基于小型测压分析的体积改造压裂设计

Massive Fracturing Design Based on Mini-frac Analysis

裂缝扩展模型的选择对于压裂设计和施工至关重要。基于小型测压分析,在确定储层、井筒等参数的基础上,综合测井解释、岩石力学等,分别建立并校正了离散裂缝网络模型和多缝模型。通过净压力拟合反演不同模型下的裂缝参数,并与微地震数据对比。结果显示:玛湖区块由于其岩石、应力、天然裂缝等条件的限制,体积改造并未形成裂缝网络,离散裂缝网络模型也不适用其体积改造的模拟,传统双翼对称裂缝对该区块裂缝描述更为准确;因此现场实际操作中应根据区块具体分析,不应盲从和盲目选择模型。

The choose of fracture propagation model is of importance in the fracturing design and construction. Based on mini-frac analysis, reservoir and wellbore parameters were obtained. A discrete fracture network model and multi-fracture model were built through the integration of well logging, rock mechanics and stress. After that, fracture morphology were obtained via net pressure matching, and was contrasted with microseismic detection data. The results have indicated that fracture network didn＇ t formed via massive fracturing in Mahu Block because of its rock mechanism, stress and natural fractures. Discrete fracture network model is no suitable for its fracture model- ing while tradition bee-wing model is more accurate. This may be a reminder for the extensive use of discrete fracture network model.