CN111793162A - 一种水驱井治理用双交联颗粒调堵剂 - Google Patents
一种水驱井治理用双交联颗粒调堵剂 Download PDFInfo
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Abstract
本发明涉及油田化学领域，提供一种水驱井治理用双交联颗粒调堵剂，为了有效控制水驱区块厚油层内低效无效循环，进一步挖潜剩余油，实现油藏深部调堵而研制。本发明按重量百分比由下列成分组成：8‑15%聚合物单体A和聚合物单体B共混物，1‑1.5%矿聚物纳米粒子，0.1‑0.5%引发剂，0.1‑0.5%交联剂，余量为水。本发明适用性良好，稳定性高，为低效无效循环厚油层内综合治理，提供了技术支持。
Description
技术领域
本发明涉及油田化学领域，提供一种水驱井治理用双交联颗粒调堵剂。
背景技术
目前，常规调驱体系会加剧层内颗粒溶孔，导致出现新的粒间孔窜流通道，造成产层内注采无效注采绕流问题突出，且传统聚合物颗粒在调堵过程存在交联密度过大，吸水性不足，过孔后难以保持原有结构强度，不利于深部油藏孔道封堵问题的有效解决。
本发明为决解上述问题，提供一种双交联颗粒调堵剂：吸水膨胀性良好、可恢复形变，在反复通过地层环境过程中，重复膨胀—压缩—再膨胀—再压缩的过程中，依然能够保弹性形变恢复能力，并保持颗粒固有强度，在达到深部油藏后仍然能够形成有效封堵，长期热稳定性水平高，可保证调剖后续可持续性效果。
发明内容
本发明的目的是提供了吸水膨胀性及支撑性良好，利于延长终膨周期，增加受效时间，抑制新的粒间孔窜流通道形成的一种水驱井治理用双交联颗粒调堵剂。
本发明的技术方案是通过以下措施来实现的：一种水驱井治理用双交联颗粒调堵剂，其按重量百分比由下列成分组成：8-15%聚合物单体A和聚合物单体B共混物，1-1.5%矿聚物纳米粒子，0.1-0.5%引发剂，0.1-0.5%交联剂，余量为水。
所述矿聚物纳米粒子为人造锂皂石Laponite。
所述聚合物单体A可以是丙烯酸、甲基丙烯酸、甲基丙磺酸中一种或任意几种的组合。
所述聚合物单体B可以是丙烯酰胺、甲基丙烯酰胺、丙烯腈中一种或任意几种的组合。
所述引发剂为水溶性无机类引发剂，可以是硝酸铈铵、2-酮戊二酸、过硫酸铵中一种或任意几种的组合。
所述交联剂为N，N’―亚甲基双丙烯酰胺、三烯丙基异氰脲酸酯中一种或二种的组合。
本发明的一种水驱井治理用双交联颗粒调堵剂，其作用原理如下：
从化学结构上来分析，双交联颗粒聚合物是分子中含有亲水性基团和疏水性基团的交联型高分子。一端的金属离子和水分子形成配位水合，含氧原子的负离子基团又通过氢键抓住另外一些水分子，而疏水端正好露在外侧，形成圈屏障。
此外体系中引入纳米黏土粒子Laponite，结构与天然蒙脱石类似，为2:1层状硅酸盐结构，在镁氧八面体的两边各有一个共用氧原子的硅氧四面体，其中部分二价的镁原子被一价锂原子置换，使粒子表面带有永久电荷。Laponite粒子的粒径具有单分散性，片层直径约25-30nm，厚度约1nm。Laponite不溶于水，但在水中片层剥离分散，形成无色透明的胶体分散液。由于片层表面带负电荷而边缘带正电荷，因此Laponite分散液经过一段时间的老化后会产生凝胶。
Laponite颗粒分散悬浮在水中，表面积很大。丙烯酰聚合物分子上的极性基团容易在Laponite颗粒表面发生吸附，形成一定的凝聚体。在单体聚合过程中，Laponite颗粒在聚合体系中均均分散，因其纳米结构表现出优异的触变性、分散性、悬浮性和增稠性，聚合物分子链间得到充分舒展，得到水凝胶颗粒体系表现出良好的吸水性以及弹性恢复能力。
本发明具有如下优点：
1）本发明终膨周期长，利于延长受效时间，为有效控制低效无效循环，进一步挖潜厚油层，提供技术支持；
2）本发明吸水膨胀性、支撑性良好，注入的同时可有效支撑地层结构界面，抑制新的粒间孔窜流通道形成，能对较大尺寸孔隙通道进行有效封堵；
3）本发明具有良好的力学性能和二次交联特性，相比与传统聚合物水膨胀颗粒，过孔后强度明显减弱，本发明通过颗粒内部的可逆的静电力和氢键的协同作用，使原本受力发生的形变再次恢复。
附图说明：图1 本发明实施例1中试样SHP-1吸水膨胀倍数曲线；图2 本发明实施例1中试样SHP-1（40天终膨）和SHP-1（40天终膨后45℃恒温浸泡180天）过孔压力变化曲线。
