CN203007098U - System for catching and masking heavy metals in drilling wastes - Google Patents
System for catching and masking heavy metals in drilling wastes Download PDFInfo
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- CN203007098U CN203007098U CN 201220639635 CN201220639635U CN203007098U CN 203007098 U CN203007098 U CN 203007098U CN 201220639635 CN201220639635 CN 201220639635 CN 201220639635 U CN201220639635 U CN 201220639635U CN 203007098 U CN203007098 U CN 203007098U
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Abstract
The utility model provides a system for catching and masking heavy metals in drilling wastes. The system comprises a sandstone separating device, a slurry storage and stirring tank, a sludge reaction tank, a dehydration device and a precipitation tank, wherein a pH regulator, an oxidizer and a heavy metal catching agent are added into heavy metal elements in the drilling wastes in batches for combining with the heavy metal elements to become organic sulfur heavy metal chelates, and then composite flocculation is performed for realizing destabilization and solid-liquid separation. After mechanical dehydration, solid separated matters are used for repairing roads, filling fields or returning fields in the form of mud cakes. According to the system, the heavy metal elements in the drilling wastes are transformed to heavy metal organic sulfides with high chemical stability, the heavy metals are prevented for polluting soil and ground water, and a masking effect is further realized.
Description
Technical field
The utility model relates to and effluxes danger treatment of wastes produced, particularly a kind of seizure of drilling wastes heavy metal and masking system in the oilfield drilling process.
Background technology
Drilling wastes is one of primary pollution source of industrial gas oil, and it is a great problem that perplexs at present the oil field that its refuse is processed." mud that waste drilling fluids disposal produces " (refuse code 071-002-08) listed in national Hazardous wastes item in 2008 " national Hazardous Waste List ", wherein, heavy metal is one of principal pollutant composition in waste drilling mud.
According to domestic each oil drilling mud composition data statistics analyse, heavy metal is distributed widely in waste drilling mud, and outside desilver, the metal with hazardness that some are common almost all detects trace, as Zn, Pb, Cu, Ni, Hg, As, Cr etc.In waste drilling mud, metal ion content is higher, analyze due to its reason factor that associated minerals matter background content is higher in the well sites water of productive use, major cause is also relevant with the use of various additives.These metallic elements may be to follow drilling mud additives, basis to add material to enter system, may be also by carrying out in the stratum with drilling cuttings.
Show according to related documents, heavy metal element in waste drilling mud exists with 6 kinds of states usually, heavy metal in waste water mainly exists with soluble state and ion-exchange state, and in waste drilling mud, heavy metal exists mainly with ADSORPTION STATE, complex state, carbonate attitude and residual form.Cr is principal pollutant, and Pb, Zn content are also high.Cr, Zn and organism binding ability are stronger, thereby the large amount of organic in mud all plays an important role to existence, migration and the accumulation etc. of heavy metal.Cu mainly exists with the form of being combined with organism, and in residue, content is higher, may be relevant with the existence form of sulfide, oxyhydroxide.Cd is biological required trace element, and it almost completely exists with form commutative and that be combined with carbonate.
The most water-based muds that adopt of China's land oil gas well drilling mud.The processing mode of well drilling waste mud is two kinds of backfill processing and solidification treatment normally.
Backfill is processed: first will store the clarification of water (adding in case of necessity flocculation agent) on settlement separate in hole drilling mud top, and after reaching set quota, discharge on the spot; Remaining mud treats that it is cured to a certain degree naturally, adds at an upper portion thereof native landfill, and the top keeps the soil layer of 0.5-1.5m, to recover landforms.The method processing cost is lower, is applicable to the fresh water-based drilling mud.
