CN112759216A - Method and system for reducing, harmlessly and resourcefully treating waste drilling mud - Google Patents
Method and system for reducing, harmlessly and resourcefully treating waste drilling mud Download PDFInfo
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- CN112759216A CN112759216A CN202011497154.8A CN202011497154A CN112759216A CN 112759216 A CN112759216 A CN 112759216A CN 202011497154 A CN202011497154 A CN 202011497154A CN 112759216 A CN112759216 A CN 112759216A
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- 239000002699 waste material Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 79
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000000926 separation method Methods 0.000 claims abstract description 53
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- 238000006277 sulfonation reaction Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007791 liquid phase Substances 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 11
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- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 7
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- 235000011128 aluminium sulphate Nutrition 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
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- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 3
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
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Images
Classifications
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- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a method and a system for reducing, harmlessly and resourcefully treating waste drilling mud, relates to the technical field of petroleum and natural gas waste treatment, and solves the technical problem of environmental pollution caused by non-ideal treatment effect of the waste drilling mud. The method and the system for the reduction, harmless and resource treatment of the drilling waste mud comprise the following steps: firstly, collecting slurry; secondly, solid-liquid separation; thirdly, adding water into the separated solid phase discharge of the sulfonation system to fluidize and homogenize the solid phase discharge; fourthly, gel breaking and flocculation; fifthly, solid-liquid separation; and sixthly, treating the liquid phase by an iron-carbon micro-electrolysis and Fenton oxidation water treatment device. The invention is used for providing a method for reducing, harmlessly and resourcefully treating waste drilling mud, which can effectively treat the waste drilling mud.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas waste treatment, in particular to a method and a system for reducing, harmlessly and resourcefully treating waste drilling mud.
Background
The drilling mud has the functions of suspending rock debris, balancing formation pressure, transmitting hydrodynamic force, breaking rock, cooling a drilling tool and the like in the process of drilling, and is known as blood for drilling in an oil field.
As drilling progresses, the depth of the well increases and the performance requirements of the drilling mud also increase, so that various chemicals, typically containing heavy metals, oils, bases and other compounds, need to be added to the mud to meet the drilling requirements. In the mud circulation process, waste residues and waste slurry need to be continuously discharged, and the mud is completely discharged after drilling is completed to become the waste slurry. Due to the characteristics of field operation of petroleum drilling, all wastes in a construction site are almost completely discharged and accumulated in a waste slurry storage pit, and finally, a multiphase stable colloid suspension mixture consisting of clay, a weighting material, various chemical treatment agents, associated sewage, oil water, drill cuttings and the like is formed.
The waste drilling mud has excellent fluidity, so that the pollution of the waste drilling mud has the characteristics of large pollution area and wide area; too high pH value of the slurry, high concentration of soluble salt and petroleum influence the structure of the soil and harm the growth of plants; heavy metal ions in the slurry are not easily degraded by passive plants and are finally enriched in a human body through a food chain, so that the health and safety of human are harmed; the COD, BOD and oil content of the slurry are high, and the normal growth of aquatic organisms can be influenced after the slurry enters a water body.
With the enhancement of environmental awareness of people, people pay more attention to the harm of the drilling waste mud, and the current processes for treating the drilling waste mud mainly comprise a chemical solidification method, an MTC conversion technology, a land farming method, drying and burning treatment, biological treatment, and a pit landfill or reinjection method.
The chemical solidification method is to inject the waste slurry into a large pit, add a curing agent, fully stir, and bury the slurry with natural soil after curing, and the method cannot remove harmful substances in the slurry essentially, and can cause secondary pollution through the scouring of rainwater or underground water, and the treatment period is long, so that the method is easily influenced by geographical conditions, climate conditions and the like, and the treatment effect is difficult to control.
The MTC conversion technology is a technological means of adding additives into waste mud to convert the waste mud into cement paste, and the method has extremely high technical requirements and can be applied to only a few countries at present.
The land cultivation method is that after the drilling mud loses the upper clear water, the drilling mud is scattered on the cultivated land, and the harmful substances in the drilling mud are decomposed and absorbed by using microorganisms and green plants in the soil, so that the pollutants in the drilling waste mud lose the pollution capacity by using the weathering effect. The treatment technology has high requirements on soil performance, microbial performance and vegetation growth, and the treatment process has extremely high requirements, otherwise, large-area pollution is easily caused.
The dry incineration treatment is a means for drying and incinerating the drilling waste mud. The method is only suitable for waste slurry with high oil content, the treatment cost is high, and the secondary pollution to the environment is caused by waste gas and dust generated in the combustion process.
