CN116065985B - Harmless advanced treatment method for solid-liquid waste of water-based drilling fluid - Google Patents
Harmless advanced treatment method for solid-liquid waste of water-based drilling fluid Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000012530 fluid Substances 0.000 title claims abstract description 37
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- 238000000926 separation method Methods 0.000 claims abstract description 29
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- 230000008569 process Effects 0.000 claims abstract description 16
- 239000008394 flocculating agent Substances 0.000 claims abstract description 12
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- 239000000701 coagulant Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
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- 238000001223 reverse osmosis Methods 0.000 claims description 7
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- 239000002253 acid Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
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- 239000001509 sodium citrate Substances 0.000 claims description 5
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 5
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 5
- BYGYBSHPLSVNGL-UHFFFAOYSA-K trisodium trithiocyanate Chemical compound [Na+].[Na+].[Na+].[S-]C#N.[S-]C#N.[S-]C#N BYGYBSHPLSVNGL-UHFFFAOYSA-K 0.000 claims description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 125000000129 anionic group Chemical group 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 4
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- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
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- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000011790 ferrous sulphate Substances 0.000 description 4
- 235000003891 ferrous sulphate Nutrition 0.000 description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
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- 244000005700 microbiome Species 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
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Classifications
-
- 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
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
-
- 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
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a harmless advanced treatment method for solid-liquid wastes of water-based drilling fluid, which comprises the following steps: collecting drilling waste by adopting a non-falling while-drilling collecting process, and obtaining a first liquid phase and a first solid phase after first solid-liquid separation; the first liquid phase is subjected to oil-water separation to obtain slurry, the slurry is mixed with a gel breaker and a flocculating agent, and a second liquid phase and a second solid phase are obtained after second solid-liquid separation; the second liquid phase is treated by water to obtain wastewater reaching the standard and discharged and a third solid phase; and solidifying the first solid phase, the second solid phase and the third solid phase to obtain the standard emission solid waste. The treatment method solves the problem of innocent treatment of the solid-liquid waste of the water-based drilling fluid, realizes clean production of drilling construction, protects the environment and realizes sustainable development of oil field exploration and development.
Description
Technical Field
The invention belongs to the field of oil and gas field development, relates to an oil and gas field waste harmless treatment method, and particularly relates to a water-based drilling fluid solid-liquid waste harmless advanced treatment method.
Background
The water-based drilling fluid solid-liquid waste is a pollutant generated by using water-based drilling fluid in the petroleum drilling process, and mainly comprises waste drilling fluid, rock debris, drilling wastewater and the like. Because of the drilling process requirement, various chemical agents are needed to be added into the drilling fluid, and the drilling fluid mainly comprises components such as weighting agents, clay, chemical treatment agents, water, oil and the like, so that drilling waste contains various treatment agents, toxic substances, oils and the like, is a complex multiphase system containing mineral oil, phenolic compounds and heavy metals, has the characteristics of higher pH value of liquid phase, higher salt content, higher COD value, excessive chromaticity, excessive standard of partial heavy metal ions and the like, has higher toxicity, and is easy to pollute the ecological environment around the drilling. The oilfield drilling production generates a large amount of water-based drilling fluid solid-liquid waste every day, the direct discharge of the water-based drilling fluid solid-liquid waste can affect the nutritional environment condition and the quality of crops, and long-term accumulation can cause serious damage to surface vegetation, pollute soil and water sources and endanger the survival of human beings.
At present, the water-based drilling fluid innocent treatment method commonly used at home and abroad mainly comprises the following steps: (1) The backfilling method is mainly simple ground isolation, does not eliminate toxic substances in drilling waste, and is suitable for areas with low environmental sensitivity such as deserts, gobi and the like; (2) The solidifying method adopts physical and chemical methods to reduce the content of toxic substances in drilling waste, and is suitable for most of land environments; (3) The underground reinjection method generally uses a development well with pressure failure or a new well to carry out reinjection, has high investment cost, and is suitable for integral development of large-scale oil fields; (4) The solid-liquid separation method does not need to excavate a drilling fluid pool, carries out real-time while-drilling treatment, and circularly utilizes the liquid phase to reduce the water consumption and maintenance cost of the drilling fluid, thereby being suitable for areas with high land environmental sensitivity such as farmlands, rainforests and the like and also suitable for areas with low water; (5) The soil tillage method is to mix the waste drilling fluid with the soil according to a certain proportion, so that the salts in the waste drilling fluid are sufficiently diluted, and the organic matters are effectively degraded by microorganisms, thereby being applicable to deserts and Gobi areas with low environmental requirements. The application ranges and the advantages and disadvantages of different treatment technologies of drilling wastes are shown in table 1.