Solidification treatment: this technology is a kind of waste drilling mud treatment technology that grew up in recent years.Its principle is to add the solidifying agent with fixed performance in waste drilling mud, makes it change into similar concrete cured body, fixed its interior objectionable constituent.But the solidification treatment expense is higher, every mouthful of well all need be built suction pit, floor space is large (after generally adopting solidification treatment, because adding cured article can make it increase again by 30% volume on the basis of former mud emission amount), and need to use destabilizing agent, coagulant aids, solidifying agent in the solidification treatment process, treatment effect is more complicated.In solidification method, the heavy metal element soluble state does not change.As time goes on, heavy metal ion can be overflowed with the cured body transudate, and contaminated soil and underground water, risk of environmental pollution are still higher.
The utility model content
The purpose of this utility model is to provide a kind of seizure and masking system of drilling wastes heavy metal, and heavy metal element in drilling wastes is made it to be combined into the organosulfur heavy metal chelate by adding chemical agent, then separates entering mud cake through solid-liquid.
Heavy metal sulfide has good chemical stability, except manganese sulfide, nickelous sulfide, zinc sulphide etc. are dissolved in dilute hydrochloric acid, all the other harmful heavy metal sulfide can only be dissolved in even chloroazotic acid of concentrated hydrochloric acid, the vitriol oil, eliminate the possibility of harmful heavy metal at the soil intermediate ion, cut off heavy metal by the possibility of plant absorbing enrichment transfer and polluted underground water.
The technical solution of the utility model is as follows:
A kind of seizure of drilling wastes heavy metal and masking system as shown in Figure 1, comprising:
One sand-gravel separation device is used for receiving drilling wastes, add water stir sieve after, wherein oarse-grained landwaste separates with sandstone and wash after discharge;
One mud stores stirred pot, its entrance with communicate with sand-gravel separation device outlet, the mud that enters with whipping appts after mud after washing the slurry that produces and remove sandstone by sand-gravel separation device mixes stores in stirred pot, add pH adjusting agent adjusting pH value to 6～8 and oxidizer in batches and reduce its COD value, then add the heavy metal chelating agent solution, heavy metal reaction in heavy metal chelating agent (broad spectrum type) and mixed serum is combined into the organic heavy metal inner complex;
One slurry reaction tank, its entrance is connected by pipeline with the outlet that mud stores stirred pot, and the mud mixed solution of getting rid of heavy metal is added respectively flocculation agent and flocculation agent, and carry out composite flocculation and process, and stirring at low speed, it is taken off fully steady;
One takes off dried equipment, and its entrance is connected by pipeline with the outlet of slurry reaction tank, carries out solid-liquid separation to taking off steady mud after fully.
The utility model also comprises a setting tank, and takes off dried equipment connection, and the water after using through above-mentioned steps is carried out precipitation process; And with the tank connected reuse water tank of precipitation, the sand-gravel separation device etc. that the water after precipitation is transported to system partly recycles.The utility model also comprises a transfer roller, communicates with the entrance of sand-gravel separation device.Wherein the reuse water tank is connected by the pipeline that communicates with transfer roller, is connected stirred pot with sand-gravel separation device with mud and is connected by the pipeline that communicates.
Go out the machine mud cake and reach agricultural mud standard, repair the roads for mud cake and pad the field or go back the field.
Above-mentioned sand-gravel separation device is that drilling wastes is carried out pretreated device, to the seizure of heavy metal with shelter and carry out pre-treatment.Drilling wastes directly enters or enters sand-gravel separation device by front rolling equipment (as worm conveyor etc.), ratio take drilling wastes and water is sieved as 1:1～1:5 adds the water stirring, with particulate separation such as a large amount of landwaste of containing in mud and sandstones out, alleviate, reduce such material to the impact of subsequent disposal, form new dilution mud.
The sand-gravel separation device that the utility model adopts can manufacture and design according to the sand-gravel separation device described in Chinese patent ZL200910082930.5, ZL200920107714.7 and ZL200920107713.2.
