Important equations – water shutoff and conformance

This Excel spreadsheet from Randy Seright compiles the essential equations and technical formulas used in the design, evaluation, and optimization of water shutoff and conformance treatments in oil and gas reservoirs. It is intended for reservoir engineers, production engineers, and field practitioners who work with gels, relative permeability modifiers (RPMs), and other conformance solutions.

What’s inside:

• Radial flow and injectivity equations (Darcy-based) adapted for near-wellbore vs. far-field effects
• Shear rate vs. distance from wellbore to guide gel and polymer performance predictions
• Material balance and volume calculations for bullhead and selective treatments
• Fracture vs. matrix diagnostics to differentiate big vs. small thief zones
• Design support for slug size, placement strategy, and expected resistance factors

These formulas are field-tested and grounded in SPE literature and real-world case studies, making the file both a learning tool and a practical calculator.

Format:

• Clean Excel layout with named parameters, editable units, and automatic calculations
• Pre-filled examples to guide usage and interpretation
• Suitable for integration into your internal workflows or design sheets