CN101363311B - Technological process for comprehensive treatment for waste drilling fluid following drill for oil-gas field - Google Patents

Technological process for comprehensive treatment for waste drilling fluid following drill for oil-gas field Download PDF

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CN101363311B
CN101363311B CN2008101415196A CN200810141519A CN101363311B CN 101363311 B CN101363311 B CN 101363311B CN 2008101415196 A CN2008101415196 A CN 2008101415196A CN 200810141519 A CN200810141519 A CN 200810141519A CN 101363311 B CN101363311 B CN 101363311B
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separation
solid
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CN101363311A (en
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郭学峰
茆明军
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Puyang environmental Polytron Technologies Inc
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郭学峰
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Abstract

The present invention relates to a technical method for treating oil-gas field waste drilling fluid comprehensively during drilling, being the treatment technology of the oil-gas field waste drilling fluid. According to the principles of treating during drilling, separating solid from fluid, treating comprehensively by sorts, realizing maximum comprehensive utilization and realizing energy conservation and emission reduction, the whole comprehensive treatment technology of the waste drilling fluid is divided into four steps of fluid-chip separation, solid-fluid separation, sewage disposal and purified water storage. The waste drilling fluid is treated by procedures of primary purification cleaning, cyclone desanding, cyclone deoiling, secondary purification cleaning, tertiary purification cleaning, solid-fluid separation by slurry destabilization, destabilizing filtrate by adding drug, air floatation, micro electrolyzing, filtering by compulsion, oxygenating and fine absorbing and filtering to wash and separate fluid and chips and then purify rock chips for using, wherein, partial slurry is recycled for proportioning slurry. The residual slurry is caked for using after solid-fluid separation and dehydration. The main contamination index of the sewage disposal reaches the standards. The present invention is convenient for reusing the field, reusing fluid-chip separation and cleaning water or achieving the goal of standard discharge of comprehensive treatment during drilling.

Description

The process that is used for comprehensive treatment for waste drilling fluid following drill for oil-gas field
One, technical field: the present invention relates to the treatment technology of oil gas field waste drilling fluid, in particular for the process of comprehensive treatment for waste drilling fluid following drill for oil-gas field.
Two, background technology: in the oilfield drilling process, along with drill bit constantly creeps into to underground, will produce a certain amount of waste drilling fluid with boring, these waste drilling fluids are the mixtures that formed by well drilling detritus, drilling mud, drilling waste water, sump oil.The environmentally hazardous main chemical compositions of waste drilling fluid has modifiers such as foreign material and the pitch in hydro carbons, salt, each base polymer, heavy metal ion, the bolognian stone; The major pollutants characteristics are to have characteristics such as high chroma, high petroleum-type, high COD, high suspended matter, high salinity, are the primary pollution source that produces in the petroleum exploration and development process.The every brill of oil gas field finishes a bite well, all will lose next discarded mud pit in the original place.An oil gas field has thousands of mouthfuls of wells, and thousands of discarded slurry ponds are just arranged, and the waste drilling fluid in each mud pit has hundreds of side at least, and several thousand sides are arranged at most.As if stacking in the well site or burying,, will cause very serious pollution to soil, water source, farmland and air on every side in case washed away by rainwater immersion, river.According to " the national hazardous waste register " implemented on August 1st, 2008, the mud that waste drilling fluids disposal produces has been classified hazardous waste as, and refuse classification HW08, refuse code are 071-002-08.In the face of strict more environmental protection standard, waste drilling fluid imperative with boring the comprehensive regulation.
Before this, traditional disposal options is to be emitted in the waste mud sewage reservoir in well site, is cured multiple looks processing according to administering the solid useless way of burying in back in the pond on the spot, to reduce its contamination hazard.Solidification method is because the adding of a large amount of curing compound has increased the total amount of discarded object and the cost of comprehensive utilization.Because there are long-term pollution hidden trouble and risks such as seepage, pollutant leaching in waste mud sewage storage pool, leachate still can produce serious pollution to underground water and soil earth, has not met environmental protection by this method of new standard and has disposed requirement.
