CN110564393A - 一种微膨型封堵剂及其制备方法 - Google Patents
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Abstract
本发明涉及油田化学领域,属于针对油田现场调堵的一种微膨型封堵剂及其制备方法。本发明主要解决了油田常用的封堵剂固化后自身膨胀倍数较大严重影响堵剂体系强度的问题。它按重量百分比由下列成分组成:14%‑17%的主剂,0.3%‑0.4%的交联剂,0.15%‑0.18%的增强剂,4%‑9%的微膨添加剂,余量为水。本发明具有很高的固化强度和封堵强度,堵剂固化后在碱性环境中浸泡膨胀体积膨胀倍数可控,能够满足目前油田现场的封堵要求等优点。
Description
技术领域
本发明涉及油田化学领域,属于针对油田现场调堵的一种微膨型封堵剂及其制备方法。
背景技术
目前油田常用的单液法堵水剂固化后在岩心的封堵实验中表现出较好的封堵强度,同时在油田现场也表现出较好的封堵封窜效果,但是该类堵剂长期在碱性环境中浸泡后,堵剂体积膨胀到固化时体积的三倍以上,堵剂固化强度也会随体积不断增大而显著降低,堵剂出现破碎现象,封堵强度下降,封堵长期稳定性也无法保证。
发明内容
本发明目的是研制出堵剂固化后浸泡于碱液中膨胀体积可控,固化强度、封堵长期稳定性能够满足目前油田现场的封堵要求的一种微膨型封堵剂及其制备方法。
本发明的一种微膨型封堵剂按重量百分比由下列成分组成: 14%-17%的主剂,0.3%-0.4%的交联剂,0.15%-0.18%的增强剂, 4%-9%的微膨添加剂,余量为水。
一种微膨型封堵剂的制备方法,包括如下步骤:
a.常温下将主剂14%-17%加水搅拌溶解;
b.向a中所得溶液中加入交联剂0.3%-0.4%搅拌溶解;
c.向b中所得溶液中加入增强剂0.15%-0.18%搅拌溶解;
d.向c中所得溶液中加入微膨添加剂4%-9%搅拌至完全溶解,即得到本发明。
所述主剂为经过辐照后的丙烯酰胺与膨润土的混合物。
所述交联剂为过硫酸钠、过硫酸钾的一种或两种的混合。
所述增强剂为N-N甲叉基双丙烯酰胺。
所述微膨添加剂为OP-10或十二烷基苯磺酸钠。
本发明主剂中丙烯酰胺的分子式为:C3H5NO、膨润土分子式为:Al2O3·4(SiO2)·H2O;交联剂中过硫酸钠的分子式为:Na2S2O8、过硫酸钾的分子式为:K2S2O8;增强剂中N-N甲叉基双丙烯酰胺的分子式为:C6H8O7;微膨添加剂中OP-10的分子式为:C8H17C6H4O(CH2CH2O)10H、十二烷基苯磺酸钠的分子式为:C18H29NaO3S。
本发明的作用机理:本发明的一种微膨型封堵剂由主剂、交联剂、增强剂、微膨添加剂组成,主剂为高分子化合物,交联剂为过硫酸盐,增强剂为双丙烯酰胺,微膨添加剂与水混合变粘稠,并且能中和一定量的碱。将上述几种组分按一定配比混合后,高分子化合物在交联剂的作用下,通过增强剂的连接形成一个三维的网状体,网状体内的空间由带有多价阳离子或极性基团的分子填充。多价阳离子或极性基团与主链和增强剂上的极性基团通过配位键或基团的极性作用,既增强了主剂与主剂、主剂与增强剂、增强剂与增强剂之间的连接,又限制了主体链段的旋转和振动,最终使堵剂强度增大。
OP-10或十二烷基苯磺酸钠的引入,在聚合物分子链中形成致密的水化溶剂层,增强其对水分子的束缚能力,以此抗衡盐离子的去水化作用。同时,酰胺基耐水解能力的大幅提高也提高了金属离子对聚合物分子链破坏的抵抗作用。OP-10或十二烷基苯磺酸钠具有抑制酰胺基水解和增强热稳定性的作用,同时增加了分子链的刚性,使其耐碱性显著提高,改善了 HPAM 耐碱性差的缺陷,保证了堵剂固化后在碱性环境中浸泡膨胀体积膨胀倍数可控。
本发明与现有堵水剂相比有如下优点:
1)、堵剂固化后在碱液中长期浸泡,体积膨胀倍数可控;
2)、堵剂在碱液中浸泡膨胀后,仍能保持较高的固化强度、长期封堵稳定性也较好。
具体实施方式:下面结合实施例对本发明作进一步说明:本发明的一种微膨型封堵剂按重量百分比由下列成分组成:14%-17%的主剂,0.3%-0.4%的交联剂,0.15%-0.18%的增强剂,4%-9%的微膨添加剂,余量为水。
