A method for water control and production enhancement of high water cut oil wells in low permeability bottom water reservoirs

Abstract

The invention belongs to the technical field of oil well water plugging and fracturing stimulation used in oil production, and particularly relates to a water control and stimulation method for a high-water-cut oil-producing well in low permeability bottom water reservoir. The method comprises the steps that a nanometer composite high-strength plugging agent and water are mixed according to the mass ratio of (4-7):5; under the condition of 0-90 DEG C, a mixture is injected into the stratum to plug water outlet positions and cracks; the nanometer composite high-strength plugging agent enters anoil well reservoir through balanced displacement by using clear water; well shutdown and waiting on cement setting are carried out; drafting process is carried out to the shaft bottom; pressure-testing is carried out by a cementing truck; radial hydraulic jet fracturing is carried out at the top of a reservoir sand body; and well opening is carried out for pumping and putting into production. Thewater control and stimulation method solves the problem that a high water-cut well cannot be blocked or the difficulty of stimulation is high after being blocked due to the fact that a plugging agentis low in strength or prone to being shrunk after curing, and has low cementing strength with the stratum in a conventional water plugging technology, and a new way for the water control and stimulation technology of the high-water-cut oil-producing well in the low permeability bottom water reservoir is opened up.

Description

technical field [0001] The invention belongs to the technical field of oil well water plugging and fracturing production increase used in petroleum exploitation, and in particular relates to a method for controlling water and increasing production of an oil well with high water content in a low-permeability bottom water reservoir. Background technique [0002] In the development process of low-permeability bottom water reservoirs, due to the influence of formation fractures and heterogeneity, coupled with fracturing and putting into production, it is very easy to cause the bottom water to be communicated after the oil well measures, the water cut rises greatly, and the water cut is high. It seriously affects the production capacity of the oil well and the long-term stable production of the oil field. The current conventional water control and plugging technology can no longer meet the needs of this type of reservoir for water control and production increase. Bottom water re...

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to overcome the problem that the chemical water plugging of conventional oil wells in low-permeability bottom water reservoirs is mainly polymer plugging agents, while high-water-cut wells in low-permeability bottom water reservoirs often have high water output strength and high wellhead pressure, resulting in polymer plugging. The strength of the plugging agent is difficult to meet the plugging requirements; the second purpose is to overcome low-permeability bottom water reservoirs. Under the existing technology, the poor injectivity of high-strength plugging agents such as cement is likely to cause damage to the reservoir near the wellbore and after solidification Easy to shrink, low bonding strength with the formation, can not be plugged for high water-cut wells or difficult to increase production after plugging