Venturi Multiphase Flow Measurement based Active Slug Control

Abstract

Riser slug flow poses a significant challenge to offshore oil production systems, most especially for oil fields in their later life. Active control of slugging through choking has been proven a practical approach in eliminating riser slug flow in oil production pipeline-riser systems. However, existing conventional active slug control systems may reduce oil production significantly due to excessive over choking. Again, some of the existing active slug flow control systems rely on seabed measurements, which are difficult to maintain, costly to install, unreliable, and seldom readily available. This study is an experimental investigation of the feasibility of active riser slug control by taking topside differential pressure measurement from the inlet of the venturi flow meter to the throat. Experimental results indicate that under active slug flow control, the system was able to eliminate slug flow at a higher valve opening when compared to manual choking. A valve opening of 24% with riser base pressure at 2.85 bar from open loop unstable of 23% was recorded, which is superior to manual choking which maintained flow stability up to 21% valve opening with riser base pressure of 3.8 bar.

Wavelet-fused richer convolution feature for multiphase flow visual monitoring of oil and gas production processes

“…The wavelet coefficients at the kth scale DkT and DkL from the Tikhonov image and Landweber image are obtained simultaneously by wavelet decomposition. For better decision, a fusion coefficient 1…”

“…Multiphase flow monitoring of the oil and gas production process is of great significance to the safety of oil and gas exploitation and production, and has gradually become an important research issue in the industrial field. At present, the multiphase flow measurement methods mainly include the orifice or Venturi method [1], mass flow method [2,3], ray method [4,5], optical probe method [6,7], electrical method [8], and tomography [9,10]. Electrical capacitance tomography (ECT) is one of the most attractive technologies in the field of multiphase flow measurement due to its advantages of being non-radioactive and non-contact, with good visualization and low cost.…”

Non-intrusive classification of gas-liquid flow regimes in an S-shaped pipeline riser using a Doppler ultrasonic sensor and deep neural networks

“…To allow visual observations of the flow regime, the S-shaped pipeline riser had a transparent section along the vertical riser. To achieve the flow regime desired, the air-water flow rate in the pipeline was controlled automatically using the DeltaV software [44]. A schematic diagram of the S-shaped riser is displayed in Figure 3-1.…”

Development of Gas-Liquid Slug Flow Measurement Using Continuous-Wave Doppler Ultrasound and Bandpass Power Spectral Density

“…The airflow rate was adjusted by controlling the valves to achieve the desired flow regime. More details of the experimental facility can be found in [24,25,35]. The experimental setup is illustrated in Figure 3.…”