Abstract
In recent years, as the polymer drive of the main class I oil reservoir has been transferred to the subsequent water drive development, the class II oil reservoir has gradually become the main target of the three times oil recovery development, compared with the class I oil reservoir, the class II oil reservoir has the characteristics of relatively poor oil reservoir development and strong non-homogeneity. With the effect of the second-class oil layer successively, the fracturing target is mainly the second-class oil layer, but the fracturing effect becomes worse year by year, and it is difficult to produce in the next step. Therefore, it is important to optimize well selection for fracturing. In this paper, we analyze the effect of fracturing wells in Class II reservoirs in recent years and summarize the factors affecting the effect of fracturing in Class II reservoirs and the practices to ensure the effect of fracturing in Class II reservoirs, so as to provide a reference basis for the selection of wells for Class II fracturing in the future, which is of certain significance.
Highlights
Extraction well fracturing as one of the main production tools for oilfield development, the second-class oil layer has entered the peak of effectiveness one after another and has become the main fracturing target
Based on the fracturing results of Class II reservoirs in previous years, the experience is summarized in terms of "factors affecting the fracturing effect of recovery wells" and "practices to ensure the fracturing effect of recovery wells"
The analysis concluded that the effect of fracturing on the oil increase in the recovery well is mainly related to factors such as "the remaining oil in the fractured well, the degree of control, the timing of fracturing, and the injection status of the well area"
Summary
Extraction well fracturing as one of the main production tools for oilfield development, the second-class oil layer has entered the peak of effectiveness one after another and has become the main fracturing target. The oil recovery rate is rising, but the fracturing effect is getting worse year by year, and it is difficult to go up to production since 2005. The oil recovery rate has been rising, but the fracturing effect has become worse year by year, making the step to production difficult. 2018, through optimizing the fracturing selection, the average single well fracturing of the extraction wells increased oil by more than 6t per day. Based on the analysis of the fracturing oil increase effect, the proportion of "high efficiency wells" can be effectively increased by optimizing the well selection conditions and implementing measures to ensure the fracturing effect
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