不同聚合物协同作用对钻井液流变性能影响研究

Synergy influence of different polymer on the rheological property of drilling fluid

流型调节剂是影响钻井液悬浮、携带及稳定井壁能力的重要因素。本文对比了不同类型聚合物对典型水基钻井液流变性能的影响。结果表明:聚合物A单独使用且加量为0.3%时,钻井液表观粘度、动切力性能良好,但初、终切分别为2Pa、5Pa,难以满足现场使用要求。聚合物B和聚合物A协同使用时,初、终切分别为4Pa、6.5Pa,一定程度缓解聚合物A单独使用时初、终切不足的问题,但终切力和动切力仍未达到作业需求。聚合物C和聚合物A、B协同使用,聚合物C加量为0.2%时,初切力终切力达到6.5Pa和12Pa,远大于只加聚合物A和B的切力,符合现场作业要求。优化后各聚合物使用浓度为:聚合物A:0.3%;聚合物B:0.5%;聚合物C:0.2%。本文对HEM钻井液的现场使用及推广具有重要的指导意义。

Flow type regulator is an important factor affecting the ability of suspension,carrying and borehole wall stabilization of drilling fluid.The effects of different polymers on the rheological properties of typical water-based drilling fluids was studied.The results showed that when polymer A is used alone and the additive amount is 0.3%,the drilling fluid shows well apparent viscosity and yield point shear performance while the Gel strengths are 2Pa and 5Pa.It is difficult to meet the requirements on field.When polymer B and Polymer A are used together,the Gel strengths are 4Pa and 6.5Pa.Although they alleviate the problem of insufficient Gel strengths and yield point,the yield point are still not up to the requirements.When polymer C with the concentration of 0.2%is used in conjunction with polymer A and B,the initial and final shear forces reach 6.5Pa and 12Pa,which meet the requirements of field operation.It is far greater than the shear forces of the system contained polymer A and B.The optimized concentration of polymer A,polymer B and polymer C are 0.3%,0.5%and 0.2%,respectively.This paper has important guiding significance to the field application and popularization of HEM drilling fluid.