CN106968655A - A kind of oil production method - Google Patents
A kind of oil production method Download PDFInfo
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- CN106968655A CN106968655A CN201710325487.4A CN201710325487A CN106968655A CN 106968655 A CN106968655 A CN 106968655A CN 201710325487 A CN201710325487 A CN 201710325487A CN 106968655 A CN106968655 A CN 106968655A
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- displacement agent
- salinity
- viscosity
- oil displacement
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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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- 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
- C09K8/588—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 polymers
Abstract
The invention provides a kind of oil production method.This method comprises the following steps：To meet following three points requirement simultaneously oil displacement agent is selected for standard：1) viscosity of oil displacement agent has single peak type feature with salinity altercation curve；2) viscosity of oil displacement agent is more than or equal to the salinity range of stratum water in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve；3) viscosity of the corresponding oil displacement agent of lowest salinity value of stratum water is not less than 100mPas in oil reservoir；Selected oil displacement agent is injected to oil reservoir by injection well, and crude oil is produced from producing well, to exploit the crude oil in oil field.The oil production method of the present invention is mainly used in exploiting the crude oil in the oil field for having undergone the waterflooding behavior stage, the viscosity of the selected oil displacement agent of method different zones in oil reservoir of the present invention produces difference, this method is compared with the oil production method of existing water drive, chemical flooding and gas drive, oil displacement agent can be expanded and involve scope in oil reservoir, Development Response of Oilfield is improved.
Description
Technical field
The present invention relates to a kind of oil production method in DP technology field, and in particular to a kind of oil reservoir portion in different permeabilities
Oil displacement agent has different viscosities feature in position, to improve the oil production method of oil recovery effect.
Background technology
In field of petroleum exploitation, the viscosity of oil displacement agent is to influence the key factor of exploitation effect and oil recovery.Typically
For, oil displacement agent viscosity is higher, then the oil reservoir scope that can be fed through to is wider, and exploitation effect and recovery ratio are better.But work as
Viscosity is increased to after certain threshold value, because the oil displacement agent of injection is excessively sticky, will reduce exploitation effect and recovery ratio.This glues
Degree threshold value and the permeability of oil reservoir are strong positively related, and general permeability is higher, and the upper viscosity limit for suitably injecting oil displacement agent is got over
It is high.For the oil reservoir of homogeneous everywhere in theory, the permeability of internal each position is equal, can directly be selected according to permeability
The suitable viscosity of injection oil displacement agent is selected, but in reality, due to deposition, the influence into the geologic(al) factor such as Tibetan and construction, actual oil
The permeability for each position hidden simultaneously is differed, or even widely different in many cases, it is virtually impossible to is found and be can adapt to institute
There is the oil displacement agent viscosity criterion of position, this is the one of the main reasons for restricting Modern oil field development effectiveness.
For above mentioned problem, what current industrial quarters was generally taken is lower limit strategy, that is, selects a unified relatively low drive
Finish viscosity.The strategy can avoid the relatively low position of permeability in oil reservoir from blocking as far as possible, but be the problem of bring, for
The higher position of permeability, because the oil displacement agent viscosity of selection is far below the viscosity threshold that can be blocked, makes these positions
Oil displacement efficiency is unsatisfactory.If the oil displacement agent viscosity selected is higher than lower limit strategy viscosity, then local oil reservoir will be had and occurred
Block, overall oil displacement efficiency is less than lower limit strategy.
After all, the technical reason of above-mentioned predicament is because existing all oil displacement agents are all difficult to show in oil reservoir
Different viscosity, to adapt to different Reservoir Permeabilities.It is therefore desirable to develop a kind of oil production method, driven in oil displacement process
Finish viscosity can change at the oil reservoir position of different permeabilities, to adapt to this permeability contrast.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of oil production method.This method is one kind not
There is different viscosities feature with oil displacement agent in the oil reservoir position of permeability, to improve the oil production method of oil recovery effect.
