Natural Gas Industry B最新文献

Development and performance of CO2-responsive foam fracturing fluid 二氧化碳响应型泡沫压裂液的研制与性能研究

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.002

Mingwei Zhao , Yizheng Zhang , Xiangjuan Meng , Xuguang Song , Yingnan Wang , Zixuan Wang , Caili Dai

CO₂ foam fracturing fluid can effectively integrate CCUS technology into oil and gas field development, and its core advantages include low water consumption, excellent flowback performance, and strong sand-carrying capacity. For these reasons, it has received increasing attention in the oil and gas field development field. However, this type of fracturing fluid still has some prominent problems: The residue from gel breaking can easily cause formation pollution, the system cost is relatively high, and the utilization rate is low, which forms a significant technical bottleneck. In response to these issues, this study, based on the theory of clean fracturing fluid gel breaking without residue and the reusability of CO₂-responsive wormlike micelles, innovatively combines CO₂-responsive wormlike micelles with different types of surfactant-based foaming agents to construct a new CO₂-responsive foam fracturing fluid system. A systematic performance evaluation of the system was conducted to clarify its defoaming rules under different temperature conditions. Compared with the traditional guar gum CO₂ foam fracturing fluid, the new system has significant performance advantages. At 90 °C, its foam comprehensive value reached 19720 mL·min, 6150 mL·min higher than the guar gum fluid. After a 5400 s high-temperature and high-shear test at the same temperature, the residual viscosity of the new system was 67 mPa·s, which is higher than the guar gum fluid. This CO₂-responsive foam fracturing fluid simultaneously possesses the application potential of both clean fracturing fluid and foam fracturing fluid. It can effectively solve key problems such as formation pollution and low system utilization rates, and laboratory evaluation experiments confirmed its excellent foaming and rheological properties. These results are of great significance for promoting CO₂ foam fracturing technology to reach an advanced international level and supporting the low-carbon and high-efficiency development of unconventional oil and gas resources in China.

CO2泡沫压裂液可以有效地将CCUS技术融入油气田开发，其核心优势是耗水量低、返排性能优异、携砂能力强。因此，在油气田开发领域越来越受到重视。但该类型压裂液仍存在一些突出问题：破胶后的残留物容易造成地层污染，系统成本较高，利用率较低，形成了明显的技术瓶颈。针对这些问题，本研究基于清洁压裂液无残留破胶理论和响应co2的蠕虫状胶束的可重复使用性，创新性地将响应co2的蠕虫状胶束与不同类型的表面活性剂基发泡剂相结合，构建了一种新型的响应co2的泡沫压裂液体系。对该体系进行了系统的性能评价，阐明了其在不同温度条件下的消泡规律。与传统的瓜尔胶CO2泡沫压裂液相比，新体系具有显著的性能优势。在90℃时，其泡沫综合值达到19720 mL·min，比瓜尔胶液高6150 mL·min。在相同温度下进行5400 s高温高剪切试验后，新体系的残余粘度为67 mPa·s，高于瓜尔胶液。这种二氧化碳响应型泡沫压裂液同时具有清洁压裂液和泡沫压裂液的应用潜力。可有效解决地层污染和系统利用率低等关键问题，实验室评价实验证实了其优异的发泡和流变性能。这些成果对于推动CO2泡沫压裂技术达到国际先进水平，支持中国非常规油气资源低碳高效开发具有重要意义。

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引用次数: 0

Enhancing offshore oil and gas platform sustainability through wind-powered hydrogen production 通过风力制氢提高海上油气平台的可持续性

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.001

Jiayi Wang , Shaohua Nie , Yu Gao , Peng Zheng , Zhihao Su , Jianqiang Sun , Dangfei Wang , Shouwei Zhou , Jiwei Wu

Decarbonizing offshore oil and gas platforms has become a critical challenge in the energy transition. In this article, we propose the following two models for decarbonizing offshore oil and gas platforms to facilitate highly challenging energy transitions: (1) repurposing decommissioned platforms as offshore wind–hydrogen hubs and (2) integrating offshore wind power and hydrogen production systems into operational platforms. This study is conducted to systematically assess the feasibility of the proposed models and further examine their technological challenges, systemic risks, and possible mitigation pathways. The results showed that wind turbines, reverse osmosis desalination, and alkaline water electrolysis have high levels of maturity, whereas subsea hydrogen pipelines and liquid/compressed hydrogen carriers remain comparatively immature. Both models can significantly lower costs, strengthen energy resilience, and reduce emissions. However, large-scale deployment is generally constrained by high capital costs, integration complexity, and fragmented regulatory frameworks. The findings highlight that reusing offshore infrastructure to integrate offshore wind power and hydrogen production systems offers cost and environmental advantages over conventional decommissioning, while integrated supply systems can ensure long-term stability through multi-energy complementarity. The study provides strategic insights for advancing low-carbon transformation and guiding the sustainable and resilient development of offshore energy systems.

