海拉尔油田混注纤维压裂技术

Fracturing by blending fiber in Hailar Oilfield

针对海拉尔油田贝301区块储层欠压严重,压裂施工过程中近井地带大部分支撑剂回流,造成裂缝部分或完全闭合,影响油井压裂效果问题,利用纤维具有物理稳固、可形成空间网状结构的特性,开展了碳纤维防砂技术室内实验及现场试验。研究表明,混注纤维压裂技术,即将碳纤维直接加入到压裂液中是可行的。对比防砂效果,碳纤维与包裹陶粒相近,但碳纤维除具有防砂作用还能够提高压裂液悬砂性能,改善裂缝铺砂剖面、提高改造效果。本次研究对海拉尔油田欠压储层改造提供了技术支撑,为国内相关油田相似储层的压裂改造提供了借鉴。

Reservoirs in Bei 301 Block of Hailar Oilfield have problem of most proppant near wellbore flowing back during fracturing process and fractures close partially or entirely.Carbon fiber sand control technique is tested both in laboratory and on site by making advantage of fiber that is physically stable and can form spatial net structure.The study shows that the technique of fracturing by blending fiber,i.e.directly blending carbon fiber into fracturing fluid,is feasible.Carbon fiber has similar sand control effect with encapsulated ceramsite,moreover,it can improve sand suspension property of fracturing fluid,fracture conductivity,and stimulation result.This study provides technical support to reservoir stimulation in Hailar Oilfield and can be referred to for fracturing in similar reservoirs.