Express assessment of the interaction between the production and injection wells in the Tournaisian-Famennian deposits of Ozernoe field

Abstract

The paper discusses Ozernoe oil field, dedicated to the Solikamsk depression and located in the north of the Perm region. Lithofacies of Ozernoe field are divided into four zones: reef slope, lower back reef, upper back reef and bioherm. Efficiency of the implemented flooding system is evaluated according to the level of interaction between the production and injection wells. The elements of math statistics such as Spearman’s and Kendall’s rank correlation methods are used in order to determine strength and direction of correlation relation between two features. In accordance with these methods, the evaluation of the influence of injection well on production one is carried out based on available field data that include amount of injected and produced water per month for studying wells. Statistical methods based on the calculation of Spearman's and Kendall’s rank correlation are not direct methods of evaluation of hydrodynamic connection between wells. In this regard, it is relevant to assess the reliability of its results using conventional methods such as pressure interference test. Noted that the accuracy of statistical methods of Spearman's and Kendall’s rank correlation while assessing the level of interaction between the injection and production wells confirmed by pressure interference test. The maximum level of interaction was observed between the wells located within the same lithofacial zone allocated by the method of I.S. Putilov. Express assessment of the interaction between the injection and production wells can be performed using statistical methods of Spearman's and Kendall’s rank correlation.

Keywords

• carbonate reservoir
• structurally com­plex deposit
• natural fracture
• fracture opening
• well test
• Spear­man’s rank correlation
• Kendall's rank correlation
• pressure interference test of formation
• lithofacies zones