酸性有机钛交联剂的合成及在压裂液中的应用  

Synthesis and Application of Acidic Organic Titanium Cross-Linking Agent for Fracturing Fluid

作　　者：马悦[1] 李小瑞[1] 杨晓武[1] 环灿灿 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《精细化工》2014年第6期765-769,共5页Fine Chemicals

基　　金：国家自然科学基金项目(51373091);咸阳市科技计划项目(2013jk05-06)~~

摘　　要：以钛酸丁酯为主剂,多元醇为络合剂合成了一种酸性有机钛交联剂,并以部分水解聚丙烯酰胺作为稠化剂,制备了部分水解聚丙烯酰胺压裂液。研究了交联剂中钛酸丁酯的质量分数,丙三醇与乳酸的质量比以及pH对冻胶交联延时、黏度的影响,得到较佳的合成条件。考察了质量分数为0.5%的部分水解聚丙烯酰胺,m(HPAM)∶m(有机钛)=100∶0.5时,有机钛/部分水解聚丙烯酰胺压裂液的性能,交联延时300 s;在95℃,170s-1的条件下连续剪切90 min,黏度保持在50 mPa·s以上,体系耐温耐剪切性能良好;由线性黏弹性范围内动态频率扫描结果可知,G'>G″,是典型的黏弹性流体;常温下,V(压裂液)∶V(石英砂)=100∶30时,沉降速度0.025mm/s;破胶后,破胶液黏度低于5.0 mPa·s且残渣量较低,对储层伤害小。Using tetrabutyl titanate as the main agent, polyhydric alcohol as the complexing agent, a type of acidic organic-titanium cross-linking agent was synthesized, in which HPAM was used as a thickener. The study has examined the effects of the content of butyl titanate, the ratio of complexing agent and the pH value on the delayed gelling and the viscosity. The performance of the organic titanium/HPAM fracturing fluid shows that：the delayed time was 300 s, the viscosity of the system was still higher than 50 mPa·s after shearing for 90 min at the temperature of 95℃ with the shearing rate of 170 s-1 ,so the fracturing fluid possessed good temperature tolerance and shearing resistance. By the results of the dynamic frequency scanning, G′ 〉 G″, so it is a typical viscoelastic fluid. When the sand ratio was 30% in volume,settling velocity was 0. 025mm/s. It is less harmful to reservoir because the viscosity of the gel breaking liquid is lower than 5.0 mPa·s and the residue content is low after gel breaking.

关 键 词：有机钛交联剂 部分水解聚丙烯酰胺 压裂液 延时性 流变性 油田化学品与油品添加剂 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]