Properly run and interpreted, cement-bond logs (CBL) provide highly reliable estimates of well integrity and zone isolation.

by

Richard Leeth

Casedhole Solutions

Presented to the

GEOLOGY & WELL TECHNOLOGY SECTION FALL 2015 WELL LOGGING WORKSHOP

September 2, 2015

Examples in this presentation are courtesy of Halliburton, Schlumberger, Baker Atlas, NCPS, FMC and many other witty forunners of this methodology.

Theory of Measurement

• Measures Sound Wave Amplitude (m-volts)

• Measures Sound Wave Transit times (usec)

VDL – Variable Density

Cement to Pipe Bond & Formation VDL

Cement Quality 1

Cement Quality 2

Cement Compressive Strength

Quality Control CBL – Cementing & Drilling

• Poor Centralization

• Cement Shrinkage or Micro-annulus

• Drilling fluids

• Cement density

• Deviated Wells

• Cement setting time.

• Inefficient Pre-flush

Micro Annulus – Pressure Logging

Open Hole Data –vs.- Travel Time Log

• Red – TT3

• Blue – Rhob

• Coal Seams

• Coal Seams

• Coal Seams

Parted Casing Example

Log presentation for the Baker Atlas SBT tool containing individual log curves, cement map, and VDL display (courtesy of Baker Atlas)

EPA - Injection Well Mechanical Integrity

EPA - Injection Well Mechanical Integrity

EPA - Injection Well Mechanical Integrity