CN1502564A - Method and equipment for oil field waste water treatment - Google Patents

Method and equipment for oil field waste water treatment Download PDF

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Publication number
CN1502564A
CN1502564A CNA021491674A CN02149167A CN1502564A CN 1502564 A CN1502564 A CN 1502564A CN A021491674 A CNA021491674 A CN A021491674A CN 02149167 A CN02149167 A CN 02149167A CN 1502564 A CN1502564 A CN 1502564A
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China
Prior art keywords
water
oil
oil field
welded
plate
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CNA021491674A
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Chinese (zh)
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CN1216813C (en
Inventor
任连锁
张登庆
陈毅忠
裴俊峰
王车礼
郭迎庆
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JIANGSU PETROLEUM-CHEMICAL COLLEGE
PROSPECTION DESIGN INST JIANGSU PETROLEUM PROSPECTION ADMINISTRATION
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JIANGSU PETROLEUM-CHEMICAL COLLEGE
PROSPECTION DESIGN INST JIANGSU PETROLEUM PROSPECTION ADMINISTRATION
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Priority to CN 02149167 priority Critical patent/CN1216813C/en
Publication of CN1502564A publication Critical patent/CN1502564A/en
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Publication of CN1216813C publication Critical patent/CN1216813C/en
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Abstract

The present invention relates to a treatment method of oilfield waste water, and it is characterized by that the oilfield waste water is fed into electro-floation treatment equipment, after the oilfield waste water is undergone the processes of pre-treating zone treatment and treatment of electro-floation zone equipped with plate electrode, the oilfield produced waer whose water quality can be reached to standard can be obtained. Said invention can implement electro-floation oil removal and electrolytic bactericidal action integration.

