低浓度胍胶压裂液体系的室内研究.pdf

第42卷第10期
应用化工
Vol 42 No 10
13年10月
Applied Chemical Indust
Oct.2013
低浓度胍胶压裂液体系的室内研究
张额,陈大钓2,刘彦锋',李俊莉,刘世川,任海晶
(1.陕西省石油化工研究设计院,陕西西安710054;2.西南石油大学化学化工学院,四川成都610500
摘要:采用水溶性好、残渣少的超级胍胶CHPG作低浓度胍胶压裂液的稠化剂,选用自制的有机硼交联剂SQ,低
浓度胍胶压裂液体系配方为0.20%CHPG+0.08%有机硼交联剂SQ+0.1%Na2CO3+0.15%助排剂+0.05%
破乳剂+0.1%杀菌剂+0.025%破胶剂+1.0%粘土稳定剂。体系在60℃下连续剪切120min后,貓度仍保持
在240mPa?s以上,单粒石英砂静态悬砂速度<0.25cm/min,30%砂比的静态悬砂速度<0.51cm/min,压裂液2h
内彻底破胶,破胶液表面张力29.4mNV/m,静态滤失系数为5.27x10-m/min'2,岩心伤害率17.51%。其稠化剂
的质量分数仅为0.2%,有效降低对地层伤害及原材料成本,其有机硼交联剂SQ具有一定的自动破胶特性,80℃
时36h彻底破胶,40℃时48h彻底破胶,与常规破胶剂配合使用,可缩短破胶时间,实现2h彻底破胶。
关键词:压裂液;低浓度;有机硼交联剂;自动破胶;低伤害
中图分类号:TQ041.8
文献标识码:A
文章编号:1671-3206(2013)10-1836-03
Laboratory research for low-concentration guanidine gum
fracturing fluids
ZHANG Ying, CHEN Da-jun, LIU Yan-feng LI Jun-li, LIU Shi-chuan REN Haijing
(1 Shaanxi Research and Design Institute of Petroleum and Chemical Industry, Xi an 710054, China; 2. College of
Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
Abstract: The GHPG possessing good water-solubility and less residue is employed as thickening agent of
low concentration guanidine gum fracturing fluid with home-made organoboron crosslinker $@. The low
concentration fracturing fluid formulation is composed of 0. 20% GHPG, 0.08% organoboron crosslinker
SQ,0. 1% Nac, 0. 15% cleanup additive,.05% demulsifier,0. 1 bacteria inhibitor, 0.025%gel
breaker and 1% clay stabilizer. Its viscosity remains above 240 mpa. s after continuous shearing as long
as 120 min at 60 C. The static suspending sand speed of single quartz sand<0.25 cm/min, and it
0.51 cm/min aimed at 30% sand content. The fracturing fluid can achieve thoroughly gel breaking within
2 h After gel breaking liquid, the interfacial tension of the liquid is 9.4 m/m, static filtration coeffi
cient is 5. 27 x 10 "m/min" and the core damage rate is 17. 51%o. Its thicking agent mass fraction is just
0.2% which can effectively reduce the damage to the reservoirs and the material cost. Futhermore, the or-
ganoboron crosslinker SQ has a certain characteristic in automatic gel breaking and can achieve thoroughly
el breaking costing 36 h at 80 C or costing 48 h at 40C. And to reduce the gel breaking time, it can be
used with conventional gel breaker to achieve the gel breaking within just 2 h
Key words: fracturing fluid; low concentration; organic boron crosslinker; automatic breaker; low dam
随着油气田勘探开发的不断深人,低渗透油田前,现场使用最多的是胍胶压裂液体系。胍胶压裂
已成为我国陆上石油工业稳定发展的重要潜力,是液破胶后产生的残渣驻留在地层裂缝中,使地层渗
未来石油工业可持续发展的主要研究方向。压裂是透率下降,导致压裂改造效果降低。因此适当降低
实现低渗油气藏经济开发的有效技术手段,是油气胍胶用量,对于减少地层伤害,降低施工成本具有重
井增产、注水井增注的一项重要技术措施。在压裂要意义。
施工过程中,压裂液的好坏成为关键因素。目
为保证低浓度下胍胶交联后的性能,实验采用
收稿日期:2013-03-26修改稿日期:2013-04-28
作者简介:张颖(1985-),男,重庆人,陕西省石油化工研究设计院助理工程师,硕士,主要从事油田工作液及油田化学品
的研究。电话:1502902782,E-mail:zhangying53@163.com