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Integrity and Failure Analysis of Cement Sheath Subjected to Coalbed Methane Fracturing

Fluid Dynamics & Materials Processing 2023年第2期19卷 329-344页

作者： Lingyun Zhao Heng Yang Yuanlong Wei Yuhuan Bu Shaorui Jing Peiming Zhou Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural ResourcesGuiyang550081China Guizhou Engineering Research Institute of Oil&Gas Exploration and Development Guiyang550081China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Shandong Key Laboratory of Oilfield Chemistry Key Laboratory of Unconventional Oil&Gas DevelopmentChina University of Petroleum(East China)Qingdao266580China

Perforation and fracturing are typically associated with the development of coalbed methane *** the cement sheath is prone to failure during this process,in this work,the effects of the casing pressure,elastic modulus of the cement,elastic modulus of the formation,and casing eccentricity on the resulting stresses are analyzed in the frame of a finite element ***,sensitivity response curves of the cement sheath stress are plotted by normalizing all *** results show that the maximum circumferential stress and Mises stress of the cement sheath increase with the casing internal pressure,elastic modulus of the cement and casing *** the elastic modulus of the formation increases,the maximum circumferential stress of the cement sheath decreases,and its maximum Mises stress increases *** cement sheath undergoes tensile failure during coalbed methane *** stress sensitivity of the cement sheath to the influential parameters is in the following order:casing internal pressure>elastic modulus of cement sheath>casing eccentricity>elastic modulus of formation.

关键词： Coalbed methane fracturing finite element method cement sheath integrity sensitivity analysis failure analysis

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An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

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Fluid Dynamics & Materials Processing 2023年第5期19卷 1215-1226页

作者： Leiju Tian Yuhuan Bu Huajie Liu Lingyun Zhao School of Petroleum Engineering China University of Petroleum(East China)Qingdao266555China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural ResourcesGuiyang550000China Guizhou Engineering Research Institute of Oil&Gas Exploration and Development Guiyang550000China

The mechanical properties of Portland cement differ from the weakly consolidated shallow formation in deep *** results in undesired abrupt changes in the compressive strength and elastic modulus at the cement–formation *** this study,a water-borne epoxy resin was applied as a strengthening material to reinforce the weakly consolidated shallow formation and protect the cement sheath from potential *** mechanical properties of the unconsolidated clay were tested,including their changes with increases in the temperature and curing *** addition,the effects of the seawater,cement slurry alkaline filtrate,and saltwater drilling fluid were *** confirmed by the results,the strengthening fluid was excellent at reinforcing the unconsolidated clay,with a compressive strength of 2.49 MPa(after curing for 7 days),even at a dosage of 5%.A cement slurry filtrate with a high pH was suitable to produce the required strengthening of the formation,especially its early age *** should also be pointed out that the used fluid exhibited good compatibility with the saltwater drilling fluid and seawater behaved well as a diluent for the strengthening fluid.

关键词： Manuscript compressive strength deepwater oil and gas well well cementing epoxy resin weakly consolidated shallow formation

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Anti-permeability Technology of Cross-layer High Pressure Hydraulic Fracturing in Soft Coal Seam 8th

Anti-permeability Technology of Cross-layer High Pressure Hy...

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8th International Conference on Advances in Energy Resources and Environment Engineering, ICAESEE 2022

作者： Ren, Haiying Pan, Chao Zhou, Peiming Fu, Yinlan Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guizhou Guiyang550001 China Guizhou Engineering Research Institute of Oil and Gas Exploration and Development Guizhou Guiyang550001 China Mining College Guizhou University Guizhou Guiyang550025 China

