ANSI API RP 13M-6:2020 pdf download.Procedure for Measuring Leakoff of Completion Fluids Under Dynamic Conditions.
ANSI API RP 13M-6 provides consistent methodology for measuring the fluid loss of completion fluids under dynamic conditions. ANSI API RP 13M-6 is applicable to all completion fluids except those that react with porous media.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
backpressure
constant pressure maintained at the leakoff port
2.2
cell
tool that contains the core and maintains test conditions such as test temperature and confining pressure
NOTE Cell orientation is defined according to whether the long axes of the core are horizontal or vertical.
2.3
filter cake
build-up of materials on core face or within the porous medium
2.4
filtrate
fluid exiting the core
2.5
fluid inlet
point at which fluid enters the gap
2.6
fluid loss
measure of fluid volume that leaks into a porous medium over time
2.7
gap
linear distance from the core face to the wall opposite the core face
2.8
shear-history simulator
apparatus used to simulate shear history in a fluid
3 Cell type
There are two different types of cell for measuring fluid loss under dynamic conditions:
4 Identification of test parameters (linear flow cells)
4.1 General
All calibrations shall be performed in accordance with the manufacturer’s recommendations.
4.2 Temperature
4.2.1 General considerations
Temperatures shall be measured to within ±1 °C (±2 °F) and stabilized to within ±3 °C (±5 °F) of the test
temperature.
4.2.2 Test temperature
The test temperature is the simulated temperature as defined by the fluid and cell temperatures.
4.2.3 Fluid temperature
Fluid temperature is the temperature of the test fluid measured at the fluid inlet.
4.2.4 Cell temperature
Cell temperature is the internal cell temperature representing the core temperature.
4.3 Pressure
4.3.1 Test pressure
Test pressure is the differential fluid pressure across the core length. It may be measured by a differential pressure transducer or calculated by subtracting the backpressure from the fluid pressure. It shall be controlled at 5 % of the design pressure.
4.3.2 FluId pressure
Fluid pressure is the pressure at the core face.
433 Backpressure
Backpressure is the pressure of the filtrate as it exits the core.
434 Confining pressure
The confining pressure is the pressure used to seal the core if a Hassler sleeve is used.
4.4 Test duration
The test begins when the differential fluid pressure is applied and shall continue for a minimum of 60 mm.
4.5 Shear rate
The shear rate of the test fluid across the core face shall be 40 s-1 ± 25 %.
4.6 Permeability
Using a compatible fluid, determine the permeability of the core prior to the test.ANSI API RP 13M-6 pdf download.