摘要
大庆油田进入开发后期,外围低渗透扶杨油层已成为大庆油田的主力油层。针对难采储量,应用大规模多级缝网压裂工艺可以提高单井产量。目前大庆油田普遍采用阶梯式滑套结构的压裂管柱,滑套孔径逐级减小,能量在管柱滑套变径处产生节流损失,限制了排量的提升。为解决多级变径节流损失问题,提出了全通径大规模多级压裂管柱并研制了全通径导喷封隔器。通过计算节流损失,确定了合理内通径尺寸,可以实现大排量施工;应用ABAQUS有限元软件对胶筒与套管之间接触应力模拟分析,确保密封能力;通过室内油浸试验,验证了该封隔器的耐温、承压指标以及耐疲劳次数。该封隔器现场应用4口井,层施工成功率100%,标志着全通径压裂工艺技术可以应用现场,提高施工规模及施工效率,实现大排量缝网压裂施工。
After Daqing Oilfield entered its late development stage, peripheral Fuyang Formation having low permeability has become the primary target for oil production in Daqing Oilfield. Large-scale multi-stage fracturing techniques have been deployed to enhance productivity of individual wells to develop hardly reachable reserves. Currently, fracturing strings with staged slide-sleeve structures are used extensively in Daqing Oilfield. However the decrease of slide sleeves in diameter usually results in chocking energy loss around joints, potentially restricting discharging capacity. To eliminate energy loss related to pipe strings with reduced diameters, full-sized multi-stage diverting packers for fracturing stimulation have been developed, and by calculating chocking loss, proper diameters can be determined to achieve the maximum discharging capacity. ABAQUS finite-element software was applied to simulate and analyze contact stress among rubber barrel and casing to achieve desirable sealing performances. Laboratory oil immersion experiments confirmed the temperature resistance, pressure resistance and fatigue performances of these packers. By now they have been deployed in 4 wells, delivering a success rate of 100%. This indicates that the innovative full-sized fracturing technology is practicable for large-scale fracturing stimulation with high capacity and efficiency.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2016年第5期705-708,共4页
Oil Drilling & Production Technology
关键词
全通径
封隔器
大排量
多级压裂
full-size
packer
high capacity
multi-stage fracturing
