SU767177A1 - Method of oil dehydrating and desalinization - Google Patents

Description

GHG droplets of oil, drainage water separated from oil with oil content of 150–6600 mg / l and suspended, 60–800 mg / l oil particles from the tank are sent for cleaning to a sump with a hydrophobic liquid filter, in which As a contact (filtering) material, an oil layer with a thickness of about 1 m is used on the surface of the water, formed as a result of separation of oil inclusions with mechanical lines from the purified drainage water. Grouting drainage reservoir reser, the boar enters the settling tank from top to bottom through the oil filter layer in the form of separate streams and drops. At this time, the oil particles, which are located in water, contact with the oil medium and merge with it, as a result, the transition of solid suspended particles possessing a hydrophobic surface. in the oil industry. . Water after passing through the non-, ft layer enters the lower water zone, where the JDT stabilization process and its additional purification take place. Purified riaebcoM6nc water is injected into a reservoir pressure maintenance system. The quality of purified water, depending on the degree of its pollution, is characterized by the content of oil products (23350 mg / l) and suspended mechanical particles (20-500 mg / l),. The dehydrated and desalted oil from the settling tanks is sent to the tanks of the commodity parks.

The disadvantage of this method is to reduce the degree of purification of drainage water in connection with the constant contamination of the filter oil layer of mechanical impurities during the drying process; clay, lime, tar, paafina, etc., coming together in the apparatus to be cleaned with drainage water. This is due to the lack of a process for continuously updating the contaminated filtering oil layer and reducing its efficiency. In this method, only periodic (one paradise three months) pumping of the contaminated (waste) oil from the drainage water purification apparatus is carried out. It does not provide the necessary complete and regular updating and restoration of the efficiency of the filter layer. The quality of the drainage water that is directed to the purification according to the content of various impurities varies in a very wide range, moreover, the filtering of the filtering oil and the oil layer also occurs in varying degrees. As a result, the quality of the treated water is randand ( the oil content is 25-- 350 mg / l and mechanical suspended particles 20-500 mg / l), which makes it difficult

767177

its continuous injection into the reservoir without additional purification. In addition to the lack of a reliable method for monitoring the process of contamination of the filter layer, depending on the duration of work and the quality of the drainage water sent for purification, it is difficult to manage the process of cleaning the drainage water.

The purpose of the invention is: to increase the degree of purification of drainage water.

The goal is achieved by the fact that according to the method of oil dehydration and desalting, including the introduction of a demulsifier and drainage water into it, heating, coalescence, sludge, separation and purification of the drainage water by filtration through a layer of oil, the oil filtering layer is continuously updated by circulating through dehydrated or demineralized oil in the amount of 1-10% of the volume of purified drainage water.

Continuous updating of the filtering layer with pure oil (dehydrated or desalted) prevents its viscosity from increasing, by eliminating the accumulation of mechanical impurities in it, resin and paraffin inclusions, which provides more efficient filtration of water and the Transition of Oil from the purified water into the oil filtering layer.

