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Safe Speed-Up drilling technology for Ultra deep Well Based on Geology-engineering Integration 12th

Safe Speed-Up Drilling Technology for Ultra Deep Well Based ...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Chen, Chang-Chang Ji, Guo-dong Wang, Hai-Ge Huang, Hong-Chun Wu, Qiang Liu, Li CNPC Engineering Technology R and D Company Limited Beijing China CNPC Research Institute of Petroleum and Development Beijing China

ISBN: (纸本)9789819919635

Qiulitage tectonic belt in Tarim Basin has large reservoir burial depth and complex geological conditions, and challenges such as ultra deep, high temperature, high pressure and high stress lead to big problems related to well control safety, well construction timeliness and project quality. To solve these key technical problems that set barriers to the process of exploration and development, a set of drilling technology process geology-engineering integration is established with geomechanics as the bridge. And an integrated key drilling engineering technology for the safe speed up of ultra deep well was formed, integrating well location optimization, well trajectory optimization, stratum pressure prediction before drilling, stratum drillability evaluation, bit and speed-up tool design and optimization, so as to solve engineering problems. Combined with seismic data, logging data, structural characteristics, and lithology distribution characteristics, the rock mechanics data volume related to the 3d drilling resistance characteristics of the block was established for the first time, and the vertical and horizontal heterogeneity was quantitatively characterized, which provided a basis for bit design, improvement and optimization. Through field practice, the average drilling complexity rate was reduced from 12% to 4.6%, and the drilling cycle at 8500m depth was reduced from 326 days to 257 days, which were significantly better than those of the vertical wells deployed in the early stage without considering geology-engineering integration. It accumulated technology and experience for the efficient development of ultra deep complex oil and gas reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Integration

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The Successful Application of Expansion Tube technology in the Bongor Basin of Chad 13th

The Successful Application of Expansion Tube Technology in t...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhong, Zhao Li, Xiao-Gang Liu, Ji-Tong Ji, Fei Li, Gang-Lu Jia, Tao Liu, Chen-Chao Zhang, Guo-Bin Liu, Shan-Shan CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing100034 China CNPC Bohai Drilling Engineering Company Limited Tianjin300452 China

ISBN: (纸本)9789819702558

The Bongor is the main basin for increasing storage and production in the cnpc Chad. With the continuous deepening of development, underground safety operations face the following problems: the inability to effectively seal the gas layer in the overlying strata of the basement, the high risk of secondary completion of the basement gas injection well, and the poor stability of the wellbore in the M group shale formation. In response to the bottleneck problems faced by underground operations, geological, drilling, logging, and other data were analyzed and sorted. Based on the expansion tube technology, the safety sealing technology for high-pressure gas cap in basement, secondary completion technology for basement gas injection wells, and openhole sealing technology for expansion tubes were optimized and formed. They were successfully applied for the first time in the Bongor Basin, achieving a daily gas injection volume of 2000 Nm3, shortening the construction cycle, improving wellbore quality, and reducing complex underground risks, Subsequently, it will be widely promoted and applied as a mature technology, supporting the efficient development of the Bongor Basin. At the same time, the expansion tube technology has a demonstration effect on the development of similar oil fields due to its good practical functions and application value [1–6]. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Gases

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The Effect of Polymerization degree of Hydrate Inhibitor on Hydrate Formation: Molecular dynamics Simulations and Experiments 13th

The Effect of Polymerization Degree of Hydrate Inhibitor on ...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Liao, Bo Wang, Jintang Lv, Kaihe Lv, Xindi Wang, Tong Wang, ren Wang, Jianlong Chen, Longqiao Sun, Jinsheng Shandong Qingdao266580 China Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Shandong Qingdao266580 China CNPC Offshore Engineering Company Limited Beijing100028 China

ISBN: (纸本)9789819702671

Natural methane hydrates are estimated to be the largest source of unexploited hydrocarbon fuel. However, there are many difficulties in drilling for natural gas hydrates production, among which inhibiting hydrate generation is an important issue. The conventional thermodynamic inhibitors have difficulties such as large dosages and are not environmentally friendly, while the widely used kinetic inhibitors also suffer from failure with high subcooling. Thus, it is urgent to develop new efficient hydrate inhibitors. Molecular design of hydrate inhibitor molecules using molecular simulations is one of the most common tools used. However, it is challenging to reproduce experimental-scale hydrate inhibitor fractions at the molecular scale. Thus, many studies have only investigated the effect of a minimal number of repeating units in an inhibitor on hydrate stability, leading to conclusions about the effects of various functional groups on hydrate stability. In contrast, a selection of the number of repeating units (polymerization degree, N) in the molecular structure of polymeric hydrate inhibitors has rarely been discussed. In this work, polymer PVP-N with different N was established based on NVP. The effect of a polymer molecular weight on hydrate formation was investigated. The results show that the different N in PVP has a significant effect on a diffusion coefficient of water molecules. A smaller N in PVP is more likely to inhibit hydrate formation during the phase of nucleation, but its effect is significantly weakened during the phase of formation. This study helps us to understand the effect of a polymer molecular weight on the performance of hydrate inhibitors and select an appropriate number of repeating units in molecular modeling, which dramatically reduces the difficulty of designing the molecular structures of hydrate inhibitors and other drilling fluid treatment agents, clarifies the mechanism of action of hydrate inhibitors and other drilling fluid treatm

关键词： Molecular structure

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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...