海上油气平台脱碳已成为能源转型的关键挑战。在本文中，我们提出了以下两种海上油气平台脱碳模式，以促进极具挑战性的能源转型：(1)将退役平台重新用作海上风能和氢气中心；(2)将海上风电和氢气生产系统集成到运营平台中。本研究旨在系统地评估所提出模型的可行性，并进一步研究其技术挑战、系统性风险和可能的缓解途径。结果表明，风力涡轮机、反渗透海水淡化和碱性电解具有较高的成熟度，而海底氢气管道和液体/压缩氢气载体相对不成熟。这两种模式都可以显著降低成本，增强能源弹性，并减少排放。然而，大规模部署通常受到高资本成本、集成复杂性和分散的监管框架的限制。研究结果强调，与常规退役相比，再利用海上基础设施整合海上风电和制氢系统具有成本和环境优势，而集成供应系统可以通过多能互补确保长期稳定性。该研究为推进低碳转型和指导海上能源系统的可持续和弹性发展提供了战略见解。

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引用次数: 0

Research progress on numerical simulation methods and models for underground coal gasification 煤地下气化数值模拟方法与模型的研究进展

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.007

Xiang'an Lu , Shanshan Chen , Zhen Dong , Jin Sun , Liangliang Jiang

Coal underground gasification (UCG) transforms the physical extraction of coal into the chemical extraction of gas, which is effective for exploiting deep coal deposits. Numerical simulation technology for UCG is a crucial tool for studying the complex processes involved in coal gasification. This study was conducted to determine the direction in which UCG numerical simulation is developing, specifically by reviewing the research progress and achievements made in this area and identifying the existing problems and future research directions. The findings indicate the following: (1) Research has focused on the reaction issues of coal underground gasification, considering mass and heat transfer effects and gasification cavity expansion. Chemical equilibrium, gasification block, packed bed, and gasification channel models have been developed, which have certain advantages in solving gasification reaction problems influenced by cavity structure and reasonable simplifications capable of describing local issues. (2) The dynamic description of gasification cavity structures is a challenging problem that UCG numerical simulation needs to address. The cavity expansion mechanism includes thermochemical consumption, coal spalling, roof collapse, and debris accumulation. Thermochemical consumption causes the mechanical properties of coal and rock to change, leading to spalling under stress. (3) Process models emphasize dynamic simulations of the gasification process, including cavity evolution and gasification products. The reactor combination model, continuous medium equivalent model, and multimodule integration model are primarily used. (4) Future UCG numerical simulation technology development will prioritize modularity, systematization, and intelligence. There is an urgent need to facilitate the chemical reaction kinetics of large coal blocks, the coupling of discontinuous media, and the integration of multifunctional systems, including that of numerical simulation technology with artificial intelligence. With continuous improvements, numerical simulation technology will play a greater technical supporting role in UCG industrialization.

煤地下气化将煤的物理开采转化为煤气的化学开采，是开采深部煤层的有效方法。煤气化过程数值模拟技术是研究煤气化复杂过程的重要工具。本研究通过对UCG数值模拟的研究进展和取得的成果进行综述，明确存在的问题和未来的研究方向，确定UCG数值模拟的发展方向。研究结果表明：(1)研究重点是煤地下气化反应问题，考虑了传质传热效应和气化空腔膨胀。化学平衡模型、气化块模型、填充床模型和气化通道模型在解决受空腔结构影响的气化反应问题方面具有一定的优势，并进行了合理的简化，能够描述局部问题。(2)气化空腔结构的动态描述是UCG数值模拟需要解决的难题。空腔膨胀机制包括热化学消耗、煤剥落、顶板坍塌和岩屑堆积。热化学消耗导致煤和岩石的力学特性发生变化，导致应力作用下的剥落。(3)过程模型强调气化过程的动态模拟，包括空腔演化和气化产物。主要采用反应器组合模型、连续介质等效模型和多模块集成模型。(4)未来UCG数值模拟技术发展将以模块化、系统化、智能化为重点。大煤块的化学反应动力学、不连续介质的耦合以及包括数值模拟技术与人工智能在内的多功能系统的集成，都迫切需要促进。随着数值模拟技术的不断完善，数值模拟技术将在UCG产业化中发挥更大的技术支撑作用。

