Comparative Laboratory Tests of Products for Selective Control of Water in Gas Wells

• Published in: Gospodarka surowcami mineralnymi Vol. 30; no. 3; p. 111
• Main Authors: Falkowicz, Slawomir, Dubiel, Stanislaw, Cicha-Szot, Renata
• Format: Journal Article
• Language: English
• Published: Warsaw Polish Academy of Sciences 01.07.2014
• Subjects: Mineral resources; Natural gas industry; Natural gas reserves; Oil & gas well completion; Product testing; Studies; Poland
• ISSN: 0860-0953; 2299-2324
• DOI: 10.2478/gospo-2014-0022

This paper presents selection procedures and technological efficiency evaluation of chemical agents applied for the selective water shut-off treatments in gas production wells. This treatments exploit the phenomenon of selective modification of rock permeability to water without impairing that to gas by injection into a producing well water soluble chemicals (Relative Permeability Modifiers - RPM), mainly polymers, alkaline and surfactants. During last years, there have been several RPM treatments performed in the reservoirs with distinct geological and exploitation parameters which effects were characterized based on literature data. Taking into consideration previous experiences, analysis of exploitation data of several wells for RPM treatment application was performed. Fundamental importance during well selection have the way of determination of water flow (coning or layer) to well. That evaluation was performed using the method of graphical analysis of changes in the first order derivative of water-gas ratio from exploitation time of gas reservoir by particular well. The shape of the curve presented in log-log scale form the basis of distinction the nature of water flow to gas well and selection RPM treatment technology. Based on the data provided by manufacturers four commercial RPM agents were chosen and tested in the laboratory under simulated downhole reservoir conditions. Conducting tests specific properties of available on the market RPM agents (polymer or microgels), various mechanism of relative permeability reduction of collector rock for formation water and Carpathian foothills gas wells exploitation characteristics were taking into consideration. Furthermore, this study outlines analysis of the technological parameters selection based on calculation which allows to compare the value of pressure drop needed to overcome the hydraulic resistance of flow two RPM agents with different dynamic viscosity coefficients by the injection line with various diameter and depending on flow rate.