高温静态渗吸实验技术在三塘湖油田注水吞吐机理研究中的应用——以NJH、M56区块基质岩心为例

USING HIGH TEMPERATURE SPONTANEOUS IMBIBITION EXPERIMENT TECHNOLOGY TO STUDY OIL RECOVERY MECHANISM OF WATERFLOOD HUFF AND PUFF IN STH OILFIELD:A CASE FROM MATRIX CORE IN BLOCK NJH AND M56

渗吸实验作为注水吞吐提高采收率技术驱油机理实验,对油田注水吞吐措施参数优化提供数据支持。通过设计两组渗吸实验,分别研究了三塘湖油田NJH区块砂岩、M56区块凝灰岩渗吸规律,并针对M56区块凝灰岩进行了压力、含油饱和度、油水黏度比、表面活性剂等渗吸影响因素研究。实验表明:直径为2.5cm,长度大于直径1.5倍的小直径岩心在渗吸初、中、后期呈现明显规律:渗吸初期渗吸速度快,渗吸中期渗吸速度减慢,渗吸后期渗吸速度趋于零,渗吸达到平衡。渗吸采收率的增长趋势也是由快至慢的过程。而不同渗吸影响因素实验因子的设计结果表明:压力、含油饱和度、油水黏度比、表面活性剂等因素对渗吸采收率及渗吸时间都有不同程度的影响。

As an oil displacement mechanism experiment of water-flood huff and puff technology to improve oil recovery efficiency, the imbibition experiment provides data support for parameter optimization of water injection huff and puff measures. Two groups of imbibition experiments were designed to study the imbibition law of sand- stone in Block NJH and the imbibition law of tuff in Block M56 in STH oilfield. The studies on influence factors of imbibition such as pressure, oil saturation, oil and water viscosity ratio, and surfactants are carried out for tuff of Block M56. The experiment shows that a small diameter core with a diameter of 2.5cm and a length greater than 1.5 times the diameter shows obvious regularity in the initial, middle and later period of imbibition. At the initial stage of imbibition, the imbibition velocity is fast, the mid-term imbibition velocity of imbibition is slow, the imbibition velocity tends to zero at the later stage of imbibition, and the imbibition reaches the balance. The growth trend of imbibition recovery is also from fast to slow. The experimental factors of different imbibition influence factors show that pressure, oil saturation, oil and water viscosity ratio, surface active agent and other factors have different influence on the imbibition recovery and imbibition time.