Acid Volume Calculator
Calculate acid volume, pump rate, bullhead volume, and estimated cost for matrix acidizing treatments in carbonate and sandstone formations.
Formation & Well Parameters
Wellbore Parameters
Vacid = Volume Factor × Perforated Interval
Vtubing = 0.0009714 × ID² × Depth (bbl)
Acid Volume
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Acid Volume
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Tubing Volume
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Annular Volume
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Total Job Volume
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Estimated Acid Cost
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Recommended Pump Schedule
Pump Rate Range
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Estimated Pump Time
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Acid Volume vs Perforated Interval
How this was calculated
Acid volume: V = Volume Factor (gal/ft) x Perforated Interval (ft). Volume factors are industry rules of thumb: 75-125 gal/ft for carbonates (15% HCl), 50-100 gal/ft for sandstones (mud acid).
Tubing volume: V_tbg = 0.0009714 x ID^2 x Depth (bbl). This is the displacement volume needed to push acid from surface to perforations.
Annular volume: V_ann = 0.0009714 x (Csg_ID^2 - Tbg_OD^2) x Depth (bbl).
Pump rate: Matrix acidizing must stay below the fracture initiation pressure. Typical rates are 0.25-2 bbl/min per 10 ft of interval for carbonates, lower for sandstones. Actual rate depends on injectivity test results.
Assumptions: Uniform formation, no natural fractures, no temperature correction on acid reaction rate. For accurate design, perform an injectivity test and use a reactive transport simulator.
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Book a free strategy call →Understanding Matrix Acidizing
Matrix acidizing is a well stimulation technique where acid is pumped into the formation below fracturing pressure to dissolve near-wellbore damage and improve permeability. In carbonate formations (limestone and dolomite), HCl acid dissolves the rock matrix, creating wormholes that dramatically increase flow capacity. In sandstone formations, a mud acid mixture (HF/HCl) dissolves clay particles and siliceous fines that clog pore throats.
The volume of acid required depends on the formation type, the extent of damage, the treatment radius desired, and the formation porosity. Industry rules of thumb provide starting points: 75-125 gal/ft for carbonates and 50-100 gal/ft for sandstones, but actual volumes should be refined through core flow tests and reactive transport modeling.
Pump rate is critical: too high and you fracture the formation (wasting acid in fractures rather than dissolving matrix damage); too low and the acid spends before reaching the target radius. An injectivity test before acidizing helps establish the maximum matrix rate.
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