CALCULATIONS FOR NAF BASE MUDSCalculating the NAF /

CALCULATIONS FOR NAF BASE MUDS

Calculating the NAF / Water Ratio Lime, (ppb) % CaCl2 Calcium Chloride Salt (ppb) Solids: (ppb) Barite and (ppb) LGS Corrected % Solids Changing the NAF/WATER Ratio INVERT EMULSION CALCULATED DATA

NAF / WATER RATIO Calculated from retort data alone. Percent NAF Percent water The NAF / water is based on the liquid phase of the mud. The NAF / water is the ratio of the percentage of the liquid phase of the mud that is NAF to the percentage of the liquid phase that is water.

Retort: %NAF = 63, %water = 27, %solids = 10 NAF % of liquid phase = 63/(63 + 27) = 70 Water % of liquid phase = 27/(63 + 27) = 30 Check: 70% + 30%= 100% Ratio = 70:30 Retort: %NAF = 42, %water = 18, %solids = 40 NAF % of liquid phase = 42/(42 + 18) = 70 Water % of liquid phase = 18/(42 + 18) = 30 Check: 70% + 30%= 100% Ratio = 70:30 Note: Even though the NAF / water ratio is changed as the mud weight changes, the percent solids has no effect on the actual NAF / water calculation. Calculate... NAF / Water Ratio

EXCESS LIME, ppb Vsa, or Psm or Pom = ml of 0.1N H2SO4

EXCESS LIME, ppb (Example) POM = 4.7 ml of 0.1 N H2SO4

Calculations: % by Wt. CaCl2 CaCl2 % by Wt. = WHERE: (ml AgNO3  1ml Mud) = Cl- from report divided by 10,000

Calculate Weight Percent Calcium Chloride Retort: Oil% = 42, Water% = 18, Solids% = 40 The titration with 0.282N AgNO3 = 7.7 ml AgNO3 / 2ml mud

Calculations: ppb CaCl2 ppb CaCl2 =

CALCULATED CALCIUM CHLORIDE, ppb Retort: Oil% = 42, Water% = 18, Solids% = 40 The titration with 0.282N AgNO3 = 7.7 ml AgNO3 / 2ml mud

There Are Times When It Is Desirable To Change The NAF / Water ratio. It may be desirable to INCREASE the NAF / Water ratio when: A saltwater flow has lowered the ratio. The mud weight is being raised significantly. The percent solids and/or rheology is too high. It may be desirable to LOWER the NAF / Water ratio when: The weight of a mud is being lowered at a liquid mud plant. Higher rheology is needed. The ratio has changed from evaporation on a high temperature well. NAF must be added to raise or increase the NAF / Water ratio. Water must be added to lower or decrease the NAF / Water ratio. To go from 70:30 to 80:20, add NAF. To go from 70:30 to 60:40, add Water. Changing the NAF / Water Ratio

Calculate NAF / Water Ratio Retort: %NAF = 63, %Water = 27, %Solids = 10 NAF % of liquid phase = 63/(63 + 27) = 70 Water % of liquid phase = 27/(63 + 27) = 30 Check: 70% + 30%= 100% Ratio = 70:30 Decrease the NAF / Water ratio to 60:40

1. BBL H2O / BBL MUD = 2. BBL NAF / BBL MUD = WHERE: NAFRd = NAF RATIO DESIRED ( Whole number ) WRd = WATER RATIO DESIRED ( Whole number ) % NAF = % NAF From retort (Whole Number) % H2O = % H2O From retort (Whole Number) Calculations: Changing the NAF / Water ratio

Calculate NAF / Water Ratio Retort: %NAF = 63, %Water = 27, %Solids = 10 NAF % of liquid phase = 63/(63 + 27) = 70 Water % of liquid phase = 27/(63 + 27) = 30 Check: 70% + 30%= 100% Ratio = 70:30 Increase the NAF / Water ratio to 80:20

1. BBL H2O / BBL MUD = 2. BBL NAF / BBL MUD = WHERE: NAFRd = NAF RATIO DESIRED ( Whole number ) WRd = WATER RATIO DESIRED ( Whole number ) % NAF = % NAF From retort (Whole Number) % H2O = % H2O From retort (Whole Number) Calculations: Changing the NAF / Water ratio

Wetting Agent to add when adding Barite: One quarter (0.25) to one half pound (.5) of wetting agent for every sack (100#) of barite added to the system. Emulsifier to add when emulsifying Water: (Pounds) = [(bbls brine)* x (8±)] *(bbls brine / bbl mud) = [bbl water / bbl mud]  [Water fraction (bbl) ] (from equation #1) (Table 2 pg. 11.32) (25% CaCl2 = 0.922) Lime to add: pound for pound with Mul, Mod and MI-157 INVERT EMULSION TREATMENTS: