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Practical Application of Geological engineering Integrated Horizontal Well drilling technology in Complex Fault Block reservoir of Niger 13th

Practical Application of Geological Engineering Integrated H...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jing, Ning Liu, Ji-Tong Liu, Yu-Han Qian, Feng Zhou, Chuan Ye, dong-Qing Yu, Gang Shi, Xiu CNPC Niger Petroleum S.A Niamey Niger CNPC Engineering Technology R&D Company Limited Beijing China Petroleum Engineering Research Institute of Dagang Oilfield Tianjin China GWDC Drilling Technology Service Company Beijing China

ISBN: (纸本)9789819702558

Niger is located in the hinterland of Sahara desert, where fault blocks are scattered and distributed in a zonal pattern. The typical fault block, dibeilla N-1, whose reservoir is shallow and heterogeneous, and developed with strong edge-bottom water. The implementation of horizontal Wells faces many technical problems, such as formation identification while drilling, orientation in large porous sandstones, trajectory precise control and selection of completion method. Through technology integration and innovation, the geological engineering integrated horizontal well drilling technology of Niger is established. This technology integrates Petrochina's independent innovation product Near-bit Geosteering System (CGdS), establish an integrated geoengineering steering model. Based on the EICS remote technical support platform, the remote geosteering tracking decision and engineering parameter optimization while drilling operation mode are created, and the AICd intelligent flow control water sand control completion tool is selected. The application of the geology and engineering integrated horizontal well drilling technology supported the successful drilling of the first 6 horizontal Wells in the Niger project, realizing the precise control of the reservoir trajectory of horizontal Wells, the formation identification thickness of 2 m, the target rate of 100%, the reservoir drilling rate of 92%, the production of a single well increase by 2.3 times, effectively prolonging the water-free oil production cycle, and effectively supporting the goal achievements of high-production with few wells and high-efficiency development. It provides practical experience for the development and construction of the same type of reservoir. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Horizontal wells

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Analysis and countermeasures of drilling challenges in complex ultra-deep exploration wells in thrust structural belt with multiple salt layers 6

Analysis and countermeasures of drilling challenges in compl...

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2023 6th International Workshop on Environment and Geoscience, IWEG 2023

作者： Zhang, Wei Zhou, Tuo Jin, Yulai Xiao, Yue Li, Hangyuan Baletabieke, Bahedaer Gu, Yixin CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering Beijing China

The deep and ultra-deep zones of Bokhtar oilfield in Tajikistan are the critical blocks for future exploration and development, which are imbedded between two salt layers, accompany with four reservoir and cap assemblages of middle and upper Jurassic, Lower Cretaceous, Upper Cretaceous and Paleogene. The reservoir and cap assemblages of pre-salt carbonate and salt-gypsum cap have great potential. The complicated geological structure, uncertain formation and non-developed pre-salt formations made the critical challenges for drilling operation, including: (1) The difficult casing program design caused by peripheral compression and thrust of the basin, the complicated geological structure, the large geological difference above and below the salt layer, the unfaithful prediction of multiple sets of salt layer, great formation pressure uncertainty, and many sealing points;(2) The upper salt formations are featured by developed thrust belt and large dip angle, the contradiction between deviation prevention and drilling acceleration in high steep structure is prominent, and the wellbore quality is difficult to control;(3) due to the mud loss in upper salt layer, loss coexisted with blow out in the salt layer and inaccurate prediction of salt bottom, the drilling complexes such as mud loss, overflow and well collapse are occurred frequently;(4) Ultra-deep well depth (over 7000m), HTHP (180°C,140MPa), multiple salt layers and long open hole section made high requirements on high temperature resistance of drilling fluid, cementing slurry and downhole tools, as well as high drilling risk and cost. It is necessary to carry out the drilling difficulties investigation of ultra-deep exploration well under the consideration of pertinence, safety, applicability and economy, then formed the suitable drilling engineering plan for Bokhtar Block through the optimization of domestic and foreign advanced and mature deep and ultra-deep well technologies, which is used to provide the techni

关键词： Quality control

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Study on Fracture Propagation in Tight Sandstone by Large-Scale Physical Simulation Experiments 12th

Study on Fracture Propagation in Tight Sandstone by Large-Sc...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Li, Jia-Ying Qi, Chun-Yan Wu, Bo-Hong Gu, Ye Zhou, Tuo CNPC Engineering Technology R&D Company Limited Beijing China CNPC Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789819919635

