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System and method for preparing two types of mixed refrigerants by means of recycling LNG (liquefied natural gas)/LPG (liquefied petroleum gas)/NGL (natural gas liquid) products from petroleum associated gas

A petroleum-associated gas and mixed refrigerant technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of high operating costs, high energy consumption, high investment, etc., to improve reliability, simplify operation and maintenance, The effect of saving running costs

Active Publication Date: 2015-12-16
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The object of the present invention is aimed at the refrigeration process in the process of recovering and producing LPG, NGL and LNG products from oilfield associated gas. The mixed refrigerant configured with isopentane and nitrogen has complex technical problems in outsourcing, transportation, storage, configuration, and detection systems, and makes full use of the characteristics of complete components of associated gas and the convenience of a large variety of products to provide a solution for In the associated gas recovery and production of LNG, LPG, and NGL, one of the two types of mixed refrigerants, shallow cooling and deep cooling, is prepared by using its own products (dry gas, LPG, and nitrogen-enriched tail gas) as raw materials in a specific proportion. Realize the purpose of shallow cold and deep cold

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  • System and method for preparing two types of mixed refrigerants by means of recycling LNG (liquefied natural gas)/LPG (liquefied petroleum gas)/NGL (natural gas liquid) products from petroleum associated gas

Examples

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Embodiment 1

[0055] A system for preparing two kinds of mixed refrigerants by recovering LNG / LPG / NGL products from petroleum associated gas, including a raw material associated gas pressurization and purification treatment module connected to an associated gas discharge device, the raw material associated gas pressurization and purification The processing module is connected to the LPG cold box module through a gas-liquid pipeline; the LPG cold box module is connected to the LNG cold box module through a gas-liquid pipeline, and the LPG cold box module and the LNG cold box module are connected to heavy hydrocarbons through a gas-liquid pipeline Fractionation module.

Embodiment 2

[0057] In this embodiment, a system for preparing two kinds of mixed refrigerants by recovering LNG / LPG / NGL products from petroleum-associated gas is used. On the basis of Embodiment 1, the pressurization and purification treatment module of raw material-associated gas includes preliminary gas-liquid The separator 1 and the feed gas booster unit 2, the desulfurization and decarbonization device 3, the desulfurization associated gas booster unit 4 and the normal temperature gas-liquid separator 5 connected in sequence with the preliminary gas-liquid separator 1; the normal temperature gas-liquid separator 5 The gas path is connected to the primary molecular sieve 7 and the LPG cold box 8 in turn, and the liquid path is connected to the heavy hydrocarbon scrubber 10.

[0058] In this embodiment, the LPG cold box module includes a primary molecular sieve 7 and an LPG cold box 8 connected to the primary molecular sieve 7 through an air path. There is a shallow cooling zone in the L...

Embodiment 3

[0063] This embodiment provides a system for preparing two mixed refrigerants by using the product described in Examples 1-2 to recover LNG / LPG / NGL from petroleum-associated gas and recovering LNG / LPG from petroleum-associated gas The method for preparing two kinds of mixed refrigerants from the product of / NGL includes a shallow cold mixed refrigerant preparation method and a deep cold mixed refrigerant preparation method, and the shallow cold mixed refrigerant preparation method includes the following steps in turn:

[0064] Step 1-1) Purchase LPG, vaporize and dehydrate it and add it to the LPG cold box module as a shallow refrigerant, enter the shallow cold mixed refrigerant circulation system, and carry out shallow cold mixed refrigerant circulation. The LPG purchased here is the previous stage It is used in the start-up phase. When the overall system starts normally and the generated LPG and dry gas can meet the usage of shallow cold mixed refrigerant, the use of outsourc...

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Abstract

The invention belongs to the field of technologies for recycling petroleum associated gas in oilfields, and particularly relates to a system and a method for preparing two types of mixed refrigerants by means of recycling LNG (liquefied natural gas) / LPG (liquefied petroleum gas) / NGL (natural gas liquid) products from petroleum associated gas. The system comprises a raw material associated gas pressurization and purification treatment module, an LPG cold box module, an LNG cold box module and a heavy hydrocarbon fractionation module. The raw material associated gas pressurization and purification treatment module, the LPG cold box module and the LNG cold box module are sequentially communicated with an associated gas exhaust device via gas and liquid pipelines, and the heavy hydrocarbon fractionation module is communicated with the LPG cold box module and the LNG cold box module via gas and liquid pipelines. The method includes a process for preparing shallow cooling mixed refrigerants and a process for preparing deep cooling mixed refrigerants. The system and the method have the advantages that series LNG refrigerating technologies implemented by the aid of the two types of mixed refrigerants which are prepared from the products (dry gas, LPG and nitrogen-rich tail gas) in recycling procedures by means of mixing according to specific proportions are utilized, accordingly, shallow cooling and deep cooling purposes can be achieved, the method and the system are simple in procedure, novel in idea, advanced in technique and low in energy consumption and investment, and the system can run stably and is convenient to maintain.

Description

technical field [0001] The invention belongs to the technical field of secondary utilization of petroleum associated gas in oilfields, and in particular relates to a system and method for preparing two kinds of mixed refrigerants by utilizing the products of LNG / LPG / NGL recovered from petroleum associated gas. Background technique [0002] Associated gas is oil associated gas in oilfields, which is the volatile part of crude oil. It is a petroleum-based flammable gas. It is a high-quality fuel and chemical raw material. [0003] In the past, due to the scattered and small amount of associated gas, the complex treatment process and high investment, most of them were treated by direct discharge or combustion, which not only polluted the environment, but also wasted resources. At the same time, there were potential safety hazards. , low-carbon economy and the concept of green development are inconsistent. [0004] Associated gas has high economic value. After the associated ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04
Inventor 刘子兵薛岗赵玉君李亚萍韩万龙李京子
Owner XIAN CHANGQING TECH ENG