CN111690397A - 一种可循环一元化压裂液 - Google Patents
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Abstract
本发明涉及一种可循环一元化压裂液,由20‑25%改性酰胺,10‑15%表面活性剂、5‑10%螯合剂、10‑15%分散剂、20‑25%溶剂和10‑35%水组成的混合物,上述的百分数均为质量百分数。本发明在水中产生伸展缔合,从而快速形成具有良好携砂性能的粘弹性胶体。本发明满足目前常规压裂液的技术指标,同时具备了常规水基压裂液的防粘土膨胀、降低表界面张力、防止并破坏原油乳化、防止腐败等功能,减少了配套助剂的使用,减少了环境污染。操作工序简单,可在线实时混配,大幅度降低了压裂液施工成本。本发明压裂液耐盐型好、在污水中可增粘,返排液经简单沉降处理后可实现回用,有效解决了返排液堆积对环境造成的污染。
Description
技术领域
本发明属于油气井水力压裂用压裂液技术领域,具体涉及一种可循环的一元化压裂液。
背景技术
水力压裂是油气藏增产改造、油气水井增产增注的重要措施。目前国内外广泛使用的压裂液体系主要以水基压裂液为主,其中瓜胶压裂液因其性能好而被广泛使用。瓜胶压裂液体系除了植物胶增稠剂外,还添加了多种助剂,如杀菌剂、助排剂、粘土稳定剂、起泡剂、交联剂等产品,用于提高压裂液的综合性能。
随着近年来页岩(油)气、致密(油)天然气水平井压裂增产技术的进步,大排量、大规模的压裂作业逐步替代传统中低排量、常规规模的压裂作业。这种大排量、大规模的现场作业向传统压裂方式提出了挑战,要求压裂工序尽量简洁化、压裂液具有更低的摩阻。
随着环境保护意识及节水节能要求的加强,国内外开始逐步要求油气田(含煤层气田、页岩油气田)压裂返排液替代传统的淡水以配制压裂液。
综上,目前常规压裂液体系在压裂施工过程中存在以下问题:
(1)夏季配液存在液体易腐败,抗菌性差
(2)低温溶胀性差,在冬天施工困难。
(3)在污水中易腐败降粘,对水质要求高。
(4)配套助剂种类繁多,导致施工后产生大量的废弃物如包装桶、废液等,给现场应用造成极大的麻烦。
(5)配液工序繁琐,对计量要求高,并且需要提前配液,实现配液消耗大量的物力人力。
(6)压裂后产生的返排液需要处理,增加了费用支出。随着环保的日益严格,要求压裂液可回收重复利用。
发明内容
为解决现有技术的不足,本发明的目的在于提供一种可循环的一元化压裂液。
为了实现上述目的,本发明采用如下的技术方案:
一种可循环一元化压裂液,由20-25%改性酰胺,10-15%表面活性剂,5-10%螯合剂,10-15%分散剂,20-25%溶剂和10-35%水组成的混合物;上述的百分数均为质量百分数。
所述改性酰胺为丙烯酰胺通过疏水缔合化改性而制得的疏水缔合三元共聚物,丙烯酰胺-AMPS—十八烷基二甲基烯丙基氯化铵、丙烯酰胺-AMPS-十六烷基二甲基烯丙基氯化铵中的一种。
所述表面活性剂为月桂醇聚氧乙烯醚硫酸酯钠盐、十二烷基苯磺酸钠、松香酸聚氧乙烯琥珀酸单酯磺酸钠中的一种。
所述螯合剂为氨基三亚甲基膦酸、乙二胺四甲叉膦酸、二乙烯三胺五甲叉膦酸中的一种。
所述分散剂为OP-10、Span-80、Tween-80中的一种。
所述溶剂为甲醇、乙醇、乙二醇中的一种。
本发明在水中产生伸展缔合,从而快速形成具有良好携砂性能的粘弹性胶体,一剂可实现常规压裂液多剂功能,配置压裂液时仅使用可循环的一元化压裂液即可实现压裂施工。相对于现有技术,具有以下几个优点:
1、一剂满足目前常规压裂液的技术指标,同时具备了常规水基压裂液的防粘土膨胀、降低表界面张力、防止并破坏原油乳化、防止腐败等功能。
2、一元化可循环压裂液由多种助剂变为一剂,减少了配套助剂如杀菌剂、助排剂、粘土稳定剂、起泡剂、交联剂的使用,减少了作业过程中的运输及包装,减少了环境污染。
3、操作工序简单,减少施工程序,可在线实时混配,大幅度降低了压裂液施工成本。
4、本发明压裂液耐盐型好、在污水中可增粘,返排液经简单沉降处理后可实现回用,有效解决了返排液堆积对环境造成的污染。
