达尔其油田腾格尔组下段-阿二段低幅度油藏水力压裂适应性研究

Hydro-fracture Adaptability of the Low Amplitude Reservoir of K_1b_1~t-K_1b_1~a in Da'erqi Oilfield

白音查干凹陷所辖的达尔其油田是典型的低幅度复杂断块油藏,受储层物性制约,油井产量低,稳产时间短。为提高单井产能,在以往压裂的基础上,通过改变选井选层原则、优化压裂施工参数、考虑破裂压力与油藏的适应性以及压裂规模与井网的适应性,达到利用压裂形成的宽短缝有效提高储层的导流能力的目的,也为后期注水稳产开发提供了地质条件;同时探索出适合白音查干油藏特点的压裂参数,为同类油藏提高最终采收率提供了经验。采油井实施压裂后,增油效果明显。

Da'erqi Oilfield in Baiyinchagan Sag was a typical low amplitude complicated fault block reservoir and controlled by reservoir property,where oil output was low with short time of stable production in the wells.In order to improve the single well productivity,a new round of fracturing test was implemented based on the previous fracturing.Through the optimization to operational fracture parameter,the reservoir nature of low amplitude was taken into account to achieve the aim of effectively improving reservoir flow conductivity by utilizing wide and short fissure generated by fracturing,which provided geological condition for later stable water-flooding development.After the fracturing,the production capacity increases greatly.It provides experiences for enhancing ultimate oil recovery for similar reservoirs.It obtains good effect for oil increment.