RU62909U1 - RESERVOIR TANK FOR STORAGE AND SEPARATION OF RAW OIL FROM WATER - Google Patents

Abstract

The proposed utility model relates to liquid storage media and can be used in the oil industry to receive, store and dispense oil and viscous oil products. The solution to this problem is achieved by the fact that on the steel vertical cylindrical tank for dark oil products, two dispensing nozzles with shut-off valves are additionally installed for the delivery of crude oil above the water level and two siphon taps for determining the water level, as well as a drainage nozzle with a valve and piping communications for the purpose of pumping (discharge) of produced water. Sectional heaters are also installed inside the tank, designed to increase the rate of separation of water from crude oil. The tank works as follows. Through the inlet pipe and the corresponding valve, the crude oil enters the tank and is heated using internal heaters. After filling, the approximate water level in the tank is determined using siphon taps. Then opens the drain valve for pumping water. After that, the valve of the additional dispensing pipe opens, located above the water level, for pumping crude oil through the pipeline. In the process of oil delivery, the water level in the tank is periodically determined and the process of pumping crude oil is regulated with the help of additional and main dispensing pipes and valves. It should be noted that the proposed utility model allows simultaneous pumping of crude oil, water separation, as well as water drainage into a separate tank or well.

Description

The proposed utility model relates to means for storing oil and oil products, and can be used in the oil industry to receive, store and dispense crude oil, as well as to separate it from water.

The proposed utility model is most applicable when using crude oil. By crude oil is meant a liquid natural fossil mixture of hydrocarbons of a wide physicochemical composition, which contains water, dissolved gas, mineral salts and mechanical impurities [1].

Known vertical cylindrical steel tank for light petroleum products (RVS) [2]. This tank has a bottom, a wall and a fixed roof. For receiving and dispensing petroleum products, reservoirs of this type have acceptance pipes. From the outside, valves are connected to them. In order to provide “small and large” tank breaths, there is a breathing valve. A metering hatch is installed on the roof of the tank, which serves to measure the level and take fuel samples.

In order to protect the tank from flash or explosion in the presence of fire near (PBC), a fire fuse is installed under the breathing valve. To drain commercial water, a siphon valve is installed in the lower zone of the tank. The siphon valve consists of a pipe with a bent end located inside the tank and a ball valve with a handle mounted on a pipe that is not included in the tank. Also on the tank are monitoring and signaling devices (level gauges, samplers, level indicators, fire fighting devices) and other equipment (manhole, ventilation pipes, safety valves).

The disadvantages of this tank when receiving and issuing crude oil with a high water content are:

1. Low efficiency in the sedimentation of water from crude oil. The tank does not have special equipment to accelerate the separation of water (internal heater).

2. Low efficiency when pumping water from the tank. To remove water, there is only one siphon valve with a diameter of Du-50 (Du-80).

3. The inability to pump oil from the tank with a large amount of water. The tank has one dispensing nozzle installed in the lower part. If the water level exceeds the upper level of the diameter of the hole for the pipe, oil pumping is impossible.

The closest in technical essence of the proposed utility model is a tank for dark oil products [2]. This tank has the same equipment as the tank for light petroleum products. Additionally, a lifting pipe with a hinge and a roller block is installed inside it. This pipe is installed to take oil from the upper layers of the tank or from a given height. The lifting pipe is connected to special joints based on the bottom or wall of the tank. To pass the cable of the lifting pipe through the roof of the tank, a roller block is installed on it. To raise and lower the lifting pipe, a manual winch is installed on the tank body.

Also, for the purpose of storing and dispensing viscous petroleum products, tanks for dark petroleum products are equipped with internal sectional heaters. The standards of technological design for heating oil provides for the use of saturated water vapor and hot water. Heaters are located at the bottom of the tank. The use of internal heaters allows you to speed up the process of separating water from oil.

The disadvantages of this tank when receiving and issuing crude oil with a high water content are:

1. Lack of a separate distributing branch pipe for removal of water from the tank. In this regard, there is no possibility

simultaneously pump oil through a riser and drain the water.

2. Low efficiency of determining the level of the oil-water phase separation, as well as low productivity when pumping water from the tank.

