Research And Control Of Oil Gas Water Three Phase Facility

Multi-phase facility is a very important method for the study of multi-phase flow problem, either for theoretical study or for practical study. Nowadays most of Multi-phase facilities are in miniature. They are widely existed in multi-phase research organizations. Because of these, an Oil-water-Gas multi-phase facility was planned to build at Automatic Meters & Devices department, School of Electrical Engineering & Automation of Tianjin University in 2003. On the premise of lower cost and more powerful function, every part of the Oil-Water-Gas multi-phase facility and its control system was studied in this paper. The facility had a stimulant oil well, which can incline from 0-90 degree, and had 40m horizontal pipe, which diameter was 50mm. At this facility, water/gas, oil/gas, oil/water, oil/gas/water multiphase flow can be obtained, and bubble, slug, annular, churn and mist flow patterns can be created. In the project, a combination meter is contrived to measure the single-phase flux, by this mean,every flow meter in the facility's pipe line worked in its normal flux range, the accuracy was raised and the cost was reduced. After the facility accomplished, the water measurement accuracy can get to ±0.5% in the range of 0.5-380 m3/d; the oil measurement accuracy can get to ±0.5% in the range of 0.5-380 m3/d; And the gas measurement accuracy can get to ±1.0% in the range of 6-5400 m3/d. In the design, PC-BASED control system was used to control the multi-phase facility. Its hardware is Industrial Personal Computer (IPC) and data collection boards. This configuration could provide speedy data transfer and extend easily. Its software is developed by general configuration software Monitor and Control Generated System (MCGS) and Visual Basic. MCGS performed the interfaces and Visual Basic performed data processing, and they communicate with a special interface. This compounding program method can shorten development period and reduce the cost. After the facility accomplished, its flux adjusted accuracy can get to 1.5% and the pressure source's stability uncertainty less than 1%, what is more, the facility can process long time experiments. The Oil-Water-Gas multiphase facility can simulate petroleum exploitation and pipeline transfers, identify the multi-phase modality and demarcate multi-phase flow meter in the laboratory. It is a multi-function low-cost mini type facility.