低渗透油藏超前注水单井产能影响因素

Affecting factors of single well production with leading injection in the low permeability reservoir

应用数值模拟方法研究了注水时间、渗透率、井距、地层压力因数对低渗透油藏超前注水效果的影响.结果表明:超前注水可提高驱动压差,减小压敏效应对低渗透油藏开发的不利影响;超前注水时渗透率低的油井产能下降幅度小,具有较好增油效果;超前注水需选择合理注采井距,井距过大、过小均不能取得最佳驱油效果;正常压力及异常低压油藏适合超前注水,异常高压低渗透油藏建议采用滞后注水开采.

In this paper,the research was made about the effect of injection time,permeability,injector producer distance and pressure coefficient on the leading injection in the low permeability reservoir.The result showed that leading injection could enhance the driving pressure differential and decrease the adverse effect of pressure sensitivity on the development of the low permeability reservoir.Leading injection showed a good effect on enhancing oil production.Proper injector producer intervals are inportant.Optimum displacement result could not be achieved when the distance was too big or too small.Good result of leading injection could be achieved in the normal and subnormal pressure reservoir,while in the surer pressure and low permeability reservoir,delayed injection should be adopted.