Geomechanics of Oil and Gas Wells by Vladimir Karev & Yuri Kovalenko & Konstantin Ustinov

Author:Vladimir Karev & Yuri Kovalenko & Konstantin Ustinov
Language: eng
Format: epub
ISBN: 9783030266080
Publisher: Springer International Publishing

The latex shell is being dried at room temperature for several hours. The shell created on the side faces in this way is being made thin enough, not more than 50 µm, so as not to introduce a significant error in the results of measuring specimen strains. And at the same time, such a shell has sufficient strength and elasticity to ensure the tightness up to the formation of macro cracks in the specimen.

The Automatic Permeability Measurement System (APMS) is used directly for permeability measurement during the experiment, which allows continuous monitoring of the permeability change during the specimen testing on TILTS.

APMS is equipped with two flow meters that allow to measure an air flow rate in a wide range: from 0.5 ml/min to 5 l/min, and also two digital pressure gauges measuring pressure at the inlet and the outlet of the specimen. Signals from the flow meters and pressure gauges are transmitted to the controller of the automated control system, processed, displayed on the monitor and recorded to computer memory.

Preliminarily the range of pressure values at the inlet of the specimen is set, for which the dependence of air flow rate on the difference of squares of inlet and outlet pressure is linear (pressure at the outlet or the specimen is always atmospheric ). The air pressure during the test of the specimen is set in this interval, where the gas flow is described by Darcy law. Then the permeability coefficient is determined by

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