CN111517730A - 自生导热渗透石的压裂水泥浆及应用 - Google Patents
自生导热渗透石的压裂水泥浆及应用 Download PDFInfo
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Abstract
本发明公开了一种自生导热渗透石的压裂水泥浆及应用,该自生导热渗透石的压裂水泥浆由导热剂5‑30wt%,渗透剂10‑40wt%,水泥20‑50wt%,水20‑60wt%配制而成。该压裂水泥浆被压入地层天然孔隙裂缝和压开人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;压裂水泥浆凝固后,成为具有高导热、高渗透、高强度、大缝面和微纳米级连通孔缝的自生导热渗透石,支撑和连通立体裂缝网。本发明可广泛应用于煤层气、页岩气、页岩油、可燃冰、地热、稠油等非常规能源开采的压裂增产、热采、导热、换热、控水、防砂、防塌、防漏、防腐等领域。
Description
技术领域
本发明涉及一种自生导热渗透石的压裂水泥浆制备方法及应用。
背景技术
常规的水力加砂压裂技术是利用地面高压泵,通过井筒向油气层注人清水、水基、油基、泡沫等压裂液和石英砂、陶粒等支撑剂,在油气层中形成一条或多条长、宽、高不等的支撑裂缝,使油气层与井筒之间建立起新的高渗透裂缝通道,提高油气井的产量。
但是,常规水力加砂压裂技术用于煤层气、页岩气、页岩油、可燃冰、稠油、地热等非常规能源增产开采,存在用水多、出水多、出砂多、裂缝面积小、导热性差、增产低、成本高、污染大等问题,严重制约非常规能源的高效开发利用。
上述背景技术是为了便于理解本发明,并非是申请本发明之前已向普通公众公开的公知技术。
发明内容
基于上述问题,一方面,本发明提供一种自生导热渗透石的压裂水泥浆,用该压裂水泥浆进行压裂,自生导热渗透水泥石具有高导热、高渗透、高强度、大缝面、用水少、环保好、成本低等独特优势,可广泛应用于煤层气、页岩气、页岩油、可燃冰、稠油、地热等非常规能源开采,有效解决常规水力加砂压裂开采的压裂用水多、出水多、出砂多、裂缝面积小、导热性差、产量低、成本高、污染大等问题。
技术方案是:一种自生导热渗透石的压裂水泥浆,该自生导热渗透石的压裂水泥浆由以下成分的物质制成:
导热剂 5-30wt%;
渗透剂 10-40wt%;
水泥 20-50wt%;
水 20-60wt%。
本发明中,压裂水泥浆被高压注入地层天然孔隙裂缝和压开人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;压裂水泥浆凝固后,自生具有高导热、高渗透、高强度、大缝面和微纳米孔的导热渗透水泥石,支撑和连通立体裂缝网。
作为优选,所述导热剂为石墨烯、石墨、活性炭、炭黑、木炭、竹炭、稻壳炭或其混合物。
作为优选,所述渗透剂为液态水溶性的甲醇、乙醇、丙醇、丁醇、乙醚、聚乙二醇、聚乙二醇单甲醚、聚乙二醇双甲醚、聚乙烯亚胺、聚苯乙烯磺酸钠等有机物或其混合物。
作为优选,所述水泥为油井水泥、硅酸盐水泥、铝酸盐水泥、硫铝酸盐水泥、铁铝酸盐水泥、氟铝酸盐水泥、磷酸盐水泥、火山灰水泥、矿渣水泥、粉煤灰水泥、树脂水泥或其混合物。
一方面,本发明还提供一种上述自生导热渗透石的压裂水泥浆制备方法。
该方法包括以下步骤:
①取导热剂和渗透剂,搅拌混合,分散均匀成混合剂;
②将①的混合剂、水及水泥搅拌、混合形成压裂水泥浆。
一方面,本发明还提供一种自生导热渗透水泥石的压裂方法。上述制备的压裂水泥浆被高压注入地层天然孔隙裂缝和压开人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;压裂水泥浆凝固后,自生具有高导热、高渗透、高强度、大缝面和微纳米孔的导热渗透水泥石,支撑和连通立体裂缝网。
