CN103952129B - 一种油气井固井水泥环自修复液及其制备与应用 - Google Patents
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Abstract
一种油气井固井水泥环自修复液,由无机水性水泥密封防水剂、三异丙醇胺、醋酸钙、渗透剂JFC和清水组成,按比例混合溶解后,可用于油气井固井水泥环的自修复,本发明油气井固井水泥环自修复液能够对固井水泥环损伤如微裂缝和微间隙进行自动修复,从而油气井固井水泥环和储气库水泥塞的耐久性和完整性。
Description
技术领域
本发明属于石油钻井技术领域,特别涉及一种油气井固井水泥环自修复液及其制备与应用。
背景技术
油气井固井水泥环和建筑上的水泥基材料一样是一种易收缩的脆性材料,再加上各种试井、测试、投产、生产作业和地层条件的影响,使套管和水泥环受到温度、压力等各种因素大幅度变化的影响和井下各种酸性流体(如二氧化碳、硫化氢等)的腐蚀,不可避免地会在水泥环内部产生微裂缝,在固井水泥环与地层井壁的胶结界面产生微间隙,造成油气井固井水泥环损伤,使固井水泥环的封隔功能失效,引起油气井井口井窜气、地下天然气和有毒气体泄露等一系列严重的开发问题。
发明内容
为了克服上述现有技术的缺点,本发明的目的在于提供一种油气井固井水泥环自修复液及其制备与应用,可保证天然气田安全高效的开发、天然气井环空带压固井水泥环的完整性与耐久性,实现固井水泥环损伤的自修复,解决了浅层油气井防气窜、对固井水泥环损伤的自修复和耐久性问题。
为了实现上述目的,本发明采用的技术方案是:
一种油气井固井水泥环自修复液,由如下重量份的组份组成:
所述无机水性水泥密封防水剂为杭州固特化工有限公司型号为HM1500的商品。
优选地,所述无机水性水泥密封防水剂为10份,三异丙醇胺为4份,醋酸钙为1.0份,渗透剂JFC为0.5份。
该油气井固井水泥环自修复液的制备方法是将所述组份按比例混合搅拌溶解即成。
该油气井固井水泥环自修复液的应用,对于要求水泥浆返到地面的油气井,待固井施工完成水泥浆泛出地面时,将井口到套间30m-50m环空的固井水泥浆用清水冲洗出来,然后注入所述的油气井固井自修复液,保持自修复液在套间环空有30-50m的高度,使自修复前置液置于固井水泥浆上部,能够随时发挥自修复固井前置液的自修复性能,还便于今后补充自修复固井前置液。
而对发生井口窜气,固井水泥浆已返到地面的天然气生产井,首先将天然气井井口压力卸掉,然后将装有所述油气井固井水泥环自修复液的高压密封容器连接到天然气井的套间窜气环空,使用泵车将自修复液挤入井口的窜气套间水泥环,施工时保持挤入压力高于当时的井口带压值3~5MPa,施工后保留自修复液高压容器,保持挤入压力高于当时的井口带压值3~5MPa,憋压养护时间保持一个月以上,如果养护过程中压力减小,则及时补压。
当水泥环完好时,放置在固井水泥环上部的自修复液的活性化学物质处于休眠状态;而当水泥环发生损伤时,自修复液通过渗透作用,使其特殊的活性化学物质在窜气通道(微裂缝或微间隙)中传输,形成不溶性的化学晶体,同时激活损伤部位的未水化物质参与反应,胶结密闭损伤部位,实现对固井水泥环的损伤的自动修复。
与现有技术相比,本发明的有益效果是:
(1)油气井固井水泥环自修复液能够渗透到微裂缝和微间隙中通过化学反应形成结晶产物,密闭窜气通道,提高试样的抗气窜强度,对固井水泥环损伤有较好的自修复效果,而且作用效果持久稳定,能够解决天然气井固井气窜和投产后套间带压的问题。
(2)自修复前置液对套管没有腐蚀作用,而且能够保护套管。
(3)固井自修复前置液配制简单,施工方便,对现有的固井和天然气井生产工艺和设备没有任何特殊要求,是提高天然气井和储气库气井固井质量,保证天然气井耐久性和完整性的一个实用技术。
具体实施方式
下面结合实施例详细说明本发明的实施方式。
实施例一
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂10份,三异丙醇胺4份,醋酸钙1.0份,渗透剂JFC0.5份,以及清水100份。
所述油气井固井水泥环自修复液的制备方法和使用方法,步骤如下:
制备:将所述材料按规定比例加入清水中混合溶解,配制成油气井固井水泥环自修复液。
应用:对于要求水泥浆返到地面的油气井,待固井施工完成水泥浆泛出地面时,立即将井口到套间30m-50m环空的固井水泥浆用清水冲洗出来,然后注入所述的油气井固井自修复液,保持自修复液在套间环空有30-50m的高度,使自修复前置液置于固井水泥浆上部,能够随时发挥自修复固井前置液的自修复性能,还便于今后补充自修复固井前置液。
