摘要
为了研究页岩气储层压裂改造中支撑剂的沉降规律，研制了多裂缝支撑剂铺置模拟设备，开展了不同裂缝结构、排量以及黏度下的实验。实验结果表明：随着压裂液黏度增加，主干裂缝中砂堤堆积高度减小，砂堤长度增加，砂堤表面变平缓，次级裂缝砂堤堆积高度变小；当排量增加时，主干缝砂堤坡度在裂缝入口端变平缓，在裂缝末端坡度增加，次级裂缝高度减小；对比不同裂缝结构，多裂缝结构的主干缝在节点处砂堤会出现突变，节点处砂堤高度忽然降低，形成“凹点”；次级裂缝数量越多，主干缝砂堤长度越小，“一”形多裂缝为0.55 m，而“ T”形多裂缝和“十”形多裂缝的主干缝砂堤长度分别为0.50，0.42 m，减小了9.09%，23.64%。实验研究结果丰富了支撑剂沉降理论。
Abstract
In order to study the rule of proppant placement in shale gas reservoir fracturing, a multi-fracture proppant placement simulation equipment was designed and manufactured. Experiments were carried out under different fracture structures, displacement and viscosity. The experimental results show that: with the increase of the viscosity, the height of the sand bank in the main fracture decreases, the length of the sand bank increases, the surface of the sand bank becomes gentle, and the height of the sand bank in the secondary fracture decreases; when the displacement increases, the slope of the sand bank of the main fracture becomes gentle at the entrance of the fracture, and increases at the end of the fracture, and the height of the secondary fracture decreases; compared with different fracture structures, the main fracture of multi fracture structure will have sudden change at the node, and the height of sand bank at the node will suddenly reduce, forming a "concave point"; the more the secondary fractures are, the smaller the sand bank length of the main fracture is. The sand bank lengths in the main fracture of the "一" type fracture, the "T" type fracture and the "十" type fracture are 0.55m, 0.50 m and 0.42 m respectively, the lengths of the "T" type fracture and the "十" type fracture are 9.09% and 23.64% less than that of the "一" type fracture respectively. The experimental results enrich the theory of proppant settlement.
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