A technology for increasing injection of water injection wells

Abstract

The invention provides an injection increasing process of a water injection well. The injection increasing process comprises the following steps of: (1) assembling an underground tool set; (2) mounting the underground tool set at the bottom end of an oil pipe and then enabling the underground tool set to enter a set layer position of a sleeve of a water injection well; (3) mounting a milling tool set at the bottom end of a continuous oil pipe and enabling the milling tool set to enter the oil pipe and then enter a whipstock so that the milling tool set is provided with a hole in the sleeve; (4) after the hole is formed, taking out the milling tool set; and (5) mounting a spraying tool at the bottom end of the continuous oil pipe and then enabling the spraying tool to enter the oil pipe to reach the formed hole of the sleeve; and enabling the spraying tool to enter a stratum to form a radial hole channel by utilizing hydraulic jet of the spraying tool. The injection increasing process of the water injection well shortens the distance between an oil well and a well in a hole drilling direction through radial drilling so as to establish an effective production pressure difference between the well and the corresponding oil well; and injected water can effectively drive oil gas in the stratum to flow to an oil production well, so that effective oil injection is realized and the oil recovery rate is improved.

Description

technical field [0001] The invention relates to the technical field of water injection oil and gas field development, and more specifically relates to a technique for increasing injection of water injection wells. Background technique [0002] Water injection is the most economical and effective method to replenish formation energy, improve oil displacement efficiency, and stabilize oil well production capacity during oil and gas development. [0003] At present, the water injection development of oil and gas fields mainly uses water injection wells to perform water injection after conventional perforation at the reservoir position. The above-mentioned conventional perforation uses explosives to penetrate the casing into the formation in the well, and the effective range is less than 1m. Due to the short distance of conventional perforation, affected by the heterogeneity of the plane and section of reservoir physical properties, after the injected water enters the formation...

AI Technical Summary

Problems solved by technology

The above-mentioned conventional perforation uses explosives to penetrate the casing into the formation in the well, and the effective range is less than 1m

Due to the short distance of conventional perforation, affected by the heterogeneity of the plane and section of reservoir physical properties, after the injected water enters the formation, it chooses to advance in the high-permeability direction or strip on the plane and section, which may easily cause oil wells in the high-permeability direction or high-permeability Strip water flooding, while oil wells in the direction of medium and low permeability or medium and low permeability layers have poor water injection effect and low degree of water flooding; it is difficult to ensure the production pressure difference between water wells and corresponding oil wells, which affects the influence of water injection formations on oil and gas flow to production wells drive, low oil and gas recovery

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