具体实施方式：下面结合实施例对本发明作进一步说明：一种水驱井治理用双交联颗粒调堵剂，其按重量百分比由下列成分组成：8-15%聚合物单体A和聚合物单体B共混物，1-1.5%矿聚物纳米粒子，0.1-0.5%引发剂，0.1-0.5%交联剂，余量为水。
所述矿聚物纳米粒子为人造锂皂石Laponite。
所述聚合物单体A可以是丙烯酸、甲基丙烯酸、甲基丙磺酸中一种或任意几种的组合。
所述聚合物单体B可以是丙烯酰胺、甲基丙烯酰胺、丙烯腈中一种或任意几种的组合。
所述引发剂为水溶性无机类引发剂，可以是硝酸铈铵、2-酮戊二酸、过硫酸铵中一种或任意几种的组合。
所述交联剂为N，N’―亚甲基双丙烯酰胺、三烯丙基异氰脲酸酯中一种或二种的组合。
实施例1，本实施例中试样SHP-1为双交联颗粒调堵剂，其按重量百分比由下列成分组成：
12%甲基丙烯酸、丙烯腈共混物，混合比2：1，
1.5%锂皂石粒子，
0.25%硝酸铈铵、过硫酸铵，混合比0.5：1，
0.35%N，N’―亚甲基双丙烯酰胺、三烯丙基异氰脲酸酯，混合比1：0.5，
余量为水。
其制备流程如下：
（1）在三口烧瓶中加入一定量超纯水，随后加入1.5%锂皂石粒子，抽真空，充氮气将装置中的氧气充分除去后，并用磁力搅拌器在氮气氛围下充分搅拌溶解；
（2）4h后在氮气保护下加入12%甲基丙烯酸、丙烯腈共混物，混合比2：1，继续搅拌约1h；
（3）再向上述溶液中依次加入0.25%硝酸铈铵、过硫酸铵，混合比0.5：1，不断搅拌溶液约1h；
（4）随后在上述溶液中加入0.35%N，N’―亚甲基双丙烯酰胺、三烯丙基异氰脲酸酯，混合比1：0.5，继续搅拌至完全溶解；
（5）将反应液转入塑料瓶中，封闭瓶口，接着在70℃的水浴条件下聚合3h；
（6）反应结束后取出高聚凝胶，用造粒机把聚合物剪碎成小片状，然后放入丙酮中浸泡过夜，最后产品在80℃下真空干燥12h。
实施例2，本实施例中本发明按重量百分比由下列成分组成：
8%丙烯酸，甲基丙烯酰胺共混物，混合比2：1，
1.0%锂皂石粒子，
0.1%硝酸铈铵，
0.5%N，N’―亚甲基双丙烯酰胺，
余量为水。
制备方法同实施例1。
实施例3，本实施例中本发明按重量百分比由下列成分组成：
15%丙烯酸、丙烯酰胺共混物，混合比2：1，
1.3%锂皂石粒子，
0.5%2-酮戊二酸、过硫酸铵，混合比0.5：1，
0.1%N，N’―亚甲基双丙烯酰胺，
余量为水。
制备方法同实施例1。
实施例4，本实施例给出了本发明的物性评价
1.吸水膨胀性能
试样SHP-1吸水膨胀性实验分析结果表明，本实施例中试样可实现终膨20倍以上，如表1所示：
表1 试样膨胀倍数
2.过孔强度
用量筒取50ml浸泡好的SHP-1颗粒样品（固液比大于9）放入颗粒参数测定仪中，安装上φ0.3mm孔板，调整装置使其密封，用计量泵以20ml/min速度驱动装置中的活塞容器，并注意观察装置下面由孔板内流出物质的状态；测量颗粒的通过0.3mm孔板的压力。
实验结果表明，40天终膨过孔强度在2.5MPa以上，45℃恒温浸泡180天过孔强度仍能保持在2.0MPa以上，得出压力曲线如图2所示。
3.封堵性能
对SHP-1颗粒样品的性能物理模拟评价，所用岩芯参数φ380* 45*45（mm）。对1000-4000mD渗透率范围内的方岩心进行颗粒的驱替封堵实验，实验结果表明，本实施例中所调堵剂其岩心封堵率在99%以上，实验数据如表2所示：
表2
Claims (6)
1.一种水驱井治理用双交联颗粒调堵剂，其特征在于：其按重量百分比由下列成分组成：8-15%聚合物单体A和聚合物单体B共混物，1-1.5%矿聚物纳米粒子，0.1-0.5%引发剂，0.1-0.5%交联剂，余量为水。
2.根据权利要求1所述的一种水驱井治理用双交联颗粒调堵剂，其特征在于：所述矿聚物纳米粒子为人造锂皂石Laponite。
3.根据权利要求1所述的一种水驱井治理用双交联颗粒调堵剂，其特征在于：所述聚合物单体A可以是丙烯酸、甲基丙烯酸、甲基丙磺酸中一种或任意几种的组合。
4.根据权利要求1所述的一种水驱井治理用双交联颗粒调堵剂，其特征在于：所述聚合物单体B可以是丙烯酰胺、甲基丙烯酰胺、丙烯腈中一种或任意几种的组合。
5.根据权利要求1所述的一种水驱井治理用双交联颗粒调堵剂，其特征在于：所述引发剂为水溶性无机类引发剂，可以是硝酸铈铵、2-酮戊二酸、过硫酸铵中一种或任意几种的组合。
6.根据权利要求1所述的一种水驱井治理用双交联颗粒调堵剂，其特征在于：所述交联剂为N，N’―亚甲基双丙烯酰胺、三烯丙基异氰脲酸酯中一种或二种的组合。
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