Pipeline preheating method and device
A pipeline and hot water preheating technology, applied in pipeline heating/cooling, pipes/pipe joints/fittings, mechanical equipment, etc., can solve oil and gas condensation pipes, affect the operation of oil and gas gathering and transportation pipelines, and reduce the initial end of oil and gas gathering and transportation pipeline systems Temperature and other issues
Active Publication Date: 2017-09-29
PETROCHINA CO LTD
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[0003] In the prior art, when preheating a newly-built oil and gas gathering and transporting pipeline in an already operating oil and gas gathering and transporting pipeline system, since the heat balance temperature established at the beginning of the already running oil and gas gathering and transporting pipeline system is relatively high, this is lower than When the preheated hot water at the temperature of thermal balance enters the oil and gas gathering and transportation pipeline, it will reduce the temperature at the beginning of the already running oil and gas gathering and transportation pipeline system, which may cause the oil and gas to condense during the transportation process, which will affect the oil and gas gathering and transportation pipeline system Operation of other oil and gas gathering and transportation pipelines
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0038] The embodiment of the present invention provides a method for pipeline preheating, which involves an electric regulating valve, which can be used to adjust the input flow rate of preheated water. In the embodiment of the present invention, the length of the oil and gas gathering and transportation pipeline is 2500 m, the heat transfer coefficient with the outside world is 3.0W / (m 2 .℃), the buried depth of the pipeline is 1.5m below the natural floor, and the ground temperature is 0℃. figure 1 As shown, the processing flow of the method may include the following steps:
[0039] In step 101, the preheated water with a temperature in the range of 50° C. to 70° C. is input into the oil and gas gathering and transportation pipeline...
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The embodiment of the invention discloses a pipeline preheating method and device, belonging to the field of oil and gas gathering and transportation. The method includes: inputting preheated water with a temperature in the range of 50°C to 70°C into the oil and gas gathering and transportation pipeline at a first input flow rate; , adjust the input flow rate of the preheated water to the second input flow rate; when it is determined that the temperature of the water flow front end of the preheated water is the second preset temperature, adjust the input flow rate of the preheated water to the third Input flow rate; when it is determined that the temperature of the preheated water at the end of the oil and gas collection and transportation pipeline is the third preset temperature, the preheating of the oil and gas collection and transportation pipeline is completed, and the input of preheated water is stopped. By adopting the invention, the normal commissioning of the newly-built oil-gas gathering-transporting pipeline in the oil-gas gathering-transporting pipeline system can be ensured.
Description
technical field [0001] The invention relates to the field of oil and gas gathering and transportation, in particular to a pipeline preheating method and device. Background technique [0002] With the development of oilfields, large-scale underground oil and gas gathering and transportation pipelines have been constructed and put into use. In order to prevent high-temperature oil and gas from entering low-temperature gathering and transportation pipelines, accidents of condensation pipes occur due to the rapid cooling of oil and gas, and underground oil and gas gathering and transportation pipelines are mostly used Large displacement input preheated water for preheating, the temperature of the preheated water increases from low to high gradient, when the oil and gas gathering and transportation pipeline establishes thermal balance with the surrounding soil, oil and gas are input into the oil and gas gathering and transportation pipeline for transmission. [0003] In the prior...
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Inventor 张军王永旺罗美丽付旭东徐永峰牟燕李红波翟婷婷刘斌黄健邓华
Owner PETROCHINA CO LTD