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Research article
Modern Trends in Hydrocarbon Resources Development

Technique for calculating technological parameters of non-Newtonian liquids injection into oil well during workover

Authors:
Dmitry V. Mardashov1
Аnton V. Bondarenko2
Inzir R. Raupov3
Date submitted:
2021-09-17
Date accepted:
2022-04-06
Date published:
2022-12-29

Abstract

Technique for automated calculation of technological parameters for non-Newtonian liquids injection into a well during workover is presented. At the first stage the algorithm processes initial flow or viscosity curve in order to determine rheological parameters and coefficients included in equations of rheological models of non-Newtonian fluids. At the second stage, based on data from the previous stage, the program calculates well design and pump operation modes, permissible values of liquid flow rate and viscosity, to prevent possible hydraulic fracturing. Based on the results of calculations and dependencies, a decision is made on the necessity of changing the technological parameters of non-Newtonian liquid injection and/or its composition (components content, chemical base) in order to prevent the violation of the technological operation, such as unintentional formation of fractures due to hydraulic fracturing. Fracturing can lead to catastrophic absorptions and, consequently, to increased consumption of technological liquids pumped into the well during workover. Furthermore, there is an increased risk of uncontrolled gas breakthrough through highly conductive channels.

Keywords:
mathematical modelling calculation algorithms well killing well workover polymer composition rheological investigations technological parameters critical viscosity hydraulic fracturing pressure
10.31897/PMI.2022.16
Go to volume 258

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