Sand-gravel separation device can make drilling well efflux particle diameter in discarded slurry at 5mm(1mm even) more than landwaste and sand grains break away from slurry, and the landwaste after separating, washing and sandstone can reach emission standard (execution detection method: GB5086.3-1997 solid waste Leaching, leaching method--horizontal succusion; The first class index of operative norm " integrated wastewater discharge standard---GB8978-1996 ").Simultaneously, residue slurry denseness is reduced becomes liquid preferably, exports by slush pump, enters into step 2) process.
Mud stores the processing in stirred pot, is at first mud to be carried out pH adjust and forced oxidation.The mud of discharging from sand-gravel separation device enters adjusting and the oxide treatment of carrying out pH mud storage stirred pot.What the pH value of adjustment mud was selected usually is hydrochloric acid or sulfuric acid, and injected volume is as the criterion to reach pH6～8; Oxide treatment can adopt hydrogen peroxide or clorox (chlorinated lime), in order to COD and the BOD that reduces mud.The injected volume of oxygenant will be according to adjusting follow-up detected result of taking off the mud cake that dry-cure obtains, and target is to make the mud cake that takes off after dry-cure can reach national environmental standard, usually requires to detect gained COD value≤100mg/L.Generally added the heavy metal chelating agent liquid in 5 minutes after adding pH adjusting agent and oxygenant.
Heavy metal chelating agent is organic sulfide soluble in water, and commercially available have liquid and solid-state two kinds, selects the trapping agent to the heavy metal broad spectrum type.The compound concentration of heavy metal chelating agent liquid is generally 1～10wt%, or presses description of product preparation.Heavy metal chelating agent liquid dosing ratio is definite by in advance drilling wastes being tested, and addition is 10～200mmp usually.
The principle of work of heavy metal chelating agent is, the water-soluble rear generation organosulfur ion of organic sulfide, and the contents of many kinds of heavy metal ion in organosulfur ion pair water has extremely strong capturing ability, is combined into heavy metal organosulfur inner complex.Heavy metal organosulfur inner complex is the chelating group of 1,000,000 grades of heavy metal organic sulfide molecules, adds a small amount of organic or inorganic flocculation agent with the formation flocks, thereby reaches the purpose that captures heavy-metal ion removal.
Storing in stirred pot at mud adds heavy metal chelating agent that the heavy metal element that mud is ionic state (ion-exchange state) is captured rapidly.For being the complex state heavy metal element, the contact break trapping ability is arranged, and the heavy metal element of ADSORPTION STATE is even wrapped up mud particulate formation chelating granule precipitation.
For guaranteeing the reaction times of medicament, mud stores the stirred pot capacity should take off 5～10 times that do the device processes amount greater than subsequent step, and will add pH adjusting agent, oxygenant and heavy metal chelating agent when mud enter mud storage stirred pot in batches.
Establish agitator in the slurry reaction tank, to mud take off surely, preliminary hydro-extraction.In slurry reaction tank exit, slush pump is installed.
Because mud exists with colloidal state, the aqueous solution is difficult for directly sloughing, thereby makes organic and other chemical substance in mud also be difficult to remove.In the slurry reaction tank, mud is carried out composite flocculation, realize breaking surely, solid, liquid is separated.Concrete way is water (reuse water or clear water) dissolving flocculation agent and flocculation agent in different dispensing canisters at first respectively, after the mud of adjusting concentration is injected the slurry reaction tank, pumps into respectively flocculation agent and flocculant solution, stirs 10～15 minutes.
Flocculation agent can adopt polymerize aluminum chloride or poly-ferric chloride, obtain solution concentration 3～8wt%, and preferred 5wt% adds ratio 15% left and right (by the weight ratio of flocculation agent solution based on handled mud).
Flocculation agent can adopt polyacrylamide (molecular weight 8,000,000～1,200 ten thousand) or diallyl dimethyl ammoniumchloride (molecular weight 8,000,000), obtain solution concentration 0.2wt% left and right adds ratio 5% left and right (by the weight ratio of flocculant solution based on handled mud).
