渤海油田多轮次层内生成CO_2调驱效果优化
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摘要
为解决渤海油田多轮次层内生成CO_2调驱后增油效果逐渐变差的问题,通过岩心驱替实验分析了其原因,并对比了不同封堵体系对调驱效果的改善作用。研究表明:1轮次层内生成CO_2调驱可使原油采出程度在水驱基础上提高25.61百分点,2轮次调驱采出程度在1轮次基础上仅提高0.38百分点,3轮次调驱已无增油效果;在3轮次调驱前注入0.2 PV的聚合物,增油效果提高不明显,而注入同样体积的凝胶体系,采出程度比只进行3轮次层内生成CO_2调驱提高10.19百分点,表明凝胶体系能够有效封堵高渗层,使后续层内生成CO_2调驱溶液转向低渗层,从而显著改善多轮次层内生成CO_2调驱效果。研究结果为在渤海油田强非均质性储层开展多轮次层内生成CO_2调驱提供了参考依据。
In order to solve the problem that oil increase effect gradually decreases after multi-round profile control of in-situ carbon dioxide generation in Bohai Oilfield, core flooding experiments were conducted to analyze reasons for poor performance of multiround profile control of in-situ carbon dioxide generation. The effects of different plugging systems on control flooding were studied.The results show that the recovery rate of first-round flooding can be increased by 25.61% on the basis of water flooding, and the recovery rate of second-round flooding can be increased by 0.38% on the basis of first-round. Third round of flooding has no effect.0.2 PV polymer injected before the third round of in-situ carbon dioxide generation shows no significant change in the effect of oil increase. 0.2 PV gel system injected before the third round of in-situ carbon dioxide generation will improve the recovery rate by 10.19% on the basis of second-round, which indicates that gel system can effectively block the hypertonic layer and turn the subsequent reagent solution into the low permeability layer. Thus multi-round profile control effect of in-situ carbon dioxide generation can be significantly improved. The results of the study provide a reference for multi-round profile control of in-situ carbon dioxide generation in strong heterogeneous reservoirs of Bohai Oilfield.
In order to solve the problem that oil increase effect gradually decreases after multi-round profile control of in-situ carbon dioxide generation in Bohai Oilfield, core flooding experiments were conducted to analyze reasons for poor performance of multiround profile control of in-situ carbon dioxide generation. The effects of different plugging systems on control flooding were studied.The results show that the recovery rate of first-round flooding can be increased by 25.61% on the basis of water flooding, and the recovery rate of second-round flooding can be increased by 0.38% on the basis of first-round. Third round of flooding has no effect.0.2 PV polymer injected before the third round of in-situ carbon dioxide generation shows no significant change in the effect of oil increase. 0.2 PV gel system injected before the third round of in-situ carbon dioxide generation will improve the recovery rate by 10.19% on the basis of second-round, which indicates that gel system can effectively block the hypertonic layer and turn the subsequent reagent solution into the low permeability layer. Thus multi-round profile control effect of in-situ carbon dioxide generation can be significantly improved. The results of the study provide a reference for multi-round profile control of in-situ carbon dioxide generation in strong heterogeneous reservoirs of Bohai Oilfield.
引文
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[3]谢晓庆,康晓东,张贤松,等.海上稠油油田化学驱潜力评价方法及其应用[J].中国海上油气,2016,28(1):69-74.
[4]高尚,张璐,刘义刚,等.渤海油田聚驱受效井液气交注复合深部解堵工艺[J].石油钻采工艺,2017,39(3):375-381.
[5]张云宝,薛宝庆,卢祥国.渤海油田多轮次凝胶调驱参数优化实验研究:以LD5-2油田A22井为例[J].石油与天然气化工,2015,44(4):87-92.
[6]李翔.渤海氮气泡沫段塞调驱研究与应用[J].海洋石油,2012,32(1):57-60.
[7]张浩,李廷礼,贾晓飞,等.海上稠油油田层间干扰变化研究[J].断块油气田,2015,22(5):656-659.
[8]梁守成,吕鑫,李强,等.渤海S油田窜流通道封堵技术[J].油田化学,2017,34(1):53-57.
[9]苏保卫,王铎,高学理,等.海上采油水处理技术的研究进展[J].中国给水排水,2009,25(24):31-35.
[10]林波,蒲万芬,赵金洲,等.利用就地CO_2技术提高原油采收率[J].石油学报,2007,28(2):98-101.
[11]张博,徐景亮,李翔,等.层内生成CO_2技术提高采收率机理研究及应用[J].西安石油大学学报(自然科学版),2017,32(3):94-99.
[12]王松.层内自生CO_2泡沫调驱技术实验研究[D].成都:西南石油大学,2017.
[13]SERNAGUERRERO R,DA′NA R,SAYARI A.New insights into the interactions of CO_2with amine-functionalized silica[J].Ind.Eng.Chem.Res.,2008,47(23):9406-9412.
[14]ALTUNINA L K,KUVSHINOV V A,RODIONOVA N I,et al.Effect of temperature on thiocarbamide isomerization in concentrated aqueous solutions[J].Russian Journal of Applied Chemistry,2011,84(6):993-996.
[15]汤勇,汪勇,邓建华,等.自生CO_2结合表面活性剂复合吞吐数值模拟[J].西南石油大学学报(自然科学版),2013,35(4):107-113.
[16]张光焰,张金国,张云芝,等.利用自生气的油气田开发开采工艺技术概况[J].油田化学,2007,24(3):272-276.
[17]王飞,李兆敏,李松岩,等.自生热泡沫体系在多孔介质中协同作用机制[J].中国石油大学学报(自然科学版),2016,40(3):130-135.
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