CN106566523A - 一种聚合物型酸性滑溜水及其制备方法 - Google Patents
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Abstract
本发明涉及油气田储层改造技术领域，具体涉及一种聚合物型酸性滑溜水及其制备方法，由以下原料以质量百分比计组成：酸0.1‑7.5%，耐酸降阻剂0.05‑0.2%，助排剂0.05‑0.5%，粘土稳定剂0.05‑0.5%，余量为水；所述酸为盐酸、有机酸、氢氟酸中的至少一种。本发明的聚合物型酸性滑溜水，采用低浓度的盐酸溶解裂缝表面的部分碳酸盐矿物，在裂缝壁面形成非均匀的刻蚀形态，增强裂缝的导流能力，同时由于滑溜水具有一定的粘度，能有效的将支撑剂输送到裂缝远端，进一步增加裂缝的导流能力，提高对储层的压裂改造效果；本发明的制备方法简单，制备成本低，制得的聚合物型酸性滑溜水对于碳酸盐矿物的储层，伤害小、易返排、携砂能力强，有效实现油气田储层的开采增产。
Description
技术领域
本发明涉及油气田储层改造技术领域，具体涉及一种聚合物型酸性滑溜水及其制备方法。
背景技术
我国页岩气压裂还处于探索阶段，初期所使用的滑溜水压裂液主要是国外石油服务公司提供的技术，国内性能优良的滑溜水压裂液体系报道还较少，尤其是适合于页岩气压裂的降阻剂、粘土稳定剂、表面活性剂等添加剂的研发和评价刚刚起步。
但国外公司提供的滑溜水体系主要是针对美国埋藏较浅的页岩气藏压裂而开发的，直接照搬应用于中国的页岩气藏压裂适应性较差，首先是与国内地层的适应性研究较少，不论添加了何种添加剂，对地层有无伤害拿来就用；其次是国外页岩气埋藏相对较浅，压裂设备先进，对管柱摩阻损耗关心少，而我国页岩气埋藏深，管柱摩阻损耗很大，滑溜水的降摩阻性能对压裂的影响更大；另外国外液体材料费用相当高，加大了压裂综合成本，因此需要针对国内页岩气藏重点区域开展滑溜水压裂液体系的系统研究。
目前国内现场所用滑溜水体系还存在降阻率偏低、表面活性偏差、携砂比低、与目标储层配伍性差、高分子添加剂在地层吸附量大而造成较大伤害等问题，需要开发针对不同页岩气藏适应性和配伍性好的高降阻率滑溜水体系，在相同作业规模的前提下，降阻剂用量降低，现场速配，降低滑溜水压裂液的成本。
因此，本发明提供一种伤害小、易返排、携砂能力强的酸性滑溜水，来实现有效增产。
发明内容
本发明的目的在于克服现有技术的不足，提供一种聚合物型酸性滑溜水及其制备方法，该聚合物型酸性滑溜水具有伤害小、易返排、携砂能力强的酸性滑溜水，有效实现增产。
本发明的目的是通过以下技术方案来实现的：
一种聚合物型酸性滑溜水，由以下原料以质量百分比计组成：
所述酸为盐酸、有机酸、氢氟酸中的至少一种。
进一步地，所述耐酸降阻剂为阴离子型聚丙烯酰胺。
进一步地，所述助排剂是氟碳、OP-10、十二烷基苯磺酸钠、丙醇、异丙醇中的至少一种。
进一步地，所述粘土稳定剂是氯化钾、氯化铵、氯化胆碱、十六烷基三甲基氯化铵中的至少一种。
进一步地，所述聚合物型酸性滑溜水的减阻率为70-80％。
进一步地，所述聚合物型酸性滑溜水的表面张力低于25mN/m，界面张力低于2mN/m，润湿角为75°-90°。
上述聚合物型酸性滑溜水的制备方法，包括以下步骤：依次将酸、耐酸降阻剂、助排剂和粘土稳定剂加入水中，混合搅拌均匀，得到聚合物型酸性滑溜水。
上述的聚合物型酸性滑溜水的应用，用于油气田储层的开采增产。
本发明的有益效果是：本发明的聚合物型酸性滑溜水，一方面采用低浓度的盐酸溶解裂缝表面的部分碳酸盐矿物，在裂缝壁面形成非均匀的刻蚀形态，增强裂缝的导流能力，另一方面，本发明的聚合物型酸性滑溜水具有一定的粘度，可以有效的将支撑剂输送到裂缝远端，进一步增加裂缝的导流能力，提高对储层的压裂改造效果；而且本发明的制备方法简单，制备成本低，制得的聚合物型酸性滑溜水对于含有一定数量的碳酸盐矿物的储层，伤害小、易返排、携砂能力强，有效实现油气田储层的开采增产。
具体实施方式
下面结合具体实施例进一步详细描述本发明的技术方案，但本发明的保护范围不局限于以下所述。
实施例1
一种聚合物型酸性滑溜水及其制备方法，称取94.65％的水，加入5％盐酸，然后均匀缓慢加入0.15％的阴离子型聚丙烯酰胺，搅拌5min，再依次加入0.1％氟碳与异丙醇任意比例的混合物、0.1％的氯化胆碱与氯化铵的任意比例的混合物。