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引用次数: 0

The process and trends of China's energy transition and the strategic repositioning of natural gas 中国能源转型的过程、趋势与天然气的战略重新定位

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.004

Xiucheng Dong , Qi Gong , Yang Li , Zhaoyang Kong

China's pursuit of its dual carbon goal has turned the country's energy transition and the role of natural gas into key concerns for policymakers and researchers. This study adopts a macro-level analytical approach when reviewing national energy and climate policies together with recent data to assess energy-transition progress and the role of gas in this transition. The study's main findings are as follows: (1) China's energy transition has made clear progress in terms of targets, institutions, and the energy mix; however, it continues to face major problems, such as coal dependence, a rigid industrial structure, and weak incentives for low-carbon energy. In addition, a basic transition pathway is taking shape marked by five main trends: advancing the dual-carbon goals, building a new energy system, developing a new power system, implementing carbon-emission dual control, and improving the national carbon market; (2) The historical evolution of Chinese natural gas industry shows that gas is now mainly positioned as a clean fuel whose core function is to replace coal and improve environmental quality; (3) In the future energy transition, the role of natural gas can be defined: a buffer for energy security, a flexible resource for balancing the power system, and an important source of low-carbon hydrogen and chemical feedstocks. Overall, the study concludes that policy efforts should focus on strengthening the multiple functions of natural gas under tight carbon emission constraints to better support China's long-term low-carbon development.

中国对双碳目标的追求，已使该国的能源转型和天然气的作用成为政策制定者和研究人员关注的关键问题。本研究在审查国家能源和气候政策时采用宏观层面的分析方法，并结合最近的数据来评估能源转型进展和天然气在这一转型中的作用。研究发现：(1)中国的能源转型在目标、制度和能源结构方面取得了明显进展；然而，中国仍然面临一些重大问题，如依赖煤炭、产业结构僵化、低碳能源激励不力等。以推进双碳目标、构建新能源体系、发展新电力体系、实施碳排放双控、完善全国碳市场五大趋势为主要特征的转型路径基本形成；(2)中国天然气工业的历史演变表明，天然气目前主要定位为清洁燃料，其核心功能是替代煤炭和改善环境质量；(3)在未来的能源转型中，天然气的作用可以定义为：能源安全的缓冲、平衡电力系统的灵活资源、低碳氢和化工原料的重要来源。总体而言，研究认为，在严格的碳排放约束下，政策应侧重于加强天然气的多种功能，以更好地支持中国的长期低碳发展。

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引用次数: 0

Wellbore stability analysis considering rock damage mechanics theory: An integrated experimental and numerical study 考虑岩石损伤力学理论的井筒稳定性分析：实验与数值结合研究

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.005

Fei Liu , Ze Li , Jian Min , Yang Peng , Huan Peng , Songhai Qin , Yuntao Liu , Jian Xiong , Ruowen Yu

Conventional geostress evaluation methods often assume static rock properties and neglect the dynamic degradation of mechanical parameters caused by damage evolution during drilling and fracturing processes, which significantly limits prediction accuracy. To address this gap, this study develops a multiphysics-coupled numerical framework integrating COMSOL Multiphysics and MATLAB, grounded in damage mechanics theory, to quantitatively investigate the control mechanism of progressive rock damage on geostress redistribution. By establishing a damage constitutive model coupled with thermo-hydro-mechanical interactions, we simulate the dynamic evolution of rock damage and its impact on stress field reorganization during wellbore operations. Key results demonstrate that (1) incorporating damage evolution leads to substantial deviations in both the magnitude and spatial distribution of geostress, with stress perturbations highly localized within damage zones; (2) changes in mechanical parameters—particularly elastic modulus and permeability—dominate stress adjustments, with heightened sensitivity in formations with low elastic moduli and high permeability; and (3) Poisson's ratio has a negligible influence, whereas permeability variation becomes critically important in low-stiffness formations. Field validation via leakage case analyses in the Wujiaping Formation confirms that the proposed method significantly enhances prediction accuracy compared with conventional approaches. This work elucidates the multiscale interdependency between damage and stress evolution by offering a physics-based framework to optimize drilling and stimulation design in heterogeneous reservoirs.

