CN110318696B - Harmless treatment process for water-based waste drilling fluid - Google Patents
Harmless treatment process for water-based waste drilling fluid Download PDFInfo
- Publication number
- CN110318696B CN110318696B CN201910555205.9A CN201910555205A CN110318696B CN 110318696 B CN110318696 B CN 110318696B CN 201910555205 A CN201910555205 A CN 201910555205A CN 110318696 B CN110318696 B CN 110318696B
- Authority
- CN
- China
- Prior art keywords
- waste
- water
- drilling fluid
- treatment
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 92
- 238000005553 drilling Methods 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000012530 fluid Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000010790 dilution Methods 0.000 claims abstract description 7
- 239000012895 dilution Substances 0.000 claims abstract description 7
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 28
- 239000010881 fly ash Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- 239000011344 liquid material Substances 0.000 claims description 14
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium chloride Substances Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 13
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims description 13
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 13
- 239000000395 magnesium oxide Substances 0.000 claims description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 13
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 13
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- 239000008267 milk Substances 0.000 claims description 9
- 210000004080 milk Anatomy 0.000 claims description 9
- 235000013336 milk Nutrition 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 239000007790 solid phase Substances 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000003002 pH adjusting agent Substances 0.000 claims description 2
- 235000020681 well water Nutrition 0.000 claims 2
- 239000002349 well water Substances 0.000 claims 2
- 238000002360 preparation method Methods 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 8
- 239000002351 wastewater Substances 0.000 abstract description 8
- 239000010865 sewage Substances 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 description 12
- 238000003860 storage Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 239000003814 drug Substances 0.000 description 7
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 230000001687 destabilization Effects 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a harmless treatment process of water-based waste drilling fluid, which comprises 5 steps of dilution and neutralization, gel breaking reaction, centrifugal separation, oxidation treatment and curing treatment, wherein the main indexes of pH value, chroma, COD and the like of the waste drilling fluid waste water and leachate of cured substances after treatment can reach the secondary standard of GB8978-1996 Integrated wastewater discharge Standard; the treated waste liquid can be reused, such as well site slurry preparation water, well site sprinkling, municipal sewage return pipeline and the like.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a harmless treatment process for water-based waste drilling fluid.
Background
After the drilling operation is completed, most of the drilling fluid is usually discarded, which becomes the largest pollution source in the drilling operation. The waste drilling fluid generated by oil field drilling is a main pollution source, and other drilling such as water wells are inferior. The waste drilling fluid of the oil field has complex harmful substance components formed by combining solid phase and liquid phase, and large waste liquid amount, so that the treatment technology has the problems of relatively complex process, expensive treatment agent cost, huge treatment equipment and the like. The main components of the water-based waste drilling fluid for the water well are inorganic salt, alkali, performance additives and the like, still have toxicity of different degrees, and can cause direct and potential damage to the environment. Compared with the oil field oil-based waste drilling fluid, the drilling fluid has the characteristics of low toxicity, small amount and the like.
However, at present, the waste drilling fluid generated by the water well is hardly treated, is completely buried in the field, or is transported and discharged to useless empty spaces such as ditches and the like, finally forms solid waste or dangerous waste deposits, is influenced by infiltration and dripping of surface rainwater, is collected into percolate, and permeates into underground aquifers and other storage spaces, and toxic and harmful components in the percolate cause great pollution to the environment, soil, rivers and underground water. In the field of water wells, research and application examples of harmless treatment formulas of waste drilling fluid are lacked.
With the increasing importance of the country on environmental protection and the increasing environmental awareness of people, the environmental protection pressure of oil field enterprises is getting bigger and bigger. The research and application of the oil-based waste drilling fluid treatment technology have been widely researched and applied in the drilling of domestic oil fields in large scale, and at present, the domestic oil fields have the defects of large volume, high cost, high energy consumption, large treatment capacity, complex treatment process, high later maintenance cost and the like. The yield of the water-based waste drilling fluid of the water well is small, the components of the waste drilling fluid are simple, and the traditional treatment method and equipment for the oil field are not suitable for treating the water-based waste drilling fluid of the water well, so that the research on a harmless treatment technology of the water-based waste drilling fluid is necessary.
