CN107352862A - 耐温型抗水侵凝胶水泥浆 - Google Patents
耐温型抗水侵凝胶水泥浆 Download PDFInfo
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Abstract
本发明公开了一种耐温型抗水侵凝胶水泥浆,包括G级油井水泥、调节剂、缓凝剂、分散剂和填料;G级油井水泥和填料的质量比为1:0.6~1;以G级油井水泥和填料的质量和为基准,调节剂、缓凝剂、分散剂占其质量百分比为8~16%、0~2%和0~1%;调节剂通过如下方法制得:先将氢氧化钠溶于水中,散热后,加入单体,除氧后,加入引发剂,在50~65℃条件下反应3~4h,冷却至室温;其中,单体为N,N二甲基丙烯酰胺单体、丙烯酰胺单体、2‑丙烯酰胺基‑2‑甲基丙磺酸单体和丙烯酸单体的混合物。该水泥浆在高温下具有很好的抗水稀释能力,在水中不易分散,不易被地层水污染,可根据施工时间调节水泥浆稠化时间,封堵地层。
Description
技术领域
本发明属于石油钻井工程、煤层气工程领域,特别是涉及一种耐温型抗水 侵凝胶水泥浆。
背景技术
目前,油田在堵水调剖、层漏所用堵剂主要存在下列问题:1)有机堵剂的 封堵浆体固结后强度不佳,抗温能力不够,有效期短;而强度大、封堵效果好 的堵剂成本高,不适合大剂量封堵施工。2)无机堵剂中的石灰乳成本低,是国 内最通用的技术,但石灰乳在水中易被水冲释,抗水侵能力差,反应时间不易 控制,颗粒大易沉降井底,对储层伤害性较大;超细水泥存在波及体积小,施 工安全不好保证的技术难点,不能有效地驻留在封堵层位,堵剂替至目的层后 未凝固前就已漏失掉,造成堵浆注入量大,施工时间长。
在钻井过程中经常遇到地层中存在暗河、断层放空等情况,造成严重漏失。 解决这种漏失问题,常规钻井液堵漏无效,水泥堵漏因易被稀释,也会发生堵 漏失败。一旦堵漏失败,一是造成钻井复杂,二是有的暗河和当地水源相通, 会造成污染引起环保事故。
在井下作业水泥打塞封堵目的层时,由于井下存在地层水、盐水层或已被 污染水源,水泥浆在泵送过程中易被冲释、稀释,可能对水泥浆造成污染导致 水泥浆长时间不凝固,需要进一步打二次塞,甚至打三次塞,增加施工周期。
发明内容
为了解决上述技术问题,本发明提供一种耐温型抗水侵凝胶水泥浆,该耐 温型抗水侵凝胶水泥浆在高温下具有很好的抗水稀释能力,在水中不易分散, 不易被污染,可根据施工时间调节水泥浆稠化时间,封堵地层。
为此,本发明的技术方案如下:
一种耐温型抗水侵凝胶水泥浆,包括G级油井水泥、调节剂、缓凝剂、分 散剂和填料;
所述G级油井水泥和填料的质量比为1:0.6~1;
以所述G级油井水泥和填料的质量和为基准,所述调节剂、缓凝剂、分散 剂占其质量百分比分别为8~16%、0.5~2%和0~1%。
进一步,所述填料为高炉矿渣、粉煤灰、微珠、坂土和增强剂PZW中的一 种或任意两种的混合物。
进一步,所述调节剂通过如下方法制得:
1)将氢氧化钠溶于水中,散热后,得到氢氧化钠水溶液;
2)将单体溶解于氢氧化钠水溶液中,除氧后,加入引发剂,在50~65℃条 件下反应3~4h,冷却至室温,即得调节剂;
