Analysis of the Efficiency of the Methods of Intensification Under the Set Conditions

V. Rubel', V. Rubel
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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.
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给定条件下强化方法的效率分析
研究的对象是油井增产工艺,即酸处理。所进行的研究是基于对生产地层(以石灰石为代表)的影响酸,对井产量的增加、含水率的降低、影响的持续时间和额外产量的影响。研究的主要假设是假设增产方法的有效性取决于增产前后井的流量和含水率的变化。这种评估效果的方法可以确定在井底地层区(BFZ)使用一种或另一种冲击的基本可能性和前景。通过回归分析确定地质、物理和工艺因素对增产效果的影响。给出了描述每种考虑的地质和技术因素对井处理效率的定量影响的方程。得到的方程可以在给定条件下选择最佳增产条件,以达到计划的增产效率。研究参数的变化顺序表征了各种类型的影响对BFZ的有效性。然而,这种方法不能确定特定的地质、物理或技术因素对增产效率的定量影响。在对高含水井进行两阶段处理的情况下,整个措施的有效性可能取决于的参数数量增加了几倍。在这种情况下,为了确定一个因素或另一个因素对井处理效率的影响程度,可以通过进行多元统计分析和建立数学模型来确定。研究发现,提高产量和注酸体积、注酸压力对盐酸处理碳酸盐岩起着重要作用。但最重要的作用是含水程度。本文建议采用更复杂的增产措施,在降低含水的同时增加井流量。
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