CN109134776B - 一种现用现配型耐盐胶塞及其制备方法 - Google Patents
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Abstract
本发明公开了一种现用现配型耐盐胶塞及其制备方法,其中,该胶塞由酚醛体系、催化剂体系、共聚物溶液体系和盐水体系组成,酚醛体系由苯酚、间苯二酚和甲醛溶液组成,催化剂体系由氢氧化钠、三乙醇胺和蒸馏水组成,共聚物溶液体系由丙烯酰胺/2‑丙烯酰胺‑2‑甲基丙磺酸共聚物和氯化钠溶液组成,盐水体系为矿化度不高于250000mg/L的氯化钠和氯化钙混合溶液。本发明的有益之处在于:(1)各体系是分开包装的,并且酚醛体系可以在室温下长期储存,现用现配,使用起来很方便,也避免了不必要的浪费;(2)胶塞的耐盐性和强度都得到了提升。
Description
技术领域
本发明涉及一种胶塞及其制备方法,具体涉及一种现用现配型耐盐胶塞及其制备方法,属于油田化学技术领域。
背景技术
油藏开发过程中,因套管漏失所引起的生产问题,造成了巨大的经济损失。
与调剖堵水作业不同,套管堵漏作业需要堵漏剂有更高的封堵强度。树脂类堵漏体系有良好的封堵强度,常用作套管堵漏。
树脂类堵漏体系分为:油溶性树脂堵漏体系、水溶性树脂堵漏体系。在矿场应用过程中,油溶性树脂堵漏体系成本较高,现场施工困难;水溶性树脂堵漏体系在室温下储存时间较短,并且在高矿化度水中溶解度较低,这严重限制了水溶性树脂堵漏体系作为套管堵漏剂的应用。
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以在室温下长期储存的现用现配型耐盐胶塞及其制备方法。
为了实现上述目标,本发明采用如下的技术方案:
一种现用现配型耐盐胶塞,其特征在于,由酚醛体系、催化剂体系、共聚物溶液体系和盐水体系组成,其中:
前述酚醛体系由苯酚、间苯二酚和甲醛溶液组成;
前述催化剂体系由氢氧化钠、三乙醇胺和蒸馏水组成;
前述共聚物溶液体系由丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物和氯化钠溶液组成;
前述盐水体系为矿化度不高于250000mg/L的氯化钠和氯化钙混合溶液。
前述的现用现配型耐盐胶塞,其特征在于,在前述酚醛体系中,甲醛溶液的质量浓度为37%,苯酚占酚醛体系总质量的20%~25%,甲醛溶液占酚醛体系总质量的70%,余量为间苯二酚。
前述的现用现配型耐盐胶塞,其特征在于,在前述催化剂体系中,氢氧化钠占催化剂体系总质量的40%,三乙醇胺占催化剂体系总质量的10%,余量为蒸馏水。
前述的现用现配型耐盐胶塞,其特征在于,在前述共聚物溶液体系中,前述氯化钠溶液的浓度为100g/L,丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物的质量浓度为10%。
前述的现用现配型耐盐胶塞的制备方法,其特征在于,包括以下步骤:
Step1:将酚醛体系与催化剂体系混合,室温下放置12h以上;
Step2:调节混合溶液的pH至7;
Step3:将混合溶液与共聚物溶液体系、盐水体系混合;
Step4:加热,直至成胶。
前述的制备方法,其特征在于,在Step1中,前述酚醛体系的制备方法为:先将苯酚和间苯二酚在50℃下加热溶解,然后加入甲醛溶液,混合均匀,最后置于室温条件下老化60d。
前述的制备方法,其特征在于,在Step1中,酚醛体系与催化剂体系按照质量比10:1混合。
前述的制备方法,其特征在于,在Step3中,混合溶液与共聚物溶液体系、盐水体系按照质量比4:5:1混合。
前述的制备方法,其特征在于,在Step4中,加热温度为100℃-150℃。
本发明的有益之处在于:
(1)各体系是分开包装的,并且酚醛体系可以在室温下长期储存,现用现配,所以使用起来很方便,并且也避免了不必要的浪费;
(2)酚醛体系和催化剂体系混合后可在短时间内生成交联剂,并且生成的交联剂可在中性条件下溶于高矿化度盐水,这使得胶塞的耐盐性得到提升;
(3)交联剂与共聚物溶液体系混合后可在加热状态下生成高强度胶塞,胶塞强度得到提升。
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。
一、现用现配型耐盐胶塞
本发明提供的现用现配型耐盐胶塞由酚醛体系、催化剂体系、共聚物溶液体系和盐水体系组成。
1、酚醛体系
酚醛体系由苯酚、间苯二酚和甲醛溶液组成,甲醛溶液的质量浓度为37%,苯酚占酚醛体系总质量的20%~25%,甲醛溶液占酚醛体系总质量的70%,余量为间苯二酚。
在本实施例中,我们取苯酚10g、间苯二酚2g、质量浓度为37%的甲醛溶液28g。
制备方法:先将苯酚和间苯二酚在50℃下加热溶解,然后加入甲醛溶液,混合均匀,最后置于室温条件下老化60d。
