CN100591742C - Method of raising oil deposit crude petroleum recovery ratio - Google Patents
Method of raising oil deposit crude petroleum recovery ratio Download PDFInfo
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- CN100591742C CN100591742C CN200510042009A CN200510042009A CN100591742C CN 100591742 C CN100591742 C CN 100591742C CN 200510042009 A CN200510042009 A CN 200510042009A CN 200510042009 A CN200510042009 A CN 200510042009A CN 100591742 C CN100591742 C CN 100591742C
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- foaming agent
- water
- polyacrylamide
- oil
- recovery ratio
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Abstract
A method for increasing the recovering rate of crude oil includes preparing the mixed solution from polyacrylamide, foaming agent and water, and proportionally filling said mixed solution and gas or N2 in the water injecting well alternatively by the alternative period of 20 days.
Description
Affiliated technical field:
The present invention relates to oil recovery technique field, oil field, relate in particular to the method that a kind of latter period of oilfield development improves oil recovery factor in the subsurface deposit.
Background technology:
Field produces when being in development late stage, promptly enters the high moisture and ultra-high water-containing stage, around the development effectiveness that how to improve maturing field, increases workable reserve, and for many years, numerous relevant oil exploitation technology experts are making great efforts to inquire into always.At present the water injection well displacement of reservoir oil by filling water is adopted in the oil field usually, and waterflood recovery efficiency factor is about 30%, also have a large amount of crude oil remain in underground can't extraction, cause the huge waste of these petroleum resources at full stretch.Polymer flooding is comparatively the advanced person's three to adopt technology at present, can improve recovery ratio 10%, but still have a large amount of crude oil not displace.How improving recovery ratio behind the polymer flooding for another example then is a very thing of difficulty, presses for the three new technology of adopting and solves the problem that how to improve recovery ratio.
Summary of the invention:
It is high to the purpose of this invention is to provide a kind of stability, froth quality well and can form strengthening foam, thereby the method for the raising oil deposil erude petroleum recovery ratio that the irreducible oil that water filling in the oil reservoir can not extraction is displaced.
Purpose of the present invention can realize by following technical measures:
This method is that a. earlier is mixed with polymkeric substance, foaming agent and water that to contain polymer concentration be that 100～10000mg/l, foaming agent concentration are the mixing solutions of 100～30000mg/l; B. again with mixing solutions and gas alternately or according to liquid: gas=1: 0.01～2 (subsurface volume) mixes the injection water injection well.
Purpose of the present invention also can realize by following technical measures:
Described polymkeric substance is a polyacrylic polymer; Described polyacrylic polymer is a polyacrylamide; Described gas is Sweet natural gas or purity greater than 90% nitrogen; Described alternate cycle is 1-20 days; It is that raw material is made that described foaming agent comprises with whipping agent host, suds-stabilizing agent and foam stabilizing additive.Described whipping agent host is lauryl alcohol Soxylat A 25-7 sulfuric acid ester sodium salt 10～50 (all in weight part), described suds-stabilizing agent is cocinic acid monoethanolamine 1～10, trimethyl-glycine 1～15, peroxamine 1～15, and described foam stabilizing additive is a sodium-chlor 0.1～3; Described suds-stabilizing agent also comprises carboxymethyl cellulose 0.1～3; Described raw material also comprises water 1～60.
In the actual production, polyacrylic polymer can be made into the mother liquor of 2000～10000mg/l, and then be mixed with mixed solution with foaming agent and water, here said water can be clear water, also can be oilfield sewage, mixed solution and gas are alternately or according to liquid: gas=1: 0.01～2 (subsurface volume) mixes the injection water injection well.