In order to achieve the above object, the invention provides a kind of oil production method, this method comprises the following steps：
(1) oil displacement agent is selected to meet following three points requirement simultaneously for standard：
1) viscosity of oil displacement agent has single peak type feature with salinity altercation curve；
2) viscosity of oil displacement agent with the unimodal corresponding salinity range in salinity altercation curve be more than or equal to oil reservoir in
The salinity range of layer water；
3) the lowest salinity value of stratum water corresponding oil displacement agent in the viscosity of oil displacement agent is with salinity altercation curve in oil reservoir
Viscosity be more than 100mPas；
(2) selected oil displacement agent is injected to oil reservoir by injection well, and crude oil is produced from producing well, to exploit in oil field
Crude oil.
According to the embodiment of the present invention, it is preferable that the above method further comprises step (3)：Recover the oil in producing
The monitoring of production fluid salinity is kept, such as finds that salinity has greatly changed, so that 3 points no longer met in step (1) will
Ask, then determine the distribution of formation water salinity again, and filtered out and meet with salinity altercation curve according to the viscosity of oil displacement agent
The oil displacement agent of 3 points of requirements in step (1) is repeated up to oil field to replace current oil displacement agent, so and scrapped.
In the above-mentioned methods, it is preferable that selected oil displacement agent also meets claimed below：The viscosity of oil displacement agent becomes with salinity
Change minimum of the corresponding salinity of peak value less than the distribution of formation water salinity in oil reservoir of curve.
In the above-mentioned methods, it is preferable that selected oil displacement agent is the mixture of a solvent and solute, the solvent is general
For water, the solute can be single solute or multi-component solute, and the solute is in the oil displacement agent
Weight content is 0.1% to 50%.
In the above-mentioned methods, it is preferable that the viscosity of selected oil displacement agent is with the excursion of salinity altercation in 1mPas
To 1 × 107mPa·s。
In the above-mentioned methods, it is preferable that selected oil displacement agent is NaCl matter in an atmospheric pressure, 25 DEG C of temperature, salinity
Range of viscosities under conditions of amount concentration 200ppm is 1mPas to 500mPas.In the present invention, 1ppm=1mg/L.
In the above-mentioned methods, it is preferable that the viscosity of selected oil displacement agent is with unimodal corresponding in salinity altercation curve
Salinity range is 1 × 103Mg/L to 1 × 106mg/L。
In the above-mentioned methods, it is preferable that the viscosity of selected oil displacement agent has single peak type feature with salinity altercation curve
Show as：In the case where other conditions are constant, in salinity from 1 × 103Mg/L increases to 1 × 106During mg/L, drive
The viscosity of finish successively experienced to be uprised and by two variation tendencies of high step-down, the two changes are continuous, scopes by low
1 × 103Mg/L to 1 × 106mg/L。
In the above-mentioned methods, it is preferable that parts by weight meter, the raw material composition of selected oil displacement agent includes：Host 0.1-10
82-99.8 parts of part, 0.1-5 parts of agent of association, 0-2 parts of synergist, 0-1 parts of polymer and water.
In above-mentioned oil displacement agent, it is preferable that the host is that formula is CnH2n+1O(CH2CH2O)yXM anionic surface is lived
Property agent, in formula, n is 1-38 integer, and y is 1-6 integer, and X is an electronegative acid group, and M is the metal ion of a positively charged
Or ammonium root.Wherein, it is highly preferred that the electronegative acid group can include sulfate radical, sulfonate radical, inferior sulfate radical, phosphate radical or
Benzene sulfonic acid root etc., but not limited to this；The metal ion of the positively charged includes potassium, sodium or lithium etc., but not limited to this.
In above-mentioned oil displacement agent, it is preferable that the association agent is nonionic surfactant, can specifically include polyoxy second
Ene-type nonionic surfactant and/or polyol-based non-ionic surfactant etc..
