Development and research of new technological liquid for raising efficiency of a layer secondary opening
Development of perfect hydrodynamic contact between a well and a productive slayer without any detrimental effect on collector properties of a formation bottomhole zone, without any considerable deformations of drill-pipe casing strings and a cement cover is the main objective of the secondary opening. In case of secondary opening of a productive layer perforation liquid can penetrate deeply into a layer, exceeding the depth of penetration of drilling and cement mud filtrates. The quality of perforation media exerts a big impact on preservation of a layer collecor properties in conditions of abnormally high and low formation pressure. New compositions of perforation liquids, including muds of various electrolytes for density regulation of that or other liquid and surfactants to decrease surface tension are developed. Series of experimental studies were carried out to provide assessment of efficient influence of new technological liquids on rock core samples, selected from various offshore fields of the Azerbaijan Republic (in particular, Gyuneshli and Neft Dashlary). The developed new technological liquids with surfactants for secondary opening of productive horizons are recommended for usage when exploring Azerbaijan both on-land and offshore fields in abnormal thermobaric conditions.