CN108240183A - 用于钻井井壁加固的无机质、有机质杂化薄膜的实施工艺 - Google Patents
用于钻井井壁加固的无机质、有机质杂化薄膜的实施工艺 Download PDFInfo
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Abstract
本发明提供一种用于井壁加固的无机质、有机质杂化薄膜的实施工艺,按下述步骤进行:在三个储液罐中分别配制纳米颗粒悬浊液、阳离子聚合物溶液、阴离子聚合物溶液,质量百分比均为0.1%~0.2%wt;然后在三个储液罐中分别加入质量百分比为0.1~0.5%wt流体滞留剂,并搅拌均匀;再后按照阳离子聚合物溶液、阴离子聚合物溶液、阳离子聚合物溶液、纳米颗粒悬浊液的顺序把上述液体泵送入井眼内,每种液体的泵入体积为1~3m3,然后停顿5分钟,此为一个循环;经过8~15个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。本发明的工艺,在钻井井壁上形成致密、坚固的表面膜,用于对井壁进行加固,拓宽钻井液的安全密度窗口,保障钻井安全。
Description
技术领域
本发明涉及化学及石油钻井领域,特别涉及一种用于井壁加固的无机质、有机质杂化薄膜的现场实施工艺。
背景技术
在油气钻探过程中,井壁稳定是广泛存在的问题。井壁失稳易造成井壁垮塌、缩径、漏失、卡钻及储层污染等井下复杂情况和事故,不仅会拖延钻井周期,增加钻井成本,也会影响后续采油作业。严重时还可能使部分井眼报废甚至使整个井眼报废。造成井壁失稳的因素概括起来可分为三大类,包括地质、钻井液物理和化学、钻井作业等因素。改变钻井液的特性是目前井壁稳定的最主要手段之一,而形成致密而坚韧的泥饼则是保障井壁稳定的关键因素。
实际上,自然界中的生物体利用极其普通的矿化材料(如碳酸钙或磷酸钙等)和少量有机基质来制备了其结构支撑的硬组织,从细菌中的磁性体到贝壳、珊瑚、骨骼和牙齿等。这些生物矿化材料为无机/有机复合材料,由于具有规则的结构,因此与常规无机材料相比,具有了一些不可比拟的优点,如极高的强度、良好的断裂韧性、优异的减震性能以及许多其它的特殊功能。因此,可以利用这种无机质、有机质杂化生成的薄膜,来改变泥饼或井壁周围沉积层的微观结构和力学性能,以此提高井壁稳定性和承压能力。
在过去的二十年里,各个国家的研究者们经过深入的探索,发现了多种超薄膜的制备方法。特别是在层层自组装这一领域,有着长足的进步,这是由于层层自组装这一方法在具有特殊功能性质的超薄膜的创新设计以及应用上具有非常好的效果。如中国专利申请号为200710042997.7提出了《一种纳米层状碳酸钙仿生复合材料料》,它是由低分子量有机物参与氯化钙和碳酸钠反应过程,导向方解石形成纳米薄层状结构,进而使层状结构定向组装纳米薄层的多层结构。这些研究对生物矿化材料的仿生合成起着重要的推动作用,但仍未能生长成具有天然碳酸钙结构(如软体动物中的高度规则的碳酸钙壳层、腕足动物的半珍珠层)的仿生材料,或者方法和材料性能还有待进一步提高。同时,利用自组装技术制备的薄膜还未应用到石油工程领域,在此方面还有非常大的拓展空间。
发明内容
本发明的目的是提供一种用于井壁加固的无机质、有机质杂化薄膜的实施工艺,利用自组装技术,在钻井井壁上形成致密、坚固的表面膜,用于对井壁进行加固,拓宽钻井液的安全密度窗口,保障钻井安全。
为了达到本发明的目的,本发明技术方案是这样实现的:
在三个储液罐中分别配制纳米颗粒悬浊液、阳离子聚合物溶液、阴离子聚合物溶液,质量百分比均为0.1%~0.2%wt。然后在三个储液罐中分别加入质量百分比为0.1~0.5%wt流体滞留剂,并搅拌均匀。然后按照阳离子聚合物溶液、阴离子聚合物溶液、阳离子聚合物溶液、纳米颗粒悬浊液的顺序把上述液体泵送入井眼内,每种液体的泵入体积为1~3m3,然后停顿5分钟,此为一个循环。经过8~15个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
上述方案中,纳米颗粒悬浊液的pH范围为8.0±0.5;阳离子聚合物溶液pH范围为4.0±0.5;阴离子聚合物溶液pH范围为8.0±0.5。
上述方案中,流体滞留剂为酚醛系超短碳纤维、聚丙烯超短纤维、涤纶超短纤维、玻璃超短纤维、聚酯超短纤维、纳米改性超短纤维中的一种或几种的组合。
上述方案中,配制阳离子聚合物溶液用的阳离子聚合物为邻苯二甲酸二乙二醇二丙烯酸酯(PDDA)、直链聚乙烯亚胺(LPEI)、支链聚乙烯亚胺(BPEI)、多环芳烃(PAH)、阳离子聚丙烯酰胺(CPAM)、聚氧乙烯氯化二甲亚铵(WSCP)、聚胺中的一种或几种的组合。
上述方案中,配制阴离子聚合物溶液用的阴离子聚合物为聚苯乙烯磺酸钠(PSS)、聚乙烯硫酸(PVS)、盐酸苯丙醇胺(PAA)、聚甲基丙烯酸(PMAA)、水解聚丙烯酰胺(APAM)中的一种或几种的组合。
上述方案中,配制纳米颗粒悬浊液用的纳米颗粒为纳米二氧化硅、纳米碳酸钙、纳米蒙脱土、纳米重晶石中的一种或几种的组合。
本发明具有以下优势:
(1)本发明中井壁加固的原理是利用自组装技术实现纳米颗粒的层层沉积,以此形成沉积层加固井壁。此方法生产的沉积层具有非常好的附着性能、致密性和韧性,在水和电解质溶液中存放30天以上不会从固体上发生脱落。
(2)本发明中加入纳米改性超短纤维,用于提高钻井液的结构力和悬浮能力,增加其流变滞留性,防止不同溶液之间的互串,影响加固效果。
(3)本发明利用纳米颗粒来加固井壁,所用材料具有较好的环境有效性,环保效果较好。
具体实施方式
实施例1:
在不同储液罐中分别配制质量百分比为0.1%wt的纳米二氧化硅悬浊液(pH=7.5)、质量百分比0.1%wt的PDDA溶液(pH=3.5)、质量百分比0.1%wt的PSS溶液(pH=7.5)阴离子聚合物溶液。然后分别加入质量百分比为0.1%wt酚醛系超短碳纤维,并搅拌均匀。先泵入1 m3的PDDA溶液,然后泵入1 m3 的PSS溶液,再泵入1 m3 的PDDA溶液,最后泵入1 m3的纳米二氧化硅悬浊液,泵入后停顿5分钟,此泵入过程做为一个循环。经过8个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
实施例2:
在不同储液罐中分别配制质量百分比为0.1%wt的纳米蒙脱土悬浊液(pH=8)、质量百分比0.1%wt的BPEI溶液(pH=4)、质量百分比0.1%wt的PAA溶液(pH=8)阴离子聚合物溶液。然后分别加入质量百分比为0.2%wt的聚丙烯超短纤维,并搅拌均匀。先泵入2 m3的BPEI溶液,然后泵入2 m3的PAA溶液,再泵入2 m3 的BPEI溶液,最后泵入2m3的纳米蒙脱土悬浊液,泵入后停顿5分钟,此泵入过程做为一个循环。经过10个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
实施例3:
在不同储液罐中分别配制质量百分比为0.2%wt的纳米碳酸钙悬浊液(pH=8.5)、质量百分比0.1%wt的PAH溶液(pH=4.5)、质量百分比0.1%wt的PVS溶液(pH=8.5)阴离子聚合物溶液。然后分别加入质量百分比为0.1%wt聚酯超短纤维,并搅拌均匀。先泵入3 m3 的PAH溶液,然后泵入3m3 的PVS溶液,再泵入3 m3 的PAH溶液,最后泵入3m3的纳米碳酸钙悬浊液,泵入后停顿5分钟,此泵入过程做为一个循环。经过8个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
实施例4:
在不同储液罐中分别配制质量百分比为0.15%wt的纳米碳酸钙和纳米蒙脱土的混合物(混合质量比为1:3)悬浊液(pH=8)、质量百分比0.15%wt的WSCP溶液(pH=4.5)、质量百分比0.15%wt的APAM溶液(pH=7.5)阴离子聚合物溶液。然后分别加入质量百分比为0.3%wt聚丙烯超短纤维和聚酯超短纤维的混合物(混合质量比为2::1),并搅拌均匀。先泵入2 m3 的WSCP溶液,然后泵入2m3 的APAM溶液,再泵入2 m3 的PAH溶液,最后泵入2m3的纳米碳酸钙悬浊液,泵入后停顿5分钟,此泵入过程做为一个循环。经过12个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
Claims (6)
1.一种用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于按下述步骤进行:
在三个储液罐中分别配制纳米颗粒悬浊液、阳离子聚合物溶液、阴离子聚合物溶液,质量百分比均为0.1%~0.2%wt;然后在三个储液罐中分别加入质量百分比为0.1~0.5%wt流体滞留剂,并搅拌均匀;再后按照阳离子聚合物溶液、阴离子聚合物溶液、阳离子聚合物溶液、纳米颗粒悬浊液的顺序把上述液体泵送入井眼内,每种液体的泵入体积为1~3m3,然后停顿5分钟,此为一个循环;经过8~15个循环后,利用钻井液将上述溶液顶替出井眼即完成井壁加固过程。
2.根据权利要求1所述的用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于:纳米颗粒悬浊液的pH范围为8.0±0.5;阳离子聚合物溶液pH范围为4.0±0.5;阴离子聚合物溶液pH范围为8.0±0.5。
3.根据权利要求1或2所述的用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于:所述流体滞留剂为酚醛系超短碳纤维、聚丙烯超短纤维、涤纶超短纤维、玻璃超短纤维、聚酯超短纤维、纳米改性超短纤维中的一种或几种的组合。
4.根据权利要求1或2所述的用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于:配制阳离子聚合物溶液用的阳离子聚合物为邻苯二甲酸二乙二醇二丙烯酸酯、直链聚乙烯亚胺、支链聚乙烯亚胺、多环芳烃、阳离子聚丙烯酰胺、聚氧乙烯氯化二甲亚铵、聚胺中的一种或几种的组合。
5.根据权利要求1或2所述的用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于:配制阴离子聚合物溶液用的阴离子聚合物为聚苯乙烯磺酸钠、聚乙烯硫酸、盐酸苯丙醇胺、聚甲基丙烯酸、水解聚丙烯酰胺中的一种或几种的组合。
6.根据权利要求1或2所述的一种用于井壁加固的无机质、有机质杂化薄膜的实施工艺,其特征在于:配制纳米颗粒悬浊液用的纳米颗粒为纳米二氧化硅、纳米碳酸钙、纳米蒙脱土、纳米重晶石中的一种或几种的组合。
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