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Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations

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Petroleum Science 2024年第5期21卷 3222-3236页

作者： Peng Tan Zhao-Wei Chen Liu-Ke Huang Qing Zhao Sha-Rui Shao CNPC engineering technology R&D Company Limited national engineering research center for oil&gas drilling and completion technology School of Civil engineering and Geomatics Southwest Petroleum University Shale gas research Institute Southwest Oil&Gas Field Company

Fracture geometry is important when stimulating low-permeability reservoirs for natural gas or oil production. The geological layer(GL) properties and contrasts in in-situ stress are the two most important parameters for determination of the vertical fracture growth extent and containment in layered rocks. However, the method for assessing the cumulative impact on growth in height remains ambiguous. In this research, a 3D model based on the cohesive zone method is used to simulate the evolution of hydraulic fracture(HF) height in layered reservoirs. The model incorporates fluid flow and elastic deformation, considering the friction between the contacting fracture surfaces and the interaction between fracture components. First, an analytical solution that was readily available was used to validate the model. Afterwards, a quantitative analysis was performed on the combined impacts of the layer interface strength, coefficient of interlayer stress difference, and coefficient of vertical stress *** results indicate that the observed fracture height geometries can be categorized into three distinct regions within the parametric space: blunted fracture, crossed fracture, and T-shaped ***, the results explained the formation mechanism of the low fracture height in the deep shale reservoir of the Sichuan Basin, China, as well as the distinction between fracture network patterns in mid-depth and deep shale reservoirs.

关键词： Deep shale Hydraulic fracturing HF propagation Fracture interaction Cohesive zone method

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Natural rubber latex as a potential additive for water-based drilling fluids

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Petroleum Science 2024年第4期21卷 2677-2687页

作者： Jun Yang Guan-Cheng Jiang Jing-Tian Yi Yin-Bo He Li-Li Yang Teng-Fei Dong Guo-Shuai Wang College of Petroleum engineering China University of Petroleum(Beijing)Beijing 102249China national engineering research center of oil&gas drilling and completion technology Beijing 102249China Changqing drilling General Company CNPC Chuanqing Drilling Engineering Company LimitedXi'an 710021ShaanxiChina

The environmental hazards and"carbon footprint"of oil and gas drilling can be significantly reduced by replacing traditional petroleum-based chemical additives with natural materials derived from plants and *** paper explored for the first time the interaction mechanism between natural rubber latex(NRL)and bentonite suspensions(BTs)through a series of characterization experiments,as well as the potential applications in water-based drilling fluids(WBDF).The gel viscoelasticity experiments showed that NRL could decrease the consistency coefficient(k)and flow index(n)of BTs,and enhance the shear thinning performance of BTs as pseudo-plastic *** addition,0.5 w/v%NRL not only increased the critical yield stress and strengthened the structural strength between the bentonite particles,but also facilitated the compatibility of pressure loss and flow *** evaluation of colloidal stability and WBDF performance indicated that NRL particles could promote the hydration and charge stability on the surface of BTs particles,and optimize the particle size distribution and flow resistance of WBDF under the"intercalation-exfoliation-encapsulation"synergistic ***,NRL can improve the rheological properties of WBDF at high temperatures(<150.C),and form a dense blocking layer by bridging and sealing the pores and cracks of the filter cake,which ultimately reduces the permeability of the cake and the filtration loss of WBDF.

关键词： Natural materials Water-based drilling fluids Natural rubber latex Bentonite suspensions Filtration loss

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Solid particle size characterization by a high-frequency collision response in pneumatic particulate flow

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Particuology 2024年第3期86卷 39-54页

作者： Kai Wang Yichen Li Ziang Chang Min Qin Guangming Fu Bangtang Yin Gang Wang jiaqi Tian School of Petroleum engineering China University of Petroleum(East China)Qingdao266580China Key Laboratory of Unconventional oil&gas Development China University of Petroleum(East China)Ministry of EducationQingdao266580China national engineering research center of oil&gas drilling and completion technology Qingdao266580China Shock and Vibration of engineering Materials and Structures Key Lab ofSichuan Province Southwest University of Science and TechnologyMianyang621000China