ISBN: (纸本)9783031425622

To solve the low permeability of soft coal seams gas management existence question, 2124-3 a mine in Liupanshui coal face as the background, puts forward the use of secondary grouting hole sealing auxiliary hydraulic fracturing anti-reflection layer of high voltage technology, was studied by numerical simulation and field test under the action of high-pressure hydraulic fracturing fracture field dynamic evolution rule and unloading anti-reflection effect. The results show that the fatigue failure of the coal body can be caused by high-pressure hydraulic fracturing, so as to dredge pores and improve gas permeability. The effective anti-reflection radius is up to 30 m, which significantly improves the extraction concentration and flow rate of the drilling hole, shortens the extraction time to reach the standard, reduces the dynamic phenomena such as the index exceeding the standard and the spray hole in the anti-penetration construction, and reduces the gas concentration and the number of gas overrun in the tunneling process. This technology can effectively increase the influence range of a single hole, improve extraction efficiency, and has a wide application prospect. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Unloading

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Influence of Water Content and Lateral Pressure on Coal-Rock Wellbore Stability Under Biaxial Compression

SSRN

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SSRN 2024年

作者： Liu, Xudong Liu, Wei Wei, Yuanlong Zhang, Xiong Zhao, Fuping Zhao, Lingyun Fu, Yinlan Jiang, Deyi Li, Jianghao Li, Depeng State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China Guizhou Oil and Gas Exploration and Development Engineering Research Institute Guiyang550081 China Key Laboratory of Unconventional Gas Evaluation and Development in Complex Structural Areas Guiyang550081 China

It is of great significance to analyze the failure form and crack expansion patterns around the coal-rock cavity for exploring the mechanism of wellbore instability in barefoot interval of multi-branch horizontal well. In order to better study the effects of water content and lateral pressure on the wellbore stability of barefoot interval of multi-branch horizontal wells, based on acoustic emission (AE) and digital image correlation (DIC) technologies, a series of biaxial compression tests of coal-rock with hole under different water content and lateral pressure were carried out for in Bijie experimental region of Guizhou Province. Furthermore, the failure modes and crack expansion patterns around coal-rock wellbore with different water content and lateral pressure were compared and analyzed. The results show that: (1) Water has a certain influence on the mechanical properties of coal-rock in the Bijie Experimental Region. The peak strength and peak strain both decrease with the increase of water content, and the elastic modulus is relatively little affected by water content. (2) The failure characteristics of coal-rock with different water content under biaxial compression test presents the composite failure modes of tension-shear, and is dominated by tensile failure. (3) The peak strength and peak strain of coal-rock increase in a power function form with the increase of (Symbol Presented)2, and the elastic modulus also increases slightly with the increase of (Symbol Presented)2. (4) Under different (Symbol Presented)2 conditions, the initial failure of coal samples mostly starts from the coal-rock wellbore and the vicinity of primary fractures. As the biaxial stress difference decreases, the self-stabilization time of coal samples increases. (5) The selection of wells ((Symbol Presented)1-(Symbol Presented)2) and the selection of wells with small Cov can effectively increase the stability performance of barefoot interval of coal reservoirs and reduce the risk of

关键词： Ductile fracture

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Effects of creep of the salt rock formation on the failure of cement sheath integrity

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Procedia structural Integrity 2024年 58卷 144-149页

作者： Heng Yang Yuhuan Bu ShaoRui Jing Lingyun Zhao Shenglai Guo Huajie Liu Key Laboratory of Unconventional Oil & Gas Development China University of Petroleum (East China) Qingdao 266580 P. R. China School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 P. R. China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guiyang 550081 P. R. China Guizhou Engineering Research Institute of Oil&Gas Exploration and Development Guiyang 550081 P. R. China

Salt rock has a good sealing ability for oil and gas, but the creep of salt rock may cause wellbore integrity failure, and even cause safety accidents and economic losses in serious cases. Based on the creep law of salt rock obtained from the creep experiment of salt rock, the finite element model of casing-cement sheath-formation combination in salt rock formation is established. The effect of formation creep on the integrity of cement sheath under different uniform in-situ stress conditions is studied. The results show that the creep of salt rock will cause the shear failure of the cement sheath; reducing the elastic modulus of the cement sheath and increasing the Poisson's ratio of cement sheath will reduce the risk of shear failure of the cement sheath.

