CN106734055A - A kind of on-site treatment method of oil gas field well site oil-based drill cuttings - Google Patents
A kind of on-site treatment method of oil gas field well site oil-based drill cuttings Download PDFInfo
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- CN106734055A CN106734055A CN201611042986.4A CN201611042986A CN106734055A CN 106734055 A CN106734055 A CN 106734055A CN 201611042986 A CN201611042986 A CN 201611042986A CN 106734055 A CN106734055 A CN 106734055A
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- based drill
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- 238000005520 cutting process Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 239000007800 oxidant agent Substances 0.000 claims abstract description 13
- 230000001590 oxidative effect Effects 0.000 claims abstract description 12
- 239000012263 liquid product Substances 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 92
- 238000010438 heat treatment Methods 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 13
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 5
- 238000006731 degradation reaction Methods 0.000 claims description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 claims description 2
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 claims description 2
- 239000000567 combustion gas Substances 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 238000009284 supercritical water oxidation Methods 0.000 abstract description 12
- 239000005416 organic matter Substances 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 239000000047 product Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000012265 solid product Substances 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 1
- 239000001569 carbon dioxide Substances 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000010815 organic waste Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of on-site treatment method of oil-based drill cuttings, belong to technical field of environmental protection in chemical industry.After this method is by oil-based drill cuttings grinding, supercharging, preheating, reactor is mixed into water, oxidant；Organic matter exhaustive oxidation in oil-based drill cuttings is degraded into the inorganic matters such as water, carbon dioxide using the high-efficiency cleaning feature of supercritical water oxidation；Reacted solid product and gas-liquid product are separated in reactor, and respectively from the discharge of upper and lower discharging opening；The product of discharge can be directly discharged in environment or be subject to as needed recycling.Based on the portable compact devices of this method exploitation, can as needed transport to situ of drilling well, realize the treatment in situ to all kinds of oil gas field oil-based drill cuttings, the environmental hazard of oil-based drill cuttings is eliminated from source.
Description
Technical field
The present invention relates to the processing method of oil-based drill cuttings, specially a kind of oil-based drill cuttings produced for oilfield drilling
On-site treatment method, belongs to technical field of environmental protection in chemical industry.
Background technology
Oil-based drill cuttings are the peculiar discarded objects of a class that all kinds of oil gas fields are produced in the drilling process explored and exploit, be by
The aterrimus paste semifluid of oil-based drilling mud and rock debris composition, has been put into China's Hazardous Waste List (HW08).
The environmental hazard of oil-based drill cuttings derives from the organic matter of wherein 5-30% (mass percent), mainly including long chain alkane, side chain
Alkane, benzene homologues and polycyclic aromatic hydrocarbon.In existing treatment technology, oil-based drill cuttings are only confined to certain sky by solidification landfill and re-injection method
It is interior, and do not eliminate its environmental hazard；The methods such as dehydration, dry, chemical washing and pyrolysis are only by having in oil-based drill cuttings
Machine thing is partially separated, and its product still needs to further be processed using other technologies；Biodegradable and burning method can really be realized organic
The degraded of thing, but the former degradation cycle is long and only partial organic substances can be degraded, and the latter then need exclusive incineration place and
Equipment, is also easy to produce secondary pollution.
Supercritical water oxidation is in closed reactor, with supercritical water (P>22.1MPa, T>374 DEG C) it is reaction medium,
In the presence of oxidant (air, pure oxygen etc.), the end treatment technology that organic pollution exhaustive oxidation is degraded.Technology profit
With the low-density of supercritical water, low viscosity and the property such as nonpolar, can be by each type organic deep oxidation in a short time
H2O and CO2Deng inorganic molecules, the reluctant high concentration of other technologies, difficult degradation organic waste are particularly well-suited to.The skill
Art is described as replacing one of most potential organic pollution end treatment technology of burning method.
The content of the invention
In view of the treatment of oil-based drill cuttings at present still lacks efficiently quick, environment-friendly and economically viable degradation technique, this
A kind of method that invention processes oil-based drill cuttings there is provided use supercritical water oxidation, to reach above-mentioned processing requirement, realizes oil base
Treatment in situ of the drilling cuttings in well site.
