致密油层体积压裂排量优化方法  

Optimization of pumping rate for volume fracturing of tight reservoir

作　　者：樊凤玲[1] 李宪文[1] 曹宗熊[1] 王蓓[1] 彭娇[2] 周德胜[2] 

机构地区：[1]长庆油田分公司油气工艺研究院,陕西西安710021 [2]西安石油大学石油工程学院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2014年第3期79-82,10,共4页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省科技统筹创新工程计划项目"陆相页岩气储层压裂改造工艺技术攻关"(编号:2012KTZB03-03-03-02);国家自然科学基金项目"气井气体携液的多液滴理论研究(编号:51074124)

摘　　要：在离散化缝网模型(DFN)基础上,结合油井及地层的相关参数,利用缝网模拟软件模拟了裂缝在地层主平面上的拟三维离散化扩展和支撑剂在缝网中的分布,数值求解了不同压裂排量改造后的缝网半长、带宽、次生裂缝条数和储层改造体积(SRV)等缝网几何形态参数,给出了简单高效的排量优化方法。以鄂尔多斯一口油井为例,模拟结果表明:压裂排量不是越大越利于复杂缝网形成,模拟的离散缝网几何形态参数会随压裂排量的增大先快速增大后趋于平缓,以SRV为评价改造效果的主要参数,综合其他参数变化特征,可以优选出致密油层体积压裂的施工排量。Based on discrete fracture network( DFN) model and the basic parameters of oil well and tight reservoir,the pseudo-3D propagation of the fractures on principal plane and the distribution of proppant in the fractures are stimulated using fracture network stimulation software,and the width,the half length,the induced fracture number and the stimulated reservoir volume( SRV) of the fracture network under different pumping rates are determined using numerical algorithm,which offers a simple and efficient approach to obtain the optimal pumping rate for the volume fracturing of tight reservoir. The volume fracturing simulation of an oil well in Ordos Basin shows that,the large volume fracturing pumping rate is not necessarily conducive to the formation of the complex fracture network,and the geometrical parameters of the simulation fracture network increase rapidly firstly and then slowly with the increase of the volume fracturing pumping rate. Meanwhile,the pumping rate for volume fracturing of tight reservoir can be optimized by taking SRV as evaluation parameter of stimulation result under considering the characteristics of other geometrical parameters.

关 键 词：致密油层 体积压裂 离散化缝网模型 排量优化 储层改造体积 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]