Mini Frac Test ServicesFor Civil Engineering
Open Hole Mini Frac Testing
1. In-situ stress is an important design parameter for deep-buried tunnels.– Rock bursting and large deformation due to tunnel excavation
2. Mini-frac test is the most reliable method in measuring in-situ stress condition.
3. On the basis of our strength in serving the oil/gas sectors, has expanded our mini-frac (openhole) service to tunnel engineering.
Testing Equipment
• Manifold system:– Maximum pressure: 35MPa
– Maximum flow rate: 50L/Min; Minimum flow rate: 3L/Min
– Fine-controlled injection, flowback and bypass system
• Light weight pump (up to 60 MPa)
• Reusable downhole straddle packer：
– Maximum pressure: 85MPa(Diameter:33mm-190m)
– Testing interval: 0.5m-2.5m
– Equipped with downhole pressure and temperature sensors
Real Time Analysis and Decision Software
Deliverables From a Mini Frac Test, Openhole
Three principal stress components:– Sv, Shmin and Shmax
– Direction of the principal stress (impression packer)
– Formation fluid properties, e.g., permeability
One Application of Mini Frac Test Results
Some Example Test