Disclosure of Invention
The invention aims to solve the technical problem of providing a harmless treatment process for water-based waste drilling fluid, which has a good treatment effect and avoids environmental pollution.
In order to solve the technical problems, the invention adopts the following technical scheme:
a harmless treatment process for water-based waste drilling fluid is designed, and comprises the following treatment steps:
(1) dilution and neutralization: pumping the waste drilling fluid to be treated into a gel breaking reaction tank, adding water and a pH regulator into the gel breaking reaction tank, and diluting and neutralizing;
(2) gel breaking reaction: adding a gel breaker MgCl into the liquid material obtained in the step (1)2And AlCl3Stirring uniformly, and then standing for reaction; adding lime milk after the reaction is stopped to adjust the pH value of the effluent to be neutral, and then standing and settling;
the gel breaker is MgCl2And AlCl3The adding amount of the mixture is 1-2% of the weight of the liquid material obtained in the step (1), the stirring time after the adding is 10-30min, the rotating speed of a stirrer is 50-100r/min, and the standing reaction time after the stirring is uniform is 12-24 h; standing for 24-48 h;
(3) centrifugal separation: pumping the liquid material obtained in the step (2) into a centrifuge for centrifugal separation, allowing the waste residue obtained by separation to enter a solidification treatment step, and allowing the waste liquid obtained by separation to enter an oxidation treatment step;
(4) oxidation treatment: the waste liquid separated by the centrifuge in the step (3) enters an oxidation reaction settling tank, dilute sulfuric acid is added into the waste liquid to adjust the pH value to be 5, and then H with the concentration of 30 percent is added2O2Adding 10% catalyst FeSO into the solution4·7H2Stirring O solution for 10-30min at the rotation speed of 50-100r/min, standing for oxidation after stirring, standing for reaction for 12-24h, and stoppingAdding lime milk after reaction to adjust the pH value of the effluent to 7; the mud obtained by standing and settling enters a solidification treatment step, and settled effluent reaches the standard and is discharged or recycled;
(5) curing treatment: and (4) placing the waste residues obtained in the step (3) and the slurry obtained in the step (4) into a waste slurry pool, adding a curing agent, curing and burying after reaching the standard.
Preferably, the pH regulator in step (1) is lime milk Ca (OH)2And adjusting the pH value of the waste liquid to 6-10.
Preferably, MgCl is contained in the gel breaker in the step (2)2And AlCl3In a ratio of 1: 0.5-1.
Preferably, the feed liquid flow rate of the centrifuge in the step (3) is 10 m3The rotation speed is controlled at 1800-2200 r/min.
Preferably, in the step (3), when the discharged water is in a dark color or a turbid state after being treated by the centrifuge, adding a gel breaker into an inlet pipeline of the centrifuge, wherein the adding amount of the gel breaker is 1-2% of the weight of the liquid material obtained in the step (2); the gel breaker is MgCl2And AlCl3A mixture of (a).
Preferably, said H in step (4)2O2The addition amount is as follows: adding 30g of waste liquid per liter; the FeSO4·7H2The amount of the O solution added is as follows: 600mg of the FeSO is added into each liter of waste liquid4·7H2The pH of the O solution was 5.
Preferably, in the step (5), the curing agent is fly ash, magnesium oxide and magnesium chloride hexahydrate, and the addition amount is as follows: 36g of magnesium oxide, 16g of magnesium chloride hexahydrate and 35g of fly ash are added into each 100 g of waste solid phase of the well drilling.
Preferably, the adding sequence of the curing agent in the step (5) is as follows: sequentially adding fly ash and magnesium oxide, mixing and stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, adding a magnesium chloride hexahydrate aqueous solution, stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, compacting and molding the mixture, and airing or drying to obtain the final solidified waste.
