CN114015429A - 一种利用水基压裂返排液制备水基压裂液的方法 - Google Patents
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Abstract
本发明属于油气井压裂增产技术领域,公开了一种利用水基压裂返排液制备水基压裂液的方法,包括S1:向压裂返排液中加入水质调节剂并搅拌5~10min,溶液产生乳白色沉淀,调节其上清液的PH值为8~9;S2:向S1中的液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,继续搅拌1~5min得到压裂液;S3:在压裂施工时,向S2中的压裂液加入破胶剂、螯合剂和支撑剂后一起注入油气井中;本发明解决了现有技术压裂施工后的返排液难以处理和无法进行回收再利用的问题,适用于压裂施工制备压裂液。
Description
技术领域
本发明涉及油气井压裂增产技术领域,具体为一种利用水基压裂返排液制备压裂液的方法。
背景技术
压裂是指采油或采气过程中,利用一定的作用力使油气层形成裂缝的一种方法,又称水力压裂。油层压裂工艺过程是用压裂车把高压、大排量具有一定粘度的液体挤入油层,把油层压出裂缝后,利用支撑剂充填裂缝以提高油气层的渗透能力,达到增加产油量的目的。压裂操作中使用的高压、大排量具有一定粘度的液体称为压裂液。随着压裂技术的不断进步,压裂施工的规模也越来越大,压裂液的用水量从每井次100m3提高到10000m3以上,而且压裂施工完成后含压裂液、泥砂、油气和地层水等混合溶液随破胶液一起返排到地面,如果这些废液处理不当,会对井场周围土壤、植被和地表水造成一定程度的影响。
聚合物乳液型水基压裂液是近几年兴起的一种新型、高效、多用途水基压裂液体系,与常规瓜胶压裂液性能比较,它具有压裂液组成简单、现场随配随压,不需提前配制原胶液等特点,极大简化了大型水力压裂施工,满足“滑溜水、线性胶和携砂液”一体化压裂液技术需求,倍受现场重视和欢迎。但是这种聚合物乳液型增稠剂的增稠剂抗盐性差,对配液水质要求高,很难满足利用返排液再配制压裂液水质要求;同时其破胶还不彻底,影响返排等,这些问题使得聚合物乳液型水基压裂液无法大规模化推广应用。随着国家和企业对“安全环保”和“提速降本”的要求提高,对西部和海上油气田的压裂施工迫切需要一种高抗盐且适应性广的压裂液体系,以实现对压裂返排的废液进行回收和再利用这一目的。
发明内容
本发明意在提供一种利用水基压裂返排液制备水基压裂液的方法,以解决现有技术压裂施工后的返排液难以处理和无法进行回收再利用的问题。
为了实现上述目的,本发明提供如下技术方案:
一种利用水基压裂返排液制备水基压裂液的方法,包括以下步骤:
S1:向压裂返排液中加入水质调节剂并搅拌5~10min,溶液产生乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中的液体增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,继续搅拌1~5min得到压裂液;
S3:在压裂施工时,向S2中的压裂液中加入破胶剂、螯合剂和支撑剂后一起注入油气井中。
进一步地,S1中的压裂返排液为压裂施工完成后返排液与地表水的复配溶液。
进一步地,S1中水质调节剂为碳酸氢钠,压裂返排液和碳酸氢钠的质量分数比为100:2~100:4。
进一步地,S2中的增稠剂为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,阻垢剂为聚天冬氨酸,粘度加强剂为质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺混合液,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5。
进一步地,S3中的破胶剂为过硫酸铵,螯合剂为乙二胺四乙酸,支撑剂为陶粒,压裂返排液、破胶剂和螯合剂的质量分数比为100:0.01:0.5。
本技术方案的原理及有益效果是:
1.变废为宝,水质调节剂碳酸氢钠使得返排液中的金属离子,尤其是二价金属离子如钙、镁、锶和钡等由可溶性盐转化为不溶性碳酸盐和硫酸盐,不但降低了返排液中的金属离子含量,而且生成的碳酸盐水不溶物起到降滤失剂的作用,使压裂液整体性得以显著提升;
2.提高了压裂液的粘度,粘度加强剂延迟增稠,使压裂液粘度在5~10min后显著提升,一是弥补了高矿化度的返排液对增稠剂增粘特性的影响,保证进入地层后的压裂液携砂所需的粘度;二是延迟增稠,保证压裂液在混砂车至井底炮眼之间这一段维持低粘度,减轻高粘度的压裂液因摩阻大造成地面泵组注入压力大,引起压裂液泵注困难的问题;
