Anti-corrosion thermal-proof oil pipe with thermal barrier coating on surface for thermal recovery of thick oil

Abstract

The invention relates to an anti-corrosion thermal-proof an oil pipe with a thermal barrier coating on the surface for thermal recovery of thick oil, which has the structure of single layer of oil pipe. The substrate of the oil pipe is made of steel used for pearlite heat resistance pipeline capable of resisting temperature below 600DEG C; a threaded connection coupling hoop adopts an API (American Petroleum Institute) long round button thread with good sealing performance; the inner surface of the thermal-proof oil pipe comprises an oil pipe coupling hoop and a chemical coating layer of which the thread part has even thickness which is not less than 40mu m; and the outer surface of the chemical coating layer is provided with a thermal barrier coating of which the thickness is not less than 0.30mm. According to the anti-corrosion thermal-proof oil pipe, the hohlraum of the thermal-proof oil pipe is enlarged, and air injection efficiency and thermal-proof performance are improved. The anti-corrosion thermal-proof oil pipe has strong capability of resisting high-temperature and high-pressure steam corrosion, saves steel, has simple structure and is easy to manufacture, and the service life is obviously prolonged under the working condition of the thermal recovery of thick oil.

Description

Technical field [0001] The invention relates to a method for reducing heat loss around the well wall, enhancing the heat insulation effect, increasing the dryness of steam injected into the target layer, improving the thermal efficiency of thermal recovery of heavy oil, and having the function of anti-creep and anti-corrosion, which is applied to the thermal recovery of heavy oil in the petroleum industry. Insulated tubing in the process. Background technique [0002] The world's heavy oil resources are quite rich, and the proven reserves are more than 300 billion tons. However, after more than a century of development in the oil industry, there are only 170 billion tons of thin oil resources available for exploitation. Therefore, some people say that the important energy source in the 21st century will be heavy oil. [0003] Heavy oil reservoirs are generally exploited thermally, and they can be divided into two types according to the heating method of the oil layer: one ...

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Problems solved by technology

[0015] 3. The threaded connection adopts API rectangular buckle, which has poor sealing performance;

[0016] 4. Two adjacent heat-insulated oil pipes are connected by a liner and a collar. There is no heat-insulating material between them, which increases the heat loss. When steam is injected from the wellhead to the bottom of the well and the oil layer, the heat passes through continuously. Heat insulation pipes, annular spaces, casings, cement rings and other heat transfer links are lost to the formation, and the heat insulation effect is still unsatisfactory;

[0017] 5. The heat-insulated oil pipe has poor resistance to high-temperature and high-pressure water vapor corrosion, especially at the threaded joints, which often cause early failure of the heat-insulated oil pipe due to corrosion problems

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