性能评价：
表1酸性滑溜水压裂液性能评价
| 评价内容 | HCl浓度 | 粘度mPa.s | 降阻率 | 表面张力mN/m | 接触角° |
| 评价结果 | 5％ | 3.3 | 71.20％ | 24.1 | 81 |
实施例2
一种聚合物型酸性滑溜水及其制备方法，称取96％的水，加入7％盐酸，然后均匀缓慢加入0.2％的阴离子型聚丙烯酰胺，搅拌10min，再依次加入0.5％OP-10与异丙醇任意比例的混合物、0.3％的十六烷基三甲基氯化铵与氯化铵的任意比例的混合物。
性能评价：
表2酸性滑溜水压裂液性能评价
| 评价内容 | HCl浓度 | 粘度mPa.s | 降阻率 | 表面张力mN/m | 接触角° |
| 评价结果 | 7％ | 3.1 | 73.50％ | 23.4 | 79 |
实施例3
一种聚合物型酸性滑溜水及其制备方法，称取96.05％的水，加入3％盐酸，然后均匀缓慢加入0.1％的阴离子型聚丙烯酰胺，搅拌10min，再依次加入0.5％十二烷基苯磺酸钠与丙醇任意比例的混合物、0.35％的氯化钾
性能评价：
表3酸性滑溜水压裂液性能评价
| 评价内容 | HCl浓度 | 粘度mPa.s | 降阻率 | 表面张力mN/m | 接触角° |
| 评价结果 | 3％ | 4.0 | 70.80％ | 25.6 | 83 |
实施例4
一种聚合物型酸性滑溜水及其制备方法，称取93.05％的水，加入6.5％盐酸，然后均匀缓慢加入0.05％的阴离子型聚丙烯酰胺，搅拌10min，再依次加入0.35％十二烷基苯磺酸钠与丙醇任意比例的混合物、0.05％的氯化钾
性能评价：
表4酸性滑溜水压裂液性能评价
| 评价内容 | HCl浓度 | 粘度mPa.s | 降阻率 | 表面张力mN/m | 接触角° |
| 评价结果 | 6.5％ | 3.8 | 72.60％ | 24.6 | 80 |
实施例5
一种聚合物型酸性滑溜水及其制备方法，称取94.05％的水，加入5.1％盐酸，然后均匀缓慢加入0.2％的阴离子型聚丙烯酰胺，搅拌10min，再依次加入0.15％十二烷基苯磺酸钠与丙醇任意比例的混合物、0.5％的氯化钾
性能评价：
表5酸性滑溜水压裂液性能评价
| 评价内容 | HCl浓度 | 粘度mPa.s | 降阻率 | 表面张力mN/m | 接触角° |
| 评价结果 | 5.1％ | 3.6 | 71.50％ | 24.3 | 82 |
以上所述仅是本发明的优选实施方式，应当理解本发明并非局限于本文所披露的形式，不应看作是对其他实施例的排除，而可用于各种其他组合、修改和环境，并能够在本文所述构想范围内，通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。
Claims (8)
1.一种聚合物型酸性滑溜水，其特征在于，由以下原料以质量百分比计组成：
酸 0.1-7.5%，
耐酸降阻剂 0.05-0.2%，
助排剂 0.05-0.5%，
粘土稳定剂 0.05-0.5%，
余量为水；
所述酸为盐酸、有机酸、氢氟酸中的至少一种。
2.根据权利要求1所述的一种聚合物型酸性滑溜水，其特征在于，所述耐酸降阻剂为阴离子型聚丙烯酰胺。
3.根据权利要求1所述的一种聚合物型酸性滑溜水，其特征在于，所述助排剂是氟碳、OP-10、十二烷基苯磺酸钠、丙醇、异丙醇中的至少一种。
4.根据权利要求1所述的一种聚合物型酸性滑溜水，其特征在于，所述粘土稳定剂是氯化钾、氯化铵、氯化胆碱、十六烷基三甲基氯化铵中的至少一种。
5.根据权利要求1所述的一种聚合物型酸性滑溜水，其特征在于，所述聚合物型酸性滑溜水的减阻率为70-80%。
6.根据权利要求1所述的一种聚合物型酸性滑溜水，其特征在于，所述聚合物型酸性滑溜水的表面张力低于25mN/m，界面张力低于2 mN/m，润湿角为75°-90°。
7.一种如权利要求1-6任意一项所述聚合物型酸性滑溜水的制备方法，其特征在于，包括以下步骤：依次将酸、耐酸降阻剂、助排剂和粘土稳定剂加入水中，混合搅拌均匀，得到聚合物型酸性滑溜水。
8.一种如权利要求1-6任意一项所述的聚合物型酸性滑溜水的应用，其特征在于，用于油气田储层的开采增产。
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