Protective device for measuring instruments

 

The invention relates to the field of measurement technology and is intended for use in the oil and gas industry. The invention is directed to provide performance measurement systems pressure and/or flow rate of the moisture-saturated gas in horizontal pipelines onshore gas collection systems at negative ambient temperatures by preventing the formation of impermeable tubes of ice and gas hydrates in the pipe that connects the technological pipeline with a device that measures the gas pressure or flow rate. Protective device for measuring devices includes made in the form of a hollow cylinder body with technological hole, over which the tide is attached to the housing and provided with a bypass comprising interconnected input and output taps. The output power drain is located above the processing hole in the casing and provided with a connecting pipe for connecting the measuring device, and the input tap and the outer surface of the tide is thermally insulated. The outer surface of the output of the allotment and/or outer surface of the housing, beneath the tide, made with fins. Soedinenii the connection for the measuring device, the measuring device and the portion of the body under them posted in the heat-insulated casing, the section of the body under cover made with fins. The outer surface of the housing located on the opposite side from the tide, and not closed to them, equipped with thermal protection. In the housing in the plane of the holes perpendicular to the axis of the pipeline, symmetrically with respect to the center performed an additional drain holes. In the cavity of the tide above the processing hole posted by permeable mesh nozzle. 7 C.p. f-crystals, 9 Il.

The invention relates to oil and gas industry and can be used, in particular, to ensure the health (functional) systems measure pressure and/or flow rate of the moisture-saturated gas in horizontal pipelines onshore gas collection systems at negative ambient temperatures.

For measuring pressure of the moisture-saturated gas is known a device used to control the mode of operation of the wells containing vertically placed tube, the lower end connected to the horizontal technological pipeline, on the upper end of which time the education impermeable sealed tube in the channel to the gauge of ice or gas hydrates at negative ambient temperatures (see, for example, Gritsenko, A. I., H. Aliyev S., Ermilov O. M., Remizov C. C., Zotov, A. Guide the exploration wells. - M.: Nauka, 1995, S. 17, 468, 502).

It is also known a device for sampling gas, comprising a connector and a pulse tube in which the gas pressure is transmitted to chamber pressure gauges. When measuring pressure wet gas connecting lines and impulse tubing is recommended to install settling vessels.

The main disadvantage of this device is the formation of sealed ice or hydrate plugs in the channel to a pressure gauge at negative ambient temperatures (see, for example, Rules for flow measurement of gases and liquids standard constriction devices. RD 50-213-80. - M., 1982, S. 56-61).

The closest to the technical nature of the claimed device is selected as a prototype, a protective device for instruments measuring pressure containing condensation chamber, mounted on a vertical pipe, in which water vapor from the gas condenses on a limited part of the inner surface of the chamber, cooled by the surrounding air.with. The USSR №337673. Protective device for a differential pressure gauge, published 05.05.1972, BI No. 15). Give the I education in the connecting piping to the meter hydrate and ice jams when using horizontally placed on the pipeline, what makes inefficient system for measuring pressure or gas flow in horizontal pipelines onshore gas collection systems.

The primary object of the present invention is the provision of health devices for measuring parameters (pressure, flow) the moisture-saturated gas flow in a horizontally placed technological pipeline onshore gas gathering system, at negative ambient temperatures by preventing the formation of impermeable tubes of ice and gas hydrates in the pipe connecting process piping with a device that measures the gas pressure or flow rate.

This objective is achieved in that a protective device for measuring devices, including made in the form of a hollow cylinder body with technological hole, over which the tide is attached to the housing and provided with a bypass comprising interconnected input and output taps, according to the invention, the output drain is located above the processing hole in the casing and provided with a connecting pipe for connecting the measuring device, and the input tap and the outer surface of the tide equipped with teploizolirovan, can be done with the ribbing. The connection for the measuring device can be made oblique to the output of the disqualification and together with the measuring device and the area of the body is placed in the heat-insulated casing, the section of casing below the casing can be accomplished with fins. The outer surface of the housing located on the opposite side from the high tide and not closed to them, can also be equipped with thermal protection. In the housing in the plane of the holes perpendicular to the body axis, symmetrically with respect to the center can be made more drainage holes, and in the cavity of the tide above the processing hole can be placed permeable mesh attachment.

