Creation of a Mathematical Model for the Injection of Viscoelastic Compositions into a Productive Formation during Well Killing with ALFP

Abstract

The article considers mathematical modeling of injection of various compositions of killing fluid in wells with an ultra-low coefficient of abnormal formation pressure (K a <0.2) to control hydrodynamic processes in the bottom-hole zone of the well and its blocking. This makes it possible to design the process, evaluate the expected parameters of the technological mode of injection of viscoelastic compositions into the productive formation (bottom-hole pressure, fluid flow, duration of the process) and make the necessary adjustments in order to optimize the technological parameters to minimize the negative consequences in the process of well killing operations. The construction of a mathematical model of the blocking process using a three-stage scheme of work is considered. Modeling was carried out on the example of a more complex for the object of research – wells equipped with a packer, followed by extrapolation to structurally simpler objects. Test calculations of the killing fluid flow rate for two types of killing fluid are presented. The technologically optimal option is proposed from the position of minimal contamination of the downhole zone with killing fluids.