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Treatment of Metal Surfaces to Alter Their Thermal Radiation Characteristics

IP.com Disclosure Number: IPCOM000030260D
Publication Date: 2004-Aug-03
Document File: 1 page(s) / 11K

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Abstract

Gasses entering a well bore will contain evaporated water. This evaporated water does not consist of tiny particles of liquid held in suspension in the gas but is itself a gas as invisible as the gas with which it mixes. The volumeof water that canbe held evaporated in a gas is determined by the gas’s chemical composition, temperature and pressure. When, at a given pressure and temperature, a gas is holding all the evaporated water it can, the gas is said to be saturated or slits dew point or-st 400%-relative-humidity.

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TITLE OF INVENTION:

Treatment of Metal Surfaces to Alter Their Thermal Radiation Characteristics

Gasses entering a well bore will contain evaporated water. This evaporated water does not consist of tiny particles of liquid held in suspension in the gas but is itself a gas as invisible as the gas with which it mixes. The volumeof water that canbe held evaporated in a gas is determined by the gas’s chemical composition, temperature and pressure. When, at a given pressure and temperature, a gas is holding all the evaporated water it can, the gas is said to be saturated or slits dew point or-st 400%-relative-humidity.

As the gas flows up the well bore the temperature of the adjacent formation progressively declines.-as.will the gas’ pressure. As the gas flows up the well bore it will lose heat to the progressively cooler formation so that the temperature of the gas will also decline. At some point in the well bore gas pressure and temperature may reach a point that the volume of water evaporated in the gas exceeds what the gas can hold and liquid water begins to condense out of the gas.

If the gas’ flowing velocity is high enough aerodynamic drag forces on the waterdroptets wiiIcarryihe~m~ut-of the welL If the gas velocity is not high enough the water will begin to collect as fog, “rain” and slugs within the well bore. Produced gas must now fight its way through this water gauntlet which acts to increase the back pressure on the producing formation, reducing the inflow of gas. At some point gas production may fall to a level where it is not economical to produce the well or production- may-stopzalltogether.

The produced gas in the production tubing can be heated to keep it above its dew pointand this is the-subject of patents held by Centrilift. Because the adjacent formation is a massive heat sink it is economically desirable to thermally insulate the production tubing andthe heating source from the formation. Having the annulus, between t...