全三维水力压裂过程中裂缝及近缝地层的温度计算模型

A MODEL FOR CALCULATING TEMPERATURE IN THE FORMATION FRACTURES AND ADJACENT AREA DURING FULL 3-D HYDRAULIC FRACTURING

根据全三维水力压裂模型 ,建立了水力压裂施工过程中裂缝、盖层、底层以及裂缝附近地层中三维温度分布的数学模型。在该模型中 ,考虑了裂缝内的液体沿缝长和缝高方向作二维流动及裂缝向上、向下延伸到盖层和底层中的情况。计算实例表明 ,液体沿裂缝长度和高度方向同时流动时 ,在其长度和高度方向上都存在温度梯度。并且在沿裂缝高度方向上 ,由于滤失带对地层传热的影响 ,使得油层范围内的温度变化较小 ;而在油层范围以外 。

Based on the full 3-D hydraulic fracturing model, a model of 3-D temperature distribution in fracture and adjacent area during fracturing is established. In this model, the fluid flow inside fracture is assumed to be a 2D flow in the horizontal and vertical directions, and the temperature is distributed with 3-D type, which is accordance with the real reservoir condition. Meanwhile, the temperature distribution in overlying and the bottom layers is analyzed when the fracture propagates into the overlying or under layers. The result indicates that there is a smaller temperature gradient within payzone than within overlying and the bottom layers.