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Process and system for producing light hydrocarbon and LNG (Liquefied Natural Gas) from oilfield associated gas

A technology for oilfield associated gas and light hydrocarbons, which is used in the petroleum industry, gas fuel, liquid hydrocarbon mixture recovery, etc., and can solve the problems of complex cold boxes

Active Publication Date: 2021-05-18
SICHUAN HENGRI GAS ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the system adopts graded cooling, and the cold box is more complicated
[0007] From the above, it can be seen that there is currently no process or system for the simultaneous production of light hydrocarbons (LPG and stable light hydrocarbons) and LNG using oilfield associated gas at home and abroad.

Method used

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  • Process and system for producing light hydrocarbon and LNG (Liquefied Natural Gas) from oilfield associated gas

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 , The system embodiment of the present invention includes a low temperature scrubber 1, a demethylation ethane tower 2, a liquefied gas tower 8, a low temperature separator 15, a demethylation ethane tower top condenser 3 and a cold box 14. The low-temperature scrubber 1 has an inlet port, an outlet port, a washing liquid inlet port and a heavy hydrocarbon outlet used as the inlet of oilfield associated gas (which has been decarburized and dehydrated before entering the system). The gas outlet port is connected to the first The inlet and the gas outlet port of the low-temperature scrubber 1 can also be connected with fuel gas pipes through pipelines. The first outlet of the cold box 14 is connected to the inlet of the low-temperature separator 15 by a pipeline, and the first outlet of the low-temperature separator 15 is connecte...

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Abstract

The invention relates to a process and a system for producing light hydrocarbon and LNG (Liquefied Natural Gas) from oilfield associated gas. The process comprises the steps of washing to remove heavy hydrocarbon, pre-cooling, NGL (Natural Gas Liquefied) recycling, liquefying, refrigerating and the like. NGL recovery and LNG liquefaction are designed into one process, compared with an independent production process, a repeatedly used heat exchanger can be removed, the pressure drop between two units is reduced, the energy consumption is reduced, meanwhile, equipment is reduced, the occupied area is saved, and the investment is reduced. By adopting the process provided by the invention, the propane recovery rate can reach 98% or above.

Description

technical field [0001] The invention relates to the field of natural gas, in particular to a process and a system for producing light hydrocarbons and LNG from oilfield associated gas. Background technique [0002] Oilfield associated gas is an important product in the oil production process. It is a mixed gas containing a variety of alkanes. Its main components are methane and ethane, and contain a small amount of propane, butane or pentane, all of which are clean If energy is not recycled, it will not only cause huge losses, but also cause environmental pollution. my country's oilfield associated gas resources are considerable. At present, most small oilfields in China use the flare combustion process for the treatment of oilfield associated gas. Although this treatment method reduces the hazards of oilfield associated gas to a certain extent, it causes waste of resources on the one hand. ratio drops, but CO 2 Ratio rises. Based on this, the recovery and utilization of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G5/00C10G5/06C10L3/12C10L3/10
CPCC10G5/00C10G5/06C10L3/12C10L3/10
Inventor 王弯弯苏柯洋宋玲
Owner SICHUAN HENGRI GAS ENG CO LTD
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