The “PIK-UIDK” installation for studying core samples mechanical properties

The “PIK-UIDK” installation is a multifunctional system designed to determine the elastic-strength and filtration-capacitive properties of core samples at reservoir conditions. The strength camera allows one- and three-axis core sample loading with simultaneous measurement of its longitudinal (axial) and transverse (lateral) deformations up to sample destruction, determining passing speeds of longitudinal and transverse ultrasonic waves, as well as assessing the pore space sample dynamics. The installation can be equipped with a filtration system to assess samples properties in contact with reservoir or process fluids.

The installation allows user to carry out measurements of elastic-strength properties of rock samples in accordance with GOST 27153.7-75, GOST 211532-84, GOST 21153.8-88, GOST 28985-91, ASTM standards for rock samples triaxial testing.

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Benefits/Capabilities:

Additional connectors for transmitting measuring and control signals in the strength camera for conducting specialized tests (using additional strain sensors, ultrasonic sensors for studying anisotropic rock samples properties, building volumetric models of crack development)
Ball bearing for samples proper alignment during testing
Special loading plates for core samples with supplying pore pressure ports, allowing to conduct electrical resistance measurements

Measured parameters

Sample resizing under compression
Sample tensile strength under uniaxial and triaxial compression
Static and dynamic Young’s modulus and Poisson’s ratios
Passing speed of longitudinal and transverse ultrasonic waves during loading
Open porosity continuous assessment during loading
Core samples electrical resistance measurement
Core samples liquid permeability measurement (with full crimping backpressure)

Technical specifications

Cell and triaxial compression system include:

triaxial compression cell;
supplying and maintaining crimp pressure system;
axial sample loading system;
data collection and analysis system;
ten 4-pin sealed leads for connecting sensors built into the strength camera (axial, circumferential deformation sensors, ultrasonic wave measurement sensors, temperature sensor);
5 pressure ports: axial, comprehensive, pore lower, pore upper, dropping.

Tested core diameter, mm	30, 38, 50
Tested cores length, mm	60, 80, 100
Comprehensive crimping pressure, MPa	up to 70
Pore pressure, MPa	up to 40
Axial static load, kN	up to 1000
Working temperature, °С	up to +150
Axial load control	force sensor
Maximum loading speed, MPa / min	60
Maximum loading speed, mm / min	5
Fluid-contact parts material	stainless steel, titanium
Capabilities	automatic control of axial and all-round crimping pressure testing with strain or deformation control

Testing plates set in the strength chamber includes:

upper plate on a spherical base with pore pressure port;
bottom plate with pore pressure port.

Tested core diameter, mm	30, 38, 50
Maximum working crimp pressure, MPa	70
Maximum working pore pressure, MPa	40
Maximum working temperature, °С	up to +150

Axial and transverse (circumferential) deformations monitoring system includes:

mounting rings set (upper and lower) for two LVDT deformation sensors located on opposite sides at angle of 180 ° to control axial deformation, mounted directly on the sample;
roller chain and sensor mounting device for measuring transverse (circumferential) deformations, mounted directly on the sample.

Tested cores diameter, mm	30, 38, 50
Maximum working crimp pressure, MPa	70
Maximum working pore pressure, MPa	40
Maximum working temperature, °С	up to +150
Axial strain sensors measuring range, mm	±3
Transverse strain sensors measuring range, mm	±2
Linear dimensions measurement accuracy, mm	±0,002

Ultrasonic velocity measurement system of longitudinal and transverse waves includes:

set of plates with compression and shear waves integrated sensors with pore pressure supply ports;
upper plate on a spherical support;
rigid fixation bottom plate.

Tested cores diameter, mm	30, 38, 50
Maximum working crimp pressure, MPa	70
Maximum working pore pressure, MPa	40
Maximum working temperature, °С	up to +150
Axial load, kN	up to 1000
Working frequency, MHz	1
Ultrasonic waves speed measurement range, m / s	от 500 до 9000
Ultrasonic vibrations source	• independent excitation of longitudinal and transverse waves • signal power smooth adjustment • computer and optionally manual control
Ultrasonic vibration preamplifier	• two independent channels, amplification up to + 40 dB, digital control interface • input protection
Oscillation recorder	• 100 MHz bandwidth • 2 independent registration channels • digital signal transmission to computer
Measurement results storage and processing	• marker determination of the first wave entry time • ability to save received signals in digital form • automatic calculation of sample elastic constants

Pore pressure maintenance system includes:

pumps for maintaining constant pore pressure and constant pore fluid flow rate;
differential pressure measuring unit;
automatic back pressure regulator.

Tested cores diameter, mm	30, 38, 50
Maximum working temperature, °С	up to +150
Maximum working pore pressure, MPa	up to 40
Constant flow rate maintenance ml / min	from 0,001 to 15
Flow rate maintenance accuracy,%	0.5 of the current value
Pressure maintenance accuracy, %	0,25 % from VPI
Differential pressure sensor measurement upper limit, MPa	1
Measurement accuracy, %	not more than 0,1
Working substance	water with a salinity of 300 g / l, oil
Capabilities	• maintaining a constant pressure drop across the sample by changing fluid flow • determination of pumped fluids volume.