Prepared by:Ashutosh GugnaniSuramya Khilnani

DESIGN & OPERATION OF TOPSIDE PROCESSING FACILITIES FOR GAS FIELDS

CONTENTS

TYPES OF GAS FIELD TOPSIDES

DESIGN ENGINEERING FOR TOPSIDES DESIGN OF OFFSHORE PROCESSING FACILITIES FACTORS OF CONSIDERATION FOR DESIGN OF

TOPSIDES PROCESSING FACILITIES PROCESS FLOW

FLOWCHART FOR GAS TREATMENT AND PROCESSING SEQUENCE AND OPERATION

TYPES OF GAS FIELD TOPSIDES

GAS FIELD TOPSIDES

FIXED JACKET (TOPSIDE)

COMPLIANT TOWER(TOPSIDE)

1500 ft 3000 ft

GAS FIELD TOPSIDES

TENSION LEG PLATFORM (TOPSIDE)

SPAR(TOPSIDE)

5000 ft 8000 ft

GAS FIELD TOPSIDES

SEMI SUBMERSIBLE(TOPSIDE)

FLOATING PRODUCTION STORAGE & OFFLOADING VESSEL

10000 ft More than 10000 ft

DESIGN & ENGINEERING FOR TOPSIDES

DESIGN ENGINEERING FOR OFFSHORE PROCESSING FACILITIES FEED phase: It is more critical for determining the feasibility of

specific well area development. An economic analysis on the development of a specific well area is performed based on the outputs of the FEED phase.

Detailed engineering phase: Based on the results of this analysis, the detailed engineering phase is executed if the value of the development is sufficiently large.

In other words, the FEED phase is the basis of the detailed engineering phase and of the feasibility of development on specific well areas.

The final outputs of the FEED phase are: the total costs, the weight, and the layout of an offshore plant. The feasibility of offshore plant projects is determined by these final outputs.

DESIGN OF OFFSHORE PROCESS FACILITIES

DESIGN OF OFFSHORE PROCESSING FACILITIES Design of offshore processing facility consist of two main systems: topside system and a hull system.

Topside systems, which are those that take place on the decks of offshore plants, are used for the production of oil and gas.

Hull systems, which are located on the lower decks of offshore plants, are used for the storage of oil and gas.

The importance of topside systems is far greater than that of hull systems when considering the main function of an offshore platform. Fields of engineering related to topside systems include offshore process engineering, piping engineering, mechanical engineering, instrumentation engineering, electrical engineering, and outfitting engineering

FACTORS OF CONSIDERATION FOR DESIGN OF PROCESSING FACILITIES

DESIGN OF TOPSIDES PROCESSING FACILITIES- Factors of consideration Minimize the effects of possible liquid misdistributionFor the main pieces of equipment, such as a compressor, expander, gas turbine, column, heat exchanger, and separator etc.  LNG storage Design factors to minimize the loss of containment and the effect of sloshing must be carefully studied when considering hull fabrication.   LNG offloadingFeasibility studies have been conducted to establish offshore LNG transfer techniques and appropriate methods associated with side-by-side offloading; tandem offloading and flexible loading arms may be suggested in the near future.

EQUIPMENT LAYOUT & PROCESS FLOW

PROCESS FLOW OF TOPSIDE FOR GAS FIELD

FLOWCHART FOR GAS TREATMENT

FLOW CHART FOR GAS TREATMENT

SEQUENCE & OPERATION

Reservoir

Separator

Stabilizer & Condenser

Dehydrator

Active Gas Extractor

Mercury ExtractorNitrogen

Ext.Demethaniz

er

Fractionator

NGLs to Different Pipe Lines

SEQUENCE & OPERATION FOR GAS TREATMENT AND PROCESSING

Removal of oil, gas & water by Gravity

Action

Stabilization by maintaining RVP &

Solid Content Removal

Removal of water contents

Used for removal of CO2, H2S & Other Sulphur Gases in gaseous form

Used for removal of Mercury in liquid form

Used for removal of Nitrogen in gas form

Used for removal of Methane in gas form

Extraction of different NGLs

Fie

ld

Sp

. Part

Liq

uefa

ction

Part

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