濮城油田注入水体积流量实验特征

为了解注水过程中储层岩石特性的变化情况,在室内进行了现场注入水体积流量实验。根据注入不同孔隙体积倍数汪入水时岩样渗透率的变化,评价了注入水的敏感性。实验结果表明:濮城油田储层岩石在大量注入水冲刷下,会导致渗透率降低。受岩石胶结程度和渗透性影响,注入水孔隙体积倍数与渗透率变化曲线出现坐椅型、直线型和凸型等3种类型。空气渗透率越低,注入水的体积敏感程度越大。

西峰油田长8低渗储层注水困难的室内实验研究

针对西峰油田长8特低渗储层注水井注水效果不好,欠注严重的实际情况,通过开展体积流量评价实验、岩心X衍射分析、地层水杂质及地层驱出物X衍射分析和地层注入水(加药水)的水质分析等项室内静态和动态实验,初步确定西峰油田注水困难的主要原因是岩心中的粘土含量较高,遇水膨胀和一些胶结不实的非粘土颗粒,在流体的作用下发生运移,堵塞了孔喉。该实验研究为西峰油田今后注水开发过程中的降压增注和制定相应的开发技术对策提供了理论依据和技术支持。

Improved Correlation for the Volume of Bubble Formed in Air-Water System

In order to address the bubble formation and movement in air-water two-phase flow,single bubble rising in stagnant water is experimentally studied by digital image processing.Bubbles are released individually from the submerged orifices with different diameters(1.81 mm,2.07 mm,2.98 mm,3.92 mm)at different detachment frequency.Images are recorded by a high-speed video camera and processed by digital image processing technique. The factors impacting the formed volume of bubble are discussed.The experimental results showed that a threshold of gas flow rate(400 mm 3 ·s- 1)divides the bubble formation into two regimes:the constant volume regime and the growing volume regime.Especially for the growing volume regime,the surface tension is taken into account.The bubble volume is consisted of two parts:the surface tension impacting part and the gas volume flow rate impacting part.An improved correlation for bubble volume prediction is developed for the two regimes and better coincidence with the experiment data than the previous models is obtained.