传统的地应力评价方法通常假设岩石的静态特性，忽略了钻井和压裂过程中损伤演化引起的力学参数的动态退化，严重限制了预测精度。为了解决这一问题，本研究基于损伤力学理论，开发了一个集成COMSOL Multiphysics和MATLAB的多物理场耦合数值框架，定量研究岩石渐进损伤对地应力重分布的控制机制。通过建立热-水-力耦合的损伤本构模型，模拟井筒作业过程中岩石损伤的动态演化及其对应力场重组的影响。结果表明：(1)考虑损伤演化导致地应力的大小和空间分布存在较大偏差，应力扰动高度局限于损伤区内；(2)力学参数（尤其是弹性模量和渗透率）的变化主导应力调整，在低弹性模量和高渗透率地层中敏感性更高；泊松比的影响可以忽略不计，而渗透率变化在低刚度地层中变得至关重要。通过对吴家坪组泄漏实例的现场验证，与常规方法相比，该方法显著提高了预测精度。这项工作通过提供基于物理的框架来优化非均质油藏的钻井和增产设计，阐明了损害和应力演化之间的多尺度相互依赖关系。

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引用次数: 0

Experimental study on hydraulic fracture propagation in middle-deep shale gas reservoirs in the southern Sichuan Basin: The effects of vertical heterogeneity 川南中深层页岩气藏水力裂缝扩展实验研究：垂向非均质性影响

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.003

Dongchen Liu , Jianfa Wu , Shengxian Zhao , Xuanhe Tang , Deliang Zhang , Qian Wang , Shan Huang , Chenglin Zhang , Peng Tan

During the hydraulic fracturing of shale gas in the southern Sichuan Basin, China, field monitoring data have shown that hydraulic fracture (HF) propagation is restricted by height and cannot sufficiently cover vertical pay layers. The geomechanical behavior of gas shale in this region creates heterogeneity between the layers, which is responsible for the height restriction of HF propagation and limits the safe and efficient development of shale gas reservoirs in this region. To study vertical HF propagation, we conducted a series of laboratory hydraulic fracturing experiments under true triaxial loading. Three kinds of heterogeneity factors were tested: stress, elasticity, and interface strength. Analysis of fracture morphology and injection pressure curves resulted in several findings: (1) four types of vertical HF shapes emerged: I-shape, restricted I-shape, T-shape, and H-shape; (2) HF was induced by weakly cemented interface(s) with height limitations, while a layer under larger stress (e.g., 6 MPa) restricted fracture propagation in the middle layers, and heterogeneous elasticity was resistant; (3) regarding the geomechanical status of Changning middle-deep gas shale, interface strength may be more significant than fracture height. This study demonstrates the role of vertical heterogeneity in limiting fracture height and provides theoretical support for hydraulic fracturing optimization in this region.

在川南页岩气水力压裂过程中，现场监测数据表明，水力裂缝扩展受高度限制，不能充分覆盖垂向产层。该地区页岩气的地质力学行为造成了层间非均质性，限制了高频传播的高度，限制了该地区页岩气藏的安全高效开发。为了研究HF的垂直传播，我们进行了一系列真三轴载荷下的室内水力压裂实验。测试了三种非均质性因素：应力、弹性和界面强度。通过对裂缝形态和注入压力曲线的分析，发现：(1)垂直HF形态出现了4种类型：i型、受限i型、t型和h型；(2) HF是由具有高度限制的弱胶结界面引起的，而较大应力（如6 MPa）的层限制了中间层的裂缝扩展，并具有抗非均质弹性；(3)就长宁中深层气页岩的地质力学状况而言，界面强度可能比裂缝高度更为重要。该研究揭示了垂向非均质性对裂缝高度的限制作用，为该区域水力压裂优化提供了理论支持。

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引用次数: 0

Multifractal characteristics of nanopores in the Zhaotong national shale gas demonstration area, Southern Sichuan Basin, China 川南昭通国家级页岩气示范区纳米孔隙多重分形特征

