CN113930231B - 一种水基完井液及其制备和应用 - Google Patents
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Abstract
本申请公开了一种水基完井液及其制备和应用。本申请的水基完井液,可用于稠油储层,将稠油降粘技术与完井液系统的结合起来,是一套强抑制、无固相、防止油水乳化增粘的水基完井液体系。其对稠油降粘率高,对粘土颗粒有强抑制性,对金属腐蚀速率低,与储层流体的配伍性好,对储层保护效果优异;另外,该完井液制备方法简单,完全满足现场现用现配。
Description
技术领域
本申请属于石油开发钻完井液技术领域,涉及但不限于一种强抑制、无固相、防止油水乳化增粘的水基完井液。
背景技术
据初步统计,90%以上疏松砂岩储层伴随着稠油储藏。疏松砂岩储层埋藏浅,成岩性差,胶结疏松,储层泥质质量分数普遍较高,属高孔、高渗型储层。由于储层具有高孔、高渗特性,完井液往往漏失严重,若完井液与储层流体特别是稠油不配伍会导致稠油流动性变差,影响稠油油藏的开发,抑制油藏产能的释放。针对疏松砂岩储层伴随着稠油储藏,完井液除了具备保护储层的必要功能外,一方面还要与储层流体特别是稠油之间具有良好的配伍性,另一方面又要具备强抑制性和降低稠油流动阻力的特性。因此需要开发一种与稠油配伍性好,抑制能力强,储层保护效果好的稠油储层水基完井液。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
首先,本申请提供了一种水基完井液,按质量份计包括0.1份至1份的防逆乳化剂、1份至10份的粘土抑制剂、0.1份至2份的缓蚀剂和16份至200份的水;
所述防逆乳化剂包括化合物(I),
(I)
式(I)中R1是选自如下取代基中的任意一种:氢,C1至C4烷基,芳基或杂环取代的C1至C4烷基,C3至C6环烷基,芳基,直链C1至C6烷基取代的芳基,支链C3至C6烷基取代的芳基,杂环,直链C1至C6烷基取代的杂环和支链C3至C6烷基取代的杂环;n的取值范围为1≤n≤100;
所述粘土抑制剂包括化合物(II),
(II)
式(II)中R2和R3各自独立地是选自如下取代基中的任意一种:氢,C1至C4烷基,芳基或杂环取代的C1至C4烷基,C3至C6环烷基,芳基,直链C1至C6烷基取代的芳基,支链C3至C6烷基取代的芳基,杂环,直链C1至C6烷基取代的杂环和支链C3至C6烷基取代的杂环;n的取值范围为1≤n≤100。
可选地,水的质量份还可以为16份至91份。
可选地,所述水基完井液由以上组分组成。
所述防逆乳化剂包括上述化合物(I);所述粘土抑制剂包括上述的化合物(II);所述防逆乳化剂为无色粘稠液体,易溶于水、稳定性好;所述粘土抑制剂为阳离子聚合物,安全、无毒、对pH值变化不敏感,对粘土的水化膨胀具有很强的抑制作用。
可选地,所述防逆乳化剂还包括硬脂酸盐阴离子表面活性剂、油酸盐阴离子表面活性剂、铵盐类阳离子表面活性剂、季铵盐类阳离子表面活性剂、单油酸酯非离子表面活性剂、三油酸脂非离子表面活性剂中和壬基酚聚氧乙烯醚类非离子表面活性剂的任意一种或更多种;
可选地,所述防逆乳化剂中,化合物(I)与表面活性剂的质量比为(1至99):(5至95)。
可选地,所述粘土抑制剂还包括阳离子聚丙烯酰胺、聚季铵盐类化合物、氯化胆碱类粘土抑制剂和小阳离子类粘土抑制剂中的任意一种或更多种;所述小阳离子类粘土抑制剂是一类合成后呈现流动状的液体聚合物。
可选地,所述粘土抑制剂中,阳离子聚丙烯酰胺或聚季铵盐类化合物与化合物(II)的质量比为(1至99):(5至99)。
可选地,所述缓蚀剂包括咪唑林类化合物、咪唑林季铵盐类化合物、膦酸盐类化合物、硫脲、硫代硫酸钠和抗坏血酸中的一种或多种。
可选地,所述水基完井液中还包括密度调节剂,所述密度调节剂中包括无机盐和有机盐,所述无机盐选自氯化钠、氯化钾、氯化钙和溴化钙中的任意一种或更多种;所述有机盐包括甲酸钠、甲酸铯和甲酸钾中的任一种或更多种;
可选地,所述水基完井液的密度范围为1.03至2.32g/ml。
可选地,水的矿化度为95g/L至5050g/L。
又一方面,本申请提供了上述的水基完井液的制备方法,包括步骤如下:将向水中加入防逆乳化剂,待所述防逆乳化剂完全溶解后加入所述粘土抑制剂,混合均匀后再加入缓蚀剂,溶液混合均匀即得所述完井液;
可选地,本申请提供的所述水基完井液由以上制备方法制得。
可选地,所述水基完井液还可以包括除垢剂,所述除垢剂的质量份为0.1至2份。可选地,所述水基完井液还包括除垢剂,所述除垢剂选自柠檬酸、草酸、盐酸、氢氧化钠和氢氧化钾中的任一种或更多种;
可选地,所述水基完井液还可以包括消泡剂,因为在水基完井液的在配制过程中,完井液可能会起泡,为了解决这一问题可根据实际情况向体系中加入适量的消泡剂;
所述消泡剂的质量份为0.1份至2份;所述消泡剂选自矿物油类消泡剂、醇类消泡剂、脂肪酸及脂肪酸酯类消泡剂、酰胺类消泡剂、磷酸酯类消泡剂、有机硅类消泡剂、聚醚类消泡剂和聚醚改性聚硅氧烷类消泡剂中的一种或多种;
可选地,当所述水基完井液中还包含密度调节剂时,先将密度调节剂与水混合均匀后形成基液,再将所述防逆乳化剂加入基液中;所述密度调节剂根据完井液的密度选择性的加入。
又一方面,本申请提供了上述的完井液在稠油储层中的应用;
可选地,所述稠油的粘度范围在100mPa·s至12000mPa·s(50℃)。
本申请的稠油储层水基完井液将稠油降粘技术与完井液的结合,是一套强抑制、无固相、防止油水乳化增粘的水基完井液体系,与稠油中的重质油、沥青质等组分接触后,油水界面张力自发降低,表面活性剂分子快速吸附于油珠周围,形成定向单分子保护膜,油相稳定分散形成O/W型乳状液,使得混相粘度大幅下降,体系中也可改变管壁的润湿性,达到提液降阻的目的。
本申请的稠油储层水基完井液体系适用于稠油储层、粘土含量较高的储层、使用温度可以为220℃的储层、完井液密度的密度可以达到2.32g/cm3。
本申请的稠油储层水基完井液体系的优点是:1、对稠油降粘率高;经过搅拌,油滴便呈球状均匀稳定的分散在防逆乳化剂水溶液中,形成O/W型乳状液。2、强抑制性;粘土矿物的膨胀和运移是损害储层渗透率的重要因素。稠油储层水基完井液体系与粘土颗粒之间既有物理吸附又有化学吸附,物理吸附表现为抑制剂有较高的正电密度,与表面带负电荷的粘土颗粒发生静电吸附。化学吸附表现在与粘土相互作用时,与粘土的硅氧基中的氧原子形成氢键,在粘土颗粒的表面上形成一层保护膜,物理吸附与化学吸附协同,使粘土颗粒的晶层间斥力减少,同时使粘土颗粒与水分子之间隔开,从而抑制了粘土颗粒的水化膨胀。3、腐蚀速率低;稠油储层水基完井液体系通过与钢材中的金属形成配位键,在钢材表面化学吸附成几个分子厚的不可见膜,同时阻滞阳极和阴极反应,改变金属表面的性质从而减少由于氧气、二氧化碳、硫化氢引起的腐蚀。除此之外,能够阻碍水分子和去极化剂达到金属表面,保护金属。4、与储层流体的配伍性好。
本申请的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本申请而了解。本申请的其他优点可通过在说明书中所描述的方案来发明实现和获得。
附图说明
附图用来提供对本申请技术方案的理解,并且构成说明书的一部分,与本申请的实施例一起用于解释本申请的技术方案,并不构成对本申请技术方案的限制。
图1为本申请实施例1降粘性能评价图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚明白,下文对本申请的实施例进行详细说明。需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互任意组合。
实施例1
将90质量份的无机盐和有机盐(氯化钠、氯化钾、氯化钙、溴化钙、甲酸钠、甲酸铯和甲酸钾,质量比为6:1:5:1:2:11:19)加入到55质量份的模拟海水(矿化度为34.61g/L)中,此时水的矿化度为3468g/L,搅拌至完全溶解,配制成盐水溶液基液,向基液中依次加入0.5质量份的化合物I(化合物I中的R1为苯基,n为50至70)、0.1质量份阳离子表面活性剂(即防逆乳化剂共0.6份);搅拌均匀后加入1.5质量份化合物II(化合物II中的R2和R3分别为正丁基,n为65至85)、0.5质量份的20至30离子度阳离子聚丙烯酰胺(即粘土抑制剂共2份),搅拌均匀后加入0.5质量份缓蚀剂,充分搅拌循环,搅拌时间≥50分钟,温度≥5℃,即得稠油储层水基完井液,所述完井液的密度为1.55g/mL。
所述缓蚀剂为咪唑林季铵盐类化合物,购自郑州德融科技有限公司,DRKJ-12;
所述20至30离子度的阳离子聚丙烯酰胺购自河南晨泉水处理材料有限公司,分子量为600万至800万;
所述阳离子表面活性剂是苯扎氯铵表面活性剂,购自济南蓝爵商贸有限公司,非氧化型;
实施例1的性能评价:
1.表界面张力
配制1份稠油储层完井液:将实施例1制得的完井液置于高搅杯中将高搅杯挂置于高速搅拌器上,在10000r/min的转速下高速搅拌20min,即得到未加重的完井液;室内实验在室温25℃的条件下进行,采用铂金环法测试稠油储层完井液的表面张力和界面张力,并且与蒸馏水、海水以及隐形酸完井液(隐形酸完井液购自天津中海油服化学有限公司,所述隐形酸完井液为刘雪婧, 王云庆. 隐形酸完井液的腐蚀与一种新型的缓蚀剂的研究[J].中海油田服务股份有限公司2011年科技论文报告会, 2011.文献中表2中的CA-102组)的表面张力和界面张力进行对比。通过对比发现,稠油储层完井液具有极低的表界面张力。测试结果如表1所示。
表1:
2.降粘性能评价
将SZ36-1油田的原油样(粘度范围在50℃下为7447mPa.s至9053mPa.s)与稠油储层完井液按照质量比10:0、9:1、8:2、7:3、6:4、5:5、4:6等比例混合后,在50℃的条件下利用,BROOKFIELD-DV-II+ Pro粘度计测量其粘度,并计算降粘率。测试结果如图1。
由图1可知,原油与实施例1提供的稠油储层完井液的比例在7:3以后,降粘率均达到了99%。
将SZ36-1油田的原油与实施例1提供的稠油储层完井液按照质量比为7:3的比例混合后,测量其在不同温度下的粘度并计算其降粘率。测试结果如表2。
表2:
由上表2可知,SZ36-1油田的原油样与实施例1提供的稠油储层完井液混合后,在不同的温度下,降粘率均达到90%以上。
3.防膨率性能评价
依据中国石油天然气行业标准SY/T 5971-1994规定的《注水用粘土稳定剂性能评价方法》中的防膨率的测定方法来评价稠油储层完井液的防膨能力。实验结果见表3。
防膨率的计算公式如下:
表3:
由表3可以看出,稠油储层完井液的防膨率达到了90%以上。
4.1.配伍性能评价
根据SZ36-1区块地层水资料,配制模拟地层水(NaCO3 0.339 g/L,NaHCO3 2.862g/L,NaSO4 0.182 g/L,NaCl 3.051 g/L,CaCl2 0.014 g/L,MgCl2 0.186 g/L,KCl 0.006g/L)再将模拟地层水与实施例1提供的完井液按不同比例混合,用浊度仪测量其混合后的浊度值,并观察是否出现沉淀。从最终得到的实验结果来看,模拟地层水与完井液按不同比例混合后未出现沉淀。浊度的测量结果见表4。
表4:
5. 腐蚀性能评价
修井过程中,井下工具的腐蚀会造成设备维修量大、维修费用高、停产、生产效率低、成本提高等情况发生。因此完修井液的腐蚀性能决定了后期的维护费用。根据中国石油行业标准SY/T 5273-2000《油田采出水用缓蚀剂性能评价方法》,采用挂片失重法对实施例1制得的完井液进行腐蚀实验。实验采用N80钢片,温度设置为80℃,采用静态腐蚀法进行试验72 h。根据如下公式计算腐蚀速率v a 。
根据实验数据计算出实施例1制得的完井液腐蚀速率为0.034mm/a,小于行业标准中规定的0.076mm/a,完全满足现场的作业需求。
实施例2至6
制备方法同实施例1,实施例2至6与实施例1的区别仅在于各物料用量不同,如下表5所示(质量份)。所述防逆乳化剂、粘土抑制剂中各组分的比例与实施例1的比例相同。
表5:
实施例2至6的性能评价同实施例1,各性能评价结果如表6所示。
表6:
所述降粘率的测试温度为220℃,当温度低于220℃时,实施例2至6提供的水基完井液的降粘率会更优。
对比例1
本对比例1与实施例1的区别仅在于,不涉及防逆乳化剂,其他条件相同。
对比例2
本对比例2与实施例1的区别仅在于,不涉及粘土抑制剂,其他条件相同。
对比例3
本对比例3与实施例1的区别仅在于,不涉及缓蚀剂,其他条件相同。
对比例1至3中所述防逆乳化剂、粘土抑制剂中各组分的比例与实施例1的比例相同,制备方法同实施例1,各物料量如下表7所示。
表7:
对比例1至3的性能评价同实施例1,各性能评价结果如表8所示。
表8:
虽然本申请所揭露的实施方式如上,但所述的内容仅为便于理解本申请而采用的实施方式,并非用以限定本申请。任何本申请所属领域内的技术人员,在不脱离本申请所揭露的精神和范围的前提下,可以在实施的形式及细节上进行任何的修改与变化,但本申请的保护范围,仍须以所附的书所界定的范围为准。
Claims (8)
2.根据权利要求1所述的水基完井液,其特征在于,所述水基完井液中还包括密度调节剂,所述密度调节剂中包括无机盐和有机盐,所述无机盐选自氯化钠、氯化钾、氯化钙和溴化钙中的任意一种或更多种;所述有机盐包括甲酸钠、甲酸铯和甲酸钾中的任一种或更多种。
3.根据权利要求1所述的水基完井液,其特征在于,所述水基完井液的密度范围为1.03至2.32g/ml。
4.根据权利要求1所述的水基完井液,其特征在于,所述水的矿化度为95g/L至5050g/L。
5.一种权利要求1至4中任一项所述的水基完井液的制备方法,其特征在于,包括步骤如下:将向水中加入防逆乳化剂,待所述防逆乳化剂完全溶解后加入所述粘土抑制剂,混合均匀后再加入缓蚀剂,溶液混合均匀即得所述完井液。
6.根据权利要求5所述的水基完井液的制备方法,其特征在于,当所述水基完井液中还包含密度调节剂时,先将密度调节剂与水混合均匀后形成基液,再将所述防逆乳化剂加入基液中。
7.一种权利要求1至4中任一项所述的完井液在稠油储层中的应用。
8.根据权利要求7所述的完井液在稠油储层中的应用,其特征在于,所述稠油的粘度范围在100mPa·s至12000mPa·s。
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