CN1415690A - Method for preparing super molecular weight polymer flooding by using sewage produced by the oil field - Google Patents
Method for preparing super molecular weight polymer flooding by using sewage produced by the oil field Download PDFInfo
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- CN1415690A CN1415690A CN 01136858 CN01136858A CN1415690A CN 1415690 A CN1415690 A CN 1415690A CN 01136858 CN01136858 CN 01136858 CN 01136858 A CN01136858 A CN 01136858A CN 1415690 A CN1415690 A CN 1415690A
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Abstract
A process for using the sewage generated by oil field to prepare the ultrahigh-molecular weight (22-32 millions) polymer as oil-displacing agent is disclosed. Said polymer may be CYHPAM or LHHPAM with 1000-1200 mg/L of concentration. Its advantage is high recovery rate of oil.
Description
Technical field
The present invention relates to the field polymers technology of reservoir sweep, relate in particular to a kind of method of utilizing oil field output sewage preparing super molecular weight polymer flooding.
Background technology
Daqing oil field is from nineteen ninety-five, carried out on the oil field and utilized polydispersity polymer in the clear water preparation to drive the work of applying of technology.By the end of at present, polydispersity polymer drives and has obtained very significantly oil increasing precipitation effect in the clear water preparation.Middle polydispersity polymer by clear water preparation drives recovery ratio is improved on the basis of water drive more than 10%, and a ton polymkeric substance increases oil and reaches more than 100 tons.Simultaneously, Daqing oil field year the scale of polymer injection dry powder reached 60,000 tons level, the industrialization polymer flooding all needs to replenish 6,000 ten thousand side's clear water every year, and oil field output sewage can not balance be recycled into oil reservoir, redundance can only efflux.Do the waste that can cause water resources on the one hand like this, increase the oilfield operations cost, can cause environmental pollution on the other hand.Therefore, utilize the problem of oil field output sewage prepared polymer just to seem more and more important.
Its physical and chemical index of middle polydispersity polymer of using with the clear water prepared polymer requires as shown in table 1, and the oil field is monitored the polymeric articles that injects by this cover index.
Polydispersity polymer physical and chemical index requirement in the table 1
| Molecular weight (* 10 4) | 1200-1600 | |
| Screen factor | 20-24 | |
| Residual monomer (Wt%) | ≤0.05 | |
| Filterable agent | ≤15 | |
| Water-insoluble (Wt%) | ≤0.2 | |
| Dissolution rate (h) | ≤2 | |
| Solid content (Wt%) | ≥88 | |
| Intrinsic viscosity (dl/g) | 17.5-21.2 | |
| Degree of hydrolysis (mol%) | 23-27 | |
| Granularity (%) | ≥1.00mm | ≤5 |
| ≤0.20mm | ≤5 | |
| Viscosity (mPas) | 40-45 | |
If the sewage with the oil field output substitutes polydispersity polymer in the clear water preparation, then can save great amount of water resources, also solved the environmental pollution that causes because of the large amount of sewage discharging simultaneously.But find through experiment, the system viscosity difference of the middle polydispersity polymer of these two kinds of different quality preparation same concentrations is bigger, and increase gradually along with polymer solution concentration, its gap also increases (seeing Table 2) gradually, for example, the clear water compound concentration is the middle polydispersity polymer solution of 1000mg/L, and viscosity is 47.1, and adopting the sewage preparation will reach identical viscosity, its concentration will be above 1400mg/L.
The sticking dense relation of polydispersity polymer in table 2 clear water and the sewage preparation
| Concentration (mg/L) | 200 | ?400 | ?600 | ?800 | ?1000 | ?1200 | ?1400 |
| Clear water | 6.1 | ?11.2 | ?20.0 | ?31.9 | ?47.1 | ?67.5 | |
| Sewage | 5.1 | ?8.7 | ?13.1 | ?19.1 | ?26.3 | ?34.9 | ?44.4 |
Because the difference of system viscosity has direct influence to oil displacement efficiency, by experiment given below relatively, can clearly be seen that this point:
(1) experiment condition
Sewage is the not sudden and violent oxygen sewage of six factories of recovering the oil.The simulation oil viscosity is 9.3mPas.Porous media model is three layers of artificial core of heterogeneous body, and composition is a quartz sand, and cementing matter is a Resins, epoxy, air about 900 * 10
-3μ m
2, the heterogeneous body variation coefficient is 0.72.The sectional area of core is about 10.0cm
2, length is about 30cm.
The a experiment: polymer concentration 1000mg/L, configuration water is clear water, work viscosity is 24.2mPas
The b experiment: polymer concentration 1000mg/L, configuration water is sewage, work viscosity is 15.3mPas
The c experiment: polymer concentration 1550mg/L, configuration water is sewage, work viscosity is 24.2mPas
Above-mentioned work viscosity all refers to the viscosity after borehole is sheared at the bottom of the simulation well under the same conditions.
