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在水基钻井液中加入一定量的零滤失井眼稳定剂可以形成超低渗透钻井液。介绍了几种超低渗透钻井液 性能测试方法——可视式中压砂床降滤失评价测试方法、高温高压砂床降滤失测试方法、高温高压岩心降滤失测试方 法及岩心承压能力测试方法。钻井液API降滤失与砂床降滤失试验表明,砂床滤失量不是时间平方根的函数,砂床 滤失量与API滤失量没有对应关系。高温高压岩心滤失量或滤液进入岩心的深度可以用来说明钻井液降滤失性及对 地层的封堵能力,钻井液的类型与性能对岩心承压能力具有重要的影响。超低渗透钻井液对不同孔隙的砂床、岩心和 裂缝具有很好的封堵能力,可以实现近零滤失;并能增强内泥饼封堵强度,从而达到提高岩心承压能力、漏失压力和 破裂压力梯度,扩大安全密度窗口的目的。
Add a certain amount of zero-loss borehole stabilizer in water-based drilling fluid to form ultra-low permeability drilling fluid. This paper introduces several testing methods of ultra-low permeability drilling fluid performance-visualized medium pressure sand bed filtration loss evaluation test method, high temperature and high pressure sand bed filtration loss test method, high temperature and high pressure core loss filtration test method and core pressure Ability test method. Drilling Fluid API Filtration Loss and Sand Bed Filtration Loss Tests show that the fluidized bed filtration loss is not a function of the square root of time, and there is no correspondence between the fluidized bed filtration loss and the API filtration loss. Core fluid loss at high temperature and high pressure or the depth of the filtrate into the core can be used to illustrate the fluid loss of drilling fluid and the sealing ability of the formation. The type and performance of drilling fluid have an important influence on core bearing capacity. Ultra-low permeability drilling fluid has good blocking ability for sandstone beds, cores and fractures with different pores, and can achieve near-zero fluid loss; and can enhance the sealing strength of inner mudcake so as to improve core bearing capacity and leakage pressure And break the pressure gradient, the purpose of expanding the security density window.