Description

A kind of oil field wastewater treatment method and equipment
Technical field
The invention belongs to wastewater processing technology, exactly, is a kind of method and equipment thereof that adopts treating oil field wastewater by electro-float process.
Background technology
In oil-field development, oil field later stage particularly, the oil field will produce a large amount of recovered waters, for many years, the technology pattern of " oil removing section (oil removing ten secondary oil removings) ten fillter sections " is mainly adopted in domestic oil field to produced water disposal, wherein " oil removing section " adopts following method substantially: (1) physics method is primarily aimed at the oil slick in the former water; (2) chemical method mainly solves the dispersed oil in the former water; (3) coarse method is primarily aimed at the dispersed oil in the former water; (4) cyclonic separation method is mainly removed the oil slick in the former water; (5) air supporting method (air soluble method, revulsion) is mainly removed oil slick and dispersed oil in the former water.
Aforesaid method is obtained certain effect to the processing of the recovered water in each oil field, and still along with the raising of injection water quality standard, more and more higher to the requirement of " oil removing section ", the many weak points that exposed in the various treatment processs can not adapt to on-the-spot requirement.For example, the physics method only can be removed oil slick and the macrobead suspended substance in the former water, still need increase the secondary oil removal plant; Chemical method can only solve dispersed oil and the small granular suspended matters in the former water, and oil removal plant of front end is had relatively high expectations, and the factor that restricts the normal operation that adds pharmacy work simultaneously is more, is difficult to meet design requirement; The coarse method, higher to the import water quality requirement, treatment effect is difficult to satisfy follow-up filtration unit requirement; The effect of cyclonic separation method removal suspended substance is relatively poor; Air supporting method (induce flotation, spray flotation), mechanical part is many, and energy consumption is higher, less stable, maintenance capacity is big.
In addition, practice explanation for many years, " medicament adds " work whether normal is one of important factor that determines the produced water disposal effect, also is the lower where the shoe pinches of the long-term water quality reaching standard rate in each oil field.All need add various chemical medicaments in each treatment Technology for Petroleum Water Flooding at present, and at the scene in the actual mechanical process, be that screening, the dosage of medicament, the control that adds point, dosing method, cost, on-the-spot each link such as preparation all may influence treatment effect, make the water quality can not be up to standard.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, propose a kind of method for the treatment of oil field wastewater by electro-float process.
Another object of the present invention is to propose a kind for the treatment of oil field wastewater by electro-float process device.
Oil field wastewater treatment method of the present invention may further comprise the steps:
1. the oil field waste scale of entering is 200-500m 3The electric floating device pretreating zone of/d by plate washer, enters swash plate, to reduce the waste water oleaginousness significantly;
2. the waste water after step (1) pretreating zone is handled enters the electric floating region processing that is provided with battery lead plate continuously, and its treatment condition are: residence time 5-30min, strength of current 6000~15000A, voltage 3-5V obtain the qualified oil field extracted water of water quality at last.
Treating oil field wastewater by electro-float process device of the present invention is the horizontal circular container, inside is divided into pretreating zone and electric floating region, wherein pretreating zone comprises water inlet pipe and is welded on the container, two plate washers on the following inwall and be welded in swash plate on two plate washers horizontal by 45~60 ° of angles, electric floating region comprises and being welded on respectively on the container, the plate washer of following inwall, be fixed on battery lead plate on the container inner wall with insulating material being provided with the bottom with the immediate plate washer of pretreating zone place, and container inner wall has been equipped with the effluent trough (pipe) of controlling the water level effect before water outlet, and the container top of this external pretreating zone and electric floating region is welded with two and collects the oil slick oil-collecting bag that floats in the recovered waters.
Described electrode materials comprises platinum electrode, Graphite Electrodes, the ferroelectric utmost point, aluminium electrode, preferably plates ruthenium titanium electrode, and the quantity of battery lead plate is relevant with unit scale and size of current, and the distance between the pole plate is 1-2cm.
Described swash plate material is that non-metallic material or stainless material are made.
Advantage of the present invention and effect:
