CN1587099A - Method for treating awste water for oil field tertiary oil production prepared polymer solution - Google Patents
Method for treating awste water for oil field tertiary oil production prepared polymer solution Download PDFInfo
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- CN1587099A CN1587099A CN 200410071931 CN200410071931A CN1587099A CN 1587099 A CN1587099 A CN 1587099A CN 200410071931 CN200410071931 CN 200410071931 CN 200410071931 A CN200410071931 A CN 200410071931A CN 1587099 A CN1587099 A CN 1587099A
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Abstract
The treating process of oil field waste water for compounding tertiary oil production polymer solution includes aeration of waste water in aeration tank with air compressor to aerate from the bottom of the tank; filtering to eliminate three-valent iron ion and other harmful two-valent metal ion, with the three-valent iron being eliminated as ferric hydroxide with manganese sand; and treatment in oxygen eliminating apparatus. The treated waste water may be used directly in compounding polymer solution injected to stratum for displacing oil. The polymer solution compounded with the treated waste water has higher viscosity than that compounded with clear water and thus higher oil recovering rate. The present invention can eliminate environmental pollution caused by oil field waste water and make full use of water resource.
Description
Technical field
The invention belongs to a kind of raising oil recovery rate technology, particularly relate to a kind of treatment process of utilizing oil field output sewage to substitute the awste water for oil field tertiary oil production prepared polymer solution of clear water prepared polymer.
Background technology
China's overwhelming majority oil reservoir belongs to nonmarine deposit, the reservoir serious heterogeneity, and behind the waterflooding, because the fingering of injection water is serious, the water drive sweep efficiency is low, and development effectiveness is poor.According to the result to the land recovery ratio of waterflooding oil field demarcation of exploitation office of former China National Petroleum Corp. tissue, recovery ratio has only 35%.Under the situation that at present China's reserved resources is very in short supply, how as much as possible to remain in subterranean nearly 2/3rds resource be that pendulum in face of CNPC has strategic problem in extraction.Since " the Seventh Five-Year Plan ", tackling key problem research through the more than ten years has formed the raising recovery efficiency technique of taking as the leading factor with the clear water polymer flooding in China, and polymer flooding block yearly rate-oil production reaches more than 1,000 ten thousand tons, improve recovery ratio more than 8% than water drive, obtained obvious effects.And the most oil fields of China are because the Freshwater resources critical shortage, continuing to use sophisticated clear water technique of polymer flooding raising oil recovery rate is restricted, also there are very big problem in the sewage disposal of oil well output and discharging, and a problem the most serious that adopts the alternative clear water prepared polymer solution of sewage to be brought is exactly the degraded of the chemical composition of various complexity in the sewage to polymkeric substance, most importantly contains active substance ferrous ion (Fe in the sewage
2+) cause polymer solution viscosity to descend significantly.Simple sewage waterfall oxygen method can be a ferric ion with oxidation of divalent iron ion, respite Fe
2+Degraded to polymkeric substance, but subsurface deposit be a High Temperature High Pressure reducing environment, behind the oxidation of divalent iron ion in the sewage, still stay in the sewage with ferric form, be injected in the subsurface deposit, be reduced into ferrous ion again under reducing environment, secondary produces degraded (reducing the viscosity of polymers soln) to polymkeric substance in oil reservoir, so oil field output sewage has seriously restricted the application that polymer flooding improves recovery efficiency technique.
Activity substance content in the output sewage of oil field is at present: ferrous iron content is generally: 1-5mg/l; Hydrogen sulfide content is that 1-2mg/l and dissolved oxygen content are 0.
Summary of the invention
The present invention provides a kind of treatment process of utilizing the awste water for oil field tertiary oil production prepared polymer solution of the alternative clear water prepared polymer of oil field output sewage for the raising oil recovery rate for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology mainly may further comprise the steps:
Under normal temperature and pressure conditions
The first step, by oxygen exposing pool waterfall oxygen, ferrous ion is a ferric ion by oxidation transformation with the fresh sewage of oil field output, simultaneously hydrogen sulfide (the H that contains in the sewage
2S) taken away by air displacement;
In second step, the sewage of inflation waterfall oxygen is removed ferric ion (ferric ion is filtered with the ironic hydroxide form) again by filtration with manganese sand jar filtration unit;
In the 3rd step, filtered sewage is handled by the de-aerator plant deoxygenation again.
