CN106968655B - A kind of oil production method - Google Patents
A kind of oil production method Download PDFInfo
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- CN106968655B CN106968655B CN201710325487.4A CN201710325487A CN106968655B CN 106968655 B CN106968655 B CN 106968655B CN 201710325487 A CN201710325487 A CN 201710325487A CN 106968655 B CN106968655 B CN 106968655B
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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 present invention provides a kind of oil production methods.Method includes the following steps: requiring to be that standard selects oil displacement agent to meet following three points simultaneously: 1) viscosity of oil displacement agent has single peak type feature with salinity altercation curve；2) viscosity of oil displacement agent is greater than or equal to the salinity range of water flooding in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve；3) lowest salinity of water flooding is worth the viscosity of corresponding oil displacement agent not less than 100mPas in oil reservoir；Selected oil displacement agent is injected to oil reservoir by injection well, and produces crude oil from producing well, to exploit the crude oil in oil field.Oil production method of the invention is mainly used for exploiting the crude oil undergone in the oil field in waterflooding behavior stage, the viscosity of the selected oil displacement agent of method of the invention different zones in oil reservoir generates 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 range in oil reservoir, improve Development Response of Oilfield.
Description
Technical field
The present invention relates to a kind of oil production methods 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 technique
In field of petroleum exploitation, the viscosity of oil displacement agent is an important factor for influencing exploitation effect and oil recovery.Generally
For, oil displacement agent viscosity is higher, then the oil reservoir range that can be fed through to is wider, and exploitation effect and recovery ratio are better.But work as
After viscosity is increased to certain threshold value, since the oil displacement agent of injection is excessively sticky, reduce exploitation effect and recovery ratio.This is viscous
Degree threshold value and the permeability of oil reservoir be it is strong positively related, general permeability is higher, is suitable for injecting the upper viscosity limit of oil displacement agent to get over
It is high.For the theoretically oil reservoir of homogeneous everywhere, the permeability of internal each position be it 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, at the influence of the geologic(al) factors such as hiding and construction, practical oil
The permeability of each position of hiding is not identical or even widely different in many cases, it is virtually impossible to find and can adapt to institute
Have the oil displacement agent viscosity criterion of position, this be restrict Modern oil field development effectiveness the main reason for one of.
In response to the above problems, what industry generally took at present is lower limit strategy, that is, selects a unified lower drive
Finish viscosity.The strategy can avoid the lower position of permeability in oil reservoir from blocking as far as possible, but the problem of bringing is, for
The higher position of permeability makes these positions since the oil displacement agent viscosity of selection is far below the viscosity threshold that can be blocked
Oil displacement efficiency is unsatisfactory.If the oil displacement agent viscosity selected is higher than lower limit strategy viscosity, local oil reservoir will be had and occurred
Blocking, overall oil displacement efficiency are lower 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.
Summary of the invention
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of oil production methods.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 present invention provides a kind of oil production methods, method includes the following steps:
(1) it requires to be that standard selects oil displacement agent to meet following three points simultaneously:
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 greater than or equal to oil reservoir in
The salinity range of layer water；
3) in oil reservoir water flooding lowest salinity value oil displacement agent viscosity with corresponding oil displacement agent in salinity altercation curve
Viscosity be 100mPas or more；
(2) selected oil displacement agent is injected to oil reservoir by injection well, and produces crude oil from producing well, to exploit in oil field
Crude oil.
Specific embodiment according to the present invention, it is preferable that the above method further comprises step (3): in production of recovering the oil
The monitoring of production fluid salinity is kept, such as finds that salinity has greatly changed, so that want at 3 points no longer met in step (1)
It asks, then measures the distribution of formation water salinity again, and filtered out and met 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 so repeated up to oil field and scraps to replace current oil displacement agent.
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 lower 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, and the solvent is general
For water, the solute can be single solute, be also possible to 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 variation range 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 themselves in that 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 by low two variation tendencies got higher and be lower by height, the two variations are continuous, ranges
1 × 103Mg/L to 1 × 106mg/L。
In the above-mentioned methods, it is preferable that the raw material composition of parts by weight meter, selected oil displacement agent includes: host agent 0.1-10
Part, agent 0.1-5 parts of association, 0-2 parts of synergist, 0-1 parts of polymer and 82-99.8 parts of water.
