考虑温度时碳酸盐岩地层破裂压力的确定

地层破裂压力（梯度）是确定地层压力检测的一个重要组成部分，对钻井、完井和压裂等施工都相当重要。塔河油田碳酸盐岩油藏为岩溶-缝洞型的特殊性油藏，储层非均质性较强，储渗空间形态各异，大小悬殊，分布不均，油气储集空间多为裂缝-孔洞型，压裂作业时，储层易受伤害。对于碳酸盐岩储层，裂缝越发育，地层破裂压力越低。在前人研究成果的基础上，综合分析了上覆岩层压力、孔隙压力、井壁应力集中、构造应力、岩石抗拉强度和温度对碳酸盐岩地层破裂压力的影响，得到了新型破裂压力模式。分析结果表明，温度对地层破裂压力的影响不容忽略。

Determination of Carbonate Formation Fracture Pressure Considering Formation Temperature

One of the important parts of formation pressure detection is to determine formation fracture pressure, which is important for drilling, well completion and fracturing. Carbonate reservoirs in Tahe Oilfield are fractured/caverned special reservoirs, with heterogeneity in pay zones and different types of reservoir and flow space. The pore volumes are mainly fractured/caverned, and the reservoir is easier to be damaged when fractured. For carbonate reservoirs, more developed fractures, the lower the formation fracture pressure the reservoir has. Based on the results of previous work, this paper analyzed the impacts of overburden pressure, pore pressure, borehole stress concentration, tectonic stress, rock tensile strength and formation temperature on fracturing pressure of carbonate reservoirs. A new model for fracturing pressure was obtained. The analysis results indicate that the impact of formation temperature on fracturing pressure can not be ignored.