|Publisher||Society of Petroleum Engineers||Language||English|
|Content Type||Conference Paper|
|Title||Suplacu de Barcau Field - a Case History of a Successful In-Situ Combustion Exploitation|
A. Panait-Patică, D. Şerban, and N. Ilie, Petrom S.A.
SPE Europec/EAGE Annual Conference and Exhibition, 12-15 June 2006, Vienna, Austria
|Copyright||2006. Society of Petroleum Engineers|
This paper describes the thermal recovery implementation used on the Suplacu de Barcău field, from the beginning of the production life until 2005. The field is a heavy oil, near surface Pliocene clastic reservoir, situated in the north-western part of Romania, in the Pannonian Depression.
Drilling operations, beginning in 1956, revealed a heavy and viscous oil reservoir. In 1961 a few wells were put into production, as part of an in-situ combustion (ISC) test. Between 1960 and 1970, an important number of wells established the structure and reservoir parameters, from which an original oil in place volume was calculated.
In order to confirm the theoretical model of high efficiency, related to thermal recovery methods, steam drive (SD) and in-situ combustion (ISC) were concurrently tested during the period 1963-1970. The better performance of ISC during this semi-commercial stage led to the decision in 1970 to design the entire reservoir exploitation using this method. The ISC exploitation has been successfully developed and improved in time, becoming the largest of this type in the world and is one of the most important fields exploited by Petrom.
There are now nearly 800 wells with a total production of about 1200 tones/day of crude oil (2005). The cumulative extracted crude in 35 years is about 17,8 million tones, which corresponds to a current recovery factor of 44,6%.
This paper presents the most significant highlights of this field exploitation, including the challenges encountered, the surveillance methods, as well as the important lessons which have been drawn from the exploitation of this field.
Although the Suplac reservoir has very good production parameters, production forecasts for the high density and viscous oil originally indicated that under primary depletion expected recovery would be only 9 %, requiring more than 80 years.
Theoretical and laboratory studies accomplished between 1961 and 1964 led to the conclusion that thermal recovery methods (ISC and SD) could increase oil production and cause a very significant increase in the recovery factor, accompanied by a dramatic decrease in the exploitation period.
Field pilot tests performed during 1964 – 1970 led to the conclusion that both tested methods are commercial.
|File Size||549 KB||10|