CN110510771A - 一种胍胶体系压裂返排液处理方法及装置 - Google Patents
一种胍胶体系压裂返排液处理方法及装置 Download PDFInfo
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Abstract
本发明公开了一种胍胶体系压裂返排液处理方法及装置，包括如下步骤：(1)将压裂返排液进行协同高级氧化处理；(2)将经过协同高级氧化处理的废液进行超纳米气溶处理；(3)将经过超纳米气溶处理后的上清液进行耐油组合过滤处理；(4)将经过耐油组合过滤处理后的浓水返回返排液储池，排水进行回注或深度处理。有益效果：能减少化学药剂的引入和用量，降低成本，避免二次污染；提高反应效率，精简工艺流程，集成功能，减少设备投资和设备占地面积；提高现有压裂返排液处理技术的实用性和工艺运行的长期稳定性，减少反应条件的影响。
Description
技术领域
本发明涉及废水处理技术领域，具体涉及一种胍胶体系压裂返排液处理方法及装置。
背景技术
压裂作业是油气田开采过程中的一个重要环节，通过压裂可以改善油气井产能等问题，对于油田老区油井挖潜增效、新井试油和单井增产发挥着十分重要的作用。然而，压裂技术的应用使得油气井在压裂过程中不可避免的产生废液，主要有压裂返排水和施工剩余的压裂液，成了油田开采过程中不容忽视的污染源。
胍胶体系在常规油藏和高温环境中的应用效果较好，应用最为广泛。相对于滑溜水压裂体系，胍胶体系的压裂返排水具有粘度大、污染物种类多、石油和悬浮物含量高、COD含量高、矿化度高、稳定性高、处理难度较大等特点。
尽管目前国内的胍胶体系压裂返排液处理技术达到了一定水平，但都或多或少存在一些缺陷，如为脱稳破胶和絮凝，除去返排液中的胶质悬浮物，需使用大量的化学药剂，处理成本高，一些化学试剂化学性质不稳定，易受到反应条件的影响，且易造成二次污染；生化技术能耗小，处理成本低，且能起到杀菌作用，但处理周期长、占地大，受各油田气候环境、盐含量等影响较大，应用受到局限；现有的处理方法和工艺流程相对固定，但压裂返排液成分复杂，难以确保处理后的返排液有效的达到国家相关排放和回用标准。
发明内容
为了解决上述技术问题，本发明提出了一种胍胶体系压裂返排液处理方法及装置，该处理方法及装置能减少化学药剂的引入和用量，降低成本；提高反应效率，精简工艺流程，集成功能，减少设备投资和设备占地面积；提高现有压裂返排液处理技术的实用性和工艺运行的长期稳定性，减少反应条件的影响。
本发明所采用的技术方案是：
一种胍胶体系压裂返排液处理方法，该方法包括如下步骤：
(1)将压裂返排液进行协同高级氧化处理；
(2)将经过协同高级氧化处理的废液进行超纳米气溶处理；
(3)将经过超纳米气溶处理后的上清液进行耐油组合过滤处理；
(4)将经过耐油组合过滤处理后的浓水返回返排液储池，排水进行回注或深度处理。
进一步地，所述协同高级氧化处理以臭氧为氧化剂，双氧水为协同剂，双氧水和臭氧的投加质量比为1-10:1，臭氧投加量为5-100mg/L。
进一步地，所述双氧水和臭氧的投加质量比为1-5:1，臭氧投加量为5-50mg/L。
进一步地，所述协同高级氧化反应时间为5-15min。
进一步地，所述协同高级氧化反应时间为5-10min。
进一步地，所述超纳米气溶处理，采用多相流溶气泵，产生超纳米气泡。
进一步地，所述多相流溶气泵运行压力为4.5-6Bar，所述超纳米气泡粒径为100-500nm。
进一步地，所述耐油组合过滤处理包括袋式过滤处理和疏油管式微滤膜过滤处理。
一种胍胶体系压裂返排液处理装置，包括双氧水加药装置，臭氧发生装置，协同高级氧化反应器，超纳米气溶器，袋式过滤器，疏油管式微滤膜过滤器，所述双氧水加药装置连接在协同高级氧化反应器进液管上，所述臭氧发生装置连接在协同高级氧化反应器底部，所述协同高级氧化反应器，超纳米气溶器，袋式过滤器，疏油管式微滤膜过滤器顺序连接。
