RU2163701C1 - Device for dosing of reagent supplied to pipeline - Google Patents

Abstract

FIELD: petroleum industry. SUBSTANCE: device may be used in petroleum production and transportation over pipelines. Dosed supply of reagent to pipeline is effected due to creation of pressure differential with use of high-speed flow of petroleum in pipeline and with reliable separation of petroleum and reagent in container by means of flexible membrane which may be fitted tightly to container walls. Open end of tube for liquid delivery from pipeline to container is bent and positioned along pipeline axis opposite to liquid flow. EFFECT: extended range of application, enhanced reliability. 1 dwg

Description

 The invention relates to the oil industry and can be used in the extraction and transportation of oil through pipelines.

 To increase the efficiency of oil production and transportation, various reagents are used and introduced at different parts of the oil collection system and pipeline transportation.

 A device for dispensing a reagent into an oil pipeline is known (RF patent N 2133913, class E 21 B 43/00, op. 07.27.99) containing a container for a reagent, nozzles for dosing and filling the reagent, the container being connected to a gas collector on the oil pipeline. However, the device only works effectively when the transported oil contains free gas. And in heavy and more prepared oils, free gas may be absent, and in such cases, oil enters the container for the reagent and the dosage of the reagent is violated.

 The closest in technical essence to the proposed invention is a device for dispensing a reagent in a pipeline (a.s. N 1789827, class F 17 D 3/00, op. 23.01.93), including a container for a reagent, equipped with tubes for input and output reagent, as well as a tube for supplying liquid from the pipeline to the upper cavity of the container, while the piston with a seal is placed in the container, acting as a separator of the oil medium and the reagent.

 The disadvantage of this device is the presence of a piston with a seal, since a piston with a seal in the container requires a significant pressure drop, and due to its own weight, the piston cannot move. And for the displacement of the reagent from the container, additional effort is required. All this determines the accurate dosage of the reagent in the oil medium and indicates the unreliable operation of the device.

 Thus, the problem arose of increasing the reliability of the device for dosing the reagent into the pipeline.

 The problem is solved by the proposed device for dispensing a reagent into a pipeline, including a reagent container with a separator placed in it, equipped with tubes for reagent input and output, as well as a pipe for supplying liquid from the pipeline to the upper cavity of the container and an adjustment valve, in which, according to the invention , the separator is made in the form of a flexible membrane, and the open end of the pipe for supplying liquid from the pipeline is bent and placed along the axis of the pipeline against the fluid flow.

 The presence of a flexible membrane that acts as a separator between the reagent and the oil in the container allows the dosage of the reagent without causing resistance when the separator moves beyond the level of the reagent in the container.

 The implementation of the tube for supplying liquid from the pipeline to the upper cavity of the container with a curved end placed along the axis of the pipeline against the fluid flow creates excessive pressure in the container due to the high-speed pressure of the fluid moving through the pipeline, which allows the dosage of the reagent under pressure, which is especially important when the density reagent and oil are close in magnitude.

 In addition, the specified technical solution allows the use of a device for dispensing a reagent even in the absence of free gas in the transported liquid.

 The drawing shows the proposed device.

 The device includes a pipe 1, a container 2 for a reagent, a flexible membrane 3, an adjusting valve 4, a pipe 5 for introducing a reagent into the pipeline, a pipe 6 for collecting oil, a pipe 7 for filling the container with a reagent, a pipe 8 for relieving pressure, a connecting pipe 9, and shut-off valves cranes 10, 11, 12, 13.

 The device is mounted and operates as follows.

 On a selected section of the pipeline through which oil is transported, pipes 5 and 6 are cut off, a container 2 with a flexible membrane 3 and with the corresponding nozzles is installed. The container is connected to the pipeline 1 through tubes 5, 6 and 9 with the necessary valves 10, 11, 12. With the container 2 empty, the flexible membrane 3 is in the lower position, adjacent to the wall of the lower half of the container. After completion of installation work and readiness for commissioning, the container is filled with reagent. In this case, the control valve 4 and the valve 10 must be closed, and the taps 11, 12, 13 open. The reagent is fed into the container through the tube 7. At the same time, the flexible membrane begins to rise, and pressure is released from the space above the flexible membrane through the pipe 8. The container filled with the estimated amount of reagent. The end of the reagent flow is controlled by the selection of the reagent through the tube 7.

 The device is put into operation by opening the control valve 4 and the valve 10. In this case, the valves 11 and 13 should be closed. Then the part of the container below the flexible membrane filled with reagent is connected by a pipe 1 through the control valve 4, which is adjusted to the dosage of the reagent at a given flow rate. The part of the container above the flexible membrane through tubes 6 and 9 begins to fill with oil pumped through pipeline 1. As the reagent is consumed, the flexible membrane follows the level of the reagent and, when the reagent is fully consumed, the flexible membrane adheres to the wall of the lower part of the container.

 The use of a flexible membrane as a separator between the reagent and the oil in the container allows minimizing the resistance of the separator when the level of the reagent changes, which increases the reliability of the device.

 The design of the pipe 6 for the intake of oil to compensate for the volume of reagent used in the form of a bent tube with an open end against the oil flow allows you to create excess pressure in the container due to the high-pressure head of oil moving through the pipe 1. The pipe 5 for introducing the reagent into the pipe 1 has the same bent the end, but the open end is directed downstream, which allows you to create a reagent suction from this tube. Thus, between the container and the point of entry of the reagent into the pipeline, a pressure differential is created sufficient to supply the reagent to the pipeline, which also increases the reliability and efficiency of the device for dispensing the reagent. The proposed device for dosing the reagent into the pipeline can work in any case, in the presence of free gas and in the absence of it in the oil pumped through the pipeline, that is, there are no limiting conditions for the use of the device with a sufficiently high reliability of the dosing of the reagent to any point in the pipeline.

Claims (2)

 1. A device for dispensing a reagent into a pipeline, including a reagent container with a separator placed in it, equipped with tubes for reagent input and output, as well as a pipe for supplying liquid from the pipeline to the upper cavity of the container, and an adjustment valve, characterized in that the separator is made in the form of a flexible membrane with the ability to fit to the wall of the container.  2. The device according to claim 1, characterized in that the open end of the tube for supplying fluid from the pipeline to the container is bent against the fluid flow, and the open end of the tube for introducing the reagent into the pipeline is bent along the fluid flow and placed along the axis of the pipeline.