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A constant-pressure start-up method for hot waxy crude oil pipeline

A technology for oil pipelines and high-pressure startup, which is applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc. It can solve problems such as inapplicability, and achieve the effect of improving the success rate and reducing the risk of stoppage

Active Publication Date: 2019-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device can only be used for regular research in the laboratory, but cannot be applied in actual production operations

Method used

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  • A constant-pressure start-up method for hot waxy crude oil pipeline
  • A constant-pressure start-up method for hot waxy crude oil pipeline
  • A constant-pressure start-up method for hot waxy crude oil pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the waxy crude oil pipeline system of the present invention includes a main oil pump 2, a backup pump 3, an oil pipeline, a buffer tank 1, a process switching valve 4, a pressure relief valve 5, a pressure control system and an internal circulation pipeline 13;

[0039] When the stopped pipeline system is restarted, the standby pump 3 is connected in series to the oil pipeline so that it is located downstream of the main oil pump 2; An internal circulation pipeline 13 is set between the outlet of the first-stage oil delivery pump, that is, the outlet of the backup pump 3 and the inlet of the buffer tank 1, and a branch flow regulating valve 7 is arranged on the internal circulation pipeline; The opening of the road flow regulating valve is used to control the crude oil flow through the internal circulation pipeline, so as to realize the constant high-pressure startup of the crude oil pipeline; when the pressure of the waxy crude oil in the ext...

Embodiment 2

[0046] Such as Figures 2 to 3 As shown, the waxy crude oil pipeline auxiliary starting device used in the present invention includes: vehicle frame 2, liquid storage tank 3, reaction tank 4, control system 8 and propulsion system, and the propulsion system is installed on the vehicle frame 2 for promoting Frame 2 moves. The liquid storage tank 3 and the reaction tank 4 are respectively equipped with reactants for the reaction to generate gas, that is, the liquid storage tank 3 is used to contain the liquid first reactant, and the reaction tank 4 is used to contain the second reactant. The reactant and the second reactant can react to form a gas. The liquid storage tank 3 and the reaction tank 4 are installed on the vehicle frame 2 respectively, and the liquid storage tank 3 is higher than the reaction tank 4, and the liquid storage tank 3 and the reaction tank 4 are communicated through a conduit 6, and one end of the conduit 6 is connected to the liquid storage tank 3 The ...

Embodiment 3

[0060] This embodiment is basically the same as Embodiment 1, except that the wheel mechanism of this embodiment adopts 4 wheels, and the 4 wheels are arranged in a rectangular shape at the lower position of the vehicle frame.

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Abstract

The invention discloses a constant-pressure start method for a hot waxy crude oil pipeline. When a pipeline system stopping transport starts again, a standby pump is connected in series into the oil pipeline and located at the downstream part of a main oil transport pump; the oil pipeline is provided with a buffer tank at the upstream part of the main oil transport pump, a circulating pipeline is arranged between the outlet of the final-stage oil transport pump, namely, the standby pump and the inlet of the buffer tank, and a branch flow regulating valve is arranged on the circulating pipeline; the opening of the branch flow regulating valve is regulated according to the change of the outlet pressure of the final-stage oil transport pump, so that crude oil flow passing the circulating pipeline is controlled, and the crude oil pipeline starts at a constant high pressure. The process is improved with the standby pump, and constant high pressure of the outer transport pipeline is kept in a start process, so that the transport stopping risk of the outer transport pipeline due to too high thixotropic pressure of the hot waxy crude oil in the start process is reduced.

Description

technical field [0001] The invention relates to the field of crude oil pipeline transportation, in particular to a fast and stable start-up method for hot waxy crude oil pipeline under constant pressure. Background technique [0002] At present, more than 80% of domestically produced crude oil is waxy crude oil. As the domestic production of waxy crude oil continues to grow and the demand for energy continues to increase, the realization of the pipeline transportation process of waxy crude oil has important practical significance in terms of safe transportation, energy saving and consumption reduction. [0003] Waxy crude oil is a non-Newtonian thixotropic fluid, which is characterized by high wax content, high freezing point, low density, poor fluidity, and the property that the apparent viscosity decreases with the extension of the shear force. Therefore, in general, during the start-up stage of waxy crude oil pipeline transportation, the oil pump exerts shear force on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/14F17D3/01
CPCF17D1/14F17D3/01
Inventor 刘名瑞肖文涛王晓霖薛倩李雪
Owner CHINA PETROLEUM & CHEM CORP
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