低浓度香豆胶硼交联体系研究及应用

发布时间：2018-01-03 08:12

  本文关键词：低浓度香豆胶硼交联体系研究及应用　出处：《中国地质大学(北京)》2016年硕士论文　论文类型：学位论文

  更多相关文章： 香豆胶 有机硼交联剂 压裂液 响应面法

【摘要】：压裂液是保证油田增产增注,保障压裂施工成功进行的关键所在,关系着压裂成本和压裂施工的成败,因此研究并开发满足油气田开发需要的低浓度压裂液体系具有重要的研究意义和实用价值。本文在研究有机硼交联剂与香豆胶交联机理的基础上,合成了中高温地层香豆胶专用有机硼交联剂OB-90,将响应面法应用于有机硼香豆胶体系优化,采用中心复合设计法,以香豆胶浓度、交联剂浓度、温度为考察指标,对实验获得的数据进行多元线性回归,同时用建立的回归模型进行优化,选取较低浓度的香豆胶压裂液体系并验证。优选并评价了助排剂和粘土稳定剂的性能后,形成中高温地层有机硼低浓度香豆胶压裂液体系,对体系的流变性能、滤失性能、破胶性能以及配伍性进行测试。具体结论如下:1.合成了香豆胶专用有机硼交联剂OB-90,使用该有机硼交联剂制备0.4%、常规香豆胶压裂液最高耐温可达135℃,在80℃、170s-1下剪切60 min后,冻胶粘度保持在250mPa·s。2.基于CCD法得出优化配方,在80~120℃下,香豆胶加量为0.175%~0.35%,经170s-1(包括1000 s-1下高速剪切2min)剪切95min后的冻胶黏度约为52 mPa·s~154 mPa·s。结果表明,该方法预测性良好,优化出的低浓度香豆胶体系具有良好的耐温耐剪切性。3.耐中高温有机硼低浓度香豆胶压裂液冻胶的流变性能与滤失性能均满足标准要求,加入助排剂可以有效降低破胶液的表面张力,破胶残渣较常规香豆胶配方降低了42%,可大大减少压裂液破胶液对储层的伤害,破胶液与地层流体配伍,混合无沉淀,无絮凝,破乳率在95%以上。
[Abstract]:Fracturing fluid is the key to ensure oil field increase production and increase injection and ensure the success of fracturing operation. It is related to the cost of fracturing and the success or failure of fracturing operation. Therefore, it is of great significance and practical value to study and develop fracturing fluids with low concentration to meet the needs of oil and gas field development. This paper studies the mechanism of crosslinking of organic boron crosslinker and coumarin. The special organic boron crosslinking agent OB-90 for medium and high temperature formation was synthesized. The response surface method was applied to optimize the organic boron bean gum system. The central composite design method was used to determine the concentration of coumarin and crosslinking agent. Temperature is used as the index of investigation, the data obtained from the experiment are regressed by multivariate linear regression, and the established regression model is used to optimize the model. Select and verify the fracturing fluid system with lower concentration of Xiangbean gum. After selecting and evaluating the properties of drainage aid and clay stabilizer, the fracturing fluid system of organic boron and low concentration coumarin is formed, and the rheological properties of the fracturing fluid are obtained. The properties of filtration, gel breaking and compatibility were tested. The specific conclusions are as follows: 1. The special organic boron crosslinking agent OB-90 was synthesized, and the organic boron crosslinking agent OB-90 was used to prepare 0.4%. The maximum temperature resistance of the conventional seed-bean gum fracturing fluid is 135 鈩，

本文编号：1373099