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Study on the Impact of Massive Refracturing on the Fracture Network in Tight oil Reservoir Horizontal Wells

Fluid Dynamics & Materials Processing 2024年第5期20卷 1147-1163页

作者： Jianchao Shi Yanan Zhang Wantao Liu Yuliang Su Jian Shi Exploration and Development Research Institute Changqing Oilfield CompanyXi’an710018China National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields Xi’an710018China Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580China

Class III tight oil reservoirs have low porosity and permeability,which are often responsible for low production rates and limited *** repeated fracturing is a well-known technique to fix some of these *** such methods,existing fractures are refractured,and/or new fractures are created to facilitate communication with natural *** study explored how different refracturing methods affect horizontal well fracture networks,with a special focus on morphology and related fluid flow *** particular,the study relied on the unconventional fracture model(UFM).The evolution of fracture morphology and flow field after the initial fracturing were analyzed *** simulation results indicated that increased formation energy and reduced reservoir stress differences can promote fracture *** was shown that the length of the fracture network,the width of the fracture network,and the complexity of the fracture can be improved,the oil drainage area can be increased,the distance of oil and gas seepage can be reduced,and the production of a single well can be significantly increased.

关键词： Type III tight oil reservoirs refracturing methods horizontal wells fracture network study fracture network evolution

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Sources and exploration potential of Ordovician subsalt natural gas in Ordos Basin, China

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Journal of Natural gas Geoscience 2024年第6期9卷 401-416页

作者： Kong, Qingfen Kong, Linyin Yao, Jingli Ren, Junfeng Wu, Kai Zhao, Taiping Research Institute of Exploration and Development Changqing Oilfield Company CNPC Xi'an 710018 China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields Xi'an 710018 China

With the continuous increase in exploration efforts in new zones and new strata, significant breakthroughs have been made in the natural gas exploration of the O1m56 to O1m4 formations in the Ordos Basin. Thus, the or... 详细信息

With the continuous increase in exploration efforts in new zones and new strata, significant breakthroughs have been made in the natural gas exploration of the O₁m₅⁶ to O₁m₄ formations in the Ordos Basin. Thus, the origin and exploration potential of subsalt natural gas have attracted much attention and urgently need to be addressed. On the basis of certain geochemical characteristics, genetic types, and sources of natural gas, a comprehensive study on the sedimentary environment, organic geochemical characteristics, and spatial distribution scale of source rocks are conducted in this paper by using geological and geochemical methods. The study shows that: (1) The Ordovician subsalt natural gas is mainly “pyrolysis dry gas,” among which the δ¹³C₁ of Ordovician subsalt low sulfur (sulfur-free) natural gas is lighter, with an average value of −39.6‰;the δ¹³C₂ ranges more largely from −35.6‰ to −25.8‰. In contrast, both δ¹³C₁ and δ¹³C₂ values are heavier in high-sulfur natural gas, revealing that different Thermochemical Sulfate Reduction (TSR) reaction stages have different degrees of influence on natural gas components and carbon isotope composition. (2) Subsalt natural gas is classified as “oil-type gas,” which is self-generated and self-accumulated, whose source rocks are mainly Ordovician subsalt marine deposits. (3) Three types of marine source rocks are developed in Ordovician subsalt, including black argillaceous rock, dark argillaceous dolomite (dolomitic mudstone), and dark micrite (bioclastic) limestone. In addition to micrite limestone, these rocks were mainly formed in a confined lagoon sedimentary environment with high salinity and anoxia. Sedimentary water was significantly stratified and the environment was highly reduced. The organic matter content of the source rocks is relatively high, with an average TOC valu

关键词： Genesis of natural gas Marine source rocks Ordos Basin Ordovician Subsalt

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Adaptability of low Molecular Weight Salt-Resistant Hydrophobic Associating Polymer in low permeability Reservoir 13th

Adaptability of Low Molecular Weight Salt-Resistant Hydropho...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Tian, Qian-Qian Jia, Jun-Hong Wang, Li-Li Shangguan, Yang-Nan Wang, Jing-Hua Yuan, Guo-Wei Liu, Lei Exploration and Development Research Institute of Changqing Oilfield Company Xi’an China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields Xi’an China

