CN104594859B - A kind of method of the fine and close oily oil reservoir of nano-fluid exploitation - Google Patents
A kind of method of the fine and close oily oil reservoir of nano-fluid exploitation Download PDFInfo
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- CN104594859B CN104594859B CN201510014844.6A CN201510014844A CN104594859B CN 104594859 B CN104594859 B CN 104594859B CN 201510014844 A CN201510014844 A CN 201510014844A CN 104594859 B CN104594859 B CN 104594859B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The present invention relates to a kind of method that nano-fluid exploits fine and close oily oil reservoir.This method comprises the following steps：Nano-fluid slug is injected into fine and close oily oil reservoir, then water filling and is exploited into oil reservoir by injection well, waterflood injection rate is less than 1.4m/d.In the method for the present invention, the close oily reservoir of oily humectation can be the wet reservoir of water anyway by nano-fluid slug, and the water being subsequently implanted into dialysis can enter Medium Culture under the action of capillary force, so as to employ Medium Culture remaining oil；Low speed water filling can be to avoid sudden water flooding caused by injection water along the quick channelling in crack；Water filling can supplement the stratum energy after compact oil reservoir primary oil recovery.
Description
Technical field
The invention belongs to fine and close oily oil reservoir production technique field, is related to a kind of side of the fine and close oil oil reservoir of nano-fluid exploitation
Method.
Background technology
With the development that deepens continuously of oil-gas exploration and development, the unconventional oil such as tight gas, shale gas, coal bed gas, fine and close oil
Gas illustrates huge potentiality under the conditions of existing economic technology, and Global Oil and Gas Resources will welcome secondary extension.Fine and close oil refers to
Stored up with absorption or free state preservation in oil source rock or with oil source rock alternating layers, adjacent tight sand, dense carbonate etc.
Collect in rock, without the oil accumulation of extensive long-distance migration.The fine and close oily reservoir in China has the spies such as low hole, hypotonic, low pressure
Sign, effective exploitation face lot of challenges.The fine and close oily reservoir exploitation general oil production at initial stage in China is of a relatively high, but by reservoir properties
Difference, strata pressure is low and single well controlled reserves is few influence, production decline quickly, lapse rate up to 40%~90%, even if using
Horizontal well massive hydraulic fracture, fine and close oil reservoir primary recovery efficiency is also only 5%~10%, and massive hydraulic fracture is transformed to be formed
After Fracture Systems, subsequent waterflooding exploitation injection water is easily quickly advanced by leaps and bounds along crack, causes sudden water flooding, the crude oil of Medium Culture can not have
Effect is employed, and water flooding effectiveness is poor.Therefore fine and close oily reservoir During Natural Depletion later stage energy supplement mode and use rate are inquired into
Method is of great significance.
At present, fine and close oily reservoir is mainly using the exploitation of exhaustion formula and waterflooding extraction.The general oil production of exhaustion formula initial stage of development
It is of a relatively high, but influenced by reservoir properties are poor, strata pressure is low and single well controlled reserves is few, natural energy is extremely limited, production
Measure universal rapid decrement, the well that long 7 sections of conventional pressure breaks obtain commercial oil is averaged individual well tested production value 5.8t/d, and production yield is only
0.6~0.9t/d.Even if using horizontal well massive hydraulic fracture, fine and close oil reservoir primary recovery efficiency is also only 5%~10%.
And fine and close oily massive hydraulic fracture is transformed after forming Fracture Systems, waterflooding development injection water is easily quickly advanced by leaps and bounds along crack, causes sudden and violent property
Water logging, the crude oil of Medium Culture can not be employed effectively, and water flooding effectiveness is poor, and long 7 sections of fine and close oil is using straight well water filling, horizontal well
The combination well pattern exploitation of oil recovery, horizontal well are shown in that injection water risk is big, and water breakthrough ratio reaches 65%.
The content of the invention
In view of the deficiencies of the prior art, the method that the present invention provides a kind of fine and close oily oil reservoir of nano-fluid exploitation.
