CN101113668A - Method for enhancing offshore oilfield recovery - Google Patents
Method for enhancing offshore oilfield recovery Download PDFInfo
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- CN101113668A CN101113668A CNA2006100888884A CN200610088888A CN101113668A CN 101113668 A CN101113668 A CN 101113668A CN A2006100888884 A CNA2006100888884 A CN A2006100888884A CN 200610088888 A CN200610088888 A CN 200610088888A CN 101113668 A CN101113668 A CN 101113668A
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Abstract
The invention discloses a method for improving petroleum mining rate in offshore petroleum well. The method of the invention injects polymer oil-displacing agent to the petroleum well when mining. With a consideration of the characteristics of offshore petroleum well mining such as short service life of the mining platform, low mining rate, etc., the invention creatively adds polymer oil-displacing agent to the well in the early stage of the oil field exploitation, which dramatically improves mining rate, keeps continuous and rapid exploitation and reduces water content of raw petroleum and has great economic, technologic and social benefits.
Description
Technical field
The present invention relates to improve the method for offshore oilfield recovery.
Background technology
Oil field-the Bohai Bay Oil of CHINESE OFFSHORE maximum, heavy oil reserves surpasses 80%, and than the oil field, land, Bohai Bay Oil has particular surroundings:
1) the Bohai Bay Oil reservoir is a loose sand, and compound cyclothemic deposition, the anti-rhythm are main;
2) crude oil oil in the Bohai Sea is thick, its stratum viscosity 40-700mpa.s, be the oil field, land 1.5-10 doubly;
3) Bohai Bay Oil formation water salinity height (＞10000mg/L), Ca especially
2+/ Mg
2+Content is 2-9 times of oil field, land greater than 600mg/L;
4) the Bohai Bay Oil oil reservoir is thick, for the 3-6 in oil field, land doubly;
5) the Bohai Bay Oil substratum is many, general big section exploitation, at least 10 substratums of dividing;
6) Bohai Bay Oil permeability grade big (0.1-10D), average 2-4D, non-homogeneity is serious;
7) Bohai Bay Oil well pattern irregularity adopts nine-spot pattern more, and five-spot pattern is adopted in the oil field, land more;
8) the Bohai Bay Oil well spacing is big, reaches 350-600 rice, is 1.5-3 times of oil field, land.
At present, offshore oilfield adopts the water-drive oil recovery technology mostly, but owing to aforementioned features, adds limited by the application life of production platform that the overall recovery ratio in oil field has only 17-25%, and it is huge, also extremely urgent to improve recovery factor potential.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves offshore oilfield recovery.
The method of raising offshore oilfield recovery provided by the present invention, be at sea the oil field begin to recover the oil or in low Water-cut Period, just injection of polymer oil displacement agent in oil well.
Wherein, described polymer oil-displacing agent is partially hydrolyzed polyacrylamide (PHPA), hydrophobic associated polymer or the structure composite polymer of super high molecular weight.The concentration of polymer oil-displacing agent is 1000-1750mg/L.The diurnal injection of polymer oil-displacing agent is 400-600m
3
The mode that the injection of polymer oil displacement agent adopts in oil well is: the mother liquor that at first with preparation water polymer quick dissolution is mixed with high concentration, then mother liquor is diluted to the polymer solution of aimed concn, directly annotates the purpose oil reservoir from water injection well by the injection pump supercharging.
In the present invention, the daily water-injection rate of water injection well is 400-600m
3
The characteristics that the present invention recovers the oil according to offshore oilfield: offshore production platform weak point in application life and recovery ratio are low etc., early stage of oil field development or in low Water-cut Period, beginning injection of polymer oil displacement agent, increase substantially the recovery ratio in oil field, the lasting high speed exploitation that keeps the oil field, and reduce the production waste amount, have huge economy, technology and society benefit.
The specific embodiment
Embodiment 1, the early stage notes in LD10-1 oil field, the Bohai Sea are gathered oil recovery
New brought in well adopts early stage poly-oil recovery of annotating in LD10-1 oil field, the Bohai Sea: daily water-injection rate is 200-900m
3Used polymer oil-displacing agent is the partially hydrolyzed polyacrylamide (PHPA) of super high molecular weight, adopts the injection pump supercharging mode to be injected in the oil reservoir by water injection well, polymer displacement of reservoir oil agent concentration 1200mg/L, day fluence 600m
3, the injection of polymer oil displacement agent is 5 years continuously, uses 1040 tons in polymer oil-displacing agent dry powder altogether.The result shows: compare with present conventional oil recovery technique, improve 2.95%, 5 year accumulative total of recovery ratio and increase oil 1.56 * 10
5m
3, polymer per ton increases 150 tons of oil, and the institute's Water in oil of quarrying reduction amplitude peak reaches 20%.Other well water filling and this well injection of polymer carry out synchronously.
