CN100356034C - Technology for modifying treatment of residual polymer in petroleum extrating polymer displacement proceture - Google Patents
Technology for modifying treatment of residual polymer in petroleum extrating polymer displacement proceture Download PDFInfo
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- CN100356034C CN100356034C CNB03151071XA CN03151071A CN100356034C CN 100356034 C CN100356034 C CN 100356034C CN B03151071X A CNB03151071X A CN B03151071XA CN 03151071 A CN03151071 A CN 03151071A CN 100356034 C CN100356034 C CN 100356034C
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- flocculant
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- oil
- stoste
- water
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Abstract
The present invention relates to modified processing technology for storing polymers in the process of petroleum exploitation displacement. A flocculating agent is added into a petroleum layer, and thereby, the crosslinking for the polymers stored in the petroleum layer is carried out to modify the polymers, and dispersal gel having a particle-shaped structure is formed so as to enhance the petroleum displacement effect of the polymers. The technology of the present invention can prolong the time limit of increase in yield of an oilfield. After the petroleum displacement of the polymers is finished, the flocculating agent in the present invention is added. More than 2 % of petroleum reserves is continuously exploited, namely that yield is more than 2% than that of the original polymer petroleum displacement, and the cost is one third to one half of the cost of the original injection polymers, and furthermore, the present invention has the advantages of simple technology and easy injection.
Description
Technical field
The present invention relates to a kind of oil exploitation technology, relate in particular to the poly-modification processing method that retains polymer in the process that drives of a kind of oil exploitation.
Background technology
In oil exploitation, utilize polymer displacement of reservoir oil to improve the technology of oil recovery, extensive use at home and abroad.Especially in China, original oil zone adopts the oil year produced quantity of this technology to surpass 1,000 ten thousand tons at present, can improve recovery ratio 6-10% than water drive.China's use scale is bigger than external, and effect is also than good abroad.But utilize the effect of polymer displacement of reservoir oil also limited, when the period of validity of polymer displacement of reservoir oil finishes, the moveable oil reserves that 10-20% is still arranged in the oil reservoir are not by extraction, oil reservoir will be shut, simultaneously, inject the polymer of oil reservoir, will together go out of use, to together go out of use, cause the loss and the waste of resource and goods and materials.
Summary of the invention
Purpose of the present invention is in order further to improve the utilization rate of the polymer that injects oil reservoir, further to improve the recovery ratio of oil, providing a kind of oil exploitation the poly-modification processing method that retains polymer in the process that drives.
The technical measures that the present invention taked are: the poly-modification processing method that retains polymer in the process that drives of a kind of oil exploitation, be characterized in, in oil reservoir, add flocculant, make it and remain in polymer in the oil reservoir and take place crosslinked and make polymer modification, formation has the dispersion gel of granular texture, to improve the oil displacement efficiency of polymer, concrete steps are as follows:
The preparation of step 1, flocculant stoste:
Get the citric acid of 20-50 weight portion, the aluminium chloride of 10-30 weight portion, the iron chloride on 2-5 weight portion ground and the water of 35-65 weight portion and be hybridly prepared into flocculant stoste;
The acid-base value of step 2, adjusting flocculant stoste;
In step 1, add appropriate alkaline liquor in the gained flocculant stoste, regulate its pH value and be 6-8;
Step 3, preparation flocculant inject water:
According to the content of the polymer in the oil reservoir extraction liquid of flocculant to be added, add step 2 gained flocculant stoste to injecting water according to a certain percentage, be mixed with flocculant and inject water;
Step 4, flocculant injected water inject oil reservoir:
Step 3 gained flocculant is injected water under uniform temperature and pressure, inject oil reservoir, make itself and the polymer that remains in the oil reservoir take place crosslinked and modification.
In described step 3, press the flocculant stoste of the polymer adding 0.01-0.1 weight portion of 1 weight portion and calculate the amount that needs to add flocculant stoste, in view of the above flocculant stoste is splashed into then and inject water, the water that is mixed with 1000 weight portions contains the flocculant injection water of 0.01-0.03 weight portion flocculant stoste.
