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Evaluating the stability and volumetric flowback rate of proppant packs in hydraulic fractures using the lattice Boltzmann-discrete element coupling method

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2052-2063页

作者： Duo Wang Sanbai Li Rui Wang Binhui Li Zhejun Pan National Key Laboratory of Continental Shale Oil Northeast Petroleum UniversityDaqing163318China institute of Unconventional Oil&Gas Northeast Petroleum UniversityDaqing163318China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen518055China National Center for Applied Mathematics Shenzhen(NCAMS) Southern University of Science and TechnologyShenzhen518055China National Key Laboratory of Continental Shale Oil Daqing Oilfield of CNPCDaqing163002China daqing oilfield Exploration and Development Research institute DaqingHeilongjiang163712China

The stability and mobility of proppant packs in hydraulic fractures during hydrocarbon production are numerically investigated by the lattice Boltzmann-discrete element coupling method(LB-DEM).This study starts with a preliminary proppant settling test,from which a solid volume fraction of 0.575 is calibrated for the proppant pack in the *** the established workflow to investigate proppant flowback,a displacement is applied to the fracture surfaces to compact the generated proppant pack as well as further mimicking proppant embedment under closure *** a pressure gradient is applied to drive the fluid-particle flow,a critical aperture-to-diameter ratio of 4 is observed,above which the proppant pack would *** results also show that the volumetric proppant flowback rate increases quadratically with the fracture aperture,while a linear variation between the particle flux and the pressure gradient is exhibited for a fixed fracture *** research outcome contributes towards an improved understanding of proppant flowback in hydraulic fractures,which also supports an optimised proppant size selection for hydraulic fracturing operations.

关键词： Numerical simulation Hydraulic fracturing Proppant flowback Closure stress Particulate flow

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Reaction mode between Si and Fe and evaluation of optimal species in poly-silicic-ferric coagulant

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Journal of Environmental Sciences 2007年第6期19卷 678-688页

作者： FU Ying YU Shui-li YU Yan-zhen QIU Li-ping HUI Ban School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Civil and Architectural Engineering University of Jinan Jinan 250022 China Extraction the Fourth Factory Daqing Oilfield Company Ltd. Daqing 163113 China

A kind of Fe-polysilicate polymer, poly-silicic-ferric （PSF） coagulant was prepared by co-polymerization （hydroxylation of mixture of Fe^3＋ and fresh polysilicic acid （PS））, in which PSF0.5, PSF1 or PSF3 denotes Si/Fe molar ratio of 0.5, 1 or 3, respectively. The effects of Si/Fe ratio and reaction time （co-polymerization time or aging time） on the reaction mode between Si and Fe were studies, and the optimal species of PSF was evaluated by pH change during the preparation of PSF and coagulation tests. The results showed that the characteristics of PSF are largely affected by both reaction time and Si/Fe ratio. PSF is found to be a essential complex of Si, Fe, and many other ions. The reaction mode between Si and Fe differs with various Si/Fe ratios. The pH of PSF0.5, PSF1 or PSF3 tended to be stable when reaction time is 10, 25 or 55 rain, respectively, which is almost consistent with the time reaching the relative stable morphology that is just the optimal species of higher coagulation efficiency. The optimal reaction time reaching optimal species can be evaluated by measuring the pH change during the polymerization process.

关键词： poly-silicic-ferric coagulant reaction mode optimal species

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Laminated Reservoir Fracturing Technique

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China Oil & Gas 2002年第4期9卷 32-34页

作者： Pei Xiaohan, Ban LiOil production technology institute of daqing oilfield Company Ltd Oil production technology institute of daqing oilfield Company Ltd

1. Balance Fracturing Techniques are suitable to many types of laminatedreservoirs. The impermeable barrier that is more than 0.4 meter cannot be damaged. 4 more laminatedlayers can be fractured in one trip. 2. After fracturing, fractures in the balance layers are closedbecause there is no proppant in them. It is proved that there is no need to plug the balance layer.3. By using the Balance Fracturing Technique, the laminated reservoirs can be stimulatedeffectively. And the field practice proves that, to stimulate laminated reservoirs, the BalanceFracturing Technique is superior to the normal limited entry fracturing technique.

