Supporting agent conveying complicated crack experimental device with flow field whole domain measurable

Abstract

The invention relates to a supporting agent conveying complicated crack experimental device with the flow field whole domain measurable. The device is composed of a fracturing fluid configuration tank1, a conveying pump 3, a simulated shaft 4, a visual complex slab crack, a liquid outflow pipe 11, a waste liquid treatment tank 17, a CCD camera 9, and a PIV laser instrument 10; after a mixture ofthe configuration tank enters from the top end of the simulated shaft through a discharging port and the conveying pump, the mixture flows into the slab crack; the slab crack is formed by splicing a single-crack module and a branch-crack module; the single-crack module is composed of a single-crack channel variable in crack width; the branch-crack module is composed of crack channels in two different crack widths of a main crack-first stage secondary crack and a first stage secondary crack-second stage secondary crack; the outlet position of each stage crack is connected with the liquid outflow pipe; fluid flowing out of the slab crack flows into the waste liquid treatment tank after entering the liquid outflow pipe; and the device performs testing and recording on the flow field speed ofthe slab crack through the CCD camera and the PIV laser instrument. The supporting agent conveying complicated crack experimental device with the flow field whole domain measurable can provide a theoretical basis for hydraulic fracturing construction parameter optimization and supporting agent preference.

Description

technical field [0001] The invention relates to an experimental device for proppant transporting complex fractures that can be measured in the whole flow field, and belongs to the technical field of oil and gas field development and experimental fluid mechanics research. Background technique [0002] As an unconventional natural gas resource, shale gas has abundant reserves in my country and has broad exploration prospects. Hydraulic fracturing technology is the core technology of shale gas exploitation, and it is an important means of stimulation and transformation of shale gas reservoirs. Shale fracturing mainly uses low-viscosity slick water to pump high displacement into the formation to realize the communication between bedding and natural fractures in shale reservoirs, thus forming multi-level complex fractures. In order to form an effective support when the fracture is closed, the proppant that enters the fracture channel with the fracturing fluid needs to have bette...

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Problems solved by technology

[0004] Chinese patent application CN107816342A discloses a visual experiment device for proppant migration in fractures, which is sandwiched by two transparent plates to form a long fracture channel, which can only observe and record the migration law of proppant in it

Chinese patent application CN104792491A discloses a device for simulating multi-angle fracture network proppant settlement law, which includes main fractures and secondary fracture structures, fully reflects the shape of natural fractures, but can only qualitatively observe the migration and accumulation of proppant

Chinese patent application CN109779593A discloses a visual flat plate fracture device that can realize three-dimensional flow field testing in a single fracture channel. Combined with the flow field testing tool, it can only realize the fracturing fluid and support in the long single fracture channel in the conventional oil and gas field fracturing process. Velocity Field Measurement of Agent Particles

However, the shale complex fracture channels include two types of flow field characteristics in single fractures and branch fracture joints. The flow field measurement at branch fracture joints is more difficult, which is very important for studying the movement of fluid and particles in the entire complex shale fractures The law is also more important, and the current relevant patents have failed to achieve this function

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