CN115110944A - Moisture on-line metering device - Google Patents

Abstract

The invention discloses a moisture online metering device which is mainly formed by connecting two core component double-phase separation heads and a multi-value shared data head in series, wherein each double-phase separation head comprises a moisture inlet pipe fitting, a wire mesh demister, a gas-phase central pipe, a gas-phase buffer chamber, a gas-phase balance chamber, a gas-phase communicating pipe, a cyclone inlet ring, a high-efficiency cyclone, a double-phase separation head cylinder, a gas-liquid annular channel, a liquid-phase annular channel, a middle guide cylinder, an isolation short section, a guide pipe section and a liquid-phase middle annular channel; the multi-value shared data head mainly comprises a fixed value nozzle flowmeter, a fixed value V-shaped groove flowmeter and a double-channel associated regulator, and the three items are respectively and independently applied for invention patents. The two-phase separation head ensures the separation effect of the gas-liquid two-phase flow, and the multi-value shared data head accurately measures the gas-liquid two-phase flow, so that the integrated technology not only simplifies the gathering and transportation process, but also reduces the one-time engineering investment to the maximum extent.

Description

Moisture online metering device

technical field

The invention relates to the field of measurement of natural gas wells and shale gas wells in oil and gas fields, in particular to a wet gas online measurement device, which is mainly used for online flow measurement and detection of wet gas such as condensate natural gas and shale gas.

Background technique

At present, in the field of measurement of natural gas wells and shale gas wells, there are common problems. First, the pressure of natural gas wells and shale gas wells is high, and the instrument selection surface is very narrow; the second is the gathering and transportation measurement of natural gas wells and shale gas wells. The process is relatively long, the gas-liquid separation equipment is bulky, and the measuring instruments are not only numerous and complicated, and coupled with the uncertainty of the initial development plan, it is difficult for the measuring range of the instrument to meet the later measurement requirements.

The present invention proposes a wet gas online metering device based on the above-mentioned deficiencies in the oil and gas metering process of natural gas wells and shale gas wells. The metering device is mainly composed of a dual-phase separation head and a multi-value shared data head in series, wherein the dual-phase separation head effectively separates the gas-liquid two-phase flow, and the separated gas-liquid two-phase flow enters the multi-value shared data head, and then Accurate measurement of gas-liquid two-phase flow is completed by fixed-value nozzle flowmeter and fixed-value V-shaped groove flowmeter respectively.

SUMMARY OF THE INVENTION

Based on the actual requirements of the oil and gas field metering process, the invention is designed for integrated integration and innovation. It is mainly composed of two core components, a dual-phase separation head and a multi-value shared data head, in series. The dual-phase separation head includes a wet gas inlet pipe, a wire Net demister, gas-phase central pipe, gas-phase buffer chamber, gas-phase equilibrium chamber, gas-phase communication pipe, cyclone inlet ring, high-efficiency cyclone, double-phase separation head cylinder, gas-liquid annular channel, liquid-phase annular channel, middle Diversion tube, isolation nipple, diversion pipe section, liquid phase intermediate ring; multi-value shared data head includes fixed value V-groove flowmeter, differential pressure die box, double flange differential pressure transmitter, mechanical pressure gauge, Gas-phase sampling mechanism, bimetal thermometer, differential pressure transmitter, pressure transmitter, temperature transmitter, fixed-value nozzle flowmeter, flow computer, dual-channel correlation regulator, data module body, mixed-phase outlet pipe fittings, liquid-phase sampling mechanism. The above-mentioned components are highly integrated. In addition to the efficient separation of the wet gas two-phase flow, the subsequent gas-liquid two-phase flow measurement with a wide range ratio is more innovative. The two-phase separation head ensures the gas-liquid two-phase flow. Separation effect, while the multi-value shared data head implements accurate metering of gas-liquid two-phase flow.

