CN101210487A - Design method for increasing recovery efficiency technique - Google Patents
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Abstract
The invention is a method of designing the oil field exploitation to improve oil recovery based on test results of pore size distributions of an oil pool. The method includes the following steps: measuring and determining the pore size distributions of a stratigraphic oil pool, dividing the total pore volume in a stratum into a plurality of equal parts (i.e. amount of slugs) which correspond to the corresponding pore size distributions, computing the average pore radius of each equal pore volume, correspondingly designing the size of polymer or cross-linking polymer particles in a displacing fluid system and the volume of a displacing slug, and then injecting the polymer or the cross-linking polymer particles in sequence from big to small into the stratum according to the amount of slugs of the designed displacing liquid system, the size of the corresponding polymer or the corresponding cross-linking polymer particles and the volume of the displacing slugs. In a technical method of designing and implementing the improved oil recovery based on the method of the invention, injection pressure of a displacing agent ascends slowly, and ascending range and speed of the injection pressure can be easily controlled, thereby more effectively improving the recovery of petroleum.
Description
Technical field:
The invention belongs to technical field of petroleum extraction.It is a kind of method for designing of utilizing oil reservoir pore-size distribution test result design oil field development to improve recovery efficiency technique.
Technical background:
At present, both at home and abroad the oil field method that improves recovery ratio on the water drive basis mainly adopts technologies such as polymer displacement of reservoir oil, complex oil displacing, the miscible displacement of reservoir.These technologies respectively have characteristics, on the water drive basis for improving the oil field development situation and improving and all can obtain certain effect aspect the recovery ratio.
CN 1320762A proposes a kind of nm-membrane oil-displacing technique, this technology is by annotating people's nanometer film agent solution to annotating people's well, in oil reservoir, produce absorption, change wetability, diffusion and capillary tube, reach the purpose of improving oil displacement efficiency, improving oil recovery from the imbibition effect; CN 1117803C provides a kind of method that is applicable to the new manufacturing liquid or solid aluminium citrate crosslinking agent of the crosslinked polymer technology that improves recovery ratio in oil field secondary and the tertiary oil recovery process; CN 1400275A, CN 1215145C, CN 1352224A and CN 1569824A have proposed to be used to improve the surfactant of oil recovery factor, and/or composition, and/or formula system; CN 1414057A proposes a kind of oil field and improves the recovery ratio mobility control agent, and promptly comb shaped antisalt polymer thickening agent presents the class comb shaped structure in the aqueous solution, and anti-salt property is good; CN 1478850A proposes a kind of method of utilizing polymer solution and binary system to improve oil recovery, adopt sewage preparation salt-resistant polymer and in polymer flooding industrialization block, inject the compound system slug, promptly take alternately injection mode of polymer solution and binary system (alkali/surfactant), make polymer flooding recovery ratio improvement value on existing value basis, improve recovery ratio again; CN 1429877A proposes a kind of ternary built system displacement of reservoir oil composition of low concentration surfactant low concentration alkali, can reduce input cost, reduces the requirement to surfactant, further improves recovery ratio; CN 1441026A proposes a kind of BIOLOGICAL CALCIUM mastic compound sealing agent that condenses, and is made up of biological calcium powder, mineral powder and the material that can generate the paste colloid.Be mainly used in oilfield chemistry water plugging and profiling technology and the tertiary oil recovery; Polypropylene phthalein amine of a CN 1528796A organic silicon monomer modification and preparation method thereof, the polymer that obtains have outstanding heat resistance and salt resistant character preferably, can be widely used in fields such as tertiary oil recovery, drilling fluid, coating; CN 1528797A proposes a kind of water soluble polymer amount hydrophobic associated polymer that contains the novel fluoro-carbon group and preparation method thereof, this polymer has efficient hydrophobic association effect, the heat-resistant salt-resistant performance is outstanding, can be applicable to fields such as tertiary oil recovery, drilling fluid, coating; CN 1105417A proposes a kind of cross-linked polymer oil-displacing agent and compound method thereof, be to add people's crosslinking agent in the process of polymer waterflooding, make polymer solution tackify in the flow process in the stratum, compensation is because the excessive loss of polymer viscosity that mechanical shearing causes, improve oil displacement efficiency, improve recovery ratio; CN1251856A has proposed the microgel particle displacement of reservoir oil with adjustable grain, can stop up macropore in the near wellbore zone, has the effect that makes fluid diversion in the oil reservoir deep, enlarges the swept volume of annotating people's water, improves recovery ratio; CN1632042A chemical agent-relative permeability modifier that in oil reservoir development, improves oil recovery factor, and utilizing relative permeability modifier to improve the method for oil recovery factor, the relative permeability modifier of this invention comprises 100-5000ppm polypropylene phthalein amine and 100-5000ppm crosslinking agent.
