Method for collecting and preparing drainage water

FIELD: oil industry, possible use for preparing oil emulsion at oil preparation plants.

SUBSTANCE: method includes feeding oil emulsion received from oil fields into devices for preliminary water disposal, separating water part from oil emulsion in preliminary water disposal devices and draining of water part to cleaning structures, cold separation of gas from oil emulsion in buffer vessels, heating of oil emulsion in heat exchangers and in furnace, hot dehydration of oil emulsion at hot sediment stages, desalination of oil emulsion in electric dehydrators with feeding of fresh water into electric dehydrators through disperser, feeding of drainage water after hot sediment and electric dehydrators to beginning of process at devices for preliminary water disposal, feeding of processed oil from electric dehydrators through heat exchangers into buffer vessels for processed oil, hot separation of gas in buffer vessels for processed oil and feeding of oil to consumer. In accordance to invention devices for preliminary oil disposal are divided on two steps. First step is operated in normal mode with feeding of oil emulsion from oil fields into inlet and from preliminary water disposal devices into buffer vessels. Second step is bound in parallel to first step, feeding of oil emulsion from oil fields into inlet of second step of preliminary water disposal devices is prevented. Drainage water after hot sediment and electric dehydrators is fed to inlet of second step of preliminary water disposal devices, without mixing thereof with water-oil emulsion received from fields. From second step of preliminary water disposal devices part of water is fed into cleaning structures and oil emulsion is fed into inlet of buffer vessels. Influx of drainage water into inlet of second step of preliminary water disposal devices is performed through lower manifold-distributor of device below layer of water cushion, while technological process in second step of preliminary water disposal devices is performed at temperature of 50-80°C.

EFFECT: increased efficiency of separation of water-oil emulsion at preliminary dehydration stage onto oil and water, stabilization of hot dehydration stages operation, desalination of oil and prevention of growth of number of intermediate layers from stable emulsions.

1 ex

 

The invention relates to the oil industry and can find application in the preparation of oil-water emulsion on the oil treatment plants.

There is a method of dehydrating and desalting of oil emulsion intermediate oil layer formed in the settling tanks and apparatus oil treatment plants, including the supply of oil emulsion in the tank with a flow rate of 0.5-1 m3/h through the layer of the waste water of the same oil reservoir with a salinity of less than the saturation temperature of 20-30°and a layer thickness of wastewater 6-8 m, Department of oil and direction at the inlet of the oil (RF Patent No. 2256791, CL E 21 In 43/34, publ. 2005.07.20).

The known method can effectively separate oil-water emulsion into oil and water and separate the solids. However, the resulting drainage water does not meet the requirements of water for reservoir pressure maintenance.

The closest to the proposed invention the technical essence is a way of gathering and preparation of drainage water, including supply oil emulsion coming from the oil fields in serial connected devices preliminary water discharge, separation of the water from the oil emulsion in the series connected devices preliminary water discharge and reset cha is Ty water treatment plants, cold separation of gas from oil emulsion in the buffer tanks, heating oil emulsion in heat exchangers and furnaces, hot air dehydration of petroleum emulsions on the steps of hot sludge, desalting oil emulsion in dehydrators with submission in the dehydrators through disperser fresh water supply drainage water after the hot sludge and dehydrators in the beginning of the process apparatus of the preliminary discharge, the flow of the dehydrators of finished oil through the heat exchangers in the buffer capacity of the finished oil, hot gas separation in the buffer containers of finished oil and pumping the oil to the consumer (Thrones VP "oil gathering and hydrodynamics of the basic technological processes". Feng. Kazan, 2002, C-337 - prototype).

The disadvantage is that the mixing of drainage water containing significant amounts of petroleum products (up to 30-40%) and impurities (iron sulfide and others, up to 2000 mg/DM3), with commercial oil emulsion leads to rapid contamination of mechanical impurities and stabilizing the emulsion. Demolitia becomes impossible even with a considerable increase in temperature and concentration of demulsifier. This causes a sharp decrease in the efficiency of the dehydration process and can lead to failure of the mode of preparation of oil.

In every the reteni solves the problem of increasing the efficiency of separation of oil-water emulsion at the stage of preliminary dehydration oil and water, the stabilization of the speed of hot dehydration, desalting of crude oil and prevent the growth of the number of intermediate layers consisting of stable emulsions.

