Article

Petroleum Science

, Volume 8, Issue 1, pp 70-78

Classification of carbonate gas condensate reservoirs using well test and production data analyses

  • Yong LiAffiliated withResearch Institute of Petroleum Exploration and Development, PetroChina Email author 
  • , Baozhu LiAffiliated withResearch Institute of Petroleum Exploration and Development, PetroChina
  • , Yongle HuAffiliated withResearch Institute of Petroleum Exploration and Development, PetroChina
  • , Jing XiaAffiliated withResearch Institute of Petroleum Exploration and Development, PetroChina
  • , Zhaowei LiuAffiliated withChina National Oil & Gas Exploration and Development Corporation, PetroChina
  • , Xingliang DengAffiliated withTarim Oilfield Company, PetroChina
  • , Zhicheng SheAffiliated withTarim Oilfield Company, PetroChina
  • , Kun FanAffiliated withTarim Oilfield Company, PetroChina

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Abstract

Carbonate reservoir patterns play an important role in the production performance of oil and gas wells, and it is usually classified through static data analysis which cannot reflect the actual well performance. This paper takes the Tazhong No. 1 gas field in the Tarim Basin, China as an example to investigate the classification of carbonate reservoirs. The classification method mainly combines well test analysis with production analysis — especially the Blasingame type curve method. Based on the characteristics of type curves for well test analysis and the Blasingame method, the relationship between the type curves and reservoir pattern was established. More than 20 wells were analyzed and the reservoirs were classified into 3 major patterns with 7 sub-classes. Furthermore, the classification results were validated by dynamic performance analysis of wells in the Tazhong No.1 gas field. On the basis of the classification results, well stimulation (i.e. water flooding in a single well) was carried out in three volatile-oil wells, and the oil recovery increased by up to 20%.

Key words

Carbonate reservoir pattern well test analysis production analysis type curve