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Saturation evaluation of microporous low resistivity carbonate oil pays in Rub Al Khali Basin in the Middle East

Petroleum Exploration and Development 2022年第1期49卷 94-106页

作者： WANG Yongjun SUN Yuanhui YANG Siyu WU Shuhong LIU Hui TONG Min LYU Hengyu State Key Laboratory of Enhanced oil recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

To solve the problem that it is difficult to identify carbonate low resistivity pays(LRPs) by conventional logging methods in the Rub Al Khali Basin, the Middle East, the variation of fluid distribution and rock conductivity during displacement were analyzed by displacement resistivity experiments simulating the process of reservoir formation and production, together with the data from thin sections, mercury injection and nuclear magnetic resonance experiments. In combination with geological understandings, the genetic mechanisms of LRPs were revealed, then the saturation interpretation model was selected, the variation laws and distribution range of the model parameters were defined, and finally an updated comprehensive saturation interpretation technique for the LRPs has been proposed. In the study area, the LRPs have resistivity values of less than 1 Ω·m, similar to or even slightly lower than that of the water layers. Geological research reveals that the LRPs were developed in low-energy depositional environment and their reservoir spaces are controlled by micro-scale pore throats, with an average radius of less than 0.7 μm, so they are typical microporous LRPs. Different from LRPs of sandstone and mudstone, they have less tortuous conductive paths than conventional reservoirs, and thus lower resistivity value under the same saturation. Archie’s formula is applicable to the saturation interpretation of LRPs with a cementation index value of 1.77-1.93 and a saturation index value of 1.82-2.03 that are 0.2-0.4 lower than conventional reservoirs respectively. By using interpretation parameters determined by classification statistics of petrophysical groups(PGs), oil saturations of the LRPs were calculated at bout 30%-50%,15% higher than the results by conventional methods, and basically consistent with the data of Dean Stark, RST, oil testing and production. The 15 wells of oil testing and production proved that the coincidence rate of saturation interpretation is

关键词： carbonate low resistivity pays micropore type reservoir Archie’s formula cementation index saturation index Cretaceous Rub Al Khali Basin

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STUDY FOR STREAMLINE OF ARBITRARY SHAPED HOMOGENEOUS RESERVOIRS WITH IMPERMEABLE BARRIERS

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Journal of Hydrodynamics 2006年第3期18卷 329-333页

作者： YIN Hong-jun FU Chun-quan HE Ying-fu Key Laboratory of Enhanced oil and Gas recovery of Ministry of Education Daqing 163318 China Institute of Porous Flow and Fluid Mechanics CNPC and CAS Langfang 065007 China

The steady-state flow mathematical model of arbitrary shaped homogeneous reservoirs with impermeable barrier is constructed in this paper. By using Boundary Element Method （BEM）, the mathematical model is solved. And a streamline generating technique is presented. The figures of streamlines are plotted and analyzed considering the effect of complex boundary and impermeable barriers. Through analyzing it indicates that the size, shape and orientation of impermeable barriers have various degree of influence on the streamlines. So, if there are impermeable barriers in reservoir according to the geological materials, the influence of impermeable barriers must be considered when adjusting flood pattern and injection strategy.

关键词： Boundary Element Method (BEM) streamline,impermeable barrier mathematical model pressure

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Simulation of petroleum phase behavior in injection and production process of underground gas storage in a gas reservoir

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Petroleum Exploration and Development 2022年第6期49卷 1386-1397页

作者： WANG Jieming SHI Lei ZHANG Yu ZHANG Ke LI Chun CHEN Xianxue SUN Junchang QIU Xiaosong PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Key Laboratory of oil and Gas Underground Storage project of China National Petroleum Corporation Langfang 065007China China University of Petroleum Beijing 102249China State Key Laboratory of Heavy oil Processing Beijing 102249China State Key Laboratory of Enhanced oil recovery Beijing 100083China PetroChina Liaohe oilfield Company PetroChinaPanjin 124010China