The present invention can be at latter period of oilfield development, further improve oil recovery factor for the oil field a kind of novel method is provided, be applicable to that reservoir temperature is not higher than 100 ℃, salinity is lower than 50000mg/l, calcium ions and magnesium ions concentration is lower than 10000mg/l, viscosity of crude is lower than oil reservoir viscosity 200mPa.s, rate of permeation 200 * 10
-3μ m
2～20000 * 10
-3μ m
2Oil reservoir.The present invention mixes polymers soln to form the strengthening foam oil-displacing agent with foaming agent solution, strengthening foam drives the new technology of developing exactly that can increase substantially oil recovery factor with wide application prospect under present technical background.It utilizes the visco-elasticity of polymkeric substance to strengthen the viscosity and the elasticity of foam film, thereby improves foamy stability, reduces the absorption loss of foaming agent on the stratum.Alternately inject the stratum by a certain percentage with nitrogen by water injection well, strengthening foam oil-displacing agent and nitrogen are in underground effect owing to the stratum microporous medium, mix and form the strengthening foam flooding system, stability is high, froth quality is good, when the strengthening foam oil-displacing agent was migrated on the stratum, viscosity was higher than single polymers soln, foaming agent solution and nitrogen far away.The increase of strengthening foam system kinetic viscosity has improved injection pressure, increases swept volume, and foaming agent can also reduce oil water interfacial tension, increases the washing oil ability.And it is stable that foam system is met water, and it is unstable to meet oil, makes effectively shutoff water layer of foam system, makes follow-up water drive enter oil reservoir, the irreducible oil that water filling in the oil reservoir can not extraction displaced, thereby increase substantially oil recovery rate, increase oil field workable reserve.Oil recovery 20% after the raising water drive, oil recovery 10% behind the polymer flooding.
Embodiment:
Embodiment 1:
A. polyacrylamide is made into the mother liquor of 2000mg/l;
B. with liquid charge pump foaming agent is pumped into the fluid injection pipeline, mix with polyacrylamide mother liquor, river among a, the formation concentration of polyacrylamide is that 5000mg/l, foaming agent concentration are the mixing solutions of 100mg/l;
C. the mixing solutions high pressure among the b is injected and implement the water injection well that strengthening foam drives, the strengthening foam system of at first injecting 0.2 times of formation pore volume is as preposition slug, then alternately injection reinforcing foam solution and purity are 95% Sweet natural gas, alternate cycle is 2 weather, 2 days liquid, control liquid gas subsurface volume ratio is 1: 0.5.
Embodiment 2:
A. polyacrylamide is made into the mother liquor of 8000mg/l;
B. with liquid charge pump foaming agent is pumped into the fluid injection pipeline, mix with polyacrylamide mother liquor, reservoir water among a, the formation concentration of polyacrylamide is that 10000mg/l, foaming agent concentration are the mixing solutions of 5000mg/l;
C. the mixing solutions high pressure among the b is injected and implement the water injection well that strengthening foam drives, the strengthening foam system of at first injecting 0.1 times of formation pore volume of stratum volume is as preposition slug, then alternately injection reinforcing foam solution and purity are 99% nitrogen, alternate cycle is 15 weather, 15 days liquid, control liquid gas subsurface volume ratio is 1: 1.
Embodiment 3:
A. polyacrylamide is made into the mother liquor of 5000mg/l;
B. with liquid charge pump foaming agent is pumped into the fluid injection pipeline, mix with polyacrylamide mother liquor, sewage among a, the formation concentration of polyacrylamide is that 100mg/l, foaming agent concentration are the mixing solutions of 30000mg/l;
C. the mixing solutions high pressure among the b is injected and implement the water injection well that strengthening foam drives, the strengthening foam system of at first injecting 0.01 times of formation pore volume of stratum volume is as preposition slug, then mix injection reinforcing foam solution and Sweet natural gas, control liquid gas volume ratio is 1: 1.
Embodiment 4:
A. polyacrylamide is made into the mother liquor of 10000mg/l;
B. with liquid charge pump foaming agent is pumped into the fluid injection pipeline, mix with polyacrylamide mother liquor, clear water among a, the formation concentration of polyacrylamide is that 2000mg/l, foaming agent concentration are the mixing solutions of 20000mg/l;
C. the mixing solutions high pressure among the b is injected and implement the water injection well that strengthening foam drives, the strengthening foam system of at first injecting 0.05 times of formation pore volume of stratum volume is as preposition slug, then mix injection reinforcing foam solution and nitrogen, control liquid gas volume ratio is 1: 0.01.