Advantage and positively effect that the present invention has are: adopt the sewage of this art breading, directly prepare new polymers solution, can obtain higher viscosity:
Back sewage preparation is handled in fresh sewage preparation
Polymer concentration 1500mg/l 10～15mPa.s 50～70mPa.s
Polymer solution made up by sewage was injected into the soltion viscosity in the stratum after employing was handled, than using the viscosity height of clear water prepared polymer solution in the stratum, reason is the secondary degraded not to take place with the polymers soln of handling back sewage preparation in oilbearing stratum, and the polymers soln of clear water preparation in the stratum with secondary to take place after sewage contact degrade, cause viscosity to reduce significantly.So, with handle the back sewage prepared polymer drive improve recovery ratio amplitude than the high 3-5 of clear water polymer flooding percentage point, laboratory experiment improves recovery ratio and reaches more than 17%.
With field test district, Gangdong, huge port is example, has carried out processing back sewage prepared polymer at this block and has driven individual well injection test test in place.The poly-original technical process in station is annotated in the Gangdong carried out optimizing transformation.Determined the technological line of waterfall oxygen.Can make the viscosity of polymers soln increase more than 3 times by waterfall oxygen.The compatibleness of the fresh sewage of new polymers and Gangdong of screening is good, directly prepares the 1000mg/L polymers soln with the sewage after the waterfall oxygen art breading, and well head viscosity has surpassed the conceptual design value, reaches more than the 50mPa..Carried out since the Gangdong handles back sewage prepared polymer individual well injection test test from March 28th, 2002, the oil pressure rising 8.0MPa of injection well 8-25-2, benefited well water descends nearly 10%.By in by the end of June, 2004, well group accumulative total increases more than 5000 ton of oil.Use the present invention and not only can improve recovery ratio, and can rationally utilize oil field output sewage, avoid the environmental issue brought because of sewage, also saved the sewage disposal expense, also solved the problem of present China most oil fields Freshwater resources critical shortage simultaneously.
Solve the sewage prepared polymer problem, guarantee the polymkeric substance viscosity in the sewage and stability after processing, be a n-th-trem relation n to improving China's oil-field development level, stablize east oilfields, guarantee the important topic of Sustainable development, be of great practical significance and long-range strategic importance.In state-owned 800,000,000 tons geologic reserve be suitable for carrying out polymer flooding or the flooding method relevant with polymeric system, therefore, the success of this technology has boundless promotion prospect.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, be described in detail as follows: under normal temperature and pressure conditions,
The first step; Fresh sewage is by a 40m
3The catalyzed oxidation jar fills air at the bottom of promptly using air compressor by jar in a large number in sewage, make the oxidation of divalent iron ion in the sewage become ferric ion, simultaneously the also oxidized inactivation of other active substance in the sewage; Hydrogen sulfide solution gas in the sewage is taken away by air.Air-blowing amount: for 40m
3The catalyzed oxidation jar, its air amount of charging into is 1m
3/ minute.
Second step: the sewage of inflation waterfall oxygen is removed ferric ion or other deleterious divalent-metal ion (calcium ion Ca by filtration unit
2+Or magnesium ion Mg
2+), ferric ion is with ironic hydroxide (Fe (OH) in the sewage
3) form is filtered by the manganese sand in the catalyzed oxidation jar.So-called catalyzed oxidation jar is the thick manganese sand of shop one deck 20-50 centimetre at the bottom of hay tank or gasing tank, reacts with promote the oxidation.
The 3rd step filtered sewage is handled by the de-aerator plant of being made up of nitrogen gas generator and supplementary unit again.
Mainly form " sewage waterfall gas deironing inactivation device " by above-mentioned three step process by catalyzed oxidation pond, air compressor, oxidation catalyst filter jar and de-aerator plant four parts.
Use by the sewage after above three step process, in the sewage prepared polymer flooding method, can directly prepare new polymers TS-65 type salt-resistant polymer; Can also be applied to prepare the salt-resistant polymer of other model, as salt-resistant polymer KYPAM-2 and association polymer AP-P4 etc.