TABLE 1
Disclosure of Invention
The invention provides a harmless advanced treatment method for solid-liquid wastes of water-based drilling fluid, which solves the problem of harmless treatment of the solid-liquid wastes of the water-based drilling fluid, realizes clean production of drilling construction, protects the environment and realizes sustainable development of oil field exploration and development.
In order to achieve the technical effects, the invention adopts the following technical scheme:
the invention discloses a harmless advanced treatment method for solid-liquid waste of water-based drilling fluid, which comprises the following steps:
collecting drilling waste by adopting a non-falling while-drilling collecting process, and obtaining a first liquid phase and a first solid phase after first solid-liquid separation;
the first liquid phase is subjected to oil-water separation to obtain slurry, the slurry is mixed with a gel breaker and a flocculating agent, and a second liquid phase and a second solid phase are obtained after second solid-liquid separation;
the second liquid phase is treated by water to obtain wastewater reaching the standard and discharged and a third solid phase;
and solidifying the first solid phase, the second solid phase and the third solid phase to obtain the standard emission solid waste.
In the invention, the treatment method starts from four aspects of non-floor receiving of drilling waste, liquid removal, decrement solid-liquid separation control, sewage deep water treatment and waste solid solidification technology, realizes harmless control of the water-based drilling liquid solid-liquid waste in the early, middle and later stages, better solves the problem of pollution of the water-based drilling liquid solid-liquid waste in drilling construction, realizes clean production of drilling, and has good environmental benefit and social benefit.
As a preferable technical scheme of the invention, the non-falling while-drilling collecting process comprises the following steps:
collecting drilling waste by using a rock debris receiving device and a transverse rock debris spiral conveying device;
and the drilling waste enters a receiving device for buffering, and is cleaned and stood in sequence to obtain pretreated rock fragments.
According to the invention, the non-floor receiving and transmitting technology is mainly used for receiving and collecting rock scraps and mud returned by a vibrating screen of a drilling solid control system, separating the rock scraps by a sand and mud remover, throwing the rock scraps by a centrifugal machine, and then conveying the rock scraps to a drying vibrating screen on a three-phase separation unit for primary solid-liquid separation.
As a preferable technical scheme of the invention, the rock debris receiving device is used for receiving rock debris and slurry returned by the vibrating screen.
Preferably, the transverse rock debris spiral conveying device is used for collecting rock debris thrown out by a centrifugal machine and separating out the rock debris by a sand and mud removing device and sending the rock debris into the rock debris receiving device.
Preferably, a heavy metal ion stabilizer is added to the washing.
Preferably, the upper oil phase is separated and removed after standing.
In a preferred technical scheme of the invention, the first solid-liquid separation method is dry vibration screening.
As a preferable technical scheme of the invention, the slurry is returned to the drilling operation for recycling, and the slurry with the recycling amount exceeding the recycling amount is mixed with the gel breaker and the flocculant.
Preferably, the breaker comprises any one or a combination of at least two of an aluminum-based coagulant, an iron-based coagulant, or a polysilicic acid coagulant, typical but non-limiting examples of which are: a combination of an aluminum-based coagulant and an iron-based coagulant, a combination of an iron-based coagulant and a polysilicic acid coagulant, a combination of a polysilicic acid coagulant and an aluminum-based coagulant, or a combination of an aluminum-based coagulant, an iron-based coagulant and a polysilicic acid coagulant.
In the present invention, the breaker may be any one or a combination of at least two of aluminum sulfate, ferrous sulfate, or polyaluminosilicate, typical but non-limiting examples of which are: a combination of aluminum sulfate and ferrous sulfate, a combination of ferrous sulfate and polyaluminosilicate, a combination of polyaluminosilicate and aluminum sulfate, or a combination of aluminum sulfate, ferrous sulfate and polyaluminosilicate, and the like.
Preferably, the flocculant comprises any one or a combination of at least two of anionic, cationic or amphoteric organic polymeric flocculants, typical but non-limiting examples of which are: a combination of anions and cations, a combination of cations and amphoterics, a combination of amphoterics and anions, or a combination of anions, cations and amphoterics, etc.
