Method and system for determining medicament injection rate for fracture-vug type oil reservoir partition plate bottom water control

Abstract

The invention discloses a method for determining the medicament injection rate fracture-vug type oil reservoir partition plate bottom water control. The method comprises the following steps: determining the thickness of a partition plate according to the production pressure difference of a current production well and the water drive strength after a partition plate medicament is gelatinized; monitoring the position of an oil-water interface, and determining the radius of a circular bottom water control partition plate formed by the partition plate medicament at the position of the interface and limited by a current production well oil reservoir body; determining the effective thickness of the partition plate formed after the partition plate medicament is gelatinized in oil-water under a preset temperature threshold value of a high-temperature deep well reservoir through an indoor experiment, and obtaining a loss coefficient representing the loss degree of the partition plate medicament from injection to formation of the bottom water control partition plate; and obtaining the partition plate medicament injection rate according to the thickness, radius and loss coefficient of the partition plate. According to the method, the ineffectiveness caused by insufficient injection rate is overcome, the phenomenon of complete blockage caused by too much injection rate is also avoided, the oil increasing effect of an oil well is obvious, and the recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a method and a system for determining the injection amount of a medicament used for controlling bottom water in a fracture-cavity reservoir. Background technique [0002] Bottom water coning is an important reason for reducing single well production and recovery in bottom water reservoirs. For fractured-vuggy bottom water reservoirs, there is a big difference between the reservoirs and the porous and fractured reservoirs. Pores, fractures and caves coexist in the reservoirs, and the large paleo-karst cave system is the main storage space. The reservoir scale varies greatly in space, and the distribution of reservoir space is discontinuous. When oil and gas wells are put into production, water cones are prone to occur inside oil and gas layers due to the influence of oil, water or gas and water gravity difference. As the rate of oil and gas production increases,...

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Problems solved by technology

[0004] The diaphragms in the existing diaphragm bottom water control technology are mainly aimed at sandstone oil and gas reservoirs. Due to the complex structure of fractures and caves in fractured-vuggy reservoirs, it is impossible to judge the law of water discharge and the oil-water interface. Therefore, the existing diaphragm parameter design methods cannot Satisfies the water control requirements of fractured-vuggy reservoirs

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