动切力

研究了亚硫酸氢钾与甲醛用量、体系pH值、反应温度与时间、共聚物磺化度对泥浆表观粘度、动切力及失水量的影响。

PH value of the system . reaction temperature and time . sulfonation level of the copolymer on apparent viscosity , dynamic shear and water loss of mud has Been studied .

结果表明：WTZN无固相钻井液增粘剂增粘、提高动切力效果好，有利于提高钻井液携带岩屑能力；

The result shows that the WTZN clay-free drilling fluid viscosifier is quite effective and improves dynamic shear force and cutting carrying ability .

泡沫钻井流体动切力和塑性粘度的温度压力关系

Temperature / Pressure Relationships of Yield Stress and Plastic Viscosity for Foamed Drilling Fluids

分析了钻井液零滞留临界静切力与密度差、水泥浆动切力、井眼与套管尺寸组合的关系。

On basis of the analysis , a method is put forward to calculate the gel strength for cementing without drilling fluid retention .

研究表明，误差随着裂缝宽度、压力梯度和流型指数增加而降低，随着动切力增加而增加。

Results show that the error decreases with the increase of fracture aperture , the pressure gradient and flow behavior index and increased with the increase of the yield stress .

然后应用流体力学理论，推导出最优水泥浆动切力的计算公式，为现场注水泥作业提供了理论依据。

The calculating formula of optimum yield point of cement slurry in cementing has been deduced upon fluid mechanics , which can be taken as the theoretical basis of cementing calculation in oilfield .

在室内实验研究中发现，加入1%～3%JCP1的聚合物钻井液，其漏斗粘度、滤失量、塑性粘度和动切力变化很小；

In laboratory experiments it is found that the funnel and plastic viscosities , filtrate loss , and yield stress of the polymer fluid with and without 1-3 % of JCP 1 added are close each to other ;