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前言随着钻井深度的增加,井底温度也随之增高,高温会引起各种泥浆性能的恶化。通常,在高温下,泥浆中的各种粘土粒子产生絮凝作用、凝胶化、粘度增大,更进一步由于泥浆材料的热降解等,泥浆的功能显著降低。此外,井愈深,钻屑的携带、清除将变得更加困难,这也是一个大问题,钻屑是通过泥浆从井底携带到地面,如果从井底到地面的距离较长的话,钻屑在携带出地面的过程中就水化,或者因钻杆旋转等机械撞击作用,钻屑粉碎变细,且进入泥浆中分散开来的机会增多,钻屑一旦成了细颗粒后分散到泥浆里,要想在地面上把它分离除去就非常困难,这样分散到泥浆中的钻屑周而复始地循环,进而微细粉化,随即这种带有胶体性质的细粒子将给予泥浆性能带来很不良的影响,这种倾向在深井高温下特别明显。
Preface With the increase of drilling depth, bottom hole temperature also increases, high temperature can cause deterioration of various mud properties. In general, various clay particles in the slurry are flocculated, gelatinized and increased in viscosity at high temperatures, and the function of the slurry is significantly reduced due to thermal degradation of the slurry material. In addition, the deeper the well, the more difficult it is to carry and remove the cuttings. This is also a big problem. Cuttings are carried from the bottom of the well to the ground through the mud. If the distance from the bottom of the well to the ground is longer, drill cuttings Drilling cuttings becomes thinner when they are carried out of the ground by hydration due to a mechanical impact such as drill pipe rotation or the like, and there is an increased chance of dispersion into the mud. Once the drill cuttings are finely dispersed, they are dispersed into the mud , It is very difficult to separate and remove it on the ground so that the drill cuttings dispersed in the mud circulate cyclically and then finely pulverize, and then the fine particles with the colloidal nature will give poor mud performance Affected, this tendency is particularly evident at deep well temperatures.