In described step 4, the temperature that the flocculant of described injection oil reservoir injects water is controlled at 0-30 ℃, and pressure is controlled at 5-20MPa.
Described flocculant adds oil reservoir when polymer displacement of reservoir oil closes to an end.
Described flocculant alternately adds oil reservoir with polymer in the polymer displacement of reservoir oil process.The poly-advantage of driving the modification processing method that retains polymer in the process of oil exploitation of the present invention is:
1, can prolong the volume increase time limit in oil field.After polymer displacement of reservoir oil finished, oil reservoir was adopted when not fuel-displaced, adopt technical finesse of the present invention after, polymer generation modification forms the dispersion gel with granular texture, enters the oil field, can stop up high-capacity channel, to sweep pasta long-pending thereby enlarge.Compare with no cross-linked polymer, except that increasing displacing phase viscosity, also can reduce the permeability of high-permeability pay, increase residual resistive, improve oil displacement efficiency.Continue the petroleum reserves of exploitation more than 2%, promptly also will increase production more than 20% than the effect of the original copolymer displacement of reservoir oil.
2, the polymer that is modified no longer is the effect by the adjusting mobility, but has the effect that improves reservoir permeability difference simultaneously, with the mechanism different with polymer displacement of reservoir oil, continues the displacement of reservoir oil in oil reservoir.
3, after polymer displacement of reservoir oil finishes, when not adopting technology of the present invention, the number of polymers of then injecting oil reservoir will go out of use.After adopting technology of the present invention, can make after its modification and utilize again.Owing to do not need the new polymer that reinjects, saved complicated ground installation and energy consumption.
4, the method for modification of the present invention is to inject a spot of flocculant of water adding, and its cost only is 1/3rd to 1/2nd of an original injection of polymer, and technology is very simple, is easy to inject.
The specific embodiment
The poly-modification processing method that retains polymer in the process that drives of oil exploitation of the present invention, be by in oil reservoir, adding flocculant, make it and remain in polymer in the oil reservoir and take place crosslinked and make polymer modification, form dispersion gel, to improve the oil displacement efficiency of polymer with granular texture.
Embodiment 1
At first get 20 kilograms citric acid, 20 kilograms aluminium chloride, 3 kilograms iron chloride and 57 kilograms water and be hybridly prepared into flocculant stoste; Then in flocculant stoste, add appropriate alkaline liquor, regulate its pH value and be 6-8; Adopt the content of the polymer in the liquid then according to the oil reservoir of flocculant to be added, the flocculant stoste that adds 0.05 kilogram by 1 kilogram polymer is calculated the amount that needs to add flocculant stoste, in view of the above flocculant stoste is splashed into then and inject water, be mixed with the flocculant that 1000 kilograms water contains 0.02 kilogram of flocculant stoste and inject water.At last flocculant is injected water and under 20 ℃ of temperature, pressure 15MPa condition, inject oil reservoir, make itself and the polymer that remains in the oil reservoir take place crosslinked and modification.
Embodiment 2
At first get 35 kilograms citric acid, 10 kilograms aluminium chloride, 5 kilograms iron chloride and 50 kilograms aqueous mixtures and be mixed with flocculant stoste; Then in flocculant stoste, add appropriate alkaline liquor, regulate its pH value and be 6-8; Adopt the content of the polymer in the liquid then according to the oil reservoir of flocculant to be added, the flocculant stoste that adds 0.1 kilogram by 1 kilogram polymer is calculated the amount that needs to add flocculant stoste, in view of the above flocculant stoste is splashed into then and inject water, be mixed with the flocculant that 1000 kilograms water contains 0.03 kilogram of flocculant stoste and inject water.At last flocculant is injected water and under 10 ℃ of temperature, pressure 20MPa condition, inject oil reservoir, make itself and the polymer that remains in the oil reservoir take place crosslinked and modification.
