Anti-corrosion method for mechanical oil extraction shaft

An oil production well and machinery technology, applied in the field of oilfield development and oil production technology, can solve problems such as oilfield losses, threats to normal operation of oil pumps, and reduction in tensile and internal pressure strength.

Inactive Publication Date: 2013-06-19
陈建军
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Problems solved by technology

Every time the pipe wall becomes thinner by 1 mm, its tensile strength, external extrusion resistance, and internal pressure resistance will decrease by more than 18% for Φ73 mm tubing, and 10% for Φ139.7 mm casing. operation; (except for the casing damage caused by the fault, most of the casing damage is caused by...

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  • Anti-corrosion method for mechanical oil extraction shaft

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] See attached figure 1 , the mechanical oil recovery is to lift the formation fluid 8 from the downhole to the surface through the oil pump 7 and the sucker rod 5 arranged in the wellbore, and enter the surface transmission pipeline 1 after being controlled by the oil pipe gate 1. During the generation process, the oil pipe 4 The formation fluid level 6 in the annular space between the tubing and casing 3, that is, the annular space 9 between the tubing and the casing fluctuates, and the air is continuously mixed into the formation fluid 8 with high salinity through the casing gate 2, so that It will cause: a. to make the formation fluid corrosive; b. to accelerate the corrosion rate of the formation fluid containing corrosive gases such as hydrogen sulfide and carbon dioxide, and to corrode the wet inner wall of the casing 3 and the outer wall of...

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Abstract

The invention relates to an anti-corrosion method for a mechanical oil extraction shaft, and belongs to the technical field of oilfield development and oil extraction. The anti-corrosion method comprises the following steps: the amount of inert gas needed by corrosion-free residue in oil shaft products is determined through a laboratory test; an oil pipe valve is opened firstly, an inert gas source is connected with a sleeve pipe connection pipe through a pipeline, and then a sleeve pipe valve is opened, so that the connection pipe is communicated with an annular space of an oil pipe and a sleeve pipe; the inert gas is injected into the annular space of the oil pipe and the sleeve pipe through the sleeve pipe inlet; a sample is taken from an oil pipe outlet for a laboratory test in the injection process of the inert gas; and the inert gas is injected until no corrosive residue exists in the sample of the oil pipe outlet. The anti-corrosion method is simple in operation, low in cost, and good in anti-corrosion effect. The inert gas is used for isolating the air or diluting and drying corrosive gas, metal inside the shaft or a ground conveying pipeline is effectively prevented from being corroded, maintenance frequency and cost are lowered, and work efficiency is improved.

Description

technical field [0001] The invention relates to an anti-corrosion method for a mechanical oil recovery shaft, belonging to the field of oil field development and recovery technology. Background technique [0002] There are three sources of corrosion in wellbore casings, oil pipes, sucker rods and other downhole tools of mechanical oil production wells: external (such as air) corrosion, formation output (such as hydrogen sulfide, carbon dioxide) corrosion, and external addition of formation output material corrosion. Over the years, in order to solve the corrosion problem of mechanical oil production wells, people have invented a variety of treatment methods: 1 Covering method: a coating anti-corrosion layer, b steel surface anti-corrosion treatment, c adding lining pipe...etc.; 2 neutralization (or alternative) method: a anode protector, b filling corrosion inhibitor, c corrosion inhibition rod and so on. Due to the complexity, mutual superposition and interaction of corro...

Claims

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Application Information

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IPC IPC(8): E21B41/02
Inventor 陈建军
Owner 陈建军
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