摘要
针对水平井在多元热流体吞吐过程中发生气体窜流问题,采用半衰期保留率、表面张力变化率和填充砂管驱替实验,进行了泡沫封堵汽窜,提高热采效果研究。结果表明,优选后的起泡剂在300℃恒温24 h后泡沫半衰期2 798 s,保留率98.52%,表面张力38.54 mN/m,变化率4.89%;最佳使用浓度为0.3%,在150℃~250℃下的阻力因子≥40,可提高驱替效率14.49%;平行双管实验中泡沫使低渗、高渗岩心管的采收率分别提高12.21%和10.13%。现场注热过程中伴注4个段塞起泡剂,每个段塞可提高注入压力,生产未受注热井影响,热采有效期316d,增油3 116m^3。
For steam channeling happened in horizontal well during multiple thermal fluids huff and puff,the effects of foam profile on plugging channeling and enhancing thermal recovery were investigated by half-life period retention rate,surface tension variation gradient and sand-packed tube displacement test. The results indicated that after 24 hours under constant 300℃ the foam half-life period was 2798 s and retention rate was 98. 52%,surface tension was 38. 54 mN/m and variation gradient was 4. 89%. The optimized forming agent concentration was 0. 3%,which could improve the displacement efficiency by 14. 49% and resistance factor was ≥40 during 150℃~ 250℃. In parallel sand-packed tube displacement test,foam improved displacement efficiency of low permeability and high permeability cores by 12. 21% and 10. 13% respectively. Four slugs of foaming agent were injected in layer along with multiple thermal fluids during steam injection process. Each slug could improve injection pressure 0. 8 ~ 1. 5 MPa. Oil production was not affected by thermal injector well. The hermal recovery was effective for 316 days and increased oil production 3116m^3.
出处
《钻采工艺》
CAS
北大核心
2017年第1期102-104,共3页
Drilling & Production Technology
基金
中海油服油田生产事业部"多轮次注热调堵工艺技术研究"生产项目
关键词
稠油热采
多元热流体
耐高温起泡剂
阻力因子
heavy-oil thermal recovery
multiple thermal fluids
heat-resistant foaming agent
resistance factor
