Experimental investigation of the effects of heterogeneity and geostress difference on the 3D growth and distribution of hydrofracturing cracks in unconventional reservoir rocks

CDEM-based analysis of the 3D initiation and propagation of hydrofracturing cracks in heterogeneous glutenites

A multiscale comprehensive study on pore structure of tight sandstone reservoir realized by nuclear magnetic resonance, high pressure mercury injection and constant-rate mercury injection penetration test

Reservoir geomechanical modeling: In-situ stress, pore pressure, and mud design

Hydraulic fracture propagation direction during volume fracturing in unconventional reservoirs

Formation mechanism of the Upper Triassic Yanchang Formation tight sandstone reservoir in Ordos Basin—Take Chang 6 reservoir in Jiyuan oil field as an example

Induced Stress and Interaction of Fractures During Hydraulic Fracturing in Shale Formation

A parallel panel crack simulation device under the leak-off condition of a fracturing fluid comprises a crack formed by two parallel organic glass panels, a fracturing fluid inlet and a fracturing fluid outlet, wherein compact sponge is adopted at the upper ends and the lower ends of the two parallel organic glass panels to serve as an interlayer, rubber pads are adopted on the left side and the right side to serve as interlayers to form simulation crack sections, the compact sponge is adopted at the upper end and the lower end to serve as the interlayer, only a liquid phase is allowed to pass, and a solid phase isn't allowed to pass; the fracturing fluid inlet and the fracturing fluid outlet are designed at the left end and the right end of the simulation crack section, are located at the centers of the parallel panels and are rectangular; and devices for collecting filtrate are arranged at the upper end and the lower end of a leak-off liquid collecting part of the fracturing fluid, and valves are mounted at upper and lower outlets and can be used for adjusting the leak-off speed and the leak-off amount. The device can simulate various true conditions such as sand carrying condition, sand paving condition, migration rules, leak-off and the like of the fracturing fluid entering the crack, and a basis is provided for preference of fracturing displacement, speed and sand ratio and the formula during fracturing design.

Parallel panel crack simulation device under leak-off condition of fracturing fluid

A model suitable for evaluating a tight sandstone reservoir is established. The model includes two oil-water replacement modes: capillary force mode and osmotic pressure mode. The relationship between oil-water displacement rate and dimensionless time under different parameters is drawn considering the influence of capillary force, osmotic pressure, production pressure difference, and starting pressure gradient. Results indicate that the higher the relative permeability of the water phase, the lower the relative permeability of the oil phase, the smaller the oil-water viscosity ratio, and the higher the oil-water replacement rate. The relative permeability of the water phase also affects the infiltration stabilization time. Low salinity fracturing fluid infiltration helps to improve the oil-water replacement rate.

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Zhou Desheng

Papers

Formation mechanism of the Upper Triassic Yanchang Formation tight sandstone reservoir in Ordos Basin—Take Chang 6 reservoir in Jiyuan oil field as an example

Hydraulic fracture propagation direction during volume fracturing in unconventional reservoirs

Induced Stress and Interaction of Fractures During Hydraulic Fracturing in Shale Formation

Parallel panel crack simulation device under leak-off condition of fracturing fluid

On the Imbibition Model for Oil-Water Replacement of Tight Sandstone Oil Reservoirs