一方面,本发明还提供一种上述自生导热渗透石的应用,上述自生导热渗透石应用于煤层气、页岩气、页岩油、可燃冰、地热、稠油等非常高能源的压裂增产开采。
本发明自中,通过导热剂、渗透剂和水泥的协同作用,本发明的压裂水泥浆进行压裂,自生导热渗透石的支撑和连通立体裂缝网,具有以下优势:
1.高导热:自生导热渗透石中的石墨烯、石墨、炭黑、活性炭等导热剂具有高导热、高传热的优异特性,特别是石墨烯的导热系数最高可达5300W/m·K,比常规加砂压裂石英砂的导热系数10W/m·K要高近5000倍,可大幅提高稠油热采、地热开采、煤层气热解吸、可燃冰热激发的导热距离、传热速度、换热效率,降低热采的能耗。
2.高渗透:自生导热渗透石的压裂水泥浆中的液态渗透剂,在地面泵注压裂时高分散溶解吸附在导热剂和水中呈溶液状态,便于压裂泵注和造缝;当压裂水泥水化凝固自动形成导热渗透石支撑裂缝网后,液态的渗透剂占据的可流动空间,形成大量微纳米级连通孔和立体微裂缝网高渗透通道。
3.高强度:该发明自生导热渗透石中的石墨烯、石墨等可提高水泥石的骨架强度,并且渗透石中形成的微纳级米连通孔和微裂缝使得水泥石骨架稳定好,抗压强度和剪切强度高,可大于纯水泥凝固形成的水泥石。不仅有利于增强压裂支撑缝的强度,保持支撑裂缝网不闭合长期有效,而且有利于加固煤层、页岩层、泥岩层、疏松砂岩层等,防止松软地层垮塌、出砂、出泥、出煤粉等。
4.大缝面:自生导热渗透水石的压裂水泥浆,在压裂过程中随着水泥浆不断变稠,粘度不断上升,有利于主裂缝的自动暂堵、立体转向和微裂缝的开启、造缝、扩缝、延缝,形成高导热、高渗透的立体裂缝网;由于自生导热渗透石中微纳米级的导热剂和水泥,比常规压裂液携带的毫米级支撑剂颗粒的直径小几百倍甚至上千倍,同样体积支撑裂缝的表面积大几百上千倍,有利于连通更多煤层气层、页岩气层、页岩油层的油气和地热层的热水等,提高压裂增产量、采收率和传导热效率。
5.用水少:该发明的自生导热渗透石的压裂水泥浆压裂,可以不用或少用前置压裂液,并且压裂水泥浆含水低、用量少。同样压裂缝表面积的压裂水泥浆进行压裂,比常规水力加砂压裂相比,节约用水50-90%。
6.环保好:自生导热渗透石的导热剂、渗透剂、水泥和水全是环境友好材料,不仅凝固后95%以上永久封固埋藏在地层裂缝中不返排出地面,而且导热渗透石的微纳米孔缝和石墨烯、活性炭等的高效吸附、过滤、净化作用,可防止地层泥砂、煤粉、岩石颗粒、高矿化度地层水等废水、废渣等大量污染物产出地面,有利于保护环境和节能减排。
7.成本低:自生导热渗透石的压裂水泥浆的应用,具有上述高导热、高渗透、高强度、大缝面、用水少和环保好等优势,可大幅降低非常规能源压裂增产的单位成本和提高开采经济效益。
附图说明
图1是本发明自生导热渗透石微观形态图。
具体实施方式
下面将结合附图对本发明作进一步说明。
实施例1压裂水泥浆制备与导热渗透石的测试
①将导热剂和渗透剂按照表一的比例,搅拌混合,分散均匀,制成5种混合剂。
②将①的混合剂、水、水泥按照表一的比例,搅拌混合,制成5种压裂水泥浆。
③将②的压裂水泥浆,分别按标准取样成模,养护28天,即得5种自生导热渗透石,分别对自生导热渗透石进行导热系数、有效孔隙率及抗压强度测试。导热系数测试方法参照ISO 22007-22008标准,有效孔隙率(真气孔率)测试方法参照GB9966.3-2001标准,抗压强度测定方法参照GB50107-2010标准,制备的五种对应的导热渗透石样的测试结果如下表二。
表一
表二
