Rheological and Filtration Loss Characteristics of Colloidal Gas Aphron Based Drilling Fluids
Rheological and Filtration Loss Characteristics of Colloidal Gas Aphron Based Drilling Fluids
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DOI：
10.1627/jpi.55.182
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发表时间：
2012-05-01
影响因子：
1
通讯作者：
Zamani, Majid
中科院分区：
文献类型：
--
作者：
Nareh'ei, Milad Arabloo;Shahri, Mojtaba Pordel;Zamani, Majid
胶体气体泡沫 (CGA) 流体由直径为 10 至 100 μm 的气泡组成，周围环绕着薄薄的水性表面活性剂薄膜。这种液体结合了某些表面活性剂和聚合物来形成微泡系统。 CGA中表面活性剂的作用是产生表面张力以容纳泡沫。在配方中还需要考虑生物聚合物作为增粘剂和稳定剂。这种充满泡沫的流体似乎特别适合在贫化区钻探。泡沫基流体的独特特征是在孔隙网络或裂缝中形成无固体、坚韧和弹性的内桥，以最大限度地减少空气微泡的深层侵入。当生产开始时，这种微环境密封很容易通过储层回流进行清理，从而降低与增产过程相关的成本。本文对含有不同浓度聚合物和表面活性剂的 CGA 钻井液的流变行为和过滤性能进行了全面的比较研究。实验室评价表明，CGA基流体是钻井作业中控制滤失或循环漏失、节约成本、提高生产率的理想工程材料之一，其流变特性和过滤性能受聚合物和表面活性剂浓度水平的影响很大。
Colloidal gas aphron (CGA) fluids, consist of gas bubbles with diameters ranging from 10 to 100 mu m, surrounded by a thin aqueous surfactant film. This fluid combines certain surfactants and polymers to create the systems of microbubbles. The function of surfactant in CGA is to produce the surface tension to contain the aphrons. Also a biopolymer needs to be considered in the formulation as a viscosifier as well as stabilizer. The aphron-laden fluid appears to be particularly well suited for drilling through depleted zones. The unique feature of aphron based fluids is to form a solid free, tough, and elastic internal bridge in pore networks or fractures to minimize deep invasion by means of air microbubbles. This microenvironment seal readily cleans up with reservoir flow back as production is initiated, thereby reducing cost associated with stimulation processes. This paper presents a comprehensive, comparative study of rheological behavior and filtration properties of CGA based drilling fluids with various concentrations of polymer and surfactant. Laboratory evaluations showed that the CGA based fluid is one of the ideal engineering materials which can control fluid loss or loss circulation during drilling operation, save cost and increase productivity which rheological characteristics and filtration properties of them are greatly influenced by the level of polymer and surfactant concentration.