Two large scale multiphase flow corrosion systems are mounted on an inclinable rig with the capability of operating at 0-90o inclination. This enables simulations of various multiphase flow regimes typical for wells and pipelines. The High-Pressure system and the Low-Pressure system, both 4” I.D. have capabilities ranging from corrosion experimentation at elevated temperatures and pressures to multiphase flow characterization and visualization to (see Figure 1).
The inclinable multiphase high-pressure system has all 316 stainless steel wetted parts, giving it the ability to operate at temperatures up to 120°C and pressures up to 70 bar in single-phase, two-phase (oil-water or gas-water) and three-phase (oil-gas-water) flow at any angle of inclination. Multiphase flow patterns such as: stratified, slug, annular-mist, etc., can be achieved. Water chemistry monitoring and control enables long term operation under stable and realistic conditions, simulating realistically situations found in the field, including use of crude oils and injection of corrosion inhibitors. The inclinable multiphase low-pressure system is made from acrylic and is intended for corrosion and water wetting experimentation in two-phase oil-water flow. In both systems, oil and water are pumped independently using progressive cavity pumps and a blower is used to move the gas. A liquid gas separator and an oil-water separator are integrated into the system, enabling complete separation and independent metering of the oil, water and gas flow (see Figure 2).
Both systems have multiple test sections for insertion of corrosion probes (LPR, ER, coupons), sampling ports, pressure taps for pressure drop and flow regime determination, water wetting conductivity probes, etc. (see Figure 3). The transparent acrylic test section allows for visualization of multiphase flow characteristics with high-speed video imaging (see Figure 4). and high-speed tomography (see Figure 5). The operational conditions for the inclinable High-Pressure system are shown in Table 1.
|Flow regime||stratified, slug, churn, annular mist;|
|Liquid flow rates||0.1 m/s to 5 m/s|
|Gas flow rates||up to 20 m/s|
|Temperature range||25°C to 120°C|
|Pressure range||1 bar to 70 bar|
|Liquids||deionized water, synthetic sea water, oil, and model oils, crude oil|
|Gases||CO2, inert/heavy gas (N2, SF6)|
|Instrumentation||corrosion rate (LPR, ER, coupons), water wetting , superficial liquid and gas velocities, flow regime determination, wall shear stress, pressure drop, high speed video recording, high speed tomography, pH, temperature.|