Patent of invention " a kind of oilfield waste thing sump oil mud resource processing method " ZL200610018062.0 is a kind of more perfect solution; But technology relative complex; The concrete grammar that landwaste purify to clean is not described, " process technology that is used for oil drilling fracturing work liquid waste processing " ZL200410038043.5, " a kind of be used for the technology that the drilling waste liquid focuses on " application are that the oil field contains the less sewage waste liquor of mud amount and handles, and the bigger waste drilling fluid of solid concentration is handled has limitation; " a kind of be used for the process that waste drilling fluid focuses on and fully utilizes " reclaims the technology that focuses on; Be not suitable for handling with boring, it is to use the vibrosieve sand-washing device that " being used for the technology that drilling waste while drilling before falling onto ground in oil-gas fields is handled " its landwaste separates the cleaning first module, cleans the reuse that has reduced slime water with drilling waste water earlier and is worth; The reusing sewage rate is lower; And circulation, flushing, stir morely with electric-motor pump, power consumption is big, and flow process is longer relatively.
Three, summary of the invention: the purpose of this invention is to provide the process that is used for comprehensive treatment for waste drilling fluid following drill for oil-gas field that effective control situ of drilling well pollutes; It has overcome the deficiency that other technology exists; Follow with boring and handle; Separation of Solid and Liquid, the classification comprehensive regulation fully utilizes and realizes the principle of energy-saving and emission-reduction to greatest extent; The waste drilling fluid comprehensive regulation integrated artistic separatory bits separation, Separation of Solid and Liquid, sewerage treatment, the storage reuse four-stage of purifying waste water; According to primary purification cleaning, eddy flow desanding, cyclone deoiling, double purification clean, purify for three times clean, muddy water takes off that firm liquid separates, broken steady, the coagulation of filtrating dosing, air supporting, little electrolysis, forced filtration, oxidation, meticulous adsorption filtration flow processing, realizes that the liquid bits clean to separate the utilization of after purification landwaste, slurry is joined in wherein a part of muddy water reuse; Residue muddy water solid-liquid separation dehydration mud becomes the cake utilization, is convenient to directly burn or the processing again of baking bricks; Sewerage treatment major pollutants index is up to standard, be convenient to place reuse, liquid bits separate water for cleaning reuse or qualified discharge with boring comprehensive regulation target.The activities of comprehensive treatment for waste drilling fluid following drill is achieved in that
Liquid bits separation phase is that waste drilling fluid once cleans through carrier lift entering primary purification cleaning agitator; Water for cleaning is with clear water or drilling waste water, and the also water outlet after filtrate water in the available processes flow process or oxidation, the filtration is after once cleaning stirring; Get into hydrocyclone with the mortar pump supercharging; Hydrocyclone separates muddy water and gets into the reuse of drilling well circulating tank, and when the waste drilling fluid oil-containing, hydrocyclone separation muddy water gets into the reuse of drilling well circulating tank after getting into the degreaser cyclone oil removing again; The sump oil of getting rid of advances to irritate recovery; Remain the muddy water entering that no longer utilizes and take off steady jar of Separation of Solid and Liquid flow process continuation processing, the cutting grain entering double purification that is stained with a small amount of mud that the centrifugal desander sand export of eddy flow is discharged cleans agitator, and water for cleaning is from backflow rinse water or three cleaning overflow waters of muddy water treatment system; The landwaste of bottom sedimentation is sent into the purification washer three times with screw conveyer or gravity flow, the muddy water gravity flow that secondary cleaning is discharged or pump into and take off steady jar of Separation of Solid and Liquid and handle.Get into three times through the landwaste that secondary cleaning is discharged and purify stirring and washing in the cleaning agitator; Three rinse water are from the oxidize water of sewage disposal system or filter water outlet or filtrate water; The muddy water gravity flow of clean discharging for three times or pump into and take off steady jar of Separation of Solid and Liquid and handle again; Clean the back sand setting and discharge, be purified the landwaste utilization with screw conveyer.
Primary purification cleans, double purification cleans, purify the alr mode that cleans agitator for three times can adopt air aeration to stir or mechanical agitation.
Solids-liquid separation step is the muddy water of hydrocyclone discharge, double purification to be cleaned the muddy water of discharging, the muddy water that purifies the cleaning discharge three times, well site conversion mud gravity flow or pump into take off steady jar; After dosing measuring pump dosing stirring is taken off surely; Get into solid-liquid separating machine with the supercharging of press filtration pump and carry out the muddy water Separation of Solid and Liquid, solid phase is pressed into dehydrated sludge cake.Solid-liquid separating machine can be with any of filter press or belt filter press or folded spiral shell formula dewaterer.Dehydrated sludge cake can directly burn or admix in proportion with clay or shale powder and be used for baking bricks utilization; Also can in taking off steady filling, add silicate and stir back entering Separation of Solid and Liquid flow process; Leachate is up to standard after the dehydrated sludge cake mummification that solid phase forms after handling; Silicate adds part by weight: cement 1 ~ 5%, water glass 0.5 ~ 3%.
The sewerage treatment stage is that the filtrating part that solid-liquid separating machine is deviate from is used for dilution conversion mud water; Residual filtrate gets into sewage disposal system; Add conditioning agent, coagulation coalescent, flocculant and oxidant with the dosing measuring pump; Break steady, coagulation earlier, air supporting is handled, water outlet is purified water advance to purify waste water storage tank utilization or discharging through oxidation and meticulous adsorption filtration flow processing; When COD is difficult to when up to standard; Through broken steady, coagulation, air supporting treatment yielding water; Little electrolysis agitator of forming through the iron carbon particle is again handled, and water outlet adds milk of lime and gets into the filter press forced filtration, is purified water through oxidation and meticulous adsorption filtration flow processing again and gets into purify waste water storage tank utilization or discharging; System's scum silica frost and sedimentation mud flow automatically or pump into and takes off steady jar of circular treatment.
Purifying waste water and storing the reuse stage is that filtrate water in the flow process, sewage disposal system oxidize water, filtered water are as the utilization of wash cycles water.The storage tank of purifying waste water is up to standard purifies waste water as place, well site, the reuse of equipment cleaning water, surplus water qualified discharge.
The medicament conditioning agent that adds in the above-mentioned flow process, coagulation coalescent, flocculant and oxidant are respectively: conditioning agent is soda acid or lime solution, to regulate waste liquid pH value 5~9; The coagulation coalescent is any of aluminium polychloride, polymeric aluminium ferrum silicate, aluminum sulfate, addition by different liquid waste concentrations 0.5%~10%; Flocculant is any of PAMC, PAMA, amphiprotic polyacrylamide, addition by different liquid waste concentrations at 7ppm~15ppm; Oxidant is any of hydrogen peroxide solution, calcium hypochlorite, chlorine dioxide, sodium chlorate, potassium permanganate, under acid condition, and addition 0.5%~5%.
But adorn integratedly by the equipment sledge that above-mentioned flow process is formed, be convenient to the situ of drilling well mobile operating.
Meaning of the present invention is: realize waste drilling fluid with boring integrated treatment, improve the utilization rate of separating water outlet, waste drilling fluid landwaste, mud, sewage, sump oil are separated and processing up to standard, effectively prevent and treat situ of drilling well and pollute.
Four, description of drawings: Fig. 1 is the process overall craft flow chart of steps that is used for comprehensive treatment for waste drilling fluid following drill for oil-gas field.
Fig. 2 is the process method flow chart that is used for comprehensive treatment for waste drilling fluid following drill for oil-gas field.
