SU1404090A1 - Installation for catching light fractions - Google Patents

Abstract

The invention relates to a light fraction trapping facility and can be used in the oil and gas industry. The aim of the invention is to reduce capital. operational costs and increase safety and reliability of operation. The installation contains a trailer separator, a vertical gas separator, tanks, a buffer tank with a gas line, a compressor, a flame arrester. Gas tanks are vertically installed in the tanks. Their lower ends outside the tanks are provided with valves and are connected to a discharge gas pipeline. The flame arrester is installed in the upstream section of the gas line of the buffer tank, and the compressor outlet is connected to the separator. 1 PC. from 9 (L

Description

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The invention relates to the oil and gas industry, namely to installations for collecting light fractions from tanks and low-pressure apparatuses.

The purpose of the invention is to reduce capital and operational costs and to increase safety and reliability of operation.

The drawing shows a schematic diagram of the installation for the collection of light fractions.

. The installation includes a supply pipe 1, an end separator 2 connected by a pipe 3 to a vertical gas separator 4, the lower zone of which is connected to the lower zone of the tanks 5. The latter are equipped with gas discharge pipes 6 installed vertically and to the entire height inside the tank. the lower end of which, at the point of exit from the tank, is made obliquely, is provided on the outside of the tank with a valve 7 and is connected to a discharge gas pipeline 8 connecting the separator 4 to the buffer tank — condensate collector 9. Upper The tank 9 is connected to the compressor 11 by a gas line through the fuse 10 to & it, in turn, by pipeline 12 - with separator 2. The lower part of the tank 9 is connected to the pump 13. Reservoirs 5 are equipped with drain pipes of water 14 and oil 15 with valves 16. Flue gas pipes 6 in the upper part of the perforated unit The installation contains a branch 17, common gas line 18, dry gas feed line 19, sensors 20 and 21, breathing valve 22

. The installation works as follows.

Watered well production after the end separation stage enters the vertical gas separator 4 and then into the reservoirs 5, from which the preliminary water is discharged and the subsequent distribution of oil flow through pipelines 15 between the oil preparation. Free reservoir water through pipelines 14 is discharged to the treatment plant. The gas from the gas separator 4 and the lungs in the tanks (the fractions through the gas sampling pipes 6 enter the exhaust gas pipeline 8, and from there through the common valve 16).

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into the buffer tank 9. From the latter, the gas enters the compressor intake 11 and, after compression, is fed through conduit 12 to the separation stage to extract the main volume of condensate from it. During repair and other works, gas can be supplied via the outlet 17 and into the general gas pipeline 18. In case of emergency overflow of the tanks, the oil through the gas sampling pipes 6 and through the gas pipeline 8 enters the tank 9, from where it is pumped out by the pump 13 to the installation for its preparation.

The pressure in the tanks is at a given level (40–200 mm water column), the compressor is turned on and off, the pump, the dry gas feed line 19 of the tanks is carried out using sensors 20 and 21. The emergency exit of gas is carried out through the breathing valve 22.

In the proposed installation, the direction of gas, condensate and oil (with threats of overflow) coincide in all parts of the prefabricated pipelines, which makes it more reliable and flexible in operation and allows for multi-purpose use of the same communications and equipment.

Improving the safety and reliability of the installation is ensured by the fact that there are no outdoor gas gathering pipelines, KJDTOs, as a rule, are mounted in the inter-reservoir space at a certain height with a bias towards the condensate collector to free the condensate from the gas gathering pipelines. These gas collection pipelines are subject to temperature, wind, and snow loads, which lead to their destruction or blockage with ice. As a result, the normal operation of the installation is disrupted. In the proposed installation, these disadvantages are eliminated.

The installation also allows autonomously disconnecting individual tanks during emergency and repair work, which is achieved by switching input and output valves on each of them, eliminating overflow of oil when tanks are refilled, and prevents the occurrence of crystalline hydrates in reducing pipelines, which reduces operating costs by 48%.

The exception of crystalline hydrates is ensured by the fact that in the proposed installation the gas sampling nozzles are located inside the tank, where the temperature of the oil and gas space, even at the lowest negative ambient temperature, is not lower due to the constant flow of oil with a higher temperature (+ 15-20 s ).

The ability to disconnect each of the tanks while the others are working is achieved by individually equipping each of the tanks with shut-off valves. All tanks in this case is equivalent to number 1.

In the event of emergency situations (overflows), gas inlets are used as oil diversion pipelines. In the proposed installation, in case of an emergency level increase, the oil is directed through the gas sampling pipe to the condensate collector, from where it is pumped to the oil pipeline. The presence of valves makes it possible to connect and disconnect a certain number of tanks in the technological cycle, to prevent condensate from being selectively prevented. When such a gas is directed to a separator, the lighter gas is mixed with a ton of jelly and a large amount of condensate is eliminated. The use of vertical nozzles inside the tank and their connection to the exhaust gas pipelines through the separator allows for the forced removal of gas and enhances the safety and reliability of servicing the gas collection lines.

Claims (1)

Invention Formula A light fraction capture unit containing an end separator, tanks, a vertical gas separator, a gas line buffer tank, a compressor, a pump, oil, gas and water supply and discharge pipelines, devices and devices supporting the automatic mode of operation of the installation, and a flame arrester, characterized in that, in order to reduce capital and operating costs, increase safety and reliability of operation. Tical inspections, individually selected, it is equipped with gas sampling nozzle gas samples. Instead of multiple fire arrestors, there was only one left at the outlet of the buffer tank. Connecting the compressor outlet to the separator avoids condensate formation in pressure gas lines. The gas taken from the tanks has a density in the order of 2 kg / m and when compressed in gas pipelines five Mounted vertically inside tanks, the lower end of which is provided on the outside of the tank with a locking element and is connected to a discharge gas pipeline, the fire safety device is installed in the upstream portion of the gas line of the buffer tank, and the compressor outlet is connected to the separator. / V n