Fluid loss is one of important drilling fluid properties and two type of fluid loss are API and HTHP fluid loss. This article will explain about both of them and effect on the drilling operation.
API Fluid Loss Test
API Fluid Loss Test (low-pressure, low-temperature filtration test) is a test used to measure a filtration of mud with ambient temperature and 100 psi differential pressure. The API fluid loss testing equipment is shown below (Figure 1).
Figure 1 – API Fluid Loss Test Kit
How will the drilling mud be tested?
- Place a filter
- Add the sample into the testing chamber
- Place the chamber in the testing kit
- Apply 100 psi pressure
- Record volume for 30 minutes; at the end of the test the volume of filtrate will be recorded.
- Record thickness of filter cake