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.008

Yangming Li , Ziqi Feng , Qin Zhang , Shang Xu , Wei Wang , Hao Li , Shangwen Zhou

The multifractal characteristics of organic-rich shale developed along the margins of basins are essential for understanding reservoir heterogeneity, gas storage mechanisms, and the identification of favorable exploration targets. This study systematically investigates the pore structure of marine shale in the Zhaotong area of the National Shale Gas Exploration Demonstration Area in China by integrating analytical methods such as X-ray diffraction, low-pressure N₂ adsorption, and field emission scanning electron microscopy with the Frenkel-Halsey-Hill fractal model. The results reveal that: (1) four distinct shale lithofacies (SL) types were identified—argillaceous/siliceous mixed SL (Type I: M-2), carbonate/siliceous mixed SL (Type II: M and M-1), argillaceous-rich siliceous SL (Type III: S-3), and carbonate-rich and argillaceous/carbonate siliceous SL (Type IV: S-1 and S-2); (2) Types II and IV generally exhibit higher fractal dimensions (D₁, D_2, and D₃) than Types I and III, indicating the former’s more complex pore architectures, rougher pore surfaces, and greater potential for gas adsorption; (3) for Types I and III, fractal dimensions exhibit positive correlations with organic matter content, pore structural parameters, and gas content, suggesting their effectiveness as indicators of reservoir quality. In contrast, in Types II and IV, the D₂ dimension is positively correlated with gas content, implying that mesopores play a significant role in gas occurrence, even in tectonically modified settings. These results highlight the utility of fractal analysis as a robust method for evaluating reservoirs in structurally complex geological environments.

盆地边缘富有机质页岩多重分形特征对认识储层非均质性、储气机理、寻找有利勘探目标具有重要意义。采用x射线衍射、低压氮气吸附、场发射扫描电镜等分析方法，结合Frenkel-Halsey-Hill分形模型，对中国国家页岩气勘探示范区昭通地区海相页岩孔隙结构进行了系统研究。结果表明：①识别出泥质/硅质混合页岩岩相（ⅰ型：M-2型）、碳酸盐/硅质混合页岩岩相（ⅱ型：M和M-1型）、富泥质硅质页岩岩相（ⅲ型：S-3型）和富碳酸盐/泥质硅质页岩岩相（ⅳ型：S-1和S-2型）4种不同类型的页岩岩相；(2)分形维数（D1、D2、D3）普遍高于分形维数（ⅰ、ⅲ），表明ⅱ型和ⅳ型孔隙结构更复杂，孔隙表面更粗糙，气体吸附潜力更大；(3)ⅰ、ⅲ类分形维数与有机质含量、孔隙结构参数、含气量呈正相关，表明分形维数作为储层质量指标的有效性。相反，在II型和IV型中，D2维数与含气量呈正相关，表明中孔在天然气赋存中起着重要作用，即使在构造改造的环境中也是如此。这些结果突出了分形分析作为一种有效的方法来评价构造复杂地质环境下的储层。

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引用次数: 0

Limit analysis of extended-reach drilling considering the coupling effects of hydraulic energy loss and transient cuttings transport 考虑水力能量损失与瞬态岩屑运移耦合效应的大位移钻井极限分析

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-12-01 DOI: 10.1016/j.ngib.2025.11.006

Jun Zhao , Wenjun Huang , Deli Gao , Weiguo Zhang , Chenghui Deng , Kun Zuo

Ultradeep extended-reach drilling has become the most effective engineering method for economically developing marginal reservoirs in the eastern South China Sea. However, complications, including poor hole cleaning, high pressure loss, and high pump pressure, pose serious threats to the safe and efficient drilling of large-hole sections (i.e., 17¹/₂-in. and 12¹/₄-in. section) with steep inclinations, constraining hydraulic extension limits. In this article, we present a hydraulic extension limit model for extended-reach wells, mainly considering the constraints of rated pump pressure, the safety density window of a formation, cuttings transport, and so on. The key to calculating the hydraulic limit was to obtain the distributions of hydraulic pressure in relation to a cuttings bed throughout an entire wellbore. We then built a mechanical coupling model of annular pressure and transient cuttings transport to overcome the shortcomings of relatively independent calculations of annular pressure and cuttings distribution. A case study showed that variations in drilling parameters during drilling caused corresponding alterations in the cuttings bed distribution. This affected the bottom-hole ECD (Equivalent Circulating Density) and surface SPP (Standpipe Pressure), explaining significant fluctuations in the measurement data. The hydraulic extension limit relates closely to various drilling parameters. Based on the results of a sensitivity analysis, we optimized these drilling parameters. For a 12¹/₄-in. section, the recommended mud displacement was 70 L/s, the recommended ROP (Rate of Penetration) was 50 m/h, and the recommended mud density was 1100 kg/m³. Using these recommended operating parameters increased the hydraulic limit by about 2.19 km.

