficiency and cost-effectiveness, we propose a new method for treating annulus pressure. This involves repairing any damage to the cement ring, restoring the production packer's seal, and rebuilding the integrity of the old wellbore. By doing so, we can guarantee the safety of gas storage reservoirs throughout the entire injection and production life cycle. It is important to maintain the integrity of the old wellbore to ensure the safety of gas storage during injection and extraction. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Cements

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Study on Annular Pressure Buildup Occurring in the Production String in dual Packer Completion Offshore Heavy Oil Wells 13th

Study on Annular Pressure Buildup Occurring in the Productio...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Hao Zhang, Hui Li, Mu Hao, Wei-Wei Li, Ya-Fei Zhang, Xin Zou, Yi CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering China University of Petroleum Beijing China

ISBN: (纸本)9789819702596

With the continuous development of unconventional resources, offshore heavy oil has attracted wide international attention. Heat fluid huff and puff and dual packer completion technology are often used in offshore heavy oil production. However, the annular pressure buildup caused by heat transfer and fluid expansion in the production has become a serious problem. It has brought a great threat to safe production of heavy oil. In this paper, regarding the dual packer completion and N2 injection, the temperature field in the production string is analyzed based on the heat transfer theory and energy conservation. The prediction method of APB is proposed considering the influence of the axial force and the cemented casing on the annular volume. At last, the mechanical strengths of the tubing and casing strings are evaluated. Analysis results indicate APB in C-annular is higher than that in the other annuli. The bottom of the un-cemented section of each string is most likely to be of failure. With the increase of N2 injection, APB decreases at a declining rate. The comparisons between the calculated value of APB by the proposed method and the measured data show high consistency with prediction errors less than 10%. The model developed in this paper is of referential value for annular pressure buildup mitigation and optimizing cementing operation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Heavy oil production

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Feasibility Analysis on Optimization and Expansion of Ultra-deep Well Casing Program in Fuman Oilfield 13th

Feasibility Analysis on Optimization and Expansion of Ultra-...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Chen, Xue-Feng Chen, Zhi-Xue Wen, Tao Li, Bo Zhai, Wen-Bao Wang, Zheng-Xu Jiang, Ji-Wei Guo, Xiao-Wei Liu, de-Zhi Tan, Peng CNPC Engineering Technology R&D Company Limited Beijing102206 China PetroChina Tarim Oilfield Company Xinjiang Korla841000 China

ISBN: (纸本)9789819702558

With the continuous deepening of exploration and development for Fuman oilfield, the existing casing program fails to effectively deal with downhole problems such as "overflow, leakage and collapse" caused by local high-pressure brine developed layer, leading to longer drilling time and higher drilling safety risk. Therefore, it is urgent to optimize the existing casing program according to the characteristics of geology and engineering to meet the requirements of safe drilling. For this purpose, the three types of pressure profiles in the Fuman oilfield are firstly established by using the drilling, logging, mud logging, and testing data, and the necessary setting points and risk points of geology and engineering are determined. Then, considering the level of drilling technology and the requirements of drilling and completion, the optimization and expansion scheme of casing program is formed. Finally, combined with the drilling parameters, the feasibility analysis of casing program in terms of casing string design, drilling tool strength verification, hydraulic simulation, well control risk assessment, drilling time and drilling cost is discussed. The analysis results show that the optimized casing program can effectively seal the local high-pressure brine developed layer, solve the problem of "overflow, lost circulation and collapse", reduce the downhole problems, and shorten the drilling time by 20 ~ 25 days and save 2 ~ 3 million per well. The investigates indicate that the optimization of the casing program not only effectively makes up for the shortcomings of the current casing program, reduces the drilling risk, and improves the drilling efficiency, but also provides an important reference for the drilling engineering design of the Fuman oilfield. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： risk assessment

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drILLING-PIPE dYNAMIC ANALYSIS ANd VErIFICATION IN HOrIZONTAL WELL 29

DRILLING-PIPE DYNAMIC ANALYSIS AND VERIFICATION IN HORIZONTA...

引用

29th International Congress on Sound and Vibration, ICSV 2023

作者： Zhisheng, Zhang Xiangyang, Wu Jinliang, Zhang Zhidong, Zhang Yan, Mei Gang, Li Junlong, Chen CO. Ltd China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9788011034238

Horizontal well technology is an essential means of enhancing drilling productivity and oil and gas production. However, the deviation angle of horizontal wells is highly variable, resulting in significant drill-pipe friction. due to the influence of its own gravity, the drill-pipe approaches the floor of the wellbore as the horizontal displacement increases. during rotary drilling, the drill-pipe exhibits evident nonlinear characteristics and is susceptible to lateral vibration. This article establishes a mathematical model for the lateral vibration of a horizontal drill-pipe considering the drilling fluid inside the drill-pipe and the drilling fluid in the annulus based on variables such as drilling fluid flow rate, drilling fluid density, drilling fluid viscosity coefficient, gravity, friction, and drilling pressure. The calculation technique is provided, and the displacement equation and vibration frequency equation of the horizontal drill-pipe's lateral vibration are derived. The frequency of lateral vibration under various parameter conditions is analysed using numerical simulation. Moreover, by compiling site-specific data for comparison, it was determined that the model accurately describes the lateral vibration of the drilling string. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： drills

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Study on the Wellbore reconstruction refracturing technology Based on Expandable Tubular

Study on the Wellbore Reconstruction Refracturing Technology...

