修正机械比能模型的研究

Research on Modification of Mechanical Specific Energy Model

提高机械比能模型的适用性,可以大大降低钻探周期。通过力学分析在R.Teale提出的机械比能模型基础上进行修正,分别对直井、斜井的钻压及扭矩进行修正,获得功交汇模型。研究表明,相同深度下垂向功恒大于切向功,当垂向功与切向功交汇时,"放空"现象体现该层的地质物性良好;利用功交汇模型可以较好的反映井底的工况,机械比能更加适合录井的物性评价,规避了非客观因素对机械比能比值模型基准线的影响,增强了现场物理性质评价的准确性。

In order to reduce the drilling cycle, it is necessary to improve the applicability of the mechanical specific energy model. In this paper, the mechanics analysis is based on the mechanical energy model proposed by R. Teale, the drilling pressure and torques of the vertical and inclined wells are modified respectively, and the intersection model is obtained. The results show that the vertical power is constant greater than that of tangential power at the same depth. When tthe vertical work is tangled with tangential work, the phenomenon of ＂venting＂ reflects the good geological properties of the layer. The merit model can better reflect the bottom, and the mechanical ratio can be more suitable for the evaluation of the physical properties of logging, avoiding the influence of non-objective factors on the baseline of the mechanical specific energy ratio model, and enhancing the accuracy of field physical property evaluation.