CN1004210B - 钛冻胶水基压裂液 - Google Patents

钛冻胶水基压裂液 Download PDF

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CN1004210B
CN1004210B CN 85105346 CN85105346A CN1004210B CN 1004210 B CN1004210 B CN 1004210B CN 85105346 CN85105346 CN 85105346 CN 85105346 A CN85105346 A CN 85105346A CN 1004210 B CN1004210 B CN 1004210B
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titanium
glue
fracturing liquid
water
agent
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CN85105346A (zh
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赵福麟
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EAST CHINA PETROLEUM COLLEGE
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EAST CHINA PETROLEUM COLLEGE
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Abstract

本发明是属于水基压裂液配方的改进，它是采用了无机钛化合物作为交联剂，既可在碱性条件下，也可在酸性条件下与成胶剂交联出粘弹性极好的钛冻胶，这种钛冻胶压裂液粘度高，摩阻低，破胶水化后无残渣，而且在破胶水化后，无机钛化合物又是一种良好的粘土防膨剂，该发明的压裂液不仅适用于粘土含量高的地层，而且由于无机钛化合物(如四氯化钛等)，货源广、便宜易得，所以在该发明的降阻性能都达到或超过硼冻胶压裂液的指标时，其成本可降低5～16％。

Description

本发明是属于水基压裂液配方的改进。
压裂可使油井增产、水井增注。通常使用的压裂液分为两大种类，其一是油基压裂液，其二是水基压裂液。前类压裂液适用于压裂油井，保护油层，特别适用于粘土含量高的地层。但它的价格昂贵，并且不安全(易燃)。后一类压裂液便宜、安全，只要配方得当，可用于压裂油井、水井。这后一类压裂液主要是指水基冻胶压裂液，它不但粘度高、摩阻低，能在指定时间破胶水化，而且水化后粘度低，便于排液。其缺点是不适用于粘土含量高的地层，尤其是碱性的水基冻胶压裂液，破胶水化后会使地层的粘土膨胀，从而减少地层的渗透率，影响压裂效果。在现场中，曾用过各类水基冻胶压裂液，如硼冻胶、钡冻胶和铝冻胶，而以硼冻胶的使用为最多。这种硼冻胶虽然易于交联，所产生的冻胶具有极好的粘弹性，而且成胶剂和交联剂都便宜易得。但是，其最大的缺点是破胶水化后有大量残渣堵塞地层，且破胶后的残液(由于是碱性交联)会引起粘土膨胀，影响压裂效果。1971年以来，国外在高温地层也用过钛冻胶压裂液，但是，所采用的交联剂是价格昂贵的有机钛。
本发明的目的就是针对上述碾冻胶压裂液的缺点，用一种新型的交联剂，在酸性条件下将聚丙烯酰胺交联起来，为压裂粘土含量高的油层提供一种高粘度、低摩阻、能在指定时间破胶水化，水化后残液粘度低，无残渣，并且有粘土防膨性能和与油不乳化的优质压裂液。本发明所说的新型交联剂是指四氯化钛(TiCl4)、硫酸钛(Ti(SO4)2)和硫酸亚钛(Ti2(SO4)3)等无机钛化合物。它们可在酸性条件(最佳范围pH值为3～4)下交联未水解或低水解度的聚丙烯酰胺，产生如同硼冻胶那样粘弹性好的冻胶。这种无机钛化合物(如TiCl4)在压裂液作为携砂液时是交联剂，在破胶水化后，它又是一种粘土防膨剂，能有效地抑制粘土的膨胀。
在交联前，应将钛交联剂的乙醇溶液(预先将钛交联剂溶解于乙醇)用水稀释至所需浓度，即1～5％(重)，然后再与浓度为0.4～0.5％(重)的成交剂聚丙烯酰胺(分子量＞300万)相交联，其体积比为1～4∶100。交联后所得冻胶的降阻性能均可达到0.7～0.8％(重)的田菁粉-硼砂冻胶所达的指标，而且在原配方中加入0.01～0.05％(重)的氧化剂(如K2S2O8等)，可使该冻胶在指定的时间破胶水化。水化后，残液中无残渣，此时的无机钛化合物又是一种粘土防膨剂。
无机钛化合物(如TiCl4)便宜易得，采用上述配方不仅可达到和超过田菁粉-硼砂冻胶压裂液的各种性能，而且还可使成本费用降低5～16％。

Claims (4)

1.一种用于在指定时间内水化、水化后残液粘度低、无残渣的含无机钛交联剂、聚丙烯酰胺、氧化剂等的钛冻胶水基压裂液，其特征在于：(1)钛交联剂的乙醇溶液，用水稀释至浓度为1～5％(重)；(2)成胶剂聚丙烯酰胺的体系浓度为0.4～05％(重)；(3)稀释后的钛交联剂乙醇溶液与成胶剂溶液按1～4∶100(体积)混合；(4)氧化剂(如K2S2O8)的体系浓度0.01～0.05％(重)。
2.按权利要求1所述的无机钛交联剂，其特征在于钛交联剂为四氧化钛、硫酸钛、硫酸亚钛。
3.按权利要求1所述的成胶剂聚丙烯酰胺，其特征在于在酸性条件下进行交联的成交剂聚丙烯酰胺的分子量大于300万。
4.按根据权利要求1所述的钛交联剂乙醇溶液，其特征是其配制方法为：将钛交联剂溶于乙醇后，再在使用前用水稀释至所需浓度，为1～5％(重)。
CN 85105346 1985-07-05 1985-07-05 钛冻胶水基压裂液 Expired CN1004210B (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046211C (zh) * 1992-09-16 1999-11-10 北海道电力株式会社 废气的处理工艺
CN101353568B (zh) * 2008-09-03 2010-04-14 成都理工大学 苦苈豆植物胶型环保泥浆及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1323127C (zh) * 2004-09-27 2007-06-27 克拉玛依新科澳化工有限公司 高聚物压裂液及其配制方法
CN1329474C (zh) * 2005-06-17 2007-08-01 甘肃省庆阳长庆井下化工厂 醇基压裂液
CN102071004B (zh) * 2010-12-07 2013-12-11 大庆油田有限责任公司 一种低聚物酸性压裂液
CN110862814A (zh) * 2019-11-26 2020-03-06 新疆力科石油化工技术服务有限公司 一种胍胶压裂液有机钛交联剂及其制备方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046211C (zh) * 1992-09-16 1999-11-10 北海道电力株式会社 废气的处理工艺
CN101353568B (zh) * 2008-09-03 2010-04-14 成都理工大学 苦苈豆植物胶型环保泥浆及其制备方法

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