CN100396628C - Treatment method and equipment for fracturing flowback waste water - Google Patents
Treatment method and equipment for fracturing flowback waste water Download PDFInfo
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- CN100396628C CN100396628C CNB031478700A CN03147870A CN100396628C CN 100396628 C CN100396628 C CN 100396628C CN B031478700 A CNB031478700 A CN B031478700A CN 03147870 A CN03147870 A CN 03147870A CN 100396628 C CN100396628 C CN 100396628C
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Abstract
The present invention relates to a treatment method of reverse waste water generated in fracturing construction and a device for treating the reverse waste water generated in fracturing construction by using the method. A common additive agent in fracturing fluid makes the COD<cr> value of the reverse waste water capable of achieving more than 10000 mg/L, which causes difficulty to waste water treatment; coagulating treatment is helpful to the raise of treatment efficiency; internal electrolysis can raise the biochemical availability and remove metal ions; biochemical treatment time can be shortened by using an absorption method; the utilization of a microbial population of cultured and acclimated microorganisms can raise the efficiency of sewage treatment; after sequential use of the methods, the sewage can reach standards and is drained. The device for treating fracturing reverse sewage corresponds to the treatment method and is composed of waste liquid storage tanks with stirrers, an internal electrolysis column, a middle water pool, an activated carbon absorption column, a biochemical pool and a sand filter, and all the tanks, treatment reaction columns and pools are sequentially connected through water pipes or water pipes with pumps.
Description
Technical field:
The present invention relates in the petroleum exploration and development process, a kind of to the pressing crack construction output the treatment process of returning effluent and utilize return the device that effluent handle of this method to pressure break.
Background technology:
In the oil and natural gas exploitation, fracturing technology is a routine techniques measure of well production increment.In brief, it is to utilize high-pressure pump with high viscosity liquid, is pressed into down-hole formation with big discharge capacity, makes formation crack, stratum and is beneficial to the oil gas output.After the pressure break success, fracturing liquid will return ground with other liquid of down-hole.In order to improve fracturing effect, additive commonly used in the fracturing liquid has: tackifier: as hydroxyl guanidine glue, xanthan gum and polyacrylamide etc.; Gel breaker: as carbonic acid ammonia salt, calcium oxide etc.; Buffer reagent: sodium bicarbonate, fumaric acid etc.; Clay stabilizer: calcium chloride, hydroxy aluminum etc.; Flow improver: cationic polyacrylamide etc.Also has sterilant etc. in addition.
Owing to use multiple additives in the pressure break industry liquid, make the COD that returns effluent
CrValue can reach more than the 10000mg/L, causes difficulty to wastewater treatment.
The method of handling at present fracturing outlet liquid has: after simple process such as coagulation, and reinjection into reservoir, its difficulty is that suitable reinjection well will be arranged, and requires the reinjection well distance not far, the re-injection capacity is polluted underground water greatly and not; Other method is with after returning effluent and waste drilling mud mixing, and adds solidifying agent and solidifies the back landfill, and the shortcoming of this method is the cost height.
Because pressure break is returned effluent and belonged to disposable discharging, the water yield is little, is no more than 200m usually again
3, add that the oil well well location disperses, and therefore requires method of wastewater treatment and equipment should meet the requirement of These characteristics.In order to realize environment protection emission, the above-mentioned difficult problem of solution makes treatment effect reach discharging standards GB8978-1996, mainly is the COD that reduces discharge water
CrValue, through multiple sewage water treatment methods such as comparative study coagulation, electrolysis, absorption and biochemical treatments, think that coagulating treatment selects for use the oxidisability coagulant aids to help to improve processing efficiency, interior electrolysis can improve the biodegradability of waste water and remove metal ion, utilize adsorption method can shorten the biochemical treatment time, utilize to cultivate and the acclimated microorganism flora can improve sewage treating efficiency, and formed following pressure break and return the effluent treatment process.
Summary of the invention:
A kind ofly handle the method that pressure break is returned effluent, comprise coagulation, interior electrolysis, adsorption treatment and biochemical treatment process, principal character is to finish sewage disposal according to following treatment step:
A, pressure break is returned effluent carry out coagulating treatment.With the bodied ferric sulfate is coagulating agent, and consumption is 2000～3500mg/L, is coagulant aids with the chlorinated lime, and consumption is 3500～4500mg/L, joins pressure break and returns in the effluent.For quickening settling of floccus, the SW205 setting accelerator that can also add 5 ~ 10mg/L again, the SW205 setting accelerator is the mixture of wilkinite and flyash, (the SW205 setting accelerator is flyash wherein: bentonitic weight ratio=between 2: 1 to 1: 1) stir and wait and coagulate, account for up to the sludge volume that produces and to wash away 25% of volume (the wastewater volume sum behind sludge volume and the coagulation), mud is landfill behind centrifuge dripping.
