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Effect of hydraulic fracture deformation hysteresis on CO_(2)huff-n-puff performance in shale gas reservoirs

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第1期24卷 37-55页

作者： Xia YAN Pi-yang LIU Zhao-qin HUANG Hai SUN Kai ZHANG Jun-feng WANG Jun YAO School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Civil Engineering School Qingdao University of TechnologyQingdao 266520China Chuandong drilling Company CNPC Chuanqing Drilling Engineering Company LimitedChongqing 401120China

As a promising enhanced gas recovery technique,CO_(2)huff-n-puff has attracted great attention ***,hydraulic fracture deformation hysteresis is rarely considered,and its effect on CO_(2)huff-n-puff performance is not well *** this study,we present a fully coupled multi-component flow and geomechanics model for simulating CO_(2)huff-n-puff in shale gas reservoirs considering hydraulic fracture deformation ***,a shale gas reservoir after hydraulic fracturing is modeled using an efficient hybrid model incorporating an embedded discrete fracture model(EDFM),multiple porosity model,and single porosity *** flow equations,Fick’s law,extended Langmuir isotherms,and the Peng-Robinson equation of state are used to describe the molecular diffusion,multi-component adsorption,and gas properties,*** relation to geomechanics,a path-dependent constitutive law is applied for the hydraulic fracture deformation *** finite volume method(FVM)and the stabilized extended finite element method(XFEM)are applied to discretize the flow and geomechanics equations,*** then solve the coupled model using the fixed-stress split iterative ***,we verify the presented method using several numerical examples,and apply it to investigate the effect of hydraulic fracture deformation hysteresis on CO_(2)huff-n-puff performance in a 3D shale gas *** results show that hydraulic fracture deformation hysteresis has some negative effects on CO_(2)huff-n-puff *** effects are sensitive to the initial conductivity of hydraulic fracture,production pressure,starting time of huff-n-puff,injection pressure,and huff-n-puff cycle number.

关键词： Enhanced gas recovery CO_(2)huff-n-puff Coupled geomechanics and multi-component flow Hydraulic fracture deformation hysteresis Embedded discrete fracture model(EDFM)

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Inter-layer interference for multi-layered tight gas reservoir in the absence and presence of movable water

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Petroleum Science 2024年第3期21卷 1751-1764页

作者： Tao Zhang Bin-Rui Wang Yu-Long Zhao Lie-Hui Zhang Xiang-Yang Qiao Lei Zhang Jing-Jing Guo Hung Vo Thanh National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu60500SichuanChina Shaanxi Yanchang Petroleum(Group)Corp.Ltd. Xian710075ShaanxiChina Waseda research institute for Science and Engineering Waseda UniversityTokyoJapan

Due to the dissimilarity among different producing layers,the influences of inter-layer interference on the production performance of a multi-layer gas reservoir are ***,systematic studies of inter-layer interference for tight gas reservoirs are really limited,especially for those reservoirs in the presence of *** this work,five types of possible inter-layer interferences,including both absence and presence of water,are identified for commingled production of tight gas ***,a series of reservoir-scale and pore-scale numerical simulations are conducted to quantify the degree of influence of each type of *** field evidence from the Yan'an tight gas reservoir(Ordos Basin,China)is found to support the simulation ***,suggestions are proposed to mitigate the potential inter-layer *** results indicate that,in the absence of water,commingled production is favorable in two situations:when there is a difference in physical properties and when there is a difference in the pressure system of each *** reservoirs with a multi-pressure system,the backflow phenomenon,which significantly influences the production performance,only occurs under extreme conditions(such as very low production rates or well shut-in periods).When water is introduced into the multi-layer system,inter-layer interference becomes nearly *** both the gas-rich layer and water-rich layer for commingled production is not desirable,as it can trigger water invasion from the water-rich layer into the gas-rich *** gas-rich layer might also be interfered with by water from the neighboring unperforated water-rich layer,where the water might break the barrier(eg weak joint surface,cement in fractures)between the two layers and migrate into the gas-rich ***,the gas-rich layer could possibly be interfered with by water that accumulates at the bottom of the wellbore due to gravitational diff

关键词： Tight gas Comingled production Interference Two-phase flow Water blocking

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Dynamic Analysis of A Deepwater drilling Riser with A New Hang-off System