The harmless treatment process of the water-based waste drilling fluid adopts the following devices: the device comprises a waste drilling fluid pool, a gel breaking reaction tank, an oxidation reaction settling tank, a waste slurry pool and a feeding mechanism; a main feed pump is arranged between the waste drilling fluid pool and the gel breaking reaction tank and is used for conveying the waste drilling fluid into the gel breaking reaction tank; a centrifugal feed pump and a centrifugal machine are arranged between the gel breaking reaction tank and the oxidation reaction settling tank, the centrifugal feed pump is used for conveying liquid materials in the gel breaking reaction tank into the centrifugal machine, a liquid outlet of the centrifugal machine is communicated to the oxidation reaction settling tank through a pipeline, and a waste residue outlet of the centrifugal machine is communicated to the waste slurry pool; the liquid outlet of the oxidation reaction settling tank is connected with an external drainage pump and is used for discharging or recycling the treated clear water after reaching the standard; a slurry outlet of the oxidation reaction settling tank is communicated to the waste slurry pool; the feeding mechanism comprises a plurality of groups of liquid preparation storage tanks, each liquid preparation storage tank is correspondingly connected with a medicament feeding pump, at least one group of dosing mechanisms are correspondingly communicated to the gel breaking reaction tank, and at least one group of dosing mechanisms are correspondingly communicated to the oxidation reaction settling tank.
Furthermore, the feeding mechanism further comprises a clean water tank and a clean water pump correspondingly connected with the clean water tank, and the clean water pump is respectively communicated to the gel breaking reaction tank, the oxidation reaction settling tank and each liquid preparation liquid storage tank through pipelines.
The invention has the beneficial effects that:
(1) by adding MgCl2And AlCl3The mixture gel breaker can quickly realize gel breaking reaction of the waste drilling fluid, realize maximum solid-liquid layering, remove most suspended matters and colloid pollutants in the waste drilling fluid, and reduce the chromaticity index from 100 to 50, which is lower than the allowable discharge standard of 80; meanwhile, COD is also greatly reduced, and the index is reduced to 3500 from the original 15100; wherein, for the bentonite drilling fluid system, MgCl is added2And AlCl3The chroma and COD of the treated mixture gel breaker can directly reach the secondary standard of GB8978-1996 integrated wastewater discharge standard without other subsequent treatment processes.
(2) Adding H under the condition of pH value of 52O2And FeSO4·7H2The mixed oxidant of O can remove a large amount of organic matters dissolved in the waste drilling fluid, the removal rate of COD can reach 92.79 percent, the secondary standard of GB 92.79-1996 integrated wastewater discharge standard can be reached, and the mixed oxidant has stable performance, simple preparation, easy operation and better applicability.
(3) Compared with a single curing agent, the mixed curing agent consisting of the magnesium oxide, the magnesium chloride hexahydrate and the fly ash has an excellent curing and forming effect, wherein a magnesium oxychloride curing material consisting of the magnesium chloride hexahydrate and the magnesium oxide is an air-hardening material and has very high strength, so that the material cured by a magnesium oxychloride composite curing system has higher compressive strength; the fly ash has the cement-like property, can participate in cementation, and realizes the maximum wrapping and consolidation of solid matters in the waste drilling fluid. The treated solid waste can achieve the effects of consolidation forming, hard surface, certain strength and difficulty in crushing by fingers, and meanwhile, the chromaticity, COD and pH value of the leachate all meet the secondary standard of GB8978-1996 Integrated wastewater discharge Standard.
(4) The treatment process has the advantages of simple treatment flow, strong operability and good treatment effect, and can be widely applied to the treatment of the water-based waste drilling fluid.
(5) The waste liquid treated by the harmless treatment process of the water-based waste drilling fluid can be reused, such as well site slurry preparation water, well site sprinkling, municipal sewage return pipelines and the like; the solidified solid waste can be buried in situ, has no adverse effect on the surrounding environment, and finally realizes the harmless treatment of the waste drilling fluid.