The task is solved in that in the method of collection and treatment of drainage water, including supply oil emulsion coming from the oil fields, in units preliminary water discharge, separation of the water from the oil emulsion in the apparatus of the preliminary discharge and the discharge of water treatment plants, cold separation of gas from oil emulsion in the buffer tanks, heating oil emulsion in heat exchangers and furnaces, hot air dehydration of petroleum emulsions on the steps of hot sludge, desalting oil emulsion in dehydrators with submission in the dehydrators through disperser fresh water supply drainage water after the hot sludge and dehydrators in the beginning of the process the apparatus of the preliminary discharge, the flow of the dehydrators of finished oil through the heat exchangers in the buffer capacity of the finished oil, hot gas separation in the buffer containers of finished oil and pumping the oil to the consumer, according to the invention the apparatus of the preliminary discharge is divided into two stages, the first stage operate in normal mode with feed oil emulsion from the fields to their input and out devices will prefix inogo water in the buffer tank, the second stage tie parallel to the first step, eliminate the supply of oil emulsion coming from the fields, to the input of the second stage of the apparatus of initial water, drainage water after the hot sludge and dehydrators are served at the input of the second stage of the apparatus of initial water, not mixing with the oil-water emulsion coming from the fields, from the second-speed devices preliminary water produce a discharge of some water treatment plants and the supply of oil emulsion to the input buffer, the input of the drainage water to the input of the second stage of the apparatus of the preliminary discharge is performed via the lower liquor-dispenser apparatus under a layer of water cushion, and technological process in the second stage of the apparatus of the preliminary discharge is carried out at a temperature of 50-80°C.

The invention

Almost all oil treatment plants water drained from the steps of hot dehydration and demineralization due to the high content of oil products (up to 30-40%), treated again, returning it to the stream oil emulsion coming from the oil fields. However, the mixing of commercial emulsion with drainage water containing mechanical impurities (iron sulfide and others, up to 2000 mg/DM3), often resulting stabilizati the oil emulsion, the increase in the thickness of the intermediate layer, the reduction in the rate of its destruction and at a certain thickness the complete suppression of the transition of the globules of the dispersed phase in the layer of water in the settling apparatus. This, in turn, leads to a decrease in the efficiency of the process of the preliminary dewatering boreholes, return with the oil phase and the accumulation of mechanical impurities on the steps of hot dehydration and desalting. Thus, increasing the thickness of the intermediate layers in devices hot dehydration and desalting and increases the risk of failure of the technological mode of oil treatment plants.

In the proposed invention solves the problem of increasing the efficiency of separation of oil emulsion at the stage of preliminary dehydration oil and water, stabilize the operation speed hot dehydration, desalting of crude oil, Department of mechanical impurities and prevent the growth of the number of intermediate layers consisting of stable emulsions.

To solve this problem, the reset drains from the steps of hot dehydration and desalting is carried out in a separate settling apparatus, not mixed with oil-water emulsion coming from the fields. The effectiveness of the proposed method for the preparation of drainage water is also achieved by maintaining high the th temperature of the process (50-80° C). For more effective cleaning of drains from mechanical impurities enter the drainage water into the machine through the bottom liquor distributor under a layer of water pillows. The capacity of the apparatus is selected based on the amount of discharged drainage and laboratory results. Oil from the device is sent to the buffer capacity of raw material pump, water with a high content of mechanical impurities drains to the treatment plant. In the result, it is possible to increase the efficiency of the preliminary stage of dehydration, to stabilize the operation of stages of hot dehydration and demineralization due to the conclusion of the process oil to 90% solids. Thus, in the apparatus of the oil treatment plants eliminated the possibility of growth in the number of intermediate layers, which, when the accumulation result in the disruption of the technological mode. Preparation of drainage water and the Department of mechanical impurities while passing through the water cushion at a higher temperature than in the AIDS stage of preliminary dehydration and without mixing with the incoming oil fields with raw materials, is much more effective. The proposed method, if necessary, allows the processing drainage water and other chemicals separately from the total flow of raw materials.

Techno is agicheskii process is represented in the drawing.

The apparatus of the preliminary discharge is divided into two stages. Oil emulsion with oil fields are directed to apparatuses preliminary water discharge of the first stage 1. Separating water from the apparatus prior to water discharge of the first stage 1 with an oil content of up to 500 mg/DM3serves for treatment at the treatment facility. Watercut oil emulsion after apparatuses preliminary water 1 stable and up to 5%. After apparatuses preliminary water 1 oil emulsion is sent to a buffer tank 2, where is the cold gas separation and where oil emulsion raw pump 3 pump through the heat exchanger 4 where it is heated departing from the installation of the finished oil to 25-35°C and sent to the furnace 5. After the furnace 5 is heated to a temperature of 50-80°With oil emulsion passes through two stages of hot sludge 6 and 7 and goes for desalination in the dehydrators 8. To the best of desalination in the dehydrators through the dispersant serves up to 5% of fresh water. Drain the water after speed hot sludge 6 and 7 and dehydrators 8 oil content up to 30-40% and mechanical impurities up to 2000 mg/DM3send the unit pre-discharge of the second stage 9, when refilling with oil-water emulsion coming from the fields. Enter Dr. Dre the most important water input to the second stage 9 of the apparatus of the preliminary discharge is performed via the lower liquor-dispenser apparatus under a layer of water cushion, and technological process in the last stage of the apparatus of the preliminary discharge is carried out at a temperature of 50-80°C. the Oil from the unit 9 is sent to the buffer capacity of 2 raw pump 3, and the water with high content of mechanical impurities removed for treatment facilities. Of dehydrators 8 ready oil through the heat exchanger 4 serves in the buffer capacity of the finished oil 10 where do hot-gas separation. The pumping of oil to the consumer produced by the pump 11.