In Fig.1 in sectional view schematically showing a protective device for measuring equipment;

in Fig.2 shows a cross-section of a protective device for measuring instruments a-a of Fig.1;

in Fig.3 shows a cross-section of a protective device for measuring devices along B-B of Fig.1;

in Fig.4 shows a cross-section of a protective device for measuring devices In Fig.1;

in Fig.5 schematically shows a variant of placement and design perform simultaneously two protective devices for Uchenie protective device for measuring instruments a-a of Fig.5;

in Fig.7 shows a cross-section of a protective device for measuring devices along B-B of Fig.5;

in Fig.8 shows a cross-section of a protective device for measuring devices In Fig.5;

in Fig.9 shows the form A (top) a protective device for measuring instruments Fig.5.

Protective device (Fig.1) for measuring instrument consists of a housing 1 made in the form of a hollow cylinder (pipe section), with the technological hole 2, on which is fixed to the body 1 burst 3. The rush 3 is equipped with a bypass consisting of two inter-connected outlets - input 4 and output 5, located above the processing hole 2. The bypass can be placed parallel to the axis of the housing. Output outlet 5 provided with a connecting pipe 6 for connecting the measuring device 7, while the connecting pipe 6 is made oblique to the output tap of 5. The outer surface of the tide 3 and input the outlet 4 can be provided with insulation 8. The outer surface of the output of the outlet 5 can be performed with fins 9 and the outer surface of the housing 1 located under the tide 3 can also be performed with fins 10. Pipe 6, the measuring device 7 and the portion of the housing 1 under the mouth 11 can be performed with the fins 12. The outer surface of the housing 1 located on the opposite side from the high tide 3 and not closed, may be provided with insulation 13. In the housing 1 in the plane of the apertures 2, perpendicular to the body axis, symmetrically with respect to the center can be made more drainage holes 14 for draining condensed from gas to liquid in the cavity of the housing 1. Above the processing hole 2 in the cavity tide 3 can be placed permeable mesh nozzle 15.

Protective device (Fig.5) for connection to a single technological pipelines of the two measuring devices or a single differential pressure gauge on the same horizontal pipeline with the aim of determining the gas flow consists of a housing 1 with two holes 2 located under the two tides 3. The location of the holes 2 along the body is determined by the requirements of the design orifice, such as orifice or Venturi tubes. In Fig.5 shows a variant of the proposed use of the protective device in conjunction with a Venturi pipe. One hole 2 is located before narrowing device, and the second hole 2 is located in a constriction in the channel with the smallest diameter. Razmeshaw.

Protective device for the measuring runs into a horizontal pipeline onshore gas gathering system so that the input tap 4 held vertical or sub-vertical position, the device operates as follows.

From the process piping warm, saturated with moisture, the gas enters into embedded in the pipe body 1, and then through technological hole 2 in the cavity of the tide 3. The gas fills the interior cavity of the tide 3 and branch 4 and 5. The temperature of the gas in the cavity formed by the tide 3 and the surface of the processing pipeline, due to the flow of warm gas through the housing 1 and through the insulation 8, is maintained at the temperature of the pipe wall and the casing 1.

Warm wet gas climbs insulated inlet to the outlet 4, the temperature decreases due to heat transfer with the surrounding air. The output tap of 5 gas flows from the inlet to the outlet 4 at a temperature slightly above the ambient temperature. In the output tap 5, the gas is cooled by heat exchange with the environment to the ambient temperature. On the inner surface of the cavity of the branches 4 and 5, the water vapor condenses in the form of ka the periods 4 and 5 to the outer surface of the housing 1, through technological hole 2 gets into the inside of the housing 1 and is carried away by the gas flow. Additional drain holes 14 in the housing 1 substantially reduce the likelihood of accumulation of condensed liquid in the cavity of the tide 3.