B, the waste water behind the coagulation is carried out interior electrolysis treatment.With the volume ratio of carbonaceous and iron filings 1: 0.5, with the activator activation, waste water and Fe/C were by being duration of contact 0.5 hour; Waste water elder generation adjust pH, handle pH value to water outlet than the coagulation of introducing after waste water PH increase at 2.5 o'clock and finish; If have Pb in the waste water, metals such as Cr are adjusted to strong basicity with lime with pH, and promptly PH is 10, to remove Pb, metal ions such as Cr.
C, adsorption treatment.To carry out activated carbon adsorption through the waste water after the interior electrolysis and handle, dress granular activated charcoal in the activated carbon adsorption post, the adsorption equilibrium time is 30 minutes.
D, biochemical treatment.The waste water that above-mentioned A, B, C arbitrary steps produce all can carry out biochemical treatment.To add phosphoric acid salt 0.2 gram in the glucose solution of 1000 milliliter of 10% concentration, urea 0.2 gram left standstill in air 7 days, produced the greyish-green cenobium; The pressure break that this cenobium is introduced behind coagulation is returned draining, increase the ratio that pressure break behind the coagulation is returned draining gradually, from 20% to 40%, then 60% to 80%, return draining until 100% pressure break, cenobium is tamed, 3-4 days domestication time, the bacterial classification that domestication back cenobium is used as biochemical treatment; To introduce in the waste water that needs to handle through the bacterial classification after the domestication, the volume ratio of bacterial classification consumption and wastewater flow rate is 1: 500, leaves standstill after mixing, then biochemical beginning, and time of repose is 7 days, aeration in the biochemical treatment process, then biochemical speed improves 1 times; Waste water available filter or sand-bed filter after the biochemical treatment separate water with cenobium.Bacterium can give over to when handling other waste water and use, and waste water can be realized qualified discharge.
Above-mentioned treatment process also can be according to time and funds needs, after the coagulating treatment, electrolysis and adsorption treatment in not carrying out, or only carry out interior electrolysis, do not carry out adsorption treatment, just directly carry out biochemical treatment, such treating processes, as long as the time of corresponding prolongation biochemical treatment, also can realize the sewage qualified discharge.For example, directly carry out biochemical treatment behind the coagulation, under 20 ℃ of conditions, need 30 days, just make COD
CrReduce to below the 100mg/L; If former water is through coagulation → interior electrolysis → absorption → biochemical treatment, and aeration when biochemical, need 7 days only then.
Realize that for convenience above-mentioned pressure break returns the sewer treatment process, every treatment step according to aforesaid method, design the corresponding pressure break of a cover especially and return the sewer treatment unit, this device is made of the waste tank that has agitator, interior electrolysis post, intermediate pool, activated carbon adsorption post, biochemistry pool and sand-bed filter, and is connected successively by water pipe or band water pumping pipe between each jar, the sharp pond of processing reaction post.
Because above-mentioned coagulating treatment and biochemical treatment all can be carried out easy being easy to get in the waste liquid tank in well site or wastewater disposal basin.And interior electrolysis post and activated carbon adsorption post and other annex (intermediate water tank, pump etc.), the well site is not equipped with, and can be installed in a special train as required provides.As long as this car to the well site, is then handled and can be carried out in the locality, exempt waste water transportation problem.
Description of drawings:
Fig. 1, pressure break are returned effluent processing technological flow figure
Fig. 2, pressure break are returned effluent treatment unit synoptic diagram, comprise waste tank (or waste liquid pool), agitator, and interior electrolysis post, intermediate pool (case), the activated carbon adsorption post, biochemistry pool and sand-bed filter are connected in sequence by water pipe and water pump etc.
Embodiment:
Embodiment one
It is as shown in table 1 that the pressure break in certain oil field is returned the main contamination index of effluent.
