Whole-life cycle countermeasures to improve the stimulation effect of network fracturing in deep shale gas reservoirs of the Southern Sichuan Basin

被引：0
|
作者：
Shen C. [1 ]
Xie J. [2 ]
Zhao J. [3 ]
Fan Y. [4 ]
Ren L. [3 ]
机构：
[1] Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu
[2] CNPC Planning Department, Beijing
[3] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu
[4] Engineering Technology Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu
来源：
Natural Gas Industry | 2021年 / 41卷 / 01期
关键词：
Close cluster spacing; Deep shale gas; Integrated fracturing scheme design; Liquid's proppant carrying efficiency; Long horizontal section; Network fracturing; Southern Sichuan Basin; Tridimensional fracturing; Whole life cycle;
D O I：
10.3787/j.issn.1000-0976.2021.01.015
中图分类号：
学科分类号：
摘要：
In order to realize scale efficient development of deep shale gas, this paper systematically analyzes the geological and engineering factors influencing the stimulation effect of network fracturing in shale reservoirs in the whole life cycle of shale gas well covering well location deployment, drilling & completion and production by taking the deep shale gas reservoir of Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in the Luzhou-Yuxi Block of the southern Sichuan Basin as the research object. Then, corresponding technological countermeasures and the next development direction were pointed out. And the following research results were obtained. First, stress state and fault system are the principal factors influencing the propagation degree of fracture networks, unequal-timing target and its drilling rate are the prerequisite to the formation of complex fracture networks, the developed natural weak plane zone is an important medium to induce fracture propagation, and the thickness of high-quality shale reservoir is the geological basis for evaluating vertical resource development capacity. Second, liquid carrying efficiency and close cluster spacing are the technological guarantee to improve the complexity of hydraulic fractures, finest aged perforation technology is the core technology to realize the lateral reservoir development sufficiently, integrated fracturing scheme design is an innovative process to avoid the occurrence of complex downhole situations and maximize reservoir stimulation effect, and reasonable well soaking and production system is the necessary measure to ensure a long-term stable production of gas wells at a high level. Third, the connotation of the whole-life cycle countermeasures to improve the stimulation effect of network fracturing for deep shale gas wells includes establishing a suitable vertical and lateral reservoir development pattern to stimulate the high-quality reservoirs sufficiently, effectively identifying faults and weak planes to reduce the occurrence of complex borehole situations, optimizing cluster spacing and sand fluid systems to maximize the scale of hydraulic fracture networks, and formulating a rational production system to reach the maximum estimated ultimate recovery (EUR) of gas wells. Fourth, the next development direction of network fracturing technology for deep shale gas reservoirs include carrying out fine fracturing scheme design of gas wells with long horizontal sections, continuously optimizing sand fluid systems, cluster spacing and construction intensity, and researching multilayer tridimensional fracturing technology. © 2021, Natural Gas Industry Journal Agency. All right reserved.
引用
收藏
页码：169 / 177
页数：8
相关论文
共 27 条
  • [1] SHEN Cheng, GUO Xingwu, CHEN Malin, Et al., Horizontal well fracturing stimulation technology for deep shale gas reservoirs, Natural Gas Industry, 39, 10, pp. 68-75, (2019)
  • [2] MA Xinhua, XIE Jun, The progress and prospects of shale gas exploration and exploitation in southern Sichuan Basin, SW China, Petroleum Exploration and Development, 45, 1, pp. 161-169, (2018)
  • [3] MA Xinhua, XIE Jun, YONG Rui, Et al., Geological characteristics and high production control factors of shale gas in Silurian Longmaxi Formation, southern Sichuan Basin, SW China, Petroleum Exploration and Development, 47, 5, pp. 841-855, (2020)
  • [4] YANG Hongzhi, ZHAO Shengxian, LIU Yong, Et al., Main controlling factors of enrichment and high-yield of deep shale gas in the Luzhou Block, southern Sichuan Basin, Natural Gas Industry, 39, 11, pp. 55-63, (2019)
  • [5] SHEN Cheng, XIE Jun, ZHAO Jinzhou, Et al., Evolution difference of fracability of marine shale gas reservoir in Luzhou and west Chongqing Block, Sichuan Basin, Journal of China University of Mining & Technology, 49, 4, pp. 736-748, (2020)
  • [6] ZHANG Chi, Optimization and application of deep gas well fracturing in Pingqiao Block of Fuling shale gas field, Lithologic Reservoirs, 30, 6, pp. 160-168, (2018)
  • [7] DUAN Hua, LI Heting, DAI Junqing, Et al., Horizontal well fracturing mode of "increasing net pressure, promoting network fracture and keeping conductivity" for the stimulation of deep shale gas reservoirs: A case study of the Dingshan area in SE Sichuan Basin, Natural Gas Industry, 39, 2, pp. 66-70, (2019)
  • [8] HE Zhiliang, NIE Haikuan, HU Dongfeng, Et al., Geological problems in the effective development of deep shale gas: A case study of Upper Ordovician Wufeng-Lower Silurian Longmaxi Formations in Sichuan Basin and its periphery, Acta Petrolei Sinica, 41, 4, pp. 379-391, (2020)
  • [9] JIANG Tingxue, BIAN Xiaobing, WANG Haitao, Et al., Volume fracturing of deep shale gas horizontal wells, Natural Gas Industry, 37, 1, pp. 90-96, (2017)
  • [10] ZENG Bo, WANG Xinghao, HUANG Haoyong, Et al., Key technology of volumetric fracturing in deep shale gas horizontal wells in southern Sichuan, Petroleum Drilling Techniques, 48, 5, pp. 77-84, (2020)
123