玛湖凹陷乌尔禾组砾岩储集层裂缝支撑剂运移规律

玛湖凹陷乌尔禾组致密砾岩油藏水力压裂裂缝形态复杂,支撑剂运移铺置规律尚不清楚,影响了储集层压裂效果。通过对不同形态迂曲裂缝进行重构,利用Fluent中的两相流模型,在考虑支撑剂与粗糙缝面相互作用的基础上,分析了砾石粒径、砾石数量以及砾石处缝宽衰减等对支撑剂运移铺置的影响。研究结果表明,砾石粒径对支撑剂运移的影响较为明显,砂堤平衡高度与砾石粒径呈负相关,平衡时间与砾石粒径呈正相关;砾石数量对支撑剂运移的影响较小,砂堤平衡时间和平衡高度与砾石数量呈负相关;砾石处缝宽衰减对支撑剂运移的影响很大,随砾石处缝宽衰减程度增大,砂堤平衡高度和平衡时间均减小。

Proppant Migration Law in Fractures of Conglomerate Reservoirs of Wuerhe Formation in Mahu Sag

Fractures induced by volume fracturing stimulation to tight conglomerate reservoirs of the Wuerhe formation in Mahu sag are very complex, so that the migration and distribution laws of proppants are not clear, which seriously influences the fracturing effect. Based on 3D reconstruction of fracture shapes and considering the interaction between proppants and rough fracture surface, the influences of gravel size, gravel concentration and width attenuation of the fractures around gravels on proppant migration and distribution were investigated by using a Fluent two-phase flowing model. The results show that gravel size has obvious impacts on proppant migration, and it is negatively correlated to balanced height of proppant bank and positively correlated to balanced time of proppant bank; gravel concentration has weak impacts on proppant migration, and it is negatively correlated to balanced time and balanced height of proppant bank; width attenuation of the fractures around gravels has great influences on proppant migration, and both balanced time and balanced height of proppant bank decrease with the increase of the fracture width attenuation degree around gravels.