CN102019110A - Chemically reinforced solid-liquid separation method for well drilling waste liquid - Google Patents

Chemically reinforced solid-liquid separation method for well drilling waste liquid Download PDF

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Publication number
CN102019110A
CN102019110A CN2009100938567A CN200910093856A CN102019110A CN 102019110 A CN102019110 A CN 102019110A CN 2009100938567 A CN2009100938567 A CN 2009100938567A CN 200910093856 A CN200910093856 A CN 200910093856A CN 102019110 A CN102019110 A CN 102019110A
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Prior art keywords
waste liquid
drilling
liquid
solid
reaction
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CN2009100938567A
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CN102019110B (en
Inventor
邓皓
刘光全
张晓飞
许毓
王蓉沙
谢水祥
赵欣梅
岳勇
吴百春
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China National Petroleum Corp
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China National Petroleum Corp
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Abstract

The invention relates to a chemically reinforced solid-liquid separation method for a well drilling waste liquid, comprising the following steps of: mixing the well drilling waste liquid with clear water, regulating the solid content of the well drilling waste liquid to 5%-10%, and then carrying out capillary pumping for not more than 2500s; adding a destabilizing agent comprising 0.3%-0.5% of sulfuric acid or nitric acid, 0.4%-1.0% of polyaluminium silicate chloride and 0.2%-0.3% of polyferric sulfate; adding adsorbents comprising 1%-1.5% of quick lime and 0.5%-1% of calcium chloride; adding a flocculating agent comprising 0.005%-0.015% of cationic polyacrylamide, anionic polyacrylamide or amphoteric polyacrylamide; accomplishing solid-liquid separation by using a centrifugal machine and then respectively discharging separated solid phase and liquid phase, wherein the centrifugal factor of the centrifugal machine is 2000-2200g, the water content of discharged mud is not greater than 70%, the solid content of the discharged water is not greater than 0.5%, and the recovery rate of the solid phase is not less than 90%. The chemically reinforced solid-liquid separation method reduces the difficulty in subsequent advanced treatment on the well drilling waste liquid, thereby creating the favorable conditions for resource recycling of the liquid phase.

