CN110373174A - 海水基压裂液增效剂及压裂液和制备方法 - Google Patents

海水基压裂液增效剂及压裂液和制备方法 Download PDF

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CN110373174A
CN110373174A CN201910681589.9A CN201910681589A CN110373174A CN 110373174 A CN110373174 A CN 110373174A CN 201910681589 A CN201910681589 A CN 201910681589A CN 110373174 A CN110373174 A CN 110373174A
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fracturing fluid
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陈紫薇
贾云鹏
付大其
刘学伟
赵玉东
闫阳
构晓婷
张润泽
赵冬华
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China National Petroleum Corp
Dagang Oilfield Group Co Ltd
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Abstract

本发明属于油田压裂液领域，具体涉及一种海水基压裂液增效剂及压裂液和制备方法。海水基压裂液增效剂包括下述质量份组分：清水50‑60份、乙二胺四亚甲基磷酸钠20‑25份、以及多元醇15‑25份。与增效剂的主要作用在于两方面，一方面，加入乙二胺四亚甲基磷酸钠，可以多个金属离子螯合，形成多个单体结构大分子网状络合物，松散地分散水中，使钙、镁正常结晶被破坏，降低钙镁离子对瓜胶溶胀的影响，溶胀速度大幅提高，使同样条件下海水基压裂液改性瓜胶用量降低15％，可实现海水基压裂液连续混配；降低了海水中的钙镁离子生成沉淀的风险；另一方面，复配多元醇，可以有效提高改性瓜胶海水基压裂液的耐温能力，满足压裂施工的需要。

Description

海水基压裂液增效剂及压裂液和制备方法
技术领域
本发明属于油田压裂液领域，具体涉及一种海水基压裂液增效剂及压裂液和制备方法。
背景技术
现有海水基改性瓜胶压裂液为了鳌合海水中的钙镁离子，加入较高用量的单一组份的鳌合剂，以降低钙、镁等二价离子对改性瓜胶分子溶胀产生的不利影响，但是要获得耐高温海水基压裂液，仍需要通过(1)提高增稠剂用量(0.65％以上)；(2)添加大量的耐温增强剂、除氧剂；(3)添加含有氢氧根离子或碳酸根离子的pH调节剂，提高压裂液的耐高温能力。这必然造成压裂液基液罐中黏度过高，施工时泵送困难，压裂液降阻性能差，无法实现大排量和连续混配施工；压裂液破胶性能差，残渣含量高，压裂液易与海水中钙、镁离子形成沉淀物，对储层基质渗透率及裂缝支撑带污染严重；化学添加剂种类多，不利于海上环境保护。为此，迫切需要开发一种增效剂，以解决海水基改性瓜胶压裂液存在的技术难题。
发明内容
本发明旨在针对上述现有技术中存在的海水基压裂液螯合剂加入量大，压裂液耐温性能差的技术问题，提供一种海水基压裂液增效剂及压裂液和制备方法。
本发明为实现上述目的，采用以下技术方案：
一种海水基压裂液增效剂，，包括下述质量份组分：清水50-60份、乙二胺四亚甲基磷酸钠20-25份、以及多元醇15-25份，即得海水基压裂液增效剂。所述多元醇选自乙二醇，丙三醇的中一种。
所述的海水基压裂液增效剂的制备方法，其特征在于，包括下述步骤：常温常压，搅拌，向反应釜中加入组分量清水与乙二胺四亚甲基磷酸钠、以及多元醇，充分混合，形成均一溶液，制成增效剂。
本发明的海水基压裂液增效剂，可用于制备海水基压裂液。
一种海水基压裂液，包括下述质量份组分：海水1000份、稠化剂5-6.5份、助排剂3-5份，杀菌剂1-2份、交联剂4-5份以及增效剂3-5份。
所述的稠化剂为羟丙基瓜胶、香豆胶或田菁胶。
所述的助排剂为烷基苷表面活性剂；
所述的交联剂为有机硼锆交联剂。
所述的杀菌剂为十二烷基苄基氯化铵。
所述的海水基压裂液制备方法，其特征在于，包括下述步骤：按组分量取海水，加入混调器中，调电压50V～55V，依次加入稠化剂，助排剂，杀菌剂，混调器高速搅拌90s；加入增效剂以及交联剂即得。
与现有技术相比，本发明的有益效果是：
与现有技术相比，本发明的有益效果是：增效剂的主要作用在于两方面，一方面，加入乙二胺四亚甲基磷酸钠，其能与水混溶，无毒无污染，化学稳定性及耐温性好，在水溶液中能离解成8个正负离子，可以多个金属离子螯合，形成多个单体结构大分子网状络合物，松散地分散于水中，使钙、镁垢正常结晶被破坏，降低钙镁离子对瓜胶溶胀的影响，溶胀速度大幅提高，使同样条件下海水基压裂液改性瓜胶用量降低15％，可实现海水基压裂液连续混配；降低了海水中的钙镁离子生成沉淀的风险；另一方面，复配多元醇，可以有效提高改性瓜胶海水基压裂液的耐温能力，满足压裂施工的需要。
具体实施方式
为了使本技术领域的技术人员更好地理解本发明的技术方案，下面结合最佳实施例对本发明作进一步的详细说明。
实施例1：所述海水基压裂液增效剂配制方法，常温常压，搅拌，向反应釜中加入60kg清水与25kg乙二胺四亚甲基磷酸钠、25kg甘油按比例充分混合，形成均一溶液，制成增效剂。
实施例2：所述海水基压裂液增效剂配制方法，常温常压，搅拌，向反应釜中加入50kg清水与20kg乙二胺四亚甲基磷酸钠、15kg甘油按比例充分混合，形成均一溶液，制成增效剂。
实施例3：所述海水基压裂液增效剂配制方法，常温常压，搅拌，向反应釜中加入50kg清水与25kg乙二胺四亚甲基磷酸钠、25kg甘油按比例充分混合，形成均一溶液，制成增效剂。
实施例3为最佳实施例，以实施例3为例进行说明。
实施例4：压裂液的制备：按重量量取渤海湾海水1000份，加入混调器中，调电压50V～55V，依次加入稠化剂5.5份，助排剂3份，杀菌剂1份，混调器高速搅拌90s；加入实施例3配制的增效剂3.5份，交联剂4份，搅拌至旋涡闭合，测得交联时间31s,即得所述海水配制改性瓜胶海水基压裂液所述的稠化剂为羟丙基瓜胶。所述的助排剂为烷基苷表面活性剂，所述的交联剂为有机硼锆交联剂。所述的杀菌剂为十二烷基苄基氯化铵。助排剂、交联剂以及杀菌剂均为市售产品。
对比例1(原有技术)：原有技术取渤海湾海水1000份，加入混调器中，调电压50V～55V，依次加入稠化剂6.5份，助排剂3份，杀菌剂1份，混调器高速搅拌120s；加入有机硼交联剂5份，络合剂6份，pH调节剂2.5份，温度稳定剂10份，搅拌至旋涡闭合，测得交联时间6s,即得海水基压裂液。所述的稠化剂为羟丙基瓜胶；所述的助排剂为磺酸盐表面活性剂；所述的杀菌剂为十二烷基二甲苄基氯化铵。所述的交联剂为有机硼锆交联剂；所述络合剂为EDTA；所述的pH调节剂为NaOH；所述温度稳定剂为硫代硫酸钠或硫脲。表1为相同实验条件下，原有技术与本发明技术形成的海水基压裂液性能对比数据表。
表1
从表1数据中可知，本发明形成的海水基压裂液，相对于传统技术，其基液表观黏度低，更好的满足压裂液泵送需要，交联时间可调，使压裂液具有更好的降阻性能；岩心基质渗透率损害率低，破胶时间可调，残渣含量较低使，压裂液具有更好的清洁程度；与原有技术相比，改性瓜胶使用浓度降低15％，使用的硼增效剂也更清洁环保。综上所述，本发明形成的硼交联海水基改性瓜胶压裂液具有优良的适用性和经济性。
以上内容仅为本发明的较佳实施例，对于本领域的普通技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，本说明书内容不应理解为对本发明的限制。