应用实施例1.直井单层压裂增产煤层气的应用
第一步,将实施例1任一制备的压裂水泥浆,每米煤层用量>5方,高压泵注入煤层进行压裂。该压裂水泥浆被压入煤层形成人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;
第二步:侯凝5-10天,全部压裂水泥浆凝固自生导热渗透石,双面支撑、连通立体裂缝网,成为高导热、高渗透、高强度、大缝面、不闭合的煤层气裂缝网产道。压裂水泥浆凝固自生导热渗透石支撑、连通立体裂缝网。压裂水泥浆水化凝固的水化热通过导热剂迅速传导到裂缝周围的煤层,有利于煤层气解吸和提高煤层渗透率;
第三步:开井自喷排采煤层气或下泵抽水排采煤层气。压裂渗透水泥浆中的水全都固化无压裂液返排,自生导热渗透石不仅有利于提高煤层气产量,而且可防止煤层坍塌、堵塞、出水、出煤粉。
应用实施例2水平井多段压裂增产页岩气的应用
第1步:将实施例1-任一制备的水泥浆,每米页岩气层水平段用量>1方,高压泵注入第一水平段页岩气层进行压裂。该压裂水泥浆被压入页岩气层形成人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;
第2步:关井1-2小时,压裂水泥浆开始稠化初凝,自动形成暂堵、封隔、转向,不用机械封堵该水平段就可自动转压下一更高破裂压力的水平段;
第3步:重复第1-2步,压裂第2-N水平井段,全井水平段自动形成立体裂缝网;
第4步:关井5-10天,压裂水泥浆全部凝固自生导热渗透石,双面支撑、连通全井水平段的立体裂缝网,成为高导热、高渗透、高强度、大缝面、不闭合的页岩气裂缝网产道。压裂水泥浆水化凝固的水化热,通过导热剂迅速传导到裂缝周围的页岩气层,有利于页岩气解吸、缝面吸水干裂增渗。
第5步:开井自喷排采页岩气或人工举升排采页岩气。压裂渗透水泥浆中的水全部和水泥一起固化凝固,无压裂液返排,有利环保减排。自生导热渗透石不仅有利于提高页岩气产量,而且可防止页岩层水化、膨胀、坍塌、堵塞、出水、出砂等。
应用实施例3水平井多段压裂增产页岩油的应用
第1步:将实施例1任一制备的压裂水泥浆,每米页岩油层水平段用量>1方,高压泵注入第一水平段页岩油层进行压裂。该压裂水泥浆被压入页岩油层形成人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;
第2步:关井1-2小时,压裂水泥浆开始稠化、初凝,自动形成暂堵、封隔、转向,不用机械封堵该水平段就可自动转压下一更高破裂压力的水平段;
第3步:重复第1-2步,压裂第2-N水平井段,全井水平段自动形成立体裂缝网;
第4步:关井5-10天,全部压裂水泥浆凝固自生导热渗透石,双面支撑、连通全井水平段的立体裂缝网,成为高导热、高渗透、高强度、大缝面的页岩油产道。压裂水泥浆水化凝固的水化热通过导热剂迅速传导到裂缝周围的页岩油层,有利于页岩油降粘流动和提高页岩油层的渗透率;
第5步:开井自喷采页岩油或下泵抽采页岩油。压裂渗透水泥浆不仅用水少,而且其中的水全都和水泥一起固化凝固,无大量压裂液返排,有利环保减排。自生导热渗透石不仅有利于提高页岩油产量,而且可防止松软页岩油层水化、膨胀、坍塌、堵塞、出水、出砂等。
应用实施例4直井单层压裂开采地热的应用
第一步:按照实施例1任一制备的压裂水泥浆,每米地热层用量>10方,高压泵注入导热渗透水泥浆进行压裂。该压裂水泥浆被压入地热层形成人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;
第二步:关井5-10天,全部压裂水泥浆凝固,自生导热渗透石支撑、连通立体裂缝网。不仅提高地热导热传热速度、蒸汽或热水产量,而且有利于防砂、清洁、过滤,防止地热层有害固体颗粒和矿物成分产出地面;
