CN108395885A - 一种疏松砂岩稠油油藏防砂用携砂液 - Google Patents
一种疏松砂岩稠油油藏防砂用携砂液 Download PDFInfo
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Abstract
本发明公开了一种疏松砂岩稠油油藏防砂用携砂液,具有降粘、增油、低伤害、防水敏、抑制粘土膨胀、携砂能力强等优点,由以下重量份的组分组成:0.45%~0.6%的携砂液主剂,1%~2%的清洗剂,3%~5%的粘土稳定剂,0.5%~1.5%的水伤害处理剂,余量为水。本发明的携砂液,携砂液主剂溶于水后,支链伸展形成空间网状结构,提高携砂能力;其中的极性基团能快速渗进稠油,通过增溶、分散、破坏稠油结构、改变组分含量等作用,降低稠油粘度,提高流动性,改善油藏开发效果。应用本发明的携砂液可以提高防砂施工成功率与防砂有效期,降低稠油粘度,改善稠油注汽开发效果。
Description
技术领域
本发明涉及一种疏松砂岩稠油油藏防砂用携砂液,属于疏松砂岩稠油油藏防砂技术领域。
背景技术
疏松砂岩稠油油藏由于油层结构疏松,胶结性能差,油藏泥质含量高,导致出砂严重。同时,稠油热采导致地层充填带外亏空,砂粒反复运移,新井投产前和生产过程中需要进行防砂。防砂技术已成为疏松砂岩稠油油藏开发基础工艺,对油田持续稳产发挥着关键作用。目前主要采用复合防砂、挤压充填防砂等工艺,均需要进行地层挤压充填,防止地层出砂。
地层挤压充填时需采用携砂液将充填砂带入地层。目前主要采用羟丙基瓜胶携砂液,但该携砂液存在剪切降解、返排率低、存在水敏伤害、残留高导致储层伤害、防砂后油井产量下降等缺点。此外,还缺乏对稠油油藏的针对性,存在以下不足之处:1)稠油粘度高,采用瓜胶携砂液进行地层挤压充填时容易形成砂桥,导致充填不密实;2)大量携砂液液体挤入地层,导致后续注汽开采效率降低;3)携砂液遇高温流变性能发生变化,携砂能力下降,无法实现高砂比充填。
发明内容
针对上述现有技术,本发明提供了一种疏松砂岩稠油油藏防砂用携砂液,其适用于疏松砂岩稠油油藏防砂,具有降粘、增油、低伤害、防水敏、抑制粘土膨胀、携砂能力强等优点。
本发明是通过以下技术方案实现的:
一种疏松砂岩稠油油藏防砂用携砂液,由以下重量份的组分组成:0.45%~0.6%的携砂液主剂,1%~2%的清洗剂,3%~5%的粘土稳定剂,0.5%~1.5%的水伤害处理剂,余量为水。
优选的,由以下重量份的组分组成:0.5%的携砂液主剂,1.5%的清洗剂,4%的粘土稳定剂,1.0%的水伤害处理剂,余量为水。
所述携砂液主剂为丙烯酰胺-聚醚丙烯酸酯-正丁烯磺酸钠共聚物(该聚合物,由丙烯酰胺、聚醚丙烯酸酯、正丁烯磺酸钠聚合而成,可通过常规的方法制备得到),其化学结构式如下所示:
其中,a为1000~1500之间的整数,b,c均为800~1200之间的整数,m为400~800之间的整数。
所述清洗剂选自十六烷基苯磺酸钠,十二烷基苯磺酸钠。
所述粘土稳定剂为无机稳定剂和季铵化聚醚胺的复配物,所述无机稳定剂选自NH4Cl、KCl;所述季铵化聚醚胺可常规市场购买得到,也可购自胜利油田胜利化工有限公司的SLFP-G1;所述无机稳定剂和聚醚胺的重量比为2~3:1。
所述水伤害处理剂选自月桂酸单乙醇酰胺,油酸二乙醇酰胺。
所述疏松砂岩稠油油藏防砂用携砂液的制备方法为:将各组分混合混匀,即得。