Description

The chemical enhanced solid-liquid separating method of a kind of waste liquid of drilling
Technical field
The present invention relates to the oil drilling technical field, the chemical enhanced solid-liquid separating method of particularly a kind of waste liquid of drilling.The oil-gas field surface engineering technology that belongs to petroleum industry.
Background technology
In the natural petroleum gas field production process, drillng operation produces a large amount of waste liquid of drilling.Along with drilling depth increases and the difficulty increasing, the kind of the chemical addition agent that adds in the drilling fluid and quantity are also more and more, the composition of waste liquid of drilling also becomes and becomes increasingly complex, compositions such as the hydro carbons that wherein contains, inorganic salts, high molecular polymer, heavy metal, in case, will bring serious eco-environmental impact because of the mishandling surrounding enviroment that enter.At present, " national hazardous waste register " clearly listed waste liquid of drilling wherein in, and in the face of the environmental standard of increasingly stringent, the processing handling problems of waste liquid of drilling needs to be resolved hurrily.
That the conventional process mode of waste liquid of drilling has is recycling, consolidation process, re-injection processing etc.Recycle utilization is by to dissimilar drilling fluid Classification Managements, after the part premium drilling fluid got rid of bulky grain solid phase impurity, add the drilling process that assistant medicament is applied to other oil well again, the restriction of well spacing and circulation of drilling fluid number of times but this The Application of Technology is subjected to constructing.The consolidation process mode generally adopts materials such as consolidating agent, flyash, and is fixed with drilling fluid mixed, earthing landfill or be used to lay well site and road then, and this technology is because a large amount of curing agent that add, and discarded object total amount and processing cost significantly increase.Re-injection is handled then higher to the stratum conditional request, and has the risk of polluted underground water environment.Above-mentioned processing method is difficult to properly settle the problem of waste liquid of drilling high stability, high-pollution load, causes that processing cost is higher, adaptability is relatively poor.Therefore, destroy its rock-steady structure, reducing pollutional load is the key that realizes the waste liquid of drilling advanced treating.
Present domestic part enterprise is carrying out part Study aspect the processing of waste liquid of drilling Separation of Solid and Liquid, Zhongyuan Petroleum Exploration Bureau drilling well institute is benefiting our pursuits aspect the waste liquid of drilling Separation of Solid and Liquid inorganic agent, Southwest Petrol University can finish effective processing of well-drilling waste water based on the vehicle mobile equipment of this principle exploitation, but also is difficult to realize effective separation of waste liquid of drilling.
Summary of the invention
The objective of the invention is: adopt a kind of reagent combination of forming by coagulant, adsorbent, flocculant etc., and mechanical separation equipment, realize that taking off of waste liquid of drilling is steady, decrement and Separation of Solid and Liquid, effectively reduce the solid waste volume that needs harmlessness disposing, reduce liquid phase pollutional load and subsequent treatment difficulty.
The technical solution used in the present invention is: the chemical enhanced solid-liquid separating equipment of waste liquid of drilling by buffering regulating reservoir 1, take off steady reaction tank 2, adsorption reaction pond 3, flocculation tank 4, horizontal screw centrifuge 5, medicine system 6 and form.In buffering regulating reservoir 1, waste liquid of drilling is mixed with a certain amount of clear water, reduce the plastic viscosity of waste liquid of drilling, improve the reaction efficiency of other medicaments.Waste liquid of drilling after dilution is regulated enters and takes off steady reaction tank 2, adds coagulant by medicine system 6, reduces clay particle viscosity and shearing force, breaks connecting structure, destroys its stable state.Waste liquid of drilling through taking off steady reaction enters adsorption reaction pond 3, adds adsorbent by medicine system 6, further compresses the clay particle surface electric double layer, increases the proportion and the volume of particle.Waste liquid of drilling through adsorption reaction enters flocculation tank 4, adds flocculant by medicine system 6, and clay particle is gathered into large-size particle.Waste liquid of drilling through flocculation reaction enters horizontal screw centrifuge 5, finishes Separation of Solid and Liquid therein, separates solid phase and liquid phase and discharges respectively.
Below each composition be benchmark with waste liquid of drilling quality 100%;
It is 5~10% that described buffering regulating reservoir 1 is handled out liquid-solid containing, the capillary pumped time (CST)≤2500s.
To take off the coagulant prescription that steady reaction tank (2) adds (mass percent, down with) be sulfuric acid/nitric acid 0.3~0.5%, gather silicon aluminium chloride 0.4~1.0%, bodied ferric sulfate 0.2~0.3%.
The adsorbent prescription that adsorption reaction pond 3 adds is quick lime 1~1.5%, calcium chloride 0.5~1%.
The flocculant prescription that flocculation tank 4 adds is PAMC/anion pp
Acid amides/amphiprotic polyacrylamide 0.005~0.015%.
Centrifuge 5 centrifugal factors are 2000~2200g, mud extraction moisture content≤70%, and water outlet contains admittedly≤and 0.5%, solid-phase recovery 〉=90%.