Drawings
FIG. 1 is a schematic diagram of the apparatus used in the harmless treatment process of water-based waste drilling fluid according to the present invention;
reference numbers in the figures: 1 abandonment drilling fluid pond, 2 broken glue retort, 3 oxidation reaction settling casks, 4 useless thick liquid ponds, 5 total charge pumps, 6 centrifugal charge pumps, 7 centrifuge, 8 outer discharge water pump, 9 join in marriage liquid storage tanks, 10 medicament charge pumps, 11 clean water jars, 12 clean water pumps.
Detailed Description
The following examples are given to illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention in any way. The apparatus elements referred to in the following examples are, unless otherwise specified, conventional apparatus elements; the industrial raw materials are all conventional industrial raw materials which are sold on the market, if not specifically mentioned.
Example 1: a harmless treatment process of water-based waste drilling fluid comprises the following treatment steps:
(1) dilution and neutralization: pumping the waste drilling fluid to be treated into a gel breaking reaction tank, adding water and a pH regulator into the gel breaking reaction tank, and diluting and neutralizing; the pH regulator is lime milk Ca (OH)2And adjusting the pH value of the waste liquid to 6-10.
(2) Gel breaking reaction: adding a gel breaker MgCl into the liquid material obtained in the step (1)2And AlCl3Stirring uniformly, and then standing for reaction; adding lime milk after the reaction is stopped to adjust the pH value of the effluent to be neutral, and then standing and settling;
the gel breaker is MgCl2And AlCl3The adding amount of the mixture is 1-2% of the weight of the liquid material obtained in the step (1), the stirring time after the adding is 10-30min, the rotating speed of a stirrer is 50-100r/min, and the standing reaction time after the stirring is uniform is 12-24 h; standing for 24-48 h; wherein, MgCl is contained in the gel breaker2And AlCl3In a ratio of 1: 0.5-1.
(3) Centrifugal separation: pumping the liquid material obtained in the step (2) into a centrifuge for centrifugal separation, allowing the waste residue obtained by separation to enter a solidification treatment step, and allowing the waste liquid obtained by separation to enter an oxidation treatment step; the liquid inlet flow of the centrifugal machine is 10 m3The rotation speed is controlled at 1800-2200 r/min.
After the treatment of the centrifuge, when the discharged water is in a dark color or a turbid state, adding a gel breaker into an inlet pipeline of the centrifuge, wherein the adding amount of the gel breaker is 1-2% of the weight of the liquid material obtained in the step (2); the gel breaker is MgCl2And AlCl3A mixture of (a).
(4) Oxidation treatment: the waste liquid separated by the centrifuge in the step (3) enters an oxidation reaction settling tank, dilute sulfuric acid is added into the waste liquid to adjust the pH value to be 5, and then H with the concentration of 30 percent is added2O2Adding 10% catalyst FeSO into the solution4·7H2Stirring the O solution for 10-30min under the condition that the rotating speed of the stirrer is 50-100r/min, standing for oxidation after uniform stirring, standing for reaction for 12-24h, adding lime milk after the reaction is stopped, and adjusting the pH value of the effluent to 7; and (4) allowing the slurry obtained by standing and settling to enter a solidification treatment step, and allowing settled effluent to reach the standard for discharge or recycling. Wherein H2O2The addition amount is as follows: adding 30g of waste liquid per liter; FeSO4·7H2The amount of the O solution added is as follows: 600mg of the FeSO is added into each liter of waste liquid4·7H2The pH of the O solution was 5.
In the oxidation destabilization experiment process, the main factors influencing the effect comprise the concentration of Fe2+, the concentration of H2O2 and the pH value. In order to determine the influence of the factors on the oxidation of the waste drilling fluid, the optimal process conditions are screened out, a three-factor three-level orthogonal experiment table is designed for experiment, and the oxidation characterization destabilization effect is represented by a COD value. The range analysis shows that the factors influencing the stability of the drilling fluid are Fe in turn2+Concentration, H2O2Concentration, pH value. The optimum destabilization reaction condition is that Fe2+600mg/L, H2O230 g/L and a pH value of 5.