The invention is based on the dual-phase separation head at the front end of the wet gas online metering device. When the wet gas (mixed gas such as natural gas and shale gas) enters the high-efficiency cyclone inlet ring along the wet gas inlet pipe fitting and the gas-liquid annular channel, the cyclone The inlet ring divides the airflow into the high-efficiency cyclone, and uses the centrifugal force and the gas-liquid density difference to complete the separation of the gas phase and the liquid phase. The wire mesh demister, and then enters the gas phase buffer chamber at the top, and the buffered gas phase flows down along the gas phase center pipe; the separated liquid phase directly enters the lower guide pipe section and the inner wall of the gas phase center pipe through the liquid phase annular channel. the annular space.

The invention is based on the multi-value shared data head at the back end of the wet gas online metering device. When the separated gas phase enters the data module body along the gas phase central pipe; the same separated liquid phase also enters the data module body along the liquid phase intermediate ring. , the gas phase and the liquid phase pass through the fixed-value nozzle flowmeter and the fixed-value V-shaped groove flowmeter installed on the data module body to complete the online measurement of the gas-liquid two-phase flow, respectively, and the measured two-phase flow enters the dual-channel associated regulator. The dual-channel associated regulator compares the variation of the differential pressure of the two-phase flow with the pre-set value to complete the balance adjustment of the differential pressure parameters of the two channels, and the adjusted gas phase and liquid phase are output along the mixed-phase outlet.

The invention is based on the swirl sub-inlet ring in the dual-phase separation head, and 3 to 6 vortex arcs with narrow gaps can be set. The flow velocity and manifold in the flow cylinder, thus reducing the ability of the gas to entrain liquid particles and reducing the possibility of large particle droplets being re-atomized. Gas-liquid separation effect, this innovation has a prominent role in breaking the impact of short plug flow.

The invention is based on the high-efficiency cyclone of the dual-phase separation head, and a limited number of cyclone cones are arranged around the gas-phase central pipe. The phase flow numerical simulation software is used to determine the separation effect of the gas phase and the liquid phase under different working conditions.

Compared with the prior art, the following technical effects can be achieved by adopting the design scheme of the present invention:

1. The wet gas online metering device can be designed according to API6A to ensure the compact structure of the entire device. Its highly integrated technology not only simplifies the gathering, transportation and metering process, but also minimizes one-time engineering investment.

2. According to the implementation of this technical solution, whether it is the measurement of gas phase or liquid volume, the measurement range ratio of the configured instrument can reach more than 100:1, which is regarded as the parallel installation of multiple differential pressure flow meters of different diameters, so as to effectively solve the problem. It solves the problem of continuous and accurate measurement of instruments with large changes in working conditions.

3. The multi-value shared data head centrally shares the relevant detection and measurement parameters into a data module to complete gas flow measurement, liquid flow measurement, pressure and temperature detection and dual differential pressure online tuning and adjustment. This integrated technology is unprecedented.

Description of drawings

Figure 1-2 is the structure diagram of the moisture online metering device.

Description of drawing numbers

A1…Double-phase split header A2…Multi-value shared header

1…Moisture inlet pipe fittings 2…Wire mesh demister 3…Gas phase central pipe

4…Gas phase buffer chamber 5…Gas phase equilibrium chamber 6…Gas phase connecting pipe

7…Swirler inlet ring 8…High-efficiency swirler 9…Double-phase separation head barrel

10…Gas-liquid annular channel 11…Liquid-phase annular channel 12…Intermediate guide tube

13…Isolation sub 14…Drain pipe section 15…Liquid phase intermediate loop

16…Fixed value V-groove flowmeter 17…Differential pressure die box 18…Double flange differential pressure transmitter

19…Mechanical pressure gauge 20…Gas phase sampling mechanism 21…Bimetal thermometer

22…Differential pressure transmitter 23…Pressure transmitter 24…Temperature transmitter

25…Fixed Nozzle Flowmeter 26…Flow Computer 27…Two-Channel Correlation Regulator

28…Data module body 29…Mixed phase outlet pipe fittings 30…Liquid phase sampling mechanism.