In above-mentioned oil displacement agent, it is preferable that the host agent is that general formula is CnH2n+1O(CH2CH2O)yThe anionic surface of XM is living
Property agent, in formula, n is the integer of 1-38, and y is the integer of 1-6, and X is an electronegative acid group, and M is a positively charged metal ion
Or ammonium root.Wherein, it is highly preferred that the electronegative acid group may include sulfate radical, sulfonate radical, inferior sulfate radical, phosphate radical or
Benzene sulfonic acid root etc., but not limited to this；The positively charged metal ion 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 anionic surfactant insensitive to alkali and hard water,
12 be can specifically include to sodium stearyl sulfate (CnH2n+1SO4Na, wherein n be 12-18 integer), 12 to octadecane
Base sodium sulfonate (CnH2n+1SO3Na, wherein n is the integer of 12-18) and 12 to octadecyl benzenesulfonic acid sodium (CnH2n+ 1C6H4SO3Na, wherein n be 12-18 integer) etc. one or more of combination, but not limited to this.
In above-mentioned oil displacement agent, it is preferable that the polymer is water-soluble polymer, can increase the viscous of aqueous solution
Degree, can specifically include partially hydrolyzed polyacrylamide (PHPA) class (HPAM) polymer (such as partially hydrolyzed polyacrylamide (PHPA)) or xanthan
Glue quasi polymer (such as xanthan gum) etc., but not limited to this.
Specific embodiment according to the present invention, it is preferable that above-mentioned oil displacement agent is through the following steps that preparation: with weight
Part meter is measured, is stirred 4-8 hours after being added polymer 0-1 parts in 82-99.8 parts of water, obtains aqueous solutions of polymers, then Xiang Suoshu
1-3 hours are stirred after sequentially adding 0.1-10 parts of host agent, agent 0.1-5 parts and 0-2 parts of synergist of association in aqueous solutions of polymers, so
18-30 hours are stood afterwards, obtains the oil displacement agent composition of the variable viscosity.
In the above-mentioned methods, it is preferable that the salinity range of water flooding 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, be also possible to horizontal well or a straight well
One horizontal well, and with no restriction to the well pattern form being made of multiple injection wells and producing well.
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 oil production method of the 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.Water flooding for not undergoing the original oil field of waterflooding behavior, in oil reservoir under different parts, different permeabilities
Salinity is relatively, and after undergoing waterflooding behavior, due to filtrational resistance difference, to make the water at different permeabilities position in oil reservoir
Wash that degree is different, the water that high permeability position flows through is more, and washing degree is higher, and the water that low-permeability position flows through is on the low side,
Washing degree is lower.It is far below prime stratum salinity water in view of the salinity of injection water, therefore washing degree is universal higher hypertonic
Saturating rate position salinity is lower, and generally lower low-permeability position salinity is higher for washing degree.
The principles of science of oil production method of the invention is Reservoir Permeability-washing degree-water flooding after the above-mentioned water drive of analysis
The incidence relation of salinity, implementation method are the distributions according to formation water salinity, determine 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 the matching of oil displacement agent viscosity and formation water salinity, reaches
To oil displacement agent viscosity and the matching of different permeabilities and linkage, oil displacement efficiency is improved.
After method of the invention, oil displacement efficiency will improve, can be it is observed that producing well after a period of time
The salinity of the water flooding of output has greatly changed, and the lowest salinity value of water flooding is in the viscosity of oil displacement agent with salinity in oil reservoir
The viscosity of corresponding oil displacement agent is lower than 100mPas in change curve, and oil displacement efficiency will be deteriorated at this time, should measure water flooding again
The distribution of salinity is selected the oil displacement agent for meeting 3 points of requirements in step (1) to replace current oil displacement agent, is so repeated
Until oil field is scrapped.
Oil displacement agent viscosity may be implemented in oil displacement process in different permeabilities in the oil production method provided through the invention
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 the position viscosity in low-permeability is lower, and such oil production method can be from porous media
The efficiency of existing oil exploitation is improved in the mechanism of seepage flow, and there is in application effect novelty than existing methods.The present invention mentions
It is single that the oil production method of confession solves existing oil displacement agent viscosity characteristics, it is difficult to adapt to different parts permeability in Complex Reservoir
Difference, the problem of oil displacement efficiency difference.The oil production method is suitable for common hypotonic and middle and high infiltration sandstone, the gravel of water drive intermediary and later stages
Shale oil hiding, to improve recovery ratio, for especially suitable with the stronger oil reservoir of plane heterogeneity in above-mentioned oil reservoir middle layer.Also,
Oil production method of the invention has compared with the oil production method of existing water drive, chemical flooding and gas drive in oil reservoir medium viscosity changeable
The advantage of variation expands oil displacement agent and involves range in oil reservoir, improves Development Response of Oilfield.