In the present invention, the flocculant may be an anionic, cationic or nonionic polyacrylamide.
Preferably, the second solid-liquid separation method comprises centrifugation.
In the invention, the addition amounts of the breaker and the flocculant can be determined and adjusted according to the specific properties of the slurry, and are not particularly limited herein.
In the invention, the solid-liquid separation and liquid removal deweighting technology of the drilling waste liquid adopts a gel breaker to break the gel connection structure of the drilling liquid through electric neutralization reaction, and then uses a flocculating agent to flocculate solid particles and organic matters in the well drilling liquid after gel breaking, so as to separate the water solution from the well drilling liquid. Finally, solid phase particles with large particle size are separated from water by adopting a centrifugal machine, so that the purpose of solid-liquid separation is achieved.
As a preferable technical scheme of the invention, the water treatment comprises air floatation treatment, coagulation treatment, electrochemical oxidation treatment, reverse osmosis treatment, deep oxidation treatment and activated carbon adsorption treatment which are sequentially carried out.
Preferably, the advanced oxidation treatment is an ozone oxidation treatment.
As a preferable technical scheme of the invention, the COD of the wastewater after water treatment is less than or equal to 100mg/L, the BOD is less than or equal to 20mg/L, the oil content is less than or equal to 5mg/L, the pH value is 6-9, and the suspended matters are less than or equal to 70mg/L.
In the invention, the advanced water treatment technology adopts the processes of air floatation degreasing, plate-and-frame filter pressing and electrochemical oxidation, and is matched with reverse osmosis membrane filtration and ozone oxidation for advanced treatment, so that the sewage reaches the discharge standard. Particularly, for sewage with higher chloride ion concentration, most of chloride ions in the sewage can be removed by adopting the process, and the discharge standard is reached.
According to the invention, the sewage after water treatment is subjected to detection on various index values of produced water according to a test method specified in the national integrated wastewater discharge standard, and is discharged at a specified discharge port of an environmental protection department after reaching the discharge standard, otherwise, the sewage returns to an upper-level process for cyclic treatment.
In a preferred embodiment of the present invention, the method for curing includes adding a curing agent, a drying agent, and a stabilizer to the solid phase obtained by mixing the first solid phase, the second solid phase, and the third solid phase, and stirring the mixture.
As a preferred embodiment of the present invention, the curing agent comprises any one or a combination of at least two of lime, fly ash or cement, typical but non-limiting examples of which are: a combination of lime and fly ash, a combination of fly ash and cement, a combination of cement and lime or a combination of lime, fly ash and cement, etc.
Preferably, the drying agent comprises a coagulation material such as polymeric ferric sulfate and/or polymeric aluminum chloride.
Preferably, the stabilizer comprises any one or a combination of at least two of sodium citrate, trisodium thiocyanate or tetrasodium ethylenediamine tetraacetate, typical but non-limiting examples of such combinations are: a combination of sodium citrate and trisodium thiocyanate, a combination of trisodium thiocyanate and tetrasodium ethylenediamine tetraacetate, a combination of tetrasodium ethylenediamine tetraacetate and sodium citrate, or a combination of sodium citrate, trisodium thiocyanate and tetrasodium ethylenediamine tetraacetate, and the like.
In the present invention, the amounts of the curing agent, the drying agent and the stabilizer to be added may be determined according to the properties of the first solid phase, the second solid phase and the third solid phase, and are not particularly limited herein.