On the basis of analyzing the fluid phase behavior during the transformation from gas reservoir to gas storage,a mathematical model and an experimental simulation method are established to describe the oil-gas phase behavior during the whole injection-production process of gas *** underground gas storage in the Liaohe Shuang 6 gas reservoir with oil rim is taken as a typical example to verify the reliability and accuracy of the mathematical model and reveal characteristics and mechanisms of fluid phase *** the gas injection stage of the gas storage,the phase behavior is characterized by mainly evaporation and extraction and secondarily dissolution and diffusion of gas in the cap to oil in the oil rim of the reservoir;the gas in gas cap increases in light component content,decreases in contents of intermediate and heavy components,and increases in density and *** oil of the ring decreases in content of heavy components,increases in contents of light and intermediate components,decreases in density and viscosity,and increases in volume factor and solution gas oil *** the stable operation stage of periodic injection-production of gas storage,the phase behavior shows that the evaporation and extraction capacity of injection gas in the cap to oil rim is weakened step by step,the phase behavior gradually changes into dissolution and *** gas in gas cap decreases in content of intermediate components,increases in content of light components slowly,and becomes lighter;but changes hardly in density and *** oil in the oil rim increases in content of heavy components,decreases in content of intermediate components,rises in density and viscosity,and drops in volume factor and solution gas oil ratio.

关键词： underground gas storage phase behavior characteristic mathematical model experimental simulation action mechanism

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Investigation of gravity influence on EOR and CO_(2) geological storage based on pore-scale simulation

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Petroleum Science 2024年第2期21卷 987-1001页

作者： Yong-Mao Hao Gui-Cheng Wu Zong-Fa Li Zhong-Hui Wu Yong-Quan Sun Ran Liu Xing-Xing Li Bo-Xin Pang Nan Li Key Laboratory of Unconventional oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina School of Petroleum Engineering Yangtze UniversityWuhan430100HubeiChina Dongsheng Jinggong Petroleum Development Group Co. LtdShengli Oilfield CompanySINOPECDongying257001ShandongChina

Gravity assistance is a critical factor influencing CO_(2)-oil mixing and miscible flow during EOR and CO_(2)geological *** on the Navier-Stokes equation,component mass conservation equation,and fluid property-composition relationship,a mathematical model for pore-scale CO_(2) injection in oilsaturated porous media was developed in this *** model can reflect the effects of gravity assistance,component diffusion,fluid density variation,and velocity change on EOR and CO_(2) *** nonhomogeneous porous media,the gravity influence and large density difference help to minimize the velocity difference between the main flow path and the surrounding area,thus improving the oil recovery and CO_(2) *** CO_(2) injection angles and oil-CO_(2) density differences can increase the oil recovery by 22.6% and 4.2%,respectively,and increase CO_(2) storage by 37.9% and 4.7%,*** diffusion facilitates the transportation of the oil components from the low-velocity region to the main flow path,thereby reducing the oil/CO_(2) concentration difference within the porous *** diffusion can increase oil recovery and CO_(2) storage by 5.7% and 6.9%,*** addition,combined with the component diffusion,a low CO_(2) injection rate creates a more uniform spatial distribution of the oil/CO_(2) component,resulting in increases of 9.5% oil recovery and 15.7% CO_(2) storage,*** study provides theoretical support for improving the geological CO_(2) storage and EOR processes.

关键词： Gravity Flow simulation CO_(2)-oil mixing Enhanced oil recovery(EOR) Geological storage

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Prediction of Cuttings-Induced Annular-Pressure Loss in Extended-Reach Wells

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Fluid Dynamics & Materials Processing 2023年第11期19卷 2877-2890页

作者： Long Wang Qingyun Shen Gui Wang Key Laboratory of Enhanced oil recovery in Fracture-Vug Reservoir SINOPECUrumuqi830011China State Key Laboratory of oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China

Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling *** these cuttings enter the annulus,they have an effect on the drillingfluid rheology and density,which is,in general,quite difficult to *** introducing an empirical correlation for the rheological properties of cuttings-laden drillingfluids,this study proposes a pres-sure-loss prediction method for an extended-reach well(ERW).After verifying the accuracy of this method,a case study is considered and a sensitivity analysis is conducted assuming a yield-power *** results show that an increased concentration of cuttings in the annulus contributes to an increased annular pressure ***-pared to their effect on the drillingfluid density,cuttings have a greater impact on the drillingfluid rheology.A larger rate of penetration contributes to an increased annular pressure *** higher drillingfluidflow rates,the annular pressure lossfirst decreases and then it *** addition,the annular pressure loss becomes high-er as the cuttings’particle size decreases and the cuttings’concentration grows.

