API Dynamic Settling June 11-15, 2012

Project Goals Design four systems for cooperative testing. System 1 Pass API Sedimentation Test Fail Dynamic Modified Paddle Test System 2 Pass API Sedimentation Test Pass Dynamic Modified Paddle Test System 3 Hematite System that Fails Dynamic Modified Paddle Test System 4 Spacer System that Passes Dynamic Modified Paddle Test

Parameters Standard API Test Schedule Depth and Temperature Depth 10,000 feet BHST = 250 °F, BHCT = 180 °F BHP = 6300 psi API Casing Schedule 50 minutes to BHCT and BHP

Cement Materials for System 1 Cement LaFarge Joppa H Sand 100 mesh Silica Sand Weighting Agent Hematite Retarder/Fluid Loss Diacel LWL Extender Bentonite

Slurry Test Plan Rheology Atmospheric Consistometer conditioning Pressurized Consistometer conditioning Free Water Atmospheric Consistometer conditioning - Vertical Pressurized Consistometer conditioning - 45°Angle Thickening Time Include motor shut-off API Sedimentation Dynamic Modified Paddle

System Design 1 Class H + 35% Sand + 25%Hematite + 0.5% Diacel LWL Density 18.0 ppg Yield 1.43 cu ft/sack Mix fluid 5.07 gallons/sack Solid Volume Fraction 52.8%

System 1 - Rheology

System 1 – Free Water Atmospheric Conditioning 20 minutes at BHCT Trace Free Water Slight Settling

System 1 – Free Water 45° Angle Pressurized Conditioning 50 minute Heat-Up + 20 minutes at BHCT BHP 6300 psi 4.5 mLs Free Water Channeling to 225 mLs Slight Settling

System 1 – Thickening Time Motor Shut-Off Test

System 1 – API Sedimentation Pressurized Conditioning + 20 minutes at BHCT Maximum Difference = 7.8 %

System 1 – Modified Paddle Slurry Density = 18.1 ppg Top Density = 17.7 ppg Middle Density = 18.1 ppg Bottom Density = 18.8 ppg Cone Height = 1.5 inches 25 rpm

System Design 2 Class H + 35% Sand + 25%Hematite + 1% Bentonite + 0.5% Diacel LWL Density 18.0 ppg Yield 1.44 cu ft/sack Mix fluid 5.07 gallons/sack Solid Volume Fraction 52.9%

System 2 - Rheology

System 2 – Free Water 45° Angle Pressurized Conditioning 50 minute Heat-Up + 20 minutes at BHCT BHP 6300 psi 4 mLs Free Water No Channeling No Settling

System 2 – Thickening Time Motor Shut-Off Test

System 2 – API Sedimentation Pressurized Conditioning +20 minutes at BHCT Maximum Difference = 3.3 %

System 2 – Modified Paddle Slurry Density = 18.1 ppg Top Density = 17.5 ppg Middle Density = 17.8 ppg Bottom Density = 19.2 ppg Cone Height = 1 inch 25 rpm

System Design 3 Hematite System that Fails Dynamic Modified Paddle Test Class H + 42%Hematite + 0.2% Retarder + 0.2% Antifoam Density 19.0 ppg Yield 1.20 cu ft/sack Mix fluid 4.40 gallons/sack Solid Volume Fraction 50.8%

System 3 - Rheology

System 3 – Free Water and Settling 45 degree Free Fluid at 180°F 3.2% Free Fluid Dynamic Modified Paddle Settling test 1 inch of Cone Height Top Density = 18.2 lb/gal Middle Density = 19.2 lb/gal Bottom Density = 19.4 lb/gal

System Design 4 Spacer System that Passes Dynamic Modified Paddle Test Chemplex 50 lb/bbl C63 Spacer lb/bbl Barite bbl Water Density 14.0 ppg Solid Volume Fraction 25.3%

System 4 – Free Water and Settling 45 degree Free Fluid at 180°F 0% Free Fluid Dynamic Modified Paddle Settling test No Measurable Cone Height Top Density = 13.3 lb/gal Middle Density = 13.9 lb/gal Bottom Density = 14.0 lb/gal