ISBN: (纸本)9789819702633

B3 block of Changqing oilfield has low reservoir permeability and high salinity formation water. In order to solve the problems of poor injection and salt resistance of conventional polymers and further improve the development effect of polymer flooding, the adaptability of low molecular weight anti-salt hydrophobic associating polymers in this test area is studied. The viscosity, salt resistance, shear resistance, adsorption resistance and aging stability of the polymer were measured by laboratory experiments. The experimental results show that compared with polyacrylamide and functional polymer, the low molecular weight salt-resistant hydrophobic associating polymer has better salt resistance, shear resistance and stability. The viscosity of 2000 mg/L polymer is 28 mPa·s at 50 ℃ and 13600 mg/L mineralization (572 mg/L calcium and magnesium ion concentration). The core with 70–80 mD permeability was used for oil displacement experiments. The results showed that the viscosity retention rate of polymer flooding solution reached 80%, and the oil displacement efficiency can be improved by 14.8% on the basis of water flooding. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Viscosity

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Reservoirs Characteristics and Main Controlling Factors of Deep Buried Tight Sandstones: A Case Study of the 1th Member of the Upper Paleozoic Shanxi Formation in Qingyang gas Field, Southwestern Ordos Basin 13th

Reservoirs Characteristics and Main Controlling Factors of D...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Cao, Jiang-Jun Wang, Ji-Ping Zhang, Dao-Feng Wang, Long Li, Xiao-Tian Li, Ya Zhang, Yuan-Yuan Xia, Hui Research Institute of Exploration and Development PetroChina Changqing Oilfield Company Xi’an China National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Field Xi’an China

ISBN: (纸本)9789819704637

In order to study the characteristics of deep buried tight sandstone reservoirs, analyze the main controlling factors of reservoirs. Based on the data of casting thin sections, scanning electron microscopy, high-pressure mercury injection and physical properties, the 1th member of the Upper Paleozoic Shanxi Formation in Qingyang gas field was studied. The results show that. (1) the 1th member of the Shanxi Formation is the meandering river delta sedimentary environment, with the development of delta plains and front subfacies. Distributary channel is the main sedimentary microfacies, which can be divided into three types of sub-microfacies, including the core part, the middle part and the edge of the distributary channel. The sandstone maturity under the influence of sedimentation controls the initial porosity of the reservoir, which in turn determines its current physical properties. The reservoir of the channel core part has the highest maturity, the largest initial porosity, the best pore throat connectivity, the highest physical property and the best gas content. (2) Diagenesis increases the densification degree of the reservoir. The reservoir of the 1th member of the Upper Paleozoic Shanxi Formation has experienced the diagenetic evolution process of strong-moderate compaction → moderate-weak cementation → weak dissolution. Compaction is the most important diagenesis type affecting the degree of reservoir densification. (3) The deep faults produced by tectonic movement provide channels for hydrocarbon fluid migration. On the whole, sedimentation is the basis of affecting the physical properties of the reservoir, diagenesis is the main factor controlling the degree of the reservoir densification, and tectonic movement is the key to determining the current seepage capacity of the reservoir. Affected by sedimentation - diagenesis - tectonic movement - pore evolution, the quality of plain subfacies reservoir is better than that of front subfacies. The reservoir can

关键词： gas industry

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Research on Energy Supplement development Mode of High Angle oil Well in Ultra-low permeability Reservoir 13th

Research on Energy Supplement Development Mode of High Angle...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Tan, Xi-Qun Wei, Ming-Xia Wang, Yuan-Qing Wang, Jing Liu, Jun-Gang Yang, Huan-Ying Lu, Xue-Jiao Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi’an China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields Xi’an China

ISBN: (纸本)9789819704743

Changqing ultra-low permeability reservoir is tight, and it can only improve the initial production of this kind of reservoir by adopting high inclination or horizontal well type and forming complex fractures through fracturing transformation. However, the initial decline is large. At the same time, affected by natural fractures, pressure fractures and dynamic fractures, water injection will lead to rapid water breakthrough in oil wells. In view of the above problems, on the basis of previous theoretical research and field practice, the development method of water injection huff and puff to supplement energy in highly deviated oil wells is proposed. Water injection huff and puff can effectively supplement formation energy and improve single well production. Through numerical simulation, the effects of fracture half-length, injection pressure, water injection timing, water injection rate, water injection rate, well shut-in time and other factors on the huff and puff effect are studied, and the relevant parameters of water injection huff and puff for ultra-low permeability reservoirs are determined. The field practice has confirmed the effectiveness of water injection huff and puff, and has achieved certain stimulation effect. Water injection huff and puff can become a water injection development mode to play the potential of ultra-low permeability. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Fracture