第三步:开井自喷采蒸汽或下泵抽热水。
应用实施例5直井多层压裂热采稠油的应用
第1步:按照实施例1任以一配制的压裂水泥浆,每米稠油水平段用量>5方,高压泵注入导热渗透水泥浆进行第1层压裂。该压裂水泥浆被压入稠油层形成人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;
第2步:关井1-2小时,压裂水泥浆开始稠化、初凝,自动形成暂堵、封隔、转向,不用机械封堵该水平段就可自动转压下一更高破裂压力的稠油层;
第3步:重复第1-2步,压裂第2-N稠油层,全井自动形成多层立体裂缝网;
第4步:关井5-10天,全部压裂水泥浆凝固自生导热渗透石,双面支撑、连通立体裂缝网。不仅提高稠油层渗透率、注入蒸汽或热水的热导热传热速度,而且有利于防砂、清洁、过滤,防止地热层有害固体颗粒和矿物成分产出地面;
第5步:注蒸汽吞吐开采稠油或注热水驱稠油。注入的蒸汽热水的热量通过自生导热渗透石的导热剂高效快速均匀传导到稠油层深远处,实现降低稠油粘度,加快稠油流动,提高稠油产量、最终采收率、节能减排和降本增效。
根据实际煤层气层、页岩气层、页岩油层、稠油层、地热层、可燃冰层等的井型、深度、厚度、压力、温度、孔隙度、渗透率、敏感性和油气水流体特性等进行模拟实验,可针对性优化压裂应用的配比、用量、注入方式等,并可加入其他增效添加剂和增减工序步骤。
以上所述仅为本发明的优选实施例,并不用于限制本发明。对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (9)
2.根据权利要求1所述的自生导热渗透石的压裂水泥浆,其特征在于,所述导热剂为石墨烯、石墨、活性炭、炭黑、木炭、竹炭、稻壳炭或其混合物。
3.根据权利要求1-2任一所述的自生导热渗透石的压裂水泥浆,其特征在于,所述渗透剂为液态水溶性的甲醇、乙醇、丙醇、丁醇、乙醚、聚乙二醇、聚乙二醇单甲醚、聚乙二醇双甲醚、聚乙烯亚胺、聚苯乙烯磺酸钠等有机物或其混合物。
4.根据权利要求1-3所述的自生导热渗透石的压裂水泥浆,其特征在于,所述水泥为油井水泥、硅酸盐水泥、铝酸盐水泥、硫铝酸盐水泥、铁铝酸盐水泥、氟铝酸盐水泥、磷酸盐水泥、火山灰水泥、矿渣水泥、粉煤灰水泥、树脂水泥或其混合物。
5.一种自生导热渗透石,其特征在于,所述自生导热渗透石由权利要求1-4任一所述的自生导热渗透石的压裂水泥浆制备而来。
6.一种权利要求1-4任一所述的自生导热渗透石的压裂水泥浆制备方法,包括以下步骤:
①取导热剂和渗透剂,搅拌混合,分散均匀成混合液;
②将①的混合液、水及水泥搅拌、混合形成压裂水泥浆。
7.一种制备权利要求5所述的自生导热渗透石的压裂方法,包括以下步骤:
①取导热剂和渗透剂,搅拌混合,分散均匀成混合剂;
②将①的混合剂、水及水泥搅拌、混合形成压裂水泥浆:
③将②的压裂水泥浆高压注入地层天然孔隙裂缝和压开人工裂缝后,不断水化、稠化、增粘,自动暂堵、转向、造缝、扩缝、延缝,形成立体裂缝网;压裂水泥浆凝固后,自生具有高导热、高渗透、高强度、大缝面和微纳米孔缝的导热渗透石,支撑立体裂缝网。
8.一种压裂水泥浆应用于煤层气、页岩气、页岩油、可燃冰、稠油、地热,其特征在于,所述压裂水泥浆为权利要求1-4任一所述的自生导热渗透石的压裂水泥浆。
9.一种导热渗透石应用于煤层气、页岩气、页岩油、可燃冰、稠油、地热,其特征在于,所述导热渗透石为权利要求5所述的自生导热渗透石。
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