Title

Experimental study of improved sweep efficiency by surfactant?鄄polymer flooding

作者

杨阳刘慧卿庞占喜陈庆元林士尧张兆祥陈一鹤刘继伟4

单位

1．中国石油大学（北京）石油工程教育部重点实验室，北京102249 2．中国石油大港油田分公司勘探事业部，天津　300270

3．中国石油厄瓜多尔安第斯公司，北京　100007 4．中国石化河南油田分公司采油二厂，河南南阳　473132

Organization

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Exploration Department, Dagang Oilfield Company, PetroChina, Tianjin 300２７0, China Ecuador Andes Oilfield Company, PetroChina, Beijing 10000７, China No.2 Oil Production Plant, Henan Oilfield Company, SINOPEC, Nanyang 473132, China

摘要

二元复合驱提高采收率技术在稠油油藏中应用广泛，而波及效率是影响采收率的重要因素之一，但之前在研究提高采收率时能定量描述波及效率的却很少。文中基于普通稠油油藏，根据贝克莱￣列维尔特驱油理论（B￣L理论）以及含水率与含水饱和度关系，推导出一维条件下提高波及效率的理论公式，利用一维物理模拟实验，探究波及效率的3个影响因素，即流度比、非均质性、界面张力。结果表明：聚合物黏度越大，流度比越小，提高波及效率越好；非均质性显著影响二元复合驱波及效率；界面张力对二元复合驱的波及效率几乎无影响，但是由于界面张力对驱油效率影响很大，其数量级应在 10-6 N/m。在物模实验结果基础上，提出一种聚合物￣表面活性剂二元复合驱提高波及体积的数学模型。数值模拟验证结果表明，该模型拟合程度较高，与实际现场预测对比，该模型虽存在误差，但能起到一定的预测指导作用。

Abstract

Surfactant-polymer displacement system is widely used to enhance oil recovery in heavy oil reservoir. Sweep efficiency is one of the important factors that enhance oil recovery, but very few scholars have studied it quantitatively. Based on surfactant-polymer displacement system for heavy oil reservoir, considering water cut and saturation, the 1D sweep efficiency formula is deducted. Three factors of expanding sweep efficiency such as mobility ratio, heterogeneity, interfacial tension, have been studied. The result indicates that the greater the viscosity of polymer is, the smaller the mobility ratio is, the better sweep efficiency is;heterogeneity affects sweep efficiency;interfacial tension has little effect on sweep efficiency, but it does have great effect on oil displacement efficiency; the order of magnitude of the interfacial tension is preferably around E-6 N/m. Based on the physical model experiment, a mathematical model of improving sweep efficiency by surfactant-polymer displacement system is established, and the results are verified by numerical simulation. Comparing with the in-situ tests, the error of mathematical model is small and it can play a role in forecasting.

关键词：

稠油油藏; 聚￣表二元复合驱; 波及效率; 数学模型;

Keywords:

heavy oil reservoir; surfactant?鄄polymer displacement system; sweep efficiency; mathematical model;

DOI

10.6056/dkyqt201502026

二元复合驱提高波及效率的实验研究