适用于页岩气钻井的油基泡沫钻井液的研制

发布时间：2018-07-10 02:42

  本文选题：油基泡沫 + 发泡剂　； 参考：《西南石油大学》2016年硕士论文

【摘要】：本论文主要是针对页岩气钻井时页岩水敏性强,钻井液漏失量大的问题,研制出了一种油基泡沫钻井液。通过室内实验,合成出了一种油基发泡剂,并筛选出与之复配效果最佳的发泡剂,研制出了油基发泡剂配方；优选油基稳泡剂,研制出了油基稳泡剂配方,最终配制出了一种油基泡沫钻井液,并在不同条件下评价其性能,用电子显微镜观察油基泡沫的微观形态变化。具体研究内容和取得的成果如下：(1)合成出了油基发泡剂BMG,优化了反应条件,评价了泡沫性能。其中,主要反应物为：硬脂酸甲酯(C19H38O2)、N-苄基乙醇胺(CgH13NO)、缩水甘油(C3H6O2);最佳反应条件为：反应温度1为140℃,反应温度2为45℃,反应时间1为6h,反应时间2为3h,催化剂KOH质量浓度为0.8%,最佳反应物摩尔比为：硬脂酸甲酯：N-苄基乙醇胺：缩水甘油=1.0：1.2：3.0；常温下,质量浓度为0.6%BMG在柴油中的发泡高度为200mL,半衰期为77s：在120℃时,发泡高度为190mL,半衰期为56s,可将柴油最初表面张力27.0mN/m降低到17.5mN/m0(2)通过筛选与复配油基发泡剂,研制出了最佳油基发泡剂配方BFG。其最佳配比为BMG:GMO3:1(质量浓度比)。常温下,质量浓度为0.6%BFG泡沫高度最高达到260mL,半衰期在105s左右,泡沫综合值达到20475mL.s,可将柴油的表面张力从27.0mN/m降低至16.0mN/m。(3)制备出了油基稳泡剂HXG,其配方为：有机土：黄原胶=1：3(质量浓度比),最佳质量浓度为2.0%,加入该稳泡剂后,发泡高度最高达为275mL,半衰期达245s,泡沫综合值达50531mL-s。(4)确定了最佳油基泡沫钻井液配方：柴油+0.6%BFG+2.0%HXG。该油基泡沫钻井液抗温能力在120℃～140℃；页岩的滚动回收率为96.66%；抗岩屑能力达到15%左右,加入15%岩屑后,最大发泡高度为210mL,半衰期为200s；抗原油污染能力可达到15%；抗盐能力大于14000mg/L;抗水侵能力大于20%。(5)不同条件下,油基泡沫微观形态变化明显。未添加其他物质时,油基泡沫大小差异较大,大泡沫居多,泡沫形状不规则；加入岩屑后,小泡沫变多,大泡沫的液膜周围存在较多小泡沫,液膜中间也存在微小泡沫,岩屑大多残留在液膜里面；加入原油后,原油与油基液充分混合,产生的泡沫基本呈现圆形,大泡沫较少,以小泡沫为主,并且泡沫液膜光滑；加入NaCl后,油基泡沫形状基本为圆形,并且生成的大泡沫液膜上及泡沫之间的液相中产生了许多小气泡；加入水后,油基大泡沫形状不规则,小泡沫基本为圆形,微小泡沫增多。
[Abstract]:In this paper, an oil-based foam drilling fluid was developed to solve the problems of high water sensitivity and large leakage of drilling fluid in shale gas drilling. Through laboratory experiments, an oil-based foaming agent was synthesized, and the foaming agent with the best combination effect was screened out, the oil-based foaming agent formula was developed, the oil-based foaming agent was selected and the oil-based foaming stabilizer formula was developed. Finally, an oil-based foam drilling fluid was prepared, and its performance was evaluated under different conditions. The microscopic morphology of oil-based foam was observed by electron microscope. The main contents and achievements are as follows: (1) the oil based foaming agent BMGwas synthesized, the reaction conditions were optimized, and the foam properties were evaluated. The main reactants are methyl stearate (C19H38O2) N-benzyl ethanolamine (CgH13NO), glycidyl (C3H6O2), and the optimum reaction conditions are as follows: reaction temperature 1 is 140 鈩，

本文编号：2111717