超深大位移钻井已成为南海东部边缘储层经济开发最有效的工程方法。然而，井眼清洗效果差、压力损失大、泵压力高等问题严重威胁到大井段（如171/2-in）的安全高效钻井。和121/4-in。段)具有陡峭的倾斜度，限制液压延伸极限。本文主要考虑了额定泵压力、地层安全密度窗口、岩屑运移等因素的约束，建立了大位移井水力延伸极限模型。计算水力极限的关键是获得整个井筒中与岩屑床相关的水力分布。为克服环空压力和岩屑分布相对独立计算的不足，建立了环空压力与瞬态岩屑运移的力学耦合模型。实例研究表明，钻井过程中钻井参数的变化会导致岩屑床分布发生相应的变化。这影响了井底当量循环密度（ECD）和地面立管压力（SPP），解释了测量数据的显著波动。水力延伸极限与各种钻井参数密切相关。根据灵敏度分析的结果，我们对这些钻井参数进行了优化。对于121/4英寸。段时，推荐泥浆排量为70 L/s，推荐ROP为50 m/h，推荐泥浆密度为1100 kg/m3。使用这些推荐的操作参数将水力极限提高了约2.19公里。

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引用次数: 0

Risk assessment and prevention measures for casing deformation in the geological–engineering integration of a block in Jiaoshiba shale gas field 焦石坝页岩气田某区块地工一体化套管变形风险评价及预防措施

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-10-01 DOI: 10.1016/j.ngib.2025.09.007

Yunhong Xie , Jian Liu , Li Wang , Zhonghui Li

Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin, China, and it severely limits the development benefits of shale gas in that block. Based on the spatiotemporal characteristics of block formation, fracture development, and casing deformation occurrence, this paper employs an integrated geological–engineering research approach to identify the primary mechanisms governing casing deformation within the block and proposes countermeasures to prevent such deformation. The present research indicates the following findings: (1) The block has undergone multiple phases of tectonic superposition, with fracture development serving as the geological factor causing casing deformation. (2) Fracturing activation constitutes the engineering factor causing casing deformation, with 4 mm of formation slip inducing deformation. (3) The fracture activation risk map shows that Class I and Class II fractures account for 73.36 % of the total recorded in the block. Within the most susceptible Class I risk zone, the critical activation pressure increment for fracturing operations ranges from 13.43 MPa to 13.99 MPa. Based on the distribution of casing failure risk zones identified in the fracture activation risk map, this paper proposes relevant technical countermeasures for preventing casing failure from three perspectives: shale gas well location deployment, drilling techniques, and fracturing techniques. These measures provide robust support for safeguarding the integrity of casing systems within the studied block.

四川盆地焦石坝页岩气田某区块普遍存在套管变形问题，严重制约了该区块页岩气的开发效益。基于块体形成、裂缝发育和套管变形发生的时空特征，采用综合地质工程研究方法，识别了控制块体内套管变形的主要机制，并提出了防止套管变形的对策。研究表明：(1)该区经历了多期构造叠加，裂缝发育是造成套管变形的地质因素。(2)压裂激活是引起套管变形的工程因素，4 mm地层滑移引起套管变形。(3)裂缝激活风险图显示，ⅰ类和ⅱ类裂缝占区块记录裂缝总数的73.36%。在最容易发生ⅰ类风险的区域，压裂作业的临界激活压力增量在13.43 MPa ~ 13.99 MPa之间。根据裂缝激活风险图中确定的套管失效风险区域分布，从页岩气井选址部署、钻井技术和压裂技术三个方面提出了防止套管失效的相关技术对策。这些措施为保护所研究区块内套管系统的完整性提供了强有力的支持。

