大庆萨南油田南二区西部聚驱初期特征

通过对萨南油田南二区西部聚驱初期见效特征进行分析研究 ,讨论了南二区西部聚驱区块的主要见效特点 ,并从油层沉积构造、调整措施等方面入手 ,对影响聚驱开发效果的因素以及改善聚驱开发效果的方法进行了探讨、论证 ,从而寻找适合油层发育相对较差、断层构造发育的油田提高聚驱开发效果的有效手段 。

不同二类油层水驱及聚驱驱替规律研究

总结萨北开发区二类油层水驱与聚驱规律,为编制开发方案提供依据,进行了室内水驱、聚驱实验。实验按常规驱油实验步骤进行,首先水驱至含水率98%,然后开始转注聚至不出油。实验结果表明,在水驱段,萨尔图组和高台子组二类油层的水驱采收率均与有效渗透率呈正相关关系,其水驱开发指标预测也皆可沿用一类油层的水驱驱替特征曲线方法;相同渗透率下,萨尔图层的水驱采收率要高于高台子层,说明其油层物性更好。在聚驱段,在相同渗透率,以及水驱后注入相同相对分子质量、相同浓度的聚合物溶液的条件下,高台子组的二类油层岩心两端压差变化更加明显,而萨尔图油层注聚量小于高台子层。萨尔图组和高台子组二类油层的采收率在半对数坐标系下均与水油比呈二次函数关系,可以用此关系预测萨尔图组和高台子组二类油层的聚驱开发指标。

海上油田稀井网大井距聚合物驱应用与分析

为改善海上X油田产量递减现状,在室内评价及小井组试验的基础上,进行了中高含水期的早期聚合物驱矿场试验,提出了海上油田注入井分层分质注入、分层调剖,油井提液引效的措施。研究表明,稀井网大井距聚合物驱主要以扩大平面波及体积为主;从边部油井的见效特征分析可知,聚合物注入可有效压制边水入侵,但对改善纵向层间矛盾效果有限。X油田早期聚合物驱试验为海上同类油田的开发提供了重要参考依据。

Characteristics of resistivity log response of oil layers under polymer flooding

Resistivity log responses are different when the oil layers is filled by a polymer solution or water and it seriously affects the log interpretation of the water flooded layer. In this paper, we first analyze the electrical properties of the polymer solution. Then, according to the different processes for polymer flooding the reservoir, we perform rock resistivity experiments and analyze the rock resistivity variations in different displacement phases. We also compare the resistivity log responses of oil layers filled with the polymer solution to those filled with water. The results show that when displacing the oil-bearing core by different polymers, the resistivity changes monotonously decrease and show either ＂W＂ type or ＂S＂ type. The resistivity log responses are weak when displacing water and there is no flooded show if the oil layer is injected by a fresh water polymer solution. If the oil layer is injected by a sewage polymer solution, the resistivity log response has similar characteristic as a polluted water flooded layer.