RU2246338C2 - Petroleum tank sump - Google Patents

Abstract

FIELD: petroleum industry; production and preparation of petroleum.

SUBSTANCE: the invention is dealt with the field of petroleum drying and may be used in petroleum industry at production and preparation of petroleum. The horizontal cylindrical body of a petroleum tank sump inside has vertical partitions of equal height, which form slots in the upper and lower parts of the body of the tank sump. Each partition, except for the last one, in turn is divided in height foe equal three and two parts with formation of horizontal slots. The technical result consists in the fact, that the tank sump may be operational in the state of being fully filled with a liquid, that simplifies a production mode, maintenance, makes it possible to use the tank sump at the initial for preliminary removal of water. of operation of an oil gathering system for preliminary removal of water.

EFFECT: the invention ensures operation of the tank sump being fully filled with a liquid, simplification of production mode, maintenance and its use at the initial stages of oil gathering for preliminary removal of water.

1 dwg

Description

The invention relates to the oil industry and can be used in the extraction and preparation of oil.

Oil sump at oil production facilities is the main and expensive equipment. Improving and efficient use of this equipment is an urgent task.

Known tubular sump separator (RF patent No. 2089259, class 01 D 17/00, publ. 09/10/97), consisting of horizontal and vertical pipes forming a common cavity of horizontal and vertical sections for the separation of gas, oil and water. The separation of gas, oil and water occurs when a mixture of liquid and gas moves in a thin layer in the upper horizontal pipe. The disadvantage of the sump is the need to provide a thin-layer regime of fluid flow in the upper horizontal pipe of the sump.

Closest to the proposed technical solution, a sedimentation apparatus for oil dehydration (RF patent No. 2077918, class B 01 D 17/028, publ. 04/27/97), consisting of a horizontal cylindrical body, nozzles for supplying a gas-liquid mixture, gas, oil and water level gauge height of the oil-water interface, with transverse partitions inside the housing, which are located in steps relative to each other, so that fluid overflows through the upper edge of the partitions. In this case, an intensive separation of gas, oil and water occurs. The disadvantage is the strict requirement to comply with the technological regime, the levels of the oil-water interface, oil in the oil compartment.

The objective of the proposed technical solution is to increase the reliability and efficiency of the sump for oil.

The problem is solved in such a way that in the known oil sump, including a casing, pipes for supplying an oil-water mixture, oil and water drainage, an oil-water separation level gauge, transverse partitions, according to the invention, the transverse partitions inside the sump are installed at the same height, forming slots at the upper and the lower generatrix of the body, each partition is alternately height divided into equal three and two parts, forming horizontal slots between the stripes of the partitions.

Placing the partitions inside the sump with slots of equal size above and below allows the sump to work in a state completely filled with liquid. This simplifies the placement of the sump without presenting requirements for height relative to other devices. There is no need to control the oil level. In this case, of course, the conditions for gas evolution worsen, but in practice gas separators are usually installed for gas evolution. The released gas in the sump is removed together with the oil and enters the next unit. Such a sump is effective for preliminary discharge of water in the initial sections of the oil collection system.

The formation of horizontal slots along the height of the partitions allows you to speed up the process of separation of oil and water, accelerates the process of sludge in the areas between the partitions.

The scheme of the sump for oil is shown in the drawing.

The sump includes a housing 1, a pipe 2 for supplying an oil-water mixture, a pipe 3 for draining oil, a pipe 4 for draining water, a level gauge 5 of the oil-water interface, partitions 6, a cap 7 for oil, a cap 8 for water, a hatch 9.

The sump is mounted and operates as follows.

An oil and gas pipe of large diameter (1.0-1.4 m) can be used as a sump body. For ease of installation, the body is assembled from separate sections of pipes, where two partitions are already mounted. Through the open ends of the short section of the pipe, the partitions are easily mounted as provided by design. When determining the width of the slits in the partition, it is necessary to take into account that the total area of the slots in each partition must be at least ten cross-sectional areas of the pipe 2 for supplying the oil-water mixture. After the assembly of the housing part with partitions 6, elliptical bottoms and the necessary nozzles are welded to the ends. For a clearer separation of oil and water, oil and water are discharged from caps 7 and 8.

It is advisable to mount such a sump in the initial section of the oil collection system and use it for separation and preliminary discharge of water.

After installing the housing 1 of the sump in the oil collection system through pipe 2, an oil-water mixture (emulsion) is supplied. As the housing 1 of the sump is filled with liquid, the sump begins to work in the mode of dynamic sludge, i.e. in continuous operation with fluid flow. Moreover, inside the housing 1 of the sump, the fluid flows through the slots between the partitions 6 and the housing 1 of the sump and through the horizontal slots in the partitions 6, except for the last partition, where such gaps are absent. With the passage of liquid through the gap, a thin-layer jet is formed, where there is a rapid separation of oil and water, the accumulation of oil in the upper part, and water in the lower part of the sump, which later move to pipes 3 and 4 to drain oil and water. The placement of cracks on the partitions at different heights allows you to intensify the process of separation of oil and water in the volume of the sump between the partitions. The last partition has a gap only at the top and bottom near the wall of the housing 1 of the sump, which contributes to a clearer separation of oil and water before draining them through pipes 3 and 4. The presence of caps 7 and 8 allows for the small diameter of the housing 1 of the sump to separate the drain points of oil and water to reduce disturbing factors at the oil-water interface. The level gauge 5 provides control over the level of the oil-water interface and regulate the flow rate of oil and water extraction to ensure the necessary technological regime.

Water from the sump through pipe 4 is discharged into the water treatment system and further disposal.

Oil is discharged through pipe 3 and is supplied to a prefabricated oil pipeline. The existing gas in the liquid supplied through the pipe 2 to the sump does not accumulate in the sump, but is removed together with the oil through the pipe 3.

Possible bottom sediments in the sump, if necessary, are removed through the cleaning hatch 9.

The proposed sedimentation tank operates in a fully filled pressure mode in the oil and water collection system, the technological mode is easily adjustable, easy to operate and reliable in operation.

The implementation of the partitions inside the sump at the same height, forming slots for the flow of liquid, provides a mode of separation of oil and water by settling in the state of the sump fully filled with liquid, intensifies the sludge process between the partitions, simplifies the adjustment of the technological mode, eliminates the need to place the sump at a certain height to provide overflow fluid from the sump to another process unit.

Thus, the proposed sump for oil with partitions inside the housing allows you to achieve the desired result in each case by increasing the number of partitions and the speed of the fluid flow inside the sump. The invention improves the reliability and efficiency of the sump for oil.

Claims (1)

Oil sump, including a housing, nozzles for supplying an oil-water mixture, oil and water drainage, an oil-water separation level gauge, transverse partitions, characterized in that the transverse partitions inside the sump are installed at the same height, forming gaps at the upper and lower generators of the body, each the partition is alternately heightwise divided into equal three and two parts, forming horizontal slots between the stripes of the partitions.