Method for blocking bottom water coning

Abstract

The invention discloses a method for blocking bottom water coning. An original perforation segment is firstly blocked, then perforation is carried out on the upper portion of an original oil-water interface, a blocking agent is injected into a perforated hole, the injection pressure is controlled, so that the blocking agent enters the stratum deeply to the largest extent by adopting radial flowingas the main manner and longitudinal flowing as the auxiliary manner, the blocking area is enlarged as much as possible, and a channel of bottom water coning is thoroughly blocked by the source for blocking bottom water; and meanwhile, an oil-water layer is prevented from being blocked, then perforation is carried out on the original perforation segment again to achieve production, the success rate of bottom water coning blocking is improved to a large degree, and an oil-gas well of the this kind can restore oil-gas production capacity.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a method for blocking bottom water coning. Background technique [0002] Oil and gas reservoirs with bottom water are characterized by obvious oil-water and gas-water interfaces without any barriers. Oil and gas wells in this type of reservoir are unreasonably selected for production, or because oil and gas wells produce at a rate greater than their critical output, resulting in coning of bottom water, rapid rise of water cut in oil and gas wells, and violent water flooding of oil and gas wells in a short period of time ( figure 2 ), seriously affecting the production effect of oil and water wells. [0003] At present, blocking bottom water coning is considered a challenging problem in the industry. The commonly used method is to squeeze chemical plugging agent into the original perforation section of oil and gas wells to block bottom water coning, but the efficiency is l...

AI Technical Summary

Problems solved by technology

Oil and gas wells in this type of reservoir are unreasonably selected for production, or because oil and gas wells produce at a rate greater than their critical output, resulting in coning of bottom water, rapid rise of water cut in oil and gas wells, and violent water flooding of oil and gas wells in a short period of time ( figure 2 ), which seriously affects the production effect of oil and water wells

[0003] At present, blocking bottom water coning is considered a challenging problem in the industry. The commonly used method is to squeeze chemical plugging agent into the original perforation section of oil and gas wells to block bottom water coning, but the efficiency is low. At the same time, There is a risk that all the perforation sections of the oil and gas well will be blocked, resulting in the loss of production capacity of the oil and gas well; secondly, the plugging range is limited and the validity period is very short

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