But, still have following technical problem in the prior art: polymer displacement of reservoir oil, combination flooding wet goods chemical displacement of reservoir oil technology use at the scene and implementation process in to exist displacing agent generally relatively more serious along large aperture fingering phenomenon, cause the not high enough result of effective rate of utilization of displacing agent; Or adopt form such as underground crosslinked polymer flooding, and injection pressure may occur and rise comparatively fast, cause displacing agent to inject difficulty, even annotate not enter.All these, tracing it to its cause mainly is not consider displacing agent and stratum filtration characteristic---the relevance of stratum pore-size distribution.And these methods exist the problem of aspects such as ground injection technology complexity, cycle length, input expense height, influence and limiting the further application of these technologies.
Summary of the invention:
The present invention is in order to solve the problems of the technologies described above, a kind of oil reservoir pore-size distribution test result of utilizing is provided, the voids volume amount has been divided into several five equilibriums, i.e. slug quantity, and corresponding with corresponding pore-size distribution, calculate the average pore radius of each five equilibrium voids volume.Design the polymer of displacement system or the size and the volume of polymer particles in view of the above, give full play to the effect that the displacement system enlarges swept volume, realize more effectively improving the purpose of recovery ratio.
The present invention is achieved in that
A kind of method of utilizing oil reservoir pore-size distribution test result design oil field development to improve recovery ratio, method is measured the pore-size distribution of stratigraphic oil pool, stratum total pore size volume amount is divided into several five equilibriums, be slug quantity, corresponding with corresponding pore-size distribution, calculate the average pore radius of each five equilibrium voids volume, correspondingly design polymer or the size of polymer cross-linked body particulate and the volume of displacing fluid slug of displacing fluid system, slug number according to the displacing fluid system that designs, and the volume of the size of corresponding polymer or polymer cross-linked body particulate and displacing fluid slug, inject the stratum according to polymer or polymer cross-linked body diameter of particle size order.
Described method is specially:
A, according to geologic information and production dynamic analysis, select oil field (block);
The pore-size distribution on stratum (oil reservoir) in B, the mensuration work area scope; When the stratum is multilayer, can lamination process;
C, determine displacement slug quantity:
1. stratum total pore size volume amount in the calculation block scope;
2. stratum total pore size volume amount is divided into several five equilibriums, i.e. slug quantity, the volume of each five equilibrium is defined as 1PV;
3. and corresponding, calculate the average pore radius of each five equilibrium voids volume with corresponding pore-size distribution;
4. the average pore radius is arranged in order;
The size and the volume of D, the polymer of determining each displacement slug or polymer cross-linked body particulate, the average pore radius of each the five equilibrium voids volume after promptly sorting, the volume of the size of the polymer of calculation Design displacing fluid system or polymer cross-linked body particulate and polymer or polymer cross-linked body particulate displacing fluid slug accordingly according to the stratum total pore size volume amount of determining, slug quantity, average pore radius:
1. the size of polymer or polymer cross-linked body particulate is doubly determined according to the 2-0.1 of the average pore radius of corresponding five equilibrium voids volume;
2. the volume of the slug of polymer or polymer cross-linked body particulate displacing fluid is determined according to 3-0.0001PV;
E, inject the displacement system: according to the slug quantity of the displacing fluid system of calculation Design, and the volume of the size of corresponding polymer or polymer cross-linked body particulate and polymer or polymer cross-linked body particulate displacing fluid slug, polymer or polymer cross-linked body particulate are injected the stratum successively according to order, realization is given full play to the displacement system and is enlarged swept volume, and injection pressure is steady relatively, improves the purpose of recovery ratio.
In the application of reality, calculate stratum total pore size volume amount in the scope of work area, and stratum total pore size volume amount is divided into 2-10 five equilibrium, be preferably 3-5 five equilibrium, promptly slug quantity is preferably 3-5.
