Description
The horizontally mounted acid fracture conductivity cell is utilized to etch core samples with acid and subsequently determine short term and long term fracture conductivities under in-situ conditions of pressure, closure stress and temperature. The cell mainly comprises a cell body, an upper and lower piston and a set of right and left flow inserts. Three pressure taps monitor the pressure drop along the fracture. Three interconnected leak-off ports on the upper and lower cell pistons allow leak-off tests to be performed during acid etching and conductivity tests. The heated steel cell ensure an appropriate, constant temperature during the test. A thermocouple located in a dedicated port monitors the cell temperature. Unique removable end inserts enable a combination of acid etching, conductivity testing and flow-back testing to be performed in the same cell.
Specifications
|
Maximum closure stress
|
20,000 psi
|
|
Maximum pore pressure | 3,000 psi
|
|
Temperature
|
Ambient to 177°C (350°C)
|
|
Sample length
|
7 inches
|
|
Sample width
|
1.5 inches
|
|
Sample height
|
2 x 3 inches
|
|
Wetted part material | Hastelloy
|
Benefits
Multi-purpose cell (acid etching, leak-off test, fracture conductivity tests)
Uses specimen with large exposed surface area to acid
The use of thick core samples allows the leak off and wormhole phenomenon to be monitored during acid injection
Simulates fluid leak off, and therefore accounts for damaging effects of fracturing fluids.
Video presentation: