纳微米防塌钻井液技术的研究与应用

发布时间：2018-02-12 14:38

  本文关键词： 井壁稳定 纳微米封堵 防塌钻井液 硬脆性泥岩　出处：《油田化学》2017年03期 　论文类型：期刊论文

【摘要】：为了解决南堡深层泥页岩因纳微米级孔缝发育而易发生井壁失稳的问题,通过对纳微米级封堵材料的优选,确定了配方为3%膨润土浆+1.2%增黏剂DSP-2+6%降滤失剂SPNH+3%降滤失剂SMP-I+1%降黏剂SMT+0.5%聚胺抑制剂AI-1+0.8%热稳定剂Na_2SO_3+1%微米封堵剂FT3000+5%抑制剂KCl+2%防水锁剂HAR-D+2%纳米封堵剂HSM+3%亚微米固壁剂HGW的纳微米防塌钻井液体系,研究了该钻井液体系的滤失性、封堵性以及防塌抑制性等性能。结果表明,2%纳米级胶束封堵剂HSM与3%亚微米级固壁剂HGW复配使用可使基浆的膜效率从0.21提高到0.38,使纳微米级滤膜的滤失量降低35%以上,同时能降低PPT滤失量和初始滤失速率,大幅度减缓了对泥页岩的压力传递时间。该钻井液体系具有良好的降滤失性、封堵性和抑制性,在150℃下老化16 h后的API滤失量和HTHP滤失量分别为3.7 mL和11 mL,膨润土压片在该钻井液中的24 h线性膨胀率仅为13.29%,泥岩岩屑在该钻井液中150℃下热滚16 h后的回收率高达93.3%。该体系在南堡油田矿场试验中取得了显著效果,井眼质量得到有效改善,未发生垮塌、掉块等井壁失稳情况,机械钻速较邻井提高了35.29%,实现了深层泥页岩的井壁稳定与优快钻井的多重目的。
[Abstract]:In order to solve the problem that Nanbao deep shale is prone to wellbore instability due to the development of nanometer-sized pore fractures, the optimal selection of nanometer-sized plugging materials is carried out. The formulation of 3% bentonite slurry 1.2% tackifier DSP-2 6% filtration reducer SPNH 3% filtration reducer SMP-I 1% viscosity reducer SMT 0.5% polyamine inhibitor AI-1 0.8% heat stabilizer Na_2SO_3 1% micron plugging agent FT3000 5% inhibitor KCl 2% waterproof lock agent HAR-D 2% waterproofing agent HAR-D 2% was determined. Nano-micron anti-sloughing drilling fluid system of HSM 3% sub-micron wall fixing agent HGW, The filtration properties of the drilling fluid system are studied. The results show that the combination of 2% HSM and 3% submicron HGW can increase the membrane efficiency of the slurry from 0.21 to 0.38, and reduce the filtration capacity of nanometer-sized filter membrane by more than 35%. At the same time, the PPT loss and initial filtration rate can be reduced, and the pressure transfer time to shale is greatly reduced. The drilling fluid system has good filtration reduction, plugging and inhibition. After aging at 150 鈩，

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