关键词： Creep of the salt rock formation finite element method failure of cement sheath integrity in-situ stress

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A Method for Automatic Identification of Natural Fracture Based on Machine Learning: A Case Study on the Dahebian Block of the Liupanshui Basin in Guizhou Province 13th

A Method for Automatic Identification of Natural Fracture Ba...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Zhao, Wei-Guang Sang, Shu-Xun Cheng, De-Qiang Han, Si-Jie Zhou, Xiao-Zhi Zhang, Jin-Chao Zhao, Fu-Ping School of Resources and Geosciences China University of Mining and Technology Xuzhou221116 China Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Controland Utilization China University of Mining and Technology Xuzhou221008 China Carbon Neutrality Institute China University of Mining and Technology Xuzhou221008 China Artificial Intelligence Research Institute China University of Mining and Technology Xuzhou221116 China School of Information and Control Engineering China University of Mining and Technology Xuzhou221116 China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Xuzhou221116 China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guiyang550009 China Guizhou Engineering Research Institute of Oil & Gas Exploration and Development Guiyang550009 China

ISBN: (纸本)9789819702718

Natural fractures are effective storage spaces and important seepage channels for oil and gas reservoirs. Accurately identifying natural fractures in reservoirs is crucial for the exploration and development of oil and gas resources. This article combines conventional and imaging logging data and uses machine learning to automatically identify natural fractures in reservoirs. The fracture labels of conventional logging come from imaging logging. Conventional logging data is decomposed through multi-scale wavelet to extract components that reflect fracture information, and further build the original data set. The AdaBoost model is trained based on a modified dataset of balanced samples for automatic fractures recognition in logging. The research results indicate that the approximate component and high-frequency component reflect the fluctuation of the formation and noise information respectively, and have little impact on the reservoir fractures identification;The medium frequency component can reflect the characteristic information of fractures and can be used for model training;After hyper-parameter optimization, the AdaBoost model has high accuracy and generalization ability, and can still accurately identify the types and distribution of natural fractures from the actual unbalanced logging data. This research has important guiding significance for the accurate characterization and construction of reservoir. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Wavelet transforms

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Hydrothermal carbonization of woody waste: Changes in the physicochemical properties and the structural evolution mechanisms of hydrochar during this process

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Chemosphere 2024年 366卷 143524页

作者： Yang, Cong Xia, Peng Zhao, Lingyun Wang, Ke Wang, Bing Huang, Rui Yang, Huan Yao, Yuanzhu College of Resources and Environmental Engineering Guizhou University Guiyang550025 China Key Laboratory of Karst Georesources and Environment Ministry of Education Guizhou University Guiyang550025 China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guiyang550081 China Guizhou Academy of Petroleum Exploration and Development Engineering Guiyang550081 China College of Electrical Engineering Guizhou University Guiyang550025 China

The Chinese medicine residue (CMR) is composed of wet woody waste, including licorice and ephedra, so using hydrothermal carbonization (HTC) to recover renewable energy from the CMR is a suitable treatment method. An in-depth analysis of the physicochemical properties and structural evolution mechanism of hydrochars is helpful in fundamentally promoting the energy utilization of traditional Chinese medicine waste residue. Therefore, this study analyzed the physicochemical properties and morphological structure of hydrochar produced under varying HTC conditions using multiple testing methods. The evolution of the hydrochar's structural characteristics can be categorized into three stages: component decomposition, structural rearrangement, and carbonization. During the component decomposition and carbonization stages, numerous nanoscale micropores form within the hydrochar. These micropores' specific surface area and pore volume can reach up to 113.420 m2/g and 0.01913 cm3/g, respectively. The highest fractal dimension values for D1 and D2 are 2.6354 and 2.5565, while the maximum values for the microcrystalline stacking height (Lc) and the average number of crystalline layers (Nave) are 0.3354 and 1.9968, respectively. Consequently, the hydrochar produced during these stages exhibits a rougher pore surface and a more complex structure, making it more suitable for adsorbing heavy metals from soil and sequestering CO2. During the structural rearrangement stage, the hydrochar exhibits higher contents of fixed carbon (FC), MgO, P2O5, and a higher C/N atomic ratio, with maximum values of 38.51%, 0.99%, 1.12%, and 28.49, respectively. Thus, the hydrochar produced during this stage is more suitable for soil remediation and nutrient recovery. © 2024 Elsevier Ltd