The drawing shows a schematic flow diagram of the proposed method,

PRI me R 1, In an oil-collecting pipe-runner 1, which transports water oil to an emulsion containing about 50% of water, the demulsifier reagent is fed through line 2 at a rate of 10 g per ton of oil. The emulsion treated with a demulsifier in the amount of 600 MV4 is sent to tank 3, in which 5 pre-separation takes place and water is discharged for purification. In the pre-dewatered oil with a residual water content of 1.5.-15%, an additional demulsifier is introduced through the pipeline. 4 at the rate of 20 g per ton of oil and pump 5 through heat exchangers 6, which heat it up to 35-45 ° C, and droplet generator 7 is pumped to the sumps 8, where the final dehydration of oil to the residual water retention in the range of 0.1-0.3 % salt up to 70-250 mg / l; Fresh flushing water is introduced into dewatered oil through pipeline 9 at the rate of 1-3% per ton of oil and through a digestifier 10 it is sent to septic tanks 11 / in which it is further dehydrated and desalted. to a residual water content of 0.0-0.2% and salts up to 40 mg / l. Separated in the tank 3 and the settling tanks 8 and I, the water is sent to the apparatus 12, where it is filtered through: a hydrophobic liquid layer 13 about one meter thick, which is used as oil, drained through the settling tanks 8, in quantities of 1% () of the volume of water being purified. The total amount of water entering the purification is about 300, the average degree of pollution of which is within 150 mg / l of oil inclusions and 60 ml / l and other suspended particles (sand, clay, tar, paraffin and others.) At the same time, fil The oil layer is renewed by continuous circulation of said 1% dehydrated oil which is pumped out of the lower part (filter 1 by pump 15 in the oil collection pipe 1. Purified water containing 20–52 mg / l of oil inclusions and 18–56 mg / L other pumped particles are pumped out by pump 16 into the system of the water-flooding of oil reservoirs 2. In the oil-collecting example, pipeline 1I, through which a water-oil emulsion containing about 50% of water is transported, is fed through pipe 2 to a demulsifying agent at the rate of 10 g per ton . The emulsion treated with a demulsifier in the amount of 600 is sent to the tank 3, in which the preliminary separation and discharge of water to the purification takes place. In the previously dehydrated oil with a residual water content of 1.5-15%, an additional demulsifier is introduced through pipeline 4 at the rate of 20 g per ton of oil and pump 5 through heat exchangers 6, in which it is heated to 35-4СгС, and a drop diffuser 7 pumped to the sumps 8, where the final dehydration of oil to the residual water content of 0.0-0.3% and salts to 70-250 mg / l. Fresh crude is introduced into the dewatered oil (the eternal water through pipeline 9 at the rate of 1-3% per ton of oil and through the droplet grit 10 directs it to sedimentation tanks 11, in which it is further dehydrated to a residual water content of 0.0-0.2% i-salts up to 40 mg / l, separating the eoyuis in tank 3 and settling tank 8 and 11 water is sent to the apparatus 12, where it is filtered through a hydrophobic liquid layer 13, about 1 m thick, and desalted oil is used as KOTipporo through pipeline 17 in the amount of 10% (30 MV4) of the volume of water being purified. And the total amount of water entering the purification is about 300, the average degree of contamination of which is within 6,600 mg / l of oil 1 inclusions and 380 mg / l of other suspended particles (sand, clay, tar, paraffin and etc.) At the same time, the oil filter layer is renewed by continuous circulation of said 10% desalted oil, which is pumped from the bottom of the filter layer by pump 15 to the oil collection pipeline 1. Purified iodine containing 15-35 mg / l of oil inclusions and 16-48 mg / l of other suspended particles by pump 16 from Pumped into the reservoir system of oil reservoirs, -... ... In order to determine the optimal amount of the anhydrous (demineralized) oil directed to the circulation through the filtering layer, depending on the degree of water pollution, the pilot plant . The results of these works are shown in the table.

60 60 60

0.5 1.0 3.0

19-70 18-47 18-45

As can be seen from the table, a significant improvement in the quality of the purified water is achieved by circulating one percent of the dehydrated or desalted oil, and at higher contamination at 10%, send a round of oil to the 1st floor; , more than 10% is impractical / because no further significant improvement in the quality of water purification occurs.

The application of this method of dehydration and desalting of crude oil due to the continuous renewal of the fiyotruyuschey layer by circulating through it a part of the dehydrated or desalted oil allows an increase in the degree of purification of the draminesian water. reduce the content of oil products from 25-350 mg / l to 1535 mg / l and suspended mechanical particles from 20-500 mg / l to 15-40 mg / l and stabilize the process of water purification while at the same time obtaining high-quality oil.

Continuation of tpblitsa

Claims (1)

 Invention Formula The method of dewatering and desalting of oil, including the introduction of dezedator and drainage water into it, heating, cohesion, sludge, separation and purification of drainage water is filtered through a layer of oil that is different in that, in order to improve the degree of purification of drainage water, filtering The Henpei iBHo oil layer is renewed by circulating through it the dehydrated or desalted oil in the amount of 1-10% of the volume of the purified drainage water. Sources of information taken into account in the examination 1, Lutoshkin G, S, Collection and preparation of oil, gas and dody to transport, M., Nedra, 1972, s, 208, 2, Tronov V, P, Promyslova, oil preparation, k,, Li dre, 1977, c, 14 (prototype),.