Method for removing blockage of oil-water well through magnetic positioning pulse acidification

Abstract

The invention discloses a method for removing the blockage of an oil-water well through magnetic positioning pulse acidification, which is used for acidifying an oil well in an oil field. The method comprises the following steps of: clearing and reshaping a mine shaft with a drift size gauge, washing the mine shaft with active water, and substituting acidizing fluid for the active water in an oil pipe until the active water reaches the middle part of an oil layer; and lifting an oil outlet pipe, loading in a high-power pulse processing device, magnetically positioning a perforation interval of required measurement, checking data, starting the device to process, lifting the device to an interval needing to be processed to process again after meeting a design requirement, taking out the high-power pulse processing device after processing, loading a pump and completing the well after discharging liquid from a production well, and completing the well after loading a production oil pipe into a water injection well to backwash the water injection well. The method has the advantages that: the high-power pulse processing device can precisely position the perforation interval of the oil-water well; and after processing with the acidizing fluid during pulse processing, the processing radius and the processing efficiency of the acidizing fluid can be effectively guaranteed and blocking substances in ducts can be more effectively corroded.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to oil well acidification and blocking removal construction, and is a method for positioning and removing plugs in oil-water well reservoirs in oil fields. Background technique [0002] At present, with the continuous development of oilfields, production well reservoirs will be clogged to varying degrees due to various reasons. Conventional plugging removal methods include acidification, deflagration fracturing, fracturing, etc. However, deflagration fracturing and fracturing have a relatively large impact on the reservoir. First, it is easy to cause artificial fractures to communicate with natural fractures and cause water channeling. Rapid water breakthrough in oil production wells; second, the stimulation action point cannot be accurately controlled, and it is difficult to achieve selective or uniform plugging removal, which is more difficult for profile stimul...

AI Technical Summary

Problems solved by technology

Conventional plugging removal methods include acidification, deflagration fracturing, fracturing, etc., but deflagration fracturing and fracturing have a relatively large impact on the reservoir. First, it is easy to cause artificial fractures to communicate with natural fractures and cause water channeling. Rapid water breakthrough in oil production wells; second, the stimulation action point cannot be accurately controlled, and it is difficult to achieve selective or uniform plugging removal, which is difficult for profile stimulation

The treatment radius of the acidizing operation is limited, and it is difficult for the acid liquid to go deep into the formation to remove the deep clogging of the reservoir

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