南堡油田注多元热流体吞吐水平井加热效果评价

以南堡35-2油田稠油油藏为研究对象,针对多元热流体吞吐水平井加热半径沿程分布计算问题,通过两相渗流理论,利用保角变换方法,建立了加热半径沿程分布计算模型.研究了水平段井筒温度、加热半径沿程分布规律和不同注汽参数对加热效果的影响.研究表明,井筒温度和加热半径沿程分布呈"U"型;利用渗流力学方法计算的加热半径较油藏工程方法计算结果更符合实际.B31H井注汽参数优化表明,加热半径随非凝结气含量增加先增加后降低;随注汽速度增加基本不变;随周期注汽量增加先迅速增加后增加缓慢.该模型对准确评价注汽后加热效果及后期预测产能具有重要意义.

Evaluation of Heating Effect on the Horizontal Well in 35-2 Bohai Oilfield with Multiple Thermal Fluid Stimulation

Focusing on the heavy oil reservoir of 35-2 Bohai oilfield,based on the two phase percolation theory,the calculation model of the heating radius distribution is established by using the conformal transformation method.The effects of several parameters on heating efficiency are studied.It is found that the temperature and the heating radius distribute along the well are "U" typed.The calculation results of the heating radius calculated by the percolation mechanics method are more precise than the reservoir engineering method.The parameter optimization shows: the heating radius increases first then decreases with the increase of non-condensing gas content;the heating radius keeps stable asthe steam injection speeds up;the heating radius increases quickly first then slows down with the increase of steam injection volume.The model is of great significance to the heating effect evaluation and productivity analysis.