Technical scheme is as follows：
A kind of method of the fine and close oily oil reservoir of nano-fluid exploitation, step are as follows：
(1) nano-fluid slug is injected into fine and close oily oil reservoir；
The described oily oil reservoir porosity of densification is 7%-10%, permeability 0.05mD-0.1mD, and reservoir pore throat is straight
Footpath is more than 500nm；
Particle diameter is the SiO of 10nm-30nm in the nano-fluid2The mass fraction of nano particle is 0.05%-
0.1%, anion surfactant mass fraction is 0.1%-0.5%, and surplus is water；
(2) into fine and close oily oil reservoir, water filling is exploited；
Alternatively, alternately injection water and nano-fluid are exploited into fine and close oily oil reservoir.
, according to the invention it is preferred to, the anion surfactant described in step (1) is petroleum sulfonate or oil carboxylic
Hydrochlorate, it is further preferred that petroleum sodium sulfonate or oil carboxylic acid sodium.
The nano-fluid slug the controlling of injecting quantity is 0.03PV-0.05PV, nano-fluid injection rate≤1.4m/d,
More preferably 0.8m/d-1.4m/d.
, according to the invention it is preferred to, in step (2), when into fine and close oily oil reservoir, water filling is exploited, the speed of water filling
≤ 1.4m/d, more preferably 0.8m/d-1.4m/d.
When into fine and close oily oil reservoir, alternately injection water and nano-fluid are exploited, the volume ratio of water and nano-fluid >=
20：1 more preferably (20-50)：1, water filling and the speed for noting nano-fluid are 0.8m/d-1.4m/d.
The principle of the present invention is as follows：
The present invention before water flood recovery, be initially injected nano-fluid slug, be because nano-fluid can effectively by
The close oily reservoir of oily humectation is reversed to that water is wet, and Medium Culture pore throat can be entered with dialysis by being so subsequently implanted into water, and it is remaining to employ Medium Culture
Oil.In order to preferably play dialyzing, waterflood injection rate is low, is less than 1.4m/d, can also so avoid injection water edge from splitting
Sudden water flooding caused by stitching quick channelling.
The oily oil reservoir of densification that the method for the present invention is applicable in is：Reservoir porosity is 7%-10%, permeability 0.05mD-
0.1mD, reservoir pore throat diameter are more than 500nm.When pore throat in reservoirs is too small, the nano particle in nano-fluid cannot be introduced into pore throat
Inside, so that the effect that nano-fluid dialysis improves recovery ratio can not be played, the viscosity of crude in fine and close oil oil reservoir≤
10mPa.s, oil saturation >=40%.
The present invention unless otherwise specified, by this area routine operation.
The present invention has the following advantages：
1st, the close oily reservoir of oily humectation can be anyway the wet reservoir of water by present invention injection nano-fluid slug, be subsequently implanted into
Water dialysis can enter Medium Culture under the action of capillary force, so as to employ Medium Culture remaining oil.
2nd, following injected water of the present invention can supplement the stratum energy after compact oil reservoir primary oil recovery, improve recovery ratio.
Embodiment
Below by specific embodiment, the invention will be further described, but not limited to this.
Raw materials used in embodiment is convenient source, is commercial products.
Embodiment 1
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Nano-fluid slug is injected into the fine and close oily oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water drive.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The nanometer stream
Particle diameter is the SiO of 10nm-30nm in body2The mass fraction of nano particle is 0.05%, anion surfactant mass fraction
For 0.1%, surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, nano-fluid
Injection rate with water is 1.0m/d.
Embodiment 2
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Nano-fluid slug is injected into the fine and close oil oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water filling and injection nano-fluid friendship
For the displacement of reservoir oil.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The nanometer stream
Particle diameter is the SiO of 10nm-30nm in body2The mass fraction of nano particle is 0.05%, anion surfactant mass fraction
For 0.1%, surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.2PV, nano-fluid
Injection rate with water is 0.8m/d；When water filling and the injection nano-fluid alternating displacement of reservoir oil, the volume ratio of water and nano-fluid is
20：1.
Embodiment 3
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Nano-fluid slug is injected into the fine and close oily oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water drive.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The nanometer stream
Particle diameter is the SiO of 10nm-30nm in body2The mass fraction of nano particle is 0.05%, anion surfactant mass fraction
For 0.1%, surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.3PV, nano-fluid
Injection rate with water is 1.2m/d.