关键词：垒层储集层大庆油田平衡压裂技术油层水层

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Differences in and factors controlling organic matter enrichment in the Ziliujing Formation shale in the Sichuan Basin

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Petroleum Science 2024年第1期21卷 77-86页

作者： Peng Li Zhong-Bao Liu He Bi Tao Jiang Rui-Kang Bian Peng-Wei Wang Xiao-Yu Shang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development Beijing102206China Key Laboratory of Shale Oil/Gas Exploration and production technology SINOPECBeijing102206China Petroleum Exploration and production Research institute SINOPECBeijing102206China Research institute of Petroleum Exploration and Development PetroChinaBeijing100083China Chinese Academy of Geological Sciences Beijing100037China No.4 Oil production Plant in daqing oilfield Co Ltd. Daqing163511HeilongjiangChina

Lacustrine shale oil and gas are important fields for unconventional exploration and development in China,and organic-rich shale deposition lays down the critical foundation for hydrocarbon *** are two sets of shale,the Dongyuemiao and Da’anzhai Members,in the Ziliujing Formation in the Sichuan *** identify the differential enrichment characteristics of organic matter and clarify its controlling factors,geochemical analyses of organic and inorganic geochemical analyses were *** results showed that the total organic carbon content of the Dongyuemiao shale(1.36%)is slightly higher than that of the Da’anzhai shale(0.95%).The enrichment of organic matter in the two shales resulted from the comprehensive controls of paleoproductivity,paleoenvironment,and terrigenous input,but different factors have different *** addition,driven by climate,the change in the sulfate concentration in the bottom water further led to the different intensities of bacterial sulfate reduction in early *** made a great difference regarding organic matter accumulation in the two *** general,climate may have played a dominant role in organic matter enrichment in the two sets of shale.

关键词： Lacustrine shale Ziliujing Formation Sichuan Basin Enrichment mechanism of organic matter

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The Effect of Surfactant on Synthesis of ZSM-5 in a Super-Concentrated System

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China Petroleum Processing & Petrochemical technology 2016年第3期18卷 35-40页

作者： Li Haiyan Qin Lihong Gao Guangbo Sun Famin daqing Chemical Research Center Petrochemical Research InstitutePetro China Company LimitedDaqing 163714 China University of Petroleum Beijing 102249 Liaohe oilfield Company production Operation Division Petro China Company LimitedPanjin 124010

ZSM-5 zeolite was synthesized in a super-concentrated system using different kinds of surfactants. The ZSM-5 samples were characterized by XRD, SEM, FT-IR and BET techniques. The surfactant could change the properties of ZSM-5 zeolite, including the crystallinity, the crystal grain size, the surface area, the pore volume and the Si/Al mole ratio.

关键词： ZSM-5 super concentrated surfactant

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Characteristics of breccia lava reservoirs and analysis of their dominant factors: case study of the Xushen gas field located in the Songliao Basin

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Mining Science and technology 2010年第1期20卷 109-114页

作者： WANG Zhiqiang LIU Chengzhi WANG Wenguang TIAN Zhao LI Minghui SUN Wei College of Resources and Information China University of Petroleum Beijing 102249 China School of Earth Sciences Daqing Petroleum Institute Daqing 163318 China Hulunbei'er Branch Company Daqing Oilfield Co. Ltd. Hailaer 021008 China daqing Yushulin oilfield Development Co. Ltd. Daqing 163453 China Drilling technology Service Company No. 1 Daqing Drilling & Exploration Engineering Corporation Daqing 163000 China

Breccia lava is a type of rock in transition between volcanic clastic rock and lava. Its physical properties are compara-tively special, while the nature of its genesis and the formation of reservoirs, deposits and concentrations vary considerably. In order to discover the different genesis for breccia lava reservoirs, our study has been carried out on breccia lava for its rock constituents, structures, diagenesis and reconstruction from tectonic movements to mineral depositions. From our analysis, we conclude that the main type of reservoir is a secondary emposieu, where rock compositions, structures, diagenesis and tectonic action are the major contributing factors to the deposition of breccia lava and its properties. Diagenesis constrained the extent of conservation of the primary pore of breccia lava and produced secondary porosity. The roles of tectonics were played out through the formation controlling tectonic fissures inside breccia lava and affected the impermeability of breccia lava fluids. The constituents of lava rock determine directly the type of diagenesis and its response to tectonic action. At the time of appropriate rock composition and structures, constructive formation occurred to breccia lava. Breccia lava also responded proactively to tectonic movements, forming the best quality collective reservoir agglomerations of vast spaces and strong permeability.

关键词： breccia lava diagenesis volcanic rock reservoir

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Online monitoring of gas-solid two-phase flow using projected CG method in ECT image reconstruction

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Particuology 2013年第2期11卷 204-215页

作者： Qi Wang Chengyi Yang Huaxiang Wang Ziqiang Cui Zhentao Gao School of Electrical Engineering & Automation Tianjin University Oil production technology Research institute of Huabei oilfield Co.