In different areas, the different drilling depth dispensing ratios of areal are discrepant, need to determine by test.
Mud dispensing is stirred after 10～15 minutes when mud continues to stir, with slush pump to taking off dried equipment slurry conveyed.
Taking off dried equipment adopts machinery to take off dried method in flocculation water is separated out from solids afterwards.It can be to utilize vacuum suck method or centrifugal separation that the aqueous solution is deviate from that described machinery takes off dried method, take off dried equipment and can select vacuum suck band filter or centrifugal centrifugal dry machine etc., the solid isolate (mud cake) that takes off after doing has reached innoxious, can stack or landfill disposal, and the aqueous solution of separating enters the reuse water tank and recycles after the setting tank collecting precipitation.
Take off the mud cake of doing device fabrication and reach emission standard (execution detection method: GB5086.2-1997 solid waste Leaching, leaching method--horizontal succusion; The first class index of operative norm " integrated wastewater discharge standard---GB8978-1996 ").Reach simultaneously " pollutent control criterion---GB4284-84 in agricultural mud "
Take off the mud cake of dried device fabrication after relevant department's detection is qualified, obtain emission certification.Can repair the roads pad or by standard proportional field also of mud cake.
The utility model is not to extract to the heavy metal in the oilfield drilling waste, but converts it into the high heavy metal organic sulfide of chemical stability, has stoped heavy-metal contaminated soil and underground water, has just played the effect of sheltering.
Description of drawings
Fig. 1 is that the utility model effluxes the system framework figure of offal treatment to drilling well.
Embodiment
Newly-ploughed certain well of PetroChina Company Limited.'s Tarim Oilfield is positioned at the Aksu, Xinjiang Shaya County.The tertiary structure well, design well depth 6845m.
Drilled well bore structure and drilling mud system
Contiguous well uses identical mud system analytical data from same plot, opens one, two opens, three opens mercury in different drilling well period mud stoste, cadmium, lead, zinc, copper, arsenic, total chromium, nickel and exceed standard, and especially opens the later stage, three two and opens the period and exceed standard seriously.The reason of heavy metals exceeding standard has the reason of mud prescription, and is also relevant with stratal configuration.
The workflow of the utility model system is:
1) utilize sand-gravel separation device to receive drilling wastes, add the water stirring and sieve, wherein oarse-grained landwaste separates with sandstone and washs rear the discharge, and the mud after the slurry of washing generation and removal sandstone enters step 2 after mixing);
2) mixed serum enters with the mud of whipping appts and stores in stirred pot, to mixed serum add in batches pH adjusting agent regulate pH value to 6～8 also oxidizer reduce its COD value, then add the heavy metal chelating agent solution, heavy metal reaction in heavy metal chelating agent and mixed serum, be combined into organic heavy metal inner complex Precipitation, the mixed serum after processing is transported to the slurry reaction tank;
3) to step 2) mixed serum after processing carries out composite flocculation; In the slurry reaction tank with whipping appts, add respectively flocculation agent and flocculation agent, stirring at low speed is taken off dried equipment and is carried out solid-liquid separation taking off steady entering after fully;
4) adopt machinery to take off dry method and make the mixed serum after step 3) is processed realize solid-liquid separation, obtain taking off the solid isolate after doing.
Example carries out according to above-mentioned steps 1～4.
In above-mentioned steps 1, the ratio of in the sandstone separator, discarded slurry being carried out 1:1～1.5 is diluted, and simultaneously isolated landwaste is carried out back flushing and removes.Rare mud is pumped in the temporary stirred pot of mud.
Above-mentioned steps 2, mud are kept in and are carried out slurries acid adding accent oxygen when in stirred pot (continuously stirring when mud is arranged), the mud storage is a certain amount of.Add hydrochloric acid to make mud pH=6～8.