Method of the present invention can realize that electric floating oil removing and electrolytic sterilizing are integrated, and oil removal rate is greater than 90%, and the degerming rate is greater than 99%.According to the pneumatically supported principle of electricity: electric floating in the hydrogen gas bubbles diameter be generally 10-30 μ m, bubble diameter such as oxygen, chlorine is 20-60 μ m, microbubble has very high specific surface area, tiny oil droplets and suspended substance in can planar water, arrive several thousandths because the density of microbubble only be the hundreds of of the density of water, be easy to oil droplet and suspended substance be isolated water body and remove; Multiple strong oxidizing property materials such as anode produces oxygen, chlorine have stronger germicidal action, and chlorination is not realized the sterilization purpose.In oil field extracted water, on average at 4000-10 ten thousand mg/l, specific conductivity is bigger for salinity, uses electricly can regulate the relation that the pole piece spacing changes voltage and current density when floating, needn't add medicament again and regulate specific conductivity, has certain advantage during use; Use electric float method can remove suspended substance and oil slick, dispersed oil effectively, use flocculation agent or add flotation agent, can also remove dispersed oil and be partly dissolved oil; Owing to contain a large amount of chlorions in the recovered water, thereby, discharge a large amount of chlorine at electrode and reach the sterilization purpose, therefore, the present invention can guarantee under the effluent quality prerequisite up to standard, has solved " bottleneck " problem that each oil-field water of the restriction whole nation is handled, when realizing need not adding various medicaments in the wastewater treatment process, reduce processing cost significantly, simplified requirement execute-in-place.
Description of drawings
Fig. 1 handles the electric floating apparatus structure synoptic diagram of oil field waste for the present invention.
By shown in Figure 1, the electric floating oil removal plant of the present invention is a horizontal circular container 10, interior part pretreating zone and electric floating region 15, wherein pretreating zone comprises water inlet pipe 1 and is welded on respectively on the container 10, plate washer 2 on the following inwall, 4, plate washer 2, be welded with swash plate 3 on 4 horizontal by 45~60 ° of angles, described electric floating region, on container 10, following inwall is welded with plate washer 5 respectively, 7, be provided with the bottom near plate washer 5 and be fixed on electrode 6 on the wall of a container with insulating material, wall of a container before rising pipe 9 is welded with the effluent trough 8 of control water level, at pretreating zone and electrically floating region top the oil-collecting bag 11 of collecting oil slick is set respectively, 12, baffle plate 4, be water (flow) direction control and water distributing area 13 between 5.
Oil field waste specifically flows to: oil field waste at first enters cloth pool 14 by water inlet pipe 1, climb over baffle plate 2 then, enter swash plate 3, make oily(waste)water at swash plate 3 sharp separation, most of oil slick floats to oil-collecting bag 11, other dispersed oil and part oil slick enter electric floating region 15 with current by voltage stabilizing district 13, its operational condition: unit scale Q=200~500m 3/ d, residence time 5-30min, strength of current 5000~15000A, voltage 3-5V, produce a large amount of micro bubbles at electrode 6, oil slick in the sewage, most of dispersed oil and part oil in water emulsion float with fine bubble, sticking float on the micro bubble and brought to the water surface, oil slick enters oil-collecting bag 12, oil-collecting bag 11,12 tops are provided with oil outlet (not marking), and the sewage after the processing is by effluent trough or manage 8, takes device out of by rising pipe 9.
Embodiment
Further specify characteristics of the present invention below by specific examples
Example 1-10 is the static test data, is to carry out in the synthetic glass experimental installation, because it is less to handle the water yield, current sinking is limited, if at 200-500m 3The scale of/d and under dynamic condition, total electricity will increase substantially.
Example 1-3
Example 1-3 is the oil field extracted water of oleaginousness 53.90mg/L, and result and operational condition after handling by electric floating oil removal plant of the present invention see Table 1.
Example 4-6
Example 4-6 is the oil field extracted water of oleaginousness 74.20mg/L, sees Table 1 through electric floating oil removal plant result and operational condition.
Example 7-9
Example 7-9 is the oil field extracted water of oleaginousness 132.73mg/L, sees Table 1 through electric floating oil removal plant result and operational condition.
Example 10
This example is the sterilization effect experiment, according to SY/T5329-94 " petroclastic rock reservoir water water quality is recommended index and analytical procedure ", adopts the disappearance dilution method to carry out the sterilization effect experiment, and process object is sulphate reducing bacteria (SRB).
The oil field extracted water bacteria content is 6.0 * 10 6Individual/ml.
Static mode, its operational condition: 5 minutes residence time, electric current 0.8A, polar plate spacing 1cm, voltage 4.0V are adopted in experiment.
The result: the effluent quality bacteria content is less than 6.0/mL, and sterilizing rate is greater than 99.50%.
Example 11
This example is the small-sized dynamic experiment that the experimental installation with the synthetic glass manufacturing carries out.
The water sample of experiment usefulness is a Wang Long village water sample.Experiment condition: flow is 150L/h, power consumption 0.32kwh/m 3, arrhea 5 minutes time, strength of current 6A, voltage 4.20V, it the results are shown in Table 2.As shown in Table 2, the device oil removal rate is better.
Table 1
Example Electric current, I Voltage, V Arrhea the time, divide Go out the saliva oleaginousness, mg/l
????1 ????2 ????3 ????4 ????5 ????6 ????7 ????8 ????9 ????1.5 ????1.5 ????1.5 ????1.5 ????1.5 ????1.5 ????3.0 ????3.0 ????3.0 ????3.85 ????3.85 ????3.85 ????4.70 ????4.70 ????4.70 ????5.0 ????5.0 ????5.0 ????4 ????8 ????12 ????4 ????8 ????12 ????3 ????4 ????5 ????29.1 ????26.3 ????29.3 ????29.2 ????28.3 ????29.3 ????28.89 ????33.89 ????32.22
Table 2
Project The 1st time The 2nd time
Former water oleaginousness, mg/l ????64.26 ????6426
The water outlet oleaginousness, mg/l ????15.65 ????12.36
Oil removal rate, % ????75.6 ????80.8