3. A high probability of failure of the hinge device and the roller unit for regulating the level of the riser pipe.

The proposed utility model makes it possible to solve the problem of increasing the efficiency of the delivery of crude oil with a high water content from RVS in order to further prepare it for the production of commercial oil. It also increases the rate of separation of water from oil.

The solution to this problem is achieved by the fact that dispensing pipes, siphon taps and a drainage pipe are additionally installed on the tank for dark oil products equipped with heaters. In particular, instead of one dispensing nozzle and one siphon valve, three dispensing nozzles and three siphon valves are installed vertically at distances corresponding to the rules for constructing vertical, cylindrical, steel tanks for oil and oil products. The recommended values of the conditional passages of the nozzles are 100, 150, 200 and 250 mm [3]. The nozzles are equipped with valves of the corresponding diameter and piping communications.

At the same time, a drain pipe is welded to the bottom of the tank wall, which is equipped with a valve and a pipeline. Through the pipeline, water is pumped or by gravity to a separate tank, from where it is then pumped into a special well or tank.

Additional siphon taps are designed to determine the water level in the tank. The water level between siphon taps can be determined using a universal device for determining the levels of various liquids in tanks [4]. The application of the second and third

additional dispensing pipes located above the main dispensing pipe allows you to solve the problem of more efficient delivery of crude oil from the proposed tank for further preparation. Installation of additional dispensing and drainage pipes, as well as siphon taps, allows continuous pumping of crude oil above the water level. In this case, simultaneously with the pumping, accelerated separation of water from crude oil will occur due to the use of internal heaters, as well as drainage of water from the tank using a drain pipe, gate valve and pipeline communications.

These signs are essential for solving the problem of the utility model, since the efficiency of the delivery of crude oil is increased, the rate of separation of water, as well as the drainage of water from the reservoir, increase.

The essence of the utility model is illustrated by drawings (figure 1, figure 2), which depict: the tank in section and a top view of the proposed utility model.

The proposed tank 1, having a receiving 2 and a distributing 3 pipes, valves 4, siphon valve 5, light and metering hatches 6.7 ventilation pipe 8, manhole 9, breathing valve 10, two additional transfer pipes 3 with valves and piping are installed vertically communications 11. Also, two additional siphon taps 5 are installed vertically at the same height as the dispensing nozzles on the tank 5. Inside the PBC, internal sectional heaters 12 with pipes for supplying steam or hot water are installed 13. K n bo ttom of the wall of the tank drain pipe 14 is welded to the bolt 15 and the pipe for pumping out water 16. Because of the great complexity and high probability of failure of the reservoir is removed the lifting tube with the hinge and roller block.

The utility model works as follows. Through the intake pipe 2 and the corresponding valve 4, the crude oil enters the tank.

Using internal heaters 12, hot steam is supplied to the PBC. After filling, the operator using siphon taps 5 determines the approximate level of water in the tank. After that, the drain valve 15 opens for pumping water through the pipeline 16. Having determined the water level in the tank, the operator opens the necessary valve 4 of an additional dispensing pipe 3 for pumping crude oil through the pipe 11.

In the process of oil delivery, the operator periodically determines the water level in the tank and regulates the oil pumping process using additional and main dispensing pipes 3 and corresponding valves 4. In necessary cases, a universal device for determining the level of various liquids in the tanks is used to determine the water level.

It should be noted that the proposed utility model allows simultaneous pumping of crude oil, water separation, as well as drainage of water into a separate tank or well.

Literature

1. GOST R 51858 Oil. General specifications. M .: GOSSTANDART, 2002.

2. L. A. Matskin et al. Operation of oil depots. M .: NEDRA, 1975 - 392 p.

3. Rules for the construction of vertical cylindrical steel tanks for oil and oil products. M. (Resolution of the Gosgortekhnadzor of Russia No. 76) 2003.

4. Patent for utility model No. 46352. Device for determining the level of produced water in the tank.

Claims (1)

A tank for storing, dispensing and separating crude oil from water, containing equipment installed on a vertical steel tank for dark oil products, characterized in that two dispensing pipes with shut-off valves for dispensing crude oil above the water level are additionally vertically installed outside the tank, two siphon taps for determining the water level, a drainage pipe with a valve and pipeline communications for the purpose of pumping (draining) produced water, as well as inside the tank, are installed optional heaters designed to increase the rate of separation of water from crude oil.