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井间示踪技术求地层参数和剩余油饱和度

期刊名称：油田化学，2007，（01）
时间：0
分类：TE357.8[石油与天然气工程—油气田开发工程] TE327[石油与天然气工程—油气田开发工程]
作者机构：[1]教育部提高油气采收率重点实验室（大庆石油学院）,黑龙江大庆163318, [2]大庆石油学院计算机科学与工程学院,黑龙江大庆163318
相关基金：国家自然科学基金重点项目“低渗透油层提高驱油效率的机理研究”（项目编号50634020）部分研究成果.
相关项目：低渗透油层提高驱油效率的机理研究

关键词：示踪剂, 井间示踪剂测试, 简化数学模型, 地层参数, 剩余油饱和度, 硫氰酸铵, 正丁醇, 大庆油田, tracers , interwell tracer test , simplified mathematical model , reservoir parameters , residual oil saturation , ammonium thiocyanate , normal butyl alcohol , Daqing oil fields

中文摘要：

常规三维两相非分配示踪剂、分配示踪剂问题的数学模型,其水组分和油组分方程中含有未知量Cww（水组分在水相中的浓度）和Coo（油组分在油相中的浓度）,在对基本模型差分求解时会增加很大的计算量。考虑到Cww≈1,Coo≈1,故令Cww=1,Coo=1,可将水组分和油组分方程简化。给出了该简化模型的隐式差分格式,并用高斯-塞德尔迭代法进行了求解。通过合理设计差分格,使得到的线性方程组系数矩阵严格对角占优,可使求解无条件稳定。与非简化模型计算结果相比,各井地层渗透率误差在2%以内,厚度误差在5%以内,表明简化模型运算精度能够满足要求。在大庆油田南二区N2-2-P38井组进行了该模型的实例应用。试验区注入硫氰酸铵10 t,正丁醇14 t。测得了周围3口油井的采出浓度曲线（另1口油井对应油层未射孔,没有检测到示踪剂）。根据N2-D3-P38、N2-D2-P38和N2-2-P138 3口生产井硫氰酸铵浓度峰值出现时间（152、225和42天）,计算得到注入水沿3口油井方向上的流速（1.65、1.11和5.95 m/d）,进而得到3个方向的平均水相渗透率（0.090、0.0731和0.477μm^2）。通过对含水、产液、压力等动态参数和示踪剂产出曲线的拟合,得到了该井组4个沉积单元（葡I1、葡I2、葡I3、葡I4）的地层参数场和剩余油饱和度分布。图4表1参6

英文摘要：

In the mathematical model of conventional three-dimensional two-phase non-distributive and distributive tracers problems, the concentration of water component in water phase Cww, and the concentration of oil component in oil phase Coo are unknown in the water and the oil component functions, which would cause massive calculations to solve difference equations in the basic model. Given Cww≈1 and Coo≈1, the water and the oil component functions can be simplified through substituting Cww = 1 and Coo = 1. The implicit difference schemes of this simplified model are presented and solved by using Gauss-Seidd iteration method. The coefficient matrix of the linear equations is diagonally dominant when the difference schemes designed reasonably. Compared with the results of the original model, the reservoir permeability errors are within 2 % and the layer thickness errors are within 5 % for all wells tested, which indicates the satisfactory accuracy of this simplified model. The model has been put into practical use for the well group N2-2- P38 in southern district Ⅱ in Daqing Oilfield. 10 tons of ammonium thiocyanate and 14 tons of normal butyl alcohol are injected in the pilot. The tracers production curves have been measurred in three nearby production wells besides of one not perforated and tracers are not detected. From the occurrence time of the peak value of ammonium thiocyanate production, 152, 225,and 42 days, the flowing velocity of injected water between the injection and the production wells, 1.65,1.11, and 5.95 m/d, and the average water-phase permeability of the reservoir 0. 090,0. 0731, and 0. 477 μm^2, are calculated and determined for production wells N2-D3-P38, N2-D2-P38, and N2-2-P138,respectivdy. By matching dynamic parameters such as water cut, fluid production, pressure, and tracer productiun curves, the reservoir parameters and remaining oil saturation distribution of the 4 sediments, namely, PI1, PI2, PI3, and PI4, are obtained.

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