In the application of reality, the size of polymer or polymer cross-linked body particulate according to the 1-0.1 of the average pore radius of corresponding five equilibrium voids volume doubly, preferably doubly according to the average pore radius 0.5-0.3 of corresponding five equilibrium voids volume.
In the application of reality, the volume of the polymer of displacing fluid system or polymer cross-linked body particulate is according to 1-0.001 times of corresponding five equilibrium hole volume, and preferably 0.3-0.01 doubly.
In the application of reality, in step C, 4. will wait the length ordering of the average pore radius ordering of branch voids volume, as sorting from long to short according to radius length according to the average pore radius; In the step e polymer or polymer cross-linked body particulate are injected the stratum successively by crosslinked body diameter of particle size in addition, as injecting the stratum from large to small according to crosslinked body diameter of particle.
Utilize the inventive method design and enforcement to improve the technical method of recovery ratio, the displacing agent injection pressure rises slowly, and can easily control size and speed that injection pressure rises, more effectively improves the recovery ratio of oil.
The specific embodiment:
Determine to need to implement to improve the oil field (block) of recovery ratio, design and implement to improve the method for recovery ratio.Specific as follows:
1,, selects suitable oil field (block) according to geologic information and production dynamic analysis.Adopt the oil field or the block of this technology must have perfect injection-production relation, the main standard and the primary condition that promptly are suitable for oil field (block) are existing producing wells, water injection well is arranged again, and oil, the corresponding connected relation of well is good, producing well can be seen flood effectiveness, and determines the work area scope according to well pattern.
2, measure the pore-size distribution on stratum (oil reservoir) in the scope of work area, when the stratum is multilayer, can overlap-add procedure.
3, displacement slug quantity determines.Calculate stratum total pore size volume amount in the scope of work area, and stratum total pore size volume amount is divided into several five equilibriums, be slug quantity, the volume of each five equilibrium can be defined as 1PV, and it is corresponding with corresponding pore-size distribution, calculate the average pore radius of each five equilibrium voids volume, and the average pore radius is pressed order arrangement from big to small.
Stratum total pore size volume amount can be divided into 2-20 five equilibrium, be divided into 2-10 five equilibrium suitably, more suitably be divided into 3-5 five equilibrium.After determining isodisperse, calculate the average pore radius of each five equilibrium voids volume, and the average pore radius is pressed order arrangement from big to small.
4, the size of the polymer of each displacement slug or polymer cross-linked body particulate and volume determines.According to stratum total pore size volume amount isodisperse (being slug quantity), the volume determined, calculate the average pore radius of corresponding each five equilibrium voids volume, according to average pore radius order from big to small, correspondingly design polymer or the size of polymer cross-linked body particulate and the volume of displacement slug of displacement system.
The design of the size of polymer or polymer cross-linked body particulate, can doubly determine according to the 2-0.1 of the average pore radius of corresponding five equilibrium voids volume, 1-0.3 according to the average pore radius of corresponding five equilibrium voids volume doubly determines suitably, and more suitably the average pore radius 0.5-0.3 according to corresponding five equilibrium voids volume doubly determines.
The volume design of the slug of polymer or polymer cross-linked body particulate displacing fluid can be determined according to 3-0.0001PV, determines according to 1-0.001PV suitably, more suitably determines according to 0.3-0.01PV.
The injection of 5, displacement system.Slug number according to the displacement system that designs, and the volume of the size of corresponding polymer or polymer cross-linked body particulate and displacement slug, inject the stratum successively according to polymer or polymer cross-linked body particulate order from big to small, realization is given full play to the displacement system and is enlarged swept volume, and injection pressure is steady relatively, improves the purpose of recovery ratio.
Embodiment 1
Certain oil field determines to carry out using polymer or polymer cross-linked body particulate solution drives the work of raising recovery ratio.Select the formation core sample of a bite representative in this oil field or many mouthfuls of oil wells or water injection well, the pore size of employing mercury injection method mensuration formation core sample and distribution thereof, voids volume amount, in conjunction with reservoir geology, engineering research, obtain stratum total pore size volume amount in the scope of work area.Stratum total pore size volume amount will be divided into 3 five equilibriums, i.e. slug quantity, the volume of each five equilibrium is defined as 1PV, and corresponding with corresponding pore-size distribution.Utilize the data of the pore size of the formation core sample that mercury injection method measures and distribution thereof, voids volume amount, can calculate the average pore radius of each five equilibrium voids volume, and the average pore radius is arranged by order from big to small, the results are shown in Table 1.
