Method for evaluating segmented water production rate of multi-stage tight oil fracturing well by using tracer

Abstract

The invention relates to the related technology in the field of tight oil fracturing fluid backflow tracing, in particular to a method for evaluating the segmented water production rate of a multi-stage tight oil fracturing well by using a tracer. The method comprises the following steps: during the segmented tight oil fracturing process, injecting different types of trace element tracers into each fracturing interval according to the design concentration and amount, continuously monitoring a fracturing process construction curve and acquiring the original formation pressure of each interval,the total amount of the fracturing fluid, and the pump stoping pressure; during the fracturing fluid backflow process, continuously sampling and testing the concentrations of different types of traceelement tracers in the backflow fluid, wellhead backflow fluid production, and wellhead pressure by adopting the "density first and then sparsity" strategy; and according to the monitoring data, drawing concentration curves of different types of tracers with respect to the total fluid volume, selecting the concentration value that can represent the segmented fluid production capacity, calculatingthe formation pressure and bottom hole pressure of each fracturing segment at different time, segmented backflow fluid volume, and the water production rate and water content of formation, and evaluating fracturing effects.

Description

technical field [0001] The invention relates to related technologies in the field of tight oil fracturing fluid flowback tracing, in particular to a method for evaluating staged water production of tight oil multistage fracturing wells by using a tracer. Background technique [0002] At present, with the continuous increase of oil and gas exploration and development, large-scale volume fracturing of horizontal wells has become the most effective technical means for the development of unconventional reservoirs such as tight oil, and the number of fracturing stages of horizontal wells is also increasing year by year. In order to achieve the best fracturing effect, the stage spacing and fracturing construction parameters are optimized. Therefore, it is particularly important to analyze the effect of each fracturing stage after fracturing. [0003] In the existing technology, the effect of staged fracturing can be monitored by cross-well microseismic and electric potential meth...

AI Technical Summary

Problems solved by technology

The actual situation is that each fracturing stage produces formation water to varying degrees, which leads to errors in the evaluation and cannot be reasonably explained

There is no report on segmental formation water production and segmental water cut monitoring using tracer monitoring technology

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