The present invention provides a kind of on-site treatment method of oil gas field well site oil-based drill cuttings, and the method is related to oil-based drill cuttings to feed
System, water inlet system, four parts of oxidant feed system and overcritical water oxidization reactor, the method specifically include following step
Suddenly：
(1) oil-based drill cuttings that exploitation of oil-gas field is produced are added into ball mill, moisture content, oil-containing according to oil-based drill cuttings
The properties such as rate, select without or add a certain amount of other well site waste water (such as：Flushing fluid, fracturing fluid etc.), by its solid body
Product percentage is adjusted between 10-60%；Polished formation the largest particles particle diameter is not more than 0.1 millimeter, is flowed with certain
The even slurry of property；23-30MPa is forced into by high pressure slurry pump again and is entered heating/heat exchange unit A, made its temperature liter
Height is to 100-400 DEG C；
(2) according to well site actual conditions, the water outlet after selection pure water, well site waste water or this method treatment is stored in aqua storage tank
In, 23-30MPa is conveyed and be pressurized to through high-pressure pump enters heating/heat exchange unit B, its temperature is reached 350-600 DEG C, its body
Product flow is 1-25 times of oil-based drill cuttings；
(3) oxidant (such as pure oxygen, air, oxygen-enriched air and hydrogen peroxide) is stored in holding vessel, is pressurized through booster pump
To 23-30MPa enter heating/heat exchange unit C, its temperature is reached 300-600 DEG C, its flow depend on oil-based drill cuttings flow with
The mistake oxygen amount of setting；
(4) by entering overcritical water oxidization reactor after the oil-based drill cuttings after supercharging, heating, water and oxidant mixing；
Reaction pressure is 23-30MPa, and temperature is 400-600 DEG C, and it is 1.5-5 to cross oxygen amount；By after the reaction of 0.5-30 minutes, oil base
More than 95% organic matter is effectively degraded in drilling cuttings, while solid product is separated with gas-liquid product in reactor,
Respectively from lower discharge port and top discharge mouthful discharge of reactor.
Described oil-based drill cuttings contain substantial amounts of oil-base mud, and after the excellent suspension of oil-base mud is caused to modulate, ground
Oil-based drill cuttings still keep uniformity in a short time；But can not be static for a long time, the time of repose of its before processing is no more than
12 hours, to avoid its sedimentation layering.
Described heating/heat exchange unit is to directly heat the general designation with heat exchange, wherein directly heating including fuel gas buring
Heating, fuel oil combustion heating and electrical heating etc.；Heat exchange feeds using the waste-heat that gas-liquid discharging and solid-liquid discharge.
Described overcritical water oxidization reactor need to possess two kinds of key propertys：Excellent anti-corrosion anti-clogging is super to tackle
The harsh reaction environment of critical oxidation reaction, the safety that in time separates to ensure equipment of the solid with gas-liquid in reactor is surely
Fixed operation.
Described reaction condition, i.e. reaction pressure, temperature, oxygen amount and residence time excessively are according to processed oil-based drill cuttings
What the property such as organism kinds and content determined；General organic matter is more complicated, content is higher, and required reaction temperature is higher, mistake
Oxygen amount is bigger, the residence time is more long；And Stress control has no significant effect within 23-30MPa to reaction effect.
Gas in described discharging is directly vented；Liquid can be discharged directly, or be back to regulation oil-based drill cuttings mobility,
Or reuse in water tank is stored in, or for other purposes of well site；Solid can be discharged directly, or resource is recycled, such as roadbed
Filler, building materials etc..
All kinds of oil gas field oil-based drill cuttings rear degradation effect of organic compound treated by the present method is not less than 95%.
Compact type skid mounted equipment can be developed based on methods described, transport to required well site realizes oil-based drill cuttings just
Ground treatment.Equipment based on methods described exploitation includes following four main part：Oil-based drill cuttings feed system, including ball milling
Machine, high pressure slurry pump and heating/heat exchange unit A；Water feed system, including water tank, high-pressure pump and heating/heat exchange unit B；Oxygen
Agent feed system, including holding vessel, booster pump and heating/heat exchange unit C；And overcritical water oxidization reactor.
This method beneficial effect compared with prior art is：
(1) oil-based drill cuttings cause that routine techniques is difficult to its efficient, thorough, environmental protection because its complicated organic matter is constituted
Treatment, and supercritical Water Oxidation Technology just may be used as one of most promising organic pollution end treatment technology at present
Tackle the difficulty in treatment of oil-based drill cuttings.
(2) oil-based drill cuttings are in itself to go back to ground from the delivered downhole of upper km by high pressure slurry pump, its pumping pressure
Power is suitable with pressure needed for supercritical water oxidation, in addition grinding modulating process of the invention so that supercritical Water Oxidation Technology
High solids content feed problems are addressed.
