OFITE Cement Permeability Tester


Item:	120-87
Description:	Model 90 Cement Permeability Tester

The primary function of a well cement is to isolate/seal the casing from the well bore. This seal prevents the migration of fluids into the annulus and upwards to the surface. Therefore, it is imperative that a well cement exhibit very low permeability. Permeability is a measure of the ability of a fluid to flow through a porous media when subjected to a differential pressure and is mathematically equated by Darcy's law. In equation form:

k=2000QuPOL/(A(PI2-PO2))

where:

Q = Flowrate
k = Permeability
A = Cross Sectional Area
PO = Outlet Pressure
PI = Inlet Pressure
u = Viscosity
L = Length

The OFITE Cement Permeability Tester is utilized to measure the permeability of cement specimens one inch in diameter and one inch in length. Nitrogen at a constant flow rate is forced through the cement and the differential pressure across the cement is measured. The flowrate is measured with calibrated flowmeters. Viscosity is easily determined by the use of nitrogen property tables. These variables are incorporated into Darcy's law to calculate cement sample permeability. The OFITE Cement Permeability Tester may be used to test cements in accordance to API Specification 10.

Method of Operation:
A cement specimen is placed into a sleeve which is then inserted into the "Modified Hassler" style test cell. Nitrogen is displaced through the cement at various flowrates to determine the permeability.

Features and Specifications:
-"Modified Hassler" cell accommodates 1" diameter specimens
-Specimen length is one inch
-Instrumentation gauge displays driving pressure
-All Hassler components fabricated from 316 stainless steel
-Nitrogen utilized as test fluid
-Unit conforms to API Specification 10 guidelines

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