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Throttling device and method for performing throttling by using throttling device

A throttling device and gas throttling technology, which is applied in the pipeline system, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of manual maintenance and large fuel consumption, and achieve the cost saving of manual maintenance, fuel saving, The effect of increasing the external temperature

Inactive Publication Date: 2014-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned heating throttling method has the disadvantages of consuming a large amount of fuel and requiring regular manual maintenance

Method used

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  • Throttling device and method for performing throttling by using throttling device
  • Throttling device and method for performing throttling by using throttling device
  • Throttling device and method for performing throttling by using throttling device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] use figure 1 Throttle shown in throttling device.

[0060] The ambient temperature is 0°C, and the high-pressure natural gas flow (pressure is 16MPa, temperature is 24°C, flow rate is 2×10 4 m 3 / day), and first remove the solid impurities therein through a cyclone separator (purchased from Huayou HBP Technology Co., Ltd., model HBP-325). The high-pressure natural gas flow through the cyclone separator enters the vortex tube (the non-freezing and blocking vortex tube described in U.S. Patent US05749231A, the structure is improved as the vortex tube described in Fig. 2 of this U.S. patent, and is equipped with Upper pipe valve and control parts to realize throttling heating and automatic operation), cold flow 10 flows out from the outlet of the cold end, and hot flow 11 flows out from the outlet of the hot end; The gas flow temperature was 20°C.

[0061] Open the flow regulating valve 3 and close the flow regulating valve 4 at the same time, so that the cold flow 10 ...

Embodiment 2

[0069] Repeat the test in Example 1, the difference is that the pressure of the raw natural gas flow is 8 MPa, the flow ratio of cold flow / hot flow is 7:3 (volume ratio), the temperature of the airflow (10) at the cold end of the vortex tube is -36 °C, the vortex tube The temperature of the hot end airflow (11) is 48°C.

[0070] The output temperature of the mixed gas detected by the detection sensor is 7-8°C, which is higher than the natural gas hydrate formation temperature (2°C) at 1.6MPa, which can meet the export requirements.

Embodiment 3

[0072] Repeat the test in Example 1, the difference is that the pressure of the raw natural gas flow is 4MPa, and the flow ratio of cold flow / hot flow is adjusted to 3:7; ) temperature is 21°C.

[0073] The output temperature of the mixed gas detected by the detection sensor is 10-12°C, which is higher than the natural gas hydrate formation temperature (2°C) at 1.6MPa, which can meet the export requirements.

[0074] As can be seen from the above three embodiments, utilizing the throttling device according to the present invention, the throttling device can save the wellhead throttling heating furnace in the prior art, thereby saving a large amount of fuel; and saving manual maintenance the cost of.

[0075] The present invention also provides a method for gas throttling using the throttling device at the wellhead of a gas field, comprising the following steps:

[0076] a) The air inlet is connected to the separator, and the gas to be throttled is introduced into the separat...

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Abstract

The invention relates to a throttling device for gas throttling in a well mouth of the gas field and a method for performing throttling by using the throttling device. The throttling device comprises a vortex pipe, a hot flow pipeline, at least two cold flow pipelines and an output pipeline, the vortex pipe is used for receiving gas to be throttled, and comprises a cold end for outputting a cold flow portion and a hot end for outputting a hot flow portion, the hot flow pipeline is used for receiving the hot flow portion from the hot end, the cold flow pipelines are used for receiving the cold flow portion from the cold end, heat exchangers are arranged in the cold flow pipelines, the heat exchangers are arranged to receive heat from the hot flow pipeline and heat the cold flow portion, and the output pipeline is connected with the hot flow pipeline and the cold flow pipelines and used for outputting mixed gas of the hot flow portion and the cold flow portion. Flow distribution of the gas flow in the cold segment and the hot segment is controlled, the temperature of the final mixed gas is higher than the generation temperature of natural gas hydrates, and the aims that a heating furnace is removed, and fuels and labor are saved are achieved.

Description

technical field [0001] The invention relates to a throttling device, in particular to a throttling device for gas throttling at the wellhead of a gas field. The invention also relates to a throttling method using the throttling device. Background technique [0002] In the exploitation of high-pressure natural gas fields, the wellhead pressure of the gas well is much higher than the design pressure of the gathering and transportation system. Therefore, natural gas must be throttled and depressurized before gathering and transporting. However, the cooling phenomenon accompanying the throttling process easily leads to the formation of hydrates and freezing blockage. In order to prevent hydrates from freezing and blocking, the gathering and transportation process of heating and throttling is usually adopted in production. But heating gathering and transportation needs to consume about 1% of natural gas, and safety and maintenance issues must be considered. [0003] The commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D1/02F17D3/01
Inventor 李伟徐正斌黄辉颜映霄粟科华李玉凤
Owner CHINA PETROLEUM & CHEM CORP