RU2713310C1 - Method of preventing oil supply to the main pipeline, which does not correspond to the standardized quality indicators - Google Patents

Abstract

FIELD: transportation; oil and gas industry.

SUBSTANCE: invention relates to the field of pipeline oil transportation and can be used in operations of receiving oil in the main oil pipeline. Method comprises a technology of shutting supply pipeline connected to main pipeline, dislodging from connected pipeline off-grade oil using bypass pipeline, mechanical separator, compressor connected to starting chamber, connected and supply gate valves, initial and final bypass gate valves.

EFFECT: disclosed is a method of preventing oil from entering the main pipeline, which does not correspond to standardized quality indices.

1 cl, 3 dwg

Description

The invention relates to the field of main pipeline transport of oil and can be used when performing operations for receiving oil into the main oil pipeline.

Currently, oil is admitted to the main oil pipeline at special points equipped with technical means and devices that determine the quantity and quality indicators of oil. The urgency of the problem associated with the consequences of oil inflow into the main pipeline that does not meet the standardized quality indicators is exacerbated by the volume and nature of technical, operational and economic risks and unjustified costs for all entities involved in the transportation of oil through main pipelines and its processing at destination points.

When considering the technical literature most closely related to the method of preventing oil from entering the main pipeline that does not meet standardized quality indicators, the following series of technical solutions were identified.

A known method of measuring quality indicators of petroleum products, consisting in the fact that several samples of petroleum products are selected with reference values of the determined quality indicator, the measuring instruments are calibrated by appropriate indirect measurements of electrophysical parameters in the selected petroleum product samples, the same indirect measurements of the set of electrophysical parameters of the controlled petroleum product are carried out and determined the required indicator of the quality of the controlled oil product by cut the results of indirect measurements using the calibration model of the measurement process by comparing the reference values of the determined quality indicator in the selected petroleum product samples with counts of the set of indirect measured electrophysical parameters (patent for invention RU 2227320, class G06F 17/12, G01N 33/22, publ. 20.04 .2004, bull. No. 11).

Known stationary system for measuring the quantity and quality indicators of oil, containing input and output collectors connected to the main pipeline, valves, block measuring lines, including working and at least one control and backup measuring lines with installed liquid flow meters, an additional collector for connection to the installation of verification of flow meters, a sampling device located in a heated room, a unit for monitoring oil quality parameters with a device for manual sampling, by pumps and an analyzer, a drainage system with drainage collectors of recorded and unaccounted oil, a system for collecting, processing information and control, pumps equipped with variable frequency drives, filters at the inputs of measuring lines and control units for oil quality parameters, electric regulators at the outputs of the measuring lines (patent for utility model RU 142735, class G01F 1/00, publ. 06/27/2014, bull. No. 18).

A common drawback of these technical solutions is the lack of technological and constructive capabilities to prevent substandard oil from entering the main pipeline after it passes through technical means and devices that determine its quantitative and qualitative indicators.

Closest to the claimed invention is a method of sequential pumping of oil of different quality, which consists in supplying the main stream of oil of one quality to the pipeline and pumping it by direct contact with a batch of oil of a different quality, measuring the oil parameters at the receiving point by taking oil from zones in beginning and end of the batch from a mixture of mainstream oil and batch oil with intermediate sulfur content, separately from oil in the middle zone of the batch with a different sulfur content (patent for f RU 2277201, cl. F17D 3/03, publ. 27.05.2006, at Bull. №15).

The disadvantages of this method are:

the difficulty of achieving uniformity of the quality indicators of the mixture from various lots of oil in the limited space of the pipeline into which these lots of oil are taken;

the difficulty of ensuring the minimum acceptable indicators of the quality of the mixture of oils when they are pumped through the main pipeline, satisfying the needs of consumers;

there is a high likelihood of substandard oil entering the main pipeline, which can lead to failures in the process of pumping it, high costs of emptying, cleaning and refilling the pipeline, causing economic damage to all entities involved in transporting oil through main pipelines and their processing at destination points.

The problem solved in the invention is to eliminate these drawbacks by applying a method that prevents the reception of oil in the main pipeline that does not meet standardized quality indicators, and reduces the technological, technical and economic risks from pumping substandard oil.

The technical result of the invention is to increase the efficiency of processes to ensure the required level of oil quality when it is received in the main pipeline.

The problem is solved, and the technical result is achieved as a result of the fact that the way to prevent oil from entering the main pipeline that does not meet the standardized quality indicators is that:

- a section of the connected pipeline connected to the oil quality measuring unit, and a section of the supply pipeline between the oil quality measuring unit and the main pipeline are connected by a bypass pipe equipped with a start chamber with a compressor connected to it;

- the connecting and supply pipelines are provided with the connecting and supply valves, respectively, and at the beginning and end of the bypass pipeline, the start and end bypass valves are installed, respectively;

- to ensure unimpeded flow of oil into the main pipeline that meets the standardized quality indicators, the initial and final bypass valves are brought into the closed position, and the connected and supply valves into the open position;

- when the oil quality measuring unit automatically detects the fact that oil passes through it that does not meet the standardized quality indicators, the corresponding signal in the automatic mode is alternately sent to the pump installation of the connected pipeline, to the connected, supply, initial and final bypass valves;

- alternately in automatic mode, perform the following actions: turn off the pump installation of the connected pipeline, close the supply and connect valves, open the initial and final bypass valves;

- close the initial bypass valve, store the mechanical separator in the starting chamber, turn on the compressor, supply compressed air from it to the bypass pipe;

- perform the displacement of oil from the connected pipeline that does not meet the standardized quality indicators, in the tank for substandard oil, pre-installed at the facility, preparing the oil for transport, for its subsequent pre-treatment or disposal;

- clean the internal cavity of the connected pipeline;

- close the final and initial bypass valves, open the connected and inlet valves, fill the connected pipeline with oil, ensuring its subsequent supply to the main pipeline.

