Producing well sleeve interior anti-corrosion method
A technology for internal anti-corrosion and oil production wells, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of high labor cost, large amount of corrosion inhibitor, high cost, etc., and achieve the goal of improving anti-corrosion effect, reducing consumption and personnel cost Effect
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Example Embodiment
[0022] Example 1:
[0023] In order to overcome the defects of the existing anti-corrosion technology, this embodiment provides a method for anti-corrosion inside the casing of an oil production well. The oil-water mixture in the annular space between the casing 2 and the oil pipe 1 becomes a dead volume and increases the oil-water ratio. The oil-water mixture in the annular space between the casing 2 and the oil pipe 1 is filled with a corrosion inhibitor.
[0024] Principle of the present invention:
[0025] When the pump hanging tail pipe is extended, the liquid from the dynamic liquid level to the pump hanging tail pipe oil casing annulus will be a dead volume. Due to the different density of oil and water in the produced fluid, under the action of gravity, oil and water separation will gradually occur, and crude oil will occupy the In the upper space, the produced water moves downward, and finally the dead volume from the dynamic liquid level to the liner casing annulus ...
Example Embodiment
[0028] Example 2:
[0029] On the basis of Embodiment 1, this embodiment provides a figure 1 In the anticorrosion method in the casing of the oil production well shown, after the oil-water mixture becomes a dead volume, the crude oil in the oil-water mixture under the liner of the pump moves upward, and the water in the dead volume part moves downward to realize the oil-water ratio of the dead volume part. increase.
[0030] In this embodiment, the pump hanging tail pipe is a metal oil pipe 1 , and a sacrificial anode 4 is attached to the metal oil pipe 1 .
[0031] like figure 1 As shown, between the casing 2 and the annulus of the oil pipe 1 is the dynamic liquid surface of the oil-water mixture, and the pump tail pipe of the oil well pump 3 is located 1-2 m from the upper end of the perforation section 5 . The metal oil pipe 1 is used as the field oil pipe 1, and the sacrificial anode 4 is aluminum anode, zinc anode or other type of anode suitable for the well temperatur...
Example Embodiment
[0032] Example 3:
[0033] On the basis of Embodiment 1, this embodiment provides a figure 2 In the shown method for anti-corrosion in the casing of the production well, the pump hanger tail pipe is a non-metallic pipe 6 .
[0034] The non-metallic pipe 6 can be made of glass steel pipe, flexible composite pipe, etc. The tensile strength of the coupling joint must meet the site requirements. Using the non-metallic pipe 6 can reduce the hanging weight of the pump while avoiding corrosion.
[0035] No matter which method is adopted in Example 2 or Example 3, since the liquid from the dynamic liquid level to the tail pipe is a dead volume and is low-water-cut crude oil, the corrosion inhibitor can be added at one time to achieve the purpose of long-term corrosion protection, which can be large Significantly reduce the dosage of corrosion inhibitors and personnel costs.
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