(2) experimentation
The whole process of core oil displacement experiment is: core is found time, make its vacuum tightness reach 0.098MPa, saturation water, saturated oil carries out water drive, moisturely reach at 98% o'clock, finish water drive, then carry out polymer flooding, during injection of polymer solution slug 0.38PV, water drive is to moisture 98%, and whole oil displacement experiment finishes.
(3) experimental result and analysis
The displacement of reservoir oil of three kinds of different situations the results are shown in table 3.As can be seen from the table, the concentration of sewage preparation is the polymers soln of 1000mg/L, and its oil displacement efficiency hangs down 2.6 percentage points than the clear water polymers soln with concentration.Therefore, as maintenance and the same concentration of clear water system, the oil displacement efficiency of sewage prepared polymer system is with obvious variation.Make that the viscosity of the viscosity of sewage prepared polymer system and clear water prepared polymer system is suitable if improve polymer concentration, can obtain close oil displacement efficiency.
Table 3 core oil displacement experiment result
| The displacement type | Polymer concentration (mg/L) | Work viscosity (mPas) | Inject PV number (PV) | Waterflood recovery efficiency factor (%) | Improve recovery ratio (percentage point) | The poly-recovery ratio (%) of driving |
| A. clear water is poly-drives | 1000 | 24.2 | 0.38 | 41.6 | 11.9 | 53.5 |
| B. sewage is poly-drives | 1000 | 15.3 | 0.38 | 41.2 | 9.3 | 50.5 |
| C. sewage is poly-drives | 1550 | 24.2 | 0.38 | 39.2 | 12.6 | 51.8 |
But, because the concentration increase rate is bigger, polymer loading is obviously increased, the cost that polydispersity polymer drives in making the most at last increases substantially.For example, if consider that molecular weight polymerized substrate concentration is 1000mg/L in the clear water preparation, when consumption is 570mg/LPV, the recovery ratio improvement value is that 12 percentage point, ton polymkeric substance increase 120 tons of oil, so, the sewage condition is issued to the polymer concentration of identical recovery ratio improvement value then for 1550mg/L, consumption are that 884mg/LPV, ton polymkeric substance increase 77 tons of oil, and the ton polymkeric substance increases oil and reduced 43 tons.
From above experimental studies results, reach the clear water polymer flooding if guarantee the effect of sewage polymer flooding, then need to increase the concentration of polymkeric substance, make the economic benefit of sewage polymer flooding well below the clear water polymer flooding.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing oil field output sewage preparing super molecular weight polymer flooding, this method can the conserve water resource, improves environmental pollution and improves oil displacement efficiency.
The technical scheme that the present invention is used for achieving the above object is:
Adopt sewage preparation 2200-3200 ten thousand extra high molecular polymers, this extra high molecular polymer can be that chemical plant, Chaoyang, Beijing produces, the product code name is that extra high molecular polymer or the Daqing Refinery of CYHPAM produced, the product code name is the extra high molecular polymer of LHHPAM, compound concentration is 1000-1100mg/L, rock pore volume: inject long-pending=100: 38 (promptly the injecting 0.38PV) of liquid.
Embodiment
The molecular weight of the extra high molecular polymer that the present invention adopts is more than 2,200 ten thousand, and it is that 3,200 ten thousand extra high molecular polymer sample physicochemical properties detect index that table 4 has been listed molecular weight.
Table 4 extra high molecular polymer physicochemical property
| Molecular weight (* 10 4) | 3284 | |
| Screen factor | 58.6 | |
| Residual monomer (Wt%) | 0.119 | |
| Filterable agent | ＞3.0 | |
| Water-insoluble (Wt%) | 0.081 | |
| Dissolution rate (h) | ＜2 | |
| Solid content (Wt%) | 91.14 | |
| Intrinsic viscosity (dl/g) | 34.11 | |
| Degree of hydrolysis (mol%) | 26.8 | |
| Granularity (%) | ≥1.00mm | 1.4 |
| ≤0.20mm | 7.3 | |
| Viscosity (mPas) | 79.0 | |
It can be seen from the table, utilize the polymers soln of clear water preparation commodity concentration for 1000mg/L, its viscosity is 79.0mPas, screen factor 58.6, degree of hydrolysis 26.8mol%, no more than 2 hours of dissolution time.Compare with middle polydispersity polymer, clear superiority arranged on several leading indicators such as viscosity, screen factor, other several aspect with middle polydispersity polymer do not have significant difference.
Utilize the present invention can obtain higher system viscosity, compare with polydispersity polymer in the clear water preparation, system viscosity is significantly improved, and is as shown in table 5.If after considering that the polymeric system of clear water preparation enters the stratum and local water contacts, system work viscosity will descend to some extent, and the polymkeric substance of sewage preparation enter the stratum after system viscosity obvious change would not be arranged, therefore, the two work viscosity in the stratum will be more approaching, even stratum of the present invention work viscosity will be higher than the middle polydispersity polymer of clear water preparation.