Table 1
| Sequence number | Pore throat radius (μ m 2) | Average pore throat radius (μ m 2) | Volume (m 3) |
| 1 | 64.0-20.0 | 42.0 | 1500 |
| 2 | 20.0-5.3 | 12.7 | 1500 |
| 3 | 5.3-0.2 | 2.3 | 1500 |
According to above-mentioned testing research result, the size of design polymer or polymer cross-linked body particulate is determined for 0.5 times according to the average pore radius; The volume of the size of corresponding polymer or polymer cross-linked body particulate and displacement slug is determined according to the 0.3PV amount, sees Table 2.
Table 2
| The slug sequence number | Polymer or polymer cross-linked body particle radius (μ m 2) | Volume (m 3) |
| 1 | 21.0 | 450 |
| 2 | 6.4 | 450 |
| 3 | 1.2 | 450 |
According to the displacement system injection of polymer or the polymer cross-linked body particulate solution slug of design, realize giving full play to the displacement system and enlarge swept volume, and injection pressure is steady relatively, improves the purpose of recovery ratio.
Embodiment 2
One oil field is the oil reservoir pore-size distribution after tested, in conjunction with reservoir geology, engineering research, obtain stratum total pore size volume amount in the scope of work area, and stratum total pore size volume amount will be divided into 3 five equilibriums, i.e. slug quantity, and the volume of each five equilibrium is defined as 1PV, and it is corresponding with corresponding pore-size distribution, calculate the average pore radius of each five equilibrium voids volume, and the average pore radius is pressed order arrangement from big to small, the results are shown in Table 1.
Table 1
| Sequence number | Pore throat radius (μ m 2) | Average pore throat radius (μ m 2) | Volume (m 3) |
| 1 | 64.0-20.0 | 42.0 | 1500 |
| 2 | 20.0-5.3 | 12.7 | 1500 |
| 3 | 5.3-0.2 | 2.3 | 1500 |
According to above-mentioned testing research result, the size of design polymer or polymer cross-linked body particulate is determined for 0.5 times according to the average pore radius; The volume of the size of corresponding polymer or polymer cross-linked body particulate and displacement slug is determined according to the 0.5PV amount, sees Table 2.
Table 2
| The slug sequence number | Polymer or polymer cross-linked body particle radius (μ m 2) | Volume (m 3) |
| 1 | 21.0 | 750 |
| 2 | 6.4 | 750 |
| 3 | 1.2 | 750 |
In order to realize better improving the effect of recovery ratio, after injecting each polymer or polymer cross-linked body particulate solution slug, the 0.3PV that reinjects i.e. 450 (m
3) surfactant solution, realizes giving full play to the displacement system and enlarge swept volume, and injection pressure is steady relatively, improves the bigger purpose of recovery ratio amplitude.
Claims (6)
1. one kind is utilized oil reservoir pore-size distribution test result to design the method that oil field development improves recovery ratio, it is characterized in that: described method is measured the pore-size distribution of stratigraphic oil pool, stratum total pore size volume amount is divided into several five equilibriums, be slug quantity, corresponding with corresponding pore-size distribution, calculate the average pore radius of each five equilibrium voids volume, correspondingly design polymer or the size of polymer cross-linked body particulate and the volume of displacing fluid slug of displacing fluid system, slug number according to the displacing fluid system that designs, and the volume of the size of corresponding polymer or polymer cross-linked body particulate and displacement slug, inject the stratum in proper order according to polymer or polymer cross-linked body diameter of particle.
