大排量压裂组合粒径支撑剂铺置效果研究  

Placement effect of large-displacement fracturing combined particle size proppant

作　　者：闫琦睿 蒋建方 刘搏[1,2] 褚占宇 刘金栋 YAN Qirui;JIANG Jianfang;LIU Bo;CHU Zhanyu;LIU Jindong(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《石油地质与工程》2024年第6期112-119,共8页Petroleum Geology and Engineering

基　　金：国家科技重大专项课题“低渗-致密油藏高效提高采收率新技术”(2017ZX05009-004)。

摘　　要：非常规油气开发常使用大液量、大排量压裂技术,为解决常规加砂工艺难以对复杂水力裂缝形成有效支撑的问题,设计了大型可视化分支缝系统输砂模拟装置,开展高排量条件下组合粒径支撑剂在不同注入顺序和不同配比情况下的主裂缝和分支缝内铺置形态模拟实验,分析裂缝内砂堤形成规律和加砂工艺对支撑剂铺置效果的影响。实验结果表明,大粒径支撑剂只适用于主裂缝的支撑,小粒径支撑剂则更容易被输送到次级裂缝中形成砂堤;支撑剂按照粒径由小到大注入的铺置效果优于由大到小注入的铺置效果,还可以减少不同粒径支撑剂混层的产生;通过控制不同粒径支撑剂的注入时间比,既能兼顾主裂缝和分支缝形成有效支撑,又能优化裂缝的导流能力。现场对6口井按照优化后的设计方案进行了压裂施工及压后效果评价,压裂工艺成功率达100%,压后6个月平均单井增油839 t,并持续有效。该研究为现场加砂工艺设计提供了理论支持,提高了压裂加砂的成功率。Unconventional oil and gas development often uses large liquid volume and large-displacement fracturing technology.In order to solve the problem of conventional sand adding technology being difficult to support complex hydraulic fractures,a large visualization branch fracture system sand transportation simulation device was designed.The simulation experiments of the combined particle size proppants in the main fracture and branch fracture under different injection sequences and different proportions under the condition of large displacement were carried out.The formation rule of sand bank in fracture and the influence of sand addition technology on proppant placement were analyzed.The results show that large particle size proppant is only suitable for the support of the main fractures,while small particle size proppant is more easily transported to the secondary fractures to form the sand bank.The placement effect of proppant injection according to particle size from small to large is better than that of injection method from large to small,and it can also reduce the generation of mixed layers of proppant with different particle sizes.By controlling the injection time ratio of proppant with different particle sizes,effective support can be formed in both main fractures and branch fractures,and the conductivity of fractures can be optimized.According to the optimized design scheme,fracturing construction and post-pressure effect evaluation were carried out on site for 6 wells.The success rate of fracturing process reached 100%,and the average oil gain per well in 6 months after pressure was 839 t,which was continuously effective.This study provides theoretical support for on-site sand addition process design and improves the success rate of fracturing sand addition.

关 键 词：组合支撑剂 铺置规律 大排量压裂 分支缝 砂堤 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]