Embodiment 2, Bohai Sea SZ36-1 viscous crude field individual well are annotated poly-the oil recovery
Adopt individual well to annotate poly-the oil recovery at Bohai Sea SZ36-1 viscous crude field: used polymer oil-displacing agent is a hydrophobic associated polymer, adopts the injection pump supercharging mode to inject, polymer displacement of reservoir oil agent concentration 1750mg/L, day fluence 500m
3, annotate the poly-576 days time, 420 tons of polymer dry powders.The result shows: compare with present conventional oil recovery technique, improve recovery ratio 2.4%, accumulative total increases oil 2.4 * 10
4m
3, polymer per ton increases 57 tons of oil, and Water Content in Oil reduces to 48% from annotating 95% before poly-, and actual moisture reduction by 47% has obtained the oil increasing precipitation effect of highly significant.
Embodiment 3, Bohai Sea SZ36-1 viscous crude field well group are annotated poly-test
Select 4 mouthfuls of wells to annotate poly-the oil recovery at Bohai Sea SZ36-1 viscous crude field: used polymer oil-displacing agent is a hydrophobic associated polymer, adopts the injection pump supercharging mode to inject, polymer concentration 1750mg/L, day fluence 2400m
3, annotate the poly-3 years time, 3143 tons of polymer dry powders.The result shows: compare with present conventional oil recovery technique, improve recovery ratio 3%, accumulative total increases oil 1.89 * 10
5m
3, polymer per ton increases 60 tons of oil, and crude oil water containing reduces by 10%.
Claims (6)
1. a method that improves the offshore field oil recovery is characterized in that, when at sea the oil field begins to recover the oil, i.e. and injection of polymer oil displacement agent.
2. method according to claim 1 is characterized in that: described polymer oil-displacing agent is partially hydrolyzed polyacrylamide (PHPA), hydrophobic associated polymer or the structure composite polymer of super high molecular weight.
3. method according to claim 2 is characterized in that: the concentration of polymer oil-displacing agent is 1000-1750mg/L.
4. method according to claim 2 is characterized in that: the individual well diurnal injection of polymer oil-displacing agent is 400-600m
3
5. according to the arbitrary described method of claim 1-4, it is characterized in that: the mode that the injection of polymer oil displacement agent adopts in oil well is the mother liquor that at first with preparation water polymer quick dissolution is mixed with high concentration, then mother liquor is diluted to the polymer solution of aimed concn, directly annotates the purpose oil reservoir from water injection well by the injection pump supercharging.
6. method according to claim 5 is characterized in that: at water injection rate in oil well is 200-900m
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610088888A CN100580218C (en) | 2006-07-24 | 2006-07-24 | Method for enhancing offshore oilfield recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610088888A CN100580218C (en) | 2006-07-24 | 2006-07-24 | Method for enhancing offshore oilfield recovery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101113668A true CN101113668A (en) | 2008-01-30 |
| CN100580218C CN100580218C (en) | 2010-01-13 |
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ID=39022178
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610088888A Active CN100580218C (en) | 2006-07-24 | 2006-07-24 | Method for enhancing offshore oilfield recovery |
Country Status (1)
| Country | Link |
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| CN (1) | CN100580218C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454396A (en) * | 2010-10-27 | 2012-05-16 | 中国海洋石油总公司 | Method for profile control by using formation polymer in offshore oil field polymer flooding process |
| CN104314533A (en) * | 2014-08-22 | 2015-01-28 | 中国地质大学（北京） | Method for improving crude oil recovery ratio by utilizing salt sensitive self-thickening polymer |
| CN107605446A (en) * | 2017-08-18 | 2018-01-19 | 西南石油大学 | A kind of system compound method for being used to start low-permeability layer remaining oil in high permeability reservoir |
-
2006
- 2006-07-24 CN CN200610088888A patent/CN100580218C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454396A (en) * | 2010-10-27 | 2012-05-16 | 中国海洋石油总公司 | Method for profile control by using formation polymer in offshore oil field polymer flooding process |
| CN104314533A (en) * | 2014-08-22 | 2015-01-28 | 中国地质大学（北京） | Method for improving crude oil recovery ratio by utilizing salt sensitive self-thickening polymer |
| CN107605446A (en) * | 2017-08-18 | 2018-01-19 | 西南石油大学 | A kind of system compound method for being used to start low-permeability layer remaining oil in high permeability reservoir |
| CN107605446B (en) * | 2017-08-18 | 2019-08-02 | 西南石油大学 | It is a kind of for starting the system preparation method of low-permeability layer remaining oil in high permeability reservoir |
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| Publication number | Publication date |
|---|---|
| CN100580218C (en) | 2010-01-13 |
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