Abstract
The aim of this paper is to find optimal solutions for flow assurance of oil and gas mixture in an undersea pipeline. This study is applied to 25 km pipeline from the Ca Ngu Vang oilfield to the central processing platform number 3 of the Bach Ho oilfield. From the conservation equations of mass, momentum and energy, together with the theoretical basis of the flow regime, fluid properties, as well as pipeline geometry and properties, two simulations with different flow rates were developed: 1) Slug tracking simulation to predict the formation of slugs: frequency, length and surge volumes. The simulation results helped to find optimal solutions for the reception capability of the slug catcher; 2) Thermal hydraulic simulation to predict the evolution of temperature and pressure in the pipeline in order to help choosing the suitable pour point depressant (PPD) chemicals.
Highlights
Exploration activities in recent years showed that many oilfields in Vietnam have small reserves of about 50-100 million barrels
The optimization of the multiphase transport in this study derived from practical needs for 25 km undersea pipeline connecting Ca Ngu Vang (CNV) oilfield to Central Processing Platform 3 (CPP3) of Bach Ho oilfield (Figure 1)
The simulated results of slug tracking after 24 hours are presented in Figures 4, 5 and 6
Summary
Exploration activities in recent years showed that many oilfields in Vietnam have small reserves of about 50-100 million barrels Development of such small oilfields presents numerous difficulties due to high risks, high investment and operating costs over a unit of recovery. The optimization of the multiphase transport in this study derived from practical needs for 25 km undersea pipeline connecting Ca Ngu Vang (CNV) oilfield to Central Processing Platform 3 (CPP3) of Bach Ho oilfield (Figure 1). With such a long pipeline, the flow is accompanied by high potential risk, for instance the paraffin and hydrate deposit, the formation of slugs, or changes in temperature, pressure and flow rates during the operation of the pipeline. We will study the multiphase flow assurance of an oil-gas mixture in subsea pipeline of 25 km length from CNV oilfield to CPP3 at Bach Ho oilfield
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