新型硅酸盐无渗透钻井液的研究与应用

Study and Application of a New Silicate Non-Permeable Drilling Fluid

将硅酸盐和无渗透钻井液有机结合在一起,研制了新型硅酸盐无渗透钻井液体系。试验证明,该钻井液具有良好的防塌抑制性,较强的抗盐、抗劣土污染能力,在高温高压条件下形成的无渗透泥饼的承压能力达15.0 MPa。该钻井液体系在准噶尔盆地中部3区块永9井4 318.00-5 895.00 m井段进行了应用,较好地解决了215.9 mm井眼吐谷鲁群复杂井段严重阻卡问题,平均井径扩大率为13.86%,与未应用该钻井液的永1井、永2井和永6井的井径扩大率相比,分别降低了30.77%、17.91%和5.31%,取得了良好的防塌抑制、非渗透和保护油气层效果,创造了硅酸盐钻井液应用井深、井段之长和区块井身质量等多项纪录。

A novel silicate non-permeable drilling fluid is developed by integrating silicate with nonpermeable drilling fluid. Evaluating tests show that this novel silicate non-filtration has good properties in anti-sloughing and prohibition,anti-salt and anti-pollution, and the pressure-bearing capacity of filter cake is over 15.0 MPa at HTHP. This drilling fluid was applied in 4318.00--5895.00 m interval on Well Yong- 9 in third block, middle Zhunggar Basin. Pipe sticking commonly occurred to 215.9 mm sloughing wellbore in complicated Tuguluqun hole section was solved. The average hole enlargement is 13.86 %, which is reduced by 30.77%, 17.91% and 5.31% compared to wells Yong-1, Yong-2 and Yong-6 without usingthis fluid. The drilling fluid performs good anti-sloughing and reservoir protection capability and sets several records in application depth, length of hole section, wellbore quality, etc.