进一步地，所述协同高级氧化反应器内部有散堆拉西环填料，填充体积为70％～100％。
进一步地，协同高级氧化反应器内散堆拉西环的填充体积为填充体积80％。
进一步地，所述臭氧发生装置为富氧源臭氧制取器。
进一步地，所述袋式过滤器滤袋材质为加厚聚丙烯双层吸油棉，滤袋精度为3-5μm，最大操作压力为1.0Mpa，单个袋式过滤器中滤袋数量≥2个。
进一步地，所述管式微滤膜过滤器膜管直径为8-12mm，过滤形式为错流式过滤。
进一步地，所述管式微滤膜过滤器内壁为PES材质，成膜接触角75-85°，膜通量100～200L/(m2·h)，操作压力0.05-0.06Mpa。
与现有技术相比，本发明的有益效果是：
本发明采用臭氧为氧化剂，双氧水为协同剂，在臭氧和双氧水的协同作用下产生大量的羟基自由基，氧化还原电位可达2.70V，能显著提高胍胶的氧化效果和反应速率，反应过程中加药量少，不产生污泥，无外加药剂的副作用，反应时间缩短1/3，对井口刚返排出的粘度较大的压裂返排液降粘作用明显，一步氧化到位，适用范围广。
本发明协同高级氧化反应器内部装填散堆拉西环填料，加快氧化反应速率，提高反应效果，节省了反应时间。
本发明采用的超纳米气溶装置，在不加药的情况下同时去除压裂返排液的中的石油类和悬浮物。超纳米气泡的比表面积是普通溶气气浮的1000倍以上，汽水接触表面积大，传质效率高；气液界面的表面张力可以承受气泡内气体的压力，高压气泡可以增加气体溶解速率。在运行过程，纳米气泡粘附石油类污染物、中小粒径的悬浮物上浮到液面以上，通过刮渣机刮走。机械杂质、大粒径的悬浮物则沉降在气浮池的污泥斗中，达到在不加药的情况下同时去除石油和悬浮物的目的。因为气泡产机制不同，超纳米气溶器不含空压机、溶气罐、配套溶气释放区等装置，同样处理量下得以减小设备占地面积。
本发明采用的耐油组合过滤器，从材质选用和运行模式上避免石油类预处理不彻底对胍胶体系压裂返排液的精滤设备及其它以回用、排放为目的深层处理设备造成不可逆的影响。同时，本发明可有效解决对胍胶体系压裂返排液回注的粒径中值问题。相对于陶瓷板膜过滤、多介质和砂滤等，本发明占地面积小，过滤效果好、操作更简便。
下面结合附图和具体实施方式对本发明作详细说明。
附图说明
图1为该胍胶体系压裂返排液处理方法的结构示意图。
图2为该胍胶体系压裂返排液处理装置的工艺流程图。
其中，1.双氧水加药装置，2.协同高级氧化反应器，3.超纳米气溶器，4.袋式过滤器，5.疏油管式微滤膜过滤器，6.臭氧发生装置，7.拉西环填料，8.多相流溶气泵，9.沉泥斗，10.潜水泵。
具体实施方式
实施例，如图1和2所示，在返排液进液管道上用双氧水加药装置1投加双氧水，返排液随后进入协同高级氧化反应器2，协同高级氧化反应器2内散堆拉西环填料7，填充体积为70％～100％，进一步优选为80％，通过臭氧发生装置6向协同高级氧化反应器2通入臭氧，所述臭氧发生装置为富氧源臭氧制取器，臭氧投加量为5-100mg/L，进一步优选为5-50mg/L，双氧水和臭氧的投加质量比为1-10:1，进一步优选为1-5:1，在协同高级氧化反应器2内，氧化反应时间为5-15min，进一步优选为5-10min，协同高级氧化反应器2内，产生大量强氧化的羟基自由基，显著提高胍胶的氧化效果和反应速率，反应过程中加药量少，不产生污染，无外加药剂的副作用。