{"title":"Risk assessment and prevention measures for casing deformation in the geological–engineering integration of a block in Jiaoshiba shale gas field","authors":"Yunhong Xie , Jian Liu , Li Wang , Zhonghui Li","doi":"10.1016/j.ngib.2025.09.007","DOIUrl":"10.1016/j.ngib.2025.09.007","url":null,"abstract":"<div><div>Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin, China, and it severely limits the development benefits of shale gas in that block. Based on the spatiotemporal characteristics of block formation, fracture development, and casing deformation occurrence, this paper employs an integrated geological–engineering research approach to identify the primary mechanisms governing casing deformation within the block and proposes countermeasures to prevent such deformation. The present research indicates the following findings: (1) The block has undergone multiple phases of tectonic superposition, with fracture development serving as the geological factor causing casing deformation. (2) Fracturing activation constitutes the engineering factor causing casing deformation, with 4 mm of formation slip inducing deformation. (3) The fracture activation risk map shows that Class I and Class II fractures account for 73.36 % of the total recorded in the block. Within the most susceptible Class I risk zone, the critical activation pressure increment for fracturing operations ranges from 13.43 MPa to 13.99 MPa. Based on the distribution of casing failure risk zones identified in the fracture activation risk map, this paper proposes relevant technical countermeasures for preventing casing failure from three perspectives: shale gas well location deployment, drilling techniques, and fracturing techniques. These measures provide robust support for safeguarding the integrity of casing systems within the studied block.</div></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"12 5","pages":"Pages 623-635"},"PeriodicalIF":6.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145398403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Global liquefied natural gas market development and future outlook 全球液化天然气市场发展及未来展望

IF 6.5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B

Pub Date : 2025-10-01 DOI: 10.1016/j.ngib.2025.10.001

Kai Wang, Sixing Zhao, Zhen Wang

Since 2020, the global energy market has faced persistent disruptions due to geological tensions and the economic competition among great nations, with liquefied natural gas (LNG) emerging as a vital instrument in balancing energy security and transition within the global carbon neutrality framework. This study reviewed the global LNG market from 2020 to 2024 through prices, trade flows, liquefaction capacity, shipping, and regasification infrastructure to provide medium- and long-term market outlooks in terms of supply, demand, trade, liquefaction capacity, and prices. The following research results were obtained: (1) The global LNG market underwent profound reconstruction between 2020 and 2024, with natural gas prices retreating sharply after a period of extreme volatility. (2) LNG trade flows were fundamentally reshaped by a pronounced shift toward Europe, disrupting the traditional Asia-centric landscape. (3) Liquefaction capacity growth decelerated, with the United States surpassing Australia to become the world's largest market in terms of liquefaction capacity. (4) Global natural gas production is poised for steady growth, while demand retains substantial potential, driven by both economic expansion and energy transition. (5) A forthcoming wave of liquefaction projects is expected to create a less restricted supply-demand market balance, which would likely lead to diverging price paths and narrower spreads between major hubs. The LNG industry faces promising opportunities from energy transition and digitalization, particularly for floating storage regasification units and small-scale LNG, while confronting major challenges, including persistent geopolitical tensions, shipping route uncertainties, and increasing dependence on the pace of renewable energy deployment.

自2020年以来，由于地质紧张局势和大国之间的经济竞争，全球能源市场面临持续中断，液化天然气（LNG）正在成为平衡能源安全和全球碳中和框架内转型的重要工具。本研究从价格、贸易流量、液化能力、航运和再气化基础设施等方面回顾了2020年至2024年的全球液化天然气市场，从供应、需求、贸易、液化能力和价格等方面提供了中长期市场前景。研究结果如下：(1)全球LNG市场在2020 - 2024年间经历了深刻重构，天然气价格在经历一段极端波动期后大幅回落。(2) LNG贸易流向因向欧洲的明显转移而从根本上重塑，打破了传统的以亚洲为中心的格局。(3)液化能力增长放缓，美国超过澳大利亚成为全球最大的液化能力市场。(4)在经济扩张和能源转型的双重驱动下，全球天然气产量将保持稳定增长，而需求仍保持巨大潜力。(5)即将到来的一波液化项目预计将创造一个限制较少的供需市场平衡，这可能会导致不同的价格路径和主要枢纽之间的价差缩小。LNG行业面临着能源转型和数字化带来的充满希望的机遇，特别是浮式储存再气化装置和小型LNG，同时也面临着重大挑战，包括持续的地缘政治紧张局势、航运路线的不确定性以及对可再生能源部署速度的日益依赖。

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引用次数: 0