In the invention, the solidification method is to add a certain amount of solidification/stabilization treatment agent into the solid waste of drilling so that the physical property and chemical property of the solid waste tend to be stabilized, and the solid waste is converted into solid with high cementing strength, or is landfilled or used as building materials and the like. The method is now considered to be a relatively reliable good method of remediating drilling fluid cuttings and waste solids contamination. The method is most effective for COD, cr, pH value with the greatest treatment difficulty and total chromium.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) According to the harmless advanced treatment method for the solid-liquid waste of the water-based drilling fluid, disclosed by the invention, through the receiving system and the storage equipment of the drilling cuttings and the waste drilling fluid, the non-floor treatment of the drilling fluid waste can be realized, a treatment mode of directly discharging the lagged drilling fluid waste to a mud pit is replaced, the contact between the drilling fluid waste and the natural environment is effectively isolated, the 0 discharge of the waste on a drilling site is realized, and the clean production requirement of drilling is met;
(2) Compared with other waste treatment methods, the harmless advanced treatment method of the water-based drilling fluid solid-liquid waste provided by the invention has the advantages that the process control of waste treatment is emphasized, the solid-liquid separation of the drilling waste is realized through the liquid removal and decrement treatment of the waste, the final discharge volume of the waste can be reduced by more than 50%, and the pollution degree to the environment and the transportation cost of the waste are greatly reduced;
(3) The harmless advanced treatment method of the water-based drilling fluid solid-liquid waste provided by the invention is used for carrying out advanced water treatment on the drilling wastewater by chemical and physical methods, and the treated produced water meets the first-level standard of national integrated wastewater discharge standard, can be directly used for preparing drilling and completion fluid and cleaning equipment, and realizes the recycling of water resources or reaches the standard of discharging;
(4) The harmless advanced treatment method for the solid-liquid waste of the water-based drilling fluid utilizes the optimized curing agent and curing equipment to cure the waste, can effectively fix harmful substances of the waste, realizes isolation from natural environment, and can realize natural degradation by repeated tillage of the cured product after treatment or change waste into valuable in oilfield road construction.
Drawings
Fig. 1 is a schematic flow chart of the harmless advanced treatment method for the solid-liquid waste of the water-based drilling fluid provided in embodiment 1 of the invention.
The present invention will be described in further detail below. The following examples are merely illustrative of the present invention and are not intended to represent or limit the scope of the invention as defined in the claims.
Detailed Description
For a better illustration of the present invention, which is convenient for understanding the technical solution of the present invention, exemplary but non-limiting examples of the present invention are as follows:
example 1
The embodiment provides a harmless advanced treatment method for solid-liquid waste of water-based drilling fluid, which comprises the following steps:
(1) Collecting drilling waste by adopting a non-falling while-drilling collecting process, and obtaining a first liquid phase and a first solid phase after first solid-liquid separation;
the specific flow is as follows:
1.1, directly entering rock scraps returned by a vibrating screen and mud into a rock scraps receiver, receiving the rock scraps thrown out by a centrifugal machine by a transverse rock scraps spiral conveyor, separating the rock scraps by a sand and mud remover, and sending the rock scraps to the rock scraps receiver;
1.2, buffering the received rock scraps (slurry) in a receiver, well cleaning the rock scraps through a cleaning port, adding a heavy metal ion stabilizer into the cleaning fluid to stabilize the rock scraps and heavy metal ions in the returned slurry, sinking the rock scraps into the bottom of a tank after cleaning, gradually floating an oil phase on the surface of the rock scraps, overflowing the oil phase to an oil storage tank through an overflow port, and carrying out primary separation on the oil phase;
1.3, pushing the bottom rock scraps to a rock scraps output screw propeller through a bottom screw propeller to push the rock scraps to a drying vibrating screen in a next unit for preliminary solid-liquid separation. The liquid phase in the receiver may be evacuated by a bottom evacuation port.
(2) The first liquid phase is subjected to oil-water separation to obtain slurry, the slurry is mixed with a gel breaker and a flocculating agent, and a second liquid phase and a second solid phase are obtained after second solid-liquid separation;
the specific flow is as follows:
2.1, receiving the transmitted rock scraps from the upper stage without falling to the ground, and enabling the rock scraps to enter a drying vibrating screen for preliminary solid-liquid separation treatment;
2.2, conveying the solid phase from the drying vibrating screen to a conveyor in the three-phase separation unit, and conveying the solid phase to a curing unit for curing;
2.3, the liquid from the drying vibrating screen enters a liquid buffer separation tank below the vibrating screen, oil in the tank slowly floats to the surface and is injected into an oil storage tank for accumulation, and when a certain amount of oil reaches, the oil is pumped into the oil storage tank for storage, and mud at the bottom layer can be returned to drilling operation for recycling;
2.4, when the fluid cannot be recycled, the fluid enters a gel breaking tank, the physical and chemical properties of the drilling fluid are changed by adding a gel breaker and a flocculating agent to damage a colloid system, suspended fine particles are promoted to be coalesced into larger floccules, and the larger floccules are pumped into a centrifugal machine to carry out centrifugal solid-liquid separation;
and 2.5, discharging the solid phase from the centrifugal machine, conveying the solid phase into a conveyor, conveying the solid phase to a curing unit for curing, conveying the liquid into a buffer tank for storage, and pumping the liquid into a next unit for deep water treatment after a certain amount of liquid is reached.
