Abstract
The object of research is the well stimulation processes, namely acid treatments. The studies carried out are based on the influential acids on the productive formation, which is represented by limestone, on an increase in well production, a decrease in water cut, the duration of the effect, and additional production. The main hypothesis of research is the assumption that the effectiveness of stimulation methods is determined by the change in flow rates and water cut of wells before and after the treatments. This method of evaluating the effectiveness allows to determine the fundamental possibility and prospects of using one or another type of impact on the bottomhole formation zone (BFZ). Regression analysis to identify the influence of geological, physical and technological factors on the efficiency of stimulation in wells is considered. Equations are shown that describe the quantitative influence of each of the considered geological and technological factors on the efficiency of well treatments. The obtained equations make it possible to select the optimal conditions for well stimulation for the given conditions in order to achieve the planned efficiency. The sequence of changes in the studied parameters characterizes the effectiveness of various types of impact on the BFZ. However, this method does not allow determining the quantitative effect of a specific geological-physical or technological factor on the efficiency of well stimulation. In the case of two-stage treatments on high-water-cut wells, the number of parameters on which the effectiveness of the entire measure may depend, increases several times. In this case, in order to identify the degree of influence of one factor or another on the efficiency of well treatment, it is possible to determine after carrying out multivariate statistical analysis and building mathematical models. It was found that both the increase in production rate and the volume and pressure of acid injection play an important role in the treatment of carbonate rocks with hydrochloric acid. But the most important role is played by the degree of water cut. In this paper it was suggested to use a more complex stimulation method, which will simultaneously reduce the water cut and increase the well flow rate.
Highlights
One of the urgent problems in the oil and gas industry is to improve the efficiency of well operation and increase fluid production
Specific mining and geological conditions of occurrence of productive strata leave a significant imprint on the technological features of well operation, as well as the fact that the increase in water cut increases over time [1, 2]
In order to identify the degree of influence of one factor or another on the efficiency of clay-acid treatment (CAT) wells, it can be determined after conducting multivariate statistical analysis and building mathematical models [7, 8]
Summary
One of the urgent problems in the oil and gas industry is to improve the efficiency of well operation and increase fluid production. The use of traditional methods of stimulation is not always justified, because, firstly, it can cause irreversible changes in the productive reservoir. This leads to irreplaceable losses of hydrocarbons. A serious negative impact on the environment of the ecosystem [3, 4]. Having analyzed all these factors, set to solve such urgent tasks:. – to perform geological and industrial analysis of the field development and systematize the results of the application of technologies for intensifying fluid production; – to experimentally substantiate new acidic compositions of reagents to increase hydrocarbon production. The aim of research is to determine if the chemical composition of acids will better affect the carbonate reservoir rock in difficult geological conditions
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