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China Ocean Engineering 2024年第1期38卷 29-41页

作者： LI Yan-wei LIU Xiu-quan WANG Jin-long CHEN Guo-ming CHANG Yuan-jiang SHENG Lei-xiang Centre for Offshore Engineering and Safety Technology China University of PetroleumQingdao 266580China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumQingdao 266580China China CNOOC research institute Co. Ltd.Beijing 100028China

The safety of risers in hang-off states is a vital challenge in offshore oil and gas engineering.A new hang-off system installed on top of risers is proposed for improving the security of *** approach leads to a challenging problem:coupling the dynamics of risers with a new hang-off system combined with multiple structures and complex *** accurately analyze the dynamic responses of the coupled system,a coupled dynamic model is established based on the Euler-Bernoulli beam-column theory and penalty function method.A comprehensive analysis method is proposed for coupled dynamic analysis by combining the finite element method and the Newmarkβ*** analysis program is also developed in MATLAB for dynamic *** simulation results show that the dynamic performances of the risers at the top part are significantly improved by the new hang-off system,especially the novel design,which includes the centralizer and articulation *** bending moment and lateral deformation of the risers at the top part decrease,while the hang-off joint experiences a great bending moment at the bottom of the lateral restraint area which requires particular attention in design and *** platform navigation speed range under the safety limits of risers expands with the new hang-off system in use.

关键词： deepwater drilling riser new hang-off system dynamic analysis finite element method penalty function method

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drilling-based measuring method for the c-φ parameter of rock and its field application

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International Journal of Mining Science and Technology 2024年第1期34卷 65-76页

作者： Bei Jiang Fenglin Ma Qi Wang Hongke Gao Dahu Zhai Yusong Deng Chuanjie Xu Liangdi Yao State Key Laboratory for Tunnel Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China

The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ. In this paper, a new rock cutting analysis model that considers the influence of the rock crushing zone(RCZ) is built. The formula for an ultimate cutting force is established based on the limit equilibrium principle. The relationship between digital drilling parameters(DDP) and the c-φ parameter(DDP-cφ formula, where c refers to the cohesion and φ refers to the internal friction angle) is derived, and the response of drilling parameters and cutting ratio to the strength parameters is analyzed. The drillingbased measuring method for the c-φ parameter of rock is constructed. The laboratory verification test is then completed, and the difference in results between the drilling test and the compression test is less than 6%. On this basis, in-situ rock drilling tests in a traffic tunnel and a coal mine roadway are carried out, and the strength parameters of the surrounding rock are effectively tested. The average difference ratio of the results is less than 11%, which verifies the effectiveness of the proposed method for obtaining the strength parameters based on digital drilling. This study provides methodological support for field testing of rock strength parameters.

关键词： Digital drilling Rock crushing zone c-u parameter Measurement method Field application

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Actual wellbore tortuosity evaluation using a new quasi-three-dimensional approach

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Petroleum 2022年第1期8卷 118-127页

作者： Jun Jing Wenyong Ye Cong Cao Xiaomin Ran School of Mechatronic Engineering Southwest Petroleum UniversityChengduChina cnpc Chuanqing drilling Engineering Company Limited Xi’anChina National Engineering Laboratory for Low-permeability Oil&Gasfield Exploration and Development Xi’anChina cnpc BOHAI drilling Engineering Company Limited TianjinChina Sichuan Vocational College of International Technology GuangyuanChina

The irregular wellbore trajectory caused by the wellbore deviation and fluctuation makes a significant effect on the torque and drag in extending and direction drilling,especially for wellbore trajectory with obvious deviation in the drilling *** a consequence,a new quasi-three-dimensional wellbore tortuosity evaluation method is *** new method incorporates the effect of fluctuation frequency and amplitude of oscillating wellbore trajectory;a weight coefficient index that quantifies the effect of tortuosity of one segment trajectory to the entire trajectory;a‘Peak-Valley’principle that can decompose the irregular wellbore trajectory in various scale *** studies show that the deflection angle between the segments of tortuous wellbore increases the torque and drag by strengthening the contact behaviors between the drillstring and ***,the deflection angle is introduced to quantify the effect of deviation in the drilling direction on wellbore *** evaluation results of two field cases demonstrate the new method which is adapted to the wellbore trajectory fluctuating with various characteristics and can reflect the actual state of wellbore tortuosity with severe oscillation more effectively and accurately.

