Experimental device and method for simulating horizontal well multi-cluster double-wing hydraulic fracture proppant conveying

Abstract

The invention discloses an experimental device and method for simulating horizontal well multi-cluster double-wing hydraulic fracture proppant conveying. The experimental device comprises a sand-carrying fluid preparation system, a multi-cluster double-wing hydraulic fracture system, a sand-carrying fluid recovery system and a monitoring system which are connected in sequence. The multi-cluster double-wing hydraulic fracture system comprises a horizontal shaft, N perforations are formed in the horizontal shaft, N is an even number larger than or equal to 4, at least two perforations are arranged on the same axis to form multiple clusters, two perforations are symmetrically arranged on the same radial direction to form double wings, and each perforation is connected with a fracture simulation model; an inlet of the horizontal shaft is connected with an outlet of the sand-carrying fluid preparation system, and an outlet of the horizontal shaft and an outlet of the crack simulation model are both connected with the sand-carrying fluid recovery system. The monitoring system comprises a flow meter, a pressure meter and a camera. According to the invention, the conveying condition of the multi-cluster double-wing hydraulic fracture proppant of the horizontal well can be simulated, and technical support is provided for staged fracturing of the horizontal well.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and gas reservoirs, in particular to an experimental device and method for transporting proppant in simulated horizontal well multi-cluster double-wing hydraulic fractures. Background technique [0002] At present, the focus of oil and gas production in my country has extended from conventional oil and gas reservoirs to unconventional oil and gas reservoirs such as low permeability oil and gas reservoirs, tight oil and gas reservoirs, and shale oil and gas reservoirs. important measure. In the staged fracturing process of horizontal wells, the mixture of fracturing fluid and proppant comes out of the pump group, passes through the surface piping system, the vertical pipe string and the horizontal pipe string in sequence, and then enters the fracture for migration, settlement and laying , its final laying pattern in the fracture determines the effect of fracturing and the final...

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Problems solved by technology

However, the existing experimental devices and researches on proppant transportation are mainly aimed at the main fractures or complex fractures formed by a single cluster in a single stage during the staged fracturing of horizontal wells, while in the actual fracturing process, multiple clusters of double-winged fractures develop simultaneously. There are many clusters of fractures with different characteristics (different fracture lengths, fracture heights, and fracture widths) and the flow distribution among different fractures and between different inlets of the same fracture. The existing experimental equipment cannot perform effective simulations.

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