LPLT Filter Press Instruction Manual
207128
Revision G, September 2012
18
9.
Measure the volume of filtrate collected in the graduated cylinder. Record the
volume in milliliters as the API 30 minute filtrate loss of the drilling fluid.
10.
Loosen the T-screw, remove the cell top, and then remove the cell from the
frame.
11.
Discard the drilling fluid.
12.
Disassemble the filter cell and carefully remove the filter cake and filter paper
from the base cap.
13.
With a gentle stream of water, carefully wash excess drilling fluid from the
cake. For oil-based drilling fluids, use a clean base oil to wash the filter cake.
14.
Measure and record the thickness of the filter cake to the nearest 1/32 in. to the
nearest millimeter.
15.
Record properties of the filter cake such as texture, hardness, flexibility, etc.
You can record the filtrate volume collected after 7 ½ minutes.
Multiply this value by two to obtain a rough estimate of filtrate
volume that will be collected in 30 minutes. This estimated value
is usually one or more milliliters less than the actual volume. This
estimation procedure should not be used for drilling fluids that
have a filtrate loss of less than 5 ml in 7 ½ minutes.