In above-mentioned oil displacement agent, it is preferable that the synergist is the anion surfactant insensitive to alkali and hard water,
12 to sodium stearyl sulfate (C can specifically be includednH2n+1SO4Na, wherein n be 12-18 integer), 12 to octadecane
Base sodium sulfonate (CnH2n+1SO3Na, wherein n are 12-18 integer) and 12 to octadecyl benzenesulfonic acid sodium (CnH2n+ 1C6H4SO3Na, wherein n are 12-18 integer) etc. in one or more of combinations, but not limited to this.
In above-mentioned oil displacement agent, it is preferable that the polymer is water-soluble polymer, it can increase the viscous of the aqueous solution
Degree, can specifically include partially hydrolyzed polyacrylamide (PHPA) class (HPAM) polymer (such as partially hydrolyzed polyacrylamide (PHPA)) or xanthan
Glue is birdsed of the same feather flock together compound (such as xanthans), but not limited to this.
According to the embodiment of the present invention, it is preferable that above-mentioned oil displacement agent is through the following steps that prepare：With weight
Part meter is measured, stirring 4-8 hours after 0-1 parts of polymer are added in 82-99.8 part water, aqueous solutions of polymers is obtained, then to described
Sequentially added in aqueous solutions of polymers 0.1-10 parts of host, association 0.1-5 part of agent and 0-2 parts of synergist after stirring 1-3 hours, so
18-30 hours are stood afterwards, the oil displacement agent composition of described variable viscosity is obtained.
In the above-mentioned methods, it is preferable that the salinity range of stratum water is 1 × 10 in the oil reservoir3Mg/L to 1 × 106mg/
L。
In the above-mentioned methods, the injection well and the producing well can be straight well or horizontal well, or a straight well
One horizontal well, and the well pattern form being made up of multiple injection wells and producing well is not restricted.
In the above-mentioned methods, it is preferable that the oil field is the oil field for having undergone the waterflooding behavior stage.It is highly preferred that described
The average oil saturation in oil field is 20% to 80%, and Produced Liquid moisture content is 0 to 95%.
In the oil production method of the present invention, the viscosity of oil displacement agent is related to the seepage flow machine of reservoir porous with salinity altercation
Reason, is explained as follows.Stratum water in original oil field for not undergoing waterflooding behavior, oil reservoir under different parts, different permeabilities
Salinity is relatively, and to undergo after waterflooding behavior, due to filtrational resistance difference, makes the water at different permeability positions in oil reservoir
Wash that degree is different, the water that high permeability position is flowed through is more, and washing degree is higher, and the water that low-permeability position is flowed through is on the low side,
Washing degree is relatively low.In view of the salinity of injection water is far below prime stratum salinity water, therefore washing degree is universal higher hypertonic
Saturating rate position salinity is relatively low, and the universal relatively low low-permeability position salinity of washing degree is higher.
The principles of science of the oil production method of the present invention is Reservoir Permeability-washing degree-stratum water after the above-mentioned water drive of analysis
The incidence relation of salinity, implementation method is the distribution according to formation water salinity, determines the viscosity of oil displacement agent with salinity altercation
The characteristic value of curve, filters out the oil displacement agent for meeting this feature value, to realize matching for oil displacement agent viscosity and formation water salinity, reaches
To matching and linkage of the oil displacement agent viscosity from different permeabilities, oil displacement efficiency is improved.
After method using the present invention, oil displacement efficiency will improve, then through after a period of time, can be it is observed that producing well
The salinity of the stratum water of output has greatly changed, in oil reservoir the lowest salinity value of stratum water in the viscosity of oil displacement agent with salinity
The viscosity of corresponding oil displacement agent is less than 100mPas in change curve, and now oil displacement efficiency will be deteriorated, and stratum water should be determined again
The distribution of salinity, selects the oil displacement agent of the 3 points of requirements met in step (1) to replace current oil displacement agent, so repeats
Until oil field is scrapped.
The oil production method provided by the present invention, it is possible to achieve oil displacement agent viscosity is in different permeabilities in oil displacement process
Oil reservoir position changes, and has novelty in seepage flow mechanism than existing methods；It can also realize that oil displacement agent is high in oil reservoir
The position viscosity of permeability is higher, and relatively low in the position viscosity of low-permeability, and such oil production method can be from porous media
The efficiency of existing oil exploitation is improved in the mechanism of seepage flow, there is novelty in application effect than existing methods.The present invention is carried
It is single that the oil production method of confession solves existing oil displacement agent viscosity characteristics, it is difficult to adapts to different parts permeability in Complex Reservoir
Difference, the problem of oil displacement efficiency is poor.The oil production method is applied to sandstone, the gravel of the common hypotonic and middle and high infiltration of water drive intermediary and later stages
Shale oil is hidden, to improve recovery ratio, especially suitable for oil reservoir stronger with plane heterogeneity in above-mentioned oil reservoir middle level.Also,
The oil production method of the present invention is compared with the oil production method of existing water drive, chemical flooding and gas drive, with the viscosity changeable in oil reservoir
The advantage of change, expands oil displacement agent and involves scope in oil reservoir, improve Development Response of Oilfield.
Brief description of the drawings
Fig. 1 is the principle and steps flow chart schematic diagram of the oil production method of the specific embodiment of the invention.
Fig. 2 be the present invention oil production method in oil displacement agent viscosity with salinity altercation curve and the schematic diagram of characteristic value.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
According to the embodiment of the present invention, it is preferable that as shown in figure 1, according to analysis Reservoir Permeability-washing journey
The principle of the incidence relation of degree-formation water salinity, the oil production method that the present invention is provided may comprise steps of：
(1) distribution (can sample and determine with Produced Liquid according to well logging) of formation water salinity in oil reservoir is determined；
(2) require to select oil displacement agent for standard to meet simultaneously at following 4 points：The viscosity of oil displacement agent is with salinity altercation curve
With single peak type feature；The viscosity of oil displacement agent is more than or equal to oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of interior stratum water；The lowest salinity value of stratum water correspondence in the viscosity of oil displacement agent is with salinity altercation curve in oil reservoir
Oil displacement agent viscosity be more than 100mPas；Oil displacement agent viscosity is with the corresponding salinity of peak value of salinity altercation curve less than oil
The minimum of the distribution of formation water salinity in hiding；
The viscosity of oil displacement agent is with salinity altercation curve and characteristic value schematic diagram as shown in Fig. 2 in figure：μ0For salinity M0=
Oil displacement agent viscosity during 50ppm, μ1For oil displacement agent peak viscosity, M1Corresponding salinity, μ during for oil displacement agent peak viscosity2For salinity
M2=1 × 106Oil displacement agent viscosity during ppm；
For " viscosity of oil displacement agent is more than or equal in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of stratum water；Oil displacement agent viscosity is with the corresponding salinity of peak value of salinity altercation curve less than formation water salinity in oil reservoir
Distribution minimum " explanation be：For example, as shown in Fig. 2 oil displacement agent viscosity with salinity altercation curve unimodal correspondence
Salinity range be M0To M2, the corresponding salinity of peak value is M1；The salinity range of stratum water is M in oil reservoir3To M4；Then need to meet M0
＜ M3And M2≥M4(i.e. the viscosity of oil displacement agent is more than or equal to oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of interior stratum water), and also need to meet M1<M3(i.e. oil displacement agent viscosity with salinity altercation curve the corresponding salt of peak value
Minimum of the degree less than the distribution of formation water salinity in oil reservoir)；
(3) selected oil displacement agent is injected to oil reservoir by injection well, and crude oil is produced from producing well, to exploit in oil field
Crude oil；
(4) recover the oil and the monitoring of production fluid salinity is kept in producing, such as find that salinity has greatly changed, then determine again
The distribution of formation water salinity, and four met in step (2) are filtered out with salinity altercation curve according to the viscosity of oil displacement agent
The oil displacement agent that point is required is repeated up to oil field to replace current oil displacement agent, so and scrapped.