Increase the efficiency of the stage of the preliminary dewatering and stabilization operation speed hot dehydration and desalting in the described method is achieved by eliminating the mixing of drainage water coming from the oil fields of raw materials, the effectiveness of the preparation of the drainage water is achieved by maintaining a high temperature process.

Specific example

On Akbastau training setup sour crude oil (KOPUN) NGDU "Leninogorskneft" failed to prepare the oil until the 1st group-quality. The pre-dehydration (oops) on KOPUN did not provide a clear phase boundary "oil-water". Resulting in automatic drain valves of aldatzeko interface did not work and the operators had to switch to manual re lirovanie work sumps depending on the pressure at the facility. This led to the fact that together with water in the apparatus WWTP was discharging a significant amount of oil (up 8%), worsening the quality of the trained system for reservoir pressure maintenance wastewater. Has been rocked by instability, the process of preparing oil due to ingress of water-saturated emulsion on the hot stage of dehydration.

On KOPUN reset drains from the steps of hot dehydration and desalting was sent to a separate settling apparatus (STS-3), where excluded mixing with oil-water emulsion coming from the fields. The effectiveness of the preparation of the drainage water is achieved by maintaining a high temperature process (50-80° (C), by excluding mixed with the incoming oil fields with raw materials. For more effective cleaning of drains from mechanical impurities enter the drainage water into the machine through the bottom liquor distributor under a layer of water pillows. The capacity of the apparatus is selected based on the volume discharged drainage and laboratory results. Oil from the device is sent to the buffer capacity of raw material pump, water with a high content of mechanical impurities drains to the treatment plant.

As a result of application of this method was able to increase the efficiency level has preliminarily the th dehydration, to stabilize the operation of stages of hot dehydration and demineralization due to the conclusion of the process oil to 90% solids. Thus, using this method on KOPUN in settling devices stopped growing number of intermediate layers consisting of stable emulsions. Preparation of drainage water and the Department of mechanical impurities while passing through the water cushion at a higher temperature than in the AIDS stage of preliminary dehydration and without mixing with the raw material coming from the oil fields, is much more effective. The proposed method, if necessary, allows the processing drainage water and other chemicals separately from the total flow of raw materials.

After the successful implementation of the proposed method of collection and treatment of drainage water from the steps of hot dehydration and desalting provided with the installation without technological breakdowns and achieved stable delivery of the finished oil of the 1st group-quality. There was no need of an overdose of demulsifier, the demulsifier consumption decreased by 15%. The annual economic effect from economies of chemicals amounted to about 2.5 million rubles

The application of the proposed method will improve the separation efficiency of oil-water emulsion at the stage of preliminary mo is of reviving the oil and water, to stabilize the operation of stages of hot dehydration and desalting of crude oil, to separate the solids and to prevent the increase in the number of intermediate layers consisting of stable emulsions.

The method of collection and treatment of drainage water, including supply oil emulsion coming from the oil fields, in units preliminary water discharge, separation of the water from the oil emulsion in the apparatus of the preliminary discharge and the discharge of water treatment plants, cold separation of gas from oil emulsion in the buffer tanks, heating oil emulsion in heat exchangers and furnaces, hot air dehydration of petroleum emulsions on the steps of hot sludge, desalting oil emulsion in dehydrators with submission in the dehydrators through disperser fresh water supply drainage water after the hot sludge and dehydrators in the beginning of the process on the apparatus prior to water discharge, supply of electrical dehydrators finished oil through the heat exchangers in the buffer capacity of the finished oil, hot gas separation in the buffer containers of finished oil and pumping the oil to the consumer, characterized in that the apparatus of the preliminary discharge is divided into two stages, the first stage operate in normal mode with feed oil emulsion from the fields to their entrance and from the apparatus is in the initial water in the buffer tank, the second stage tie parallel to the first step, eliminate the supply of oil emulsion coming from the fields, to the input of the second stage of the apparatus of initial water, drainage water after the hot sludge and dehydrators are served at the input of the second stage of the apparatus of initial water, not mixing with the oil-water emulsion coming from the fields, from the second-speed devices preliminary water produce a discharge of some water treatment plants and the supply of oil emulsion to the input buffer, the input of the drainage water to the input of the second stage of the apparatus of the preliminary discharge is performed via the lower liquor-dispenser apparatus under a layer of water cushion, and technological process in the second stage of the apparatus of the preliminary discharge is carried out at a temperature of 50-80°C.



 

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