具体实施方式
以下结合具体实施例对本发明作具体的介绍。
实施例1
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS—十八烷基二甲基烯丙基氯化铵20g,表面活性剂月桂醇聚氧乙烯醚硫酸酯钠盐15g,螯合剂乙二胺四甲叉膦酸5g,分散剂Span-80 15g,溶剂乙醇20g和水25g混合组成。
实施例2
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS—十八烷基二甲基烯丙基氯化铵25g,表面活性剂松香酸聚氧乙烯琥珀酸单酯磺酸钠12g,螯合剂氨基三亚甲基膦酸8g,分散剂OP-10 12g,溶剂乙二醇23g和水20g混合组成。
实施例3
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS—十八烷基二甲基烯丙基氯化铵22g,表面活性剂十二烷基苯磺酸钠10g,螯合剂二乙烯三胺五甲叉膦酸10g,分散剂Tween-80 10g,溶剂甲醇25g和水23g混合组成。
实施例4
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS-十六烷基二甲基烯丙基氯化铵21g,表面活性剂十二烷基苯磺酸钠13g,螯合剂氨基三亚甲基膦酸7g,分散剂OP-10 14g,溶剂甲醇22g和水23g混合组成。
实施例5
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS-十六烷基二甲基烯丙基氯化铵24g,表面活性剂月桂醇聚氧乙烯醚硫酸酯钠盐11g,螯合剂乙二胺四甲叉膦酸10g,分散剂Span-80 15g,溶剂乙二醇25g和水15g混合组成。
实施例6
一种可循环一元化压裂液,该压裂液由改性酰胺丙烯酰胺-AMPS-十六烷基二甲基烯丙基氯化铵25g,表面活性剂松香酸聚氧乙烯琥珀酸单酯磺酸钠10g,螯合剂二乙烯三胺五甲叉膦酸5g,分散剂Tween-80 15g,溶剂乙醇25g和水20g混合组成。
应用例1
在现场压裂施工时,在泵注入98000kg水的同时,加入2000kg可循环一元化压裂液混合而形成的压裂液。本发明的压裂液与常规方法配置的压裂液从现场施工方面进行对比,具有以下优点:
(1)现场配置简单,一剂代替多剂,减少了作业程序。
(2)可在线实时混配,节省了设备和人力、大幅度降低了压裂液施工成本。
(3)减少了大量的塑料包装,减少了塑料桶余料的污染和浪费。
与常规瓜胶压裂液对比情况如下表:
需要说明的是,上述实施例不以任何形式限制本发明,凡采用等同替换或等效变换的方式所获得的技术方案,均落在本发明的保护范围内。
Claims (6)
1.一种可循环一元化压裂液,其特征是:该压裂液由20-25%改性酰胺,10-15%表面活性剂,5-10%螯合剂,10-15%分散剂,20-25%溶剂和10-35%水组成的混合物;上述的百分数均为质量百分数。
2.如权利要求1所述的一种可循环一元化压裂液,其特征在于:所述改性酰胺为丙烯酰胺通过疏水缔合化改性而制得的疏水缔合三元共聚物,丙烯酰胺-AMPS—十八烷基二甲基烯丙基氯化铵、丙烯酰胺-AMPS-十六烷基二甲基烯丙基氯化铵中的一种。
3.如权利要求1所述的一种可循环一元化压裂液,其特征在于:所述表面活性剂为月桂醇聚氧乙烯醚硫酸酯钠盐、十二烷基苯磺酸钠、松香酸聚氧乙烯琥珀酸单酯磺酸钠中的一种。
4.如权利要求1所述的一种可循环一元化压裂液,其特征在于:所述螯合剂为氨基三亚甲基膦酸、乙二胺四甲叉膦酸、二乙烯三胺五甲叉膦酸中的一种。
5.如权利要求1所述的一种可循环一元化压裂液,其特征在于:所述分散剂为OP-10、SPan-80、Tween-80中的一种。
6.如权利要求1所述的一种可循环一元化压裂液,其特征在于:所述溶剂为甲醇、乙醇、乙二醇中的一种。
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