CN202903248U - Wellhead simple orifice flowmeter - Google Patents

Abstract

The utility model discloses a simple and easy orifice plate flowmeter of well head is designed for the high accuracy measurement of liquid, gas and steam conduit flow, and the orifice fitting is established in the orifice plate centre bore promptly, and the orifice plate is established and is being got between the flange and the low reaches pressure flange terminal surface by bolted connection's upper reaches. And the upstream pressure-taking flange and the downstream pressure-taking flange are provided with radial pore plate pressure-taking ports. One end of the pressure guide pipe is connected with the orifice plate pressure taking port, and the other end of the pressure guide pipe is connected with the differential pressure transmitter. The differential pressure transmitter, the temperature transmitter of the connecting pipeline and the pressure transmitter are connected with a data radio station. When the pipeline fluid flows through the orifice plate, the pipeline fluid contracts at the throttling part, so that the flow velocity is increased, the static pressure is reduced, and pressure difference is generated in front of and behind the throttling part, so that the flow can be measured according to the pressure difference. The utility model discloses but the simple and easy orifice plate flowmeter wide application of well head is in the flow measurement of gas, steam and liquid, has characteristics such as precision height, with low costs, simple structure, easy maintenance, stable performance and use reliably.

Description

Wellhead simple orifice flowmeter

technical field

The utility model relates to a simple orifice plate flowmeter at the wellhead, which belongs to the technical field of wellhead measurement of natural gas wells.

Background technique

At present, the flowmeters used in gas wells in the Sulige area are mainly intelligent precession vortex flowmeters, which have disadvantages such as inaccurate measurement, low measurement accuracy and high measurement cost. In winter production, the pressure guiding pipe of the conventional orifice flowmeter is easy to freeze and block, which often leads to the failure of the flowmeter.

Contents of the invention

The purpose of the utility model is to provide a simple orifice plate flowmeter at the wellhead, which has high precision and simple structure, and can be used for measuring the flow of liquid, gas and steam in pipelines.

The concrete technical scheme of the utility model is as follows:

The throttling piece is arranged in the central hole of the throttling orifice, and the throttling orifice is arranged between the upstream pressure-taking flange and the end face of the downstream pressure-taking flange connected by bolts. The upstream pressure-taking flange and the downstream pressure-taking flange are provided with radial orifice plate pressure-taking ports. One end of the pressure guiding tube is connected to the pressure port of the orifice plate, and the other end is connected to the differential pressure transmitter. The differential pressure transmitter, the temperature transmitter connected to the pipeline and the pressure transmitter are all connected to the data station.

The utility model wellhead simple orifice flowmeter can be widely used in gas, steam and liquid flow measurement, and has the characteristics of high precision, low cost, simple structure, convenient maintenance, stable performance and reliable use.

Description of drawings

Figure 1 is a schematic diagram of a simple orifice flowmeter throttling orifice at the wellhead.

Figure 2 is a working diagram of a simple orifice flowmeter at the wellhead.

Detailed ways

The embodiment of the utility model is further described with reference to Fig. 1 and 2:

Example:

The simple orifice plate flowmeter of the utility model consists of an orifice plate pressure taking port 1, an upstream pressure taking flange 2, a throttling orifice plate 3, a downstream pressure taking flange 4, a differential pressure transmitter 5, a pressure guiding pipe 6, and a throttling piece 7 Temperature transmitter 8, pressure transmitter 9 and data station 10 are composed of:

The throttling member 7 is set in the central hole of the throttling orifice plate 3, and the throttling orifice plate 3 is set between the end faces of the upstream pressure-taking flange 2 and the downstream pressure-taking flange 4 connected by bolts. The upstream pressure-taking flange 2 and the downstream pressure-taking flange 4 are provided with radial orifice plate pressure-taking ports 1 . One end of the pressure guiding pipe 6 is connected to the pressure port 1 of the orifice plate, and the other end is connected to the differential pressure transmitter 5 . The differential pressure transmitter 5 , the temperature transmitter 8 and the pressure transmitter 9 connected to the pipeline are all connected to the data station 10 .

The working principle of the simple orifice flowmeter at the wellhead is as follows:

In production and application, when the fluid in the pipeline flows through the throttling orifice 3, it contracts at the throttling member 7, increasing the flow velocity, reducing the static pressure, and generating a pressure difference before and after the throttling member 7. The greater the fluid flow rate, the greater the pressure difference generated, so the flow rate can be measured according to the pressure difference between the front and back of the throttling member 7 .

The relationship between fluid flow and differential pressure is determined by the following formula:

q _m= C/(1-β ⁴ ) ^0.5 ×ξ×π/4×d ² (2△P ρ ₁ ) ^0.5

q _v =q _m /ρ ₁

q _m : mass flow Kg/s

q _v : volumetric flow m ³ /s

C: Outflow Coefficient Dimensionless

ξ: Dimensionless expansion coefficient

d: Throttle aperture m of the throttling piece

△P: differential pressure Pa

ρ ₁ : fluid density Kg/m ³

In order to avoid freezing of the pressure guiding pipe 6 in winter, the following design can be adopted:

(1) Design the pressure guiding tube 6 vertically;

(2) When conditions permit, reduce the length of the pressure guiding tube 6 to a minimum;

(3) Increase the diameter of the pressure guide tube 6;

(4) Install the gauge head of differential pressure transmitter 5 vertically.

The precautions for installing the utility model are as follows:

(1) The parameters of the pipeline and fluid to be installed with the throttling orifice plate 3 should be consistent with the design of the standard orifice plate.

(2) Pay attention to the installation direction of the throttle orifice 3 in the pipeline so that the fluid flows from the upstream end face of the throttling member 7 to the downstream end face.

(3) The throttle orifice 3 should be perpendicular to the pipeline axis.

(4) The throttling orifice 3 should be installed between two circular straight pipe sections with constant cross section.

(5) If you want to further improve the measurement accuracy of the throttle orifice 3, in addition to ensuring that the front and rear straight pipe sections have sufficient length, you can also connect a "flow rectifier".

(6) After installation, make sure that the pressure at the top and bottom of the orifice plate pressure port 1 is normal and there is no leakage.

Claims (1)

1. simple and easy orifice flowmeter of well head is characterized in that:

Throttling element (7) is located in throttling orifice plate (3) center pit, and throttling orifice plate (3) is located at by between bolted upstream pressure flange (2) and downstream pressure flange (4) end face; Upstream pressure flange (2) and downstream pressure flange (4) are provided with orifice plate pressure tappings (1) radially; Connecting pipe (6) one ends connect orifice plate pressure tappings (1), and the other end connects differential pressure transmitter (5); The temperature transmitter (8) of differential pressure transmitter (5), connecting tube is connected 9 with pressure unit) all be connected with data radio (10).

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