Using the oil production method of the present invention, it is possible to achieve oil reservoir of the oil displacement agent viscosity in different permeabilities in oil displacement process
Position changes, and makes oil displacement agent higher in the position viscosity of oil reservoir medium to high permeable rate, and low-permeability position viscosity compared with
Low, the oil production method can improve the efficiency of existing oil exploitation from the mechanism of Porous Media.
The present invention is explained in more detail referring to specific embodiment, it is the mesh for explanation to provide these examples
, and it is not intended to limit the present invention.
Embodiment 1
With Numerical Method Study, oil reservoir block is using the effect of the oil production method of the present invention, and wherein oil deposit parameter is such as
Under：Core intersection 10m, area 10km2, porosity 28%, permeability 20-1000mD, initial oil saturation 72%, crude oil
Lower viscosity 15mPas, prime stratum water salinity (salinity) 20000ppm, injection salinity water 300ppm.
After the water drive of 0.5 times of pore volume, average oil saturation is 54%, and difference occurs for formation water salinity
Change, scope is 2500ppm-18000ppm.Now waterflooding effect is deteriorated, and production fluid moisture content 86%, rate of oil production is 0.4%.
Certain oil displacement agent is chosen, in parts by weight, its raw material composition is：10 parts of fatty alcohol-ether sodium sulfate, polyethylene glycol are stearic
0.1 part of acid esters, 0.1 part of lauryl sodium sulfate, 0.05 part of the partially hydrolyzed polyacrylamide (PHPA) and water of 15,000,000 molecular weight
89.75 parts；The oil displacement agent through the following steps that prepare：According to above-mentioned weight ratio, 1500 are added in water very much
Stirred 6 hours after the partially hydrolyzed polyacrylamide (PHPA) of amount, then sequentially add fatty alcohol-ether sodium sulfate, polyethylene glycol stearate
Stirred 2 hours with after lauryl sodium sulfate, then stand 24 hours, obtain a clear transparent solutions, be described oil displacement agent.
The viscosity of the oil displacement agent is with the characteristic value of salinity altercation curve：μ0=8mPas, μ1=310mPas, μ2=18mPas,
M0=50ppm, M1=2400ppm, M2=1 × 106Ppm, while the lowest salinity value 2500ppm of stratum water is in the drive in oil reservoir
The viscosity of finish is 280mPas with the viscosity of corresponding oil displacement agent in salinity altercation curve.Inject 0.2 times of hole of the oil displacement agent
After volume, initial stage, production fluid moisture content was down to 33%, and rate of oil production rises to 1.5%, but latter stage effect is deteriorated, production fluid moisture content
65% is risen to, rate of oil production is down to 0.7%, and formation water salinity distribution is changed into 4000ppm-12000ppm, now ground in oil reservoir
Layer water lowest salinity value 4000ppm in the viscosity of the oil displacement agent is with salinity altercation curve the viscosity of corresponding oil displacement agent be only
65mPas, desired 100mPas is chosen less than oil displacement agent, therefore should change oil displacement agent.
Again certain oil displacement agent is chosen, in parts by weight, its raw material composition is：0.1 part of fatty alcohol ether sodium sulfonate, nonyl phenol gather
5 parts of oxygen vinethene, 2 parts of dodecyl sodium sulfate, 0.1 part of the partially hydrolyzed polyacrylamide (PHPA) and water 92.8 of 18,000,000 molecular weight
Part；The oil displacement agent through the following steps that prepare：According to above-mentioned weight ratio, the portion of 18,000,000 molecular weight is added in water
Divide after hydrolyzed polyacrylamide and stir 8 hours, then sequentially add fatty alcohol ether sodium sulfonate, NPE and 12
Stirred 3 hours after sodium alkyl sulfonate, then stand 30 hours, obtain a clear transparent solutions, be described oil displacement agent.The displacement of reservoir oil
The viscosity of agent is with the characteristic value of salinity altercation curve, μ0=10mPas, μ1=380mPas, μ2=19mPas, M0=
50ppm, M1=3800ppm, M2=1 × 106Ppm, while the lowest salinity value 4000ppm of stratum water is in the oil displacement agent in oil reservoir
Viscosity with corresponding oil displacement agent in salinity altercation curve viscosity be 330mPas.Inject 0.2 times of pore volume of the oil displacement agent
Afterwards, production fluid at initial stage moisture content is down to 39%, and rate of oil production rises to 1.3%, but latter stage effect is deteriorated, and production fluid moisture content rises to
71%, rate of oil production is down to 0.6%, and formation water salinity distribution is changed into 6000ppm-10000ppm, now stratum water in oil reservoir
Lowest salinity value 6000ppm in the viscosity of the oil displacement agent is with salinity altercation curve the viscosity of corresponding oil displacement agent be only
77mPas, desired 100mPas is chosen less than oil displacement agent, therefore should change oil displacement agent.
