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Method for increasing light dydrocarbon recovery rate of oil-field associated gas through shallow condensing recovery

A technology for associated gas and light hydrocarbons in oilfields, which is applied in the field of refrigeration recovery by expanders to achieve the effects of improving economic benefits and improving recovery rates.

Active Publication Date: 2011-05-25
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for improving the efficiency of shallow cooling recovery of light hydrocarbons associated with oilfield associated gas to solve the problem of carbon dioxide in the discharged dry gas after shallow cooling treatment. 3 + The problem of high component content, while recovering the energy of the exhausted dry gas, saving energy and improving the economic benefits of the entire process

Method used

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  • Method for increasing light dydrocarbon recovery rate of oil-field associated gas through shallow condensing recovery
  • Method for increasing light dydrocarbon recovery rate of oil-field associated gas through shallow condensing recovery
  • Method for increasing light dydrocarbon recovery rate of oil-field associated gas through shallow condensing recovery

Examples

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Embodiment 1

[0018] Example 1: 66000Nm 3 / d oilfield associated gas A(C 3 + : 13.75v%) enters the buffer tank 6 at 0.14MPa, the compressor 1 increases the pressure to 1.6MPa, and after the temperature of the cooler 2 drops to 40°C, the temperature is reduced to -25°C through the cold box 3 heat exchange. The condensed oilfield associated gas enters the gas-liquid separator 4 for gas-liquid separation to obtain a liquid-phase crude product, which is heat-exchanged to -12°C in the cold box 3 to obtain a liquid-phase product B, and subsequent processing can obtain high-purity C 3 + Components: The gas phase products of the gas-liquid separator are processed by different schemes, and then discharged into the gas pipeline network as dry gas after heat exchange in the cold box 3.

[0019] Scheme 1: Shallow cooling coupling membrane separation recovery of light hydrocarbons in oilfield associated gas and expansion machine recovery cooling capacity

[0020] figure 1 As shown, the gas-phase pr...

Embodiment 2

[0039] Example 2: 40000Nm 3 / d oilfield associated gas A(C 3 + : 12.56v%) enters the buffer tank 6 at 0.11MPa, the compressor 1 increases the pressure to 1.6MPa, and after the temperature of the cooler 2 drops to 40°C, the temperature is reduced to -25°C through the cold box 3 for heat exchange. The condensed oilfield associated gas enters the gas-liquid separator 4 for gas-liquid separation to obtain a liquid-phase crude product, which is heat-exchanged to -12°C in the cold box 3 to obtain a liquid-phase product B, and then high-purity C can be obtained through subsequent processing 3 + Components: The gas phase products of the gas-liquid separator are processed by different schemes, and then discharged into the gas pipeline network as dry gas after heat exchange in the cold box 3.

[0040] Scheme 1: Shallow cooling coupling membrane separation recovery of light hydrocarbons in oilfield associated gas and expansion machine recovery cooling capacity

[0041] figure 1 As s...

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Abstract

The invention relates to a method for increasing the light dydrocarbon recovery rate of oil-field associated gas through the shallow condensing recovery, belonging to the technical field of petrochemical engineering. The method is characterized in that the traditional shallow condensing technology is coupled with the new membrane separation technology; and an expander is also used to perform power recovery to the output dry gas. A gas separation membrane unit can have a hollow fiber, plate frame or spiral wound type structure. When gaseous products are separated by a membrane component, C3<+>component firstly passes through the membrane to reach the other side; the concentrated C3<+> gas is on the permeate side; the gas is circulated before sent back to a compressor; and residual gas expands to reach the required pressure of dry gas output, and the cold energy generated through is used for heat exchange. The invention has the following effects and benefits: under the condition of notreducing the condensing temperature, the light dydrocarbon recovery rate of the shallow condensing equipment can be obviously increased and the energy of the output dry gas can be effectively recycled through the introduction of the expander, thus the economic benefit of the oil field can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a gas separation method, in particular to recovery of oil field associated gas through compression and condensation treatment. 3 + components, and then through the membrane separation device to increase the C 3 + The recovery rate and the method of using the expander to recover the cooling capacity. Background technique [0002] As a high-quality fuel, oilfield associated gas is mainly composed of methane and ethane, which also contains a small amount of C 3 + components. C 3 + The components are high-quality chemical raw materials, C 3 + The recovery of components can not only give full play to the value of oilfield gas, but also facilitate the transportation of oilfield gas, thus solving the problem of oilfield gas freezing and blocking in winter. It can be seen that C in oilfield gas 3 + The further recovery of components can not only save energy, but ...

Claims

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Application Information

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IPC IPC(8): C10G1/00C10G1/06F25J3/06B01D53/22
CPCY02P20/10
Inventor 贺高红于长福李保军阮雪华朱向阳吴雪梅
Owner DALIAN UNIV OF TECH
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