本发明的疏松砂岩稠油油藏防砂用携砂液,携砂液主剂溶于水后,支链伸展形成空间网状结构,提高携砂能力;其中的极性基团能快速渗进稠油,通过增溶、分散、破坏稠油结构、改变组分含量等作用,降低稠油粘度,提高流动性,改善油藏开发效果;清洗剂对稠油中的胶质、沥青质组分及泥饼有较好的分散作用,为挤压充填建立通道,提高充填密实度;粘土稳定剂所含的多个极性基团吸附在砂粒、泥质表面,抑制粉细砂、泥质运移,提高防砂有效期;水伤害处理剂依靠高表面活性,降低油水界面张力,减少渗流阻力,增大油井产能。应用本发明的携砂液可以提高防砂施工成功率与防砂有效期,降低稠油粘度,改善稠油注汽开发效果。
与现有技术相比,本发明具有如下优点:
1、一剂多效:本发明的携砂液在提高携砂能力的同时,能降低稠油粘度,改善稠油油藏开发效果,增加产油量。
2、防砂效果好:本发明的携砂液耐剪切,耐高温,携砂能力强,此外,粘土稳定剂有效抑制粉细砂、粘土运移,清洗剂提高挤压充填通道渗流能力,充填密实,提高了防砂有效期。
3、低伤害:本发明的携砂液无残留,解决水敏问题,对储层无伤害。
4、适用范围广:本发明的携砂液用于常规开采稠油油藏,可以提高水驱开发效果;用于注蒸汽热采时,可以降低注汽压力,提高注汽质量,改善开发效果。
附图说明
图1:携砂液对两口油井原油的降粘效果示意图;
图2:采用本发明的携砂液进行挤压充填防砂后油井生产曲线示意图。
具体实施方式
下面结合实施例对本发明作进一步的说明。
下述实施例中所涉及的仪器、试剂、材料等,若无特别说明,均为现有技术中已有的常规仪器、试剂、材料等,可通过正规商业途径获得。下述实施例中所涉及的实验方法,检测方法等,若无特别说明,均为现有技术中已有的常规实验方法,检测方法等。
实施例1制备疏松砂岩稠油油藏防砂用携砂液
组分组成为:0.5%的携砂液主剂,1.5%的清洗剂,4%的粘土稳定剂,1.0%的水伤害处理剂,余量为水。
所述携砂液主剂为丙烯酰胺-聚醚丙烯酸酯-正丁烯磺酸钠共聚物(由丙烯酰胺、聚醚丙烯酸酯、正丁烯磺酸钠通过常规方法聚合得到),其中,a为1000~1200之间的整数,b,c均为800~1000之间的整数,m为400~600之间的整数。
所述清洗剂为十六烷基苯磺酸钠。
所述粘土稳定剂为无机稳定剂和季铵化聚醚胺的复配物,所述无机稳定剂为NH4Cl;所述季铵化聚醚胺为购自胜利油田胜利化工有限公司的SLFP-G1(下同);所述无机稳定剂和聚醚胺的重量比为2.5:1。
所述水伤害处理剂为月桂酸单乙醇酰胺。
制备方法为:将各组分混合混匀,即得。
实施例2制备疏松砂岩稠油油藏防砂用携砂液
组分组成为:0.45%的携砂液主剂,2%的清洗剂,3%的粘土稳定剂,1.5%的水伤害处理剂,余量为水。
所述携砂液主剂为丙烯酰胺-聚醚丙烯酸酯-正丁烯磺酸钠共聚物(由丙烯酰胺、聚醚丙烯酸酯、正丁烯磺酸钠通过常规方法聚合得到),其中,a为1200~1500之间的整数,b,c均为1000~1200之间的整数,m为600~800之间的整数。
所述清洗剂为十二烷基苯磺酸钠。
所述粘土稳定剂为无机稳定剂和季铵化聚醚胺的复配物,所述无机稳定剂选自NH4Cl、KCl;所述无机稳定剂和聚醚胺的重量比为2:1。
所述水伤害处理剂为油酸二乙醇酰胺。
制备方法为:将各组分混合混匀,即得。
实施例3制备疏松砂岩稠油油藏防砂用携砂液
组分组成为:0.6%的携砂液主剂,1%的清洗剂,5%的粘土稳定剂,0.5%的水伤害处理剂,余量为水。
所述携砂液主剂为丙烯酰胺-聚醚丙烯酸酯-正丁烯磺酸钠共聚物(由丙烯酰胺、聚醚丙烯酸酯、正丁烯磺酸钠通过常规方法聚合得到),其中,a为1000~1200之间的整数,b,c均为800~1000之间的整数,m为400~600之间的整数。
所述清洗剂为十六烷基苯磺酸钠。
所述粘土稳定剂为无机稳定剂和季铵化聚醚胺的复配物,所述无机稳定剂为KCl;所述无机稳定剂和聚醚胺的重量比为3:1。