The results of the oxidative destabilizing factor level test are shown in table 1 below. The oxidative destabilization orthogonal test results are shown in table 2 below.
(5) Curing treatment: and (4) placing the waste residues obtained in the step (3) and the slurry obtained in the step (4) into a waste slurry pool, adding a curing agent, curing and burying after reaching the standard.
The curing agent is fly ash, magnesium oxide and magnesium chloride hexahydrate, and the addition amount is as follows: 36g of magnesium oxide, 16g of magnesium chloride hexahydrate and 35g of fly ash are added into each 100 g of waste solid phase of the well drilling. The adding sequence of the curing agent is as follows: sequentially adding fly ash and magnesium oxide, mixing and stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, adding a magnesium chloride hexahydrate aqueous solution, stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, compacting and molding the mixture, and airing or drying to obtain the final solidified waste.
The curing agent composed of magnesium oxide, magnesium chloride hexahydrate, fly ash and other components has excellent curing and forming effects, wherein the magnesium chloride hexahydrate has the greatest influence on the curing strength of the waste solid phase of the drilling well, and the magnesium oxide is used secondly. The magnesium oxychloride curing material consisting of the two is an air hardening material, and the main hydration product is 5Mg (OH)2 MgCl2 8H2O (518 phase, also referred to as 5 phase), 3Mg (OH)2 MgCl2 8H2O (318 phase, also called 3 phase), magnesium oxychloride phase and Mg (OH)2The materials have high strength, so the compressive strength of the materials cured by the magnesium oxychloride composite curing system is high; the fly ash has certain inertia, but the potential hydration substances of the fly ash determine that the fly ash can be hydrated under certain conditions, participate in cementation and have the property of similar cement. The fly ash is mainly used for improving the expansion and warpage of the magnesium oxychloride material in the curing process through the filling effect, and simultaneously, the low-temperature hydration activity of the fly ash is utilized to improve the workability of slurry and relieve the damage effect of bentonite particles in drilling mud on the flocculation and agglomeration of cement particles.
The water-based waste drilling fluid innocent treatment device adopted by the treatment process disclosed by the invention is shown in figure 1 and comprises a waste drilling fluid pool 1, a gel breaking reaction tank 2, an oxidation reaction settling tank 3, a waste slurry pool 4 and a feeding mechanism; and a main feed pump 5 is arranged between the waste drilling fluid pool 1 and the gel breaking reaction tank 2 and is used for conveying the waste drilling fluid into the gel breaking reaction tank 2.
A centrifugal feed pump 6 and a centrifugal machine 7 are arranged between the gel breaking reaction tank 2 and the oxidation reaction settling tank 3, the centrifugal feed pump 6 is used for conveying liquid materials in the gel breaking reaction tank 2 into the centrifugal machine 7, a liquid outlet of the centrifugal machine 7 is communicated to the oxidation reaction settling tank 3 through a pipeline, and a waste residue outlet of the centrifugal machine 7 is communicated to the waste slurry pool 4; the liquid outlet of the oxidation reaction settling tank 3 is connected with an external drainage pump 8 for discharging or recycling the treated clear water after reaching the standard; the slurry outlet of the oxidation reaction settling tank 3 is communicated to the waste slurry tank 4.
The feeding mechanism comprises a plurality of groups of liquid preparation storage tanks 9, each liquid preparation storage tank 9 is correspondingly connected with a medicament feeding pump 10, at least one group of dosing mechanisms are correspondingly communicated to the gel breaking reaction tank 2, and at least one group of dosing mechanisms are correspondingly communicated to the oxidation reaction settling tank 3; the feeding mechanism further comprises a clean water tank 11 and a clean water pump 12 correspondingly connected with the clean water tank 11, and the clean water pump 12 is respectively communicated to the gel breaking reaction tank 2, the oxidation reaction settling tank 3 and each liquid preparation liquid storage tank 9 through pipelines. In this embodiment, the liquid preparation storage tanks 9 are four groups, the chemical feeding mechanisms communicated to the gel breaking reaction tank 2 are two groups, and the chemical feeding mechanisms communicated to the oxidation reaction settling tank 3 are two groups.
