Welan gum (WLG) has been reported being used in chemical flooding and hydraulic fracturing for high-temperature and high-salinity reservoir development due to its good temperature resistance and salt tolerance properties. The adsorption and retention of WLG in reservoir rocks will reduce the reservoir permeability and affect the economic development of oil and gas fields. However, there are no reports about the adsorption of WLG on quartz sand. Therefore, in this study, standard curve of absorbance-WLG concentration was established by anthrone colorimetry method. The adsorption behavior accorded with the Langmuir adsorption isotherm. The adsorption capacity was 4.01 mg/g. By means of Fourier transform infrared spectrum analysis, X-ray diffraction technology, thermogravimetric analysis, scanning electron microscope, optical microscope, and contact angle measurement, it is confirmed that the adsorption was physical adsorption and surface adsorption, and did not have obvious influence on crystal spacing and wettability of quartz sand. Based on this, the study of the influence of reservoir conditions showed that: the adsorption capacity decreased with the increase of temperature; pH value had little effect; the adsorption capacity first increased and then decreased with the increase of inorganic salt content, and this trend varied with the types of inorganic salts.

据报道，Welan胶（WLG）具有良好的耐温性和耐盐性，因此被用于化学驱和水力压裂，以开发高温和高盐度的油藏。WLG在储层岩石中的吸附和保留将降低储层渗透率，影响油气田的经济发展。但是，没有关于WLG在石英砂上的吸附的报道。因此，在这项研究中，通过蒽酮比色法建立了吸光度-WLG浓度的标准曲线。吸附行为符合Langmuir吸附等温线。吸附容量为4.01mg / g。通过傅立叶变换红外光谱分析，X射线衍射技术，热重分析，扫描电子显微镜，光学显微镜，并通过接触角测量，证实了吸附是物理吸附和表面吸附，对石英砂的晶体间距和润湿性没有明显的影响。在此基础上，对储层条件的影响研究表明：吸附量随温度的升高而降低；吸附量随温度的升高而降低。pH值影响不大；吸附量随无机盐含量的增加先增大后减小，且随无机盐类型的变化而变化。吸附量随温度的升高而降低。pH值影响不大；吸附量随无机盐含量的增加先增大后减小，且随无机盐类型的变化而变化。吸附量随温度的升高而降低。pH值影响不大；吸附量随无机盐含量的增加先增大后减小，且随无机盐类型的变化而变化。