关键词： Micropores

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Characteristics and formation mechanism of siltstone-mudstone rhythmic sedimentary sections in the Lower Silurian Longmaxi Formation in the Changning area,South Sichuan Basin,southwest China

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Frontiers of Earth Science 2021年第4期15卷 754-769页

作者： Gaoxiang WANG Lei CHEN Yang YANG Cui JING Man CHEN Xiucheng TAN Xin CHEN Di CAO Zibo WEI Minglong LI Dong HUANG School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China PetroChina Southwest Oil&Gasfield Company Chengdu 610051China Sichuan Changning Natural Gas Development Co.Ltd Chengdu 610051China Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province Chengdu 610091China Technology Innovation Center of Shale Gas Exploration and Development in Complex Structural Areas(Ministry of Natural Resources) Chengdu 610091China Sichuan Keyuan Testing Center of Engineering Technology Chengdu 610091China

The Lower Member of the Longrnaxi Forma-tion is generally dominated by siliceous shale,but recently we found some siltstone-mudstone rhythm sections developed in the Lower Member of the Longmaxi *** study of formation mechanism of siltstone-mudstone rhythmic sedimentary sections may provide new insights into the shale sedimentary ***,we studied the characteristics and formation mechanism of siltstone-mudstone rhythmic sedimentary sections in the Lower Member of the Long-maxi Formation in the Changning area based on core observation,thin section identification,major elements and trace elements *** results show the following:1)Two siltstone-mudstone rhythmic sedimentary sections are characterized by frequent interbed between black or gray-black shale and light gray siltstone,abundant argillaceous laminas and silty laminas,with obvious lithological boundaries having *** laminas and rhythmic laminas are well-developed in the shale layer,while the wavy laminas are well-developed in the siltstone layer.2)The major compositional elements are SiO2,Al2O3 and CaO,followed by Fe_(2)O_(3),MgO,K_(2)O and Na_(2)O.3)Compared with the world average shale,these siltstone-mudstone rhythmic sedimentary sections are rich in Mo,U and Ba,but less in V,Co,Ni,*** with the shale layer,the siltstone layer has lower contents of V,Co and Ni.4).The geochemical redox indices,Mo-U and CIA values suggest the formation of the siltstone-mudstone rhythmic sedimentary sections are related to influences from bottom currents in an oxic condition with a warm and humid paleoclimate.

关键词： shale Longmaxi Formation bottom current deposit Sichuan Basin

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Origin of Calcite Cements in the Permian Lucaogou Formation Tight Reservoirs, Jimsar Sag, Junggar Basin, Nw China: Constraints from Geochemistry

SSRN

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SSRN 2023年

作者： Fan, Qingqing Liu, Dadong Xu, Mingyang Zhao, Shuai Tang, Zijun Xiao, Dianshi Li, Yingyan Deng, Yuan Du, Wei Zhang, Ziya National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum Beijing102249 China Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guiyang550004 China Qingdao266580 China Research Institute of Petroleum Exploration and Development Xinjiang Oilfield Company PetroChina Xinjiang Karamay834000 China

