METHOD AND KEY STAGES OF SIDETRACKING AND DRILLING A SECOND WELL

Abstract

As the experience of other countries shows, the restoration of an idle well stock allows to increase hydrocarbon recovery at oil fields and increase oil and gas production. In the absence of technical and technological methods and means to perform workovers (bypassing contaminated reservoir zones or mechanical obstacles in the string), sidetracks are drilled, thus saving material and financial resources. The method of drilling a new wellbore through a cut "window" in the casing (production) string allows to restore even those wells that cannot be repaired in any other way or are economically unfeasible. Sidetracking and drilling of a second wellbore is a method of rehabilitation of wells that are technically impossible or economically unfeasible to repair using known methods. This method makes it possible to replenish the existing well stock, improve the development of deposits to replenish the development grid account by transferring wells from the upper horizons, increase current oil recovery, and reduce the time to recover residual oil reserves. In addition, this method allows to restore wells in areas where drilling new wells is difficult or unprofitable due to the conditions and state of reservoir development.