CN1370637A - Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field - Google Patents
Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field Download PDFInfo
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- CN1370637A CN1370637A CN02116554A CN02116554A CN1370637A CN 1370637 A CN1370637 A CN 1370637A CN 02116554 A CN02116554 A CN 02116554A CN 02116554 A CN02116554 A CN 02116554A CN 1370637 A CN1370637 A CN 1370637A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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Abstract
The harmless treating and resource utilizing process of waste salt-containing drilling slurry in oil field includes the following steps: replacement step for flocculating slurry with flocculent to destroy its colloid state, convert adsorbed salt ion free state in water solution and separate water from slurry; wsater washing and dewatering step for water washing slurry for 3-6 times before eliminating water solution to eliminate salt in slurry; desalting step combining reverse osmosis and climbing film evaporation to eliminate salt in water; salt recovering step to crystallize salt in concentrated salt solution with solar energy; and optional step to utilize desalted slurry in soil improvement.
Description
Invention field
The present invention relates to a kind of method of waste salt-containing drilling slurry in oil field harmless treatment and recycling.
Technical background
In petroleum industry, drilling well is to produce the requisite link of oil, prepares the proportion of drilling mud in drilling process according to the proportion of stratum mineral substance, is an inevitable process so produce discarded slurry in drilling process.Owing to contain a large amount of salt mineral in some stratum, so must dispose saturated saltwater mud when the configuration drilling mud, therefore essential the generation discarded saliferous mud and drilling well saliferous spare in drilling process.The salt component that contains of discarded saliferous mud and drilling well saliferous spare mainly contains following several: NaCl, Na
2SO
4, NaNO
3, KCl, K
2SO
4, KNO
3, MgCl
2, MgSO
4, Mg (NO
3)
2, CaCl
2, CaSO
4, Ca (NO
3)
2Deng material.The saliferous discarded slurry is present in the suction pit, and the discarded slurry volume of general a bite well is 200-300m
3, but saliferous discarded slurry and saliferous spare and well-drilling waste water lump together, makes the volume total amount reach 500-600m
3, the mixture in suction pit often exists and unchangeability in for a long time with fluid and semi-solid state.Because the saliferous discarded slurry is normal and the saliferous spare has the saltiness height, alkalescence is strong, also contains the characteristics of pollutents such as partial organic substances and oil, these materials bring severe contamination to environment.Be in particular in following two aspects: 1, to the pollution in soil, discarded slurry pond.2, as if heavy rains, the waste liquid in discarded slurry pond overflows, and the well site surrounding environment is produced pollute.The result who produce to pollute is in particular in following two aspects: (1), to the soil salinization.(2), organism and oil pollute water body generation on every side.Therefore, harmless treatment, the recycling to drilling well saliferous discarded slurry and salt-containing drilling spare is an environmental issue being badly in need of solution in petroleum industry.But up to now, this problem still there is not reasonable solution at home and abroad.
Processing to drilling well saliferous discarded slurry and drilling well saliferous spare both at home and abroad is started in the seventies, because the component difference of saliferous mud and saliferous spare, treatment process is also different, and its treatment process has two kinds, i.e. re-injection ground laxative remedy and solidification treatment method.Because the laxative remedy processing costs of re-injection ground is high, and solidification method is handled the muriate that can not seal well in discarded saliferous mud and the saliferous spare, therefore to the processing of saliferous discarded slurry and saliferous spare, does not still have better method at present.
China also launches the work of this respect in the eighties, and it mainly is the processing to the drilling well water mud, but still is one big blank to the processing of saliferous discarded slurry and saliferous spare.
The difficult point that drilling well saliferous discarded slurry and drilling well saliferous spare are handled mainly contains:
1, drilling well discarded slurry and well drilling detritus saltiness height, its concentration is up to 8-10%.
2, the salt in the discarded slurry its 2/3 be adsorbed state, whole mud is colloidal state, it is impossible directly salinity being taken off from mud.
3, adopt conventional method,, be difficult to directly it be handled as washing, electrodialysis, reverse osmosis, ion-exchange, evaporation.
4, entire treatment process operation in the open air is subjected to the restriction of its natural condition.
5, should miniaturization, in light weight in the configuration of whole plant, also to conveniently move.