The biodegradation technology is a technology for biodegrading pollutants in drilling fluid by using one or more microorganisms. The technology has the problems of high cost, difficult control of process conditions and the like.
Harmful substances in the slurry are not treated in the landfill or reinjection, so that the environment or stratum is easily polluted.
The applicant has found that the prior art has at least the following technical problems: the existing drilling waste mud has unsatisfactory treatment effect, and causes environmental pollution.
Disclosure of Invention
The invention aims to provide a method and a system for reducing, harmlessly and resourcefully treating waste drilling mud, which aim to solve the technical problem of environmental pollution caused by unsatisfactory treatment effect of the waste drilling mud in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for reducing, harmlessly and resourcefully treating waste drilling mud, which comprises the following steps:
(1) collecting the discharged drilling waste mud of the well team solid control equipment to a mud collecting tank;
(2) carrying out solid-liquid separation on the collected slurry, further recycling the liquid-phase slurry after the solid-liquid separation, and further treating solid-phase discharged substances;
(3) wherein, after solid-liquid separation of the non-sulfonated mud generated in the early stage of drilling, the generated solid phase waste of the polymer system is output to a mud cake stacking area, and after solid-liquid separation of the sulfonated mud generated in the later stage of drilling, the generated solid phase waste of the sulfonated system is output to a low-level collecting tank;
(4) adding water into the solid phase discharged substance of the sulfonation system, stirring to fluidize and homogenize the substance, so that the solid content of the substance is 20-30%;
(5) adjusting the pH value of the homogenized solid phase discharge of the sulfonation system to 6-9 by using a pH regulator;
(6) adding an oxidant into the slurry after pH adjustment for oxidation;
(7) adding a flocculating agent and a coagulant aid solution into the oxidized slurry, carrying out gel breaking and flocculation on the slurry, and then carrying out solid-liquid separation;
(8) and treating the separated liquid by an iron-carbon micro-electrolysis and Fenton oxidation water treatment device.
Further, the oxidant comprises one or more of hydrogen peroxide, sulfamic acid, chlor-alkali and the like.
Further, the flocculant comprises an inorganic flocculant: one or more of ferrous sulfate, ferrous chloride, alum, polyaluminium chloride, basic aluminium chloride, aluminium sulfate and calcium chloride, and an organic flocculant: one or more of sodium polyacrylate, polyacrylamide, polystyrene sulfonate and polyethylene oxide.
Further, the concentration of the flocculant is 20-30 wt%, the concentration of the coagulant aid solution is 0.1-0.2 wt%, the addition amount of the flocculant is 10-15% of the volume of the slurry, and the addition amount of the coagulant aid solution is 15-20 ppm of the volume of the slurry.
Further, the addition amount of the oxidant is 0.3-0.8% of the volume of the slurry.
A well drilling waste mud minimizing harmless resource processing system includes:
the mud collecting tank is used for collecting waste drilling mud discharged by the solid control equipment of the drilling team;
the high-level buffer tank is used for conveying the slurry in the slurry collecting tank to the high-level buffer tank through a sand pump;
the first solid-liquid separation device is used for carrying out solid-liquid separation on the slurry in the high-level collection tank;
the temporary storage tank is used for allowing the liquid-phase slurry separated by the first solid-liquid separation device to enter;
the polymer system solid phase discharged materials after being separated by the first solid-liquid separation device are conveyed to a mud cake stacking area through the first auger;
the solid phase discharged material of the sulfonation system separated by the first solid-liquid separation device flows into the low-level collection tank; adding water into the low-level collection tank and stirring to fluidize and homogenize the slurry in the low-level collection tank; then, performing gel breaking and flocculation on the slurry;
the second solid-liquid separation device is used for carrying out solid-liquid separation on the slurry flowing out of the low-level collection tank;
and the liquid-phase slurry separated by the second solid-liquid separation device enters the filtrate tank.
Further, the low-level collection tank is divided into a first compartment and a second compartment, the first compartment receives the polymer system solid phase waste, the second compartment receives the sulfonation system solid phase waste, and the first auger is connected to the second compartment.
Further, the first solid-liquid separation device is a high-frequency drying machine.
Further, the second solid-liquid separation device is a plate-and-frame filter press.
Further, the mud in the filtrate tank is conveyed to a conical tank of a drilling team through a mud pump.
