气测录井资料在泌阳凹陷稠油区钻井中的导向及评价作用

Guidance & evaluation function of gas logging data in Miyang sag viscous crude well drilling

针对泌阳凹陷稠油区油层埋藏浅、成岩性差、地层相变严重、非均质性强的特点,在分析该区稠油形成原因和气测异常特征的基础上,认为在该稠油区钻大斜度井及水平井时,应用气测录井进行地质导向具有反应速度快、抗污染能力强、可有效恢复岩性剖面的优势。根据该稠油区气测录井的全烃和甲烷特征,结合钻时及相关录井资料,以XD1井大斜度定向井为例,阐述了适用于该稠油区的气测录井的地质导向和油层解释方法。实际应用情况表明,气测录井结合钻时进行该稠油区钻井过程中的地质导向,比使用LWD等先进装备具有开发成本低、技术上简便可靠的特点,且效果较好。

According to the features of shallow buried depth, the poor diagnetic rock, the serious facies change and great heterogeneity for the oil layers in Miyang sag heavy oil zone, and on the basis of analyzing heavy oil forming reasons and gas logging abnormal features, the authors thought that in the heavy oil zones of Miyang sag, using gas logging to make geologic guidance for high-angle well and horizontal well drilling has the features of rapid reaction speed, strong anti pollution ability, which could resume lithology profiles efficiently. According to the total hydrocarbon and methane features of gas logging in heavy oil zone of Miyang sag, combining with drilling time and the related mud logging data, taking well XD 1 of a high-angle directional well as an example, the paper set forth the geologic guidance and oil layer interpretation methods for gas logging in the heavy oil zones. The real applied results indicated that during drilling in such heavy oil zones, gas logging combined with drilling time to make geologic guidance, has the features of lower development cost, and being simpler, more convenient and reliable in technology than LWD, and the effect is good.