The chemical enhanced solid-liquid separation technique of described waste liquid of drilling, the whole process time of staying is 21~28min, wherein dilution buffer stage 3~4min, take off the steady stage of reaction 6~8min, adsorption reaction stage 6~8min, flocculation reaction stage 6~8min.
Chemical enhanced solid-liquid separating method of the present invention at first utilizes the mechanisms of action such as the neutralization take off steady medicament, absorption, chelating, reduces clay particle viscosity and shearing force, breaks connecting structure, destroys its stable state; Utilize the absorption property of adsorbent then, further compress the clay particle surface electric double layer, make it be in free state, increase the proportion and the volume of particle simultaneously; Utilize the volume of high polymer coagulant to sweep at last, absorption, bridging action, clay particle is gathered into large-size particle, utilize mechanical separation device to finish Separation of Solid and Liquid again.Separate the mud extraction moisture content and can reduce to below 70%, be convenient to further add harmless treatment behind the fixed medicament.Because add the effects such as steady and absorption of taking off of various medicaments, most of pollutant in the waste liquid of drilling enters solid phase with clay particle, the composition that remains in the liquid phase reduces significantly, effectively reduces the difficulty of following liquid-phase advanced treating, for advantage has been created in the resource reuse of liquid phase.
1. take off steady, absorption, coagulation, centrifugation technique use in conjunction, can realize the efficient Separation of Solid and Liquid of waste liquid of drilling.
2. solid volume after treatment obviously reduces, and moisture content is reduced to below 70% by 90%, and the harmless treatment difficulty reduces.
3. centrifugal water outlet contains admittedly reduces to below 0.5%, and pollutant load is lower, is convenient to follow-up advanced treating.
4. compare with traditional curing process, medicament expense reduces by 40~50 yuan/m 3, operating cost reduces by 20%.
Description of drawings
The chemical enhanced solid-liquid separating method schematic flow sheet of Fig. 1 waste liquid of drilling.
Among the figure, 1. the buffering regulating reservoir 2. takes off steady reaction tank, 3. adsorption reaction pond, 4. flocculation tank, 5. horizontal screw centrifuge, 6. medicine system.
The specific embodiment
This project has been finished the theoretical research of the chemical enhanced Separation of Solid and Liquid of waste liquid of drilling, and having developed disposal ability is 10m 3The waste liquid of drilling treating apparatus of/h, field trial can be realized the efficient Separation of Solid and Liquid processing of waste liquid of drilling, device mud extraction moisture content 65~68%, and water outlet contains 0.3~0.5% admittedly.
The chemical enhanced equipment for separating liquid from solid of waste liquid of drilling by buffering regulating reservoir 1, take off steady reaction tank 2, adsorption reaction pond 3, flocculation tank 4, horizontal screw centrifuge 5, medicine system 6 and form.
Embodiment 1
Below each composition be benchmark with waste liquid of drilling quality 100%;
It is 5% that described buffering regulating reservoir 1 processing fluid stereoplasm amount contains, the capillary pumped time (CST)≤2500s.
To take off the coagulant prescription that steady reaction tank 2 adds (mass percent, down with) be nitric acid 0.3%, gather silicon aluminium chloride 0.4% and bodied ferric sulfate 0.2%.
The adsorbent prescription that adsorption reaction pond 3 adds is quick lime 1% and calcium chloride 0.5%.
The flocculant prescription that flocculation tank 4 adds is a PAMC 0.015%.
Centrifuge 5 centrifugal factors are 2000~2200g, mud extraction moisture content≤70%, and water outlet contains admittedly≤and 0.5%, solid-phase recovery 〉=90%.
The whole process time of staying is 21~28min, wherein dilution buffer stage 3~4min, take off the steady stage of reaction 6~8min, adsorption reaction stage 6~8min, flocculation reaction stage 6~8min.
Embodiment 2
Below each composition be benchmark with waste liquid of drilling quality 100%;
It is 10% that described buffering regulating reservoir 1 is handled out liquid-solid containing, the capillary pumped time (CST)≤2500s.
To take off the coagulant prescription that steady reaction tank 2 adds (mass percent, down with) be sulfuric acid 0.3%, gather silicon aluminium chloride 1.0% and bodied ferric sulfate 0.3%.
The adsorbent prescription that adsorption reaction pond 3 adds is quick lime 1.5% and calcium chloride 1%.
The flocculant prescription that flocculation tank 4 adds is a PAMA 0.015%.
Centrifuge 5 centrifugal factors are 2000~2200g, mud extraction moisture content≤≤ 70%, and water outlet contains admittedly≤and 0.5%, solid-phase recovery 〉=90%.
The whole process time of staying is 21~28min, wherein dilution buffer stage 3~4min, take off the steady stage of reaction 6~8min, adsorption reaction stage 6~8min, flocculation reaction stage 6~8min.
Embodiment 3
Below each composition be benchmark with waste liquid of drilling quality 100%;
It is 7% that described buffering regulating reservoir 1 is handled out liquid-solid containing, the capillary pumped time (CST)≤2500s.
To take off the coagulant prescription that steady reaction tank 2 adds (mass percent, down with) be nitric acid 0.5%, gather silicon aluminium chloride 0.6% and bodied ferric sulfate 0.3%.
The adsorbent prescription that adsorption reaction pond 3 adds is quick lime 1% and calcium chloride 0.8%.
The flocculant prescription that flocculation tank 4 adds is an amphiprotic polyacrylamide 0.005%.
Centrifuge 5 centrifugal factors are 2000~2200g, mud extraction moisture content≤≤ 70%, and water outlet contains admittedly≤and 0.5%, solid-phase recovery 〉=90%.
The whole process time of staying is 21~28min, wherein dilution buffer stage 3~4min, take off the steady stage of reaction 6~8min, adsorption reaction stage 6~8min, flocculation reaction stage 6~8min.