经过协同高级氧化后的返排液从协同高级氧化反应器2通过管道溢流进入超纳米气溶器3。超纳米气溶器在多相流溶气泵8的减压释放下产生的超纳米气泡，多相流溶气泵运行压力为4.5-6Bar，超纳米气泡粒径为100-500nm，超纳米气泡粘附石油类、小粒径颗粒的悬浮物浮出水面，被刮渣机从污水中分离；粒度较大的机械杂质、悬浮物、泥沙等在沉泥斗9中沉降，达到在不加药的情况下同时去除石油和悬浮物的目的，同时，超纳米气溶器不含空压机、溶气罐、配套溶气释放区等装置，同样处理量下得以减小设备占地面积。
污水继续进入超纳米气溶器的清水缓存区，经潜水泵10依次泵入袋式过滤器4、疏油管式微滤膜过滤器5进行深度处理，袋式过滤器滤袋材质为加厚聚丙烯双层吸油棉，滤袋精度为3-5μm，最大操作压力为1.0Mpa，单个袋式过滤器中滤袋数量≥2个，管式微滤膜过滤器膜管直径为8-12mm，过滤形式为错流式过滤，内壁为PES材质，成膜接触角75-85°，膜通量100-200L/(m2·h)，操作压力0.05-0.06Mpa。深层去除残余的石油类、悬浮物等，有效解决对胍胶体系压裂返排液回注的粒径中值问题，相对于陶瓷板膜过滤、多介质和砂滤等，本发明占地面积小，过滤效果好、操作更简便。
将经过耐油组合过滤处理后的浓水返回返排液储池，排水进行回注或深度处理。
实施例1，结合图1和图2，待处理的压裂返排液为新疆克拉玛依地区产生的胍胶体系压裂返排液，压裂返排液中原水含油350mg/L，悬浮含量325mg/L，粘度35mPa·s，SRB 50个/mL，其处理方法为：
(1)在返排液进液管道上用双氧水加药装置1投加双氧水，返排液随后进入协同高级氧化反应器2，协同高级氧化反应器2内散堆拉西环填料7填充体积为100％，拉西环尺寸为Φ50mm，通过臭氧发生装置6向协同高级氧化反应器2通入臭氧，所述臭氧发生装置为富氧源臭氧制取器，每升压裂返排液加入臭氧100mg/L，双氧水和臭氧的投加质量比为10:1，在协同高级氧化反应器2内停留时间15min。
(2)经过协同高级氧化后的返排液从协同高级氧化反应器2通过管道溢流进入超纳米气溶器3。超纳米气溶器在多相流溶气泵8的减压释放下产生的超纳米气泡，多相流溶气泵运行压力为6Bar，超纳米气泡粒径为150nm，污水停留时间为20min。
(3)污水继续进入超纳米气溶器的清水缓存区，经潜水泵10依次泵入袋式过滤器4、疏油管式微滤膜过滤器5进行过滤处理，袋式过滤器滤袋材质为加厚聚丙烯双层吸油棉，滤袋精度为5μm，操作压力为1.0Mpa，单个袋式过滤器中滤袋数量4个，管式微滤膜过滤器膜管直径为12mm，过滤形式为错流式过滤，内壁为PES材质，成膜接触角85°，膜通量200L/(m2·h)，操作压力0.06Mpa。出水悬浮物1.5mg/L，含油2.5mg/L，粘度1.2mPa·s，SRB 0个/mL，粒径中值≤1.0μm，达到《SY/T 5239碎屑岩油藏注水水质推荐指标》中A2标准要求。
实施例2，结合图1和图2，待处理的压裂返排液为长庆地区产生的胍胶体系压裂返排液，压裂返排液中原水含油120mg/L，悬浮含量755mg/L，粘度15mPa·s，SRB15个/mL，其处理方法为：
(1)在返排液进液管道上用双氧水加药装置1投加双氧水，返排液随后进入协同高级氧化反应器2，协同高级氧化反应器2内散堆拉西环填料7填充体积为70％，拉西环尺寸为Φ25mm，通过臭氧发生装置6向协同高级氧化反应器2通入臭氧，所述臭氧发生装置为富氧源臭氧制取器，每升压裂返排液加入臭氧5mg/L，双氧水和臭氧的投加质量比为1:1，在协同高级氧化反应器2内停留时间5min，产生大量强氧化的羟基自由基、并发生氧化、矿化、破乳、杀菌、提高絮凝效果等反应。
(2)经过协同高级氧化后的返排液从协同高级氧化反应器2通过管道溢流进入超纳米气溶器3。超纳米气溶器在多相流溶气泵8的减压释放下产生的超纳米气泡，多相流溶气泵运行压力为4.5Bar，超纳米气泡粒径为450nm，污水停留时间为30min。