Again certain oil displacement agent is chosen, in parts by weight, its raw material composition is：0.3 part of fatty alcohol ether benzene sulfonic acid potassium, dehydration mountain
97.8 parts of 0.4 part of pears alcohol laurate, 0.5 part of neopelex, 1 part of xanthans and water；The oil displacement agent is to pass through
Prepared by following steps：According to above-mentioned weight ratio, add after xanthans and stir 4 hours in water, then sequentially add fat
Stirred 1 hour after fat alcohol ether benzene sulfonic acid potassium, anhydrous sorbitol laurate and neopelex, then stand 18 hours,
A clear transparent solutions are obtained, are described oil displacement agent.The viscosity of the oil displacement agent is with the characteristic value of salinity altercation curve, μ0
=12mPas, μ1=330mPas, μ2=22mPas, M0=50ppm, M1=5800ppm, M2=1 × 106Ppm, simultaneously
The lowest salinity value 6000ppm of stratum water corresponding oil displacement agents in the viscosity of the oil displacement agent is with salinity altercation curve in oil reservoir
Viscosity is 240mPas.Inject after 0.2 times of pore volume of the oil displacement agent, initial stage, production fluid moisture content was down to 46%, rate of oil production
1.1% is risen to, but latter stage effect is deteriorated, and production fluid moisture content rises to 77%, and rate of oil production is down to 0.6%, formation water salinity
Distribution is changed into 8000ppm-9000ppm.
According to this oil production method, by above three-wheel regulating measures, accumulation injection 0.6 times of pore volume of oil displacement agent, it is contemplated that
Improve waterflood recovery efficiency factor 21%.
In order to which to more solito oil production method, the present invention has carried out three groups of comparative simulation experiments, is passed through with this method identical
After the water drive for crossing 0.5 times of pore volume, three kinds of displacement of reservoir oils that viscosity is 50mPas, 100mPas, 150mPas are injected separately into
Agent, these three oil displacement agents are respectively concentration 200ppm, 250ppm and 300ppm 18,000,000 molecular weight partial hydrolysis polyacrylamides
The aqueous solution of amine.Injection rate is respectively 0.6 times of pore volume.Simulated experiment result shows, the oil displacement agent of above-mentioned three kinds of viscosity,
By the injection of 0.6 times of pore volume, waterflood recovery efficiency factor 11%, 8.3% and 7.9% is respectively increased.
As can be seen that the oil production method of the present invention can carry out match control to the oil displacement agent viscosity of oil reservoir different parts,
Oil recovery is greatly improved compared to existing conventional oil production method.
Claims (10)
1. a kind of oil production method, this method comprises the following steps：
(1) oil displacement agent is selected to meet following three points requirement simultaneously for standard：
1) viscosity of oil displacement agent has single peak type feature with salinity altercation curve；
2) viscosity of oil displacement agent is more than or equal to stratum water in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
Salinity range；
3) in oil reservoir the lowest salinity value of stratum water in the viscosity of oil displacement agent is with salinity altercation curve corresponding oil displacement agent it is viscous
Spend for more than 100mPas；
(2) selected oil displacement agent is injected to oil reservoir by injection well, and crude oil is produced from producing well, to exploit the original in oil field
Oil；
Preferably, the above method further comprises step (3)：Recover the oil and the monitoring of production fluid salinity is kept in producing, such as find salt
Degree has greatly changed, so that no longer meeting 3 points of requirements in step (1), then determines the distribution of formation water salinity again
Scope, and filtered out with salinity altercation curve according to the viscosity of oil displacement agent the oil displacement agent of the 3 points of requirements met in step (1) with
Current oil displacement agent is replaced, oil field is so repeated up to and scraps.