Table 5 extra high molecular polymer glues dense relation
| Polymer type | Preparation water | Concentration (mg/L) | ||||||
| 200 | 400 | 600 | 800 | 1000 | 1200 | 1400 | ||
| Middle Molecularly Imprinted Polymer | Clear water | 6.1 | 11.2 | 20.0 | 31.9 | 47.1 | 67.5 | |
| Sewage | 5.1 | 8.7 | 13.1 | 19.1 | 26.3 | 34.9 | 44.4 | |
| Extra high molecular polymer | Clear water | 6.8 | 20.1 | 37.2 | 61.3 | 89.6 | ||
| Sewage | 3.3 | 9.6 | 18.7 | 30.2 | 43.3 | 58.1 | 72.3 | |
By following comparative example, positively effect of the present invention as can be seen.
(1) experiment condition
Sewage is the not sudden and violent oxygen sewage of six factories of recovering the oil, and the simulation oil viscosity is 9.3mPas, and porous media model is three layers of artificial core of heterogeneous body, and composition is a quartz sand, and cementing matter is a Resins, epoxy.Air about 900 * 10
-3μ m
2, V
kBe 0.72.The sectional area of core is about 20.0cm
2, length is about 30cm.
Experiment a: polymkeric substance (middle molecular weight) concentration is 1000mg/L, and preparation water is clear water,
Work viscosity is 24.2mPas.
Experiment b: polymkeric substance (ultra-high molecular weight) concentration is 1000mg/L, and preparation water is sewage,
Work viscosity is 24.5mPas.
Experiment c: polymkeric substance (ultra-high molecular weight) concentration is 1100mg/L, and preparation water is sewage,
Work viscosity is 25.8mPas.
(2) experimentation
Core is found time, and makes its vacuum tightness reach 0.098MPa, saturated local water, and saturated oil carries out water drive, moisturely reaches 98% when above, finishes water drive, then carries out polymer flooding, moisturely reaches 98% when above, whole oil displacement experiment end.
(3) experimental data and interpretation of result
Table 6 has been listed the oil displacement experiment result of three kinds of different situations.
Table 6 core oil displacement experiment result
| The displacement type | Polymericular weight (ten thousand) | Polymer concentration mg/L | System viscosity mPa.s | Inject PV number (PV) | Waterflood recovery efficiency factor (%) | Improve recovery ratio (%) | The poly-recovery ratio (%) of driving |
| The A clear water is poly-to be driven | 1500 | ?1000 | ?24.2 | ?0.38 | ?41.6 | ?11.9 | ?53.5 |
| B sewage is poly-to be driven | 3200 | ?1000 | ?24.5 | ?0.38 | ?42.6 | ?12.7 | ?55.3 |
| C sewage is poly-to be driven | 3200 | ?1100 | ?25.8 | ?0.38 | ?42.3 | ?13.4 | ?55.7 |
As can be seen from the table, under the same polymer concentration conditions, the recovery ratio improvement value of molecular weight polymerized objects system is approaching in recovery ratio improvement value of the present invention and the clear water preparation, and promptly the former oil displacement efficiency is not less than the latter.Because the reduction of polymer concentration and consumption, the economic benefit of sewage preparing super molecular weight polymer flooding will be better than the economic benefit that polydispersity polymer drives in the sewage preparation.
Claims (2)
1, a kind of method of utilizing oil field output sewage preparing super molecular weight polymer flooding is characterized in that the molecular weight of polymkeric substance is 2200-3200 ten thousand, and compound concentration is 1000-1200mg/L, rock pore volume: inject liquid long-pending=100: 38.
2, the method for utilizing oil field output sewage preparing super molecular weight polymer flooding according to claim 1, it is characterized in that, described extra high molecular polymer can be that chemical plant, Chaoyang, Beijing produces, the product code name is that extra high molecular polymer or the Daqing Refinery of CYHPAM produced, and the product code name is the extra high molecular polymer of LHHPAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01136858 CN1415690A (en) | 2001-10-30 | 2001-10-30 | Method for preparing super molecular weight polymer flooding by using sewage produced by the oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01136858 CN1415690A (en) | 2001-10-30 | 2001-10-30 | Method for preparing super molecular weight polymer flooding by using sewage produced by the oil field |
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|---|---|
| CN1415690A true CN1415690A (en) | 2003-05-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424024C (en) * | 2005-12-23 | 2008-10-08 | 南开大学 | Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity |
| CN102911655A (en) * | 2012-10-30 | 2013-02-06 | 中国石油化工股份有限公司 | Method for preparing polymer injection liquid by utilizing polymer-bearing wastewater and capable of improving oil displacement viscosity and oil well recovery efficiency |
-
2001
- 2001-10-30 CN CN 01136858 patent/CN1415690A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424024C (en) * | 2005-12-23 | 2008-10-08 | 南开大学 | Photochemical oxidation method for increasing oilfield sewage prepared polymer solution viscosity |
| CN102911655A (en) * | 2012-10-30 | 2013-02-06 | 中国石油化工股份有限公司 | Method for preparing polymer injection liquid by utilizing polymer-bearing wastewater and capable of improving oil displacement viscosity and oil well recovery efficiency |
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