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介绍了零滤失井眼稳定剂及超低渗透钻井液完井液的组成。在水基、油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。对加入一定量零滤失井眼稳定剂钻井液的API滤失量、高温高压滤失量、砂床滤失量、高温高压砂床滤失量、岩心滤失量、岩心承压能力、封堵裂缝效果和岩心渗透率恢复值的变化进行了评价。实验结果表明,超低渗透钻井液的砂床滤失量不是时间平方根的函数,与API滤失量没有对应关系;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,可以实现零滤失;零滤失井眼稳定剂可以防漏堵漏;通过增强内泥饼封堵强度大幅度提高了岩心承压能力;能有效保护储层,岩心渗透率恢复值大于95%。
The composition of zero-loss borehole stabilizer and ultra-low permeability drilling fluid completion fluid is introduced. In water-based, oil-based drilling fluid by adding a certain amount of zero-loss borehole stabilizer can form ultra-low permeability drilling fluid. The results show that the API filtration loss, high temperature and high pressure filtration loss, sand bed filtration loss, high temperature and high pressure sand bed filtration loss, core filtration loss, core pressure bearing capacity, The effects of plugging cracks and core permeability recovery were evaluated. The experimental results show that the filtration loss of sand bed of ultra-low permeability drilling fluid is not a function of time square root, and has no correspondence with the filtration loss of API. Ultra-low permeability drilling fluid has a good seal for sand beds, cores and fractures of different pores The zero-loss borehole stabilizer can prevent leaks and plugging; the pressure-bearing capacity of cores can be greatly enhanced by enhancing the plugging strength of the inner mudcake; the recovery value of core permeability can be effectively protected Greater than 95%.