
第37卷第4期 2016年8月
文章编号:1001-3873(2016)04-0460-04
新疆石油地质
XINJIANGPETROLEUM GEOLOGY DOI:10.7657/XJPG20160414
聚合物酸液稠化剂对储集层的伤害
林鑫"2,张士诚",李小刚”,张汝生”,崔佳?
(1.中国石油大学石油工程学院,北京102249;2.中国石化石油勘探开发研究院,北京100083
3.西南石油大学油气藏地质及开发工程国家重点实验室,成都610500)
Vol.37,No.4 Aug.2016
摘要:酸压措施中常用酸液的稠化剂大多是采用聚丙烯酰胺类的高分子聚合物。这些稠化剂降解后仍然具有一定的黏度,酸压施工后残留在地层中造成储集层伤害,直接影响酸压效果。配制了3类聚合物酸液稠化剂的残酸(胶凝酸、交联酸和温控变粘酸),针对这3类残酸对碳酸盐岩高渗岩心和低渗岩心渗透率伤害进行了实验,实验结果表明, 3类酸液的残酸对碳酸盐岩高渗岩心的基质渗透率伤害率要大于对低渗岩心的伤害率,即岩心初始渗透率越大,孔隙越发育,受大分子聚合物降解产物的伤害越严重。3类酸液的残酸所产生的滤饼对岩心渗透率的伤害率都相对较低,不是导致储集层伤害的主要因素。
关键词:胶凝酸;交联酸;温控变黏酸;稠化剂;渗透率;储集层伤害;基质伤害率;滤饼伤害率
中图分类号:TE357.43
文献标识码:A
Damageof PolymerAcidViscosifiertoReservoirs
LIN Xin", ZHANG Shicheng, LI Xiaogang, ZHANG Rusheng, CUI Jia
(1.School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China; 2.Research Institute of Petroleum Exploration& Development, Sinopee, Beijing 100083, China; 3.State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest
Petroleum University, Chengdu, Sichuan 610500, China)
Abstract: Commonly-used acid viscosifiers during acid fracturing are mostly high-molecular polymers of polyacrylamide, These viscosifi-ers still have some viscosity after degradation and remain in formations after acid fracturing, which may cause damages to reservoirs and in-fluence the acid fracturing effect directly. 3 types of residual acids of polymer acid viscosifier (gelled acid, crosslinked acid and temperature controlled sticking acid ) are prepared, and experiments on the damages of these 3 residual acids to high-permeable and low-permeable carbonate cores are carried out. The results show that all the 3 residual acids have greater damages to matrix permeability of high-perme-able carbonate cores than that of low-permeable cores, ie, the larger the initial core permeability and, the more developed the core pores are, the more serious the damage from products degraded by large-molecule polymers will be, However, the filter cakes produced by the 3 residual acids have relatively low damages to core permeability, which might not be the key factorfor the reservoir damage.
Keywords: gelled acid; crosslinking acid; temperature-controlled sticking acid; viscosifier; permeability; reservoir damage; matrix damage
rate filter cake damage rate
酸化压裂是碳酸盐岩储集层增产改造的重要措施之一。稠化剂和交联剂等高分子聚合物是酸化压裂作业时酸液体系里的主要添加剂,交联后的高分子聚合物在地层中的残留,是引起储集层伤害的主要因素,直接影响酸压效果"-"。目前,针对致密砂岩储集层压裂时所用的植物胶压裂液对储集层的伤害研究较为广泛,文献[3]通过基质伤害实验和滤饼伤害实验,定量分析胍胶压裂液稠化剂分子对低渗透砂岩气藏储集层的伤害;文献[4]和文献[5]对滤液的微观结构特征及其对岩心伤害的微观现象进行研究;文献[6] 研究了胍胶压裂液伤害对储集层导流能力的影响;文献[7]研究了准噶尔盆地阜东斜坡区头屯河组特低渗透砂砾岩岩心的胍胶压裂液伤害;文献[8]和文献[9]
收稿日期:2016-02-26
修订日期:2016-06-12
基金项目:国家科技重大专项(2016ZX05014-005-004)
研究了合成聚合物压裂液残留与滤失情况及其对地层的伤害。由于针对碳酸盐岩储集层酸压造成的储集层伤害机理研究和评价比较少见,本文借鉴了已报道的胍胶压裂液对砂砾岩岩心伤害的研究方法,模拟酸液的残酸对碳酸盐岩储集层渗透率伤害实验-"。从储集层保护的角度出发,酸液优化缺乏理论和实验数据指导,故分析酸液体系,尤其是酸液反应后降解产物对储集层伤害的原因及程度,探讨其伤害机理,对优化酸液体系、降低储集层伤害、获得高导流能力酸蚀裂缝、提高酸压效果具有重要意义2-1。本文参考石油天然气行业标准SY/T5358—2010《储层敏感性流动实验评价方法》中推荐的基质伤害测试方法进行实验,并在此基础上做了一定的改进。改进方法可
作者简介:林鑫(1982-),男,四川遂宁人,工程师,博士研究生,油气田开发,(Tel)13810603373(Email)linxin.syky@sinopec.com 万方数据