而对发生井口窜气,固井水泥浆已返到地面的天然气生产井,首先将天然气井井口压力卸掉,然后将装有所述油气井固井水泥环自修复液的高压密封容器连接到天然气井的套间窜气环空,使用泵车将自修复液挤入井口的窜气套间水泥环,施工时保持挤入压力高于当时的井口带压值3~5MPa。施工后保留自修复液高压容器,保持挤入压力高于当时的井口带压值3~5Mpa,憋压养护时间保持一个月以上,如果养护过程中压力减小,应及时补压。
实施例二
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂12份,三异丙醇胺2份,醋酸钙0.5份,渗透剂JFC0.5份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
实施例三
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂10份,三异丙醇胺0份,醋酸钙0份,渗透剂JFC0份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
实施例四
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂10份,三异丙醇胺3份,醋酸钙0份,渗透剂JFC0份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
实施例五
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂10份,三异丙醇胺2份,醋酸钙0份,渗透剂JFC0.5份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
实施例六
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂20份,三异丙醇胺3份,醋酸钙0.5份,渗透剂JFC0.5份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
实施例七
一种油气井固井水泥环自修复液,由以下组份(重量份)组成:
无机水性水泥密封防水剂13份,三异丙醇胺0份,醋酸钙0份,渗透剂JFC0份,以及清水100份。
上述油气井固井水泥环自修复液的制备方法与应用方法,参照实施例一。
以上实施例中,无机水性水泥密封防水剂为杭州固特化工有限公司型号为HM1500的商品,为一种含有高效催化剂和载体等复合型的纳米防水剂,具有极强的渗透能力,其常规使用包括建筑防水工程,机场跑道、高速公路、桥梁等混凝土工程中作为增强剂、密封剂和抗浸蚀剂使用。
能渗入混凝土内部(3cm以上)与碱类物质起化学作用,生成不溶于水的凝胶体,填补混凝土内部细小微孔和缝隙,封闭毛细孔道。三异丙醇胺主要用于水泥外加剂,一是提高球磨效率,二是增加水泥强度。三异丙醇胺因其空间立体的分子结构,在体系中具有很强的分散性能;渗透剂JFC是脂肪醇聚氧乙烯醚,属非离子表面活性剂,起渗透作用,具有固定的亲水亲油基团,在溶液的表面能定向排列,并能使表面张力显著下降;所述醋酸钙即乙酸钙,在体系中是一种螯合剂、稳定剂和防腐剂。
Claims (5)
1.一种油气井固井水泥环自修复液,其特征在于,由如下重量份的组份组成:
2.根据权利要求1所述的油气井固井水泥环自修复液,其特征在于,所述无机水性水泥密封防水剂为杭州固特化工有限公司型号为HM1500的商品。
3.制备权利要求1所述油气井固井水泥环自修复液的方法,其特征在于,将所述组份按比例混合搅拌溶解即成。
4.权利要求1所述的油气井固井水泥环自修复液的应用,对于要求水泥浆返到地面的油气井,其特征在于,待固井施工完成水泥浆泛出地面时,将井口到套间30m-50m环空的固井水泥浆用清水冲洗出来,然后注入所述的油气井固井自修复液,保持自修复液在套间环空有30-50m的高度,使自修复前置液置于固井水泥浆上部,能够随时发挥自修复固井前置液的自修复性能,还便于今后补充自修复固井前置液。
5.权利要求1所述的油气井固井水泥环自修复液的应用,对发生井口窜气,固井水泥浆已返到地面的天然气生产井,其特征在于,首先将天然气井井口压力卸掉,然后将装有所述油气井固井水泥环自修复液的高压密封容器连接到天然气井的套间窜气环空,使用泵车将自修复液挤入井口的窜气套间水泥环,施工时保持挤入压力高于当时的井口带压值3~5MPa,施工后保留自修复液高压容器,保持挤入压力高于当时的井口带压值3~5Mpa,憋压养护时间保持一个月以上,如果养护过程中压力减小,则及时补压。
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CN1896176A (zh) * | 2006-06-28 | 2007-01-17 | 大庆油田有限责任公司 | 低温油层炮眼封堵剂 |
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