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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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revealing and Solving the Hidden Hinders for Efficient Shale Gas drilling Based on data Analytics and Machine Learning

Revealing and Solving the Hidden Hinders for Efficient Shale...

引用

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

作者： Zhang, Jiawei Zhuang, Tao Ji, Guodong Huang, Hongchun ding, Zhen Yang, Zhaoliang CNPC Engineering Technology R&D Company Limited Beijing China China Petroleum Technical Service Corporation Limited Beijing China CNPC ChuanQing Drilling Engineering Company Limited Sichuan Chengdu China Engineering Technology Research Institute PetroChina Southwest Oil & Gas Field Company Sichuan Chengdu China

ISBN: (纸本)9781959025269

despite annual production of shale gas exceeding 20 billion cubic meters from Sichuan basin in China, its cost-effective development has been constrained by lengthy drilling cycle of horizontal sections caused by downhole complex such as leakage, stuck pipe, multiple drilling trips due to frequent downhole tool failure, low rOP, bit wear and other related challenges. Progress has been realized in reducing NPT and increasing rOP due to extensive effort in complex prevention and drilling optimization in the last few years. However, little attention has been paid to the influence of downhole vibration and bit wear misjudgment on efficient shale gas drilling. This paper presents the revealing and solving of these two hidden hinders based on data analytics and machine learning. Various sources of data, including over 300 cases of bit records, lithology, elemental logging and downhole vibration measurements from drilled formation for selected representative drill bits, as well as the data from full-scale indoor experiments, were collected for analysis and comparison. The characteristic of bit vibration and rock-breaking efficiency, obtained from five specifically designed 8-1/2″ PdC bits with different levels of worn cutting teeth which were used to drill artificial cores with varying degrees of heterogeneity, were evaluated with data from bit records and downhole measurements. Furthermore, identification of bit wear states was realized to reduce unnecessary POOH by combing rFA and data from bit records. It's revealed that severe downhole vibration, caused by formation heterogeneity and reflected in mineral composition when crossing different layers, is one of previously overlooked causes for downhole tool failure and premature bit wear. Consequently, trajectory optimization was proposed to reduce downhole vibration. Experimental results suggested the wear value of 2-2 should be defined as "critical wear value" for PdC bit as significant difference in rock-breaking perfor

关键词： drills

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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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recommendation of rigless Solution to Ensure Wellbore Integrity and develop Low-Perm reservoirs in Middle East: Maximize Vitality of Coiled Tubing in Staged Fracturing, Water Injection and Fluid Monitoring

Recommendation of Rigless Solution to Ensure Wellbore Integr...

引用

2024 SPE Conference at Oman Petroleum and Energy Show, OPES 2024

作者： Chen, Chen Bai, Haoli Liu, Shanshan Zhao, Shufen Liu, Bingshan Che, Yang Liu, Huifeng CNPC Engineering Technology R&D Company Ltd. China CNPC R&D DIFC Company Ltd. United Arab Emirates

ISBN: (纸本)9781959025252

Low-perm carbonate reservoirs in the Middle East have great potential for development. Hydraulic fracturing is one of the key technologies to unlock their commercial potential. In recent years, an increasing number of oil companies have placed emphasis on the development of low-permeability reservoirs. The Sadi reservoir in Halfaya oilfield (Iraq) is characterized as a medium-porosity, extremely low to ultra-low-permeability limestone reservoir. due to poor reservoir properties, it has remained largely untapped. drawing from mature experiences in developing similar reservoirs globally, the application of multi-stage hydraulic fracturing techniques in horizontal wells, exemplified by the S5H1 well, has been initiated as a pilot test. AdNOC, a decade ago, commenced the development of the Arab d tight oil reservoir. The original acid stimulation plan was modified to a fishbone fracturing completion scheme. This adjustment not only resulted in significant cost savings per well, but also achieved an initial production rate of over 2100 barrels per day, more than triple that of the original plan. The production continues to be stable at present. Besides, AdNOC has been focusing on development of low-permeability (dY Zone A), using MrC (maximum reservoir contact) and compatible reservoir stimulation technologies. In Oman's daleel oilfield, the average thickness of the oil reservoir ranges from 10 to 30 meters, constituting a thin-layered, low-permeability carbonate reservoir. Maintaining the integrity of the wellbore is a critical consideration in the development of low-permeability reservoirs. Poor wellbore integrity can lead to complications in the production stage, resulting in an increasing quantity of inactive strings. To mitigate potential risks, the two-barrier philosophy serves as a guiding principle. This approach mandates the implementation of two independent and tested barriers to prevent issues related to well control during production operations and interventi

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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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