Claims (2)

1. chemical enhanced solid-liquid separating method of waste liquid of drilling, equipment by buffering regulating reservoir (1), take off steady reaction tank (2), adsorption reaction pond (3), flocculation tank (4), horizontal screw centrifuge (5), medicine system (6) and form, it is characterized in that: following each composition is a benchmark with waste liquid of drilling quality 100%;
In buffering regulating reservoir (1), waste liquid of drilling is mixed with clear water, regulating waste liquid of drilling solid phase mass percent is 5~10%, the capillary pumped time (CST)≤2500s;
Waste liquid of drilling after dilution is regulated enters and takes off steady reaction tank (2), adds coagulant by medicine system (6), and adding the coagulant mass percent is sulfuric acid or nitric acid 0.3~0.5%, poly-silicon aluminium chloride 0.4~1.0% and bodied ferric sulfate 0.2~0.3%;
Waste liquid of drilling through taking off steady reaction enters adsorption reaction pond (3), adds adsorbent by medicine system (6), and adding adsorbent mass percentage is quick lime 1~1.5% and calcium chloride 0.5~1%;
Waste liquid of drilling through adsorption reaction enters flocculation tank (4), adds flocculant by medicine system (6), and adding the flocculant mass percent is PAMC, PAMA or amphiprotic polyacrylamide 0.005~0.015%;
Waste liquid of drilling through flocculation reaction enters centrifuge (5), finishes Separation of Solid and Liquid therein, separates solid phase and liquid phase and discharges respectively, the centrifugal factor of centrifuge (5) is 2000~2200g, mud extraction moisture content≤70%, water outlet contains admittedly≤and 0.5%, solid-phase recovery 〉=90%.
2. the chemical enhanced solid-liquid separating method of waste liquid of drilling according to claim 1, it is characterized in that: the whole process time of staying is 21~28min, wherein dilution buffer stage 3~4min, take off the steady stage of reaction 6~8min, adsorption reaction stage 6~8min, flocculation reaction stage 6~8min.
CN 200910093856 2009-09-22 2009-09-22 Chemically reinforced solid-liquid separation method for well drilling waste liquid Active CN102019110B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104030494A (en) * 2014-06-30 2014-09-10 成都高普石油工程技术有限公司 Solid-liquid separation method of waste drilling liquid
CN104086023A (en) * 2014-06-30 2014-10-08 成都高普石油工程技术有限公司 Method conducive to reducing energy consumption for solid-liquid separation of drilling waste liquid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482459A (en) * 1983-04-27 1984-11-13 Newpark Waste Treatment Systems Inc. Continuous process for the reclamation of waste drilling fluids
CN1176859C (en) * 2002-05-17 2004-11-24 石油大学(北京) Coagulating and dewatering treatment method for waste drilling fluid
CN201276461Y (en) * 2008-10-15 2009-07-22 中国石油天然气集团公司 Integrated processing apparatus for well drilling wastewater and waste liquor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104030494A (en) * 2014-06-30 2014-09-10 成都高普石油工程技术有限公司 Solid-liquid separation method of waste drilling liquid
CN104086023A (en) * 2014-06-30 2014-10-08 成都高普石油工程技术有限公司 Method conducive to reducing energy consumption for solid-liquid separation of drilling waste liquid

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