Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding

Abstract

The invention discloses a multi-cluster perforation fracturing method with a variable perforation size and variable perforation density and uniform liquid feeding and sand feeding. The multi-cluster perforation fracturing method is characterized in that the displacement of each cluster perforation is equal, and is equal to the total injection displacement divided by the number of clusters of perforations in segments. The multi-cluster perforation fracturing method comprises the steps that (1) key reservoir parameters are evaluated; (2) segment cluster locations are determined; (3) crack parameters are optimized; (4) fracturing construction parameters are optimized; (5) adjacent well segment cluster is subjected to liquid feeding and proppant feeding monitoring parameter analysis; (6) average displacement of each cluster of perforations is subjected to distribution; (7) pressure of the wellbore at each cluster of perforations of a horizontal wellbore is calculated; (8) adjustment of thenumber of perforations and aperture of each cluster perforations are performed; (9) fine adjustment of overall cluster perforation scheme in the segments is performed; (10) a bridge plug is lowered and the cluster perforations are subjected to joint operation; (11) acid pretreatment and prepad liquid width generating and sand-carrying fluid sand feeding are performed; and (12) replacement operation is performed. The multi-cluster perforation fracturing method increases the uniformity of liquid feeding and sand feeding between the perforation clusters, improves the distribution of the fracturing fluid and the proppant between the perforation clusters, increases the overall transformation volume of the cracks, and maximizes the reservoir yield-increasing effect.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing, and furthermore, relates to a multi-cluster perforation fracturing method with variable pore diameter, variable pore density and uniform liquid and sand injection. The invention can be used in staged fracturing of horizontal wells in carbonate rock, sandstone, shale and other reservoirs. Background technique [0002] At present, in staged fracturing of horizontal wells, bridge plug perforation combined technology is widely used. The multi-cluster perforation technology used generally adopts the perforation strategy of equal aperture and equal density. This is based on the perforation strategy of each cluster. It is assumed that the fracturing fluid and proppant are uniformly fed into each cluster, but the actual situation is that due to the heterogeneity of the fracturing target layer, it is difficult to ensure that each cluster is uniformly fed with fluid and sand. A large nu...

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Problems solved by technology

[0004] In the past, the perforation technology with variable pore diameter and variable pore density was also proposed, but it lacked quantitative design methods as a basis, and it was often based on experience.

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