HPHT Acoustic Velocity System

The HPHT Acoustic Velocity System (CT-AVH) measures compressional (P) and shear (S) wave velocities through a rock specimen held at simulated in-situ confining pressure, pore pressure and temperature. The transit-time data give dynamic elastic moduli for geomechanics and seismic work at reservoir conditions. The system belongs to the Coretest HPHT acoustic systems group.

How it works

A core plug is loaded between ultrasonic platens inside a pressure vessel. Confining pressure, pore pressure and temperature are the controlled variables, set by the pressure control unit and a pore-fluid vessel. An ultrasonic pulse is sent through the specimen from one platen and received at the other. The system records P-wave and S-wave transit times, derives velocities from the specimen length, and reports dynamic elastic moduli. Shear measurement is available in two polarizations, S1 and S2.

The standard envelope is confining pressure up to 700 bar (10,000 psi), pore pressure up to 700 bar (10,000 psi) and operating temperature up to 120 °C. Specimens of 1 in, 30 mm and 1.5 in diameter are accepted, with length up to 4 in. Wetted parts are stainless steel or Hastelloy. The pressure and temperature envelope and the transducer frequency are configured per project. Power supply is 110-220 VAC, 50/60 Hz.

What is included

• Pressure vessel with ultrasonic platens for P, S1 and S2 modes
• Pore-fluid vessel
• Pressure control for confining and pore pressure
• Temperature control to 120 °C: scope stated in the project datasheet

Specify for your project

• Confining pressure, pore pressure and temperature envelope for the test program
• Specimen diameter (1 in, 30 mm or 1.5 in) and length, up to 4 in
• Transducer frequency
• Wetted material, stainless steel or Hastelloy, according to the pore fluids
• Pore fluids to be used and pore-fluid vessel volume (project-dependent)
• Supply voltage, 110 or 220 VAC

This description defines the product family. Guaranteed performance, included hardware, exclusions, interfaces and acceptance criteria are stated only in the project-specific technical proposal and approved datasheet.

Features

• Confining pressure : Up to 700 bar (10,000 psi)
• Pore pressure : Up to 700 bar (10,000 psi)
• Operating temperature : up to 120°C
• Core sample diameter : 1", 30mm, 1.5"
• Core sample length : up to 4"
• Wetted parts: Stainless steel or Hastelloy
• Mode : compressional (P) and shear (S1 & S2)
• Power supply : 110-220VAC, 50/60Hz