本文關(guān)鍵詞： 頁巖氣 容量法 重量法 等溫吸附 過剩吸附量　出處：《化工進展》2017年05期 　論文類型：期刊論文

【摘要】：頁巖吸附氣含量是準(zhǔn)確評價頁巖含氣量和資源潛力的關(guān)鍵參數(shù),目前通常采用等溫吸附實驗來確定。等溫吸附實驗方法主要分為容量法和重量法,容量法是目前常用的等溫吸附實驗方法,重量法的應(yīng)用還較少。本文通過分析兩種方法的實驗原理,認為容量法和重量法等溫吸附實驗測得的吸附量均為過剩吸附量,絕對吸附量并不能通過實驗直接測得,并建立了過剩吸附量與絕對吸附量的轉(zhuǎn)換關(guān)系。為了對比分析兩種實驗方法的準(zhǔn)確性和穩(wěn)定性,分別進行了相同樣品的容量法和重量法等溫吸附實驗。測試結(jié)果表明,低壓時甲烷在頁巖中的吸附曲線呈Ⅰ型的吸附曲線特征,但是當(dāng)壓力進一步增大后,等溫吸附曲線會出現(xiàn)下降。頁巖中超臨界甲烷的等溫吸附曲線在壓力較大時,必然存在下降的趨勢,這并非異常現(xiàn)象,而是超臨界流體過剩吸附量的本質(zhì)特征。對比分析認為,在傳感器精度和天平精度經(jīng)過校準(zhǔn)的情況下,重量法等溫吸附實驗對實驗參數(shù)和環(huán)境的敏感程度要低于容量法。特別是對于吸附量較低的泥頁巖,容量法測試中引起的誤差大于重量法。在現(xiàn)有技術(shù)水平條件下,認為重量法更適用于頁巖的等溫吸附實驗研究。
[Abstract]:Shale adsorption gas content is the key parameter to accurately evaluate shale gas content and resource potential. At present, isothermal adsorption experiments are usually used to determine the content of shale gas. The isothermal adsorption experiments are mainly divided into volumetric method and gravimetric method. Volumetric method is a commonly used isothermal adsorption experimental method, and the application of gravimetric method is relatively few. This paper analyzes the experimental principle of the two methods. It is considered that both the volumetric method and the gravimetric isotherm adsorption experiment are excess adsorption, and the absolute adsorption can not be measured directly by the experiment. In order to compare and analyze the accuracy and stability of the two experimental methods, the relationship between excess adsorption capacity and absolute adsorption capacity was established. The isothermal adsorption experiments of the same samples by volumetric method and gravimetric method were carried out. The results showed that the adsorption curve of methane in shale at low pressure showed the characteristics of type I adsorption curve, but when the pressure increased further. The isothermal adsorption curve of supercritical methane in shale will decrease when the pressure is high, which is not an abnormal phenomenon. It is the essential characteristic of supercritical fluid excess adsorption. The contrast analysis shows that the sensor precision and balance precision are calibrated. The sensitivity of gravimetric isothermal adsorption test to experimental parameters and environment is lower than that of volumetric method, especially for shale with low adsorption capacity. The error caused by volumetric method is greater than that by gravimetric method. It is considered that the gravimetric method is more suitable for the isothermal adsorption experiment of shale under the condition of prior technical level.
【作者單位】： 中國石油勘探開發(fā)研究院廊坊分院;中國石油天然氣集團公司非常規(guī)油氣重點實驗室;中國科學(xué)院力學(xué)研究所流固耦合系統(tǒng)力學(xué)重點實驗室;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃項目(2013CB2281)
【分類號】：TE37;O647.3
【正文快照】： decrease.There is an inevitable downward trend of the isothermal adsorption curve at high pressure,which is not an abnormal phenomenon,but is the essential characteristic of excess adsorption capacityof supercritical methane.Comparative analysis show tha，

本文編號：1465379