The invention has the beneficial effects that: the invention provides a method for treating waste drilling mud in a reducing and harmless and recycling manner. The solid phase of a polymer system in the solid-phase slurry is conveyed to a slurry cake stacking area, and the solid phase of a sulfonation system is conveyed to a low-level collection tank for further harmless treatment, so that the harmful ingredients in the waste sulfonation slurry can be effectively reduced, and the effect is remarkable. After the waste sulfonated mud is treated, the obtained solid phase can be used for well site recovery, paving, brick making and the like, and the liquid phase can be used for recycling and slurry preparation for a drilling crew after being treated by an iron-carbon micro-electrolysis and Fenton oxidation method, so that resources can be recovered to the maximum extent, and the harm of the waste drilling mud to the environment is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of the present invention (two).
Detailed Description
The content of the present invention and the points of distinction between the present invention and the prior art can be understood with reference to the accompanying drawings, fig. 1-2, and the text. The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings, in which some alternative embodiments of the invention are shown. It should be noted that: any technical features and any technical solutions in the present embodiment are one or more of various optional technical features or optional technical solutions, and for the sake of brevity, this document cannot exhaustively enumerate all the alternative technical features and alternative technical solutions of the present invention, and is also not convenient for each embodiment of the technical features to emphasize it as one of various optional embodiments, so those skilled in the art should know that: any technical means provided by the invention can be replaced or any two or more technical means or technical characteristics provided by the invention can be combined with each other to obtain a new technical scheme. Any technical features and any technical solutions in the present embodiment do not limit the scope of the present invention, and the scope of the present invention should include any alternative technical solutions that can be conceived by those skilled in the art without inventive efforts and new technical solutions that can be obtained by those skilled in the art by combining any two or more technical means or technical features provided by the present invention with each other.
In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The invention provides a method and a system for reducing, harmlessly and resourcefully treating waste drilling mud, which can effectively treat the waste drilling mud.
The technical solution provided by the present invention is explained in more detail below with reference to fig. 1-2.
The invention provides a method for reducing, harmlessly and resourcefully treating waste drilling mud, which comprises the following steps:
(1) collecting the discharged drilling waste mud of the well team solid control equipment to a mud collecting tank;
(2) carrying out solid-liquid separation on the collected slurry, further recycling the liquid-phase slurry after the solid-liquid separation, and further treating solid-phase discharged substances;
(3) wherein, after solid-liquid separation of the non-sulfonated mud generated in the early stage of drilling, the generated solid phase waste of the polymer system is output to a mud cake stacking area, and after solid-liquid separation of the sulfonated mud generated in the later stage of drilling, the generated solid phase waste of the sulfonated system is output to a low-level collecting tank;
(4) adding water into the solid phase discharged substance of the sulfonation system, stirring to fluidize and homogenize the substance, so that the solid content of the substance is 20-30%;
(5) adjusting the pH value of the homogenized solid phase discharge of the sulfonation system to 6-9 by using a pH regulator;
(6) adding an oxidant into the slurry after pH adjustment for oxidation;
(7) adding a flocculating agent and a coagulant aid solution into the oxidized slurry, carrying out gel breaking and flocculation on the slurry, and then carrying out solid-liquid separation;
(8) and treating the separated liquid by an iron-carbon micro-electrolysis and Fenton oxidation water treatment device.
The invention provides a method for treating waste drilling mud in a reducing and harmless and recycling manner. The solid phase of a polymer system in the solid-phase slurry is conveyed to a slurry cake stacking area, and the solid phase of a sulfonation system is conveyed to a low-level collection tank for further harmless treatment, so that the harmful ingredients in the waste sulfonation slurry can be effectively reduced, and the effect is remarkable. After the waste sulfonated mud is treated, the obtained solid phase can be used for well site recovery, paving, brick making and the like, and the liquid phase can be used for recycling and slurry preparation for a drilling crew after being treated by an iron-carbon micro-electrolysis and Fenton oxidation method, so that resources can be recovered to the maximum extent, and the harm of the waste drilling mud to the environment is solved.
As an alternative embodiment, the oxidant includes one or more of hydrogen peroxide, sulfamic acid, chlor-alkali, and the like.
As an alternative embodiment, the flocculant comprises an inorganic flocculant: one or more of ferrous sulfate, ferrous chloride, alum, polyaluminium chloride, basic aluminium chloride, aluminium sulfate and calcium chloride, and an organic flocculant: one or more of sodium polyacrylate, polyacrylamide, polystyrene sulfonate and polyethylene oxide.
