腐殖酸高温堵水剂的制备及评价

Preparation and Evaluation of Humic Acid Used in High-temperature Reservoirs

研究了以腐殖酸为主要成分的耐高温体系,考察了腐殖酸钠质量分数、交联剂质量分数、pH值、矿化度的变化对堵水剂性能的影响,在此基础上,通过正交实验得出一个最优配方,最后对该最优配方进行了评价,结果表明,该堵水剂基液初始粘度为1.4mPa·s,易于输送和泵入,成胶时间为19h,成胶后的强度可达到0.08MPa,适用的pH值为6～10,最高可耐220℃的高温,综合性能好且腐殖酸廉价易得,可用于高温低渗透油田的堵水作业。

This paper explored a new plug agent which made mainly from humic acid. The influences of concentration of humic acid,cross linking agent, temperature, pH value and salinity were also studied. Base on this,this paper used orthogonal table to optimize the formulation. The evaluation result indicates that its initial dynamic viscosity is 1.4 mPa·s,which can easily reach deep formation. The gelation time is 19h and gelation strength can reach 0.08 MPa.The suitable pH is 6~10 and utmost thermo stability can reach 220℃. Owing to its combination property,it is very fit for high temperature and low permeable reservoir and water shutoff job.