The temperature downstream of the gas in the cavity output drain 5 is reduced, and the density of the gas increases. Cooler gas (higher density) will tend to descend on the output tap of 5, i.e., the downward flow of cold dry gas will prevent the flow counter flow of warm moist gas from the cavity tide 3 in the cavity downstream of the outlet 5. Thus, a redistribution of the flow - area of natural circulation by convection. In addition, when the contact of cold gas down the output tap of 5, with warm gas flowing through the opening 2 and the surge of 3 to the output tap of 5, moisture condensation, and additional gas is drained.

If the above technological hole 2 in the cavity tide 3 installed permeable mesh nozzle 15, the process of condensation of the gas is accelerated due to the fact that part of the nozzle 15 is washed by the warm gas flowing through the opening 2, and the top of the 5, contribute to the more rapid cooling of the gas in the cavity output tap of 5 because of the increased surface heat exchange with the surrounding air.

Longitudinal ribs 10 on the surface of the housing 1 in the cavity tide 3 and the insulation 8, covering the input tap of 4 and burst 3 help to keep the gas temperature is higher than ambient temperature. In addition, the supply of the outer surface area of the hull, not closed by the tide, and on the opposite end, the insulation 13, the arrangement of connecting pipe 6 with the measuring device 7 and part of the building in the heat-insulated casing 11, as well as the implementation part of the building under the cover with transverse fins 12 allows to keep warm and to prevent the formation of ice or hydrates in the connecting pipe 6. Thus, in the connection pipe 6 to the measuring device 7 is supplied to only the dried (dehydrated) of the gas.

The implementation of the connecting pipe 6 with a slope towards the outlet 3 excludes drip liquid into the chamber of the measuring device.

When used on horizontal pipeline two proposed devices complete with a narrowing device (for example, a Venturi pipe) is Arturo ambient air to determine the gas flow. In this case, on the part of the technical pipeline is a narrowing device type Venturi tubes with two holes in the direction of gas flow. One hole is located in front of a narrowing device, and the other hole is located in the channel with the smallest diameter.

Using the proposed protective device in socket for connection to a measuring device receives only the dehydrated portion of the gas eliminates the formation of impermeable deaf ice or hydrate plugs in the pipes to appliances, which ensures high performance measurement systems mode of operation of the pipeline, such as from wells, at negative ambient temperatures.

Claims

1. Protective device for measuring devices, including made in the form of a hollow cylinder body with technological hole, over which the tide is attached to the housing and provided with a bypass comprising interconnected input and output taps, wherein the output tap is located above the processing hole in the casing and provided with a connecting pipe for the Sabbath.

2. Protective device under item 1, characterized in that the outer surface of the output tap is made with ribbing.

3. Protective device according to any one of paragraphs.1 and 2, characterized in that the outer surface of the housing, beneath the tide, made with ribbing.

4. Protective device according to one or more of the paragraphs.1-3, characterized in that the connecting pipe for connecting the measuring device is made oblique to the output row.

5. Protective device according to one or more of the paragraphs.1-4, characterized in that the connecting pipe for connecting the measuring device, the measuring device and the portion of the body under them posted in the heat-insulated casing, the section of the body under cover made with ribbing.

6. Protective device according to one or more of the paragraphs.1-5, characterized in that the outer surface of the housing located on the opposite side from the tide, and did not cover them with insulation.

7. Protective device according to one or more of the paragraphs.1-6, characterized in that the housing in the plane of the holes perpendicular to the axis of the pipeline, symmetrically with respect to the center performed additional drainage othertechnologies hole posted by permeable mesh nozzle.

 

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