Gas-fired steam-injection boiler for oil field

Patent metadata

Field	Value
Publication number	US-2024353095-A1
Application number	US-202218686569-A
Country	US
Kind code	A1
Filing date	May 30, 2022
Priority date	Aug 26, 2021
Publication date	Oct 24, 2024
Grant date	—

Abstract

A gas-fired steam-injection boiler has a flue and a water supply pipeline. The flue is provided with a radiation section and a convection section. The water supply pipeline has, in the flue gas flow direction, a first pipe section located at an upstream portion of the convection section, a second pipe section is located at a downstream portion of the convection section, and a third pipe section arranged between the first pipe section and the second pipe section. In a water flow direction of the water supply pipeline, the second pipe section, the first pipe section and the third pipe section are arranged in sequence. By using a flue gas condenser, the temperature of flue gas can be further reduced, and the latent heat of vaporization of steam in the flue gas is absorbed to form condensate water.

First claim

1 . A gas-fired steam-injection boiler for oil field, comprising a flue having a radiation section ( 1 ) and a convection section ( 2 ) that are arranged in a flue gas flow direction, and a water supply pipeline comprising a first pipe section, a second pipe section, and a third pipe section,
wherein in the flue gas flow direction, the first pipe section is located upstream the convection section ( 2 ), the second pipe section is located downstream the convection section ( 2 ), and the third pipe section is arranged between the first pipe section and the second pipe section; and wherein in a water flow direction of the water supply pipeline, the second pipe section, the first pipe section and the third pipe section ( 3 ) are arranged sequentially.

2 . The gas-fired steam-injection boiler for oil field of claim 1 , wherein the first pipe section is a plain pipe ( 21 ) of the convection section, and the second pipe section is a finned pipe ( 22 ) of the convection section.

3 . The gas-fired steam-injection boiler for oil field of claim 1 , wherein the third pipe section ( 3 ) comprises a plain pipe for evaporation ( 31 ) and a finned pipe for evaporation ( 32 ) that are arranged in the water flow direction of the water supply pipeline, and the plain pipe for evaporation ( 31 ) and the finned pipe for evaporation ( 32 ) are arranged sequentially in the flue gas flow direction of the convection section ( 2 ).

4 . The gas-fired steam-injection boiler for oil field of claim 1 , wherein the third pipe section ( 3 ) is arranged in a region at 800-900° C. in the convection section ( 2 ).

5 . The gas-fired steam-injection boiler for oil field of claim 1 , wherein the radiation section ( 1 ) extends horizontally, an opening is provided in an upper part of a downstream end of the radiation section ( 1 ), and the convection section ( 2 ) is in communication with the upper part of the downstream end of the radiation section ( 1 ) and extends upward vertically.

6 . The gas-fired steam-injection boiler for oil field of claim 5 , wherein the flue comprises a condensation section ( 4 ) extending upward vertically from an upper end of the convection section ( 2 ).

7 . The gas-fired steam-injection boiler for oil field of claim 6 , wherein the water supply pipeline comprises a heat exchange plain pipe ( 41 ) of the condensation section arranged in the condensation section ( 4 ), which is located upstream the second pipe section in the water flow direction of the water supply pipeline.

8 . The gas-fired steam-injection boiler for oil field of claim 7 , wherein the water supply pipeline is provided with a deaerator ( 10 ) and a pressure pump ( 11 ) between the heat exchange plain pipe ( 41 ) of the condensation section and the second pipe section, and is provided with a water tank 8 and a softener 9 upstream the heat exchange plain pipe ( 41 ) of the condensation section.

9 . The gas-fired steam-injection boiler for oil field of claim 6 , further comprises a condensation baffle ( 5 ) at a lower part of the condensation section ( 4 ), and a water collection tank located below the condensation baffle ( 5 ) and connected to a recovery tank ( 6 ) through a pipeline.

10 . The gas-fired steam-injection boiler for oil field of claim 5 , wherein the cross-sectional area of flow at a joint between a lower port of the condensation section ( 4 ) and an upper port of the convection section ( 2 ) is greater than that of the upper port of the condensation section ( 4 ), and a flue gas stack is provided at the upper port of the condensation section ( 4 ).

11 . The gas-fired steam-injection boiler for oil field of claim 1 , wherein the water supply pipeline comprises a radiation pipe section in the radiation section ( 1 ), and the second pipe section, the first pipe section, the radiation pipe section and the third pipe section ( 3 ) are arranged sequentially in the water flow direction of the water supply pipeline.

12 . The gas-fired steam-injection boiler for oil field of claim 11 , wherein the radiation section ( 1 ) comprises a high-temperature radiation section ( 16 ) and a low-temperature radiation section ( 17 ) that are arranged in the flue gas flow direction, and the radiation sections include a plain pipe ( 18 ) of the high-temperature radiation section in the high-temperature radiation section ( 16 ) and a plain pipe ( 19 ) of the low-temperature radiation section in the low-temperature radiation section ( 17 ), and the plain pipe ( 18 ) of the high-temperature radiation section and the plain pipe ( 19 ) of the low-temperature radiation section are arranged sequentially in the water flow direction of the water supply pipeline.

Assignees

• China Petroleum & Chem Corp
• Steam Injection Tech Service Center Of Shenglioilfield Sinopec

Inventors

• Chen Jun
• Zhang Naifeng
• Zhao Xuezhan
• Ma Bo
• Xiao Gang
• Yang Bin
• Shang Qingjun
• Huang Zhihong
• Zhang Yue
• Li Yong
• Chen Chao
• Jiang Linlin

Classifications

• F24H8/006

  Means for removing condensate from the heater · CPC title

• F22B21/24 Primary

  bent in serpentine or sinuous form · CPC title

• F22B29/06

  of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes (combined low- and high-pressure boilers of forced-flow type F22B33/16) · CPC title

• F22B31/08

  Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion · CPC title

• E21B43/285

  Melting minerals, e.g. sulfur (E21B43/24 takes precedence) · CPC title