Electrical capacitance tomography （ECT） is a promising technique for multi-phase flow measurement due to its high speed, low cost and non-intrusive sensing. Image reconstruction for ECT is an inverse problem of finding the permittivity distribution of an object by measuring the electrical capacitances between sets of electrodes placed around its periphery. The conjugate gradient （CG） method is a popular image reconstruction method for ECT, in spite of its low convergence rate. In this paper, an advanced version of the CG method, the projected CG method, is used for image reconstruction of an ECT system. The solution space is projected into the Kryiov subspace and the inverse problem is solved by the CG method in a low-dimensional specific subspace. Both static and dynamic experiments were carried out for gas-solid two-phase flows. The flow regimes are identified using the reconstructed images obtained with the projected CG method. The results obtained indicate that the projected CG method improves the quality of reconstructed images and dramatically reduces computation time, as compared to the traditional sensitivity, Landweber, and CG methods. Furthermore, the projected CG method was also used to estimate the important parameters of the pneumatic conveying process, such as the volume concentration, flow velocity and mass flow rate of the solid phase. Therefore, the projected CG method is considered suitable for online gas-solid two-phase flow measurement,

关键词： Electrical capacitance tomography (ECT) Image reconstruction Conjugate gradient method (CG) Krylov subspace

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Research on daqing Changyuan Peripheral oilfield Fracturing Network Candidate Selection Standard

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 326-327页

作者： WANG Yunlong daqing oilfield Exploration and Development institute

In hydraulic fracturing process, if fracture extension net pressure is greater than the difference of two horizontal stresses at both ends of the fracture and greater than the sum of the tensile strength at both side of rock soil, a main fracture will be converted into multiple split fractures which are considered as fracture network, a system formed by such interleaving. technology which is used to realize such fracture network effect is hereby called as ＂fracture network＂ fracturing technique.

关键词： RESERVOIRS HYDRAULIC fracturing OIL fields PETROLEUM reservoirs PETROLEUM production CHINA

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Mechanical characteristics and reservoir stimulation mechanisms of the Gulong shale oil reservoirs, the northern Songliao Basin

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Petroleum Science 2024年第3期21卷 2023-2036页

作者： Si-Wei Meng Jia-Ping Tao Tian-Jiao Li Dong-Xu Li Su-Ling Wang Liu Yang Xin Liu Li-Hao Liang He Liu PetroChina Research institute of Petroleum Exploration Development Beijing100083China National Key Laboratory of Continental Shale Oil Daqing 163002HeilongjiangChina Dalian University of technology Dalian116024LiaoningChina PetroChina daqing oilfield Co.Ltd. Daqing163002HeilongjiangChina Northeast Petroleum University Daqing163002HeilongjiangChina China University of Mining and technology(Beijing) Beijing100083China

Shale oil of the Qingshankou Formation of the Gulong Sag,the northern Songliao Basin,represents the first attempt at large-scale development of pure-shale-type shale oil in *** integrating the multiscale refined reservoir characterization with macro-micro-scale mechanical testing,it is clarified that the Gulong shale is characterized by high clay mineral content,high rock plasticity,highly-developed bedding,and prominent mechanical anisotropy.A three-dimensional(3D)fracture propagation model of hydraulic fracturing was built for the Gulong shale,which fully captures the hydraulic fracture distribution pattern affected by the high bedding density,in-situ stress,and fracturing treatment *** research showed that due to influences of bedding,hydraulic fracturing in the Gulong shale forms a complex fracture morphology featuring the main fracture with multiple perpendicular branches that have different lengths(like the outdoor directional TV antenna);however,the vertical propagation of fractures is inhibited,and the fracture height is commonly less than 10 *** limited stimulated reservoir volume(SRV)is the main problem facing the fracturing stimulation of the Gulong shale *** density has vital effects on fracture morphology,so case-specific fracturing designs shall be developed for shale intervals with different bedding development *** reservoirs with welldeveloped bedding,it is suggested to properly increase the perforation cluster spacing and raise the volume and proportions of viscous fluids of the pad,so as to effectively promote vertical fracture propagation and improve reservoir stimulation *** study integrates multi-scale fine reservoir characterization and macro-micro-scale mechanical testing,as well as the construction and numerical simulation of hydraulic fracturing models for high-density layered shale reservoirs,providing a new approach and methodological framework for the fracturing research of high-density layer

关键词： Shale oil Hydraulic fracturing High bedding density Fracture propagation model

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Optimal Design of Improved L-shaped Coprime Array Based on Difference and Sum Co-array

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Journal of Beijing institute of technology 2020年第3期29卷 379-385页

作者： Rui Fang Xiangnan Li Haixia Wu Wei Gao Shiwei Ren Oil production technology Research institute Dagang Oilfield CompanyTianjin 300280China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

The concept of difference and sum co-array(DSCA)has become a new design idea for planar sparse *** by the shifting invariance property of DSCA,a specific configuration named here as the improved L-shaped array is *** to other traditional 2D sparse array configurations such as 2D nested arrays and hourglass arrays,the proposed configuration has larger central consecutive ranges in its DSCA,thus increasing the *** the same time,the mutual coupling effect is also reduced due to the enlarged spacing between the adjacent *** further demonstrate the superiority of the proposed arrays in terms of detection performance and estimation accuracy.

关键词： planar array geometry two-dimensional direction of arrival estimation differencesum co-array mutual coupling

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