Claims (1)
1, a kind of method that improves oil deposil erude petroleum recovery ratio is characterized in that:
A. earlier polyacrylamide, foaming agent and water are mixed with that to contain concentration of polyacrylamide be that 100～10000mg/l, foaming agent concentration are the mixing solutions of 100～30000mg/l, described foaming agent (all in weight part) comprises lauryl alcohol polyethenoxy ether sodium sulfovinate salt 10～50, cocinic acid monoethanolamine 1～10, trimethyl-glycine 1～15, peroxamine 1～15, sodium-chlor 0.1～3 and carboxymethyl cellulose 0.1～3;
B. again with mixing solutions and gas alternately or according to underground liquid: gas=1: 0.01～2 volume ratios are mixed the injection water injection well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510042009A CN100591742C (en) | 2005-01-07 | 2005-01-07 | Method of raising oil deposit crude petroleum recovery ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510042009A CN100591742C (en) | 2005-01-07 | 2005-01-07 | Method of raising oil deposit crude petroleum recovery ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1651545A CN1651545A (en) | 2005-08-10 |
| CN100591742C true CN100591742C (en) | 2010-02-24 |
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| CN200510042009A Expired - Fee Related CN100591742C (en) | 2005-01-07 | 2005-01-07 | Method of raising oil deposit crude petroleum recovery ratio |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101210487B (en) * | 2006-12-28 | 2012-03-21 | 中国石油化工股份有限公司 | Design method for increasing recovery efficiency technique |
| CN101016835B (en) * | 2007-02-28 | 2010-05-19 | 中国石化股份胜利油田分公司孤岛采油厂 | Thermal production well filling vapor and nitrogen foam profile control technique |
| CN101126312B (en) * | 2007-08-17 | 2013-01-23 | 中国科学院武汉岩土力学研究所 | Fluctuation petroleum exploitation method |
| CN101314710B (en) * | 2008-07-18 | 2014-07-09 | 中国石油大学(华东) | Oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
| CN101619208B (en) * | 2009-08-18 | 2011-11-09 | 大庆油田有限责任公司 | Acid-resisting and oil-resisting type foam plugging agent |
| CN102212348B (en) * | 2010-04-07 | 2013-04-24 | 中国石油天然气股份有限公司 | Foam scrubbing agent with salt resistance and methanol resistance |
| CN102312666B (en) * | 2010-07-06 | 2014-10-15 | 中国石油天然气股份有限公司 | Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir |
| CN102703052B (en) * | 2012-06-11 | 2014-05-07 | 中国石油天然气股份有限公司 | Foam system suitable for profile control and oil displacement of oil field and oil displacement method |
| CN103497751A (en) * | 2013-10-12 | 2014-01-08 | 陕西延长石油(集团)有限责任公司研究院 | High-efficiency air foam oil displacement system |
| CN103834379B (en) * | 2014-01-03 | 2016-09-07 | 中国石油大学(华东) | A kind of vermiculate glues foam system and the method improving recovery ratio with it |
| CN103980873B (en) * | 2014-06-04 | 2016-11-09 | 中国地质大学（北京） | A kind of three-phase froth composite oil-displacing system and application thereof |
| CN106479470B (en) * | 2015-08-31 | 2020-12-11 | 中国石油化工股份有限公司 | Low-tension foaming agent for improving recovery ratio of crude oil of heterogeneous oil reservoir and oil displacement method |
| CN106590602B (en) * | 2015-10-14 | 2018-09-28 | 中国石油化工股份有限公司 | A kind of composite foamable agent and its application |
| CN109812249B (en) * | 2017-11-20 | 2023-08-08 | 中国石油化工股份有限公司 | Oil reservoir oil displacement method |
| CN113187454A (en) * | 2021-05-24 | 2021-07-30 | 新疆克拉玛依市采丰实业有限责任公司 | Method for increasing recovery ratio of oil field by "oil displacement with chemicals |
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| CN1651545A (en) | 2005-08-10 |
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