用于低渗透油田的腐殖酸高温堵剂研究

主要研究了一种耐高温体系，该体系由腐殖酸钠、甲醛，增强剂和0.02％的HPAM溶液四部分组成，考察了腐殖酸钠质量分数、甲醛质量分数、pH值、矿化度的变化对堵剂性能的影响，通过正交实验得出堵剂的最优配方并对该配方进行了评价。结果表明，该堵剂基液初始粘度为10mPa·s，易于输送和泵入，成胶时间18h，成胶后的强度为0.087MPa，最佳适用的pH值范围为7～9，具有良好的耐温抗盐能力、长期稳定性、封堵性能及廉价等优点，在高温低渗透油田具有广阔的应用前景。

HUMIC ACID PLUG AGENT USED IN HIGHTEMPERATURE AND LOW PERMEABLE RESERVOIRS

A new plug agent which is made mainly from humic acid,formaldehyde,strength agent and 0.02% HPAM solution is studied.The influences of concentration of humic acid,cross linking agent,temperature,pH value and salinity on the property of the agent are studied,too.Orthogonal test is conducted to optimize the formulation and evaluation.The result indicates that its initial velocity is 10mPa·s,which can easily reach deep formation.The gelation time is 18h and gelation strength 0.087MPa.The excellent application range of pH value is 7~9.The properties include temperatureresistance and antisalt,long term stability,good plugging ability and low cost,it is very suitable for high temperature and low permeable reservoirs.