Drilling problems such as stuck pipe, tight hole, washout, and sloughing can be related to shale stability.

The Fann Linear Swell Meter Model 2100 (LSM) helps determine shale hydration or dehydration by measuring the increase or decrease in length over time of reconstituted or intact shale core. Together the LSM and Capillary Suction Time (CST) tests determine the recommended mud system for drilling through a specific shale formation. First, a CST test is conducted to determine the correct inhibitor for the shale. Then, a variety of fluids are tested.

Graph LSM
Graph LSM

Test results are graphed to show the percent of swelling versus swelling time in minutes. The LSM test demonstrates the inhibitive effects of these various fluids on shale swelling.

Get to Know the Linear Swell Meter


Get to Know the Linear Swell Meter

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LSM Compactor
LSM Compactor


The two-cell, hand operated, hydraulic compactor unit is used to prepare a core test samples from drilled cuttings. It applies a constant pressure of up to 10,000 psi (68,940 kPa) for several hours to achieve a satisfactory shale core plug.


Ordering Information

Part No. 102123383  Linear Swell Meter System with Four-Place Head, Compactor, and Software

Part No. 102527580  Linear Swell Meter System w/o Compactor

Part No. 102100513   Additional Four-Place Measuring Head

Part No. 209745         Compactor Unit (Two Head)

Part No. 205722         Transformer for 230 Volt operation


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