Understanding the diagenetic evolution of carbonate cementation in hydrocarbon reservoirs is critical to better reconstruct the history of fluid flow during petroleum accumulation. The extensive occurrence of carbonate cements within the lower Permian Lucaogou Formation tight reservoirs is regarded as a major diagenetic factor that causes strong hydrocarbon reservoir heterogeneities. Petrographic and geochemical analyses, including optical microscopy fitted with cathodoluminescence and fluorescence, scanning electron microscopy, carbon and oxygen stable isotopes, in situ rare earth element, as well as fluid inclusion microthermometry, were carried out to decipher the origin of carbonate cementation and understand its control on reservoirs quality. Petrography shows that the precipitating cements mostly consist of pore-filling blocky/mosaic calcite, with a dull orange luminescence color. Chondrite-normalized rare earth element (REE) patterns and C-O isotopic compositions of these calcite cements exhibit strongly negative Eu and Tb anomalies, enrichment in light REE, positive carbon (δ13CPDB = 0.58‰-7.45‰) and negative oxygen (δ18OPDB = -11.38‰ to -8.61‰) isotopic values, similar to the dolostone and micritized peloidal grains, suggesting that the calcite-precipitating fluids were derived from dissolution of lacustrine depositional carbonates. The relative timing of calcite precipitation in reservoirs was estimated based on the thermal-burial history of the study region and precipitation temperatures obtained from fluid inclusions. The results show that this cementation episode mainly occurred during the Late Triassic to Early Jurassic, which was synchronous with the uplift event. Moreover, the homogenization temperatures of fluid inclusions and geochemical signatures of the calcite cement are similar to those of the inclined fracture-filling calcite within reservoirs, suggesting that these two calcite phases may be genetically related and form coevally within one flu

关键词： Calcite

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Coal Forming Environment and Provenance Evolution During the Late Permian in the Western Guizhou: Evidence from the Coal Petrography and Geochemistry of Longtan Coal in Well Dh-1

SSRN

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SSRN 2024年

作者： Xiang, Wenxin Han, Sijie Sang, Shuxun Mondal, Debashish Zhou, Xiaozhi Zhao, Fuping Wu, Zhangli Zhang, Jinchao Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Jiangsu Xuzhou221008 China School of Resources and Geosciences China University of Mining and Technology Jiangsu Xuzhou221116 China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and Technology Xuzhou221008 China Carbon Neutrality Institute China University of Mining and Technology Xuzhou221008 China Guizhou Engineering Research Institute of Oil & Gas Exploration and Development Guiyang550081 China Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas Ministry of Natural Resources Guiyang550081 China

The geochemical signatures of trace elements in coal are critical indicators of the material sources and depositional environments during the coal-forming period. This study investigates 13 coal seams from the Longtan Formation within the Dahebian syncline, Guizhou, China. It encompasses industrial analysis, sulfur measurement, elemental profiling, coal ash composition analysis, maceral identification, and trace element quantification. The research investigates the coal samples' petrological, mineralogical, sedimentological, and geochemical characteristics to assess the vertical evolution of the coal-forming environment and provenance variations within the Longtan Formation, explores the relationship between changes in the depositional environment and material sources, and constructs a sedimentary infilling model for the Late Permian in western Guizhou. The key findings of the research are as follows: (1)The upper coal samples are characterized by high sulfur content and abundant pyrite, with silicon enrichment, aluminum depletion, and high rare earth element enrichment coefficients. The bottom coal samples show significant enrichment in the high-field-strength elements Zr, Nb, Hf, and Ta.(2)The detrital materials in the coal samples are likely derived from three sources: high-Ti/low-Ti basalts from the Emeishan region, felsic rocks from the summit of Emeishan, and volcanic ash from the Permian-Triassic Boundary (PTB). (3)The overall depositional environment of the Longtan Formation is predominantly humid and reductive, and the coal-forming plants are mainly aquatic and herbaceous. However, the upper segment exhibits a more stable depositional environment than the lower segment, with a trend towards arid and oxidative conditions in the later depositional stages. (4)The instability in the depositional environment of the lower segment of the Longtan Formation may be linked to magmatic dike eruptions and volcanic ash fallout from the Emeishan region. The trend towards

关键词： Coal

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