At above-mentioned technological difficulties, launched the research of every element task, comprised basic test, the laboratory lab scale, on equipment, carry out processes such as pilot scale, finished harmless treatment and a whole set of technical process of recycling discarded saliferous mud of drilling well and drilling well saliferous spare.Reached every discharge index of national regulation.
Summary of the invention
Main purpose of the present invention is exactly harmless treatment and the recycling that solves drilling well saliferous discarded slurry and drilling well saliferous spare.
Method of the present invention may further comprise the steps:
(A) displacement step: the problem that solves salt ion absorption.Because the salt ion 2/3 in the drilling well saliferous discarded slurry is adsorbed state, whole mud is colloidal state, directly washes with water, can not wash salinity to come out from mud.The present invention adopts flocculation agent that mud is flocculated, and destroys its colloidal state, makes the salt ion of absorption change into free state, is present in the aqueous solution, and water in the mud and mud separation are opened.Adopting vacuum adsorption method that free-water is extracted out then goes.
(B) washing and dehydrating step: the mud of destroyed colloidal state is washed, made salts contg clearance in mud and the spare, remove moisture by for example means such as suction filtration, squeezing again up to more than 99%.
(C) desalination step in the aqueous solution: adopt reverse osmosis and multiple-effect climbing-film evaporation process combined except that the salinity in anhydrating.Because aqueous solution saltiness is up to 15% in vacuum suck and first and second time washing, minimumly reach 2%, directly adopt reverse osmosis to be difficult to directly handle, this a part of salt solution is adopted the multiple-effect climbing-film evaporation, salts contg is less than or equal to 2% salt solution and handles with reverse osmosis.The strong brine of deviating from this reverse osmosis is sent into and is continued desalination in the climbing-film evaporator.Again the fresh water of reverse osmosis and climbing-film evaporation recovery is used for the recycle of washing process flow process.
(D) adopt the sun power concentration and crystallization process being concentrated into saturated strong brine in the climbing-film evaporator, according to NaCl, KCl, K
2SO
4, K
2NO
3Deng the ctystallizing point difference, reclaim NaCl, KCl, K
2SO
4, KNO
3Deng.
(E) optional mud after the desalination and spare are carried out acid-base integration, add organic matter, humic acid, organic nutrient etc., carry out the soil modification, make it can reach the purpose of direct second ploughing.
Below in conjunction with accompanying drawing the preferred embodiments of the invention are described in more detail.
Fig. 1 is a process flow sheet of the present invention.
1, composite flocculation: adopt two kinds of efficient flocculant polyacrylamides and polymerization chlorine through screening Change aluminium, make it destroy the mud colloidal state, make the salt ion of absorption be transformed into free salt ion, And water and mud separated.
2, vacuum suction: by vavuum pump mud filter cloth lower room is vacuumized, take out The free water of saliferous.
3, washing: with fresh water mud is washed, until the salt in the mud is removed to 280mg/L Below till. In this process, the number of times of washing is generally 3-6 time, preferred 4 or 5 times. Also adopting the method that vacuumizes that washing salt solution is extracted out in the process of washing goes.
4, collecting tank 1: the high concentration of flocculate with for the first time in this collection, releasing for the second time Salt solution. Brine strength is at 2-12%.
5, collecting tank 2: the washing salt solution more than this collects for the third time. Brine strength is at 800mg/L-5000mg/L.
6, climbing-film evaporation: the 2-12% salt solution that collecting tank 1 is collected carries out climbing-film evaporation. The fresh water that reclaims in the climbing-film evaporation process is used for flocculation and washing, fresh water is taked recycling.
7, counter-infiltration: the 800-5000mg/L salt solution that collecting tank 2 is collected carries out counter-infiltration, The fresh water that counter-infiltration is reclaimed is used for flocculation and washing, fresh water is taked recycling. Counter-infiltration is taken off The strong brine that removes is recovered in the climbing-film evaporation, continues concentrating and desalinating and reclaims fresh water.
8, crystallization is reclaimed: the saturated strong brine that climbing-film evaporation is reclaimed adopts the solar energy condensing crystallizing, reclaims NaCl, KCl, K2SO
4、KNO
3Deng.
9, mud modification: add soil modifier in the mud after desalination, humic acid, organic Nutrient carries out soil modification, can enough reach the purpose of direct second ploughing.
