PECULIARITIES OF METHODOLOGY FOR SELECTING SOLUTIONS OF PRIMARY OPENING OF PRODUCTIVE FORMATIONS BASED ON FILTRATION EXPERIMENTS ON CORE

Abstract

The relevance of the research is caused by the need to form requirements for qualitative selection of process liquids for opening the productive formations in difficult mining and geological conditions related to the drilling of long-term frozen rocks. It is important to carry out experimental studies for evaluating the impact on filtration capacitive properties of core material selected at Polar oil-gas condensate deposit. This direction is relevant due to the need to preserve collector properties of productive formations and productivity of wells during their construction and development. The main aim of the research is to form a list of recommendations for planning and conducting filtration studies on core material when assessing the influence of process liquids on the filtration and capacitive properties of rocks. Objects: core material – sandstone fine-grained, aleuristic with signs of hydrocarbons; selected at Polar oil-gas condensate deposit; solutions of initial opening of various systems – on water and hydrocarbon bases; fresh polymer clay and KCl polymer carbonate drilling fluids. Methods: study of the degree of damage of filtration-capacitive properties of the formation by various process liquids; estimation of values of recovery coefficients of initial permeability of core material taken at Polar oil-gas condensate deposit under different conditions, which are as close as possible to formation conditions by values of formation pressure and temperature. Results. The authors have developed the list of recommendations for planning and conducting filtration studies on the core during selection of process fluids for formation opening. Real examples show the key points of the methodology, in case of non-compliance of which it is possible to obtain an erroneous understanding of conformity or non-conformity of the tested process liquids to the opened objects of operation.

Keywords

• drilling mud
• primary opening
• filtration-capacitive properties
• productive formation
• restoration of permeability
• core material
• efficiency
• filtrate
• depression
• kolmatant