(3) The second liquid phase is treated by water to obtain wastewater reaching the standard and discharged and a third solid phase;
the specific flow is as follows:
pumping wastewater in upstream equipment into an air floatation device for preliminary degreasing and deslagging treatment, filtering out particles with larger particle size and petroleum which can float on the surface of the wastewater, scraping scum by air floatation, entering a scum area, pumping back to a liquid removal and reduction unit for retreating, and storing the air-floated wastewater in a clear water tank of a water tank;
3.2, pumping a gel breaker and a flocculating agent into a clear water tank through a metering pump to carry out secondary coagulation treatment on the wastewater, conveying the treated solid-liquid mixture into a plate-and-frame filter press through a high-pressure screw pump, automatically press-filtering to form mud cakes, intensively collecting the generated mud cakes, conveying the mud cakes to a curing unit to be cured, and pumping the filtrate into electrochemical oxidation equipment;
3.3, adding a pH value regulator into electrochemical oxidation equipment to make the wastewater weak acidic, wherein iron and carbon in the equipment form a large number of micro primary cells, and the COD of the wastewater can be effectively reduced through oxidation-reduction reaction. And adding a pH regulator and a flocculating agent, regulating the pH value of the wastewater to be neutral, and further removing micro flocs in the wastewater through a solid-liquid separator of a spiral shell stacking machine in the equipment.
3.4, pumping the effluent from the electrochemical oxidation treatment into a reverse osmosis membrane treatment device by using a high-pressure pump, wherein the device can finish reverse osmosis treatment on sewage under the pressure of 70Bar, and can effectively filter out organic matters and soluble salts in the sewage.
And 3.5, pumping the produced water treated by the reverse osmosis membrane into advanced oxidation treatment equipment, wherein the equipment has the function of manufacturing ozone, and carrying out advanced oxidation treatment on the water by utilizing the strong oxidizing property of the ozone, so as to further reduce COD in the water, and finally, reducing the chromaticity of the water by the adsorption effect of the activated carbon.
And 3.6, detecting various index values of the produced water according to a test method specified in the national integrated wastewater discharge standard, and discharging at a specified discharge port of an environmental protection department after the index values reach the discharge standard, otherwise, returning to a superior process for circulating treatment.
The COD value of the sewage after the water treatment is reduced to 100mg/L, the BOD is less than or equal to 20mg/L, the oil content is less than or equal to 5mg/L, the pH value is 6-9, and the suspended matters are less than or equal to 70mg/L.
(4) The first solid phase, the second solid phase and the third solid phase are solidified to obtain standard emission solid waste;
the specific flow is as follows:
4.1, adding corresponding treating agents into storage bins of curing agents, drying agents and stabilizing agents, setting the adding proportion, and enabling the curing units to fully operate;
4.2, the drilling solid waste conveyed from the drilling waste liquid removing and reducing unit and the deep water treatment unit enters a solid waste receiving bin for buffer storage, and a double-screw propeller at the bottom of the bin is started to push materials into a mixing system after a certain amount of drilling solid waste is reached;
and 4.3, simultaneously adding the curing agent and the drying agent into the mixing system according to a proportion, automatically starting the mixing system to uniformly stir after the feeding is finished, and conveying the mixture to a cured product receiving device from the bottom of the mixture to an automatic material conveying system after the set time is reached.
