CN106186829B - 液固一体化石油支撑剂 - Google Patents
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Abstract
本发明公开了一种新型液固一体化石油支撑剂,属石油助剂领域。所述液固一体化支撑剂为涂有水溶胀高分子涂层的颗粒,其中,所述水溶胀涂层由聚合物、高分子粘合剂、阳离子聚合物等组份组成。该石油支撑剂在使用过程中,不再依靠粘稠的携砂液进入裂缝,自身可以轻松悬浮于清水中,顺利进入裂缝,并膨胀,很好地实现对裂缝支撑。使用方便,且省略高粘液体载体,降低了使用成本,有利于规模化推广应用。
Description
技术领域
本发明涉及一种新型液固一体化石油支撑剂,属石油助剂领域。
背景技术
石油支撑剂又叫石油压裂支撑剂。在石油天然气深井开采时,高闭合压力低渗透性矿床经压裂处理后,使含油气岩层裂开,油气从裂缝形成的通道中汇集而出,此时需要流体注入岩石基层,以超过地层破裂强度的压力,使井筒周围岩层产生裂缝,形成一个具有高层流能力的通道,为保持压裂后形成的裂缝开启,油气产物能顺畅通过。用石油支撑剂随同高压溶液进入地层充填在岩层裂隙中,起到支撑裂隙不因应力释放而闭合的作用,从而保持高导流能力,使油气畅通,增加产量。
近几年,随着国内石油压裂支撑剂的发展,支撑剂已经不再局限于石英砂和陶粒这两种常规类型。各种各样的支撑剂纷纷涌现出来,例如覆膜支撑剂,可固结支撑剂以及选择性透油阻水支撑剂等。但这些支撑剂有一个共同的特点,就是施工过程必须利用高粘液体才能把他们带入裂缝。随着油价的下跌,油气田除了关注支撑剂的性能外更加关注支撑剂的压裂成本。为了降低压裂成本,急需研发成本低、液固一体化石油支撑剂,省略高粘液体,适应规模化应用需求。
发明内容
针对现有技术存在的缺点,本发明目的在于提供一种成本低、液固一体化石油支撑剂,省略高粘液体作为载体。
为实现本发明目的,本发明对石油压裂支撑剂配方进行了筛选试验。
具体技术方案如下:
所述液固一体化支撑剂为涂有水溶胀高分子涂层的颗粒,其中,所述水溶胀涂层由以下组份组成,各组分以重量份计:
占总重量50%-55%的一种或多种聚合物:胍胶、羧甲基胍胶、羟丙基纤维素、丙烯酰胺与丙烯酸盐的共聚物、聚丙烯酰胺、聚丙烯酸、羧甲基纤维素、疏水缔合溶胀聚合物和胶乳聚合物。
占总重量20%-25%的 一种或多种高分子粘合剂:酚醛树脂,环氧树脂,脲醛树脂,秸秆粉,呋喃树脂和聚乙烯吡咯烷酮等。
占总重量20%-25%的一种或多种阳离子聚合物:阳离子改性淀粉、聚环氧氯丙烷铵、阳离子壳聚糖和阳离子聚丙烯酰胺。
所述颗粒选20-50目陶粒颗粒、石英砂,其与高分子涂层的重量比为20-25:1。
优选:占总重量50%的多种聚合物:胍胶、羧甲基胍胶、羟丙基纤维素、丙烯酰胺与丙烯酸盐的共聚物、聚丙烯酰胺、聚丙烯酸、羧甲基纤维素等。
占总重量25%的多种高分子粘合剂:酚醛树脂,环氧树脂,脲醛树脂,秸秆粉,呋喃树脂和聚乙烯吡咯烷酮等。
占总重量25%的多种阳离子聚合物:阳离子改性淀粉、聚环氧氯丙烷铵、阳离子壳聚糖和阳离子聚丙烯酰胺。
所述颗粒选20-50目陶粒颗粒、石英砂,其与高分子涂层的重量比为25:1。
还可以加入一种或多种添加剂:防膨剂、杀菌剂、沥青烯控制剂、降阻剂、助排剂、防结块剂和示踪剂等。
其制备方法如下:
1) 按重量份称取以上组份混合均匀,配制水溶胀涂层;
2) 称取颗粒,加热至150-200℃;加入水溶胀涂层,搅拌均匀;
3) 把步骤2)制得的混合物冷却、干燥、筛分,既得液固一体化支撑剂。
本发明优点:将水溶胀物涂在颗粒表面形成水溶胀涂层,在压裂过程中,不再依靠粘稠的携砂液进入裂缝,自身可以轻松悬浮于清水中,顺利进入裂缝,并膨胀,很好地实现对裂缝支撑。使用方便,且省略高粘液体载体,降低了使用成本,有利于规模化推广应用。
具体实施方式
为对本发明进行更好地说明,举实施例如下:
实施例1
1)称取20g羧甲基纤维素,10g阳离子聚丙烯酰胺和10g酚醛树脂混合均匀;