Wherein the gel breaking reaction tank is a gel breaking reaction tank with a mechanical stirring function and is used for dilution, neutralization reaction and gel breaking reaction, and the effective volume is 15m3Left and right. The total feed pump is used for pumping the waste drilling fluid from the mud pit into the gel breaking reaction tank, and the discharge capacity is 50 m3/h is about. The oxidation reaction settling tank is an oxidation reaction settling tank with a mechanical stirring function and is used for oxidation and settlement, and the effective volume is 10 m33Left and right. The centrifugal machine is used for solid-liquid separation of slurry after gel breaking reaction, ensures that effluent suspended matters reach the standard, and has the treatment capacity of 50 m3And/h, the rotating speed is 1800-2400 r/min, and two centrifuges can be used for exchanging. The centrifugal feed pump is used for discharging the gel breaking reaction tank and feeding the centrifuge with the discharge capacity of 30m3/h is about. The external drainage pump is used for pumping the wastewater after standard treatment, and the discharge capacity is 30m3/h is about. The clean water pump is used for providing water for dilution, oxidant and pH regulator solution preparation, and the discharge capacity is 20 m3/h is about. The agent feeding pump is used for feeding agent solution and comprises a gel breaker, a flocculating agent, an oxidizing agent,pH adjusting agent, etc., with a discharge capacity of 5m3And about/h. The medicament liquid preparation storage tank is used for preparing liquid and storing liquid of solid medicaments and storing liquid of liquid medicaments. The liquid preparation storage tank of the solid medicament is provided with a stirring device, and the effective volume is about 500L.
Representative and common water-based waste drilling fluids were obtained by sampling 5 wells in the south of the river. According to the test steps and the formula of the treating agent, test treatment is carried out, and the main indexes of the pH value, the chroma, the COD (chemical oxygen demand) and the like of the treated waste drilling fluid wastewater and the leachate of a cured substance can reach the secondary standard of GB8978-1996 Integrated wastewater discharge Standard, namely the pH value: 6-9; chroma (dilution factor): 80 times of the total weight; chemical Oxygen Demand (COD): 150 mg/L. The treated waste liquid can be reused, such as well site slurry preparation water, well site sprinkling, municipal sewage return pipeline and the like. The results of the water quality analysis are shown in Table 3 below.
While the present invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various changes can be made in the specific parameters of the embodiments without departing from the spirit of the present invention, and that various specific embodiments can be made, which are common variations of the present invention and will not be described in detail herein.