一种微膨型封堵剂的制备方法,包括如下步骤:
a.常温下将主剂14%-17%加水搅拌溶解;
b.向a中所得溶液中加入交联剂0.3%-0.4%搅拌溶解;
c.向b中所得溶液中加入增强剂0.15%-0.18%搅拌溶解;
d.向c中所得溶液中加入微膨添加剂4%-9%搅拌至完全溶解,即得到本发明。
所述主剂为经过辐照后的丙烯酰胺与膨润土的混合物。
所述交联剂为过硫酸钠、过硫酸钾的一种或两种的混合。
所述增强剂为N-N甲叉基双丙烯酰胺。
所述微膨添加剂为OP-10或十二烷基苯磺酸钠。
实施例1:该封堵剂由主剂、交联剂、增强剂、微膨添加剂和水组成,其组分构成包括:主剂—经过辐照后的丙烯酰胺与膨润土的混合物:14%,交联剂—过硫酸钠0.3%,增强剂—N-N甲叉基双丙烯酰胺:0.18%,微膨添加剂—OP-10:4%,水:81.52%。
该封堵剂的制备方法,包括如下步骤:
a.常温下将经过辐照后的丙烯酰胺与膨润土的混合物14%加水搅拌溶解;
b.向a中所得溶液中加入过硫酸钠0.3%搅拌溶解;
c.向b中所得溶液中加入N-N甲叉基双丙烯酰胺0.18%搅拌溶解;
d.向c中所得溶液中加入OP-10:4%搅拌至完全溶解,即得到本发明。
表1 微膨型堵剂1在碱液中长期浸泡的稳定性
实施例2:该封堵剂由主剂、交联剂、增强剂、微膨添加剂和水组成,主剂—经过辐照后的丙烯酰胺与膨润土的混合物:17%,交联剂—过硫酸钾:0.4%,增强剂—N-N甲叉基双丙烯酰胺:0.15%,微膨添加剂—十二烷基苯磺酸钠:9%,水:73.45%。
该封堵剂的制备方法,包括如下步骤:
a.常温下将经过辐照后的丙烯酰胺与膨润土的混合物17%加水搅拌溶解;
b.向a中所得溶液中加入过硫酸钾0.4%搅拌溶解;
c.向b中所得溶液中加入N-N甲叉基双丙烯酰胺0.15%搅拌溶解;
d.向c中所得溶液中加入十二烷基苯磺酸钠9%搅拌至完全溶解,即得到本发明。
表2 微膨型堵剂2在碱液中长期浸泡的稳定性
实施例3:该封堵剂由主剂、交联剂、增强剂、微膨添加剂和水组成,主剂—经过辐照后的丙烯酰胺与膨润土的混合物:15.5%,交联剂:过硫酸钠:0.15%、过硫酸钾:0.2%,增强剂—N-N甲叉基双丙烯酰胺:0.16%,微膨添加剂—十二烷基苯磺酸钠:6%,水:73.45%。
该封堵剂的制备方法,包括如下步骤:
a.常温下将经过辐照后的丙烯酰胺与膨润土的混合物15.5%加水搅拌溶解;
b.向a中所得溶液中加入过硫酸钠0.15%、过硫酸钾0.2%,搅拌溶解;
c.向b中所得溶液中加入N-N甲叉基双丙烯酰胺0.16%搅拌溶解;
d.向c中所得溶液中加入十二烷基苯磺酸钠6%搅拌至完全溶解,即得到本发明。
表3 微膨型堵剂3在碱液中长期浸泡的稳定性
利用微膨型堵水剂进行室内岩心封堵实验,岩心的突破压力大于9MPa,封堵率97%以上,堵剂在碱液中长期封堵的稳定性能好。
Claims (6)
1.一种微膨型封堵剂,其特征在于:它按重量百分比由下列成分组成:14%-17%的主剂,0.3%-0.4%的交联剂,0.15%-0.18%的增强剂,4%-9%的微膨添加剂,余量为水。
2.一种微膨型封堵剂的制备方法,其特征在于:包括如下步骤:
a.常温下将主剂14%-17%加水搅拌溶解;
b.向a中所得溶液中加入交联剂0.3%-0.4%搅拌溶解;
c.向b中所得溶液中加入增强剂0.15%-0.18%搅拌溶解;
d.向c中所得溶液中加入微膨添加剂4%-9%搅拌至完全溶解,即得到本发明。
3.根据权利要求1所述的一种微膨型封堵剂,其特征在于:所述主剂为经过辐照后的丙烯酰胺与膨润土的混合物。
4.根据权利要求1所述的一种微膨型封堵剂,其特征在于:所述交联剂为过硫酸钠、过硫酸钾的一种或两种的混合。
5.根据权利要求1所述的一种微膨型封堵剂,其特征在于:所述增强剂为N-N甲叉基双丙烯酰胺。
6.根据权利要求1所述的一种微膨型封堵剂,其特征在于:所述微膨添加剂为OP-10或十二烷基苯磺酸钠。
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