关键词： Pressure loss cuttings extended-reach well yield-power law model drillingfluid

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Productivity prediction model and optimal configuration of herringbone multilateral well

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Journal of Central South University 2013年第3期20卷 770-775页

作者：蔡明尹洪军钟会影付春权 Accumulation and Development of Unconventional oil and Gas State Key Laboratory Cultivation Base Jointly-constructed by Heilongjiang Province and the Ministry of Science and Technology(Northeast Petroleum University) Key Laboratory of Enhanced oil and Gas recovery of Ministry of Education (Northeast Petroleum University)

In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was *** based on this model,orthogonal test and multiple factor variance analysis were applied to study optimization design of herringbone multilateral *** to the characteristics of herringbone multilateral well,by using pressure superposition and mirror image reflection theory,the coupled model of herringbone multilateral well was developed on the basis of a three-dimensional pseudo-pressure distribution model for horizontal *** model was formulated in consideration of friction loss,acceleration loss of the wellbore and mixed loss at the confluence of main wellbore and branched *** mathematical simulation on productivity of the herringbone multilateral well with the coupled model,the effects of well configuration on productivity were *** results show that lateral number is the most important factor,length of main wellbore and length of branched wellbore are the secondary ones,angle between main and branched one has the least influence.

关键词： herringbone multilateral well wellbore pressure drop productivity prediction optimization design

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Study on the thixotropy and structural recovery characteristics of waxy crude oil emulsion

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Petroleum Science 2021年第4期18卷 1195-1202页

作者： Li-Ping Guo Xue Han Yun Lei Lei Wang Peng-Fei Yu Shuang Shia Key Laboratory of Enhanced oil recovery Ministry of EducationNortheast Petroleum UniversityHeilongjiang163000China Jiangsu Key Laboratory of oil and Gas Storage&Transportation Technology Changzhou UniversityJiangsu213164China Exploration and Development Research Institute Daqing Oil Field Company LtdDaqingHeilongjiang163712China

Waxy crude oil emulsion has thixotropic properties at the temperature near gel point,which is a macromechanical characterization of the structure failure and recovery of waxy crude oil *** this paper,the thixotropic behaviors of waxy crude oil emulsion near gel point were studied using hysteresis loop formed by stress linear increase and decrease,as well as the structural recovery *** influence of the loading conditions and water content on the thixotropy of waxy crude oil emulsion were analyzed with hysteresis loop *** concept of"structural recovery"was introduced to study the degree of structural recovery after different stewing,and influencing factors were taken into *** have shown that for waxy crude oil emulsion,the failure to fully restore of the structure after lysis is the cause of the formation of hysteresis loop,and the loading conditions will not affect the strength of thixotropy and the degree of structural ***,the dispersed phase droplets weaken the thixotropy and structure recovery characteristics of waxy crude oil emulsion,and the greater the water content,the weaker the *** findings can help to better understand the safe and economic operation of waxy crude oil-water pipeline transportation.

关键词： Waxy crude oil Emulsion Thixotropic properties Structural recovery Hysteresis loop

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Genetic models of structural traps related to normal faults in the Putaohua oilfield,Songliao Basin

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Petroleum Science 2008年第4期5卷 302-307页

作者： Sun Simin Wu Xinsong Liu Hongtao Wang Changsheng School of Resources and Information Technology China University of Petroleum Beijing 102249 China oil recovery Plant No.7 Daqing Oilfield Company PetroChina Daqing Heilongjiang 163517 China

The Putaohua oilfield is a fault-prolific area and the faults have close relation with structural traps. The genetic models of the structural traps in the Putaohua oilfield can be divided into two types： individual fault model and multi-fault interaction model. This is based on the description of displacement distribution of typical individual normal faults, the geometry of the footwall and hanging wall, and the analysis of the interaction between faults and the corresponding change in geometry when the faults grow. The individual fault model is that the displacement reaches a maximum at or near the center of fault and decreases toward the fault tips, so a half-graben is formed on the hanging wall of the fault and a half- anticline is formed on the footwall because of the isostatic process. The multi-fault interaction model is that during the growth of faults, they overlap and interact with each other, and accommodation zones are formed in the overlapping segments. The accommodation zones are favorable targets for hydrocarbon exploration, and the trap characteristics are dependent The multi-fault interaction model can be subdivided on the extent of overlap and occurrence of faults. into three types： synthetic accommodation zone, convergent accommodation zone and divergent accommodation zone. Hydrocarbon migration and accumulation models of each type have been developed. The hydrocarbon migration and accumulation models of the traps with different genetic models have their own characteristics in the different stages of fault growth.

