纳微米防塌钻井液技术的研究与应用

Study and Application of Anti-sloughing Drilling Fluid Containing Nano-micro Plugging Material

陈金霞

CHEN Jinxia

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Na2SO3+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。图7表6 参10

In order to resolve the wellbore stability of hard-brittle shale of Nanpu oilfield with nano-micro pore throat of shale，nano-micron plugging material HSM and HGW was introduced and the recipe of the micro-nano and anti-sloughing drilling fluid，composed of 3% bentonite muds， 1.2% tackifier DSP-2， 6% filtrate reducer SPNH， 3% filtrate reducer SMP-I， 1% viscosity-reducer SMT，0.5% inhibitor AI-1，0.8% heat stabilizer Na2SO3，1% micron plugging agent FT3000，5% KCl，2% Waterproof lock agent HAR-D，2% nano plugging agent HSM and 3% submicron plugging agent HGW，was determined.Meanwhile，the filtration property，plugging property，and anti-sloughing inhibitive of the obtained drilling fluid was studied. The results showed that the addition of 2%HSM and 3%HGW could increase the membrane efficiency from 0.21 to 0.38，reduce the filter loss by more than 35%，decrease the PPT filtrate loss and initial filtration rate，and delay the pressure transmission. The drilling fluid had favorable filtration property，plugging property，and inhibitive. After being aged at the temperature of 150℃ for 16 h，the API and HTHP filter loss of the drilling fluid was 3.7 mL and 11 mL，respectively；the linear expansion ratio of the bentonite sheeting after being soaked in the drilling fluid for 24 h was only 13.29%，the rolling recovery of mudstone debris in the drilling fluid after aging for 16 h at the temperature of 150℃ was 93.3%. Field application showed that the drilling fluid could improve borehole quality with regular borehole gauge effectively，and the drilling speed was 35.29% higher than that of the adjacent wells. The multiple purposes of well stability，reservoir protection and optimized drilling was achieved.

10.19346./j.cnki.1000-4092.2017.03.005