Flow assurance is an engineering process provides comprehensive analysis to assure hydrocarbon fluids are transported through pipelines (small lines or trunk lines) in an economical and safe manner from the producing wells to the treatment plant. Thus, flow assurance covers the whole range of possible flow problems that can trigger in pipelines such as hydrate formation, erosion, and severe slugging or back pressure to the old producing wells if they are connected to the same network. This paper introduces a case study done on a new gas field named "Denise-B?? located in the Mediterranean Sea, Egypt.This field is planned to be on production after finishing drilling and completion phases of three wells (Denise-4, Denise-5 and Denise-S4). The main scope is to optimize the whole network to select the best development rates of the new field without any back out from the old producing ones. At the same time, overcoming any flow problems like hydrate formation since offshore wells and offshore transmission lines may be operating under conditions where hydrate formation is favorable. The paper highlights that the change of inhibitor from di-ethylene to mono-ethylene glycol has a significant impact on the required injection rates. It is found that using mono-ethylene glycol compared to di-ethylene glycol can save up to 45% of the required volume rate to lower the hydrate temperature with 5 0C margin with flowing gas temperature. This is also is linked to properly design the injection pump capacity. Hence; it enhances the confidence and supports the decision to use mono glycol as hydrate inhibitor at low injection rates in offshore gathering networks while reducing the operating costs.

Introduction

Some of the most severe production-operation hazards are risks associated with the transportation of fluids. When condensate, water, and gas simultaneously flow in a well or pipeline, a number of potential problems can arise. These problems can be related to flow instability, erosion, and solids formation (like hydrates) and can lead to serious risk of leakages or blockages. The pipeline simulation tools can be used to simulate the steady state of the gathering network that collects the production of fluids from different gas or oil fields. Thus; it can provide a quick but efficient view of the system highlighting its criticalities that require more attention from operational point of view.

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