Detailed ways

The moisture online metering device of the present invention will be described in further detail below with reference to Figures 1-2 of the accompanying drawings.

The moisture online metering device of the present invention, please refer to Figures 1-2, including a dual-phase separation head A1, a multi-value shared data head A2, a moisture inlet pipe fitting 1, a wire mesh demister 2, a gas-phase central pipe 3, and a gas-phase buffer Chamber 4, gas phase balance chamber 5, gas phase communication pipe 6, cyclone inlet ring 7, high-efficiency cyclone 8, dual-phase separation head cylinder 9, gas-liquid annular channel 10, liquid-phase annular channel 11, intermediate guide tube 12. Isolation short section 13, diversion pipe section 14, liquid phase intermediate ring 15, fixed value V-groove flowmeter 16, differential pressure die box 17, double flange differential pressure transmitter 18, mechanical pressure gauge 19, gas phase Sampling mechanism 20, bimetal thermometer 21, differential pressure transmitter 22, pressure transmitter 23, temperature transmitter 24, fixed-value nozzle flowmeter 25, flow computer 26, dual-channel correlation regulator 27, data module body 28 , Mixed phase outlet pipe fittings 29 , liquid phase sampling mechanism 30 . During normal use, when wet gas (mixed gas such as natural gas and shale gas) enters the high-efficiency swirl sub-inlet ring 7 along the wet gas inlet pipe fitting 1 and the gas-liquid annular channel 10, the swirl sub-inlet ring 7 equalizes the airflow. Divided into the high-efficiency cyclone 8, and the separation of the gas phase and the liquid phase is completed by the centrifugal force and the difference in gas-liquid density. The demister 2 then enters the gas phase buffer chamber 4 at the top, and the buffered gas phase flows down along the gas phase center pipe 3; the separated liquid phase directly enters the lower guide pipe section 14 and the gas phase through the liquid phase annular channel 11 down The annular space of the inner wall of the central tube 3.

The moisture online metering device of the present invention, please refer to Fig. 1-2, the innovative multi-value shared data head, when the separated gas phase enters the data module body 28 along the gas phase central pipe 3; the same separated liquid phase, along the liquid phase The phase intermediate loop 15 also enters the data module body 28 at the same time, and the gas phase and the liquid phase pass through the fixed-value nozzle flowmeter 25 and the fixed-value V-shaped groove flowmeter 16 installed on the data module body 28 to complete the online gas-liquid two-phase flow respectively. The measured two-phase flow enters the dual-channel associated regulator 27, and the dual-channel associated regulator 27 compares the variation of the differential pressure of the two-phase flow with the preset value to complete the balance adjustment of the two-channel differential pressure parameters. The conditioned gas phase and liquid phase are output along the miscible outlet pipe 29 .

For the moisture online metering device of the present invention, please refer to Figure 1-2. The innovative swirl sub-inlet ring 7 can be set with 3 to 6 vortex arcs with narrow gaps. When flowing in, the flow rate and manifold of the fluid in the high-efficiency swirl element 8 can be effectively controlled, thus reducing the ability of the gas to entrain liquid particles, reducing the possibility of large particle droplets being re-atomized, and the narrow gap between the vortex arcs is evenly divided. The principle is to overcome the hazards of sudden manifold, and to ensure the effect of gas-liquid separation. This technological innovation has a prominent role in cracking the impact of short plug flow.

For the wet gas online metering device of the present invention, please refer to Figures 1-2. The innovative high-efficiency swirl element 8 is arranged in a circle around the gas phase central pipe 3 with a limited number of swirl cones. , Design flow and allowable pressure drop are determined by Fluent two-phase flow numerical simulation software, which can ensure the separation effect of gas phase and liquid phase under different working conditions.

