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Rheological Testing
This test determines the apparent flow properties of well fluids.
Fluid Loss
The Fluid Loss test determines the relative effectiveness of a slurry, in retaining its water phase, or losing a portion of its water phase as a filtrate to a formation. Insufficient fluid loss control can result in a cement slurry dehydrating and bridging off the annulus, which can prevent the slurry from being pumped to its final location and leaving excess cement in the casing.
Thickening Time
Thickening time of a slurry is calculated to determine the time required to mix and pump the slurry. Mixing time for the volume is estimated from calculated slurry volume and mixing rate. Mixing rate varies from rig to rig, and is dependent on slurry design. Safety time is allowed to account for any shut down or slow mixing rates that may inadvertently occur.
Free Fluid
Density Checks
This test is conducted by pressurizing the sample cup, until the entrained air or gas can be decreased to a negligible volume. Once void space is removed, a slurry density measurement closely in agreement with the true density which will be realized.
Static Gel Strength (SGS)
This test allows an operator to study the slurry’s transition from a liquid to solid state.
Gas Migration
This test is used to evaluate a cement slurry’s susceptibility to invasive gas or liquid flow, by realistically simulating the well parameters including temperature, hydrostatic head pressure, fluid formation pressure and the pressure gradients that drive these invasive flows.
Compressive Strength
This test determines the compressive strength of set cement samples under confining stress.
Viscosity
This type of test measures a fluid’s resistance to flow, typically using a Marsh funnel, a direct-indicating Rheometer, a low shear Viscometer, or a HTHP Viscometer.
Filter Press Test
This test evaluates a fluid’s loss of the liquid phase through a filter disc, simulating formation fluid loss. Variations of this test include API Filter press, HTHP Static Filter Press, and HTHP Dynamic Fluid Loss.
Permeability Plugging Test
This test is essentially an inverted HTHP FL cell, and it evaluates Lost Circulation Material additives and their ability to prevent fluid loss through a permeable aloxite disc or slotted stainless steel disc.
Lubricity & EP
This test determines a drilling fluid or lubricant’s ability to reduce drag between two hardened steel surfaces – a block, and a ring rotating at 60 RPM.
Solids Analysis
This category of testing is useful to gather information about the solid and liquid components of a drilling fluid. Tests include Retort Analysis (% Solids, Oil, Water), Full Solids Analysis Low Gravity Solids, Total Salinity, Soluble NaCl, etc.), Sand Content, Total Suspended Solids, and other tests.
Particle Size Analysis
This test measures the net volume of solid particles in each of the various size ranges, given as a percentage of the total solids of all sizes in the sample.
Electrical Stability
This test is used to measure the emulsion and oil-wetting qualities of oil based drilling fluids.
Chemistry Analysis
API Recommended Practice 13B-1 & 13B-2 contain procedures used to test some major chemical components of water-based and oil-based drilling fluids. A few examples are concentration levels of Alkalinity, Calcium, Chlorides, and Hydrogen Sulfide.
Post time: Apr-11-2022