2)称取陶粒(20/40目)1000g,加热至200℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径20-40目的颗粒液固一体化支撑剂。
实施例2
1)称取20g羧甲基胍胶,10g阳离子改性淀粉和10g酚醛树脂混合均匀;
2)称取石英砂(20/40目)1000g,加热至200℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径20-40目的颗粒液固一体化支撑剂。
实施例3
1)称取55g胍胶,25g阳离子壳聚糖和20g脲醛树脂混合均匀;
2)称取陶粒(30/50目)2000g,加热至180℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
实施例4
1)称取50g聚丙稀酰胺, 25g阳离子壳聚糖和25g呋喃树脂混合均匀;
2)称取陶粒(30/50目)2000g,加热至150℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
实施例5
1)称取20g聚丙稀铣胺,10g阳离子壳聚糖和10g聚乙烯吡咯烷酮混合均匀;
2)称取陶粒(30/50目)1000g,加热至150℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
实施例6
1)称取15g聚丙稀铣胺,5g羧甲基胍胶,10g阳离子聚丙烯酰胺和10g酚醛树脂混合均匀;
2)称取石英砂(30/50目)1000g,加热至170℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
实施例7
1)称取20g聚丙稀铣胺,5g阳离子改性淀粉,5g阳离子聚丙烯酰胺和10g酚醛树脂混合均匀;
2)称取石英砂(30/50目)1000g,加热至170℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
实施例8
1)称取20g聚丙稀铣胺,10g阳离子聚丙烯酰胺, 5g秸秆粉和5g酚醛树脂混合均匀;
2)称取石英砂(30/50目)1000g,加热至170℃,上述混合物,搅拌均匀;
3)把获得的支撑剂冷却后,筛分,干燥。得到粒径30-50目的颗粒液固一体化支撑剂。
支撑剂性能测试:
向量筒中加入30g上述制得的本发明支撑剂样品,然后加入足量的水。将量筒倒转约30 次,并且沉降10 分钟,观察沉降的床高度。结果列于表1。
表1 支撑剂膨胀实验
Claims (2)
1.一种液固一体化支撑剂,其特征在于,其为涂有水溶胀高分子涂层的颗粒,其中,所述水溶胀高分子涂层由以下组份组成,各组分以重量份计:
占总重量50%的聚合物:聚丙烯酰胺;
占总重量25%的高分子粘合剂:酚醛树脂;
占总重量25%的阳离子聚合物:阳离子改性淀粉和阳离子聚丙烯酰胺;
所述颗粒选20-50目陶粒颗粒、石英砂,其与高分子涂层的重量比为25:1。
2.如权利要求1所述的液固一体化支撑剂,其特征在于,加入一种或多种添加剂:防膨剂、杀菌剂、沥青烯控制剂、降阻剂、助排剂、防结块剂或示踪剂。
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CN104379697A (zh) * | 2012-04-19 | 2015-02-25 | 自悬浮支撑有限公司 | 用于水力压裂的自悬浮支撑剂 |
CN104946234A (zh) * | 2014-03-28 | 2015-09-30 | 北京仁创科技集团有限公司 | 一种自悬浮支撑剂及其制备方法 |
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CN104946234A (zh) * | 2014-03-28 | 2015-09-30 | 北京仁创科技集团有限公司 | 一种自悬浮支撑剂及其制备方法 |
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