A novel triaxial vibration method is developed for the real-time characterization of the solid particle size distribution(PsD)in pneumatic particulate flow,which is critical for chemical *** this work,the particle-wall collision and friction behaviours were analysed by the time-domain statistical and timefrequency joint methods to narrow the high-frequency response range by the initial experiment of free fall for a single particle,interparticle,and multiple ***,verification experiments of PSD characterization in pneumatic flow were ***,the quantitative triaxial energy response model that considers the particle size,shape,and mass factors were ***,a good agreement of the particle number identification was found between the triaxial vibration energy and mean particle size of 150-550μ***,the performance with the best accuracy was focused on a range of 42-43 kHz in the x-axis and z-axis and 36.8-38.8 kHz in the ***,the individual particle energy was inversely analysed by the triaxial vibration response within the optimized frequency bands,and the PSD was characterized in real-time by a low error rate,that is,5.2% from the XZ-axis direction of sand(42-43 kHz)and 5.6% from the XYZ-axis of glass(30.9-33.9 kHz,46.2-47.2 kHz,38.3-41.3 kHz for each axis response).Therefore,this research complements the existing approaches for PsD characterization in particulate multiphase flow.

关键词： Solid particulate flow Triaxial vibration High-frequency response Particle wall Particle size distribution

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The Conversion of Non-Dispersed Polymers into Low-Potassium Anti-Collapse drilling Fluids

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Fluid Dynamics & Materials Processing 2024年第2期20卷 325-335页

作者： Hao Hu Jian Guan Shanfa Tang Jialuo Rong Yuanpeng Cheng School of Petroleum engineering Yangzte UniversityWuhan430100China Hubei Key Laboratory of oil and gas drilling and Production engineering Yangtze UniversityWuhan430100China School of Petroleum engineering Yangtze UniversityNational Engineering Research Center for Oil&Gas Drilling and Completion TechnologyWuhan430100China engineering technology research Institute of PetroChina Great Wall drilling engineering Co. Ltd.Panjin124000China

Different drillingﬂuid systems are designed according to mineral composition,lithology and wellbore stability of different *** the present study,the conversion of a non-dispersed polymer drillingﬂuid into a low potas-sium anti-collapsing drillingﬂuid is *** the two drillingﬂuids belong to completely different types,the key to this conversion is represented by new inhibitors,dispersants and water-loss agents by which a non-dispersed drillingﬂuid can be turned into a dispersed drillingﬂuid while ensuring wellbore stability and reason-able rheology(carrying sand—inhibiting cuttings dispersion).In particular,the(QYZ-1)inhibitors and(FSJSS-2)dispersants are *** former can inhibit the hydration expansion capacity of clay,reduce the dynamic shear force and weaken the viscosity;the latter can improve the sealing effect and reduce theﬁltrate *** results have shown that after adding a reasonable proportion of these substances(QYZ-1:FSJSS-2)to the non-dispersed polymer drillingﬂuid,while the apparent viscosity,plastic viscosity,structural viscosity andﬂuidity index under-went almost negligible changes,the dynamic plastic ratio increased,and theﬁltration loss decreased signiﬁcantly,thereby indicating good *** to the tests(conducted in the Leijia area),the density was 1.293 g/cm3,and after standing for 24 h,the SF(static settlement factor)was ***,theﬁltration loss was reduced to 4.0 mL,the rolling recovery rate reached 96.92%,with excellent plugging and anti-collapse performances.

关键词： Non-dispersed polymer drilling fluid low potassium anti-collapsing drilling fluid drilling fluid conversion drilling fluid reuse filter vector

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Optimization of Anti-Collapse drilling Fluid Systems with High Potassium Content

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1609-1622页

作者： Yu Xia Jian Guan Yong Gao Shanfa Tang Jialuo Rong School of Petroleum engineering Yangtze UniversityWuhan430100China Key Laboratory of drilling and Production engineering for oil and gas Wuhan430100China School of Petroleum engineering Yangtze University:National Engineering Research Center for Oil&Gas Drilling and Completion TechnologyWuhan430100China engineering technology research Institute of PetroChina Great Wall drilling engineering Co. Ltd.Panjin124000China PetroChina Fushun Petrochemical Branch Fushun113006China

The ash mudstone in some oil formations is highly *** oil formation is fractured,and the risk of well leakage and collapse is not *** study presents a countermeasure for well collapse prevention,based on a“force-chemistry synergistic balance”approach and the utilization of environmentally friendly and efficient hydration *** relevance of this approach is demonstrated considering a drilling fluid system with the high potassium *** analysis shows that the system can maintain good rheological properties,filtration loss and suspension stability even after aging at 130℃ for 16 *** primary roll recovery of rock chips is better than 98%.The secondary rolling recovery rate is 89%.The rapid water loss is close to *** effects of carrying rock,sand,hydration inhibition and dispersion of drill chips are all noticeable.