The invention is illustrated in FIG. 1-3.

In FIG. 1 shows a schematic diagram of the stage of oil intake into the main pipeline, corresponding to standardized quality indicators (item I).

In FIG. 2 is a schematic diagram of an intermediate stage of preventing oil from entering the main pipeline that does not meet standardized quality indicators (item II).

In FIG. 3 shows a schematic diagram of the working stage of preventing the intake of oil into the main pipeline that does not meet standardized quality indicators (item III).

In FIG. 1-3 the following notation is applied:

1 - main pipeline;

2 - connected pipeline;

3 - supply pipe;

4 - bypass pipeline;

5 - unit for measuring oil quality;

6 - launch chamber;

7 - compressor;

8 - plug-in valve;

9 - inlet valve;

10 - initial bypass valve;

11 - final bypass valve;

12 - mechanical separator.

The way to prevent oil from entering the main pipeline that does not meet the standardized quality indicators is implemented as follows.

In the section of the connected pipeline 2, before the point of its connection with the oil quality measuring unit 5, a plug-in valve 8, equipped with an electric drive, is installed, and in the section of the supply pipe 3, between the oil quality measuring unit 5 and the main pipeline 1, a supply valve 9 is also equipped with an electric drive.

Bypass pipe 4 is connected to the section of the connected pipeline 2, in front of the installation site of the connected valve 8 (in the main direction of pumping), and to the section of the supply pipe 3, in front of the installation site of the inlet valve 9 (in the main direction of pumping) 4.

At the bypass pipe section 4, before the point of its connection to the supply pipe section 3, the initial bypass valve 10 is installed, and at the bypass pipe section 4, before the point of its connection to the connected pipe section 2, the final bypass valve 11 is installed. Behind the initial bypass valve 10 set the launch chamber 6, attach to its end part of the compressor 7.

In the normal mode of oil supply to the main pipeline 1, the plug-in valve 8 and the supply valve 9 are opened and the initial 10 and final 11 bypass valves are closed.

In the mode of preventing oil from entering the main pipeline 1 that does not correspond to the standardized quality indicators, the corresponding automatic signal from the oil quality measuring unit 5 in the automatic mode is alternately sent to the pumping unit (not shown) of the connected pipeline 2, to the connected 8, supply 9, initial 10 and end 11 bypass valves, turn off the pump installation (not shown) of the connected pipeline 2, close the supply 9 and the connected 8 valves, open the initial 10 and the end 11, the bypass valve. As a result of this, the supply pipe 3 is turned off, and substandard oil under the residual pressure in the connected pipe 2 is fed into the bypass pipe 4.

The initial bypass valve 10 is closed, the mechanical separator 12 is stored in the starting chamber 6, the compressor 7 is turned on and compressed air is supplied to the bypass pipe 4, under the influence of which the separator 12 is moved and expelled from the bypass pipe 4 and the connected oil pipe 2, which does not correspond to the standardized quality indicators , in a tank (not shown) for substandard oil, pre-installed at the facility that prepares oil for transport (not shown), for its subsequent pre-treatment or disposal lizings.

After cleaning the internal cavity of the connected pipeline 2, close the final 11 and initial 10 bypass valves, open the connected 8 and the inlet 9 valves, fill the connected pipeline 2 with oil, transfer it to the normal mode of oil supply to the main pipeline 1

Thus, as a result of the implementation of the proposed technical solution, it is possible to prevent oil from entering the main pipeline that does not meet standardized quality indicators and to increase the efficiency of processes to ensure the required level of oil quality when it is received into the main pipeline.

Claims (10)

A way to prevent oil from entering the main pipeline that does not meet standardized quality indicators, namely: - a section of the connected pipeline connected to the oil quality measuring unit, and a section of the supply pipeline between the oil quality measuring unit and the main pipeline are connected by a bypass pipe equipped with a start chamber with a compressor connected to it; - the connecting and supply pipelines are provided with the connecting and supply valves, respectively, and at the beginning and end of the bypass pipeline, the start and end bypass valves are installed, respectively; - to ensure unimpeded flow of oil into the main pipeline that meets the standardized quality indicators, the initial and final bypass valves are brought into the closed position, and the connected and supply valves into the open position; - when the oil quality measuring unit automatically detects the fact that oil passes through it that does not meet the standardized quality indicators, the corresponding signal in the automatic mode is alternately sent to the pump installation of the connected pipeline, to the connected, supply, initial and final bypass valves; - alternately in automatic mode, perform the following actions: turn off the pump installation of the connected pipeline, close the supply and connect valves, open the initial and final bypass valves; - close the initial bypass valve, store the mechanical separator in the starting chamber, turn on the compressor, supply compressed air from it to the bypass pipe; - perform the displacement of oil from the connected pipeline that does not meet the standardized quality indicators, in the tank for substandard oil, pre-installed at the facility, preparing the oil for transport, for its subsequent pre-treatment or disposal; - clean the internal cavity of the connected pipeline; - close the final and initial bypass valves, open the connected and inlet valves, fill the connected pipeline with oil, ensuring its subsequent supply to the main pipeline.

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