3.提高破胶效率,减少伤害,螯合剂将处理后的返排液中水不溶物重新转化为可溶性金属盐,既减少压裂液在地层形成的滤饼伤害;又使压裂液中的二价金属离子浓度重新增大,有利于加速压裂液的破胶和返排,同时,多余的螯合剂随着压裂液波及到碳酸盐地层的微裂缝中与其反应,可以拓展地层微裂缝尺寸,提高压裂整体效果;螯合剂清除地层钙、镁、钡、锶垢的堵塞,同时与碳酸盐地层岩心反应,扩大岩心渗透率,提高储层油气流通速率;
4.利用压裂施工完成后返排液与地表水复配,既补充了压裂施工完成后返排液用水量的不足,又降低了压裂施工完成后返排液的矿化度,便于后期的再利用。
附图说明
图1为本发明一种利用水基压裂返排液制备水基压裂液的方法的流程图;
图2为实施例一压裂液的粘温曲线图;
图3为实施例二压裂液的粘温曲线图;
图4为实施例三压裂液的剪切曲线图;
图5为实施例四压裂液的剪切曲线图;
具体实施方式
下面结合附图和实施方式对本发明作进一步的详细说明:
如图1所示,一种利用水基压裂返排液制备水基压裂液的方法,包括以下步骤:
S1:利用压裂施工完成后返排液与地表水的复配得到压裂返排液,分析溶液的水质结果如表1所示,然后向压裂返排液中加入水质调节剂并搅拌5~10min,溶液产生乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中的液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,继续搅拌1~5min得到压裂液;
S3:在压裂施工时,向S2中的压裂液中加入破胶剂、螯合剂和支撑剂后一起注入油气井中。
表1返排液水质分析结果
具体实施例如下:
实施例一:
S1:利用压裂施工完成后返排液与地表水按照1:1体积比复配得到一定量的压裂返排液,向压裂返排液中加入与压裂返排液的质量分数比为3%碳酸氢钠作为水质调节剂,然后搅拌5~10min,产生大量的乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,再搅拌搅拌1~5min得到压裂液;其中,增稠剂采用“一种多功能滑溜水压裂液减阻剂的制备方法”(专利号为CN201710034500.0)中的减阻剂,其为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,阻垢剂为聚天冬氨酸,粘度加强剂为质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺的混合液,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5。
如图2所示,加入3%水质调节剂+1%增稠剂+0.5%粘度加强剂,在170s-1,90℃下,压裂液连续剪切65min下的粘度为120mPa.s,压裂液的滤失量为:6mL,滤失系数为:5.21x10-4(m/min1/2)。
实施例2:
S1:利用压裂施工完成后返排液与地表水按照1:1体积比复配得到一定量的压裂返排液,向压裂返排液中加入与压裂返排液的质量分数比为4%碳酸氢钠作为水质调节剂,然后搅拌5~10min,产生大量的乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,再搅拌搅拌1~5min得到压裂液;其中,增稠剂采用“一种多功能滑溜水压裂液减阻剂的制备方法”(专利号为CN201710034500.0)中的减阻剂,其为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,阻垢剂为聚天冬氨酸,粘度加强剂为质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺的混合液,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5。
如图3所示,加入4%水质调节剂+1%增稠剂+0.5%粘度加强剂,在170s-1,压裂液连续剪切40min,温度由25升至90℃时,压裂液粘度为90mPa.s,当在剪切时间为17.5min,温度为65℃,压裂液粘度最大为170mPa.s,压裂液的滤失量为:5mL,滤失系数为:4.61x10-4(m/min1/2)。
实施例三:
