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高密度水基钻井液固相含量高,流变性调控难度大,选择常用的重晶石作为加重剂,研究了重晶石粒度级配对高密度水基钻井液流变性的影响。在理论分析和室内试验基础上,确定了多级级配和两级级配方案,考察了两种方案加重钻井液后流变性能变化。试验结果表明,合理粒度级配后重晶石的固相黏度效应降低,钻井液流变性明显改善,与采用未分级重晶石加重钻井液相比,多级级配和两级级配方案配制的钻井液塑性黏度最多分别降低了19%和17%,最优粒度级配为多级级配(>37μm):(<20μm)>1,两级级配(>53μm):(<37μm)=1:1;重晶石粒度两级级配方式更适用于实际操作。
The high-density water-based drilling fluid has high solid content and difficult rheology control. The commonly used barite is selected as the weighting agent to study the influence of particle size gradation on the rheology of high-density water-based drilling fluids. Based on the theoretical analysis and laboratory tests, the multi-level gradation and the two-level gradation scheme were determined, and the rheological properties of the two solutions were investigated after aggravating the drilling fluid. The experimental results show that the solid-phase viscosity effect of barite decreases with reasonable particle size gradation, and the rheological properties of drilling fluid are obviously improved. Compared with the unburnt barite aggravating drilling fluid, the multi-level gradation and the two-stage gradation formula preparation (> 37μm): (<20μm)> 1, two-level grading (> 53μm): (<37μm), the maximum viscosity of drilling fluid decreased by 19% and 17% = 1: 1; barite particle size two-level grading is more suitable for practical operation.