A device and method for studying the plugging law of oil well cement sheath channeling

Abstract

The present invention relates to a device and method for studying the plugging law of oil well cement ring channeling, wherein the device for studying the plugging rule of oil well cement ring channeling includes a plugging agent injection device, an oil well model, multiple groups of bismuth-lead-tin alloy sheets, steel column; the intermediate container of the plugging agent injection device is connected to the oil well model, and the perforations of the oil well model are respectively connected to a core with different permeability; The shaft is screwed between the top cover and the base, and the steel column is used to seal the perforation; multiple sets of bismuth-lead-tin alloy sheets with a width of 25mm, and one group is multiple bismuth-lead-tin alloys with the same thickness, the same length, and different bending shapes one group of bismuth-lead-tin alloy sheets with the same length, same shape, and different thickness; one group of bismuth-lead-tin alloy sheets with the same thickness, same shape, and different length. The invention can observe the gelation status of various plugging agents in cracks of various shapes, and the migration rule of the plugging agents in the rock core and cement sheath in the pore space.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a device and method for studying the plugging rule of oil well cement sheath channels. Background technique [0002] In crude oil extraction operations, oil wells produce water, which has a great impact on economic benefits, and may even cause some high-yield oil wells to be transformed into oil wells with no industrial value. If measures are not taken in time for the water output from the oil well, dead oil areas of water traps may appear in the formation, and the injected water will bypass, thereby reducing the recovery rate and causing great waste. The water outflow from the oil well may also damage the reservoir structure and cause sand production in the oil well; the water outflow from the oil well will also increase the relative density of the liquid, increase the oil pressure at the bottom of the well, and turn the gushing well into a pumping well; in ad...

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Problems solved by technology

[0005] An object of the present invention is to provide a device for studying the plugging laws of oil well cement ring channeling. This method is used to solve the problem that the current water plugging of oil wells cannot consider the nature of underground channeling. Another object of the present invention is to provide this The method of experimental research on the device for studying the plugging law of oil well cement ring channeling

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