The above only describes several specific examples in the present invention, but they cannot be regarded as the protection scope of the present invention. Any equivalent changes or modifications made according to the design spirit of the present invention, or proportional enlargement or reduction, etc., should be considered to fall within the scope of the present invention. into the protection scope of the present invention.

Claims (5)

1. An online metering device of moisture, its characterized in that: the system is mainly formed by connecting two core component double-phase separation heads and a multi-valued shared data head in series, wherein the double-phase separation heads comprise a moisture inlet pipe fitting, a wire mesh demister, a gas-phase central pipe, a gas-phase buffer chamber, a gas-phase balance chamber, a gas-phase communicating pipe, a cyclone inlet ring, a high-efficiency cyclone, a double-phase separation head cylinder body, a gas-liquid annular channel, a liquid-phase annular channel, a middle guide cylinder, an isolation short section, a guide pipe section and a liquid-phase middle annular channel; the multi-value shared data head comprises a constant value V-shaped groove flowmeter, a differential pressure die box, a double-flange differential pressure transmitter, a mechanical pressure gauge, a gas phase sampling mechanism, a bimetallic thermometer, a differential pressure transmitter, a temperature transmitter, a constant value nozzle flowmeter, a flow computer, a double-channel associated regulator, a data module body, a mixed phase outlet pipe fitting and a liquid phase sampling mechanism.

2. A dual phase separation head as recited in claim 1, wherein: moisture (mixed gas such as natural gas, shale gas and the like) enters the high-efficiency cyclone inlet ring along the moisture inlet pipe fitting and the gas-liquid annular channel, the cyclone inlet ring equally divides gas flow into the high-efficiency cyclone, the gas phase and the liquid phase are separated under the action of centrifugal force and gas-liquid density difference, the separated gas phase enters the gas phase balance chamber through the gas phase communicating pipe, passes through the wire mesh demister after being uniformly distributed, and then enters the gas phase buffer chamber at the top, and the buffered gas phase flows downwards along the gas phase central pipe; the separated liquid phase directly passes through the liquid phase annular channel and downwards enters an annular space between the lower diversion pipe section and the inner wall of the gas phase central pipe.

3. A multi-valued shared data header as recited in claim 1, wherein: the separated gas phase enters the data module body along the gas phase central tube; the separated liquid phase enters the data module body along the middle loop of the liquid phase at the same time, the gas phase and the liquid phase pass through a fixed value nozzle flowmeter and a fixed value V-shaped groove flowmeter which are arranged on the data module body to respectively complete the online metering of gas-liquid two-phase flow, the metered two-phase flow enters a two-channel associated regulator, the two-channel associated regulator completes the balance regulation of the differential pressure parameters of the two channels according to the comparison of the variable quantity of the differential pressure of the two-phase flow and a preset given value, and the regulated gas phase and the regulated liquid phase are output along a mixed phase outlet.

4. The swirl inlet ring recited in claim 1 wherein: can set up 3 ~ 6 vortex arc pieces that have narrow gap, when the air current with certain speed down along the even tangential inflow of axial, can the effective control fluid velocity and the manifold in the whirl section of thick bamboo, therefore reduce gaseous liquid particle ability of smuggleing secretly, reduce the possibility that large granule liquid drop is atomized again, the even reposition of redundant personnel principle of narrow gap between the vortex arc piece and overcome the harm of sudden change manifold, the effect of gas-liquid separation has been ensured again, this innovation has outstanding effect in the impact of breaking short plug flow.

5. The high efficiency swirler as recited in claim 1, wherein: a limited number of cyclone cone barrels are arranged around a gas phase central pipe in a circumferential mode, the specification and the number of the cyclone cone barrels can be determined through Fluent two-phase flow numerical simulation software according to working condition pressure, design flow and allowable pressure drop, and therefore the separation effect of a gas phase and a liquid phase under different working conditions can be guaranteed.

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