其中,所述单体为N,N二甲基丙烯酰胺单体、丙烯酰胺单体、2-丙烯酰胺 基-2-甲基丙磺酸单体和丙烯酸单体的混合物;
所述N,N二甲基丙烯酰胺单体的质量占所述单体质量的50~60%;
所述丙烯酰胺单体的质量占所述单体质量的5~12%;
所述2-丙烯酰胺基-2-甲基丙磺酸单体的质量占所述单体质量的18~22%;
所述丙烯酸单体的质量占所述单体总质量的15~17%;
所述引发剂的质量为所述单体质量的0.3~0.5%;优选,引发剂是氧化-还 原体系:过硫酸钾-偏重亚硫酸钠(摩尔比为1:0.5~0.8);
所述氢氧化钠水溶液中,所述氢氧化钠的物质的量为所述2-丙烯酰胺基-2- 甲基丙磺酸单体和丙烯酸单体的物质的量之和;
水的质量为所述单体质量的2.5~3倍。
进一步,所述缓凝剂为多羟基羧酸和磺酸盐的混合物,耐温180℃,具体可 以为中国石油渤海钻探工程技术研究院生产的ZH-6型缓凝剂。
进一步,所述分散剂为磺化丙酮-甲醛缩聚物,购自河南省卫辉市油田化学 有限公司。
本申请提供的技术方案是从油井水泥角度出发,为提高水泥浆在高温段的 抗水侵能力研发一种在水中不易分散的堵水堵漏专用凝胶水泥浆体系。该水泥 浆体系在高温下具有很好的抗水稀释能力,在水中不易分散,不易被污染,可 根据施工时间调节水泥浆稠化时间,封堵地层。
工作原理:该凝胶水泥通过研发一种耐温型调节剂,利用其增加水泥浆在 高温下的粘度,来提高水泥浆在高温下的抗水侵性能,使油井水泥、填料及其 它助剂所形成的凝胶水泥浆体系在100℃~160℃具有很好的锁水性,在水中不 易被水冲释。
具体实施方式
以下结合实施例对本发明的技术方案进行详细描述。
实施例1
调节剂的制备:先将氢氧化钠12.18g溶于250mL水中,散热后将N,N二甲 基丙烯酰胺单体60g、丙烯酰胺单体5g、2-丙烯酰胺基-2-甲基丙磺酸单体20g、 丙烯酸单体15g溶于氢氧化钠水溶液中,搅拌除氧,在55℃下加入氧化-还原引 发剂体系(过硫酸钾0.3g,偏重亚硫酸钠0.11g)反应3h冷却至室温。
耐温型抗水侵凝胶水泥浆1:
G级油井水泥250g+粉煤灰250g+本实施例制得的调节剂40g+水275mL+表 1中质量的缓凝剂,缓凝剂选用中国石油渤海钻探工程技术研究院生产的ZH-6 型缓凝剂。
表1实施例1中耐温型抗水侵凝胶水泥浆1性能测试结果
耐温型抗水侵凝胶水泥浆2:
G级油井水泥155g+超细矿渣155g+坂土40g+本实施例得到的调节剂55g+ 水500mL
表2实施例1中凝胶水泥浆配方2性能测试结果
实施例2
调节剂的制备:先将氢氧化钠13.49g溶于300mL水中,散热后将N,N二甲 基丙烯酰胺单体50g、丙烯酰胺单体12g、2-丙烯酰胺基-2-甲基丙磺酸单体21g、 丙烯酸单体17g溶于氢氧化钠水溶液中,搅拌除氧,在60℃下加入氧化-还原引 发剂体系(过硫酸钾0.3g,偏重亚硫酸钠0.11g)反应3.5h冷却至室温。
耐温型抗水侵凝胶水泥浆3:
G级油井水泥360g+微珠80g+增强剂PZW40g+本实施例制得的调节剂40g+ 分散剂4.8g+水272mL+表3中质量的缓凝剂,缓凝剂选用中国石油渤海钻探工 程技术研究院生产的ZH-6型缓凝剂。
表3实施例2中耐温型抗水侵凝胶水泥浆3性能测试结果
