高密度白油基钻井液研究

发布时间：2018-07-23 13:01

【摘要】：近年来,随着石油能源需求量的增加,人们逐渐将开采重点由浅层转移到深层,由陆地转移到海洋,与此同时深井、超深井技术的发展给地层深处油藏的开采提供了技术支持。井深的增加带来了一系列问题,包括高温、高压、井壁坍塌等。为了更好地解决这些问题,高密度油基钻井液的研究和应用就显得尤为重要。加重材料的研究是高密度油基钻井液中重要的一环,对加重材料表面进行改性,使其由亲水疏油转变为亲油疏水,有利于在油基钻井液中更好的分散。本文采用采用十二烷基苯磺酸钠和十二烷基三甲基溴化铵对天然重晶石进行复合改性,通过设计正交试验,研究了各因素对改性效果的影响,确定了最佳改性条件,研制出复合改性重晶石。粒度级配实验证明,采用单一目数中重晶石对钻井液进行加重无法达到最优效果;将多不同目数重晶石进行合理的粒度级配可以有效的改善钻井液的流变性和滤失性。在Alfred方程计算的基础上通过对不同目数重晶石配比组合的筛选,确定了最佳粒度级配方案。在确定加重材料粒度级配方案的基础上,通过对处理剂的类型和加量优选实验,确定出一套密度2.2/cm~3以上的高密度白油基钻井液配方:5#白油+4%乳化剂JHMUL-2+2%CaO+2%有机土FBGEL-1+2.5%降滤失剂(HIFLO+HIROL)+重晶石+CaCl_2溶液(wt20%)+3%封堵剂(滑石粉),油水比为8:2。评价结果表明,该体系具有良好的流变性能、滤失性能、抗水污染性能、抗劣土污染性能、沉降稳定性能、润滑性能、抑制性能和抗温性能。
[Abstract]:In recent years, with the increasing demand for petroleum energy, the emphasis of exploitation has been gradually shifted from shallow layer to deep layer, and from land to sea. At the same time, the development of deep well and ultra-deep well technology has provided technical support for the exploitation of deep formation reservoir. The increase of well depth brings a series of problems, including high temperature, high pressure, wall collapse and so on. In order to solve these problems better, the research and application of high density oil-based drilling fluid is very important. The study of weighting materials is an important part of high-density oil-based drilling fluid. The surface modification of the weighting materials is beneficial to the better dispersion of oil-based drilling fluids by changing them from hydrophilic oil to hydrophilic hydrophobic. The natural barite was modified by sodium dodecyl benzene sulfonate and dodecyl trimethyl ammonium bromide. The influence of various factors on the modification effect was studied by orthogonal experiment, and the optimum modification conditions were determined. The compound modified barite was developed. The granularity gradation experiment shows that the optimum effect can not be achieved by adding barite to drilling fluid, and the rheology and filtration of drilling fluid can be improved effectively by reasonable granularity gradation of different barite. Based on the calculation of Alfred equation, the optimal granularity gradation scheme was determined by the screening of different mesh barite ratio combinations. On the basis of determining the grain-size gradation scheme of aggravation material, the experiment of optimal selection of the type and dosage of the treatment agent is carried out. A set of high-density white oil-based drilling fluid with density above 2.2/cm~3 was determined. The proportion of white oil 4% emulsifier JHMUL-2 2O 2% organic soil FBGEL-1 2.5% filtrate reducer (HIFLO HIROL) barite CaCl_2 solution (WT20%) 3% plugging agent (talc powder) was determined. The ratio of oil to water was 82: 2. The evaluation results show that the system has good rheological properties, filtration performance, water pollution resistance, poor soil pollution resistance, settling stability, lubricity, inhibition and temperature resistance.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE254

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