Oil-gas well hot N2 plugging removal technology method and device

Abstract

The invention discloses an oil-gas well hot N2 plugging removal technology method. The method comprises the steps that a plugging removal device is connected to an oil (gas) extraction wellhead through ground pipelines; step 2, an injection pipeline is subjected to pressure test according to the level of the oil (gas) extraction wellhead; step 3, hot nitrogen is injected into a well, dissolved and subjected to pressure release, the hot nitrogen is injected, dissolved and subjected to pressure release again, and the process is repeated for multiple times until plugging is removed. The device comprises a liquid storage tank, the wellhead and a nitrogen production device, an oil tube is connected to the lower portion of the wellhead and sleeved with a sleeve, an inlet / outlet is formed in the side face of the wellhead and communicated with the oil tube, and an inlet / outlet is formed in the side face of the sleeve and communicated with an annular space portion of the oil sleeve. The method has the advantages that the hot nitrogen does not burn or blast, has no chemical corrosivity or pollution and is safe and reliable, the heating temperature can be controlled to 450 DEG C, and the price is low. The method is suitable for plugging removal of obstruction in an immovable string of a well with thick oil, high pour point oil and high wax-bearing oil and a non-circulation channel of a high pressure gas well, and is high in plugging removal efficiency, the nitrogen can escape rapidly, and the plugging materials can be taken out by gas flowback.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to an oil and gas well heat N 2 Blocking removal process method and device. Background technique [0002] In the process of oil and gas field development, along with the production of oil and gas wells, wax deposits and hydrates are often blocked in the production string. Once blockages are formed in heavy oil wells, production will be affected, resulting in a significant drop in fluid production or even no fluid production. . The current common practice is to use partial hot water solution circulation to wash the well, hot oil to dilute and other methods, and the effect is not satisfactory. Once the hot water circulation is used for the low pressure well of the gas well, the well will usually be crushed to death, especially for the blocked one. These methods will fail in wells where the pipe string and gas well kill are sensitive. Contents of the inventio...

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Problems solved by technology

The current common practice is to use partial hot water solution circulation to wash the well, hot oil to dilute and other methods, and the effect is not satisfactory. Once the hot water circulation is used for the low pressure well of the gas well, the well will usually be crushed to death, especially for the blocked one. These methods will fail in wells where the pipe string and gas well kill are sensitive

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