In an alternative embodiment, the flocculant is at a concentration of 20 wt% to 30 wt%, the coagulant aid solution is at a concentration of 0.1 wt% to 0.2 wt%, the flocculant is added in an amount of 10% to 15% by volume of the slurry, and the coagulant aid solution is added in an amount of 15ppm to 20ppm by volume of the slurry.
In an alternative embodiment, the oxidant is added in an amount of 0.3% to 0.8% by volume of the slurry.
A well drilling waste mud minimizing harmless resource processing system includes:
the mud collecting tank is used for collecting waste drilling mud discharged by the solid control equipment of the drilling team;
the high-level buffer tank is used for conveying the slurry in the slurry collecting tank to the high-level buffer tank through a sand pump;
the first solid-liquid separation device is used for carrying out solid-liquid separation on the slurry in the high-level collection tank;
the temporary storage tank is used for allowing the liquid-phase slurry separated by the first solid-liquid separation device to enter;
the polymer system solid phase discharged materials after being separated by the first solid-liquid separation device are conveyed to a mud cake stacking area through the first auger;
the solid phase discharged material of the sulfonation system separated by the first solid-liquid separation device flows into the low-level collection tank; adding water into the low-level collection tank and stirring to fluidize and homogenize the slurry in the low-level collection tank; then, performing gel breaking and flocculation on the slurry;
the second solid-liquid separation device is used for carrying out solid-liquid separation on the slurry flowing out of the low-level collection tank;
and the liquid-phase slurry separated by the second solid-liquid separation device enters the filtrate tank.
As an alternative embodiment, the low-level collection tank is divided into a first compartment and a second compartment, the first compartment receives the polymer system solid phase effluent, the second compartment receives the sulfonated system solid phase effluent, and the first auger is connected to the second compartment.
In an alternative embodiment, the first solid-liquid separation device is a high frequency dryer.
As an alternative embodiment, the second solid-liquid separation device is a plate and frame filter press.
In an alternative embodiment, the mud in the filtrate tank is delivered to a drilling crew conical tank by a mud pump.
Example 1:
the invention provides a method for reducing, harmlessly and resourcefully treating waste drilling mud, which comprises the following steps:
(1) collecting the discharged drilling waste mud of the well team solid control equipment to a mud collecting tank;
(2) carrying out solid-liquid separation on the collected slurry, further recycling the liquid-phase slurry after the solid-liquid separation, and further treating solid-phase discharged substances;
(3) wherein, after solid-liquid separation of the non-sulfonated mud generated in the early stage of drilling, the generated solid phase waste of the polymer system is output to a mud cake stacking area, and after solid-liquid separation of the sulfonated mud generated in the later stage of drilling, the generated solid phase waste of the sulfonated system is output to a low-level collecting tank;
(4) adding water into the solid phase discharged substance of the sulfonation system, stirring to fluidize and homogenize the substance, so that the solid content of the substance is 20%;
(5) adjusting the pH value of the homogenized solid phase discharge of the sulfonation system to 7 by using dilute hydrochloric acid;
(6) adding hydrogen peroxide into the slurry after pH adjustment for oxidation; the adding amount of the hydrogen peroxide is 0.4 percent of the volume of the slurry; the reaction time is 2 hours, and stirring is carried out simultaneously;
(7) adding ferrous sulfate and polystyrene sulfonate into the oxidized slurry, wherein the concentration of the ferrous sulfate is 25 wt%, the concentration of the polystyrene sulfonate is 0.1 wt%, the addition amount of the ferrous sulfate is 10% of the volume of the slurry, the addition amount of the polystyrene sulfonate is 20ppm of the volume of the slurry, and stirring for 15 minutes; performing gel breaking flocculation on the slurry, and then performing solid-liquid separation;
(8) the separated liquid is treated by an iron-carbon micro-electrolysis and Fenton oxidation water treatment device, and the treated liquid phase reaches the standard and is used for well group slurry preparation and recycling.
