【摘要】：常規(guī)的砂巖酸化工藝需要多個段塞注入前置液、處理液、后置液等,給生產作業(yè)帶來了不便和困擾。為此,基于"一步"代"多步"的一體酸概念和高效、集約化的理念,研制了一種主要由有機多元酸(HA)+HCl+HF+高效有機溶劑構成的HA一體化酸液體系,可實現對砂巖儲層復雜堵塞的有效解堵。對其緩速性能、有機堵塞物溶解、螯合性能和抑制沉淀性能等的實驗評價結果表明:(1)新型HA一體化酸不僅可以達到常規(guī)一體化酸"一步"代替"多步"酸化的功效而且還具有良好的緩速性能,可通過控制H+的多級分步電離和在黏土礦物上形成硅酸—膦酸鋁膜達到緩速的目的 ;(2)對有機物堵塞物解除效率高;(3)HA一體化酸體系相比常規(guī)的APCS(氨基聚羧酸類)螯合劑具有更寬的p H值溶解范圍,對Ca~(2+)、Mg~(2+)、Fe~(3+)的螯合能力比常規(guī)螯合劑(EDTA、NTA、DTPA等)更強,抑制金屬氟化物、氟硅酸堿金屬和氟鋁酸堿金屬、氫氧化物沉淀比多氫酸、氟硼酸、土酸效果更優(yōu)異。該研究成果為高溫深層油氣藏的解堵提供了技術支撐。
[Abstract]:The conventional sandstone acidizing process requires multiple slugs to be injected into the pre-liquid, treatment liquid, post-liquid, etc., which brings inconvenience and trouble to the production operation. In this paper, based on the concept of "one-step" and "multi-step", a HA integrated acid system composed mainly of organic polybasic acid (HA) HCl HF) and high efficient organic solvent was developed. The effective plugging removal of sandstone reservoir can be realized. For its slow-speed performance, organic clogging dissolved, The results of chelating and precipitation inhibition experiments show that: (1) the new HA integrated acid can not only achieve the function of "one step" instead of "multi-step" acidification, but also have good retarding performance. By controlling the multistage ionization of H and the formation of aluminum silicate-phosphonate film on clay minerals, the aim of slow speed can be achieved. (2) the removal efficiency of organic blockage is high; (3) compared with the conventional APCS (amino polycarboxylic acid) chelators, the HA system has a wider range of pH values, and the chelating ability of Ca~ (2), Mg~ (2), Fe~ (3) is stronger than that of the conventional chelating agents (EDTA,NTA,DTPA, etc.) The effect of inhibiting metal fluoride, fluorosilicate alkali metal and fluoroaluminate base metal, hydroxide precipitation is better than polyhydrogen acid, fluoroboric acid and earth acid. The research results provide technical support for plugging removal in high temperature deep reservoirs.
【作者單位】： 西南石油大學"油氣藏地質及開發(fā)工程"國家重點實驗室;中海石油(中國)有限公司天津分公司;中國石油長慶油田公司第五采氣廠;
【基金】：國家科技重大專項“大型油氣田及煤層氣開發(fā)”(編號:2016ZX05058-003)
【分類號】：TE377

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