2. oil field development according to claim 1 improves the method for recovery ratio, and it is characterized in that: described method is specially:
A, according to geologic information and production dynamic analysis, select oil field (block);
The pore-size distribution on stratum (oil reservoir) in B, the mensuration work area scope; When the stratum is multilayer, can lamination process;
C, determine displacement slug quantity:
1. stratum total pore size volume amount in the calculation block scope;
2. stratum total pore size volume amount will be divided into several five equilibriums, i.e. slug quantity, the volume of each five equilibrium is defined as 1PV;
3. and corresponding, calculate the average pore radius of each five equilibrium voids volume with corresponding pore-size distribution;
4. the average pore radius is arranged in order;
The size and the volume of D, the polymer of determining each displacing fluid slug or polymer cross-linked body particulate, the average pore radius of each the five equilibrium voids volume after promptly sorting, the volume of the size of the polymer of calculation Design displacing fluid system or polymer cross-linked body particulate and polymer or polymer cross-linked body particulate displacing fluid slug accordingly according to the stratum total pore size volume amount of determining, slug quantity, average pore radius:
1. the size of polymer or polymer cross-linked body particulate is doubly determined according to the 2-0.1 of the average pore radius of corresponding five equilibrium voids volume;
2. the volume of the slug of polymer or polymer cross-linked body particulate displacing fluid is determined according to 3-0.0001PV;
E, inject the displacement system: according to the slug quantity of the displacing fluid system of calculation Design, and the volume of the size of corresponding polymer or polymer cross-linked body particulate and polymer or polymer cross-linked body particulate displacing fluid slug, polymer or polymer cross-linked body particulate are injected the stratum successively according to order, realization is given full play to the displacement system and is enlarged swept volume, and injection pressure is steady relatively, improves the purpose of recovery ratio.
3. oil field development according to claim 2 improves the method for recovery ratio, it is characterized in that calculating stratum total pore size volume amount in the scope of work area, and stratum total pore size volume amount is divided into 2-10 five equilibrium, is preferably 3-5 five equilibrium, and promptly slug quantity is preferably 3-5.
4. oil field development according to claim 2 improves the method for recovery ratio, the size that it is characterized in that polymer or polymer cross-linked body particulate according to the 1-0.3 of the average pore radius of corresponding five equilibrium voids volume doubly, preferably doubly according to the average pore radius 0.5-0.3 of corresponding five equilibrium voids volume.
5. oil field development according to claim 2 improves the method for recovery ratio, the volume that it is characterized in that the polymer of displacement system or polymer cross-linked body particulate according to the 1-0.001 of corresponding five equilibrium hole volume doubly, preferably 0.3-0.01 is doubly.
6. oil field development according to claim 2 improves the method for recovery ratio, it is characterized in that 4. will waiting the length ordering of the average pore radius ordering of branch voids volume according to the average pore radius in step C, as sorting from long to short according to radius length; In the step e polymer or polymer cross-linked body particulate are injected the stratum successively by crosslinked body diameter of particle size in addition, as injecting the stratum from large to small according to crosslinked body diameter of particle.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146788A (en) * | 2011-03-30 | 2011-08-10 | 中国石油化工股份有限公司 | Method for enhancing recovery ratio through three-dimensional streamline regulation of water drive reservoir |
| CN102339339A (en) * | 2010-07-23 | 2012-02-01 | 中国石油化工股份有限公司 | Method for analyzing remaining oil distribution of fractured-vuggy reservoir |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2175056C1 (en) * | 2001-02-26 | 2001-10-20 | Чикин Андрей Егорович | Process of exploitation of oil field |
| CN1400275A (en) * | 2001-08-01 | 2003-03-05 | 大庆高新区鑫诺精细化工有限公司 | Composite for raising recovery efficiency of crude |
| CN1237256C (en) * | 2001-11-16 | 2006-01-18 | 大庆油田有限责任公司 | Method for increasing petroleum recovery ratio using three-compoonent composite displacement emulsification |
| CN1478850A (en) * | 2002-08-26 | 2004-03-03 | 大庆油田有限责任公司 | Method fo raising petroleum recovery ration using polymer solution dielement system |
| CN1587341A (en) * | 2004-07-07 | 2005-03-02 | 大庆油田有限责任公司 | Process for improving raw oil productive rate by high dense polymer flooding |
| CN100591742C (en) * | 2005-01-07 | 2010-02-24 | 中国石化胜利油田有限公司地质科学研究院 | Method of raising oil deposit crude petroleum recovery ratio |
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2006
- 2006-12-28 CN CN 200610169765 patent/CN101210487B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339339A (en) * | 2010-07-23 | 2012-02-01 | 中国石油化工股份有限公司 | Method for analyzing remaining oil distribution of fractured-vuggy reservoir |
| CN102339339B (en) * | 2010-07-23 | 2014-01-15 | 中国石油化工股份有限公司 | Method for analyzing remaining oil distribution of fractured-vuggy reservoir |
| CN102146788A (en) * | 2011-03-30 | 2011-08-10 | 中国石油化工股份有限公司 | Method for enhancing recovery ratio through three-dimensional streamline regulation of water drive reservoir |
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