高温高盐油藏调驱体系优选与先导性试验
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摘要
塔里木LN油田T1油层超深、高温、高矿化度油藏特点及层间矛盾突出,吸水差异性大,水窜现象严重,基于聚合物分子设计思路,利用深部调驱剂性能评价方法,制备和优选出适合高温高盐油藏特点的调驱体系。实验结果表明:优选出的高温微米级微球平均粒径为28μm,耐温达130℃,在125℃时膨胀倍数为3～5;体膨颗粒膨胀倍数在6～16之间;冻胶在125℃条件下,1年内未破胶脱水,注入体积达10PV时,注入压力保持率在85%以上;1PV调驱体系提高采收率幅度可达5%,含水率下降可达10%。先导性试验表明,注水压力显著提高、吸水能力大幅降低,高渗通道得到有效封堵,水窜得到控制,4井组累积增油1.7×10~4t,递减增油2.8×10~4t,增油降水效果明显。先导性试验的成功应用,标志着高温高盐油藏深剖调驱技术取得了重大突破,在同类油藏可广泛使用。
Due to the reasons of super deep, high temperature and high-salinity reservoir characteristics of the T1 reservoir of LN in Tarim oilfield, and serious interlayer contradiction, the significant difference of water absorp-tion, serious water channeling phenomenon, The selection and pilot test of Profile control system in high tempera-ture and high salinity reservoir was Carried out based the macromolecule design and the evaluation method of deep profile modification system. Experiment results showed that: expansion multiple of excellent elected high tempera-ture micron level micro-ball, average grain diameter of which was 28 μm,was 3 ～5 at 125℃ and the temperature resistance of micro-ball was up to 130℃;expansion multiple of swellable Particle e was 6～16;when the gel didn't broken at 125℃ among one year, and the injected volume was up to 10 PV, the seal blocking rate of micro-ball was up to 85% above;and the amplitude of enhanced oil recovery of 1 PV profile control system was up to 5%,and wa-ter-cut rate reduced by 10%.The in-depth profile control pilot test,which obtained an obvious stimulation and de-watering effect,showed that water injection pressure increased, water injectivity reduced, high permeability channel was plugged effectively, water breakthrough was obtained control, and the accumulation oil increment of 4 well groups reached 1.7×10~4 t, the decline oil increment reached 2.8×10~4 t.The successful application of Pilot Test marked the significant breakthrough of Profile Control System in High Temperature and High Salinity Reservoir,so which can be widely applied in Similar reservoir.
Due to the reasons of super deep, high temperature and high-salinity reservoir characteristics of the T1 reservoir of LN in Tarim oilfield, and serious interlayer contradiction, the significant difference of water absorp-tion, serious water channeling phenomenon, The selection and pilot test of Profile control system in high tempera-ture and high salinity reservoir was Carried out based the macromolecule design and the evaluation method of deep profile modification system. Experiment results showed that: expansion multiple of excellent elected high tempera-ture micron level micro-ball, average grain diameter of which was 28 μm,was 3 ～5 at 125℃ and the temperature resistance of micro-ball was up to 130℃;expansion multiple of swellable Particle e was 6～16;when the gel didn't broken at 125℃ among one year, and the injected volume was up to 10 PV, the seal blocking rate of micro-ball was up to 85% above;and the amplitude of enhanced oil recovery of 1 PV profile control system was up to 5%,and wa-ter-cut rate reduced by 10%.The in-depth profile control pilot test,which obtained an obvious stimulation and de-watering effect,showed that water injection pressure increased, water injectivity reduced, high permeability channel was plugged effectively, water breakthrough was obtained control, and the accumulation oil increment of 4 well groups reached 1.7×10~4 t, the decline oil increment reached 2.8×10~4 t.The successful application of Pilot Test marked the significant breakthrough of Profile Control System in High Temperature and High Salinity Reservoir,so which can be widely applied in Similar reservoir.
引文
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[3]江厚顺,叶翠,才程.新疆油田六中东区砾岩油藏深部调驱先导试验[J].特种油气藏,2012,19(3):132-135.
[4]周明,冯积累,江同文,等.塔里木油田高温高矿化度油藏三次采油初步研究[J].新疆石油地质,2010,31(2):163-166.
[5]马红卫,李宜坤,朱怀江,等.柔性转向剂作用机理及其先导试验[J].大庆石油地质与开发, 2008,27(4)92-94.
[6]朱怀江,王平美,刘强.一种适用于高温高盐油藏的柔性堵剂[J].石油勘探与开发,2007,34(2):230-233.
[7]梁伟,赵修太,韩有祥,等.驱油用耐温搞盐聚合物研究进展[J].特种油气藏,2010,17(2):11-14.
[8]何启平,施雷庭,郭智栋,等.适合高温高矿化度油藏的弱凝胶体系研究[J].钻采工艺,2011,34(2):79-82.
[9]武海燕,罗宪波,张廷山,等.深部调剖剂研究新进展[J].特种油气藏,2005,12(3):1-3.
[10]刘玉章,熊春明,罗健辉,等.高含水油田深部液流转向技术研究[J].油田化学,2006.23(4):248-251.