Physical simulation experiment on hydraulic fracturing is an effective and reliablemethod to understand the initiation and propagation of hydraulic fractures. However, shale and cement samples are mostly used in current experiments, while tight sandstone is seldom studied. Besides, the experiments are usually conducted with single-stage fracturing, ignoring the interaction between fractures in the actual fracturing. In this paper, a pioneer large-scale physical simulation experiment is conducted by multi-stage hydraulic fracturing to reveal the initiation and propagation of fracture in tight sandstone. Two groups of tight sandstone samples were prepared as the size of 28 × 28 ×36,where four circular notches were designed on the wellbore to represent fracturing clusters. The tests were performed by a large block polyaxial stress frame and the acoustic emissions data were observed to indicate the features of fracture complexity. Consequently, the effects of hydraulic fracture interaction, pumping rate and rate pulsing on fracture propagation were studied. The results showed that the simple fractures were mainly formed in tight sandstone, while the complex fractures were rarely formed since the mutual inhibition between fractures under stress shadow. The fracture initiation and breakdown pressures increase gradually with the pump rate, while the rate change has no significant effect on the fracture radius. The rate pumping can effectively increase fracture complexity, further improving the effect of reservoir stimulation. This work successfully reveals the effects of different factors on fracture initiation and propagation, offers an innovative method of physical simulation experiment on hydraulic fracturing, and provides a significant reference for fracturing design optimization of tight sandstone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Fracture

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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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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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Critical Length Analysis for Linear Growth of Frictional resistance of Moving Flexible Screen String in Horizontal Borehole 13th

Critical Length Analysis for Linear Growth of Frictional Res...

引用

13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Yong-Hong Gao, Xiang Liu, Xin-Yang Hu, Zhong-Zhi CNPC Engineering Technology R&D Company Limited Beijing102206 China School of Mechanical Engineering Sichuan University of Science and Engineering Sichuan644000 China

ISBN: (纸本)9789819702558

Aiming at the sand control problem of screen in ultra-short radius horizontal well, the influence factors of motion resistance and extension length of flexible screen are studied. Therefore, based on the theory of multi-body dynamics, a mathematical model of the downhole motion resistance of the flexible screen with spherical hinge connection was established, and the simulation model of the motion resistance of the flexible screen was constructed by AdAMS software, and the influence of multiple factors on the model of the pipe string was analyzed. The results show that the motion resistance of flexible screen increases exponentially with the increase of the total length of screen and the friction coefficient. There is a critical length with linear increase of motion resistance, and the main factors affecting the critical length are the length of screen element and the friction coefficient. Under limited thrust, increasing the length of the screen unit and reducing the downhole friction coefficient are beneficial to improve the critical length of flexible screens in downhole operations. In addition, considering the accumulation rate of downhole resistance, a local weight reduction method for flexible screen is proposed, which can not only improve the critical length, but also ensure the reliability and safety of the screen operation. This study aims to provide a theoretical basis for mastering the change law of motion resistance and extension length of flexible screen with spherical hinge connection, and provide a reference for the optimization design of flexible screen. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Friction

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research on the rock cutting mechanism of non-planar PdC cutters based on the drucker-Prager criterion 57

Research on the rock cutting mechanism of non-planar PDC cut...

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57th US rock Mechanics/Geomechanics Symposium

作者： Sun, Yuqi Liu, Li Jiang, Haichao Yu, Jinping Ji, Guodong Wu, Qiang Chen, Changchang CNPC Engineering Technology R&D Company Limited Beijing102206 China International Engineering Company BHDC Tianjin300450 China

ISBN: (纸本)9780979497582

Non-planar PdC cutters are widely used to solve these problems of wear and breakage of conventional PdC cutters when drilling hard rock formations. In this paper, the finite element method is adopted to study the rock-breaking characteristics of non-planar PdC cutters. The effects of the cutting parameters on the rock-breaking efficiency of a non-planar PdC cutter are analyzed. The mechanical specific energy (MSE) of non-planar PdC cutters is smaller. The rate of penetration (rOP) is higher, and the aggressiveness is stronger. The influence of different cutting parameters on the rock-breaking efficiency of four types of PdC cutters is analyzed. The results indicate that the optimum cutting depth is in the range of 1.5-2 mm, and the optimum cutting angle is in the range of 15°-20°. Based on the finite element simulation results, a personalized PdC bit is designed and successfully applied to Yang101HXX-3 well. The research results can provide a theoretical basis for the selection, structure optimization, drilling bit design, and application of efficient PdC bits. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Finite element method

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research on Fault diagnosis System of Key drilling Equipment Based on Internet of Things 13th

Research on Fault Diagnosis System of Key Drilling Equipment...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Luo, Xue-Li Jin, Yi Yang, Xiao-Guang Jia, deng Su, Yong Zhang, Yi Wang, Yong-Chao Chen, Bing-deng Bai, Han-Qin CNPC Engineering Technology R&D Company Limited Beijing China Beijing Kembl Petroleum Technology Co. Ltd. Beijing China