关键词： Songliao Basin Putaohua oilfield accommodation zone normal fault growth structural trap

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Lithofacies paleogeography restoration and its significance of Jurassic to Lower Cretaceous in southern margin of Junggar Basin,NW China

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Petroleum Exploration and Development 2022年第1期49卷 78-93页

作者： GAO Zhiyong SHI Yuxin FENG Jiarui ZHOU Chuanmin LUO Zhong Petroleum Geology Research and Laboratory Center PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China State Key Laboratory of Enhanced oil recovery Beijing 100083China

In view of the difficulties in the study of lithofacies paleogeography and the low reliability of the distribution range of sedimentary sand bodies in the prototype basin caused by less deep drilling, complex seismic imaging and low degree of exploration in the southern margin of Junggar Basin, NW China. A new method based on the source to sink idea was used to restore lithofacies paleogeography and predict glutenite distribution. In the restoration, apatite fission track age was used to define range and uplift time of macro-provenance;the range of provenance area and the migration process of lake shoreline were restored based on the quantitative relationship between gravel diameter and transportation distance, tectonic shortening and other geological parameters;drilling cores and field outcrop sedimentary structures were analyzed, and a series of maps of lithofacies paleogeographic evolution and distribution range of glutenite bodies were compiled. It is concluded that from Early Jurassic to Early Cretaceous, in the southern margin of Junggar Basin, the provenance area gradually expanded from south to north, the lake basin expanded, shrunk and expanded, and the paleoclimate changed from humid to drought to humid. The western section always had proximal fan delta deposits from the southern ancient Tianshan provenance developed, and in the middle and eastern sections, the provenance areas evolved from far source to near source, mainly river-delta, braided delta, fan delta and other sediments developed. The boundary between provenance areas of the western and middle sections is speculated to be Hongche fault zone. In an angle open to the northwest with the current basin edge line, the restored ancient lake shoreline controlled the heterogeneity of reservoirs in the delta plain belt and delta front belt on its both sides. The ancient lake shoreline, current stratigraphic denudation line and current basin margin line limit the types and scope of favorable ***

关键词： southern margin of Junggar Basin deep lower assemblage Jurassic Cretaceous provenance lake shoreline lithofacies paleogeography favorable sandbody distribution

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SEEPAGE ABILITY OF HIGH-PRESSURE HOT COMPOSITE FOAM IN POROUS MEDIA

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Journal of Hydrodynamics 2010年第1期22卷 90-95页

作者： WANG Ke-liang LIANGShou-cheng YUAN Xin-qiang CHEN Jin-feng The Key Laboratory of Enhanced oil and Gas recovery of the Ministry of Education Daqing Petroleum Institute Daqing 163318 China College of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China The Second oil Production Company of Daqing oilfield Company Ltd. Daqing 163414 China

The technology of hot composite foam displacement refers to the injection of high-temperature flue gas and foaming and stabilizing agent into wells with a certain concentration, and after meeting the formation water, a composite foam system is formed in the reservoir. This foam displacement technology involves thermal function and so is related to nitrogen, carbon dioxide and foam flooding characteristics. After analyzing seepage flow law of hot composite foam system, seepage flow experiment of composite foam under high pressure was conducted, and seepage flow ability of hot composite foam in porous media was investigated. In the experiment, surfactant HY-3 was chosen as the foaming agent and hot flue gas was chosen as the foaming gas, and high-pressure hot foaming apparatus was employed in experiments. The experimental results indicate that the surfactant HY-3 could form stable foam in porous media, and the foam has strong ability of plugging. It is concluded that the sealing performance of foam is improved with increasing permeability and resistance coefficient and with incresing injection rate and foam strength. After foam injection, sealing characteristics of heterogeneous cores is better than that of homogeneous cores. The foam pressure has a process of transmission in porous media. In this process, with the increase of injection volume, pressure from the inlet to the outlet increases gradually, which indicates that stable foam has been formed inside the core.

关键词： composite foam surfactant HY-3 seepage flow under high pressure porous media

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