(3) supercritical Water Oxidation Technology operating cost is slightly higher, and common organic waste is difficult to bear, but oil-based drill cuttings belong to
Dangerous solid waste, its treatment disposal is increasingly taken seriously, the processing cost that can be born apparently higher than common organic waste, i.e., this
Inventive method economically has feasibility.
(4) volume utilization of overcritical water oxidization reactor is high, and the reaction time is short, thus can develop compact type
Reactor, and wheeled apparatus (i.e. skid mounted equipment) is designed to, transport to required well site, the treatment in situ of oil-based drill cuttings is realized,
Save now generally use focus on the great number freight that method is brought.
In sum, the inventive method can be realized to the efficient, quick, thorough, environmentally friendly and economically viable of oil-based drill cuttings
Watershed management.
Brief description of the drawings
A kind of schematic diagram of the on-site treatment method of oil gas field well site oil-based drill cuttings that Fig. 1 is provided for the present invention.Wherein, 1-
Oil-based drill cuttings；2- ball mills；3- high pressure slurry pumps；4- heating/heat exchange units A；5- water；6- water tanks；7- high-pressure pumps；8- adds
Heat/heat exchange unit B；9- oxidants；10- holding vessels；11- booster pumps；12- heating/heat exchange units C；13- supercritical water oxidations are anti-
Answer device；14- top discharges mouthful；15- lower discharge ports.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
A kind of on-site treatment method of oil gas field well site oil-based drill cuttings that the present invention is provided, the method schematic flow sheet is for example attached
Shown in Fig. 1, the oil-based drill cuttings 1 from oil gas field are launched in ball mill 2, are added water and are adjusted its moisture content, are made it have good
Mobility；Uniform slurry is formed it into after grinding after a while, then 23- is pressurized to by high pressure slurry pump 3
30MPa is simultaneously conveyed by heating/heat exchange unit A 4, is preheated to 100-400 DEG C；Synchronous, water 5 is stored in water tank 6, warp
High-pressure pump 7 is pressurized to 23-30MPa, then is preheated to 350-600 DEG C by heating/heat exchange unit B 8；Synchronous, oxidant 9 is stored up
It is stored in holding vessel 10, is pressurized to 23-30MPa through supercharger 11, then 300-600 is preheated to by heating/heat exchange unit C 12
℃；Above-critical state is reached after mixing through the oil-based drill cuttings 1 after supercharging, preheating, water 5 and oxidant 9 and enter supercritical water oxidation
Reactor 13, oil-based drill cuttings are reacted in reactor while realizing that solid is separated with the timely of gas-liquid；Through after a while
React complete afterwards, gas-liquid product is discharged from the top discharge mouthful 14 of reactor, by after the cooling that exchanges heat, gas is directly vented, liquid
Directly discharge or reuse as needed；Solid-liquid product is discharged from the lower discharge port 15 of reactor, by after the cooling that exchanges heat, directly arranging
Put, or resource is recycled as needed.
Embodiment 1 (laboratory scale)
Certain shale gas peupendicular hole oil-based drill cuttings, the mass percent of total organic content 26.2%, reaction condition is set as 550
DEG C, 24MPa, 3 times are crossed oxygen amount, 5 minutes residence times.
The sample of oil-based drill cuttings 1 is placed into ball mill 2, add appropriate pure water by its solids volume percent adjust to
20%, 24MPa is forced into by high pressure slurry pump 3 with 1 l/h of flow after being ground through 3 hours, and by electrical heating
Device 4 is preheated to 150 DEG C；At the same time, pure water 5 passes sequentially through high-pressure pump 7 and combustion heater 8 with 6 ls/h of flow, with
Reach 24MPa and 550 DEG C；At the same time, pure oxygen 9 is forced into 24MPa with 0.7 kg/hr of flow by booster pump 11, then
330 DEG C are reached by heat exchanger 12 and gas-liquid discharging heat exchange；The mixing of oil-based drill cuttings 1, water 5 and oxygen 9 reaches 410 DEG C and enters the excess of imports faces
Boundary water oxidation reactor 13, because exothermic heat of reaction inside reactor temperature is stepped up to 550 DEG C, during by the stop of about 5 minutes
Between, solid and gas-liquid separation；Gas-liquid product is discharged from top discharge mouthful 14, further cold by cooling water again after being exchanged heat with pure oxygen
But；Solid-liquid discharging is discharged from lower discharge port 15, directly by cooling down water cooling.Through analysis, the organic matter removal in oil-based drill cuttings
Rate about 95%；Water outlet reaches《GB8978-1996 integrated wastewater discharge standards》Grade III Standard；Organic matter quality in solid residue
Percentage is less than 1%, is recycled as well site roadbed building materials.