Table 1 contaminated wastewater index measured value (remove pH, outside the colourity, unit is all mg/L)
| Project | PH value | Petroleum-type | Suspended substance (SS) | S 2- | COD crValue | Volatile phenol | Cr 6+ | Colourity |
| Standard | 6-9 | 10 | 70 | 1.0 | 100 | 0.5 | 0.5 | 50 |
| Actual measurement | 6 | 0 | 727 | 0.24 | 8470 | 1.4 | 1.0 | 52 |
| Actual measurement/standard | - | - | 10.4 | 0.24 | 84.7 | 2.8 | 2 | 1.04 |
As seen from Table 1, COD
CrBe topmost pollutent, the present invention is primarily aimed at COD
CrRemoval be target, at COD
CrIn the process of removing, other pollutes and all obtains removing;
This example adopts coagulation--processing technological flow that interior electrolysis--absorption--is biochemical, and treatment process and result are as follows:
1. coagulation: waste water (COD
Cr=add bodied ferric sulfate 2500mg/L in 8470mg/L), stir, add chlorinated lime 4000mg/L simultaneously, static after, survey supernatant C OD
Cr=4980mg/L, clearance are 41.2%;
2. the coagulation water outlet is by the Fe/C post, and making water and Fe/C duration of contact is 30min, measures the COD of water
Cr=3760mg/L, clearance 9.8%.
3. active carbon adsorption column is passed through in interior electrolysis water outlet, making water residence time in post is 30 minutes, measures water COD
Cr=2650mg/L, clearance are 29.5%;
4. the activated carbon adsorption water outlet is placed jar, carry out biochemical treatment, leave standstill and surveyed a COD in per 4 days
CrValue, its result (service temperature is 18 ± 5 ℃) as shown in table 2.
Table 2 biochemical treatment result and time relation
| Time (my god) | 0 | 4 | 8 | 12 | 16 | 20 |
| COD cr(mg/L) | 2650 | 1050 | 439 | 228 | 101 | 78 |
| Clearance (%) | 0 | 60.5 | 83.4 | 91.4 | 96.2 | 97.1 |
Handle waste water COD by table 2 is as seen biochemical through 16 days
CrCan reach first discharge standard.
Water sample is surveyed every index through sand filtration after the biochemical treatment, all can satisfy the first discharge standard requirement, and is as shown in table 3.
--the sewage index of interior electrolysis--absorption--biochemical treatment that table 3 is through coagulation
| Project | PH | Petroleum-type | Suspended substance (SS) | S 2- | COD cr | Volatile phenol | Cr 6+ | Colourity |
| COD cr(mg/L) | 6.5 | 0 | 0 | 0.1 | 96 | 0.2 | 0.3 | 0 |
Embodiment two
With the effluent of returning of above-mentioned same well, biochemical treatment process is handled to use coagulation--interior electrolysis--.
1. coagulation: waste water (COD
Cr=add bodied ferric sulfate 2500mg/L in 8470mg/L), stir, add chlorinated lime 4000mg/l simultaneously, static after, survey supernatant C OD
Cr=4980mg/L, clearance are 41.2%;
2. the coagulation water outlet is by the Fe/C post, and making water and Fe/C duration of contact is 30min, measures the COD of water
Cr=3760mg/L, clearance 9.8%.
3. by the aforementioned D biochemical treatment step of returning in the sewer treatment process, carry out biochemical treatment, the result is as shown in table 4.
The result of the direct biochemical treatment of table 4 coagulation water outlet
| Time (my god) | 0 | 8 | 16 | 24 | 28 |
| COD cr(mg/L) | 3760 | 1546 | 650 | 124 | 77 |
By table 4 as seen, adopt coagulation--directly biochemical treatment after the interior electrolysis, after 28 days, COD
CrValue has been reduced to below the 100mg/L, can realize qualified discharge.
Embodiment three
With the effluent of returning of above-mentioned same well, coagulation--biochemical treatment process is handled in use.
At first, the coagulation operation is with the 1. coagulation among the embodiment one, water outlet COD
Cr=4980mg/L;
Then, by the aforementioned D biochemical treatment step of returning in the sewer treatment process, carry out biochemical treatment, the result is as shown in table 5.
The result of the direct biochemical treatment of table 5 coagulation water outlet
| Time (my god) | 8 | 16 | 24 | 32 | 40 |
| COD cr(mg/L) | 2780 | 1930 | 1052 | 230 | 64 |
By table 5 as seen, the direct biochemical treatment of coagulation water outlet, after 40 days, COD
CrValue has been reduced to below the 100mg/L, can realize the sewage qualified discharge.
