Colloidal gas aphrons (CGA) drilling fluid has been worldwide used in drilling depleted reservoirs and other under-pressured zones for its special plugging mechanism and excellent ability of lost circulation control. However, the research temperature of CGA system reported in the previous literatures is within 140 °C, and it is still an urgent challenge to promote its application in high-temperature (≥150 °C) deep wells. In this study, a novel environmentally-friendly xanthan gum derivatives XG-AA/AM/AMPS was synthesized by grafting acrylic acid (AA), acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS) onto XG and CGA drilling fluids with a temperature resistance of 180 °C has been successfully generated by using XG-AA/AM/AMPS as a foam stabilizer. Results presented that the XG-AA/AM/AMPS-based CGA drilling fluids can maintain reasonable rheology properties within 180 °C, i.e., significant shear thinning behavior, higher low shear rate viscosity, and apparent viscosity, and reasonable rheological parameters, which was conducive to cuttings carrying. At 140–180 °C, the filtration volume of prepared CGA fluid can be controlled within 13.5 mL. Furthermore, the high-temperature resistance mechanism of XG-AA/AM/AMPS was studied by several techniques (PSD, XRD, SEM, and polarizing microscope), which can be attributed to the dual effects of XG-AA/AM/AMPS on enhancing the dispersion of clay particles and the stability of aphrons.

胶体气瓶（CGA）钻井液因其特殊的堵漏机制和出色的失水控制能力，已在全球范围内广泛用于枯竭的油藏和其他低压区域的钻井。然而，先前文献报道的CGA系统的研究温度在140°C以内，如何在高温（≥150°C）的深井中推广其应用仍然是迫在眉睫的挑战。在这项研究中，通过将丙烯酸（AA），丙烯酰胺（AM），2-丙烯酰胺基-2-甲基丙烷磺酸（AMPS）接枝到XG和CGA上，合成了一种新型的环保型黄原胶衍生物XG-AA / AM / AMPS通过使用XG-AA / AM / AMPS作为泡沫稳定剂，已成功产生了耐高温180°C的钻井液。结果表明，基于XG-AA / AM / AMPS的CGA钻井液可以在180°C范围内保持合理的流变性，即显着的剪切稀化行为，较高的低剪切速率粘度和表观粘度以及合理的流变性。有利于cutting插携带。在140–180°C下，制备的CGA流体的过滤体积可以控制在13.5 mL之内。此外，通过几种技术（PSD，XRD，SEM和偏光显微镜）研究了XG-AA / AM / AMPS的耐高温机理，这可以归因于XG-AA / AM / AMPS对XG-AA / AM / AMPS的双重作用。增强粘土颗粒的分散性和菲龙的稳定性。合理的流变参数，有利于切屑的携带。在140–180°C下，制备的CGA流体的过滤体积可以控制在13.5 mL之内。此外，通过几种技术（PSD，XRD，SEM和偏光显微镜）研究了XG-AA / AM / AMPS的耐高温机理，这可以归因于XG-AA / AM / AMPS对XG-AA / AM / AMPS的双重作用。增强粘土颗粒的分散性和菲龙的稳定性。合理的流变参数，有利于切屑的携带。在140–180°C下，制备的CGA流体的过滤体积可以控制在13.5 mL之内。此外，通过几种技术（PSD，XRD，SEM和偏光显微镜）研究了XG-AA / AM / AMPS的耐高温机理，这可以归因于XG-AA / AM / AMPS对XG-AA / AM / AMPS的双重作用。增强粘土颗粒的分散性和菲龙的稳定性。