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Double-pipe metering device, double-pipe metering method and double-pipe metering system

A technology of measuring device and measuring method, which is applied to the volume/mass flow generated by mechanical effects, and the detection of fluid flow by measuring differential pressure. , reduce labor intensity and production cost, optimize the effect of measurement process

Pending Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical defects that the existing single-pipe metering method cannot adapt to pressure and flow fluctuations and high transmission difference rate, the present invention provides a double-pipe metering device and its use method; The metering range is widened, and the metering accuracy is improved; according to field data statistics, the present invention can reduce the transmission error rate by more than 25%, corresponding to reducing the error of gas delivery volume by about 1.23×10 per quarter 4 m 3 , improve the quality of gas transmission, and reduce the economic losses of downstream users

Method used

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  • Double-pipe metering device, double-pipe metering method and double-pipe metering system
  • Double-pipe metering device, double-pipe metering method and double-pipe metering system
  • Double-pipe metering device, double-pipe metering method and double-pipe metering system

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Such as Figure 4 As shown, the natural gas from the wellhead 1 passes through the water jacket furnace 2, the separator 3 and the metering section in sequence, and then is transported to the user end through the gathering and transportation pipeline 7, wherein the metering section includes the main channel metering section 4 and the bypass channel which are connected in parallel and have the same structure. The metering section 5 and the bypass metering section 5 cooperate with the main metering section 4 to measure the flow of natural gas delivered to the gathering and transportation pipeline 7 .

[0052] Such as Figure 5-6 As shown, the main metering section 4 includes an inlet valve-43, an orifice throttling device-41, a differential pressure flowmeter-42 and an outlet valve-44 connected in series in sequence; the differential pressure flowmeter-42 passes through the low-pressure pipeline- 421 and high-pressure pipeline one 422 collect and form pressure difference...

Embodiment 2

[0060] Such as Figure 7 shown, combined with Figure 3-5 , the operation steps of the double-tube metering method using the double-tube metering device are:

[0061] A. When the flow Q in the main flow metering section 4 is stable and less than the set value Q1, keep the inlet valve 2 53 and the outlet valve 2 54 in a closed state, so that the main flow metering section 4 can be measured separately;

[0062] B. When the flow Q in the main metering section 4 continues to rise and reaches the set value Q1, open the outlet valve 2 54 and the inlet valve 2 53 in sequence to make the bypass metering section 5 start metering, that is, double-pipe metering.

[0063] C. When the flow Q in the main flow metering section 4 continues to drop and is lower than the set value Q1, close the inlet valve 2 53 and the outlet valve 2 54 in turn, so that the bypass metering section 5 stops measuring and returns to the main flow metering section 4 Individually metered status.

[0064] Wherein,...

Embodiment 3

[0070] Such as Figure 8 As shown, the double-pipe metering system includes a double-pipe metering device and a corresponding control system 6 .

[0071] Among them, the inlet valve 2 53 and the outlet valve 2 54 are both hydraulic gate valves, and their hydraulic control system is connected to the control system 6; the flow Q data output by the differential pressure flowmeter 1 42 is also sent to the control system 6; the control system 6. Monitor the flow Q in real time, and control the opening and closing of the inlet valve 2 53 and the outlet valve 2 54 according to the operation steps described in Embodiment 2, thereby replacing manual double-pipe metering control; the specific steps are as follows:

[0072] Set the threshold Q2 of the flow Q in the control system 6, and the setting value of Q2 should be consistent with or close to Q1, which can be set as 70% of the range of the differential pressure flowmeter one (42), or according to the control system 6 According to t...

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Abstract

The invention relates to the technical field of natural gas collection and transportation and particularly relates to a double-pipe metering device, a double-pipe metering method and a double-pipe metering system. The double-pipe metering device comprises a main pass metering section and a bypass metering section which are connected in parallel, wherein the main pass metering section and the bypass metering section are connected with an upstream pipeline through the same inlet and connected with a downstream pipeline through the same outlet, and the bypass metering section is used for being matched with the main pass metering section to meter output flow. According to the device, the metering process is optimized, the metering range is expanded, the application range is wide, technical defects of a single-tube metering mode are overcome, metering precision is improved, and economic loss of downstream users is reduced; the bypass metering section can be opened and the main metering section can be closed for maintenance under the condition of not stopping conveying, so production efficiency is improved; the double-pipe metering system can achieve all-weather automatic control, manual intervention is not needed, labor intensity and production cost can be greatly reduced, and safety and accuracy of pipeline conveying are improved.

Description

technical field [0001] The invention relates to the technical field of natural gas collection and transportation, in particular to a double-pipe metering device, a double-pipe metering method and a double-pipe metering system. Background technique [0002] In the early stage of development when natural gas wells have not yet formed large-scale production, the natural gas production is low and the transmission pipelines are not yet perfect, so the natural gas produced in the early stage of development mostly adopts the local sales model; in this case, the transportation and metering of natural gas will At the same time, it faces a variety of users, mainly including low-pressure civil use, CNG filling, and LNG power generation; multiple methods use gas at the same time, and the high and low peaks of gas consumption are frequently superimposed, forming frequent and obvious pressure and flow fluctuations, which affect the measurement accuracy. cause measurement errors. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/36
CPCG01F1/36
Inventor 周移兴刘永炬张伟荣张亮卜淘张伟胡涛陈程阴丽诗汪彩霞戚智果杨建明王宁海孔祥贵孙志刚陈刚
Owner CHINA PETROLEUM & CHEM CORP
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