Wherein polyacrylamide (molecular weight is more than 1,200 ten thousand) is mixed with about 0.1% solution in water.Dissolving needs 30 minutes approximately.For accelerate dissolution, in the dissolved process, need abundant stirring.Polymerize aluminum chloride is mixed with about 5% solution in water.At first in saliferous mud and saliferous spare, add the polyacrylamide solution for preparing, its adding proportion is 8-12%, and is preferred 10%, adds the polymerize aluminum chloride aqueous solution for preparing then in saliferous mud and saliferous spare, its adding proportion is 3-6%, preferred 5%.Two kinds of flocculation agents fully stir after adding, and its stirring velocity is controlled at 13-16 rev/min, its churning time approximate number minute, for example 3 minutes.So far, whole flocculation separation process is finished.
Flocculation vacuumizes and washs the vacuum tightness that vacuumizes and generally is controlled at 0.2-0.4 normal atmosphere, and the climbing-film evaporation vacuum degree control is at the 0.1-0.3 normal atmosphere.
The climbing-film evaporation heating and temperature control is at about about 360 ℃.
The soil modifier that is used for the mud modification for example is CaSO
4, the ratio of adding in mud is about 5%.
Humic acid for example is the peat composed of rotten mosses, and its adding proportion is 3%.
Organic nutrient for example is the green high-efficient fertilizer, and its adding proportion is 4%.
By using the present invention, obtained following technical indicator:
1, discharge water: BOD=10mg/L, COD=30mg/L, SS=5mg/L, salt ion total concn=800mg/L, Cl
-=280mg/L.Discharge water reaches national grade one discharge standard.(national surface water emission standard: the salt ion total concn is less than 1500mg/L, Cl
-Less than 300mg/L).
2, discarded slurry is handled back saltiness: 260mg/L.
3, mud potential of hydrogen after treatment is 6.8-8.2.
Economic benefit of the present invention and social environment benefit
1, economic benefit
In the China's oil industry, interim expropriation of land is 7 mu when well-digging, stays 4 mu of soils after the finishing drilling and is requisition.The well site area actual 1.8 mu just enough, if after we carry out harmless treatment to saliferous discarded slurry and saliferous spare, just can reduce 2.2 mu of expropriations of land in average each well site.Every mu of land expropriation cost is 100,000 yuan, only calculates land expropriation cost, just can save 220,000 yuan, in addition, also will compensate peasant's young crops expense.With the Jianghan Oil-field is example, and 60 mouthfuls of annual newly-increased well-diggings are calculated with this, can economize the land resource every year 132 mu, saves 1,320 ten thousand yuan of economic benefits (reparations of young crops expense does not also count), and visible economic benefit is very remarkable.
2, social environment benefit
(1) saving a large amount of land resourcess, is example with the Jianghan Oil-field, can save 132 mu of expropriations of land every year.
(2) reduce the soil salinization.
(3) minimizing is to the pollution of water resources.
Embodiment
1, gets 10 tons of drilling well saliferous discarded slurry and saliferous spares.And add 4 tons of water and dilute.Being injected into volume with spiral pump is in 10 tons the flocculation jar.
2, the polyacrylamide of preparation 0.1% is 1 ton, prepares 0.5 ton of 5% polymerize aluminum chloride.
3,1,2 flocculation agents that prepare are all joined in 10 tons of mud, stirred 3 minutes, stirring velocity is controlled at 15 rev/mins.
4, the mud after will flocculating dewaters with belt squeezing vacuum dewatering apparatus, 0.3 normal atmosphere of vacuum degree control, after the water of deviating from is collected with the strong brine holding tank, carry out four washings again, the strong brine of first and second time washing is collected the strong brine hold-up vessel, third and fourth time washing water are collected the light salt brine hold-up vessel.Salt ionic concentration after the mud washing is 260mg/L.
5, the mud after the desalination is squeezed, the mud cake after the squeezing is carried out modification, (1) addition of C aSO
4500 kilograms, 300 kilograms of (2) additive peats composed of rotten mosses, (3) organic nutrient: add 400 kilograms of green high-efficient fertilizers.
6, the light salt brine hold-up vessel is injected in the reverse osmosis unit with pump, carries out reverse osmosis, and the strong brine that reverse osmosis is reclaimed is injected in the climbing-film evaporator with pump, and the fresh water of recovery discharges.
