边底水油藏化学驱提高采收率实验研究
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摘要
为探索冀东油田高浅南油藏化学驱提高采收率技术,研制适应油藏条件的驱油用表面活性剂,利用均质岩心模型和3层非均质岩心模型开展化学驱驱油实验,对该油藏化学驱提高采收率的可行性进行综合评价。实验结果表明:研制的表面活性剂降低油水间界面张力的能力较强,浓度为0.3%时油水界面张力即可达到10~(-3)mN/m数量级,拥有很强的提高驱油效率的能力;该表面活性剂对高浅南油藏具有较好的驱油效果,可在水驱基础上继续提高采收率15.00个百分点。研究认为,对于冀东油田高浅南油藏,采用单一表面活性剂驱采收率提高幅度较小,而采用调剖堵水+表面活性剂驱技术对提高采收率有明显效果。建议对于非均质性较弱的油藏,提高采收率应以提高驱油效率为主,对于非均质性较强的油藏,提高采收率应以提高波及效率为先。该研究结果对同类油藏提高采收率具有一定的借鉴意义。
In order to explore enhanced oil recovery technology by chemical flooding in Gaoqiannan reservoir of Jidong Oilfield,a surfactant for oil displacement adapted to reservoir conditions is developed,chemical flooding experiments are carried out by using homogeneous core model and 3 layer heterogeneous core model,and the feasibility of enhancing recovery by chemical flooding is comprehensively evaluated. Experimental results show that: the of developed surfactant has strong ability to reduce the interfacial tension between oil and water,when the concentration is 0. 3%,the interfacial tension can reach 10~(-3) mN/m orders of magnitude,which display a very strong enhanced oil recovery efficiency; this surfactant has good oil displacement effect for Gaoqiannan reservoir,and can increase the recovery by 15 percentage points on the basis of water flooding. Research shows that for the Gaoqiannan reservoir in Jidong Oilfield,the recovery was increased slightly with single surfactant flooding,while profile control and water shutoff + surfactant flooding technology has obvious effect on enhancing oil recovery. It is suggested that,for the reservoir with weak heterogeneity,to improve the recovery rate should be mainly to improve oil displacement efficiency,and for the reservoir with strong heterogeneity,mainly to improve sweep efficiency first. The research results have certain significance to improve the recovery of similar reservoirs.
In order to explore enhanced oil recovery technology by chemical flooding in Gaoqiannan reservoir of Jidong Oilfield,a surfactant for oil displacement adapted to reservoir conditions is developed,chemical flooding experiments are carried out by using homogeneous core model and 3 layer heterogeneous core model,and the feasibility of enhancing recovery by chemical flooding is comprehensively evaluated. Experimental results show that: the of developed surfactant has strong ability to reduce the interfacial tension between oil and water,when the concentration is 0. 3%,the interfacial tension can reach 10~(-3) mN/m orders of magnitude,which display a very strong enhanced oil recovery efficiency; this surfactant has good oil displacement effect for Gaoqiannan reservoir,and can increase the recovery by 15 percentage points on the basis of water flooding. Research shows that for the Gaoqiannan reservoir in Jidong Oilfield,the recovery was increased slightly with single surfactant flooding,while profile control and water shutoff + surfactant flooding technology has obvious effect on enhancing oil recovery. It is suggested that,for the reservoir with weak heterogeneity,to improve the recovery rate should be mainly to improve oil displacement efficiency,and for the reservoir with strong heterogeneity,mainly to improve sweep efficiency first. The research results have certain significance to improve the recovery of similar reservoirs.
引文
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[2]李海东,刘道杰,崔建,等.高浅南区复杂小断块油藏特高含水期剩余油分布规律研究[J].石油地质与工程,2014,28(4):74-76,155-156.
[3]伍晓林,张国印,刘庆梅,等.石油羧酸盐的研制及其在三次采油中的应用[J].油气地质与采收率,2001,8(1):62-63.
[4]胡钶.山东胜利油田孤岛东区改性羧酸盐驱油技术经济评价[D].北京:中国地质大学(北京),2010.
[5]刘欣.木质素嵌段聚醚及羧酸盐表面活性剂的合成及性能研究[D].北京:中国林业科学研究院,2009.
[6]张树彪,乔卫红,王绍辉,等.改性木质素磺酸盐与石油磺酸盐的复配研究[J].大连理工大学学报,2000,40(3):297-300.
[7]向育君,徐伟箭,夏新年,等.木质素磺酸盐研究及其主要应用最新进展[J].高分子通报,2010,23(9):99-104.
[8]王立成,曹绪龙,宋新旺,等.磺酸盐与非离子表面活性剂协同作用的研究[J].油田化学,2012,29(3):312-316,330.
[9]丁振军.表面活性剂的复配及应用性能研究[D].无锡:江南大学,2007.
[10]杨承志.化学驱油过程中表面活性剂损失的机理及抑制途径Ⅱ.抑制方法[J].油田化学,1985,2(2):145-154.
[11]谭中良,韩冬,杨普华.孪连表面活性剂的性质和三次采油中应用前景[J].油田化学,2003,20(2):187-191.
[12]谭中良,韩冬,杨普华.孪连表面活性剂的分子结构研究新进展[J].精细石油化工进展,2003,4(12):20-22,26.
[13]肖进新,罗妙宣,吴树森.孪连表面活性剂[J].自然杂志,1997,19(6):335-338.
[14]钮贤鹏.生物表面活性剂驱油评价及现场应用的研究[D].长春:吉林大学,2012.
[15]刘晨,王业飞,于海洋,等.低渗透油藏表面活性剂驱油体系的室内研究[J].石油与天然气化工,2011,40(5):486-489,498.
[16]李玥洋,蒲万芬,孟令俊,等.表面活性剂驱油藏适应性研究[J].新疆石油地质,2012,33(1):75-79.