SU1139812A1 - Arrangement for preventing freezing of blind water lines - Google Patents

Abstract

1. DEVICE OF MILLING PREVENTION OF FREEZING OF CUPPING PIPELINES, containing a pump with suction and pressure main pipelines, stub pipe with a water outlet, switching devices, and a battery for returning water, which is in a ra- ter pattern, a pattern, a ra- cine, a template, a template, a ra- cine, a template, a template, a w / w-w / w. it is equipped with a pipeline with a valve, one end. Which is connected to a dead-end pipeline, and the other end - to the suction pipe of the pump, with This battery for the reverse movement of water is made in the form of a heat-insulated chamber, 2. The device according to claim 1, is based on the fact that the battery for the reverse movement of water in the field. dr about p ne e vm a t ich e with them,

Description

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The invention relates to devices for preventing freezing of water in dead-end pipelines laid under the conditions of permafrost, and is used in the system for maintaining reservoir pressure in the northern gas-oil fields.

A device for preventing freezing is a dead end; from pipelines, it is a branch of a water supply network in the form of a loop connected to a main pipe to form a closed pipe in which water flows (its circulation) is maintained due to the difference in pressure heights that occurs when water moves in the Venturi tube (built into the main pipeline) at its two points from which the L1 outlets are made.

The application of this technical solution in the arrangement of a gas-oil field is inefficient and uneconomical, since it requires the laying of two water lines to one well, which significantly increases capital costs and operating costs.

To increase the reliability of the water supply system, it is possible to minimize the thermal losses of pipelines; ensuring the continuous movement of water in conduits; installation of water heating facilities both in the places of the water supply and in the whole length of the conduit; organization of control over the hydraulic and thermal conditions

However, it is not possible to investigate the listed measures for underground dead-end pipelines in the conditions of gas and oil fields when the water pipeline stops.

Closest to the present invention, there is a device for preventing deadlines in pipelines from freezing, comprising a pump with suction and pressure lines, connected to a main pipeline, a dead-end pipe with a water outlet, switching devices and a battery for reverse movement of water 2.

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A disadvantage of the known solution is complexity and non-reliability.

The purpose of the invention is to increase reliability and simplify the design.

The goal is achieved by the fact that the device for preventing the freezing of dead-end pipelines, containing a pump with suction and main pipelines, connected to the main pipeline is a dead-end pipe with water supply 5p, switching devices and a battery for reverse water movement, equipped with a pipeline with a valve, one end of which connection to the dead-end pipeline, and the other to the pump suction pipeline, while the accumulator for the reverse movement of water you olnen a thermally insulated chamber.

In addition, the battery is made hydropneumatic.

The drawing shows a schematic of the device for preventing dead-end pipelines from freezing. I

The device includes a well 1, a valve 2, a dead-end pipeline 3, a valve i4, an accumulator 5 for returning water, a valve 6, a water pump 7, wells 8 and 9, a pump 10 with suction 12 and pipelines Ie. IbHbfri 11 pipelines, pipeline 13 with a valve 14,

When water is pumped into the reservoir to maintain: 1, the formation pressure of the device operates as follows.

During normal operation of the water injection system, valves 2 and 6 are open, and valves 4 and 14 are closed. When an emergency situation is created in well 1, the control: and 6 is closed, and the valve 14 is opened. In this case, the dead-end pipeline 3 is connected to the suction pipe 12 of the pump 10 and the reservoir (heated to approximately 50 ° C) water flows from the well 1 through the pump 11 to the wells 9 and 8, i.e. there is a replacement of the formation water before the accident. Then the valves 2 and 14 are closed, and the valves 4 and open. At the same time, the air in the accumulator 5 is compressed by the water coming from the pipeline 3 and the potential energy is accumulated. Further, the valve 6 closes, and the valve 14 opens and the water in the dead-end pipe 3 moves in the opposite direction from the accumulator 5 to the intake pipe 12 of the pump 10. In this case, the accumulated potential energy passes into the kinetic energy of the flow and in accordance with this hydrodynamic friction forces. Further, the device works in the same way as described. When laying water pipelines on oil and gas fields in conditions of permafrost soil distribution under certain technological conditions, internal glaciation of the pipeline occurs, which, as is known, can cause destruction. 4 Especially unfavorable conditions occur during emergency shutdown of the water conduit. In order to ensure further normal operation of the pipeline, it is necessary to carry out repair work before the start of ice formation. In particular, the time before the start of ice formation for a pipeline of 00.15 m, laid in the ground with a temperature of -6 ° C and an initial water temperature of 1 ° C. to a depth of 2 m, it is 5 hours. It takes 24 hours to carry out repair work. Thus, there is a need to increase the time before the start of ice formation. The proposed technical solution will allow reducing the pipeline laying depth by 50-60% without changing its operational characteristics.

Claims (2)

1. DEVICE FOR PREVENTION OF FREEZING OF BLACK PIPELINES, containing a pump with a suction and pressure main pipelines, a dead end piping connected to the main pipeline with a water intake, switching devices and a battery for reverse movement of water, irradiating with the fact that in order to increase the reliability of operation and simplify the device, it is equipped with a pipeline with a valve, one end of which is connected to a dead end pipe, and the other to a suction pipe of the pump, when The battery for the reverse movement of water is made in the form of a thermally insulated chamber. 2. · The device according to claim 1, wherein the battery for the reverse movement of water is made hydropneumatic. cl