Claims (9)

1.一种海水基压裂液增效剂，其特征在于，包括下述质量份组分：清水50-60份、乙二胺四亚甲基磷酸钠20-25份、以及多元醇15-25份。
2.根据权利要求1所述的海水基压裂液增效剂，其特征在于，所述多元醇选自乙二醇或者丙三醇。
3.一种权利要求1或者2所述的海水基压裂液增效剂的制备方法，其特征在于，包括下述步骤：常温常压，搅拌，向反应釜中加入组分量清水与乙二胺四亚甲基磷酸钠、以及多元醇，充分混合，形成均一溶液，制成增效剂。
4.一种海水基压裂液，其特征在于，包括下述质量份组分：海水1000份、稠化剂5-6份、助排剂3-5份，杀菌剂1-2份、交联剂4-5份以及增效剂3-5份。
5.根据权利要求4所述的海水基压裂液，其特征在于，所述的稠化剂为羟丙基瓜胶、香豆胶或田菁胶。
6.根据权利要求4所述的海水基压裂液，其特征在于，所述的助排剂为烷基苷表面活性剂。
7.根据权利要求4所述的海水基压裂液，其特征在于，所述的交联剂为有机硼锆交联剂。
8.根据权利要求4所述的海水基压裂液，其特征在于，所述的杀菌剂为十二烷基苄基氯化铵。
9.一种制备权利要求3-8任一项所述的海水基压裂液，其特征在于，包括下述步骤：按组分量取海水，加入混调器中，调电压50V～55V，依次加入稠化剂，助排剂，杀菌剂，混调器高速搅拌90s；加入增效剂以及交联剂即得。
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CN111718702A (zh) * 2020-07-20 2020-09-29 中国石油大学(北京) 一种海水基压裂充填液及其制备方法与应用

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