This document discusses the design and operation of topside processing facilities for gas fields. It begins by describing different types of gas field topsides, including fixed jacket platforms, compliant towers, tension leg platforms, spars, semi-submersibles, and floating production storage and offloading vessels. It then covers the design engineering process for topsides, including the FEED and detailed engineering phases. Finally, it discusses factors to consider in the design of offshore processing facilities, such as minimizing liquid misdistribution and designing for LNG storage and offloading.

1. Prepared by:
Ashutosh Gugnani
Suramya Khilnani
DESIGN & OPERATION OF TOPSIDE
PROCESSING FACILITIES FOR GAS FIELDS

2. 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

3. TYPES OF GAS FIELD TOPSIDES

4. GAS FIELD TOPSIDES
FIXED JACKET (TOPSIDE) COMPLIANT TOWER
(TOPSIDE)
1500 ft 3000 ft

5. GAS FIELD TOPSIDES
TENSION LEG PLATFORM
(TOPSIDE)
SPAR
(TOPSIDE)
5000 ft 8000 ft

6. GAS FIELD TOPSIDES
SEMI SUBMERSIBLE
(TOPSIDE)
FLOATING PRODUCTION
STORAGE & OFFLOADING
VESSEL
10000 ft More than 10000 ft

7. DESIGN & ENGINEERING FOR
TOPSIDES

8. 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.

9. DESIGN OF OFFSHORE PROCESS
FACILITIES

10. 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

11. FACTORS OF CONSIDERATION FOR
DESIGN OF PROCESSING FACILITIES

12. DESIGN OF TOPSIDES PROCESSING
FACILITIES- Factors of consideration
Minimize the effects of possible liquid misdistribution
For 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 offloading
Feasibility 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.

13. EQUIPMENT LAYOUT & PROCESS
FLOW

14. PROCESS FLOW OF TOPSIDE FOR GAS FIELD

15. FLOWCHART FOR GAS
TREATMENT

16. FLOW CHART FOR GAS TREATMENT

17. SEQUENCE & OPERATION

18. 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
FieldSp.
Part
LiquefactionPart

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