关键词： Mudstone hydration force-chemistry synergistic balance environmental protection high potassium content potent inhibition anti-collapse drilling fluid

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Effects of outer rim of rotors on performance of turbodrills

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排灌机械工程学报 2019年第3期37卷 199-203页

作者： GONG Pan GUO Chaohui FENG Ding WANG Peng ZHAO Yu XIANG Ru College of Mechanical engineering Yangtze University Hubei engineering research center for oil & gas drilling and completion Tools SINOPEC research Institute of Petroeum engineering Hubei Cooperative Innovation center of Unconventional oil and gas

Two turbine rotors with outer rim and without outer rim were designed to analyze the influence of outer rim of rotors on the performance of a turbodrill. Two 3D models of the turbine rotor with different structures were established by SolidWorks software. The numerical simulation analysis of the turbine with different rotor structures was carried out based on software of fluent and then the performance of them at different rotating speeds was obtained. The results show that the torque,pressure drop and hydraulic efficiency of the turbine rotor with outer rim are greater than that of the turbine rotor without outer rim. By comparing the turbine rotor with outer rim and without outer rim,its torque increases 20. 1%,pressure drop increases 8.7% and hydraulic efficiency increases 10.4% at the maximum efficiency point. The related research is of guiding significance to further optimization of turbine rotor structure.

关键词： turbine rotor outer rim performance numerical simulation

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A New Heat Transfer Model for Multi-Gradient drilling with Hollow Sphere Injection

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Fluid Dynamics & Materials Processing 2024年第3期20卷 537-546页

作者： Jiangshuai Wang Chuchu Cai Pan Fu Jun Li Hongwei Yang Song Deng School of Petroleum and Natural gas engineering Changzhou UniversityChangzhouChina CNPC research Institute of engineering technology Co. Ltd.BeijingChina national engineering research center for oil&gas drilling and completion technology BeijingChina College of Petroleum engineering China University of Petroleum(Beijing)BeijingChina College of Petroleum Karamay CampusChina University of Petroleum(Beijing)BeijingChina

Multi-gradient drilling is a new offshore drilling *** accurate calculation of the related wellbore temperature is of great significance for the prediction of the gas hydrate formation area and the precise control of the wellbore *** this study,a new heat transfer model is proposed by which the variable mass flow is properly taken into *** this model,the effects of the main factors influencing the wellbore temperature are *** results indicate that at the position where the separation injection device is installed,the temperature increase of the fluid in the drill pipe is mitigated due to the inflow/outflow of hollow spheres,and the temperature drop of the fluid in the annulus also *** addition,a lower separation efficiency of the device,a shallower installation depth and a smaller circulating displacement tend to increase the temperature near the bottom of the annulus,thereby helping to reduce the hydrate generation area and playing a positive role in the prevention and control of hydrates in deepwater drilling.

关键词： Multi-gradient drilling wellbore temperature hydrate separate injection device variable mass

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Reservoir characteristics of Donghe well No.1 in Tarim Basin

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International Journal of Mining Science and technology 2014年第5期24卷 719-724页

作者： Liao Taiping Hu Jingjing Lai Fuqiang Duan Yonggang School of Petroleum engineering Chongqing University of Science and Technology national oil and gas Exploration and Development Corporation Well completion center Southwest Petroleum University

Based on the techniques of X-ray diffraction analysis, identification of the thin sections of core cast, phys- ical analysis and scanning electron microscopy analysis, this paper studied the reservoir characteristics of the Carboniferous strata in Donghe well No.1 of Tarim region. The results show that the reservoir lithology is mainly the fine-grained quartz sandstone with ferrocalcite and pyrite, mud cement-based, the permeability concentrated in 5-40 × 10-3 μm2, a small part of the high permeability up to 150-327 ×10-3 μm2 and porosity ranged from 10% to 20%. The most part of the reservoirs is low perme- ability with a small part of the layer in moderate-high permeability. The types of reservoir space include intergranular pores, intra particle-molding pores, micro-pores and cracks, which mainly are intergranular pores with the pore diameter of 15-200 μm, 95.5μm on average. And the types of the throats are comolex with the main tvne of constricted l：hroats in this area and large contribution to the permeability.