The principle of whole technological process is that the first step is to be that ferric iron forms ironic hydroxide (Fe (OH) simultaneously with oxidation of divalent earlier
3), a spot of Fe (OH) is arranged
3Be filtered.Second step entered into second duct device through the sewage of the first step oxide treatment, and the oxidation catalyst filter device contains Fe (OH)
3The sewage of material enters the filtration with manganese sand jar and filters, and becomes the oxygen containing sewage of iron-free; The 3rd step deoxygenation, the sewage of process oxide treatment contains a certain amount of dissolved oxygen, and detection level adopts de-aerator plant to carry out deoxygenation more than 2mg/l.Supplementary unit is incorporated into the oxygen in the displacement sewage in the sewage with nitrogen, thereby reaches the purpose of deoxygenation.
Sewage after the processing can be directly used in prepared polymer solution, injects oil reservoir and carries out the displacement of reservoir oil.
The basic index of handling back sewage is: total iron content＜0.2mg/l; Hydrogen sulfide content is 0: dissolved oxygen content＜0.3mg/l.
With the viscosity retention ratio of sewage prepared polymer more than 90%.
Claims (1)
1. treatment process of utilizing oil field output sewage to substitute the awste water for oil field tertiary oil production prepared polymer solution of clear water prepared polymer mainly may further comprise the steps:
The first step, with the fresh sewage of oil field output by oxygen exposing pool waterfall oxygen;
In second step, the sewage of inflation waterfall oxygen is removed ferric ion again by filtration with manganese sand jar filtration unit;
In the 3rd step, filtered sewage is handled by de-aerator plant again;
More than the processing of three steps, all under normal temperature and pressure conditions, carry out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100719317A CN100488891C (en) | 2004-09-13 | 2004-09-13 | Method for treating waste water for oil field tertiary oil production prepared polymer solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100719317A CN100488891C (en) | 2004-09-13 | 2004-09-13 | Method for treating waste water for oil field tertiary oil production prepared polymer solution |
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| Publication Number | Publication Date |
|---|---|
| CN1587099A true CN1587099A (en) | 2005-03-02 |
| CN100488891C CN100488891C (en) | 2009-05-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445218C (en) * | 2005-12-31 | 2008-12-24 | 南开大学 | Method for treating oil-field waste-water refilling by catalytic oxygenation-desorption deaerization UV sterilization |
| CN102531227A (en) * | 2010-11-03 | 2012-07-04 | S.P.C.M.股份公司 | A process for treatment of produced water obtained from an enhanced oil recovery process using polymers |
| CN104033137A (en) * | 2013-03-06 | 2014-09-10 | 中国石油化工股份有限公司 | Method for improving fault block oil reservoir recovery efficiency by utilizing oilfield wastewater |
| CN105060544A (en) * | 2015-07-20 | 2015-11-18 | 中国海洋石油总公司 | Method for filtering sewage to remove iron on basis of manganese sand filter materials |
-
2004
- 2004-09-13 CN CNB2004100719317A patent/CN100488891C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445218C (en) * | 2005-12-31 | 2008-12-24 | 南开大学 | Method for treating oil-field waste-water refilling by catalytic oxygenation-desorption deaerization UV sterilization |
| CN102531227A (en) * | 2010-11-03 | 2012-07-04 | S.P.C.M.股份公司 | A process for treatment of produced water obtained from an enhanced oil recovery process using polymers |
| CN102531227B (en) * | 2010-11-03 | 2016-01-20 | S.P.C.M.股份公司 | Process by the method for the recovered water using the enhanced oil recovery process of polymkeric substance to obtain |
| CN104033137A (en) * | 2013-03-06 | 2014-09-10 | 中国石油化工股份有限公司 | Method for improving fault block oil reservoir recovery efficiency by utilizing oilfield wastewater |
| CN104033137B (en) * | 2013-03-06 | 2016-04-13 | 中国石油化工股份有限公司 | Oilfield sewage is utilized to improve fault block oil reservoir recovery ratio method |
| CN105060544A (en) * | 2015-07-20 | 2015-11-18 | 中国海洋石油总公司 | Method for filtering sewage to remove iron on basis of manganese sand filter materials |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100488891C (en) | 2009-05-20 |
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Effective date of registration: 20201217 Address after: No.16 ande Road, Dongcheng District, Beijing Patentee after: PetroChina Co.,Ltd. Address before: 300280 Dagang Oilfield No. three, Tianjin Patentee before: PetroChina Dagang Oilfield Production Technology Research Institute |