Embodiment 2 (laboratory scale)
Certain shale gas horizontal well oil-based drill cuttings, the mass percent of total organic content 14.1%, reaction condition is set as 530
DEG C, 25MPa, 3.5 times are crossed oxygen amount, 6 minutes residence times.
The sample of oil-based drill cuttings 1 is placed into ball mill 2, add appropriate fracturing fluid by its solids volume percent adjust to
30%, 25MPa is forced into by high pressure slurry pump 3 with 2 ls/h of flow after being ground through 2 hours, and by electrical heating
Device 4 is preheated to 120 DEG C；At the same time, water outlet 5 after treated by the present method with 8 ls/h of flow pass sequentially through high-pressure pump 7,
The combination 8 of heat exchanger and combustion heater, to reach 25MPa and 580 DEG C；At the same time, pure oxygen 9 is with 1.3 kgs/hr of stream
Amount is forced into 25MPa by booster pump 11, then is preheating to 500 DEG C by electric heater 12；Oil-based drill cuttings 1, water 5 and oxygen 9 are mixed
Conjunction reaches 460 DEG C and enters overcritical water oxidization reactor 13, because exothermic heat of reaction inside reactor temperature is stepped up to 530 DEG C,
By the residence time of about 6 minutes, solid and gas-liquid separation；Gas-liquid product is discharged from top discharge mouthful 14, after being exchanged heat with water inlet again
Further cooled down by cooling water；Solid-liquid discharging is discharged from lower discharge port 15, directly by cooling down water cooling.Through analysis, oil base
Organic removal rate about 97% in drilling cuttings；Water outlet reaches《GB8978-1996 integrated wastewater discharge standards》Secondary standard, can
Reuse as supercritical water oxidation water inlet；Organic matter mass percent is less than 0.8% in solid residue, can directly arrange
Put.
Embodiment 3 (laboratory scale)
Certain shale gas horizontal well oil-based drill cuttings, the mass percent of total organic content 24.5%, reaction condition is set as 400
DEG C, 23MPa, 1.5 times are crossed oxygen amount, 0.5 minute residence time.
The sample of oil-based drill cuttings 1 is placed into ball mill 2, add appropriate fracturing fluid by its solids volume percent adjust to
10%, static 3 hours after being ground through 1 hour, then it is forced into by high pressure slurry pump 3 with 2 ls/h of flow
23MPa, and it is preheated to 100 DEG C by electric heater 4；At the same time, the water outlet 5 after treated by the present method is with 8 ls/h of stream
Amount passes sequentially through the combination 8 of high-pressure pump 7, heat exchanger and combustion heater, to reach 23MPa and 350 DEG C；At the same time, pure oxygen 9
23MPa is forced into by booster pump 11 with 1 kg/hr of flow, then 300 DEG C are preheating to by electric heater 12；Oil base is bored
Bits 1, water 5 and the mixing of oxygen 9 reach 280 DEG C and enter overcritical water oxidization reactor 13, because of exothermic heat of reaction inside reactor temperature
400 DEG C are stepped up to, by the residence time of about 0.5 minute, solid and gas-liquid separation；Gas-liquid product is from top discharge mouthful 14 rows
Go out, further cooled down by cooling water again after being exchanged heat with water inlet；Solid-liquid discharging is discharged from lower discharge port 15, directly by cooling water
Cooling.Through analysis, the organic removal rate about 95% in oil-based drill cuttings；Water outlet reaches《GB8978-1996 integrated wastewaters discharge mark
It is accurate》Secondary standard, can reuse as supercritical water oxidation water inlet；Organic matter mass percent is less than in solid residue
1%, can directly discharge.
Embodiment 4 (laboratory scale)
Certain shale gas horizontal well oil-based drill cuttings, the mass percent of total organic content 30.2%, reaction condition is set as 600
DEG C, 30MPa, 5 times are crossed oxygen amount, 30 minutes residence times.
