微乳液提高井壁稳定性实验研究

发布时间：2018-01-16 08:31

本文关键词：微乳液提高井壁稳定性实验研究　出处：《钻井液与完井液》2017年01期 　论文类型：期刊论文

【摘要】：泥页岩微裂缝发育、封堵难度大,滤液在渗透压、毛细管力和化学势差等驱动力的作用下,会迅速进入地层深处,最终导致井壁失稳。研制了一种微乳液配方,通过粒度分布实验考察了微乳液的稳定性,并通过压力传递和页岩膨胀实验研究了其稳定井壁机理。所配制的微乳液具有良好的稳定性,在考察的静置时间内粒度保持稳定,虽稀释后液滴粒径略有增大,但当稀释倍数超过20倍后液滴粒径不再发生变化,微乳液还具有良好的抗温性,抗温达150℃。稀释后的微乳液液滴粒径中值在30 nm左右,能够进入泥页岩内部,而且在一定矿化度下会发生聚合形成大颗粒,当NaCl浓度增大到5.0%时纳米尺度的液滴已经消失,当CaCl_2浓度超过0.2%时液滴粒径中值达数百纳米,并通过吸附聚结停留在孔道内部,从而提高封堵效果。接触角实验表明,该微乳液可以显著改变泥页岩的润湿性,使其亲水性转变为具有一定疏水性,微乳液还能够降低表面张力,加量2%为时表面张力降低到31.4 m N/m,因此其具有一定的抑制能力。制备的微乳液与现场钻井液具有良好的适用性,对钻井液流变性影响不明显,能够提高泥饼质量,改善钻井液的滤失性。
[Abstract]:Shale fracture, plugging difficult, filtrate under osmotic pressure, capillary pressure and chemical potential difference driving force, will quickly enter the deep stratum, resulting in wellbore instability. A microemulsion formulation was developed by particle size distribution were studied. The stability of microemulsion, and through the pressure transfer and Study on the mechanism of borehole stability of shale swelling experiment. The prepared microemulsion has good stability, the static time granularity remained stable, although after dilution of the droplet size increases slightly, but when the dilution ratio is more than 20 times after the droplet size did not change, but also has a good anti microemulsion the temperature and temperature resistance up to 150 degrees Celsius. After dilution of the microemulsion droplet particle size around 30 nm, can enter the shale, and polymerized to form large particles in a certain degree of mineralization, when the concentration of NaCl increases to 5% nanometer scale The droplet degree has disappeared, while the concentration of CaCl_2 exceeded 0.2% liquid droplet size up to hundreds of nanometers, and the adsorption coalescence remain in the pores, so as to improve the sealing effect. That contact angle experiments, the micro emulsion can significantly change the wettability of shale, the hydrophilic to hydrophobic microemulsion, also can reduce the surface tension, and the 2% is the surface tension decreased to 31.4 m N/m, so it has a certain inhibition ability. The preparation of microemulsion and the drilling fluid has good applicability, the influence of drilling fluid rheology is not obvious, can improve the quality of mud cake, improve drilling fluid filter lost.

【作者单位】：中石化胜利石油工程公司钻井工艺研究院;
【基金】：国家重大专项课题“致密油气开发环境保护技术集成及关键装备”(2016ZX05040005)
【分类号】：TE254
【正文快照】： 张敬辉.微乳液提高井壁稳定性实验研究[J].钻井液与完井液,2017,34(1):23-27.ZHANG Jinghui.Study on enhancing borehole wall stability by micro emulsion[J].Drilling FluidCompletion Fluid,2017,34(1):23-27.泥页岩尤其硬脆性泥页岩中存在大量发育的微裂缝,井眼形成后

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