Claims (2)

1. oil field wastewater treatment method is characterized in that concrete treating processes may further comprise the steps:
(1) the oil field waste scale of entering is 200-500m 3The electric floating device pretreating zone of/d by plate washer, enters swash plate, to reduce the waste water oleaginousness significantly;
(2) waste water after step (1) pretreating zone is handled enters continuously and is provided with the electric floating region processing that spacing is the battery lead plate of 1-2cm, its treatment condition are: residence time 5-30min, strength of current 5000~15000A, voltage 3-5V obtain the oil field extracted water of water quality reaching standard at last.
2. in accordance with the method for claim 1, the electric floating device that it is characterized in that described processing oil field waste is horizontal circular container (10), interior part pretreating zone and electric floating region (15), wherein pretreating zone comprises water inlet pipe (1) and is welded on respectively on the container (10), plate washer (2 on the following inwall, 4), plate washer (2,4) be welded with swash plate (3) on horizontal by 45~60 ° of angles, described electric floating region, on container (10), following inwall is welded with plate washer (5 respectively, 7), be provided with the bottom near plate washer (5) and be fixed on electrode (6) on the container inner wall with insulating material, be welded with the effluent trough (8) of control water level at the preceding container inner wall of rising pipe (9), at pretreating zone and electrically floating region top the oil-collecting bag (11 of collecting oil slick is set respectively, 12), baffle plate (4,5) be water (flow) direction control and water distributing area (13) between.
CN 02149167 2002-11-25 2002-11-25 Method and equipment for oil field waste water treatment Expired - Fee Related CN1216813C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02149167 CN1216813C (en) 2002-11-25 2002-11-25 Method and equipment for oil field waste water treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 02149167 CN1216813C (en) 2002-11-25 2002-11-25 Method and equipment for oil field waste water treatment

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CN1216813C CN1216813C (en) 2005-08-31

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101385910B (en) * 2008-10-17 2010-06-02 扬州澄露环境工程有限公司 Pressure type oil-contaminated water air-float machine
CN101215060B (en) * 2007-12-27 2010-06-09 江苏工业学院 Device for treating oil field waste water
CN101811752A (en) * 2010-03-19 2010-08-25 江苏大学 Restaurant wastewater oil remover
CN101811759A (en) * 2010-03-23 2010-08-25 新疆科力新技术发展有限公司 Electro-flotation testing device for oil field sewage
CN102107998A (en) * 2011-01-14 2011-06-29 武汉江扬水技术工程有限公司 Method for treating low-permeability oilfield reinjection water
CN103112977A (en) * 2013-02-26 2013-05-22 杭州广联新能源科技有限公司 Method for recycling injection polymers by polymer-containing sewage advanced treatment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101215060B (en) * 2007-12-27 2010-06-09 江苏工业学院 Device for treating oil field waste water
CN101385910B (en) * 2008-10-17 2010-06-02 扬州澄露环境工程有限公司 Pressure type oil-contaminated water air-float machine
CN101811752A (en) * 2010-03-19 2010-08-25 江苏大学 Restaurant wastewater oil remover
CN101811759A (en) * 2010-03-23 2010-08-25 新疆科力新技术发展有限公司 Electro-flotation testing device for oil field sewage
CN102107998A (en) * 2011-01-14 2011-06-29 武汉江扬水技术工程有限公司 Method for treating low-permeability oilfield reinjection water
CN103112977A (en) * 2013-02-26 2013-05-22 杭州广联新能源科技有限公司 Method for recycling injection polymers by polymer-containing sewage advanced treatment
CN103112977B (en) * 2013-02-26 2015-04-01 杭州广联新能源科技有限公司 Method for recycling injection polymers by polymer-containing sewage advanced treatment

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