Embodiment 3
At first get iron chloride of 45 kilograms citric acid, 18 kilograms aluminium chloride, 2 kilograms of parts and 35 kilograms aqueous mixtures and be mixed with flocculant stoste; Then in flocculant stoste, add appropriate alkaline liquor, regulate its pH value and be 6-8; Adopt the content of the polymer in the liquid then according to the oil reservoir of flocculant to be added, the flocculant stoste that adds 0.02 kilogram by 1 kilogram polymer is calculated the amount that needs to add flocculant stoste, in view of the above flocculant stoste is splashed into then and inject water, be mixed with the flocculant that 1000 kilograms water contains 0.01 kilogram of flocculant stoste and inject water.At last flocculant is injected water and under 25 ℃ of temperature, pressure 10MPa condition, inject oil reservoir, make itself and the polymer that remains in the oil reservoir take place crosslinked and modification.
Oil exploitation of the present invention is poly-drives the modification processing method that retains polymer in the process, and its flocculant can add oil reservoir when polymer displacement of reservoir oil closes to an end, also can alternately add oil reservoir with polymer in the polymer displacement of reservoir oil process.
The poly-modified effect that drives the modification processing method that retains polymer in the process of oil exploitation of the present invention, by the solution that contains polymer, under different concentration, add the flocculant of inequality to extraction in the oil reservoir, under Electronic Speculum, observe the variation of its form, can obtain proof.
It is 0.07% that test 1, extraction liquid contain polymer concentration, does not add flocculant, amplifies 200 times under the Electronic Speculum, and observing its form is wire, has the reservoir minerals particulate to exist simultaneously.
It is 0.07% that test 2, extraction liquid contain polymer concentration, adds flocculant 0.0023%, amplifies 200 times under the Electronic Speculum, observes its form, and visible sphere micrograined texture illustrates polymer under the effect of flocculant, and form changes.
It is 0.01% that test 3, extraction liquid contain polymer concentration, adds flocculant 0.007%, amplifies 200 times under the Electronic Speculum, observes its form, visible sphere micrograined texture.
It is 0.03% that test 4, extraction liquid contain polymer concentration, adds flocculant 0.001%, amplifies 200 times under the Electronic Speculum, observes its form, visible sphere micrograined texture.
It is 0.03% that test 5, extraction liquid contain polymer concentration, adds flocculant 0.003%, amplifies 200 times under the Electronic Speculum, observes its form, visible sphere micrograined texture.
More than test explanation retains polymer under variable concentrations, mixes with a certain amount of flocculant, and all correctability forms particulate, thereby proves it in oil reservoir, by modification, can change reservoir permeability, plays displacement of reservoir oil effect again.
Claims (5)
1, the poly-modification processing method that retains polymer in the process that drives of a kind of oil exploitation, it is characterized in that: in oil reservoir, add flocculant, make it and remain in polymer in the oil reservoir and take place crosslinked and make polymer modification, formation has the dispersion gel of granular texture, to improve the oil displacement efficiency of polymer, concrete steps are as follows:
The preparation of step 1, flocculant stoste:
Get the citric acid of 20-50 weight portion, the aluminium chloride of 10-30 weight portion, the iron chloride on 2-5 weight portion ground and the water of 35-65 weight portion and be hybridly prepared into flocculant stoste;
The acid-base value of step 2, adjusting flocculant stoste;
In step 1, add appropriate alkaline liquor in the gained flocculant stoste, regulate its pH value and be 6-8;
Step 3, preparation flocculant inject water:
According to the content of the polymer in the oil reservoir extraction liquid of flocculant to be added, add step 2 gained flocculant stoste to injecting water according to a certain percentage, be mixed with flocculant and inject water;
Step 4, flocculant injected water inject oil reservoir:
Step 3 gained flocculant is injected water under uniform temperature and pressure, inject oil reservoir, make itself and the polymer that remains in the oil reservoir take place crosslinked and modification.