2. oil production method according to claim 1, wherein, selected oil displacement agent also meets claimed below：Oil displacement agent
Viscosity is less than the minimum of the distribution of formation water salinity in oil reservoir with the corresponding salinity of peak value of salinity altercation curve.
3. oil production method according to claim 1, wherein, selected oil displacement agent is the mixture of a solvent and solute,
The solvent is water, and the solute is single solute or multi-component Solute, and weight of the solute in the oil displacement agent
Content is 0.1% to 50%.
4. oil production method according to claim 1, wherein, the viscosity of selected oil displacement agent with salinity altercation change model
1mPas is trapped among to 1 × 107mPa·s；Preferably, selected oil displacement agent is in an atmospheric pressure, 25 DEG C of temperature, salinity
Range of viscosities under conditions of NaCl mass concentrations 200ppm is 1mPas to 500mPas.
5. oil production method according to claim 1, wherein, the viscosity of selected oil displacement agent is with salinity altercation curve
Unimodal corresponding salinity range is 1 × 103Mg/L to 1 × 106mg/L。
6. oil production method according to claim 1 or 5, wherein, the viscosity of selected oil displacement agent is with salinity altercation curve
With showing as single peak type feature：In the case where other conditions are constant, in salinity from 1 × 103Mg/L increases to 1 ×
106During mg/L, the viscosity of oil displacement agent successively experienced to be uprised and by two variation tendencies of high step-down by low, the two
Change is continuous, and scope is 1 × 103Mg/L to 1 × 106mg/L。
7. the oil production method according to any one of claim 1-6, wherein, in parts by weight, selected oil displacement agent
Raw material composition includes：0.1-10 parts of host, 0.1-5 parts of agent of association, 0-2 parts of synergist, 0-1 parts of polymer and water 82-99.8
Part.
8. oil production method according to claim 7, wherein, the host is that formula is CnH2n+1O(CH2CH2O)yXM the moon
In ionic surface active agent, formula, n is 1-38 integer, and y is 1-6 integer, and X is an electronegative acid group, and M is a positively charged
Metal ion or ammonium root；Preferably, the electronegative acid group includes sulfate radical, sulfonate radical, inferior sulfate radical, phosphate radical or benzene
Sulfonate radical, the metal ion of the positively charged includes potassium, sodium or lithium；
The association agent is nonionic surfactant；Preferably, the association agent is lived including polyoxyethylene-type non-ionic surface
Property agent and/or polyol-based non-ionic surfactant；
The synergist is the anion surfactant insensitive to alkali and hard water；Preferably, the synergist includes 12
To sodium stearyl sulfate, 12 to sodium stearyl sulfonate and 12 one or more into octadecyl benzenesulfonic acid sodium
Combination；
The polymer is water-soluble polymer；Preferably, the polymer is birdsed of the same feather flock together compound including partially hydrolyzed polyacrylamide (PHPA)
Or xanthans is birdsed of the same feather flock together compound.
9. oil production method according to claim 1, wherein, the salinity range of stratum water is 1 × 10 in the oil reservoir3mg/L
To 1 × 106mg/L。
10. oil production method according to claim 1, wherein, the oil field is the oil field for having undergone the waterflooding behavior stage；It is excellent
Selection of land, the average oil saturation in the oil field is 20% to 80%, and Produced Liquid moisture content is 0 to 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710325487.4A CN106968655B (en) | 2017-05-10 | 2017-05-10 | A kind of oil production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710325487.4A CN106968655B (en) | 2017-05-10 | 2017-05-10 | A kind of oil production method |
Publications (2)
| Publication Number | Publication Date |
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