高性能聚阴离子纤维素处理剂的研制

Preparation of Polyanionic Cellulose with Excellent Performance

现在的石油钻井技术要求聚阴离子纤维素(简称PAC)具有更好的抗盐、抗钙和抗温性能。改进的高粘度PAC在盐水中能保持较高的粘度,在使用量减少的情况下,有更明显的增粘作用,在各种地质条件下具有稳定的流变性能。研究从抑制副反应考虑,对精制棉中的聚合度、α纤维素含量和氯乙酸中一氯乙酸含量进行了一系列的试验,从而制造出符合要求的具有良好流变性能、低滤失量、高粘度的改进PAC产品。研究表明,研制这种PAC,所采用的原料是:(1)精制棉的聚合度>2200,最好是>2300;α纤维素>98%,最好是>99%。(2)氯乙酸产品中一氯乙酸含量>97%,最好是>98%。

Current drilling technology requests that polyanionic cellulose (PAC) has the better properties to tolerate salt, calcium and temperature. Even if the using level of PAC is reduced, the improved PAC of high-viscosity can maintain not only a higher viscosity and a distinct thickening function in salt water, but also a stable rheology property in a wide variety of geological condition. Considering the control of by-reaction, we did a series of tests about polymer andαcellulose content in refined cotton, and about monochloroacetic acid (MCA) content in chloroacetic acid, so as to prepare the improved PAC suitable for excellent rheology, low filtrate volume and high viscosity. This research demonstrates that it is requested for preparing the improved PAC to use refined cotton with polymerization degree > 2 200, the best range > 2 300 andαcellulose content > 98%, the best range > 99%; and to use chloroacetic acid with MAC content > 97%, the best range > 98%.