The sample of oil-based drill cuttings 1 is placed into ball mill 2, add appropriate fracturing fluid by its solids volume percent adjust to
60%, static 10 hours after being ground through 2 hours, then it is forced into by high pressure slurry pump 3 with 2 ls/h of flow
30MPa, and it is preheated to 400 DEG C by electric heater 4；At the same time, the water outlet 5 after treated by the present method is with 8 ls/h of stream
Amount passes sequentially through the combination 8 of high-pressure pump 7, heat exchanger and combustion heater, to reach 30MPa and 600 DEG C；At the same time, pure oxygen 9
30MPa is forced into by booster pump 11 with 1 kg/hr of flow, then 600 DEG C are preheating to by electric heater 12；Oil base is bored
Bits 1, water 5 and the mixing of oxygen 9 reach 500 DEG C and enter overcritical water oxidization reactor 13, because of exothermic heat of reaction inside reactor temperature
600 DEG C are stepped up to, by the residence time of about 30 minutes, solid and gas-liquid separation；Gas-liquid product is from top discharge mouthful 14 rows
Go out, further cooled down by cooling water again after being exchanged heat with water inlet；Solid-liquid discharging is discharged from lower discharge port 15, directly by cooling water
Cooling.Through analysis, the organic removal rate about 95% in oil-based drill cuttings；Water outlet reaches《GB8978-1996 integrated wastewaters discharge mark
It is accurate》Secondary standard, can reuse as supercritical water oxidation water inlet；Organic matter mass percent is less than in solid residue
1%, can directly discharge.
Finally it should be noted that, although above-described embodiment is only laboratory scale, but confirmed the inventive method can
Row, its general principle for including has the potentiality of enlarged experiment and commercial Application.It is every with present invention as general principle
Obvious change or change still in the protection domain of the application type among.
Claims (9)
1. the on-site treatment method of a kind of oil gas field well site oil-based drill cuttings, it is characterised in that the method comprises the following steps：
(1) after oil-based drill cuttings are no more than 0.1 millimeter through ball mill grinding to the largest particles particle diameter, it is pressurized to by high pressure slurry pump
23-30MPa, then it is preheated to 100-400 DEG C by heating/heat exchange unit A；
(2) water is stored in water tank, is pressurized to 23-30MPa through high-pressure pump, then be preheated to 350- by heating/heat exchange unit B
600℃；
(3) oxidant is stored in holding vessel, is pressurized to 23-30MPa through supercharger, then be preheated to by heating/heat exchange unit C
300-600℃；
(4) overcritical water oxidization reactor, reaction temperature are entered after mixing through the oil-based drill cuttings after supercharging, preheating, water and oxidant
It is 400-600 DEG C to spend, and reaction pressure is 23-30MPa, and oxidant peroxide ratio is 1.5-5, and the residence time is 0.5-30 minutes, instead
Gas-liquid product is discharged from the top discharge mouthful of reactor after answering completely, and solid-liquid product is discharged from the lower discharge port of reactor.
2. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that the oil base
Drilling cuttings is all kinds of oil gas fields because of liquid caused by oil-based drilling mud or semifluid shape discarded object.
3. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that according to described
The mobility of oil-based drill cuttings, selects without or adds a certain amount of other waste water of well site, adjusts its solids volume percent and exists
Between 10%-60%, oil-based drill cuttings after grinding time of repose before treatment is no more than 12 hours.
4. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that the water is
Pure water, well site waste water or it is treated by the present method after water outlet, its volume flow is 1-25 times of oil-based drill cuttings.
5. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that the oxidation
Agent is the hybrid oxidant of one or more in pure oxygen, air, oxygen-enriched air, hydrogen peroxide.
6. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that it is described plus
Heat/heat exchange unit A, heating/heat exchange unit B and heating/heat exchange unit C refer to that all kinds of use combustion gas, fuel oil or electricity are directly heated, or
The heat exchange that the waste heat that person is discharged using gas-liquid or solid-liquid discharges passes through heat exchanger.
7. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that described super to face
Boundary's water oxygen reaction utensil is for two kinds of key propertys：One is excellent anti-corrosion anti-clogging, two be solid with gas-liquid in reactor
It is interior to be separated and discharged respectively.
8. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that all kinds of oil gas
Oil-based drill cuttings rear degradation effect of organic compound treated by the present method in field is not less than 95%.
9. the on-site treatment method of oil gas field well site according to claim 1 oil-based drill cuttings, it is characterised in that based on described
Method can develop compact type skid mounted equipment, can transport to required well site and realize the treatment in situ of oil-based drill cuttings, the equipment
Specifically include：
(1) oil-based drill cuttings feed system, including ball mill, high pressure slurry pump and heating/heat exchange unit A；
(2) water feed system, including water tank, high-pressure pump and heating/heat exchange unit B；
(3) oxidant feed system, including holding vessel, booster pump and heating/heat exchange unit C；
(4) overcritical water oxidization reactor, including top discharge mouthful and lower discharge port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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