By Amoco

Result of huge learn at either Amoco construction examine, Tulsa, and within the box convey that penetration price and its reaction to weight on bit and rotary pace is very depending on the hydraulic horsepower achieving the formation on the bit. because the drilling fluid circulate expense units the approach strain losses, and those strain losses set the hydraulic horsepower around the bit, it may be concluded that the drilling fluid is as very important in identifying drilling bills as all different “man-ntrollable” variables mixed.

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Extra resources for Drilling Fluids Manual

Example text

0 Using the same material balance approach, write an equation to represent the problem and substitute representative values for the terms. Old Fluid + Dilution Water = New Fluid (VI) (MWI) + (VW) (DW) = (VF) (MWF) Or Substitute the product density and volume for each term in the equation. Since it is not known how much water will be needed, the volume of water is represented by (x). The volume of the 9 lb/gal fluid is equal to the Old Fluid volume plus the volume of water added. Thus, the New Fluid volume equals 500 + x.

Rev. 6/94 Amoco Production Company Drilling Fluids Manual Figure 7 Pressure Losses in a Circulating Mud System Figure 8 Types of Formation Damage Formation clays around sand grains in equilibrium with water (maximum permeability). Formation clays swollen and dislodged by low salinity filtrate. Blocking of pore throats causes loss of permeability. Undamaged Fines Migration Oil flow restricted by water block (oil wet sandstone). Oil flow restricted by waterblock (wet water sandstone). Wettability Alteration Rev.

Total Mud Volume = Pit Volume + Hole Volume 2. Pump Output Volume - Pump output tables must be adjusted for estimated or measured pump efficiencies. Triplex pumps usually have an efficiency between 90-98%. Double action duplex pumps usually have an efficiency between 85-95%. The following two equations calculate pump output at 100% volumetric efficiency. The constant, K, may be changed to obtain units of bbl/STK, gal/STK, or Liter/STK. Q Duplex = [ 2 ( ID LINER ) 2 – ( OD ROD ) 2 ] ( L STK ) a.