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Mechanisms of fine-grained sedimentation and reservoir characteristics of shale oil in continental freshwater lacustrine basin:A case study from Chang 7_(3) sub-member of Triassic Yanchang Formation in southwestern Ordos Basin,NW China

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Petroleum exploration and development 2025年第1期52卷 95-111页

作者： LIU Xianyang LIU Jiangyan WANG Xiujuan GUO Qiheng Lv Qiqi YANG Zhi ZHANG Yan ZHANG Zhongyi ZHANG Wenxuan PetroChina Changqing Oilfield Company Xi’an 710018China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields Xi’an 710018China Yangtze University Wuhan 430100China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

Based on recent advancements in shale oil exploration within the Ordos Basin,this study presents a comprehensive investigation of the paleoenvironment,lithofacies assemblages and distribution,depositional mechanisms,and reservoir characteristics of shale oil of fine-grained sediment deposition in continental freshwater lacustrine basins,with a focus on the Chang 7_(3) sub-member of Triassic Yanchang *** research integrates a variety of exploration data,including field outcrops,drilling,logging,core samples,geochemical analyses,and flume *** study indicates that:(1)The paleoenvironment of the Chang 7_(3) deposition is characterized by a warm and humid climate,frequent monsoon events,and a large water depth of freshwater lacustrine *** paleogeomorphology exhibits an asymmetrical pattern,with steep slopes in the southwest and gentle slopes in the northeast,which can be subdivided into microgeomorphological units,including depressions and ridges in lakebed,as well as ancient channels.(2)The Chang 7_(3) sub-member is characterized by a diverse array of fine-grained sediments,including very fine sandstone,siltstone,mudstone and *** sediments are primarily distributed in thin interbedded and laminated arrangements *** overall grain size of the sandstone predominantly falls below 62.5μm,with individual layer thicknesses of 0.05–0.64 *** deposits contain intact plant fragments and display various sedimentary structure,such as wavy bedding,inverse-to-normal grading sequence,and climbing ripple bedding,which indicating a depositional origin associated with density flows.(3)Flume simulation experiments have successfully replicated the transport processes and sedimentary characteristics associated with density *** initial phase is characterized by a density-velocity differential,resulting in a thicker,coarser sediment layer at the flow front,while the upper layers are thinner and finer in grain *** the mid-phase,slidin

关键词： fine-grained sedimentation density flow mode flume simulation experiments reservoir characteristics Chang 7_(3)sub-member Triassic Yanchang Formation shale oil Ordos Basin

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Research on Cementing Technology in Narrow Gaps at Changqing gas Field 13th

Research on Cementing Technology in Narrow Gaps at Changqing...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Duan, Zhi-Feng Lu, Hong-Jun Xie, Yong-Gang Ou, Yan-Yong Zhou, Yu Xie, Jiang-Feng National Engineering Laboratory for Low Permeability Oil and Gas Field Exploration and Development Beijing China Oil and Gas Technology Research Institute Changqing Oilfield CNPC Beijing China

ISBN: (纸本)9789819702558

As a typical "three-lows" characteristic of low permeability, low pressure, and low abundance, the Changqing gas field has been developed from straight and directional wells to horizontal wells. And the poor effectiveness of the lateral sealing is due to the application of casing without cementing completions or bare borehole completions. To ensure the quality of cementing with a small annular space gap, a mechanical coupling model of "casing-cement sheath-formation" was established, and mechanical simulations were conducted for both pressurized and unpressurized conditions under alternating stress to determine the performance of the required cement slurry. Then toughened materials were optimized to develop a high-toughness cement slurry and high-performance front liquid system with high flexibility and impact resistance. Subsequently, simulations were conducted in small borehole wells to improve replacement efficiency and optimize construction displacements. A series of process technologies for cementing long horizontal sections under narrow gap conditions was formed by optimizing conducting replacement efficiency simulations and construction displacements in small boreholes. It has been fully promoted and applied to achieve the renewal of the well-completion method. The initial daily gas production was increased by 25% compared with the bare-hole completion wells through the late production evaluation of the block. It has achieved the purpose of improving single well production and wellbore integrity, which is an important reference for unconventional small borehole cementing and effectively contributes to the development of the Changqing gas field. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Efficiency

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Parameter Design Optimization and Practice of Alkaline - Free Compound Flooding in Ordos low permeability Reservoir 13th

Parameter Design Optimization and Practice of Alkaline - Fre...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Shangguan, Yang-Nan Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi’an China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields Xi’an China

ISBN: (纸本)9789819702633

Jurassic reservoirs in Ordos are typical low permeability reservoirs. After years of waterflooding development, most of them have entered the middle and high water cut stage, and the comprehensive water cut has reached more than 66%, but the recovery degree is less than 30%. Compared with other compound flooding test areas of petrochina, it is difficult to carry out alkali-free compound flooding in Jurassic low permeability reservoirs in Changqing because of low permeability, strong heterogeneity, and higher salinity of formation water and injection water. Therefore, it is necessary to carry out injection experiments of polymer with different molecular weights to establish an injection chart suitable for Changqing oilfield. By using numerical simulation method, the main controlling factors that affect the combined flooding effect are injection/production ratio and polymer adsorption capacity. Field tests show that the effective laws of chemical flooding in low permeability reservoirs are different from those in medium and high permeability reservoirs. The analysis shows that the key factors to enhance oil recovery by chemical flooding in low permeability reservoirs are to keep the chemical injection continuously, to adjust the injection well and to maintain the reasonable formation pressure. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： low permeability reservoirs

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A Method for Determining the Water Drive Front by Using the Effective Utilization Ratio of Water Injection 9th

A Method for Determining the Water Drive Front by Using the ...

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9th International Conference on Water Resource and Environment, WRE 2023

作者： Wang, Siyi Tan, Xiqun Wang, Jing Yu, Xueiying Wang, Bin National Engineering Laboratory for Low Permeability Oil and Gas Field Exploration and Development Xi’an710018 China Changqing Oilfield Exploration and Development Research Institute Xi’an710018 China

ISBN: (纸本)9789819709472

In view of the problems of water flooding contradiction, water flooding efficiency decreasing year by year and inaccurate prediction of water flooding scope after low permeability reservoir entering the stage of middle and high water cut, the method of determining the water flooding front position of water injection well is studied in depth, the mathematical model is established and combined with well test data to accurately calculate the position of water drive front in different time periods in each direction of well group, considering non-darcy and water injection efficiency, the mathematical model is modified and perfected, and finally verified by inspection well group data. The results show that this method is more accurate and practical, and can accurately evaluate the utilization of water injection, accurately predict the range and direction of water flooding, it can effectively guide the study of water drive law, water injection optimization adjustment and remaining oil tapping potential. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Efficiency

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Physical Simulation Study on Horizontal Well Injection and Production in Ultra-low permeability Reservoirs 13th

Physical Simulation Study on Horizontal Well Injection and P...

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13th International Field exploration and development Conference, IFEDC 2023

作者： Li, Hong-Chang Wang, Jing Wang, Si-Yi Yang, Huan-Ying Wei, Ming-Xia Lu, Xue-Jiao Li, De-Sheng Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi’an China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields Xi’an China

ISBN: (纸本)9789819702633

In order to study the displacement mechanism between horizontal well fractures, seepage law, and the impact of horizontal well renovation parameters on development effectiveness, a large-scale outcrop rock sample physical simulation test was established. Based on the actual conditions of the oil reservoir, model parameters were designed to study the percolation mechanism of inter fracture displacement, the influence of fracture parameters and injection parameters on development effectiveness, and the influence of three displacement media tests: inter fracture water drive, natural gas drive, and surfactant drive on development effectiveness. This experiment revealed the displacement mechanism, seepage law, pressure change process, and production performance characteristics between horizontal wells in ultra-low permeability reservoirs. The experimental results indicate that: ① Physical model tests can effectively simulate the seepage law during the injection and production process of horizontal wells in ultra-low permeability reservoirs. ② Horizontal well fracture displacement is more likely to form linear displacement and improve oil recovery efficiency of the reservoir The horizontal well injection line has a well spacing of 200 m, a crack spacing of 156 m, and a half crack length of 178 m, resulting in the highest recovery rate. ④ The injection pressure is limited to the rupture pressure, and the higher the displacement pressure, the higher the recovery degree. ⑤ The final recovery rate of water flooding between fractures is the highest, and the recovery rate of natural gas and surfactant flooding between fractures is lower than that of water flooding between fractures. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Floods

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