A visual experiment method for chemical flooding aided by well pattern adjustment in polymer flooding reservoirs

Abstract

The invention discloses a visualized experiment method of polymer flooding oil deposit well pattern adjustment aiding chemical flooding. Experiment devices used by the method comprises a needle tube pump, a plate sand filling model, a cross connector, separating metering device for fluid products, a support, a microscopic camera and a computer. The method includes connecting the experiment devices, sequentially allowing the plate sand filling model to be subjected to water saturation and oil saturation, starting a camera function, performing oil displacement by water in an original well mode, performing polymer flooding, keeping the original mode or adjusting to a row-shaped well mode, feeding chemical agent slug for subsequent water flooding, and analyzing screenshots of a recorded video. On the basis of plate sand filling model displacement experiments and by the microscopic camera, the visualized oil displacement experiment of polymer flooding oil deposit well pattern adjustment aiding chemical flooding is performed, real-time dynamic evaluation of displacement effect of well adjustment physical simulation and oil displacement systems, high practicality is achieved, and experiment foundation is laid for researchers on further improvement of oil recovery rate after polymer flooding.

Description

technical field [0001] The invention relates to a visualization experiment method in the field of petroleum development, in particular to a visualization experiment method for chemical flooding assisted by polymer flooding reservoir well pattern adjustment. Background technique [0002] Polymer flooding is an tertiary oil recovery technology that effectively enhances oil recovery. However, limited by the mechanism of oil displacement, 40% to 60% of the crude oil remains in the formation after polymer flooding. As a new type of oil displacement method, well pattern adjustment assisted chemical flooding can effectively utilize the remaining oil in the formation after polymer flooding, thereby further enhancing the recovery factor. The simulation of well pattern adjustment assisted chemical flooding in polymer flooding reservoirs with the help of visualized microscopic seepage experiments is helpful to the evaluation of its oil displacement effect and the study of its oil displ...

AI Technical Summary

Problems solved by technology

Tomographic scanning technology can quantitatively count and analyze the oil-water distribution inside the core without damaging the core, but this technology is expensive and cannot visually distinguish different oil displacement systems; the microscopic glass etching model adopts photochemical Etching technology can truly reflect the pore throat structure of the core model, and the displacement process is visible, but the model has low mechanical strength and small size, and cannot perform physical simulation of well pattern adjustment; the flat sand filling model is composed of two perspective The middle of the plate is filled with real core particles with a certain mesh ratio. The application of this model can visually observe the distribution of oil and water during the displacement process. However, the current model is only limited to the application of oil displacement experiments under fixed well pattern mode. , there is no well pattern adjustment simulation experiment method based on the flat sand filling model

At the same time, the injection of various chemical flooding systems in the reservoir after polymer flooding has made it more difficult to simulate chemical flooding assisted by well pattern adjustment.

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