关键词： Wellbore trajectory Deflection angle Peak-valley principle Evaluation method

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Petroleum geological features and hydrocarbon enrichment of Linhe Depression in Hetao Basin, NW China

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石油勘探与开发:英文版 2023年第4期50卷 798-811页

作者： ZHANG Ruifeng HE Haiqing ZHU Qingzhong CHEN Shuguang LIU Xiheng DAN Weining HU Yanxu SHI Yulei ZHANG Yufei YU Haijun ZHANG Ximeng PetroChina Huabei Oilfield Company Renqiu 062552China PetroChina Oil&Gas and New Energy Company Beijing 100007China Logging Technology research institute of cnpc Logging Company Beijing 100007China No.2 Mud Logging Company CNPC Bohai Drilling Engineering Company LimitedRenqiu 062552China

Based on paleogeomorphology, drilling and seismic data, this paper systematically studies the structural and sedimentary evolution, source rock characteristics, reservoir characteristics and formation mechanism, hydrocarbon accumulation model and enrichment law in the Linhe Depression of the Hetao Basin, NW China. The Hetao Basin mainly experienced three stages of evolution, namely, weak extensional fault depression, strong extensional fault depression and strike-slip transformation, giving rise to four positive structural belts(Jilantai, Shabu, Nalinhu and Xinglong), which are favorable areas for oil and gas accumulation. The two main saline lacustrine source rocks, Lower Cretaceous Guyang Formation and Oligocene Linhe Formation, are characterized by high sulfur content, rich algae, early maturity, early expulsion, and wide oil generation window. The large structural transition belt in the intermountain area around the Hetao Basin controls the formation of large-scale braided river delta deposits, which are characterized by high quartz content(50%-76%), long-term shallow burial and weak compaction, low cement content, and good reservoir properties in delta front sandbody. The burial depth of the effective Paleogene reservoirs is predicted to reach 8000 m. Three hydrocarbon accumulation models, nose-uplift near sag, buried hill surrounding sag, fault nose near source rock, are constructed. The law of hydrocarbon accumulation in the Linhe Depression is finally clarified as follows: near-source around the depression is the foundation, high-quality thick reservoir is the premise, good tectonic setting and trap conditions are the key.

关键词： Hetao Basin Linhe Depression Cretaceous Guyang Formation Paleogene Linhe Formation Jilantai Oilfield Bayan Oilfield hydrocarbon enrichment law

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Experimental Evaluation of the Mechanical Properties of Cement Sheath under High-Temperature Conditions

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Fluid Dynamics & Materials Processing 2022年第3期18卷 689-699页

作者： Pei Zou Zhiqiang Huang Yian Tong Leichuan Tan Rui Li Kai Wei Deng Qiao Yangtze University Wuhan430199China Downhole Service Company CNPC Chuanqing Drilling Engineering Co.Ltd.Chengdu610052China Chuanxi drilling Company CNPC Chuanqing Drilling Engineering Co.Ltd.Chengdu610051China China National Logging Corporation Southwest Branch Chongqing401147China China University of Geosciences Wuhan430074China

The sealing integrity of cement sheath in offshore wells is seriously threatened under high-temperature conditions,resulting in gas channeling and other *** the lack of experimental results,in this study relevant samples of a cement slurry sealing section of a typical offshore high-temperature well have been prepared and *** particular,the mechanical properties have been assessed with a triaxial pressure servo instrument and a high-temperature curing *** density and the Poisson’s ratio of the samples have also been *** stress-strain curve has been drawn to obtain the elastic modulus and the compressive *** rock brittleness index has been calculated according to the measured elastic modulus and the Poisson’s ratio,together with the brittleness and the compressibility of the cement *** test results show that the mechanical properties and bonding strength of the cement samples are optimal at 130°C,medium at 150°C,and poor at 180°C.

