Abstract

What are the formations production limits? What are the technical limits that define the operating envelope of Wells, pipelines, and facilities of existing and those that are under construction? Are these limits defined on steady state only? Also, what about transient? How can the system be operated efficiently?

To answer these questions, an integrated study was made to cover all the aspects mentioned in the previous questions, and to determine the operating envelope in both steady state and transient of all the elements (Wells, pipelines, slug catcher, etc.) of FieldAB gas and condensate production system. This system is located on a remote location in the Peruvian Jungle.

This study was performed in three stages. The first stage implied to make Well models of the existing producers and match the output with the results obtained during Well testing at initial conditions. On the second stage, surface production facilities were added (manifold, flowlines and slug catcher)to make an integrated model. This model output was matched with initial conditions (production startup) and the conditions after two and half years of production. Finally, on the third stage, the under-construction installations models were added with information from EPC contractor.These models include: Three new producers and associated surface facilities, two new pipelines and a slug catcher (compression station entry). All the previously mentioned models were built in OLGA.

Once the integrated model was made, a methodology was developed to determine the technical limits of each element of the production system.The parameters that will to be described are part but not all the parameters evaluated. For each Well the followingswere evaluated: Liquid Loading, Maximum Production Rate (Erosional Velocity), and Maximum Opening Speed depending on the liquid content of each Well to avoid slugs that could not be handled by the slug catcher. For each pipeline, the Maximum Production Rate to avoid Erosional Velocity, and Minimum Rate to avoid instability, were evaluated.

Results give flexibility to operators to know between which limits they can operate the production system elements in transient and steady state, and on what parameters they must be focused on while making a maneuver or on normal production.

Integration is the keyword of this project. A production system must be analyzed as a whole, not only analyzing the behavior of the elements individually. This study offers an integrated view point of how to define operating envelopes and operating procedures that have the potential to optimize an asset production and improve the system elements life.

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