Hydroshearing Stability Map: Radius vs Fracture Orientation…

What is Hydroshearing Stability Map

The Hydroshearing Stability Map provides a critical tool for understanding the behavior of fractures created during hydraulic fracturing. This map plots fracture orientations and their distances from an injection well against a stability heatmap, which indicates the risk of induced seismicity based on pore-pressure diffusion.

By visualizing these parameters in a 2D phase-space, engineers can predict potential failure modes and optimize operational settings to ensure safe and efficient fracturing.

Governing Principles

The stability of fractures during hydroshearing is governed by the Mohr-Coulomb failure criterion. This criterion states that a material will fail when the shear stress on an internal plane exceeds the frictional strength, which depends on the normal stress and cohesion of the rock.

In the context of hydroshearing, pore-pressure diffusion from the injection well creates additional stresses in the surrounding rock, potentially leading to failure if these stresses exceed the material's strength.

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Why It Matters

Properly understanding and managing the stability of fractures is crucial for minimizing environmental impacts and ensuring the safety of nearby infrastructure. Uncontrolled fracturing can lead to induced seismicity, which can cause damage to buildings and other structures.

Additionally, optimizing fracture stability enhances the efficiency of oil and gas recovery by maximizing the area affected by the injection.

Real-World Examples

In the Bakken shale formation in North Dakota, for instance, understanding the stability map has been essential for managing induced seismicity. Operators use this information to adjust their fracturing strategies and minimize environmental risks.

Similarly, in the Marcellus Shale region of Pennsylvania, detailed stability maps have helped optimize well designs to achieve higher production rates while reducing the risk of fractures intersecting with groundwater aquifers.

Frequently asked questions

How does pore-pressure diffusion affect fracture stability?

Pore-pressure diffusion from the injection well increases stresses in the surrounding rock, which can exceed the material's strength if the pressure is too high or the distance to the well is insufficient. This increased stress can lead to failure along pre-existing fractures or create new ones.

What role does friction play in the stability map?

Friction between the rock and fluid plays a critical role in determining the stability of fractures. A higher friction coefficient increases the normal stress required for shear failure, thereby reducing the risk of fracture propagation under given conditions.

Can the stability map predict induced seismicity?

Yes, by tracking the magnitude of induced seismicity against the traffic-light protocol on the stability heatmap, engineers can predict and manage the risk of induced earthquakes. This helps in adjusting operational parameters to minimize environmental impacts.

How does changing the injection pressure affect the fracturing process?

Increasing the injection pressure can enhance fracture propagation by creating higher stresses in the rock. However, it also increases the risk of failure and induced seismicity if not managed properly. Adjusting this parameter is key to balancing production efficiency with safety.

Try it live

Everything above runs in your browser — open Hydroshearing Stability Map: Radius vs Fracture Orientation and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

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