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为探索目前可以应用和正在使用的几种类型钻(压)井液的适用性及最优配方,本文对其流型和稀释效应、渗透恢复能力、破壁效果、对地层的适应性、对水质污染、成本等,进行了初步试验分析。一、流型与稀释效应剪切稀释效应可用动塑比I_d和剪切稀释指数I_m表示,即I_d=τ_d/μ_p(1)和I_m=(1+(?)_0~(1/2))~2(2)式中τ_d——动切力(达因/厘米~2);μ_p——塑性粘度(厘泊);r_0——当量剪切速率(秒~(-1))据试验结果(从略)表明:(1)当细分散泥浆的固相含量相同时,其视粘度A_V
In order to explore the applicability and the optimal formula of several types of drilling and pressure fluids that can be applied and being used at present, this paper analyzes the flow pattern and dilution effect, permeability recovery ability, wall breaking effect, stratigraphic adaptability, Water pollution, costs, conducted a preliminary test analysis. First, the flow pattern and the dilution effect Shear dilution effect available plastic ratio I_d and shear dilution index I_m that I_d = τ_d / μ_p (1) and I_m = (1 + (?) _ 0 ~ (1/2)) ~ 2 (2) where τ_d-- dynamic shear (dyne / cm ~ 2); μ_p-- plastic viscosity (cps); r_0-- equivalent shear rate (Omitted) shows: (1) When the finely dispersed slurry has the same solid content, its apparent viscosity A_V