RU219802U1 - Device for removing the intermediate layer from technological equipment for oil treatment - Google Patents

Abstract

The utility model relates to the field preparation of oil, namely to the dehydration of oil by gravity settling of a water-oil emulsion. The technical result of the utility model is to simplify the design of the device, which improves the efficiency of the process. As well as expanding the technological capabilities of the device and the arsenal of technical means for removing the intermediate layer from the process equipment for oil preparation. The device for removing the intermediate layer from the process equipment for oil treatment contains an emulsion supply pipeline, an oil and water treatment apparatus with outlet nozzles for water and oil, and a device for removing the intermediate layer. The emulsion supply pipeline is located on the end side of the apparatus, and inside the apparatus the water-oil emulsion supply pipeline is connected to a U-shaped manifold with holes made along the upper generatrix, ensuring the distribution of the emulsion supply below the intermediate layer, on the outside of the apparatus, the emulsion supply pipeline is equipped with a secant valve, and between the secant valve and the apparatus on the emulsion supply pipeline, an outlet pipeline with a valve is additionally placed. 1 ill.

Description

The utility model relates to the field treatment of oil, namely to the dehydration of oil by gravity settling of a water-oil emulsion.

For the preparation of oil, technological equipment is used - tanks and horizontal settling tanks, in which a layer of oil, water and an intermediate layer are formed during the sedimentation process.

A device is known for removing the intermediate layer from the process equipment for oil treatment, containing an emulsion supply pipeline, a device for preliminary discharge of formation water with a water outlet fitting, an oil output fitting and an intermediate layer output fitting (AS SU No. 1398885, publ. 30.05.1988 ). The oil outlet fitting is connected by a raw pipeline to a raw pump. An ejector is installed in the apparatus at the level of the intermediate layer. The production of the well through the emulsion supply pipeline enters the apparatus. In the apparatus, under the action of gravitational forces, the emulsion is separated into water and partially dehydrated oil, which are located, respectively, in the lower and upper zones of the apparatus. At the level of phase separation there is an intermediate layer consisting of oil, water, mechanical impurities, salt microcrystals, stable water-oil emulsions stabilized by iron sulfide and other emulsifiers, paraffin and other components.

The disadvantage of the device is the complexity of the design, as well as the low efficiency of oil treatment, since the intermediate layer is removed from the apparatus and sent together with the partially dehydrated oil by the feed pump.

The closest in technical essence is a device for removing the intermediate layer from the technological equipment for oil treatment, containing an emulsion supply pipeline, an oil and water treatment apparatus with outlet pipes for water and oil, and a device for removing the intermediate layer (ac. SU No. 1636009 , published 23.03.1991). The device for removing the intermediate layer contains corrugated elastic chambers, a flexible traction body, shutters, bypass rollers, a reverse drive for the output devices and retaining valves, which complicates the design and increases the installation time of this design. The use of retaining valves is also a unit that, during periodic operation, tends to become clogged with mechanical impurities present in the composition of the intermediate layers and subsequent violation of the tightness of the valves. Taking into account the operation of containers at overpressures of several atmospheres, the valve data must be calibrated to a pressure that excludes operation at operating pressures. Accordingly, to provide pressure by compressing the corrugated chamber, a large force is required, which requires the installation of an additional electric drive in the reversing device. The input into the container is carried out in the lower generatrix of the container, i.e. located in close proximity to the water outlet. This, in turn, does not allow efficient use of the entire space of the oil emulsion settling tank and oil products are carried away with water - the quality of the discharged water is poor.

The disadvantage of the device is the complexity of the design, the rapid failure of the corrugated elastic chambers.

The technical result of the utility model is to simplify the design of the device, which improves the efficiency of the process. As well as expanding the technological capabilities of the device and the arsenal of technical means for removing the intermediate layer from the process equipment for oil preparation.

The technical result is achieved by a device for removing the intermediate layer from the process equipment for oil treatment, containing an emulsion supply pipeline, an oil and water treatment apparatus with outlet nozzles for water and oil, and a device for removing the intermediate layer.

What is new is that the emulsion supply pipeline is located on the end side of the apparatus, and inside the apparatus the water-oil emulsion supply pipeline is connected to a U-shaped manifold with holes made along the upper generatrix, ensuring the distribution of the emulsion supply below the intermediate layer, from the outside of the apparatus, the emulsion supply pipeline equipped with a secant valve, and between the secant valve and the apparatus on the emulsion supply pipeline, an outlet pipeline with a valve is additionally placed.

In FIG. 1 shows a device for withdrawing an intermediate layer from oil treatment equipment.