Adopt heavy metal chelating agent TMT, preparating liquid concentration 2wt%,, adding proportion is: 80ppm(one opens with two and opens early stage) and, 100～120ppm(two opens the later stage and three and opens).
Stirring intensity-strong, churning time-continuously.
Heavy metal chelating agent all in action, is combined into the heavy metal organosulfur inner complex of high chemical stability with heavy metal ion before and after treatment of mud is broken steady, and is deposited in mud cake after doing taking off.
Above-mentioned steps 3, dosing is taken off surely.
Flocculation agent can adopt polymerize aluminum chloride or poly-ferric chloride, obtain solution concentration 3～8wt%, preferred 5wt%, add ratio one open with two open early stage 5%(by the weight ratio of flocculation agent solution based on handled mud), two to open that the later stage and three opens be 15%.
Flocculation agent can adopt polyacrylamide (molecular weight 8,000,000～1,200 ten thousand) or diallyl dimethyl ammoniumchloride (molecular weight 8,000,000), obtain solution concentration 0.2wt% left and right, add ratio one open with two open early stage 2%(by the weight ratio of flocculant solution based on handled mud), two to open that the later stage and three opens be 5%.
Continuously stirring when steady is taken off in dosing.
Above-mentioned steps 4 adopts belt vacuum filter to take off dried.
Analysis on monitoring result:
1. the heavy metal in the main toxic substance of waste drilling mud, relevant with geologic framework, and is relevant with drilling fluid composition.See Table 1
Content monitoring result in table 1 waste drilling mud former state and dry sample (full degestion)
2. after processing, solids water logging check shows, heavy metal is fixed, and its leach liquor meets danger refuse Leaching standard and the dirty secondary standard of combining fully.See Table 2
Table 2 mud cake water seaoning leach liquor monitoring result unit: mg/L
3. after processing, the imitative acid rain acidleach check of solids shows, heavy metal compound is stable under field conditions (factors).See Table 3
Table 3 mud cake sulfuric acid leaching solution monitoring result unit: mg/L
4. take off dried drainage heavy metal detected result and show, the heavy metal overwhelming majority that contains in discarded slurry in processing is deposited in solid-state form among mud cake, and drainage heavy metal project reaches the dirty secondary discharge standard of combining.In actually operating, drainage recycles.See Table 4
Table 4 takes off dried drainage monitoring result unit: mg/L
Annotate: Data Source: Xinjiang environmental protection science research institute " Tarim Oilfield company of CNPC " drilling wastes do not land treatment technology up to standard " applied research report " 2011.6
Although disclose for the purpose of illustration the utility model and accompanying drawing, but it will be appreciated by those skilled in the art that: in the spirit and scope that do not break away from the utility model and claims, various replacements, variation and modification are all possible, therefore, scope of the present utility model is not limited to embodiment and the disclosed content of accompanying drawing.
Claims (10)
1. the seizure of a drilling wastes heavy metal and masking system, is characterized in that, comprising:
One sand-gravel separation device;
One mud stores stirred pot, and its entrance communicates with exporting with sand-gravel separation device;
One slurry reaction tank, its entrance is connected by pipeline with the outlet that mud stores stirred pot;
One takes off dried equipment, and its entrance is connected by pipeline with the outlet of slurry reaction tank.
2. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, it is characterized in that, also comprise and the setting tank that takes off dried equipment connection, and with the tank connected reuse water tank of precipitation, wherein the reuse water tank is connected stirred pot and is connected by the pipeline that communicates with mud with sand-gravel separation device.
3. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, is characterized in that, described mud stores the stirred pot capacity greater than taking off 5～10 times that do the device processes amount.
4. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, is characterized in that, described to take off dried equipment be that machinery takes off dried equipment.
5. the seizure of drilling wastes heavy metal as claimed in claim 4 and masking system, is characterized in that, it is vacuum suck band filter or centrifugal centrifugal dry machine that described machinery takes off dried equipment.
6. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, is characterized in that, establishes agitator in described slurry reaction tank.
7. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, is characterized in that, described slurry reaction tank exit installation slush pump.
8. the seizure of drilling wastes heavy metal as claimed in claim 1 and masking system, is characterized in that, also comprises a transfer roller, communicates with the entrance of sand-gravel separation device.
9. the seizure of drilling wastes heavy metal as claimed in claim 8 and masking system, is characterized in that, the reuse water tank is connected by the pipeline that communicates with transfer roller.
10. the seizure of drilling wastes heavy metal and masking system as claimed in claim 8 or 9, is characterized in that, described transfer roller is worm conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220639635 CN203007098U (en) | 2012-11-26 | 2012-11-26 | System for catching and masking heavy metals in drilling wastes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220639635 CN203007098U (en) | 2012-11-26 | 2012-11-26 | System for catching and masking heavy metals in drilling wastes |
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| CN203007098U true CN203007098U (en) | 2013-06-19 |
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| CN 201220639635 Expired - Lifetime CN203007098U (en) | 2012-11-26 | 2012-11-26 | System for catching and masking heavy metals in drilling wastes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992558A (en) * | 2012-11-26 | 2013-03-27 | 司军 | Method and system for capturing and masking heavy metal in well drilling wastes |
| CN104817248A (en) * | 2015-04-23 | 2015-08-05 | 荣盛康洁(北京)生物环保科技有限公司 | 'cleaning-centrifuging' oil-sludge treatment process |
| CN106630264A (en) * | 2016-11-29 | 2017-05-10 | 湖州东润环保设备有限公司 | Integral sewage treatment device |
| CN106977071A (en) * | 2017-05-18 | 2017-07-25 | 贵州美瑞特环保科技有限公司 | A kind of new mercurous and heavy metal sewage sludge dehydration minimizing device |
-
2012
- 2012-11-26 CN CN 201220639635 patent/CN203007098U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992558A (en) * | 2012-11-26 | 2013-03-27 | 司军 | Method and system for capturing and masking heavy metal in well drilling wastes |
| CN104817248A (en) * | 2015-04-23 | 2015-08-05 | 荣盛康洁(北京)生物环保科技有限公司 | 'cleaning-centrifuging' oil-sludge treatment process |
| CN106630264A (en) * | 2016-11-29 | 2017-05-10 | 湖州东润环保设备有限公司 | Integral sewage treatment device |
| CN106977071A (en) * | 2017-05-18 | 2017-07-25 | 贵州美瑞特环保科技有限公司 | A kind of new mercurous and heavy metal sewage sludge dehydration minimizing device |
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Owner name: BEIJING HUASHENG KUNTAI ENVIRONMENTAL TECHNOLOGY C Free format text: FORMER OWNER: SI JUN Effective date: 20150601 |
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Address after: 100142 No. 115, Cheng Cheng Road, Beijing, Haidian District, building seven, impression 804, Beijing Patentee after: BEIJING HUASHENG QUEENTEC ENVIRONMENTAL TECHNOLOGY CO.,LTD. Address before: 100142 No. 115, Cheng Cheng Road, Beijing, Haidian District, building seven, impression 804, Beijing Patentee before: BEIJING HUASHENG KUNTAI ENVIRONMENTAL PROT Co.,Ltd. |
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Effective date of registration: 20180911 Address after: 710100 Xi'an, Shaanxi, China's national civil aerospace industrial base two Industrial Road 299, 5, 10301 rooms. Patentee after: BEIJING HUASHENG KUNTAI ENERGY ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 100142 804 impression of building seven, impression No. 115, Fucheng Road, Haidian District, Beijing, 115. Patentee before: BEIJING HUASHENG QUEENTEC ENVIRONMENTAL TECHNOLOGY CO.,LTD. |
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Granted publication date: 20130619 |