伊朗Y油田稠油沥青污染严重影响钻井施工安全,多口井报废。稠油沥青可流动性越好,复杂情况处理难度越大。为降低复杂情况的处理难度,遂借鉴稠油、沥青的老化、氧化、固化等反应机理,稠化稠油沥青,使之在地层孔道中可流动性降低。优选氧化材料进行稠化试验,探讨了试验温度、时间、物料配比、氧气、钻井液对稠化性能的影响。结果显示,氧化材料可有效提高稠油沥青软化点,最高可达120℃。稠化剂F、G、H的稠化效果与试验温度、反应时间成正比例关系,且G的稠化效果受添加量影响较大。在氮气保护时或钻井液体系中,稠化剂的稠化效果降低。氧化材料与堵漏材料复配使用效果更好,可增加桥堵材料滞留和堵漏段塞抗返吐能力,提高压井堵漏成功率。
Bitumen contamination of Y oilfield in Iran had seriously negative effect on drilling safety and caused abandonment of several wells. In reference to aging, oxidation and solidify mechanism of heavy oil and bitumen, oxidizing material was selected optimally for bodying bitumen. The influence of testing temperature, time, and ratio of material, oxygen and drilling fluids were explored. The results showed that oxidation materials can effectively increase bitumen softening point, and bitumen was bodying under simulated formation temperature. The site test showed it is better if oxidation materials and lost circulation materials were used together. The mobility of bodying bitumen in the formation pore decreased, the sealing success rate got improved dramatically and the intrusion rate could be effectively controlled when the mud pump stopped. The difficulty of situations of complexity processing was reduced.