Claims (3)
1. A harmless treatment process for water-based waste drilling fluid of a water well is characterized by comprising the following treatment steps:
(1) dilution and neutralization: pumping the waste drilling fluid to be treated into a gel breaking reaction tank, adding water and a pH regulator into the gel breaking reaction tank, and diluting and neutralizing;
(2) gel breaking reaction: adding a gel breaker into the liquid material obtained in the step (1), uniformly stirring, and then standing for reaction; adding lime milk after the reaction is stopped to adjust the pH value of the effluent to be neutral, and then standing and settling;
the gel breaker is MgCl2And AlCl3The adding amount of the mixture is 1-2% of the weight of the liquid material obtained in the step (1), the stirring time after the adding is 10-30min, the rotating speed of a stirrer is 50-100r/min, and the standing reaction time after the stirring is uniform is 12-24 h; standing for 24-48 h; MgCl in said breaker2And AlCl3The ratio of (1: 0.5-1);
(3) centrifugal separation: pumping the liquid material obtained in the step (2) into a centrifuge for centrifugal separation, allowing the waste residue obtained by separation to enter a solidification treatment step, and allowing the waste liquid obtained by separation to enter an oxidation treatment step;
after the treatment of the centrifuge, when the discharged water is in a dark color or a turbid state, adding a gel breaker into an inlet pipeline of the centrifuge, wherein the adding amount of the gel breaker is 1-2% of the weight of the liquid material obtained in the step (2); the gel breaker is MgCl2And AlCl3A mixture of (a);
(4) oxidation treatment: the waste liquid separated by the centrifuge in the step (3) enters an oxidation reaction settling tank, dilute sulfuric acid is added into the waste liquid to adjust the pH value to be 5, and then H with the concentration of 30 percent is added2O2Adding 10% catalyst FeSO into the solution4·7H2Stirring the O solution for 10-30min under the condition that the rotating speed of the stirrer is 50-100r/min, standing for oxidation after uniform stirring, standing for reaction for 12-24h, adding lime milk after the reaction is stopped, and adjusting the pH value of the effluent to 7; the mud obtained by standing and settling enters a solidification treatment step, and settled effluent reaches the standard and is discharged or recycled;
wherein said H2O2The amount of solution added was: adding 30g of waste liquid per liter; the FeSO4·7H2The amount of the O solution added is as follows: 600mg of the FeSO is added into each liter of waste liquid4·7H2The pH value of the O solution is 5;
(5) curing treatment: placing the waste residue obtained in the step (3) and the slurry obtained in the step (4) into a waste slurry pool, adding a curing agent, curing and burying after reaching the standard;
the curing agent is fly ash, magnesium oxide and magnesium chloride hexahydrate, and the addition amount is as follows: adding 36g of magnesium oxide, 16g of magnesium chloride hexahydrate and 35g of fly ash into every 100 g of waste solid phase of the well; the adding sequence of the curing agent is as follows: sequentially adding fly ash and magnesium oxide, mixing and stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, adding a magnesium chloride hexahydrate aqueous solution, stirring for 10-30min at a stirrer rotating speed of 50-100r/min, uniformly stirring, compacting and molding the mixture, and airing or drying to obtain the final solidified waste.
2. The harmless treatment process for water well water-based waste drilling fluid as claimed in claim 1, wherein said pH adjusting agent in step (1) is lime milk Ca (OH)2And adjusting the pH value of the waste liquid to 6-10.
3. The innocent treatment process of water well water-based waste drilling fluid as claimed in claim 1, wherein the feed flow rate of the centrifuge in the step (3) is 10 m3The rotation speed is controlled at 1800-2200 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910555205.9A CN110318696B (en) | 2019-06-25 | 2019-06-25 | Harmless treatment process for water-based waste drilling fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910555205.9A CN110318696B (en) | 2019-06-25 | 2019-06-25 | Harmless treatment process for water-based waste drilling fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110318696A CN110318696A (en) | 2019-10-11 |
| CN110318696B true CN110318696B (en) | 2021-10-26 |
Family
ID=68120188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910555205.9A Active CN110318696B (en) | 2019-06-25 | 2019-06-25 | Harmless treatment process for water-based waste drilling fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110318696B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983318B (en) * | 2019-12-17 | 2023-05-26 | 中国石油天然气股份有限公司 | Treatment device and treatment method for drilling waste |
