特低渗储层降低渗流阻力改性注入剂研究与应用

Research and aplliacation of quality-changed injection agent to reduce the penetrate resistance of extro-low penetrability formation

长庆油田渗透率为0.3mD左右特低渗储层(长8)具有孔喉中值半径小(<0.1μm)、水驱压差高(15～30MPa)、见水前的平均采油速度小(<0.1mL·min-1),现场实际产能低(1.2t·d-1)、注水压力高(17～20MPa)等特点,为有效开发此类油田,经室内一系列的性能评价实验,确定最佳注入技术,研制出经济有效的降低注水流动阻力的BCD-08改性注入剂。室内实验结果表明,该剂可改善相渗特征,降低渗流阻力。长庆西峰油田注水地层(长8)现场试验结果表明,BCD-08可有效提高储层渗流能力,明显改善吸水剖面。

There are many characteristics for Extro-low permeability formation of Changqing Oilfield that penetrability is 0.3mD or so,such as small pore and spacing diameters （〈0.1um）,high expellant pressure （15- 30MPa）, low average recovery rate before water cut （〈0.1mL.min-1）, low ability of site production （1.2t.d-1）and high water injection pressure （17-20 MPa）.To effectively develop this reservoir a kind of quality-changed injection agent named BCD-08 has been made to reduce water injectin resistance and changed phase permeability character . The effection of field experiment used in Xifeng oifield of Changqing proved that the quality-changed injection agent named BCD-08 can effectively increase the formation permeability and adjust the water absorbing section of water injection well.