薄互层特低渗油藏联合井网与沉积相模式的适配性

doi:10.7657/XJPG20200212

摘要/Abstract

摘要：

薄互层特低渗透油藏储集层厚度小,物性差,采用压裂水平井-直井联合井网开发,能够提高单井产能和储集层动用程度,但由于受储集层非均质性和水力裂缝的影响,水平井极易过早见水,导致暴性水淹,带来开发风险,需设计合理的井网与裂缝的适配关系,以延长水平井生产寿命。以大庆油田某典型薄互层特低渗油藏为例,建立了考虑不同沉积相组合模式的水平井-直井联合井网精细油藏数值模型,采用复杂井和流线模拟技术,研究了压裂水平井分段动用情况,揭示了单裂缝分段产出规律与渗流特征。由于不同沉积模式储集层物性差异较大,压裂水平井含水率上升不再遵循均匀驱替规律,而是物性较好的河道相内驱替增强,物性较差的席状砂沉积相内驱替减弱。同时,水力裂缝的存在会导致流线转向,加速高渗通道的形成。为延缓高渗通道形成,进一步研究了典型沉积相组合模式与裂缝参数的优化配置,并提出了提高开发效果建议。

关键词: 薄互层储集层, 特低渗油藏, 水平井, 压裂, 联合井网, 流线模拟, 沉积相模式, 高渗通道

Abstract:

The thin interbedded, extra-low permeability reservoir is characterized by small thickness and poor physical properties and the application of a combined well pattern of vertical and horizontal wells can improve single well productivity and reservoir producing degree. But due to the impacts of reservoir heterogeneity and hydraulic fractures, it is very easy for water breakthrough in horizontal wells, which will result in serious watered out and bring risks to oilfield development. Therefore, a reasonable adaptability of well pattern and fracture should be designed to elongate the production life of horizontal wells. Taking a typical thin interbedded, extra-low permeability reservoir in Daqing oilfield as an example, the paper establishes a fine reservoir numerical model for the combined well pattern of vertical and horizontal wells, which considers different sedimentary facies assemblages. The paper also studies the staged producing status of the fractured horizontal well and reveals the staged production rule and flowing characteristics in single fracture. Because the physical properties of the reservoirs of different sedimentary models are greatly different, the rise of the water cut in the fractured horizontal well doesn’t follow the rules of uniform displacement. The displacement in the channel facies with relatively good physical properties is enhanced while weakened in the sheet sands with relatively poor physical properties. Meanwhile, the hydraulic fracture will lead to the change of streamline direction and speed up the formation of high-permeable paths. In order to delay the formation of the high-permeable paths, the paper further studies the optimum configuration of typical sedimentary facies model and fracture parameters and proposes some suggestions to improve development effect.

Key words: thin interbedded reservoir, extra-low permeability reservoir, horizontal well, fracturing, combined well pattern, streamline modeling, sedimentary facies model, high-permeable path

中图分类号:

TE341

张敏, 王文东, 高辉, 苏玉亮, 詹世远. 薄互层特低渗油藏联合井网与沉积相模式的适配性[J]. 新疆石油地质, 2020, 41(2): 209-216.

ZHANG Min, WANG Wendong, GAO Hui, SU Yuliang, ZHAN Shiyuan. Adaptability of Combined Well Pattern to Sedimentary Facies Model in Thin Interbedded, Extra-Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(2): 209-216.

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