| CN111520090A (en) * | 2020-04-30 | 2020-08-11 | 中国环境科学研究院 | Treatment method and application of natural gas drilling shallow waste |
| CN111980606A (en) * | 2020-08-24 | 2020-11-24 | 大庆市翔泰石油机械设备制造有限公司 | Method for recycling drilling fluid |
| CN112661472A (en) * | 2020-12-29 | 2021-04-16 | 鄂尔多斯市固邦环保科技有限公司 | Solidification stabilizing material for water-based drill chip landfill and solidification method of water-based drill chips |
| CN113605849A (en) * | 2021-09-08 | 2021-11-05 | 成都理工大学 | Process for harmless recycling treatment of water-based drilling waste by two-step method |
| CN114057320A (en) * | 2021-10-29 | 2022-02-18 | 鄂尔多斯市昊鑫瑞源科净工程有限公司 | Waste slurry gel breaking treatment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102139971A (en) * | 2011-01-26 | 2011-08-03 | 中国石油大学(华东) | Method and process for advanced treatment of well drilling effluent |
| CN102180641A (en) * | 2011-01-26 | 2011-09-14 | 中国石油大学(华东) | Method and process for high strength curing of drilling waste |
| US9233863B2 (en) * | 2011-04-13 | 2016-01-12 | Molycorp Minerals, Llc | Rare earth removal of hydrated and hydroxyl species |
| CN108316873A (en) * | 2018-02-01 | 2018-07-24 | 中国石油天然气集团有限公司 | Water-based drilling waste harmless treatment device and method and purposes |
-
2019
- 2019-06-25 CN CN201910555205.9A patent/CN110318696B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102139971A (en) * | 2011-01-26 | 2011-08-03 | 中国石油大学(华东) | Method and process for advanced treatment of well drilling effluent |
| CN102180641A (en) * | 2011-01-26 | 2011-09-14 | 中国石油大学(华东) | Method and process for high strength curing of drilling waste |
| US9233863B2 (en) * | 2011-04-13 | 2016-01-12 | Molycorp Minerals, Llc | Rare earth removal of hydrated and hydroxyl species |
| CN108316873A (en) * | 2018-02-01 | 2018-07-24 | 中国石油天然气集团有限公司 | Water-based drilling waste harmless treatment device and method and purposes |
Non-Patent Citations (1)
| Title |
|---|
| 钻井废弃物无害化处理技术研究与应用;段晓东;《西部探矿工程》;20161231(第11期);第106-108，111页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110318696A (en) | 2019-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110318696B (en) | Harmless treatment process for water-based waste drilling fluid | |
| CN105107824B (en) | A kind of oilfield drilling discarded object method for innocent treatment | |
| CN101475290B (en) | Recovery processing process for fracturing return liquid | |
| CN102718341A (en) | Centrifugal non-landing waste drilling fluid innocent treatment technology | |
| CN108821528A (en) | A kind of micro-organism treatment process and processing system of Oilfield Oil-Contained Silt | |
| CN102320699B (en) | Method for destabilization coagulating treatment of well drilling waste liquid | |
| CN103739137A (en) | Innocent treating and recovering method and device of sump oil in oil field | |
| CN107585972A (en) | Grease processing waste water handling process and device | |
| CN101376071B (en) | Technique for separating mud and water in river and lake deposit | |
| CN102329021B (en) | High-eutrophication water advanced purification treatment method and device | |
| CN101531424A (en) | Sewage purification and reuse process and equipment thereof | |
| CN105293822B (en) | Coal chemical industry sewage disposal fundamental technology | |
| CN101053799A (en) | Preparation of demulsifying agent for processing mud and sand containing oil and its processing method | |
| CN206590995U (en) | A kind of processing unit of oil field extracted water | |
| CN103524015B (en) | A kind of mud curing agent and preparation method thereof | |
| CN104773880A (en) | Sewage treatment technology and equipment for well drilling | |
| CN112125496A (en) | Production process for dehydrating and curing sludge | |
| CN208594184U (en) | A kind of oil sludge and sand microbe treatment system | |
| CN103351065B (en) | The method of wastewater treatment of mixed type cast waste sand wet reclamation | |
| CN106396066A (en) | Water purifying agent for treatment process of polymer-containing sewage pipeline of offshore oil field and application of water purifying agent | |
| CN108328888A (en) | A method of using flyash to Treatment of Sludge | |
| CN102531117A (en) | Composite inorganic water purifying agent and preparation method thereof | |
| KR100912596B1 (en) | Ds-wt system | |
| CN201666145U (en) | Well drilling waste mud and ceramic separating unit | |
| CN105293821A (en) | Generic chemical industry sewage treatment basic process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |