泾河油田裂缝型致密油藏地质特征及开发对策
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摘要
在阐述裂缝致密油藏地质及开发动态特征的基础上,明确了开发难点,并提出开发对策,可为同类型油田开发提供借鉴。泾河油田储层致密、孔喉细小、连通性差、可动流体百分数低,发育构造和水平层理裂缝,裂缝是高产主控因素。储层可划分为4类,Ⅰ、Ⅱ类为"甜点",非均质性强、厚度薄、孔隙度低、含油饱和度低、储量丰度低;油井产量低、产能差异大、产量递减快、累产低、采收率低,开发难度大。开发难点主要有"甜点"精细描述难度大、提高井控储量难度大、提高采收率难度大、能量补充难度大等。针对开发难点,提出了"非连续"性井位部署、水平井分段压裂、滚动建产、优化油藏工程参数、能量补充先导试验、实施低成本战略等6项开发对策。
Based on the geological characteristics and the development perspectives, this paper discusses the challenges in the exploration of fractured tight oil reservoirs, and proposes strategies for the development of their exploitation. The work, based on results from the Jinghe Oilfield, provides a reference for the development of oil fields of the same type. The Jinghe oil field is a dense reservoir with fine pore structure, poor connectivity, and a low percentage of movable fluids. Such structure, as well as the horizontal layered fractures, are the main factors controlling the yield of the reservoir. The reservoirs can be divided into four types, among which types I and Ⅱ are"sweet spots", and are characterized by a strong heterogeneity, low thickness, low porosity, low oil saturation, and low abundance. The wells have a low production, large difference in the production capacity,rapid decline in the production, low cumulative production, and low recovery capability. It is highly difficult to economically develop the reservoir. The issues in its development include the difficulty in accurately locating the"sweet spots", improving the controllable reserves, improving the recovery rate, and in performing energy injection. Six development strategies are proposed, to address the development difficulties specifically, namely: a"discontinuous"well location deployment, a segmental fracturing of horizontal wells, a rolling construction and production, the optimization of reservoir engineering parameters, the implementation of pilot tests for energy injection, and the implementation of low-cost procedures.
Based on the geological characteristics and the development perspectives, this paper discusses the challenges in the exploration of fractured tight oil reservoirs, and proposes strategies for the development of their exploitation. The work, based on results from the Jinghe Oilfield, provides a reference for the development of oil fields of the same type. The Jinghe oil field is a dense reservoir with fine pore structure, poor connectivity, and a low percentage of movable fluids. Such structure, as well as the horizontal layered fractures, are the main factors controlling the yield of the reservoir. The reservoirs can be divided into four types, among which types I and Ⅱ are"sweet spots", and are characterized by a strong heterogeneity, low thickness, low porosity, low oil saturation, and low abundance. The wells have a low production, large difference in the production capacity,rapid decline in the production, low cumulative production, and low recovery capability. It is highly difficult to economically develop the reservoir. The issues in its development include the difficulty in accurately locating the"sweet spots", improving the controllable reserves, improving the recovery rate, and in performing energy injection. Six development strategies are proposed, to address the development difficulties specifically, namely: a"discontinuous"well location deployment, a segmental fracturing of horizontal wells, a rolling construction and production, the optimization of reservoir engineering parameters, the implementation of pilot tests for energy injection, and the implementation of low-cost procedures.
引文
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[7]张小菊,邓虎成,毕钰,等.水平井剖面天然裂缝响应特征及识别方法研究——以泾河油田17井区长8油藏致密砂岩储层为例[J].石油地质与工程,2016, 30(4):88-91. doi:10.3969/j.issn.1673-8217.2016.04,024ZHANG Xiaoju, DENG Hucheng, BI Yu, et al. Natural fracture response characteristics and its identification methods of horizontal wells:A case study of Chang-8sandstone reservoir in well Block-17 of Jinghe Oilfiled[J].Petroleum Geology and Engineering, 2016, 30(4):88-91.doi:10.3969/j.issn.1673-8217.2016.04.024
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[12]冷先刚,孙卫,解伟,等.西峰油田庄58井区长81储层出水原因[J].断块油气田,2009, 16(2):89-91.LENG Xiangang, SUN Wei, XIE Wei, et al. Causation of water producing for Chang 81 low permeability reservoir in Block Zhuang 58 of Xifeng Oilfield[J]. Fault-Block Oil&Gas Field, 2009, 16(2):89-91.
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