Example 2:
the present embodiment 2 is different from embodiment 1 in that: the values of some parameters are different from the selected chemical substances, and the differences specifically include: adjusting the pH value of the homogenized solid phase discharge of the sulfonation system to 9 by using dilute hydrochloric acid; the adding amount of the hydrogen peroxide is 0.5 percent of the volume of the slurry, the reaction time is 2.5 hours, and the stirring is carried out simultaneously; the concentration of the ferrous sulfate is 28 wt%, the concentration of the polystyrene sulfonate is 0.15 wt%, the addition amount of the ferrous sulfate is 12% of the volume of the slurry, and the addition amount of the polystyrene sulfonate is 18ppm of the volume of the slurry.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for reducing, harmlessly and resourcefully treating waste drilling mud is characterized by comprising the following steps:
(1) collecting the discharged drilling waste mud of the well team solid control equipment to a mud collecting tank;
(2) the first solid-liquid separation device is used for carrying out solid-liquid separation on the collected slurry, the liquid-phase slurry after the solid-liquid separation enters the temporary storage tank, the liquid-phase slurry is further recycled through recovery, and solid-phase discharged substances are further treated;
(3) wherein, after solid-liquid separation of the non-sulfonated mud generated in the early stage of drilling, the generated solid phase waste of the polymer system is output to a mud cake stacking area, and after solid-liquid separation of the sulfonated mud generated in the later stage of drilling, the generated solid phase waste of the sulfonated system is output to a low-level collecting tank;
(4) adding water into the solid phase discharged substance of the sulfonation system, stirring to fluidize and homogenize the substance, so that the solid content of the substance is 20-30%;
(5) adjusting the pH value of the homogenized solid phase discharge of the sulfonation system to 6-9 by using a pH regulator;
(6) adding an oxidant into the slurry after pH adjustment for oxidation;
(7) adding a flocculating agent and a coagulant aid solution into the oxidized slurry, carrying out gel breaking and flocculation on the slurry, and then carrying out solid-liquid separation;
(8) and treating the separated liquid by an iron-carbon micro-electrolysis and Fenton oxidation water treatment device.
2. The method for reducing, harmlessly recycling drilling waste mud according to claim 1, wherein the oxidant comprises one or more of hydrogen peroxide, sulfamic acid, chlor-alkali and the like.
3. The method for reducing, detoxifying and recycling drilling waste mud according to claim 1, wherein the flocculant comprises an inorganic flocculant: one or more of ferrous sulfate, ferrous chloride, alum, polyaluminium chloride, basic aluminium chloride, aluminium sulfate and calcium chloride, and an organic flocculant: one or more of sodium polyacrylate, polyacrylamide, polystyrene sulfonate and polyethylene oxide.
4. The method for reducing, harmlessly recycling drilling waste mud according to claim 1, wherein the flocculant is 20 to 30 wt%, the coagulant aid solution is 0.1 to 0.2 wt%, the flocculant is added in an amount of 10 to 15% by volume of the mud, and the coagulant aid solution is added in an amount of 15 to 20ppm by volume of the mud.
5. The method for reducing, detoxifying and recycling drilling waste mud according to claim 1 wherein the amount of said oxidizing agent added is 0.3% -0.8% of the volume of the mud.
6. The utility model provides a harmless resourceful treatment system of drilling waste mud minimizing which characterized in that includes:
the mud collecting tank is used for collecting waste drilling mud discharged by the solid control equipment of the drilling team;
the high-level buffer tank is used for conveying the slurry in the slurry collecting tank to the high-level buffer tank through a sand pump;
the first solid-liquid separation device is used for carrying out solid-liquid separation on the slurry in the high-level collection tank;
the temporary storage tank is used for allowing the liquid-phase slurry separated by the first solid-liquid separation device to enter;
the polymer system solid phase discharged materials after being separated by the first solid-liquid separation device are conveyed to a mud cake stacking area through the first auger;
the solid phase discharged material of the sulfonation system separated by the first solid-liquid separation device flows into the low-level collection tank; adding water into the low-level collection tank and stirring to fluidize and homogenize the slurry in the low-level collection tank; then, performing gel breaking and flocculation on the slurry;
the second solid-liquid separation device is used for carrying out solid-liquid separation on the slurry flowing out of the low-level collection tank;
and the liquid-phase slurry separated by the second solid-liquid separation device enters the filtrate tank.
7. The system of claim 6, wherein the low-level collection tank is divided into a first compartment and a second compartment, the first compartment receives the polymer system solid phase effluent, the second compartment receives the sulfonation system solid phase effluent, and the first auger is connected to the second compartment.
8. The system for reducing, harmlessly recycling drilling waste mud according to claim 6, wherein the first solid-liquid separation device is a high-frequency dryer.
9. The system for reducing, detoxifying and recycling drilling waste mud according to claim 6, wherein the second solid-liquid separation device is a plate-and-frame filter press.
10. The system for reducing, detoxifying and treating drilling waste mud according to claim 6, wherein the mud in the filtrate tank is delivered to the drilling crew conical tank through a mud pump.
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| CN117645355A (en) * | 2023-12-04 | 2024-03-05 | 知和环保科技有限公司 | Sewage treatment agent and preparation method and application thereof |
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