Embodiment 4
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Nano-fluid slug is injected into the fine and close oil oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water filling and injection nano-fluid friendship
For the displacement of reservoir oil.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The nanometer stream
Particle diameter is the SiO of 10nm-30nm in body2The mass fraction of nano particle is 0.1%, and anion surfactant mass fraction is
0.2%, surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, nano-fluid and
The injection rate of water is 1.4m/d；When water filling and the injection nano-fluid alternating displacement of reservoir oil, the volume ratio of water and nano-fluid is 50：
1。
Embodiment 5
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Nano-fluid slug is injected into the fine and close oily oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water drive.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The nanometer stream
Particle diameter is the SiO of 10nm-30nm in body2The mass fraction of nano particle is 0.2%, and anion surfactant mass fraction is
0.4%, surplus is water, and anion surfactant is petroleum sodium sulfonate, and nano-fluid injection rate is 0.1PV, nano-fluid and
The injection rate of water is 1.0m/d.
Comparative example 1
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Water drive is carried out into the fine and close oily oil reservoir of simulation, is not injected into nano-fluid slug.The internal diameter of the fine and close oil rock heart is
2.54cm, length 5cm, permeability 0.08mD, the injection rate of water is 1.0m/d.
Comparative example 2
The fine and close oil rock heart is placed in core holding unit, saturated water is first injected, is then injected into saturated oils, it is fine and close to obtain simulation
Oil reservoir；Anionic surfactant solution is injected into the fine and close oily oil reservoir of simulation and carries out the displacement of reservoir oil, then carries out water drive.
The internal diameter of the fine and close oil rock heart is 2.54cm, length 5cm, permeability 0.08mD.The anion
Surfactant qualities fraction is 0.1%, and surplus is water, and anion surfactant is petroleum sodium sulfonate, and anionic surface is lived
Property agent solution injection rate is 0.1PV, and the injection rate of anionic surfactant solution and water is 1.0m/d.
Experimental example
The obtained recovery ratio of embodiment 1-5 and comparative example 1-2 is listed in Table 1 below, as shown in Table 1：Add nano-fluid ratio
Simple waterflood recovery efficiency factor improves more than 9.6%, and more than 5.4% is improved than driving recovery ratio using anion surfactant merely.
1 experiment parameter of table and result
Claims (1)
1. a kind of method of the fine and close oily oil reservoir of nano-fluid exploitation, step are as follows：
（1）Nano-fluid slug is injected into fine and close oily oil reservoir；
The described oily oil reservoir porosity of densification is 7%-10%, permeability 0.05mD-0.1mD, and reservoir pore throat diameter is more than
500nm；
Particle diameter is the SiO of 10nm-30nm in the nano-fluid2The mass fraction of nano particle is 0.05%-0.1%, anion
Surfactant qualities fraction is 0.1%-0.5%, and surplus is water；
The nano-fluid slug the controlling of injecting quantity is 0.03PV-0.05PV；
The anion surfactant is petroleum sodium sulfonate or oil carboxylic acid sodium；
The nano-fluid injection rate is 0.8 m/d -1.4m/d；
（2）Into fine and close oily oil reservoir, water filling is exploited；
Alternatively, alternately injection water and nano-fluid are exploited into fine and close oily oil reservoir；
When into fine and close oily oil reservoir, water filling is exploited, the speed of water filling is 0.8 m/d -1.4m/d；
When into fine and close oily oil reservoir, alternately injection water and nano-fluid are exploited, the volume ratio of water and nano-fluid is（20-
50）：1.
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| CN106010493A (en) * | 2016-05-25 | 2016-10-12 | 中国石油大学(北京) | Composite oil displacement agent as well as preparation method and application thereof |
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| CN109111905B (en) * | 2018-07-17 | 2021-01-08 | 中国石油大学(北京) | Bio-based nanofluid and application thereof in improving recovery ratio of low-permeability oil reservoir |
| CN111909678A (en) * | 2020-08-25 | 2020-11-10 | 大庆中联信实石油科技开发有限公司 | Efficient nano oil displacement agent and preparation method thereof |
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| CN116285926A (en) * | 2022-12-02 | 2023-06-23 | 西安交通大学 | High-calcium and magnesium ion resistant composite nano fluid oil displacement agent and batch preparation method |
| CN117189049B (en) * | 2023-09-28 | 2024-04-23 | 大庆油田有限责任公司 | Nano profile control and flooding method suitable for low-permeability fractured reservoir |
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