The applicant states that the detailed structural features of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (9)
1. The harmless advanced treatment method for the solid-liquid waste of the water-based drilling fluid is characterized by comprising the following steps of:
collecting drilling waste by adopting a non-falling while-drilling collecting process, and obtaining a first liquid phase and a first solid phase after first solid-liquid separation; the non-falling while-drilling collection process comprises the following steps of: collecting drilling waste by using a rock debris receiving device and a transverse rock debris spiral conveying device, buffering the drilling waste in the receiving device, sequentially cleaning and standing, adding a heavy metal ion stabilizer in the cleaning, and separating and removing an upper oil phase after standing to obtain pretreated rock debris;
the first liquid phase is subjected to oil-water separation to obtain slurry, the slurry is returned to drilling operation for recycling, the slurry with the recycling amount exceeding the recycling amount is mixed with a gel breaker and a flocculating agent, and a second liquid phase and a second solid phase are obtained after second solid-liquid separation; the gel breaker comprises any one or a combination of at least two of an aluminum-based coagulant, an iron-based coagulant or a polysilicic acid coagulant; the flocculant comprises any one or a combination of at least two of anionic, cationic or amphoteric organic polymer flocculants;
after the second liquid phase is subjected to water treatment, the water treatment comprises air floatation treatment, coagulation treatment, electrochemical oxidation treatment, reverse osmosis treatment, ozone oxidation treatment and activated carbon adsorption treatment in sequence, so as to obtain wastewater reaching the standard and discharge and a third solid phase; COD of the wastewater after water treatment is less than or equal to 100mg/L, BOD is less than or equal to 20mg/L, oil content is less than or equal to 5mg/L, pH value is 6-9, and suspended matters are less than or equal to 70mg/L;
and adding a curing agent, a drying agent and a stabilizing agent into the solid phase obtained by mixing the first solid phase, the second solid phase and the third solid phase, and stirring to obtain the standard-reaching solid waste.
2. A method of treating according to claim 1, wherein the cuttings receiving apparatus is adapted to receive shaker return cuttings and mud.
3. A treatment method according to claim 1, wherein the lateral cuttings screw conveyor is adapted to collect cuttings thrown away by a centrifuge and separated from cuttings by a desanding and desliming device and fed to the cuttings receiving apparatus.
4. The process of claim 1 wherein the first solid-liquid separation process is dry vibratory screening.
5. The process of claim 1, wherein the second solid-liquid separation method comprises centrifugation.
6. The method of treatment of claim 1, wherein the curing agent comprises any one or a combination of at least two of lime, fly ash, or cement.
7. The method of claim 1, wherein the drying agent comprises polymeric ferric sulfate and/or polymeric aluminum chloride aggregate.
8. The method of claim 1, wherein the stabilizer comprises any one or a combination of at least two of sodium citrate, trisodium thiocyanate, or tetrasodium ethylenediamine tetraacetate.
9. A method of treatment according to claim 1, characterized in that the method of treatment comprises the steps of:
collecting drilling waste by adopting a non-falling while-drilling collecting process, and obtaining a first liquid phase and a first solid phase after drying, vibrating and screening;
the non-falling while-drilling collection process comprises the following steps of: collecting drilling waste by using a rock debris receiving device and a transverse rock debris spiral conveying device, buffering the drilling waste in the receiving device, sequentially cleaning and standing, adding a heavy metal ion stabilizer in the cleaning, and separating and removing an upper oil phase after standing to obtain pretreated rock debris;
the rock debris receiving device is used for receiving rock debris and slurry returned by the vibrating screen, and the transverse rock debris spiral conveying device is used for collecting the rock debris thrown out by the centrifugal machine, separating the rock debris by the sand and mud removal device and conveying the rock debris into the rock debris receiving device;
the first liquid phase is subjected to oil-water separation to obtain slurry, the slurry is returned to drilling operation for recycling, the slurry with the recycling amount exceeding the recycling amount is mixed with a gel breaker and a flocculating agent, and a second liquid phase and a second solid phase are obtained after centrifugal separation; the gel breaker comprises any one or a combination of at least two of an aluminum-based coagulant, an iron-based coagulant or a polysilicic acid coagulant; the flocculant comprises any one or a combination of at least two of anionic, cationic or amphoteric organic polymer flocculants;
after the second liquid phase is subjected to water treatment, the water treatment comprises air floatation treatment, coagulation treatment, electrochemical oxidation treatment, reverse osmosis treatment, ozone oxidation treatment and activated carbon adsorption treatment in sequence, so as to obtain wastewater reaching the standard and discharge and a third solid phase; COD of the wastewater after water treatment is less than or equal to 100mg/L, BOD is less than or equal to 20mg/L, oil content is less than or equal to 5mg/L, pH value is 6-9, and suspended matters are less than or equal to 70mg/L;
and adding a curing agent, a drying agent and a stabilizing agent into the solid phase obtained by mixing the first solid phase, the second solid phase and the third solid phase, and stirring to obtain the standard-reaching solid waste.
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