S1:利用压裂施工完成后返排液与地表水按照1:1体积比复配得到一定量的压裂返排液,向压裂返排液中加入与压裂返排液的质量分数比为2%碳酸氢钠作为水质调节剂,然后搅拌5~10min,产生大量的乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,再搅拌搅拌1~5min得到压裂液;其中,增稠剂采用“一种多功能滑溜水压裂液减阻剂的制备方法”(专利号为CN201710034500.0)中的减阻剂,其为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,阻垢剂为聚天冬氨酸,粘度加强剂为质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺的混合液,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5。
S3:在压裂施工时,向S2中的压裂液中加入螯合剂和支撑剂后一起注入油气井中,其中,螯合剂为乙二胺四乙酸,支撑剂为陶粒,压裂返排液与螯合剂的质量分数比为100:0.5。
如图4所示,加入2%水质调节剂+1%增稠剂+0.5%粘度加强剂+0.5%螯合剂,压裂液在170s-1 ,90℃连续剪切90min下,压裂液粘度由100mPa.s降至为65mPa.s,滤失系数为:6.82x10-4(m/min1/2)。
实施例四:
S1:利用压裂施工完成后返排液与地表水按照1:1体积比复配得到一定量的压裂返排液,向压裂返排液中加入与压裂返排液的质量分数比为4%碳酸氢钠作为水质调节剂,然后搅拌5~10min,产生大量的乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中液体加入增稠剂,增稠剂采用“一种多功能滑溜水压裂液减阻剂的制备方法”(专利号为CN201710034500.0)中的减阻剂,其为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,搅拌1~5min后加入质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺的混合液作为粘度加强剂,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5;
S3:在压裂施工时,向S2中的压裂液中加入破胶剂、螯合剂和支撑剂后一起注入油气井中,其中,螯合剂为乙二胺四乙酸,破胶剂为过硫酸铵,支撑剂为陶粒,压裂返排液、螯合剂和破胶剂的质量分数比为100:0.5:0.01。
如图5所示,加入4%水质调节剂+1%增稠剂+0.5%粘度加强剂+0.5%螯合剂+0.01%破胶剂,压裂液在170s-1,90℃连续剪切80min下,压裂液粘度由70mPa.s降至为40mPa.s,压后压裂液在2~4h内破胶,破胶液粘度小于5mPa·s,破胶液表面张力≤28.0mN/m,界面张力≤2.0mN/m;粘土防膨率≥80%;滤失系数为:6.98x10-4(m/min1/2)。
以上所述的仅是本发明的实施例,方案中公知的具体技术方案或特性等常识在此未作过多描述。应当指出,对于本领域的技术人员来说,在不脱离本发明技术方案的前提下,还可以作出若干变形和改进,这些也应该视为本发明的保护范围,这些都不会影响本发明实施的效果和专利的实用性。本申请要求的保护范围应当以其权利要求的内容为准,说明书中的具体实施方式等记载可以用于解释权利要求的内容。
Claims (5)
1.一种利用水基压裂返排液制备水基压裂液的方法,其特征在于,包括以下步骤:
S1:向压裂返排液中加入水质调节剂并搅拌5~10min,溶液产生乳白色沉淀,调节其上清液的PH值为8~9;
S2:向S1中的液体加入增稠剂和阻垢剂,搅拌1~5min后加入粘度加强剂,继续搅拌1~5min得到压裂液;
S3:在压裂施工时,向S2中的压裂液中加入破胶剂、螯合剂和支撑剂后一起注入油气井中。
2.根据权利要求1所述的一种利用水基压裂返排液制备水基压裂液的方法,其特征在于:S1中的压裂返排液为压裂施工完成后返排液与地表水的复配溶液。
3.根据权利要求2所述的一种利用水基压裂返排液制备水基压裂液的方法,其特征在于:S1中水质调节剂为碳酸氢钠,压裂返排液和碳酸氢钠的质量分数比为100:2~100:4。
4.根据权利要求3所述的一种利用水基压裂返排液制备水基压裂液的方法,其特征在于:S2中的增稠剂为丙烯酰胺AM与2-丙烯酰胺-2-甲基丙磺酸单体形成的乳液聚合物,阻垢剂为聚天冬氨酸,粘度加强剂为质量比为1:1的椰油基丙基甜菜碱CAB与椰子油脂肪酸二乙醇酰胺混合液,压裂返排液、增稠剂和粘度加强剂的质量分数比为100:1:0.5。
5.根据权利要求4所述的一种利用水基压裂返排液制备水基压裂液的方法,其特征在于:S3中的破胶剂为过硫酸铵,螯合剂为乙二胺四乙酸,支撑剂为陶粒,压裂返排液、破胶剂和螯合剂的质量分数比为100:0.01:0.5。
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