Five, the specific embodiment: in Fig. 1 and Fig. 2; The present invention follows with boring and handles; Separation of Solid and Liquid, the classification comprehensive regulation fully utilizes and realizes the principle of energy-saving and emission-reduction to greatest extent; The waste drilling fluid comprehensive regulation integrated artistic separatory bits separation, Separation of Solid and Liquid, sewerage treatment, the storage reuse four-stage of purifying waste water; According to primary purification cleaning, eddy flow desanding, cyclone deoiling, double purification clean, purify for three times clean, muddy water takes off that firm liquid separates, broken steady, the air supporting of filtrating dosing, forced filtration, oxidation, fine filtering flow processing, realizes that the liquid bits clean to separate the utilization of after purification landwaste, slurry is joined in wherein a part of muddy water reuse; Residue muddy water solid-liquid separation dehydration mud becomes the cake utilization, is convenient to directly burn or the processing again of baking bricks; Sewerage treatment major pollutants index is up to standard, be convenient to place reuse, liquid bits separate water for cleaning reuse or qualified discharge with boring comprehensive regulation target.The activities of comprehensive treatment for waste drilling fluid following drill is achieved in that
Liquid bits separation phase is that waste drilling fluid once cleans through carrier lift entering primary purification cleaning agitator; Water for cleaning is with clear water or drilling waste water, also the filtrate water in the available processes flow process or filter after water outlet or oxidation processes water, after once cleaning stirring; Get into hydrocyclone with the mortar pump supercharging; Hydrocyclone separates muddy water and gets into the reuse of drilling well circulating tank, and when the waste drilling fluid oil-containing, hydrocyclone separation muddy water gets into the reuse of drilling well circulating tank after getting into the degreaser cyclone oil removing again; The sump oil of getting rid of advances to irritate recovery; Remain the muddy water entering that no longer utilizes and take off steady jar of Separation of Solid and Liquid flow process continuation processing, the cutting grain entering double purification that is stained with a small amount of mud that the centrifugal desander sand export of eddy flow is discharged cleans agitator, and water for cleaning is from backflow rinse water or three cleaning overflow waters of muddy water treatment system; The landwaste of bottom sedimentation is sent into the purification washer three times with screw conveyer or gravity flow, the muddy water gravity flow that secondary cleaning is discharged or pump into and take off steady jar of Separation of Solid and Liquid and handle.Get into three times through the landwaste that secondary cleaning is discharged and purify stirring and washing in the cleaning agitator, rinse water is cleaned the back sand setting and is discharged with screw conveyer from oxidize water or the filtration water outlet or the filtrate water of sewage disposal system, is purified the landwaste utilization.
Primary purification cleans, double purification cleans, purify the alr mode that cleans agitator for three times can adopt air aeration to stir or mechanical agitation.
Solids-liquid separation step is the muddy water of hydrocyclone discharge, double purification to be cleaned the muddy water of discharging, the muddy water that purifies the cleaning discharge three times, well site conversion mud gravity flow or pump into take off steady jar; After dosing measuring pump dosing stirring is taken off surely; Get into solid-liquid separating machine with the supercharging of press filtration pump and carry out the muddy water Separation of Solid and Liquid, solid phase is pressed into dehydrated sludge cake.Solid-liquid separating machine can be with any of filter press or belt filter press or folded spiral shell formula dewaterer.Dehydrated sludge cake can directly burn or admix in proportion with clay or shale powder and be used for baking bricks utilization; Also can in taking off steady filling, add silicate and stir back entering Separation of Solid and Liquid flow process; Leachate is up to standard after the dehydrated sludge cake mummification that solid phase forms after handling; Silicate adds part by weight: cement 1 ~ 5%, silicate of soda or water glass 0.5 ~ 3%.
