engleski

Constant Technology Improvements in Natural Gas Production as the Backbone of Economically Successful and Environmentally Safe Hydrocarbon Production Under the Most Severe Conditions - The Case of Molve Gas Field.

Abstract- The paper briefly describes twenty five years of experience in the application of new knowledge and constant technology improvements in drilling and completion, engineering and construction of gas gathering and treatment systems. In all activities related to hydrocarbon production, very significant emphasis is put on environmental safety, energetic efficiency and production reliability in the most demanding natural conditions of Deep Podravina fields located in northern part of Croatia. The produced fluid from these fields contains sour gases – CO2 in concentrations of 12-55%, H2S between 50-8000 ppm, mercaptans, mercury and chlorides in the formation water. Reservoir depths range from 3200 to 4100 meters and the reservoirs are overpressured up to 50% above the hydrostatic pressure. Besides being overpressured, the reservoirs are characterized by relatively high temperature ranging from 180 to 200 0C . The first gas treatment train of 1 mil m3/day capacity was started up in 1980 and was followed by GTP Molve II expansion with additional 3 mil m3/day capacity, and the final expansion was GTP Molve III with 5 mil m3/day additional capacity in 1993. Plant modifications and redesigns that were carried out in order to optimize the production process, improvement of energetic efficiency and especially environment protection are also presented in the paper. The emphasis is put on the advantages of cogeneration units which are in exploitation and in constant expansion. The cost effectiveness of the cogeneration plant is especially stressed. In the paper it has also been presented how significant energy savings have been achieved by driving the process pumps by variable frequency drives instead of a gas engine drive. The distributed control system (DCS) development and its integration with the business information systems of INA-Naftaplin are briefly presented.

Technology improvements; Natural gas; Improvment and modernizations; Variable frequency drives; Energy savings

Ovaj rad je multidisciplinarni, rudarstvo, strojarstvo, geologija, elektrotehnika i upravljanje.Napisan je na osnovu dugogodišnjih istraživanja, primjena tehnologija i praktičnih rezultata navedenih znanstvenih grana.