红外光气测录井技术应用研究

The application and research of infrared light gas logging technology

为了探索石油钻井过程中利用红外光气体检测技术实现烃类气体检测的可行性,依据红外光吸收技术原理,进行了利用红外光气体检测技术对不同体积分数的甲烷、乙烷、丙烷、异丁烷、正丁烷和混合烃气检测分析实验。实验结果表明,注样气体体积分数与检测值之间的相关系数均超过了0.95,最高接近1。从现场应用角度,列举了两口井应用红外光和色谱气体检测技术异常显示井段的全烃曲线,结果表明两曲线特征基本相同,而且特征明显,可满足现场气体录井要求。由于各烃组分红外光谱吸收波长比较接近,难于区分烃组分,该方法用于烃组分的检测尚需进行深入研究与实验。

In order to probe the realization feasibility of detecting hydrocarbon gases by using infrared light gas detecting technology during petroleum drilling, the detecting and analyzing experiment was performed on methane, ethane, propane, isobutane, normal butane and mixed hydrocarbon gases percentages of different volume by using infrared light gas detecting technology. It was indicated by the experimental results that all correlated coefficients between injected gas volume percentages and the detecting values exceeded 0.95, and the highest coefficient was near 1. The paper cited the total hydrocarbon curves of abnormal showing intervals for two wells, in which the infrared light and chromatographic gas detecting technology was used from the aspect of wellsite application. The results showed that the features of the two curves are basically same and obvious, which could meet the demands of wellsite gas logging. As the infrared light absorbing wavelengths of each hydrocarbon component are close to and difficult to distinguish, the method is required to be studied and tested deeply if it is used for detecting hydrocarbon component.