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2023 SPE/IAdC Middle East drilling technology Conference and Exhibition, MEdT 2023

作者： Guo, H.J. Zhou, Y. Wang, B.d. Zhang, Q.L. Xu, B.G. Jao, T. Zhou, S.H. Drilling Mechanical Department CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781613999974

refracturing is a promising means to improve the output and estimated ultimate recovery of shale oil and gas resources, which is an efficient method to recover the productivity of low permeability old wells. refracturing has achieved good results in the development of shale gas wells in North America, and has increased output and decreased the extraction cost significantly of shale gas resources. The disadvantage of unable to control the fracturing fluid accurately of the conventional temporary plugging diverting refracturing technologies like chemical particulates has been exposed in the applications. Wellbore reconstruction technology based on the solid expandable tubular (SET) was studied in this paper, which is a permanent plugging diverting refracturing technology with a high sealing effect and simple operation. Technical principles, tool structures and construction processes were analyzed and relative laboratory tests were conducted to verify the feasibility of this technology. Meanwhile, comparisons between expandable tubular technology and other refracturing technologies were developed to analyze the application prospect in shale oil and gas resources. The indoor tests indicated that wellbore reconstruction technology based on expandable tubular can plug the perforation on the casing effectively with certain sealing pressure, which showed that this technology can realize the wellbore reconstruction to create the wellbore conditions for the next fracturing work. Compared with other temporary plugging refracturing technologies, the expandable tubular technology can achieve accurate control of fracturing fluid and has a better effect of refracturing work. At the same time, it has the advantages of simple operation and big internal diameter compared to other wellbore reconstruction methods like casing plugging technology, which means that bigger displacement can be used and better effect can be achieved in the refracturing work. The conclusions obtained in this

关键词： Oil field equipment

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development and Performance Evaluation of Environment-Friendly Self-degradable Polymer Film Workover Fluid System 13th

Development and Performance Evaluation of Environment-Friend...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Liu, Jian-Quan Gao, Xiang Xing, Li-Jie Ye, Zhi-Lin Jin, Yi Wang, Zhen-Yuan CNPC Engineering Technology R&D Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Jidong Oilfield Company Tangshan China

ISBN: (纸本)9789819702558

At present, the chelating acid fluid and Prd drilling fluid in the period of well drilling and completion are still applied as the workover fluid in Weizhou Oilfield. Leakage often occurs due to the insufficient plugging ability of chelating acid workover fluid, which will not only lead to the waste of workover fluid but also cause reservoir damage and low oil and gas production. After Prd drilling and workover, it is difficult to break the gel, resulting in plugging and the sharp drop of oil output. The test shows that the lower pay zone has no output, which causes great economic losses and brings great difficulties to the exploitation of oil and gas resources. Aiming at the problems of insufficient plugging performance, poor reservoir protection performance, difficulty in self-plugging removal, and environmental protection of the existing workover fluid system in Weizhou Oilfield, an environment-friendly self-degradable polymer film workover fluid system was developed, and the formula was seawater + 1% dristemp + 3% film-forming agent + 2% bionic inhibitor + 3% super-amphiphobic agent. The system has high temperature stability, good pressure-bearing and plugging performance and water blocking resistance, and can effectively protect the reservoir. In addition, through the environmental protection performance test, it is determined that the formula has excellent characteristics of safety, non-toxicity, and no environmental pollution. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Chelation

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Flow Performance of Two-Phase Fluid in Carbonate Fractured-Vuggy Media under HTHP Conditions

Flow Performance of Two-Phase Fluid in Carbonate Fractured-V...

引用

2024 Abu dhabi International Petroleum Exhibition and Conference, AdIPEC 2024

作者： Sun, K. Zhang, G. Jiang, Q. Fu, J. Liu, Q. Li, r. Jia, W. Zhang, M. Kong, L. CNPC Engineering Technology R&D Company Limited Beijing China CNPC International Hongkong Limited-Abu Dhabi Abu Dhabi United Arab Emirates

