SU1260387A1 - Method of removing underlying water from petroleum or petroleum products - Google Patents

Description

The invention relates to the drainage of fluid from reservoirs and can be used in the refining, petroleum and other sectors of the industry.

There is a known method for draining commercial water and an automated device for removing it, consisting in that the separated commercial water is removed through the drain pipes connected to the storage tank equipped with the interphase level controller 1.

However, the limestone method and apparatus are difficult to operate and costly.

; The closest to the proposed technical essence and the achieved effect is the method of removing the produced water from the oil or oil products by settling in the tank and draining with the help of a receiving and discharge device 1.2

The disadvantage of the known method is the seizure of the oil product or oil with commercial water when it is drained into collection lines.

The purpose of the invention is to eliminate losses of oil and oil products and increase the efficiency of the process.

This goal is achieved by the fact that the method of removing the produced water from petroleum or petroleum products by e; e settling in tanks and drainage using a receiving and draining device is carried out before withdrawing oil or petroleum products by passing it with an emulsion and a boundary layer from one tank to another with the subsequent supply of crude oil or petroleum products to the bottom and settling it up to the accumulation of the bottom water layer in it with height and drainage is carried out to the remainder of the bottom water layer, B + d, where d is the diameter of the receiving and discharge knogo device, h the height from the tank bottom to a drain-receiving device.

The drawing shows an installation for carrying out the proposed method.

The method is carried out in the following manner.

In the group of tanks (in this case 1,2,3), one must at least be prepared to receive a new portion of oil, for example, tank 2, the others .1 and 3 are filled

-

foam oil. Before issuing marketable products from the lower part of tank 1, the accumulated produced water is by-passed along with emulsion and a small layer of oil equal to 3d (where d is the diameter of the receiving-drain device), which is hereinafter referred to as the boundary layer, to the reservoir 2, prepared to receive a new pore - oil building.

The height of the overflow lower layer is determined by known methods, for example, a water-oil phase separation sensor. In tank 2, simultaneously with or after the bypass, it is filled with a new portion of oil. From tank 1 after the bypass, commercial products are released, in tank 2 after it is filled up, sludge from a new portion of crude oil is produced, which is added to the already bypass portion. From tank 2 in front

 In the final product, the already described by-pass of commercial water, emulsion and boundary layer of oil into the reservoir prepared for receiving a new batch is carried out, such can be the empty tank 1. If necessary, commercial products from several tanks, for example 2 and 3, are produced

i water, emulsion and boundary layer

Oil is alternately transferred to the empty tank, then it is filled with a new portion of oil.

This perez sk commercial water,

the emulsion and the boundary layer of oil are carried out before the accumulation of a layer of produced water in tank b, where K is the height from the bottom, the tank to the receiving and discharge device, d is the diameter of the receiving and discharge device. and H. d, after which the accumulated layer is poured into waste lines to the remainder n- | -c | . The residue is transferred to the reservoir intended to receive a new batch of oil, and the accumulation cycle of produced water is repeated according to the indicated scheme.

Drainage of commercial water from the reservoir to the discharge lines should be carried out with the accumulation of commercial water with an emulsion of more C + 3d to a residue of more B + d. If the produced water has a layer thickness equal to or less than h - below the drain hole, In this case, the removal of the submerged water may not be a direct drain; Since the latter does not reach the drain; the Hole is not, but by capturing (ejecting) the upper layers, t. e. of oil. This method is extremely ineffective, as the commercial water is captured due to the rate of outflow of the upper oil layers. Basically there is an expiration of the oil product, not water.

If the produced water has a layer thickness (h + d), then in this case the removal of produced water is possible by direct outflow through the drainage hole, but with a lowering of the level, direct outflow of the underlying oil product occurs and an inevitable depression of the level in the zone occurs. that is, a hydraulic funnel is formed, through which the upper

layers. This is due to the loss of oil, the process of removing the commercial

product,

Therefore, to limit the possibility of involuntary discharge of the upper layers of oil through the drain hole, it is necessary to put a limit on the effectiveness of the proposed method to the lower level.

. h + d.

Form of hydraulic funnel

The openings of the free flow of various liquids depend on their density, viscosity, flow rate and fluctuate mainly for oils and oil products (in height) from zero to 2d, therefore it is advisable to start draining when the height of commercial water exceeds the lower limit (K + d) Ha.2d, i.e. h + 3d.

The proposed method makes it possible to completely eliminate losses of petroleum or petroleum products, which reach up to 10% or more. It is simple and reliable in operation and provides an increase in effective water supply from petroleum or petroleum products.

Claims (1)

METHOD FOR REMOVING COMMODITY WATER FROM OIL OR OIL PRODUCTS by settling it in tanks and draining using a suction device, characterized in that, in order to eliminate losses of oil and oil products and increase the efficiency of the process, drainage of produced water is carried out before the removal of oil or oil products by transferring it with an emulsion and a boundary layer from one reservoir to another with the subsequent supply of oil or oil products into it and settling it until a layer of produced water is accumulated in height ^ B. + 3c /, and drainage is carried out. pour from an additional tank, to the remainder of the bottom water layer} H + d, where d is the diameter of the receiving and launching device, 6 - height from the bottom of the tank to the intake and drain device. SU „„ 1260387