Detailed Product Description

Dynamic HPHT filtration testing determines if fluid is properly conditioned to drill through permeable formations. Test results include two numbers: the dynamic filtration rate and the cake deposition index (CDI). The dynamic filtration rate is calculated from the slope of the curve of volume versus time. The CDI is calculated from the slope of the curve of volume/time versus time.

Utilizing a wide range of available filter mediums, the DYNAMIC HPHT filtration system can be heated and pressurized to provide the closest possible simulation of down-hole conditions. Several safety features have been designed into the system to protect the user and help ensure reliable test results.

The filter medium is a thick-walled cylinder with rock-like characteristics to simulate the build-up of filter cake on the formation. The filter medium is available in varying porosities and permeabilities to simulate down hole formations.

Filtration occurs radially from the inside of the filter core to the outside. At the same time, the filter cake is formed on the inside of the filter core to simulate filter cake formation on the wall of a borehole. Following completion of a test, the filter cake can be inspected visually. A polished stainless steel shear bob runs through the central axis of the filter core. The shear bob is rotated to produce a concentric cylinder-type shear across the filtration surface.

The LCD display allows monitoring of real-time test results, which are printed for further analysis and filing of test results. The DYNAMIC HPHT filtration system also features an interface port, which allows downloading of ASCII-formatted data to a personal computer. The system is fully automatic with a built-in computer controller.

Through menu-driven software, the user can establish up to 20 sequence steps to program the following testing parameters:

• Temperature
• Pressure
• Differential pressure
• Shear rate

Operational Features

            Fully automatic control with built-in computer controller; 8-line, 40-column LCD display; 16-key input control; menu-driven software

            Ramping of temperature, pressure, differential pressure, and shear rate can be established with up to 20 sequence steps

            Automatic volume collection of filtrate; data reported in 1/3 cc increments

            Interface port for downloading of ASCII-formatted data to a personal computer via RS232 link and operators communication program

            Each data point comprised of elapsed time, total volume of filtrate, pressure, differential pressure, sample temperature, and shear rate

            Data from most recent test stored in non-volatile memory, which allows user to view data on LCD display, print for hardcopy analysis, or download to PC

            Two test sequences stored in memory:

  - Standard test that cannot be edited by operator

  - Most recent test sequence used, which can be retrieved and edited before use

            Audible tones to alert user of outer limit parameters

            Built-in pump for automatic purge cycle to saturate the core and clear air from pressure lines; magnetically-driven pump to eliminate dynamic seals and leakage potential

            Single pressure port for high pressure; back pressure regulated automatically

            External yoke cell that requires no threaded closures; threaded bottom cap to facilitate cell loading and unloading

            Magnetically-driven shear bob with rpm monitoring; 30-1000 rpm rotation speed

            Quick-connect fittings on filtrate hoses

Safety Features

            Rupture disk on high pressure gas supply

            Safety pressure relief valve on the heated, pressurized cell

            Independent over-temperature shutdown

            Heater and motor cut-off interlock door when door is opened

            Automatic cool-down upon completion of test

            Proper positioning of cell and collector required before system will pressurize

            Pressure must be relieved to less than 5 psig before the cell can be disassembled for cleanup 
           Cell design uses no stressed threaded closures, no set screws or caps which require    tightening

            Cell constructed of Monel K500 with stainless steel end caps

            Unit has no welded joints on stressed parts

            All stainless steel pressure fittings

Ordering Information

Specifications