ISBN: (纸本)9781959025498

In the middle-late stage of depletion development, water influx and channeling are usually unavoidable in deep carbonate fractured-vuggy reservoirs, which leads to a rapid increase in water cut of production wells, thus significantly reducing the total oil recovery. This study focuses on flow performance of oil and water in carbonate fractured-vuggy media under high-temperature and high-pressure conditions, the two-phase flow characteristics of porous vs. porous-fractured media and fractured vs. fractured-vuggy media are investigated and compared respectively based on lab tests. It is found that oil recovery of waterflooding in the porous-fractured media is only 37.36%, which is much lower than that in the porous media (60.69%), indicating that the presence of fracture can greatly reduce the co-seepage time of oil-water and result in a decrease of total oil recovery. The oil recovery of the fractured and fractured-vuggy media is 85.97% and 53.09%, respectively. The quite obvious difference shows that when the injected water flows into the vug structures along the fracture at a pretty low speed, only part of the oil can be displaced out by the effect of gravity differentiation. The other rest of oil would be widely distributed in the upper part of the vug structures and sealed as remaining oil, which is quite difficult to be driven out. This study reveals the flow law of two-phase fluid in fractured-vuggy media under HTHP conditions, providing novel insights into flow mechanisms of carbonate reservoirs with different scales of flow and storage structures. Copyright 2024, Society of Petroleum Engineers.

关键词： Two phase flow

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The development and Laboratory Evaluation of Biodiesel Lubricant Bd-1 for drilling Fluid 13th

The Development and Laboratory Evaluation of Biodiesel Lubri...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhang, Kui Nie, Jie-Jing Fang, Ye-Xin CNPC Engineering Technology R&D Company Limited Beijing102206 China Beijing Petroleum Machinery Co. DRI of CNPC Beijing100083 China

ISBN: (纸本)9789819702558

In order to develop efficient, low-fluorescence, biodegradable lubricant for water based drilling fluid, biodiesel is used to compound Bd-1 lubricant. Lubrication mechanism is analysed in the process of drilling. The formula of compounded lubricant Bd-1 is got by optimizing experiment of emulsifier, extreme-pressure lubricant, and solid lubricant. Laboratory evaluation results show that Bd-1 lubricant is of no flsorescence, good lubricity in base mud and weighted drilling fluid, salt resistance, compatibility with drilling fluid, heat resistance and biodegradability. Bd-1 lubricant is up to the requirement of Q/SY17088-2016. The decreasing rate of extreme pressure lubricating factor is above 90%, which is as low as 0.02 when 2%Bd-1 is under the condition of 160 ℃. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Emulsification

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Cross-network node alignment algorithm based on following relationship and username similarity 3

Cross-network node alignment algorithm based on following re...

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3rd International Conference on Advanced Algorithms and Signal Image Processing, AASIP 2023

作者： Cai, Jiati Yu, Tong University of Electronic Science and Technology of China China CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781510668522

With the enhancement and enrichment of social media, cross network node alignment algorithms are playing an increasingly important role in interest recommendation and security protection. However, the performance of the same user in different online social networks platforms may differ due to the heterogeneous characteristics of the platform or unclear personal characteristics, which correspondingly poses many challenges. Existing cross network node association methods are restricted by the forgery of attributes and the time complexity of processing user generated content, and the overall effect is not ideal. This article mainly proposes a cross network node alignment algorithm based on friend following relationships and username similarity in different networks in online social networks. Using social network relationships to generate model vectors for two networks, and generating transformation matrices based on training sets, calculate confidence based on friend relationships for test samples, and organically combine the similarity of user names between the two networks to make associated user predictions, thereby linking the accounts of entities in the two networks and achieving node alignment. Experimental results indicate the node alignment method can achieve satisfactory performance. © COPYrIGHT SPIE. downloading of the abstract is permitted for personal use only.

关键词： Social networking (online)

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Intelligent Optimization of drilling Parameters Based on Multiple drilling Agents

Intelligent Optimization of Drilling Parameters Based on Mul...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Pei, Zhijun Song, Xianzhi Hu, Zhijian Pan, Tao School of Petroleum Engineering China University of Petroleum Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025184

drilling parameter optimization is one of the important ways to improve drilling efficiency and reduce drilling cost. Multi objective intelligent optimization technology has the characteristics of comprehensive consideration of factors and fast solution speed, and is suitable for drilling parameter optimization scenarios. Based on the drilling data of a vertical well in Tarim Oilfield, the rate of penetration (rOP) prediction agent, pipe string friction calculation agent and bottom hole cleanliness agent are established by using artificial intelligence or mechanism methods. Based on non-dominated sorting genetic algorithm II(NSGA-II), several established drilling agents are combined, and intelligent optimization model of drilling parameters is established. The evaluation function of the drilling scheme is set up to select the optimal drilling parameter optimization scheme from numerous Pareto solutions under the condition of ensuring operation safety, and the scheme is applied and verified in this well for Kangcun Formation and Jidik Formation with low rOP. According to the optimization results of drilling parameters, under the condition of ensuring the bottom hole cleaning and normal drilling, compared with the previous drilling plan, the rOP of Kangcun formation is increased from 3.43m/h to 7.72m/h;The rOP of Jidik formation is increased from 4.76m/h to 8.84m/h. The rOP of the two formations has been increased by 125.1% and 85.7% respectively, which can shorten the drilling cycle and reduce the drilling cost to a certain extent. Copyright © 2024, International Petroleum technology Conference.

关键词： drilling Agent drilling parameter optimization NSGA-II

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