7, the strong brine with the strong brine hold-up vessel is injected in the climbing-film evaporator with pump, and vacuum degree control is at 0.2 normal atmosphere.Carry out climbing-film evaporation, the evaporation heating and temperature control is at 360 ℃, and the concentration that moisture evaporated is controlled at the strong brine of recovery is about 30%.The fresh water that evaporation is reclaimed discharges.
8, about 30% saturated strong brine is carried out condensing crystal with sun power, isolate NaCl, KCl, K
2SO
4, KNO
3
Claims (6)
1, a kind of treatment process of waste salt-containing drilling slurry in oil field may further comprise the steps:
(A) displacement step: comprise and adopt flocculation agent that mud is flocculated, destroy its colloidal state, make the salt ion of absorption change into free state and be present in the aqueous solution, and water in the mud and mud separation are opened;
(B) washing and dehydrating step: comprise the mud of above-mentioned destroyed colloidal state is washed three to six times, remove the aqueous solution again, to remove the salts contg in the mud;
(C) adopt reverse osmosis and multiple-effect climbing-film evaporation process combined to remove salinity in anhydrating: to comprise the climbing-film evaporation that the aqueous solution employing multiple-effect that removes in first and second time washing of water that saltiness is removed and step (B) combines in the step 2% or more (A), salts contg being less than or equal to 2% salt solution handles with reverse osmosis, the strong brine that reverse osmosis is deviate from is sent into and is continued desalination in the climbing-film evaporator again, and the fresh water that reverse osmosis and climbing-film evaporation reclaim can be used for circulation or discharging in the washing process;
(D) adopt the sun power concentration and crystallization process being concentrated into saturated strong brine in the climbing-film evaporator, reclaim various salinities;
(E) optional mud after the desalination and spare are carried out acid-base integration, add organic matter, humic acid, organic nutrient, carry out the soil modification, make it can reach the purpose of direct second ploughing.
2,, be characterised in that flocculation agent is the binding substances of polyacrylamide and polymerize aluminum chloride according to the method for claim 1.
3, according to the method for claim 2, the adding proportion that is characterised in that polyacrylamide is 10%, calculate by 0.1% aqueous solution based on the polyacrylamide of the weight of handled saliferous mud, the adding proportion of polymerize aluminum chloride is 5%, calculates by 5% the aqueous solution based on the polymerize aluminum chloride of the weight of handled saliferous mud.
4,, be characterised in that flocculation carried out 3 minutes under 13-16 rev/min stirring velocity according to claim 1,2 or 3 method.
5,, be characterised in that and adopt belt squeezing vacuum dewatering apparatus to wash and dehydrating step according to the method for claim 1.
6, according to the method for claim 1, be characterised in that climbing-film evaporation vacuum tightness be the 0.1-0.3 normal atmosphere, the Heating temperature of climbing-film evaporation is 360 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165548A CN1156345C (en) | 2002-04-08 | 2002-04-08 | Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165548A CN1156345C (en) | 2002-04-08 | 2002-04-08 | Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field |
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| Publication Number | Publication Date |
|---|---|
| CN1370637A true CN1370637A (en) | 2002-09-25 |
| CN1156345C CN1156345C (en) | 2004-07-07 |
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|---|---|---|---|
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418647C (en) * | 2006-09-30 | 2008-09-17 | 廖中健 | Method for treating waste mud of drilling well by harmless process |
| CN101186401B (en) * | 2007-12-18 | 2010-06-02 | 黄大军 | Oil mud harmless treatment and resource reclamation method |