ISBN: (纸本)9789819702718

As the important equipment in the oil drilling rig system, the operation status of drilling pump and winch directly affects the safety and efficiency of oilfield drilling production. The existing inspection and maintenance of drilling equipment mainly rely on manual patrol inspection and post-maintenance. The intelligent monitoring and health diagnosis technology of drilling key equipment can help to realize the life cycle management of drilling key equipment and significantly improve the level of drilling equipment evaluation business. For the health monitoring and fault diagnosis analysis of drilling pump and winch, this paper focuses on the research and design of the online monitoring and fault diagnosis system of drilling pump and winch using the Internet of Things technology. This system can realize remote real-time monitoring and fault diagnosis of the drilling process, reduce the workload of on-site personnel, improve the management efficiency of equipment, and more safely ensure the exploration and development of oil and gas resources. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Failure analysis

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dynamic response Mechanism of Borehole Breathing in Fractured Formation 30th

Dynamic Response Mechanism of Borehole Breathing in Fracture...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Gao, reyu Cui, Yi Wang, Ge Zhao, Fei ding, Yan CNPC Engineering Technology R&D Company Limited Building 1-Courtyard 5-Huanghe Street-Changping District Beijing102200 China

ISBN: (纸本)9783031829062

The ongoing advancement in the exploration and development of oil and gas resources has shifted focus towards deep and ultra-deep layers, emerging as the primary arena for oil and gas exploration and development in China. The intricate fractured reservoir environment, characterized by a narrow safe density window and borehole breathing during drilling, presents substantial challenges to ensuring safe and efficient drilling operations in deep reservoirs. Borehole breathing-induced return of drilling fluid can be easily misinterpreted as a well kick, leading to the implementation of erroneous well control measures that significantly impact the safety and efficiency of deep drilling. To gain a more comprehensive understanding of the dynamic response mechanism associated with borehole breathing in fractured reservoirs, as well as to elucidate alterations in fluid and rock behavior during this process, this study has developed an innovative model for simulating borehole breathing within fractured reservoirs. This model is grounded on the permeability and fluid flow principles governing non-Newtonian fluids, employing dual porous medium stress coupled with flow methodologies to effectively simulate and quantify both the loss and return of drilling fluid within the borehole during instances of borehole breathing within deep fractured reservoirs, along with changes occurring within fractures. The model underwent validation through the utilization of field data and case studies. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Non Newtonian flow

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Technologies and Achievements for drilling and Completion of Onshore deep and Ultra-deep Wells in China

Technologies and Achievements for Drilling and Completion of...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Zhang, Jiawei Wang, Haige Ji, Guodong Cui, Meng Chen, Lili Li, Wenzhe Liu, Li CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Southwest Oil & Gas Field Company Sichuan China Engineering Technology Research Institute PetroChina Southwest Oil & Gas Field Company Sichuan Chengdu China

ISBN: (纸本)9781959025436

In the last decade, newly discovered oil and gas reservoirs have gradually shifted from shallow-medium to deep and ultra-deep layers globally. China also has great potential in deep and ultra-deep oil and gas resources, which is identified as the main frontiers due to the increasing difficulty in maintaining economic and sustainable hydrocarbon production from shallow-medium fields after long-term continuous exploitation. The cost-effective E&P of deep and ultra-deep oil and gas resources are crucial for achieving China's energy transition and succession strategy. This paper reviews numerous challenges encountered during the drilling and completion of deep and ultra-deep wells, including down-hole tool failure due to ultra-high temperature, well control risks from ultra-high pressure, well control or leakage risks due to the narrow pressure window, low rOP due to high strength and abrasive formations, and pipe stuck or wellbore stability problems in salt or mudstone layers. The paper also presents the breakthroughs and applications of high-end equipment, cutting-edge tools and core downhole fluids developed to overcome these challenges, ensuring safe and efficient drilling and completion operations of deep and ultra-deep wells. With successful breakthroughs and applications of technologies including the 12000m drill rig, wellbore structure optimization, managed-pressure drilling, efficient drill bits, drilling speed-up, ultra-high temperature resistant and high-density drilling fluids, leakage prevention, cementing, ultra-high temperature and pressure resistant oil testing and completion, and ultra-deep coiled tubing equipment, the number of onshore deep and ultra-deep wells in China has been increasing in recent years. Continuous improvements have been achieved in technical performance indicators such as the drilling cycle, rOP and other metrics. Over 200 wells successfully drilled with Md exceeding 8000m have enabled China to normalize 8000m ultra-deep onshore dri

关键词： Coiled tubing

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