Filter Cores for Dynamic HPHT^® Filtration System

Fann engineers designed special filter cores for the Model 90 Dynamic HPHT Filtration System to conduct filter cake formation and permeability analysis.

The filter medium is a thick-walled cylinder with rock-like characteristics to simulate the build-up of filter cake on the formation. This provides more accurate filtration measurements. The entire internal length is subjected to pressurized fluid (sample). Filtrate flows through the core radially from the inside to the outside.

The filter medium is available in varying porosities and permeabilities to simulate down-hole formations.

Filter Cores are supplied in boxes of 10 cores of the same porosity.

Filter Paper

This Filter paper is a calendared, hardened, qualitative low-ash filter paper used to filter fine precipitates with the following qualities:

• A very slow, extra dense paper made from 100% cotton linters
• Lint-free surface
• Highly resistant to acid and alkaline solutions.

Particle Retention

All paper grades are described by the type of particles retained, in accordance with ASTM Standard Methods. The particle size retention range for this paper is 2-5μm (microns). The filter paper meets or exceeds the standards established by the American Petroleum Institute as published in API Recommended Practice 13B-1 and API Recommended Practice 13B-2.

Filter Press Cell Clamp

HPHT Filter Press Cells are commonly used to test drilling fluids under high-pressure and high-temperature conditions. During this testing the possibility exists that the test fluid may solidify and plug the entrance and exit valve stems to the cell. Laboratory technicians are increasingly concerned about opening a HPHT Filter Press cell with pressure trapped inside.

Fann has developed a bench top cell clamp to maintain force on the lid while the set screws are removed. Once the screws are removed, the lid can be allowed to slowly rise and release any trapped pressure in a controlled manner.

Two height clamps are available for the different cell sizes.

Filter Press HPHT 500 ML

500 ml HPHT Filter Press units can be pressurized to 1800 psig on the cell and 750 psig on the back pressure receiver. Maximum operating temperature is 500°F. For operation above 400°F, the filter paper should be backed with a glass fiber filter, or a stainless steel filter.

HPHT Filter Presses are available in various component configurations which allow for greater flexibility in choosing the system and options that suit each individual need:
Pressurization with CO2 Cartridges, bottled Nitrogen, or an in-house (user provided) source.

Single or double opening cells that accept different filter media.

Filter media that includes the API standard Filter Paper, Ceramic Discs of several calculated porosities, and various mesh sized screens.

Filter Press HPHT 175 ML

175 ml HPHT Filter Press units can be pressurized to 1800 psig on the cell and 750 psig on the back pressure receiver. Maximum operating temperature is 350°F.

HPHT Filter Presses are available in various component configurations to allow for greater flexibility in choosing the system and options that suit each individual need.
Pressurization with CO2 Cartridges, bottled Nitrogen, or an in-house (user provided) source.

Single or double opening cells that accept different filter media.

Filter media that includes the API standard Filter Paper, Ceramic Discs of several calculated porosities, and various mesh sized screens.

Static Fluid Loss Test

Dual Cell Fluid Loss Test Assembly

The Fluid Loss Test Assembly provides a reliable means of determining the fluid loss characteristics of an oil well cement. Fluid Loss Testers measure fluid loss of cement slurries, drilling fluids, and fracturing fluids under elevated pressure and temperature conditions.

Fluid Loss Cells are fitted with a 325 mesh screen [3.5 in2 (22.6 cm2) filtration area] backed by a 60 mesh screen. The 60 mesh screen provides a flow path for the cement filtrate as outlined in API Recommended Practice 10B. Cells are provided with openings on both ends with caps (double ended) for ease of maintenance.

Stirring Fluid Loss Test

Conveniently located controls and indicators allow precise setting and control of temperature and pressure.

The Stirring Fluid Loss Test Assembly provides a reliable means of determining the fluid loss characteristics of an Oil Well Cement. This apparatus simulates down-hole conditions where fluid loss can occur. When cement slurry is circulated past a permeable zone, pressure behind the slurry can force fluid out of the slurry and into the zone. Circulation is simulated by a stirring apparatus and circulation temperature is simulated by a heating jacket. The pressure differential between annular and formation pressure is simulated by pressurized nitrogen. A screen (or porous core) and a filtration chamber simulate the permeable zone.

Slurry preconditioning and testing are performed in the same cell, eliminating the need to cool, or transfer hot test slurry, possibly changing the properties of the test slurry.

While the slurry is being heated, the stirring paddle maintains slurry uniformity. Nitrogen pressure is applied to the test fluid. Filtrate is forced through a filter medium. Fluid loss is measured as filtrate volume per unit of time.

Stirring Fluid Loss Cells are fitted with a 325 mesh screen [3.5 in² (22.6 cm²) filtration area] backed by a 60 mesh screen. The 60 mesh screen provides a flow path for the cement filtrate as outlined in API Recommended Practice 10B. Cells are provided with openings on both ends with caps (double ended) for ease of maintenance.