CN115572590A - 一种高含水高凝油井用清蜡降粘剂及其评价方法 - Google Patents
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Abstract
本发明公开了一种高含水高凝油井用清蜡降粘剂,包括以下组分,以体积百分比计,芳烃20‑40%,超低界面张力表面活性剂5‑10%,助溶剂20‑30%,互溶剂10‑20%,蜡晶改性剂3‑5%,有机加重剂5‑15%,水1‑15%。本发明的清蜡剂是一种有油水两溶微乳型纳米清蜡剂,其油相水相混合乳化后达到纳米级别,形成微乳液呈半透明,热力学稳定体系;本发明油基清蜡剂的比重为0.90‑1.00g/cm3,可穿透沉默度到达井底,稠油降粘率大于50%,清蜡效果较佳。
Description
技术领域
本发明涉及石油开发技术领域,具体涉及一种高含水高凝油井用清蜡降粘剂及其评价方法。
背景技术
油田开发过程中的油井结蜡,严重影响了油井的正常生产,油管壁结蜡会增大对地层的回压,降低油井产量;油管和抽油杆间的结蜡会增大抽油机载荷,甚至造成抽油泵蜡卡;地层射孔炮眼和泵入口处结蜡,会增大油流阻力降低泵效;地层内部结蜡会大幅度降低其油相渗透率,使油井大幅度减产或停产等。
油田开采的中后期,油井采出水已进入高含水阶段。传统的油基清蜡剂由于密度低,采用现在的加药工艺药剂无法沉入井底,加药后无法达到清防蜡的效果。因此需要新的清防蜡剂以满足使用要求。
与此同时,针对清防蜡剂的实验评价方法甚多,但都存在繁琐或者评价效率不高以及无法准确的模拟不同温度下的实验效果的问题。
发明内容
本发明的目的是针对上述背景技术中存在的不足,提供一种用于高含水高凝油井的清蜡效果好的清蜡降粘剂,以及针对该清蜡降粘剂的评价方法。
为实现上述目的,本发明一种高含水高凝油井用清蜡降粘剂,采用了如下技术方案:
一种高含水高凝油井用清蜡降粘剂,其特征在于,包括以下组分,以体积百分比计,
与现有技术相比,本发明的有益效果是:
本发明的清蜡剂是一种有油水两溶微乳型纳米清蜡剂,其油相水相混合乳化后达到纳米级别,形成微乳液呈半透明,热力学稳定体系;本发明油基清蜡剂的比重为0.90-1.00g/cm3,可穿透沉默度到达井底,稠油降粘率大于50%,清蜡效果较佳。
本发明还提供一种上述清蜡降粘剂的评价方法,包括以下步骤,
a,根据油井的实际温度来确定实验温度的区间,实验温度由高到低,以10℃之差递减;
b,在50ml的具塞量筒中加入实际的含水原油、药剂,放在实验温度的水浴锅中恒温30min;
c,恒温过后,取出具塞量筒上下使劲晃动50次左右,打开盖子倒扣在锥形瓶中;
d,放入同样实验温度的烘箱中,继续恒温30min,直至量筒里不流出蜡油为止;
e,最后放入干燥器里30min,进行降温称量测算。
与现有技术相比,本发明方法的有益效果在于,加入到带塞量筒的含水原油、药剂放在不同温度下的水浴锅中,可以准确的模拟油井的实际温度情况,从而可以模拟现场油井情况。含水原油和药剂上下晃动均匀后倒扣在锥形瓶中,放入同样温度条件烘箱中恒温,直至没有蜡油流出为止。这样可以准确的模拟出药剂在不同温度下的效果。进而保证高含水高凝油井防蜡率测定的稳定准确,进而体现出对清蜡降粘剂的准确评价。
具体实施方式
下面将结合本发明实施例,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
一种高含水高凝油井用清蜡降粘剂,包括以下组分,以体积百分比计,
具体的,芳烃为二甲苯和/或环己基苯,超低界面张力表面活性剂为石油磺酸盐和/或双子表面活性剂,助溶剂为甲醇、苯甲醇、正丁醇、异辛醇、乙二醇单丁醚中的一种或多种,互溶剂为十二烷基酚聚氧乙烯醚、司盘-80、吐温-80中的一种或多种,蜡晶改性剂为1-甲基萘和/或乙烯-醋酸乙烯共聚物,有机加重剂为1-甲基萘和/或二元酸酯。
进一步的,芳烃为二甲苯1-3体积份、环己基苯1-4体积份的混合液,超低界面张力表面活性剂为石油磺酸盐1-2体积份、双子表面活性剂1-3体积份的混合液,助溶剂为甲醇3-4体积份、苯甲醇1-2体积份、正丁醇1-2体积份、异辛醇1-2体积份、乙二醇单丁醚4-5体积份的混合液,互溶剂为十二烷基酚聚氧乙烯醚3-5体积份、司盘-80体积份1-2、吐温-801-2体积份的混合液,蜡晶改性剂为1-甲基萘1-2体积份、乙烯-醋酸乙烯共聚物1-2体积份的混合液,有机加重剂为1-甲基萘1-2体积份、二元酸酯1-3体积份的混合液。
上述原料经过混合形成清蜡降粘剂,其比重为0.90-1.00g/cm3,可穿透沉默度到达井底,溶蜡速率高于中石化要求10-20%,降低原油中的石蜡分子形成固相晶格,原油降粘效果显著,稠油降粘率达到50%以上。
本发明还公开了上述清蜡降粘剂的评价方法,包括,
a,根据油井的实际温度来确定实验温度的区间,实验温度由高到低,以10℃之差递减(如油井最高温度70℃,实验评价温度为70℃、60℃、50℃、40℃、30℃、20℃);
b,在50ml的具塞量筒中加入实际的含水原油、药剂(药剂为上述清蜡降粘剂),放在实验温度的水浴锅中恒温30min;
c,恒温过后,取出具塞量筒上下使劲晃动50次左右,打开盖子倒扣在锥形瓶中,使原油流出量筒到锥形瓶中;
d,将步骤c中的具塞量筒以及锥形瓶放入同样实验温度的烘箱中,继续恒温30min,直至量筒里不流出蜡油为止;
e,最后放入干燥器里30min,进行降温称量测算。
本发明加入到带具塞量筒的含水原油、药剂放在不同温度下的水浴锅中,可以准确的模拟油井的实际温度情况,从而可以模拟现场油井情况。含水原油和药剂上下晃动均匀后倒扣在锥形瓶中,放入同样温度条件烘箱中恒温,直至没有蜡油流出为止,这样可以准确的模拟出药剂在不同温度下的效果,得到药剂在井下不同位置处的清蜡效果。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何标记视为限制所涉及的权利要求。
Claims (4)
2.根据权利要求1所述的一种高含水高凝油井用清蜡降粘剂,其特征在于,所述芳烃为二甲苯和/或环己基苯,所述超低界面张力表面活性剂为石油磺酸盐和/或双子表面活性剂,所述助溶剂为甲醇、苯甲醇、正丁醇、异辛醇、乙二醇单丁醚中的一种或多种,所述互溶剂为十二烷基酚聚氧乙烯醚、司盘-80、吐温-80中的一种或多种,所述蜡晶改性剂为1-甲基萘和/或乙烯-醋酸乙烯共聚物,所述有机加重剂为1-甲基萘和/或二元酸酯。
3.根据权利要求2所述的一种高含水高凝油井用清蜡降粘剂,其特征在于,所述芳烃为二甲苯1-3体积份、环己基苯1-4体积份,所述超低界面张力表面活性剂为石油磺酸盐1-2体积份、双子表面活性剂1-3体积份,所述助溶剂为甲醇3-4体积份、苯甲醇1-2体积份、正丁醇1-2体积份、异辛醇1-2体积份、乙二醇单丁醚4-5体积份,所述互溶剂为十二烷基酚聚氧乙烯醚3-5体积份、司盘-80体积份1-2、吐温-801-2体积份,所述蜡晶改性剂为1-甲基萘1-2体积份、乙烯-醋酸乙烯共聚物1-2体积份,所述有机加重剂为1-甲基萘1-2体积份、二元酸酯1-3体积份。
4.一种高含水高凝油井用清蜡降粘剂的评价方法,其特征在于,包括以下步骤,
a,根据油井的实际温度来确定实验温度的区间,实验温度由高到低,以10℃之差递减;
b,在50ml的具塞量筒中加入实际的含水原油、药剂,放在实验温度的水浴锅中恒温30min;
c,恒温过后,取出具塞量筒上下使劲晃动50次左右,打开盖子倒扣在锥形瓶中;
d,放入同样实验温度的烘箱中,继续恒温30min,直至量筒里不流出蜡油为止;
e,最后放入干燥器里30min,进行降温称量测算。
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Citations (5)
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