以实施例2制得的调节剂为例,调节剂加量变化对凝胶水泥浆性能的影响:
耐温型抗水侵凝胶水泥浆4:
G级油井水泥250g+粉煤灰250g+本实施例制得的调节剂0~40g+水 272mL+缓凝剂6g,缓凝剂选用中国石油渤海钻探工程技术研究院生产的ZH-6 型缓凝剂。
表4实施例2中耐温型抗水侵凝胶水泥浆4性能测试结果
调节剂加量对凝胶水泥性能影响主要是体系的抗水侵性能,不加调节剂, 水泥浆体系没有抗水侵效果,遇水则呈云雾状分散开,加入调节剂后水泥浆体 系即为凝胶水泥浆体系具有一定的抗水侵效果,调节剂加量越大抗水侵性能越 优良,但同时凝胶水泥浆的流动性能变差,现场施工要兼顾水泥浆的抗水侵性 能又要使水泥浆体具有较好的流动性,所以调节剂的加量要控制在合理范围内, 以实施例2制得的调节剂为例,调节剂加量占油井水泥及填料总重的6~8%、 水泥浆体流动度控制在≥18cm最佳。
Claims (9)
1.一种耐温型抗水侵凝胶水泥浆,其特征在于:包括G级油井水泥、调节剂、缓凝剂、分散剂和填料;
所述G级油井水泥和填料的质量比为1:0.6~1;
以所述G级油井水泥和填料的质量和为基准,所述调节剂、缓凝剂、分散剂占其质量百分比分别为8~16%、0~2%和0~1%;
所述调节剂通过如下方法制得:
1)将氢氧化钠溶于水中,散热后,得到氢氧化钠水溶液;
2)将单体溶解于氢氧化钠水溶液中,除氧后,加入引发剂,在50~65℃条件下反应3~4h,冷却至室温,即得调节剂;
其中,所述单体为N,N二甲基丙烯酰胺单体、丙烯酰胺单体、2-丙烯酰胺基-2-甲基丙磺酸单体和丙烯酸单体的混合物。
2.如权利要求1所述耐温型抗水侵凝胶水泥浆,其特征在于:所述N,N二甲基丙烯酰胺单体的质量占所述单体质量的50~60%;
所述丙烯酰胺单体的质量占所述单体质量的5~12%;
所述2-丙烯酰胺基-2-甲基丙磺酸单体的质量占所述单体质量的18~22%;
所述丙烯酸单体的质量占所述单体总质量的15~17%。
3.如权利要求1所述耐温型抗水侵凝胶水泥浆,其特征在于:所述引发剂的质量为所述单体质量的0.3~0.5%。
4.如权利要求1所述耐温型抗水侵凝胶水泥浆,其特征在于:所述引发剂是氧化-还原体系:过硫酸钾-偏重亚硫酸钠,过硫酸钾与偏重亚硫酸钠的摩尔比为1:0.5~0.8。
5.如权利要求1所述耐温型抗水侵凝胶水泥浆,其特征在于:所述氢氧化钠水溶液中,所述氢氧化钠的物质的量为所述2-丙烯酰胺基-2-甲基丙磺酸单体和丙烯酸单体的物质的量之和;
水的质量为所述单体质量的2.5~3倍。
6.如权利要求1~5中任意一项所述耐温型抗水侵凝胶水泥浆,其特征在于:所述填料为高炉矿渣、粉煤灰、微珠、坂土和增强剂PZW中的一种或任意两种的混合物。
7.如权利要求1~5中任意一项所述耐温型抗水侵凝胶水泥浆,其特征在于:所述缓凝剂为多羟基羧酸和磺酸盐的混合物,耐温180℃。
8.如权利要求7中所述耐温型抗水侵凝胶水泥浆,其特征在于:所述缓凝剂为中国石油渤海钻探工程技术研究院生产的ZH-6型缓凝剂。
9.如权利要求1~5中任意一项所述耐温型抗水侵凝胶水泥浆,其特征在于:所述分散剂为磺化丙酮-甲醛缩聚物。
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