关键词： Tarim Basin Carboniferous system Sandstone reservoir Physical characteristics Features of pore throats

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An improved high-efficiency anti-agglomerant for avoiding hydrate flow barriers in high water-cut systems: flowloop investigation and mechanisms

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Science China Chemistry 2024年

作者： Qingwen Kong Zhiyuan Wang Jihao Pei Jie Zhong Jianbo Zhang Shikun Tong Baojiang Sun School of Petroleum engineering China University of Petroleum (East China) national engineering research center of oil & gas drilling and completion technology SINOPEC research Institute of Safety engineering Co. Ltd.

In deepwater clean energy development(hydrates and natural gas), as well as carbon capture, utilization and storage(CCUS)technologies, the formation and aggregation of hydrates in high water-cut systems can create flow barriers and block pipelines or wellbores, causing economic losses even casualties. The anti-agglomerants(AAs) are known as both efficient and eco-friendly in preventing hydrate aggregation. However, due to the mass transfer promotion and low critical micelle concentration of AAs, they have not been widely used in industry. This study conducted a flowloop investigation on the evolution and prevention of hydrate flow barriers, and identified two primary hydrate blocking modes in high water-cut systems: rapid blocking(RB) by flocculated hydrates and gradual blocking by hydrate particle migration. Based on the cocamidopropyl dimethylamine's features, an improved high-efficiency anti-agglomerant, CDPKO, was developed. CDPKO prevented the emergence of RB, effectively reduced the hydrate aggregates of 150–500 μm, and prolonged the sum of hydrate induction and blocking times by 53.5%–126%.The five micro mechanisms of CDPKO were elucidated: moderate foaming, promote adsorption, steric hindrance, break water cage, and mildly promote formation. When compounded with a thermodynamic inhibitor(ethylene glycol, 5–15 wt%), CDPKO can reduce the usage of ethylene glycol by 64%–80%, while maintaining the original prevention effect.

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Subsection and superposition method for reservoir formation damage evaluation of complex-structure wells

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Petroleum Science 2023年第3期20卷 1843-1856页

作者： Guan-Cheng Jiang Yi-Zheng Li Yin-Bo He Teng-Fei Dong Ke-Ming Sheng Zhe Sun Collge of Petroleum engineering China University of Petroleum(Beijing)Bejing102249China State Key Laboratory of Petroleum Resources and Prospecting MOE Key Laboratory of Petroleum EngineeringChina Universityof Petroleum(Beijing)Beijing102249China College of Artificial Intelligence China University of Petroleum(Bejing)Beijing102249China Calgary Centre for Innovative technology University of CalgaryCalgaryAB T2N 1N4Canada national engineering research center of oil&gas drilling and completion technology

Kinds of complex-structure wells can effectively improve production,which are widely ***,in the process of drilling and completion,complex-structure wells with long drilling cycle and large exposed area of reservoir can lead to the fact that reservoir near wellbore is more vulnerable to the working fluid invasion,resulting in more serious formation *** order to quantitatively describe the reservoir formation damage in the construction of complex-structure well,taking the inclined well section as the research object,the coordinate transformation method and conformal transformation method are given according to the flow characteristics of reservoir near wellbore in anisotropic *** the local skin factor in orthogonal plane of wellbore is *** the un-even distribution of local skin factor along the wellbore,the oscillation decreasing model and empirical equation model of damage zone radius distribution along the wellbore direction are established and then the total skin factor model of the whole well is superimposed to realize the reservoir damage evaluation of complex-structure *** the skin factor model with the production model,the production of complex-structure wells can be predicted more *** two field application cases show that the accuracy of the model can be more than 90%,which can also fully reflect the invasion characteristics of drilling and completion fluid in any well section of complex-structure wells in anisotropic reservoir,so as to further provide guidance for the scientific establish-ment of reservoir production system.

关键词： Complex-structure wells Reservoir formation damage Reservoir anisotropy Skin factor Production prediction model

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