关键词： High-temperature wells cement sheath mechanical properties triaxial test brittleness index

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Method and Description of Sedimentary System Characterization Based on Sequence Stratigraphy

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Journal of Geoscience and Environment Protection 2024年第5期12卷 60-68页

作者： Jianmin Zhang Hui Cai Honglin Yue Pengfei Mu Bohai Oilfield research institute Tianjin Branch of CNOOC Ltd. Tianjin China

A Oilfield is the most representative mid to deep oil field in the Bohai Sea, with the main oil bearing intervals being the upper and middle Shahejie-3 sections of the Paleogene Shahejie Formation. By combining well seismic analysis, the middle section of Shahejie-3 is divided into high-level system tract and forced lake retreat system tract, corresponding to the II oil formation and I oil formation, respectively. Using sequence stratigraphy methods, based on seismic profiles and drilling lithological cycles, the high stand system tract is divided into 5 stages of delta progradation. The first and second stages are high angle S-type progradation with large sedimentary thickness, the third stage is oblique progradation, and the fourth and fifth stages are S-oblique composite progradation;By combining seismic data, we characterized the large-scale (8 small-scale) progradation bodies of 5 periods, clarified the distribution characteristics of reservoir planes, and laid the foundation for the later exploration of oilfield potential.

关键词： Middle Section of Shasan Sequence Stratigraphy Sedimentary System Characterization

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Investigation of Groundwater Quality with Borehole Depth in the Basin Granitoids of the Ashanti Region of Ghana

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Journal of Water Resource and Protection 2024年第5期16卷 381-394页

作者： Bernard Ofosu Augustine Kofi Asante Festus Anane Mensah Umar-Farouk Usman Naa Korkoi Ayeh Geotechnical and Materials Engineering Division CSIR-Building and Road Research Institute Kumasi Ghana

The dependence of groundwater quality on borehole depth is usually debatable in groundwater studies, especially in complex geological formations where aquifer characteristics vary spatially with depth. This study therefore seeks to investigate the relationship between borehole depth and groundwater quality across the granitoid aquifers within the Birimian Supergroup in the Ashanti Region. Physicochemical analysis records of groundwater quality data were collected from 23 boreholes of public and private institutions in the Ashanti Region of Ghana, and the parametric values of iron, fluoride, total hardness, pH, nitrate, and nitrite were used to study the groundwater quality-depth relationship. The results showed that the depth-to-groundwater quality indicated a marginal increase in water quality in the range of 30 to 50 m, which is mathematically represented by the low-value correlation coefficient (r2 = 0.026). A relatively significant increase occurs in the depth range of 50 to 80 m, which is given by a correlation coefficient of r2 = 0.298. The mean percent parameter compatibility was 74%, 82%, 89%, and 97% at 50, 60, 70, and 80 m depths, respectively. The variations in groundwater quality per depth ratio ranged from 1.48, 1.37, 1.27, and 1.21 for 50, 60, 70, and 80 m depth, respectively. The recommended minimum borehole depth for excellent groundwater quality is suggested with a compatibility per meter depth ratio of 1.37. This results in a range between 50 and 70 m as the most desirable drilling depth for excellent groundwater quality within the granitoids of the Birimian Supergroup of the Ashanti Region in Ghana.

关键词： Groundwater Quality Borehole Depth Birimian Supergroup Granitoid Aquifers Ashanti Region

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A Cementing Technology for Shale Oil Horizontal Wells

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Fluid Dynamics & Materials Processing 2023年第11期19卷 2837-2845页

作者： Yudong Tian Gonghui Liu Yue Qi Jun Li Yan Xi Wei Lian Xiaojie Bai Penglin Liu Xiaoguang Geng College of Petroleum Engineering China University of Petroleum-BeijingBeijing102249China cnpc drilling Engineering Technology research institute of Daqing drilling Engineering Company Daqing163413China College of Petroleum China University of Petroleum-Beijing at KaramayKaramay834000China College of Architectural Engineering Beijing University of TechnologyBeijing101124China

Organic rich dark shale of Q Formation can be found in many areas(e.g.,in the North of S Basin).The shale target stratum is easy to hydrate and often undergoes ***,centering the casing in the horizontal section of the irregular borehole is relatively ***,achieving a good cementflushing efficiency under complex borehole conditions is a complex *** technologies such as centralizer,efficient preflushing,multi-stageflushing and ductile cement slurry,better performances can be *** this study,it is shown that the cementing rate in the DY2H horizontal section is 97.8%,which is more than 34%higher than that of adjacent *** cementing matching technology for sidetracking horizontal wells can be used to improve the cementing quality of continental shale and provides a reference for future applications in thisfield.

关键词： Shale oil sidetracking horizontal well tough cement slurry cementing technology

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