The sewerage treatment stage is that the filtrating part that solid-liquid separating machine is deviate from is used for dilution conversion mud water; Residual filtrate gets into sewage disposal system; Add conditioning agent, coagulation coalescent, flocculant and oxidant with the dosing measuring pump; Break steady, coagulation earlier, air supporting is handled, water outlet is purified water advance to purify waste water storage tank utilization or discharging through oxidation and fine filtering flow processing; When COD is difficult to when up to standard; Through broken steady, coagulation, air supporting treatment yielding water; Little electrolysis agitator of forming through the iron carbon particle is again handled, and water outlet adds milk of lime and gets into the filter press forced filtration, is purified water through oxidation and fine filtering flow processing again and gets into purify waste water storage tank utilization or discharging; System's scum silica frost and sedimentation mud flow automatically or pump into and takes off steady jar of circular treatment.
Purifying waste water and storing the reuse stage is that filtrate water in the flow process, sewage disposal system oxidize water, filtered water are as the utilization of wash cycles water.The storage tank of purifying waste water is up to standard purifies waste water as place, well site, the reuse of equipment cleaning water, surplus water qualified discharge.
The medicament conditioning agent that adds in the above-mentioned flow process, coagulation coalescent, flocculant and oxidant are respectively: conditioning agent is soda acid or lime solution, to regulate waste liquid pH value 5~9; The coagulation coalescent is any of aluminium polychloride, polymeric aluminium ferrum silicate, aluminum sulfate, addition by different liquid waste concentrations 0.5%~10%; Flocculant is any of PAMC, PAMA, amphiprotic polyacrylamide, addition by different liquid waste concentrations at 7ppm~15ppm; Oxidant is any of hydrogen peroxide solution, calcium hypochlorite, chlorine dioxide, sodium chlorate, potassium permanganate, under acid condition, and addition 0.5%~5%.
But adorn integratedly by the equipment sledge that above-mentioned flow process is formed, be convenient to the situ of drilling well mobile operating.

Claims (8)

1. the process that is used for comprehensive treatment for waste drilling fluid following drill for oil-gas field; It is characterized in that: the waste drilling fluid comprehensive regulation integrated artistic separatory bits separation, Separation of Solid and Liquid, sewerage treatment, the storage reuse four-stage of purifying waste water; According to primary purification cleaning, eddy flow desanding, cyclone deoiling, double purification clean, purify for three times clean, muddy water takes off that firm liquid separates, broken steady, the coagulation of filtrating dosing, air supporting, little electrolysis, forced filtration, oxidation, fine filtering flow processing; Realize that the liquid bits clean separation after purification landwaste and utilize, slurry is joined in wherein a part of muddy water reuse; Residue muddy water solid-liquid separation dehydration mud becomes the cake utilization, is convenient to directly burn or the processing again of baking bricks; Sewerage treatment major pollutants index is up to standard, be convenient to place reuse, liquid bits separate water for cleaning reuse or qualified discharge with boring comprehensive regulation target; The equipment sledge of forming is adorned integrated, is convenient to the situ of drilling well mobile operating and handles with boring.
2. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1; It is characterized in that: liquid bits separation phase is that waste drilling fluid once cleans through carrier lift entering primary purification cleaning agitator; Water for cleaning is with clear water or drilling waste water, or with the filtrate water in the handling process or water outlet or oxidation processes water after filtering, after once cleaning stirring; Get into hydrocyclone with the mortar pump supercharging; Hydrocyclone separates muddy water and gets into the reuse of drilling well circulating tank, and when the waste drilling fluid oil-containing, hydrocyclone separation muddy water gets into the reuse of drilling well circulating tank after getting into the degreaser cyclone oil removing again; The sump oil of getting rid of advances a jar recovery; Remain the muddy water entering that no longer utilizes and take off steady jar of Separation of Solid and Liquid flow process continuation processing, the cutting grain entering double purification that is stained with a small amount of mud that the centrifugal desander sand export of eddy flow is discharged cleans agitator, and water for cleaning is from backflow rinse water or three cleaning overflow waters of muddy water treatment system; The landwaste of bottom sedimentation is sent into the purification washer three times with screw conveyer or gravity flow, the muddy water gravity flow that secondary cleaning is discharged or pump into and take off steady jar of Separation of Solid and Liquid and handle; Get into three times through the landwaste that secondary cleaning is discharged and purify stirring and washing in the cleaning agitator; Rinse water is from oxidize water or the filtration water outlet or the filtrate water of sewage disposal system; Clean the muddy water gravity flow of discharging for three times or pump into and take off steady jar; Separation of Solid and Liquid is handled again, cleans the back sand setting and discharges with screw conveyer, is purified the landwaste utilization.
3. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1 is characterized in that: primary purification cleans, double purification cleans, purify the alr mode that cleans agitator for three times can adopt air aeration to stir or mechanical agitation.
4. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1; It is characterized in that: solids-liquid separation step is the muddy water of hydrocyclone discharge, double purification to be cleaned the muddy water of discharging, the muddy water that purifies the cleaning discharge three times, well site conversion mud gravity flow or pump into take off steady jar; After dosing measuring pump dosing stirring is taken off surely; Get into solid-liquid separating machine with the supercharging of press filtration pump and carry out the muddy water Separation of Solid and Liquid; Solid phase is pressed into dehydrated sludge cake, and solid-liquid separating machine can be with any of belt filter press or folded spiral shell formula dewaterer.
5. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1; It is characterized in that: the sewerage treatment stage is that the filtrating part that solid-liquid separating machine is deviate from is used for dilution conversion mud water; Residual filtrate gets into sewage disposal system; Add conditioning agent, coagulation coalescent, flocculant and oxidant with the dosing measuring pump; Break steady, coagulation earlier, air supporting is handled, water outlet is purified water advance to purify waste water storage tank utilization or discharging through oxidation and fine filtering flow processing; When COD is difficult to when up to standard; Handle through broken steady, coagulation, air supporting; Water outlet is handled through little electrolysis agitator that the iron carbon particle is formed again, and water outlet adds milk of lime and gets into the filter press forced filtration, is purified water through oxidation and fine filtering flow processing again and gets into purify waste water storage tank utilization or discharging; System's scum silica frost and sedimentation mud flow automatically or pump into and takes off steady jar of circular treatment.
6. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1; It is characterized in that: purifying waste water and storing the reuse stage is as the utilization of wash cycles water with filtrate water, sewage disposal system oxidize water, filtered water in the flow process; The purifying waste water in the storage tank of purifying waste water as place, well site, the reuse of equipment cleaning water, surplus water qualified discharge.
7. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1; It is characterized in that: the mud cake that solid phase forms after the Separation of Solid and Liquid, or directly burning, or admix in proportion with clay or shale powder and to be used for the usefulness of baking bricks; Or get into the Separation of Solid and Liquid flow process after in taking off steady filling, adding the silicate stirring; Leachate is up to standard after the mud cake mummification that solid phase forms after handling, and silicate adds part by weight and is: cement 1~5%, silicate of soda or water glass 0.5~3%.
8. the process that is used for the waste drilling fluid following drill for oil-gas field integrated treatment according to claim 1 is characterized in that: the medicament conditioning agent of adding, coagulation coalescent, flocculant and oxidant are respectively: conditioning agent is a soda acid, to regulate waste liquid pH value 5~9; The coagulation coalescent is any of aluminium polychloride, polymeric aluminium ferrum silicate, aluminum sulfate, addition by different liquid waste concentrations 0.5%~10%; Flocculant is any of PAMC, PAMA, amphiprotic polyacrylamide, addition by different liquid waste concentrations at 7ppm~15ppm; Oxidant is any of hydrogen peroxide solution, calcium hypochlorite, chlorine dioxide, sodium chlorate, potassium permanganate, under acid condition, and addition 0.5%~5%.
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