Claims (5)
1. handle the method that pressure break is returned effluent for one kind, comprise coagulation, interior electrolysis, adsorption treatment and biochemical treatment process, it is characterized in that carrying out sewage disposal successively according to following treatment step:
A, pressure break is returned effluent carrying out coagulating treatment, is coagulating agent with the bodied ferric sulfate, and consumption is 2000～3500mg/L, is coagulant aids with the chlorinated lime, and consumption is 3500～4500mg/L, joins pressure break and returns in the effluent; For quickening settling of floccus, add the wilkinite of 5`10mg/L and the mixture of flyash again, stir and wait and coagulate, account for up to the sludge volume that produces and wash away 25% of volume, mud is landfill behind centrifuge dripping;
B, the waste water behind the coagulation is carried out interior electrolysis treatment, adopt 1: 0.5 the Fe/C post of volume ratio of carbonaceous and iron filings, waste water and Fe/C post are by being duration of contact 0.5 hour; Waste water elder generation adjust pH, handle pH value to water outlet than the coagulation of introducing after waste water PH increase at 2.5 o'clock and finish; If have Pb in the waste water, metals such as Cr are adjusted to strong basicity with lime with pH, and promptly PH is 10, to remove Pb, metal ions such as Cr;
C, adsorption treatment will be carried out activated carbon adsorption through the waste water after the interior electrolysis and be handled, dress granular activated charcoal in the activated carbon adsorption post, and the adsorption equilibrium time is 30 minutes;
D, biochemical treatment, phosphoric acid salt 0.2 gram will be added in the glucose solution of 1000 milliliter of 10% concentration, urea 0.2 gram, in air, left standstill 7 days, produce the greyish-green cenobium, this cenobium is introduced pressure break behind coagulation to be returned in the draining and tames, 3 to 4 days domestication time, the bacterial classification that domestication back cenobium is used as biochemical treatment is introduced in the waste water that needs to handle, the volume ratio of bacterial classification consumption and wastewater flow rate is 1: 500, leave standstill after mixing, then biochemical reaction begins, after 16 days, water is separated with cenobium, and waste water is realized qualified discharge.
2. processing pressure break as claimed in claim 1 is returned the method for effluent, it is characterized in that carrying out successively in A step coagulation and the B step after the electrolysis biochemical treatment of D step directly being carried out in interior electrolysis water outlet, prolongs the biochemical reaction time, leaves standstill to be no less than 28 days.
3. processing pressure break as claimed in claim 1 is returned the method for effluent, it is characterized in that carrying out A step coagulation after.The biochemical treatment of D step is directly carried out in the coagulation water outlet, prolonged the biochemical reaction time, leave standstill and be no less than 40 days.
4. return the sewer treatment unit according to the pressure break of the described method of claim 1, it is characterized in that this device comprises the interior electrolysis post of waste tank, Fe/C, intermediate pool, activated carbon adsorption post, biochemistry pool and the sand-bed filter that has agitator, and connect and compose successively by water pipe or band water pumping pipe.
5. pressure break as claimed in claim 4 is returned the sewer treatment unit, it is characterized in that electrolysis post and activated carbon adsorption post in the described Fe/C, and water pipe or band water pumping pipe are provided by vehicle-mounted.
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| CNB031478700A CN100396628C (en) | 2003-06-27 | 2003-06-27 | Treatment method and equipment for fracturing flowback waste water |
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| CNB031478700A CN100396628C (en) | 2003-06-27 | 2003-06-27 | Treatment method and equipment for fracturing flowback waste water |
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| CN100396628C true CN100396628C (en) | 2008-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992524A (en) * | 2012-04-23 | 2013-03-27 | 北京矿冶研究总院 | Treatment method of fracturing flow-back fluid |
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| CN101475290B (en) * | 2009-01-21 | 2010-10-13 | 大庆油田有限责任公司 | Recovery processing process for fracturing return liquid |
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| CN102145952B (en) * | 2010-10-29 | 2012-08-08 | 中国石油集团川庆钻探工程有限公司 | Method for treating fracturing waste fluid during petroleum exploration by performing microwave quick catalysis |
| CN104556492B (en) * | 2013-10-09 | 2016-08-17 | 中国石油化工股份有限公司 | A kind of method of the recycling of fracturing outlet liquid |
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| CN105174657B (en) * | 2015-10-20 | 2017-05-31 | 波鹰(厦门)科技有限公司 | The processing unit and method of a kind of oil extraction waste water |
| CN111170528A (en) * | 2020-02-26 | 2020-05-19 | 江苏森茂能源发展有限公司 | Purification treatment method of organic wastewater with difficultly-degraded oil sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102992524A (en) * | 2012-04-23 | 2013-03-27 | 北京矿冶研究总院 | Treatment method of fracturing flow-back fluid |
| CN102992524B (en) * | 2012-04-23 | 2014-12-17 | 北京矿冶研究总院 | Treatment method of fracturing flow-back fluid |
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