2, the poly-modification processing method that retains polymer in the process that drives of oil exploitation according to claim 1, it is characterized in that: in described step 3, press the flocculant stoste of the polymer adding 0.01-0.1 weight portion of 1 weight portion and calculate the amount that needs to add flocculant stoste, in view of the above flocculant stoste is splashed into then and inject water, the water that is mixed with 1000 weight portions contains the flocculant injection water of 0.01-0.03 weight portion flocculant stoste.
3, oil exploitation according to claim 2 is poly-drives the modification processing method that retains polymer in the process, and it is characterized in that: in described step 4, the temperature that the flocculant of described injection oil reservoir injects water is controlled at 0-30 ℃, and pressure is controlled at 5-20MPa.
4, oil exploitation according to claim 1 is poly-drives the modification processing method that retains polymer in the process, and it is characterized in that: described flocculant adds oil reservoir when polymer displacement of reservoir oil closes to an end.
5, oil exploitation according to claim 1 is poly-drives the modification processing method that retains polymer in the process, and it is characterized in that: described flocculant alternately adds oil reservoir with polymer in the polymer displacement of reservoir oil process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03151071XA CN100356034C (en) | 2003-09-19 | 2003-09-19 | Technology for modifying treatment of residual polymer in petroleum extrating polymer displacement proceture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03151071XA CN100356034C (en) | 2003-09-19 | 2003-09-19 | Technology for modifying treatment of residual polymer in petroleum extrating polymer displacement proceture |
Publications (2)
| Publication Number | Publication Date |
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| CN1598241A CN1598241A (en) | 2005-03-23 |
| CN100356034C true CN100356034C (en) | 2007-12-19 |
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| CNB03151071XA Expired - Fee Related CN100356034C (en) | 2003-09-19 | 2003-09-19 | Technology for modifying treatment of residual polymer in petroleum extrating polymer displacement proceture |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975051A (en) * | 2010-10-19 | 2011-02-16 | 大庆油田有限责任公司 | Chemical flooding alternate injection method |
| CN104636536A (en) * | 2014-12-23 | 2015-05-20 | 东北石油大学 | Numerical simulation method for performing oil displacing after polymer flooding by alternatively injecting gel and chemical agent through CMG software |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5559263A (en) * | 1994-11-16 | 1996-09-24 | Tiorco, Inc. | Aluminum citrate preparations and methods |
| CN1197101A (en) * | 1997-04-22 | 1998-10-28 | 高英敏 | Application of cross-linking agent in polymer displacement of reservoir oil tech. |
| CN1290804A (en) * | 1999-09-21 | 2001-04-11 | 法国石油研究所 | Method for preparing controlled size microgel |
-
2003
- 2003-09-19 CN CNB03151071XA patent/CN100356034C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5559263A (en) * | 1994-11-16 | 1996-09-24 | Tiorco, Inc. | Aluminum citrate preparations and methods |
| CN1197101A (en) * | 1997-04-22 | 1998-10-28 | 高英敏 | Application of cross-linking agent in polymer displacement of reservoir oil tech. |
| CN1290804A (en) * | 1999-09-21 | 2001-04-11 | 法国石油研究所 | Method for preparing controlled size microgel |
Non-Patent Citations (2)
| Title |
|---|
| CDG技术在大庆油田应用的可行性探讨 吴敬鹏等.大庆石油地质与开发，第18卷第4期 1999 * |
| 胶态分散凝胶研究的新进展 罗文利等.油田化学，第16卷第2期 1999 * |
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Owner name: DAQING RUISHENG CO., LTD. Free format text: FORMER OWNER: LIU HENG Effective date: 20120515 |
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Free format text: CORRECT: ADDRESS; FROM: 201206 PUDONG NEW AREA, SHANGHAI TO: 163316 DAQING, HEILONGJIANG PROVINCE |
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Effective date of registration: 20120515 Address after: 163316 room 105, block E, software park, Heilongjiang, Daqing Patentee after: Daqing Rui Sheng Technology Co., Ltd. Address before: 201206, room 97, No. 363, Lane 303, Taierzhuang Road, Shanghai, Pudong New Area Patentee before: Liu Heng |
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