耐高温阳离子聚合物压裂液的制备与性能研究

发布时间：2018-03-11 17:27

  本文选题：阳离子聚合物　切入点：压裂液　出处：《油田化学》2017年02期 　论文类型：期刊论文

【摘要】：为获得具有良好耐温抗剪切性能的聚合物压裂液,设计并合成了含阳离子基团的丙烯酰胺共聚物PAAD及配套有机钛交联剂TC,以PAAD为稠化剂、TC为交联剂、多羟基化合物MH为交联促进剂,制备了阳离子聚合物压裂液。研究了PAAD、TC、MH、pH值对压裂液性能的影响。结果表明,PAAD具有较强的增黏能力,可作为压裂液稠化剂使用;TC可在酸性条件下与聚合物PAAD交联形成聚合物冻胶;MH在高温条件下能与PAAD稠化剂反应,促进聚合物交联网络的形成,提高压裂液黏度及耐温性能。该压裂液的性能与体系组成有关,随聚合物PAAD浓度的增加,压裂液冻胶黏度增大,但PAAD加量超过0.6%后冻胶黏度增幅减小。在PAAD浓度一定的条件下,TC和MH均存在对应冻胶高黏度的最佳浓度值。体系pH值对压裂液的性能影响较大,pH=3数4时压裂液成胶性能较好。组成为0.6%PAAD+1.0%TC+0.2%MH(pH=3数4)的压裂液经150℃、170 s~(-1)连续剪切90min后的黏度仍保持在90 m Pa·s左右,满足150℃高温油气井压裂施工需要。
[Abstract]:In order to obtain polymer fracturing fluid with good temperature and shear resistance, acrylamide copolymer (PAAD) containing cationic group and organic titanium crosslinking agent (TCC) were designed and synthesized. PAAD was used as thickener and TC as crosslinking agent. A cationic polymer fracturing fluid was prepared by using the polyhydroxyl compound MH as a crosslinking accelerant. The effect of pH value on the properties of the fracturing fluid was studied. The results showed that PAAD had a strong viscosity increasing ability. It can be used as a thickener for fracturing fluid. It can be crosslinked with polymer PAAD under acidic conditions to form a polymer gel gel MH. At high temperature, it can react with PAAD thickener and promote the formation of polymer crosslinking network. The properties of the fracturing fluid are related to the composition of the system. The gel viscosity of the fracturing fluid increases with the increase of polymer PAAD concentration. However, when the dosage of PAAD exceeded 0.6%, the increase of gel viscosity decreased. Under the condition of constant PAAD concentration, both TC and MH had the best concentration corresponding to the high viscosity of gel. The pH value of the system had a great influence on the properties of the fracturing fluid. The viscosity of the fracturing fluid containing 0.6 PAAD 1.0 and TC 0.2 and pH 3 / 4) was maintained at 90 MPA 路s after continuous shearing at 150 鈩，

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