该酚醛体系可以在室温下长期储存,保质期较长,使用起来很方便,并且也避免了不必要的浪费。
2、催化剂体系
催化剂体系由氢氧化钠、三乙醇胺和蒸馏水组成,氢氧化钠占催化剂体系总质量的40%,三乙醇胺占催化剂体系总质量的10%,余量为蒸馏水。
在本实施例中,我们取氢氧化钠1.6g、三乙醇胺0.4g、蒸馏水2g。
3、共聚物溶液体系
共聚物溶液体系由丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物和氯化钠溶液组成,氯化钠溶液的浓度为100g/L,丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物的质量浓度为10%。
在本实施例中,我们取浓度为100g/L的氯化钠溶液63g、丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物7g。
4、盐水体系
盐水体系为矿化度不高于250000mg/L的氯化钠和氯化钙混合溶液。
以上4个体系是分开包装的,并且酚醛体系可以在室温下长期储存,现用现配,所以使用起来很方便,并且也避免了不必要的浪费。
二、制备方法
本发明提供的现用现配型耐盐胶塞的制备方法如下:
Step1:一次混合
将酚醛体系与催化剂体系按照质量比10:1混合,室温下放置12h以上,一般放置12h-24h比较合适。在本实施例中,我们室温下放置了18h。
酚醛体系和催化剂体系混合后,在短时间内生成了交联剂,并且经试验验证生成的交联剂在中性条件下溶于高矿化度盐水,这使得胶塞的耐盐性得到了提升。
Step2:调pH
向上述混合溶液中加入醋酸,调节混合溶液的pH至7。
Step3:二次混合
将调完pH的上述混合溶液与共聚物溶液体系、盐水体系按照质量比4:5:1混合,得到胶塞体系。
Step4:加热成胶
将上述胶塞体系置于100℃以上烘箱中加热,直至成胶。加热温度控制在100℃-150℃范围内比较合适,用时大约3h-6h。
在本实施例中,加热温度我们选用的是100℃,6h后体系成胶。
混合溶液中的交联剂与共聚物溶液混合后,在高温下可生成高强度胶塞,胶塞强度得到提升。
三、应用
采用本发明提供的方法制备得到的胶塞,主要用于高温高盐井的堵漏作业。
使用方法:将酚醛体系与催化剂体系按照质量比10:1混合,室温下放置18h,然后调节混合溶液的pH至7,将调完pH的上述混合溶液与共聚物溶液体系、盐水体系按照质量比4:5:1混合,得到胶塞体系,使用平流泵以0.5ml/min的流速将上述胶塞体系注入内径为2.5cm的填砂管中,然后将填砂管两端密封,并置于100℃的烘箱中加热,6h后体系成胶。
之后,我们使用平流泵以0.5ml/min的流量继续注水,测得注入水突破时的压差为7.2MPa。
可见,采用本发明提供的方法生成了高强度的胶塞,胶塞强度得到提升。
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 (2)
1.一种现用现配型耐盐胶塞,其特征在于,由酚醛体系、催化剂体系、共聚物溶液体系和盐水体系组成,其中:
所述酚醛体系由苯酚、间苯二酚和甲醛溶液组成,其中,甲醛溶液的质量浓度为37%,苯酚占酚醛体系总质量的20%~25%,甲醛溶液占酚醛体系总质量的70%,余量为间苯二酚;
所述催化剂体系由氢氧化钠、三乙醇胺和蒸馏水组成,其中,氢氧化钠占催化剂体系总质量的40%,三乙醇胺占催化剂体系总质量的10%,余量为蒸馏水;
所述共聚物溶液体系由丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物和氯化钠溶液组成,其中,氯化钠溶液的浓度为100g/L,丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸共聚物的质量浓度为10%;
所述盐水体系为矿化度不高于250000mg/L的氯化钠和氯化钙混合溶液;
各体系的混合比例如下:酚醛体系与催化剂体系按照质量比10:1混合,得到混合溶液;混合溶液与共聚物溶液体系、盐水体系按照质量比4:5:1混合。
2.权利要求1所述的现用现配型耐盐胶塞的制备方法,其特征在于,包括以下步骤:
Step1:将酚醛体系与催化剂体系按照质量比10:1混合,室温下放置12h以上,其中,所述酚醛体系的制备方法为:先将苯酚和间苯二酚在50℃下加热溶解,然后加入甲醛溶液混合均匀,之后置于室温条件下老化60d;
Step2:调节混合溶液的pH至7;
Step3:将混合溶液与共聚物溶液体系、盐水体系按照质量比4:5:1混合;
Step4:加热,直至成胶,其中,加热温度为100℃-150℃。
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