| CN101830614A (en) * | 2010-04-15 | 2010-09-15 | 中国石油集团川庆钻探工程有限公司 | Biological treatment method for waste mud in petroleum and natural gas exploration drilling operation |
| CN102285699A (en) * | 2011-06-17 | 2011-12-21 | 冯静 | Method for preparing salt by atomizing seawater with natural energy source and collecting distilled water |
| CN102285701A (en) * | 2011-06-17 | 2011-12-21 | 冯静 | Method for preparing freshwater by applying solar seawater desalination plant arranged on sea |
| CN102515455A (en) * | 2011-11-24 | 2012-06-27 | 淮海工学院 | Method for dehydrating and desalting sea sludge |
| CN102718341A (en) * | 2012-06-28 | 2012-10-10 | 秦广山 | Centrifugal non-landing waste drilling fluid innocent treatment technology |
| CN102992528A (en) * | 2011-09-15 | 2013-03-27 | 四川仁智石化科技有限责任公司 | Oil and gas field high-salt-content waste water integral processing method |
| CN103232147A (en) * | 2013-05-21 | 2013-08-07 | 唐山三友化工股份有限公司 | Method for improving primary salty mud washing ability |
| CN104169517A (en) * | 2011-12-22 | 2014-11-26 | 水质标准公司（Mi) | Method and control devices for production of consistent water quality from membrane-based water treatment for use in improved hydrocarbon recovery operations |
| CN106561334A (en) * | 2016-11-08 | 2017-04-19 | 中国石油大学(北京) | Well drilling solid-phase waste disposal composition and application thereof |
| CN107502314A (en) * | 2017-07-13 | 2017-12-22 | 中海油能源发展股份有限公司 | It is a kind of to aggravate salt with cleaning using completion prepared by waste liquid of drilling |
| CN109162656A (en) * | 2018-09-07 | 2019-01-08 | 洲际海峡能源科技有限公司 | A kind of technology operation method using exhaustion oil-gas reservoir disposal of solid waste |
-
2002
- 2002-04-08 CN CNB021165548A patent/CN1156345C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418647C (en) * | 2006-09-30 | 2008-09-17 | 廖中健 | Method for treating waste mud of drilling well by harmless process |
| CN101186401B (en) * | 2007-12-18 | 2010-06-02 | 黄大军 | Oil mud harmless treatment and resource reclamation method |
| CN101830614A (en) * | 2010-04-15 | 2010-09-15 | 中国石油集团川庆钻探工程有限公司 | Biological treatment method for waste mud in petroleum and natural gas exploration drilling operation |
| CN102285701B (en) * | 2011-06-17 | 2012-10-31 | 冯静 | Method for preparing freshwater by applying solar seawater desalination plant arranged on sea |
| CN102285701A (en) * | 2011-06-17 | 2011-12-21 | 冯静 | Method for preparing freshwater by applying solar seawater desalination plant arranged on sea |
| CN102285699B (en) * | 2011-06-17 | 2012-10-10 | 冯静 | Method for preparing salt by atomizing seawater with natural energy source and collecting distilled water |
| CN102285699A (en) * | 2011-06-17 | 2011-12-21 | 冯静 | Method for preparing salt by atomizing seawater with natural energy source and collecting distilled water |
| CN102992528A (en) * | 2011-09-15 | 2013-03-27 | 四川仁智石化科技有限责任公司 | Oil and gas field high-salt-content waste water integral processing method |
| CN102515455A (en) * | 2011-11-24 | 2012-06-27 | 淮海工学院 | Method for dehydrating and desalting sea sludge |
| CN102515455B (en) * | 2011-11-24 | 2013-05-08 | 淮海工学院 | Method for dehydrating and desalting sea sludge |
| CN104169517A (en) * | 2011-12-22 | 2014-11-26 | 水质标准公司（Mi) | Method and control devices for production of consistent water quality from membrane-based water treatment for use in improved hydrocarbon recovery operations |
| CN102718341A (en) * | 2012-06-28 | 2012-10-10 | 秦广山 | Centrifugal non-landing waste drilling fluid innocent treatment technology |
| CN103232147A (en) * | 2013-05-21 | 2013-08-07 | 唐山三友化工股份有限公司 | Method for improving primary salty mud washing ability |
| CN106561334A (en) * | 2016-11-08 | 2017-04-19 | 中国石油大学(北京) | Well drilling solid-phase waste disposal composition and application thereof |
| CN107502314A (en) * | 2017-07-13 | 2017-12-22 | 中海油能源发展股份有限公司 | It is a kind of to aggravate salt with cleaning using completion prepared by waste liquid of drilling |
| CN109162656A (en) * | 2018-09-07 | 2019-01-08 | 洲际海峡能源科技有限公司 | A kind of technology operation method using exhaustion oil-gas reservoir disposal of solid waste |
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| CN1156345C (en) | 2004-07-07 |
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