The device for removing the intermediate layer from the process equipment for oil preparation contains an emulsion supply pipeline 1, an oil and water preparation apparatus 2 with outlet pipes for oil 3 and water 4, and a device for removing the intermediate layer 5. The emulsion supply pipeline 1 is located on the end side of the apparatus 2, and inside the apparatus it is connected to a U-shaped collector 6 with holes 7 made along the upper generatrix, ensuring a uniform distribution of the emulsion supply inside the container. On the outside of the apparatus 2, the emulsion supply pipeline 1 is equipped with a secant valve 8. Between the secant valve 8 and the apparatus 2, an outlet pipeline 9 with a valve 10 is additionally placed on the emulsion supply pipeline 1.

The device works as follows.

Apparatus 2 for the preparation of oil and water is a horizontally made cylindrical container, for example, a volume of 200 m3. In the upper part there is an outlet pipe of settled oil 3 with a valve 11, in the lower part there is an outlet pipe of settled water 4 with a valve 12. In the left side bottom on the end side there is a pipeline for supplying water-oil emulsion 1, which provides input of well production. Inside the apparatus, the oil-water emulsion supply pipeline 1 is connected to a horizontal U-shaped collector 6 closed at both ends with holes 7 made along the upper generatrix, ensuring uniform distribution of the emulsion supply inside the tank. The water-intermediate layer phase boundary is maintained above or at the level of the upper generatrix of the collector 6. The collector 6 is made of a pipeline (material St-20) with a length of at least half the length of the apparatus 2, and a diameter (selected by calculation) that ensures the absence of resistance to the flow of the incoming liquid into the apparatus. Holes 7 of round shape with a diameter of 40-50 mm on the upper generatrix of the collector are made with a step of 250 mm along the entire length of the collector 6.

On the outside of the apparatus 2, the emulsion supply pipeline 1 is equipped with a secant valve 8. Between the secant valve 8 and apparatus 2, an outlet pipeline 9 with a secant valve 10 is additionally placed on the emulsion supply pipeline 1. The material of the outlet pipe is St-20, the diameter, for example, is 100 mm .

Water-oil emulsion, water cut 5-95% and temperature 4-80°C, through the supply pipeline 1 enters the collector 6 and exits through holes 7 and is evenly distributed under the intermediate layer. When this valve 10 on the outlet pipeline 9 is closed. Oil under the action of gravitational forces rises to the upper part of the horizontal settling tank 2 and with a water cut of not more than 5% is removed from it through the branch pipe 3, and the separated water accumulates in the lower part of the horizontal tank 2 and with an oil content of not more than 300 mg/l is continuously discharged through the branch pipe 4. The level of separated water is controlled by means of automation and maintained at the level of the upper generatrix of the U-shaped collector 6.

At the oil-water interface level, an intermediate layer accumulates (stable water-oil emulsion, stabilized by iron sulfide and other emulsifiers), which reduces the efficiency of apparatus 2. To normalize the oil treatment process, the intermediate layers accumulated during operation must be removed from the apparatus. To output the intermediate layer to the drainage system 13, first close the secant valve 8 on the inlet pipeline 1, open the valve 10 on the outlet pipeline 9. The output of the intermediate layer is performed through the holes 7 in the collector 6 by "reverse flow" of the liquid. The displacement of the intermediate layer occurs due to the pressure difference in the tank (excess pressure) and in the drainage system (atmospheric pressure). The duration of the process of draining the intermediate layer is determined by the readings of the level gauge 14, showing the boundaries of the "oil-intermediate layer" and "intermediate layer-water" interfaces. The intermediate layer is drained until the minimum thickness of the intermediate layer is reached.

Upon completion of the withdrawal of the intermediate layer, close the valve 10 on the outlet pipeline 9 and open the secant valve 8 on the inlet pipeline 1 and restore the operation of the horizontal tank 2.

The proposed design of the device for removing the intermediate layer from the process equipment for oil treatment is simple to manufacture and reliable in operation.

The device for removing the intermediate layer from the technological equipment for oil treatment ensures high efficiency of the dehydration process in the apparatus due to the use of a collector for introducing the emulsion and withdrawing the intermediate layer through the outlet pipeline, eliminating the use of additional equipment, promptly removing stable water-oil emulsions complicated by paraffin, sulfide from the apparatus containing and other components.

Allows you to expand the technological capabilities of the device and the arsenal of technical means for removing the intermediate layer from the process equipment for oil treatment.

Claims (1)

A device for removing the intermediate layer from the process equipment for oil treatment, containing an emulsion supply pipeline, an oil and water treatment apparatus with outlet pipes for water and oil, and a device for removing the intermediate layer, characterized in that the emulsion supply pipeline is located on the end side of the apparatus, and inside the apparatus, the oil-water emulsion supply pipeline is connected to a U-shaped manifold with holes made along the upper generatrix, ensuring uniform distribution of the emulsion supply inside the tank, on the outside of the apparatus, the emulsion supply pipeline is equipped with a secant valve, and between the secant valve and the apparatus on the emulsion supply pipeline an outlet pipeline with a valve is additionally placed.