(3)污水继续进入超纳米气溶器的清水缓存区，经潜水泵10依次泵入袋式过滤器4、疏油管式微滤膜过滤器5进行过滤处理，袋式过滤器滤袋材质为加厚聚丙烯双层吸油棉，滤袋精度为3μm，操作压力为0.5Mpa，单个袋式过滤器中滤袋数量2个，管式微滤膜过滤器膜管直径为8mm，过滤形式为错流式过滤，内壁为PES材质，成膜接触角75°，膜通量100L/(m2·h)，操作压力0.05Mpa。出水悬浮物1.0mg/L，含油1.2mg/L，粘度1mPa·s，SRB0个/mL，粒径中值＜1.0μm，达到《SY/T 5239碎屑岩油藏注水水质推荐指标》中A2标准要求。
本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (15)
1.一种胍胶体系压裂返排液处理方法，其特征在于，该方法包括如下步骤：
(1)将压裂返排液进行协同高级氧化处理；
(2)将经过协同高级氧化处理的废液进行超纳米气溶处理；
(3)将经过超纳米气溶处理后的上清液进行耐油组合过滤处理；
(4)将经过耐油组合过滤处理后的浓水返回返排液储池，排水进行回注或深度处理。
2.根据权利要求1所述的胍胶体系压裂返排液处理方法，其特征在于，所述协同高级氧化处理以臭氧为氧化剂，双氧水为协同剂，双氧水和臭氧的投加质量比为1-10:1，臭氧投加量为5-100mg/L。
3.根据权利要求2所述的胍胶体系压裂返排液处理方法，其特征在于，所述双氧水和臭氧的投加质量比为1-5:1，臭氧投加量为5-50mg/L。
4.根据权利要求2所述的胍胶体系压裂返排液处理方法，其特征在于，所述协同高级氧化反应时间为5-15min。
5.根据权利要求4所述的胍胶体系压裂返排液处理方法，其特征在于，所述协同高级氧化反应时间为5-10min。
6.根据权利要求1所述的胍胶体系压裂返排液处理方法，其特征在于，所述超纳米气溶处理，采用多相流溶气泵，产生超纳米气泡。
7.根据权利要求6所述的胍胶体系压裂返排液处理方法，其特征在于，所述多相流溶气泵运行压力为4.5-6Bar，所述超纳米气泡粒径为100-500nm。
8.根据权利要求7所述的胍胶体系压裂返排液处理方法，其特征在于，所述耐油组合过滤处理包括袋式过滤处理和疏油管式微滤膜过滤处理。
9.一种胍胶体系压裂返排液处理装置，其特征在于，包括双氧水加药装置，臭氧发生装置，协同高级氧化反应器，超纳米气溶器，袋式过滤器，疏油管式微滤膜过滤器，所述双氧水加药装置连接在协同高级氧化反应器进液管上，所述臭氧发生装置连接在协同高级氧化反应器底部，所述协同高级氧化反应器，超纳米气溶器，袋式过滤器，疏油管式微滤膜过滤器顺序连接。
10.根据权利要求9所述的胍胶体系压裂返排液处理装置，其特征在于，所述协同高级氧化反应器内部有散堆拉西环填料，填充体积为70％～100％。
11.根据权利要求10所述的胍胶体系压裂返排液处理装置，其特征在于，所述协同高级氧化反应器内散堆拉西环的填充体积为80％。
12.根据权利要求9所述的胍胶体系压裂返排液处理装置，其特征在于，所述臭氧发生装置为富氧源臭氧制取器。
13.根据权利要求9所述的胍胶体系压裂返排液处理装置，其特征在于，所述袋式过滤器滤袋材质为加厚聚丙烯双层吸油棉，滤袋精度为3-5μm，最大操作压力为1.0Mpa，单个袋式过滤器中滤袋数量≥2个。
14.根据权利要求9所述的胍胶体系压裂返排液处理装置，其特征在于，所述管式微滤膜过滤器膜管直径为8-12mm，过滤形式为错流式过滤。
15.根据权利要求9所述的胍胶体系压裂返排液处理装置，其特征在于，所述管式微滤膜过滤器内壁为PES材质，成膜接触角75-85°，膜通量100～200L/(m2·h)，操作压力0.05-0.06Mpa。
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