所述水伤害处理剂为月桂酸单乙醇酰胺。
制备方法为:将各组分混合混匀,即得。
实验1携砂能力实验
分别量取6份500mL配置好的携砂液(实施例1制备)倒入同速混调器中,保持搅拌器恒速转动,分别按10%、20%、30%、40%、50%、75%的体积比加入充填砂,搅拌5min,把含充填砂的携砂液分别倒入6个1000ML量筒中,观察充填砂在携砂液中的分散效果并记录充填砂全部沉降至量筒底部所需时间。结果见表1。
从表1中可以看出,不同含量的充填砂在该携砂液中的沉降时间都达到了3min以上,且分散良好,无聚团现象,说明该携砂液具有较好的悬砂能力,能够满足挤压充填防砂施工要求。
表1不同含量充填砂在携砂液中的沉降时间
实例1
在50℃条件下,用DV-III布氏粘度仪测新春采油厂2口井:某油井1、某油井2原油粘度,分别为2985mPa.S,3240mPa.S。称取不同量的携砂液(实施例1制备)分别加入到100g上述两油井的油水混合物中,使携砂液主剂有效浓度分别为200、400、600、1000、1200mg/L,在50℃下搅拌均匀,测试粘度变化。
图1为不同携砂液加量下稠油粘度变化(图中,1代表某油井1,2代表某油井2),从图中看出,温度50℃时,携砂液中携砂液主剂有效浓度为200~400mg/L条件下,原油粘度从3000mPa.S左右降至200mPa.S以下,室内条件下降粘率达95%以上。
实例2
某油井油层厚度:8.5m,渗透率:451.0×10-3um,孔隙度:26.7%,泥质含量:13.5%,50℃原油粘度3027.6mPa.S,出砂严重,含有大量泥质、粉细沙,无法正常生产。前期采用瓜胶携砂液进行挤压充填防砂,投产后产量衰减快,注汽转周时间短,油气比低,防砂有效期短。
2014年6月,利用本发明的携砂液(实施例1制备)进行挤压充填防砂,共用携砂液75m3,带入充填砂19m3。目前已正常生产超过700天,油气比提高到1.28(如图2所示)。可见,利用本发明的携砂液对注蒸汽开采稠油油藏进行挤压充填防砂,在显著延长防砂有效期的同时,提高了注汽质量与蒸汽利用效率,降低了稠油粘度,改善了开发效果。
上述虽然结合实施例对本发明的具体实施方式进行了描述,但并非对本发明保护范围的限制,所属领域技术人员应该明白,在本发明的技术方案的基础上,本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。
Claims (3)
1.一种疏松砂岩稠油油藏防砂用携砂液,其特征在于:由以下重量份的组分组成:0.45%~0.6%的携砂液主剂,1%~2%的清洗剂,3%~5%的粘土稳定剂,0.5%~1.5%的水伤害处理剂,余量为水;
所述携砂液主剂为丙烯酰胺-聚醚丙烯酸酯-正丁烯磺酸钠共聚物,其化学结构式如下所示:
其中,a为1000~1500之间的整数,b,c均为800~1200之间的整数,m未500~800之间的整数;
所述清洗剂选自十六烷基苯磺酸钠,十二烷基苯磺酸钠;
所述粘土稳定剂为无机稳定剂和季铵化聚醚胺的复配物,所述无机稳定剂选自NH4Cl、KCl;
所述无机稳定剂和季铵化聚醚胺的重量比为2~3:1;
所述水伤害处理剂选自月桂酸单乙醇酰胺,油酸二乙醇酰胺。
2.根据权利要求1所述的疏松砂岩稠油油藏防砂用携砂液,其特征在于:由以下重量份的组分组成:0.5%的携砂液主剂,1.5%的清洗剂,4%的粘土稳定剂,1.0%的水伤害处理剂,余量为水。
3.权利要求1或2所述的疏松砂岩稠油油藏防砂用携砂液的制备方法,其特征在于:将各组分混合混匀,即得。
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