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特低渗透砂岩平板大模型井网适应性评价
肖前华1, 杨正明1, 徐轩2, 田文博1, 张亚蒲2
1.中国科学院渗流流体力学研究所,河北 廊坊 065007;2.中国石油勘探开发研究院廊坊分院,河北 廊坊 065007
摘要:
一维柱塞岩心和二维填砂模型很难模拟油藏储层的井网渗流,因此提出天然砂岩露头大模型制作方法以及定义两个参数用以评价特低渗透砂岩平板大模型井网适应性。利用天然砂岩露头制作平板大模型,模拟了不同井网在较均质储层中的生产状况。提出了有效压力波及系数和产能指数的概念。实验测定了各井网模型在不同注采压差下的平面压力梯度场,并在此基础上结合平行小岩样的非线性渗流曲线将模型渗流区域划分为不可流动区域、非线性渗流区域和拟线性渗流区域。研究表明,在较均质特低渗透储层渗流中,正方形反九点井网的适应性优于菱形反九点井网,优于矩形井网,随着注采压差的提高各井网模型的产能指数逐渐升高,不可流动区域逐渐减少,拟线性渗流区域逐渐增大,正方形反九点井网的非线性渗流区域呈下降趋势,菱形反九点井网和矩形井网的非线性渗流区域出现波动,表现为先上升后下降的趋势。
关键词:  低渗透油藏  天然砂岩露头  平板大模型  井网适应性  压力梯度  有效压力波及系数  产能指数
DOI:10.11835/j.issn.1000-582X.2013.09.005
分类号:
基金项目:国家油气重大专项(2011ZX05013-006)
Experimental study on adaptability of well pattern using sandstone plate model with ultra-low permeability
XIAO Qianhua1, YANG Zhengming1,2, XU Xuan2, TIAN Wenbo1, ZHANG Yapu2
1.Research Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences,Langfang,Hebei 065007,China;2.Langfang Branch,Petro China Research Institute of Petroleum Exploration and Development,Langfang,Hebei 065007,China
Abstract:
Because the porous flow state is difficult to be simulated by one-dimensional cores and two-dimensional sand filled models,this paper proposes a method of making large-scale natural outcrop flat model and defines two parameters to evaluate adaptability of different well pattern on the ultra-low permeability sandstone flat model. With natural sandstone plate model,production of different well patterns in homogeneous oil reservoirs is simulated. A concept of pressure sweep efficiency and deliverability index for researches on adaptability of well patterns are put forward. Through experiments,plane pressure gradient field of different well patterns under different drawdown pressures are measured,and then seepage areas of the models are divided into immobilized seepage area,nonlinear seepage area,and quasi-linear seepage area,with the help of small core nonlinear seepage curve. Experiments show that adaptability of inverted nine-spot equilateral well pattern is better than those of inverted nine-spot rhombus well pattern and rectangular well pattern. With the increase of drawdown pressure,deliverability index of all well patterns increases,immobilized seepage area reduces,and quasi-linear seepage area expands. At the same time,nonlinear seepage area of inverted nine-spot equilateral well pattern reduces,while those of inverted nine-spot rhombus well pattern and rectangular well pattern fluctuate as expanding first and then reducing.
Key words:  low permeability reservoirs  natural sandstone outcrops  large-scale plate model  adaptability of well pattern  pressure gradient  pressure sweep efficiency  deliverability index
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