Chesapeake Energy – DFIT Explanation
Company: Chesapeake Energy
Speaker/Representative: Julian Carillo – Completions Manager
Company BG: 2nd largest producer of Natural Gas in country, $17.5 billion revenue (2013), 5300 employees (2013)
Meeting Overview: Technical Presentation on DFIT’s in Completions Designs
Use of Diagnostic Fracture injection tests in completions design
DFIT – help with calibration of rock mechanics and true measure of permeability
Fracking model process
- Stage 1 Scoping (wire line data)
- Stage 2 Velocity modeling (core measurements to relate vertical log data to core velocities at multiple angles)
- Stage 3 Elastic modeling in lab (critical dynamic modulic corrections
- Stage 4 Field calibration (tie stress model to observed minimum horizontal stress values)
DFIT procedure
- Break down formation
- Create a short fracture (small volume pumped without proppant)
- Observe pressure falloff
Types of DFITS
- Conventional vertical well
- Horizontal to DFIT before fracture
Section 1
Start injection à pressure up wellbore (compress fluid),
Section 2
Still injection, drop in pressure (passing near wellbore stress concentration), propagating fracture
Section 3
Injection stopped (shut in period started), ISIP- instantaneous shut in pressure (reduction due to frictional pressure)
Section 4
still shut in, fluid continues to leak off and then the fracture closes
Section 5 &6
do stuff with graphs and draw conclusions from it
SPE 107877 – Holistic Fracture Diagnostics (helpful paper about this entire process)
Completions
3 major aspects
- How long fracking takes
- Conductivity
- How close the clusters need to be
