石油与天然气化工Issue(3)：279-283,5.DOI:10.3969/j.issn.1007-3426.2014.03.013
可回收再利用的低分子胍胶压裂液技术研究
Technology research of the recycled low molecular guar gum f racturing fluid
熊颖 1刘友权 1石晓松 1张永国 1吴文刚 1黄晨直 1陈楠1
作者信息
摘要
Abstract
To solve the problems of water shortage in fracturing operation and fracturing out-let liquid handling difficulty ,the borate dissociation equilibrium principle is controlled by pH val-ue to change the crosslinked state of guar gum fracturing fluid for the degradability of gel break-ing under acidic condition .The molecular structure of guar gum is not damaged ,so it can be crosslinked again .This paper used the biodegradation technology to degrade guar gum ,and con-trolled the molecular weight of the guar gum by controlling the degradation conditions to control the degree of degradation of guar gum ,eventually a low molecular crosslinked guar gum have been developed with molecular weight from 30 × 104 to 50 × 104 under the condition of borate . The viscosity of aqueous solution of the low molecular guar gum was low ,and the water insoluble content was less than or equal to 4% .Taking a solid acid as a capsule core ,a polymer being grad-ually dissolved in the w ater as the capsule dressing ,a capsule breaker have been prepared using the method of air suspension film .The capsule breaker is not acidic on the ground for ensuring the fracturing fluid to be crosslinked well ,and under formation temperature and pressure condi-tions the capsule breaker can gradually release the solid acid for the fracturing fluid degradability gel breaking .Taking the low molecular guar gum as the thickening agent ,the capsule breaker parceling solid acid as the breaker ,a recycled low molecular guar gum fracturing fluid has been developed .The fracturing fluid has been widely used in Sichuan Xu Jiahe reservoir reconstruction ,and a lot of fracturing outlet liquids have been recycled .The effect of energy conservation and emissions reduction is remarkable .关键词
压裂液/回收/胍胶/低分子/压裂返排液Key words
fracturing fluid/recycling/guar gum/low molecular/fracturing outlet liquid分类
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熊颖,刘友权,石晓松,张永国,吴文刚,黄晨直,陈楠..可回收再利用的低分子胍胶压裂液技术研究[J].石油与天然气化工,2014,(3):279-283,5.
