Ημερολόγιο Εκδηλώσεων

Περιγραφή:
ΠΟΛΥΤΕΧΝΕΙΟ ΚΡΗΤΗΣ Σχολή Μηχανικών Ορυκτών Πόρων Εξεταζόμενος μεταπτυχιακός φοιτητής: Κλωθάκης Ανδρέας Θέμα Μεταπτυχιακής Εργασίας: «Basic design of oil process train in upstream facilities» Τριμελής Εξεταστική Επιτροπή: Καθ. Βαρότσης Νικόλαος (επιβλέπων) Καθ. Καλογεράκης Νικόλαος Καθ. Πασαδάκης Νικόλαος Περίληψη The term “surface or production facilities” for an oilfield includes the necessary equipment for processing the production fluids from the wells into commodities. The core part of this process is the separation of the wellhead fluids into three distinct fluid phases namely, oil, water and gas. The separation train may consist of a single primary separation vessel or multi-stage separation vessels, each one operating at different conditions. The performance of the separation process is defined by the percentage of oil that is extracted from the wellhead fluids, as well as from the properties of the produced oil and gas with respect to the market specifications (RVP, BSW, H2S, water content, etc.). As the production of an oilfield changes with time, production wells are closed while new wells start producing, the separation conditions should adapt in order to achieve maximum performance at any given time. There are often cases in which surface separation facilities impose constraints on the production processes or they interfere with the total oil production output. The best way to avoid such constraints is through simulation of the upstream production facilities, including sensitivity and performance analysis. This study examines the design and performance of a three-stage separation process at steady state conditions. The input flow to this process is the composite product of three wellhead fluids, each one with different hydrocarbon properties and watercuts. Using AspenTech’s HYSYS simulation software, together with literature data and equipment standards, we manage to simulate the basic process flow diagram and test its performance over different numbers of separation stages for a predefined set of inflow conditions and flowrates. Temperature and pressure conditions at each separation stage were optimized according to the produced oil volumetric flowrate, under different production schemes – all wells producing simultaneously, one out of three wells shut in, start/end of production life for each well, etc. Equipment specification and sizing is also a part of this study. Separator vessel sizing and internal configuration were prerequisites in order to monitor and control water carry over between the separation stages and the water content of the final stock tank oil. A short review on recent literature data for carry over estimation and technical information about separator internals are provided. HYSYS correlation tools were again employed to perform the water carry over calculations, to define the droplet size distribution in each separator and to design the internal configuration of each vessel. Calculation of the gas compressor sizes and specifications were included – as input data - in the optimization process.