Detailed description of the invention
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 is oil displacement agent viscosity in oil production method of the invention with salinity altercation curve and the schematic diagram of characteristic value.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Specific embodiment according to the present invention, it is preferable that as shown in Figure 1, according to analysis Reservoir Permeability-washing journey
The principle of degree-formation water salinity incidence relation, oil production method provided by the invention may comprise steps of:
(1) distribution (can determine according to well logging and Produced Liquid sampling) of formation water salinity in oil reservoir is determined；
(2) require to be that standard selects oil displacement agent 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 greater than or equal to oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of interior water flooding；The lowest salinity value of water flooding is in the viscosity of oil displacement agent with corresponding in salinity altercation curve in oil reservoir
Oil displacement agent viscosity be 100mPas or more；Oil displacement agent viscosity is with the corresponding salinity of peak value of salinity altercation curve lower 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 when 50ppm, μ1For oil displacement agent peak viscosity, M1Corresponding salinity, μ when for oil displacement agent peak viscosity2For salinity
M2=1 × 106Oil displacement agent viscosity when ppm；
For " viscosity of oil displacement agent is greater than or equal in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of water flooding；Oil displacement agent viscosity is with the corresponding salinity of peak value of salinity altercation curve lower 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 water flooding is M in oil reservoir3To M4；It then needs to meet M0
< M3And M2≥M4(i.e. the viscosity of oil displacement agent is greater than or equal to oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
The salinity range of interior water flooding), 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 lower than the distribution of formation water salinity in oil reservoir)；
(3) selected oil displacement agent is injected to oil reservoir by injection well, and produces crude oil from producing well, to exploit in oil field
Crude oil；
(4) it recovers the oil and keeps the monitoring of production fluid salinity in producing, such as find that salinity has greatly changed, then measures 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 requires so is repeated up to oil field and scraps to replace current oil displacement agent.
Using oil production method of the invention, oil displacement agent viscosity may be implemented in oil displacement process in the oil reservoir of different permeabilities
Position changes, and keeps oil displacement agent higher in the position viscosity of oil reservoir medium to high permeable rate, and the position viscosity of low-permeability compared with
Low, which 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, providing these examples is the mesh for explanation
, and it is not intended to limit the present invention.
Embodiment 1
The effect of oil production method of the invention is used with Numerical Method Study oil reservoir block, 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 inject 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, range 2500ppm-18000ppm.Waterflooding effect is deteriorated at this time, production fluid moisture content 86%, rate of oil production 0.4%.
Certain oil displacement agent is chosen, in parts by weight, raw material composition are as follows: 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, 15,000,000 molecular weight 0.05 part of partially hydrolyzed polyacrylamide (PHPA) and water
89.75 parts；The oil displacement agent is through the following steps that preparation: according to above-mentioned weight ratio, it is sub very much that 1500 being added in water
It is stirred 6 hours after the partially hydrolyzed polyacrylamide (PHPA) of amount, then sequentially adds fatty alcohol-ether sodium sulfate, polyethylene glycol stearate
It is stirred 2 hours with after lauryl sodium sulfate, then stands 24 hours, obtain a clear transparent solutions, the as 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, at the same in oil reservoir water flooding lowest salinity value 2500ppm in the drive
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 is 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 becomes 4000ppm-12000ppm, at this time ground in oil reservoir
Layer water lowest salinity value 4000ppm be only with the viscosity of corresponding oil displacement agent in salinity altercation curve in the viscosity of the oil displacement agent
65mPas chooses desired 100mPas lower than oil displacement agent, therefore should replace oil displacement agent.
Again certain oil displacement agent is chosen, in parts by weight, raw material composition are as follows: 0.1 part of fatty alcohol ether sodium sulfonate, nonyl phenol are poly-
5 parts of ethylene oxide ether, 2 parts of dodecyl sodium sulfate, 18,000,000 molecular weight 0.1 part of partially hydrolyzed polyacrylamide (PHPA) and water 92.8
Part；The oil displacement agent is through the following steps that preparation: according to above-mentioned weight ratio, the portion of 18,000,000 molecular weight being added in water
It is stirred 8 hours after dividing hydrolyzed polyacrylamide, then sequentially adds fatty alcohol ether sodium sulfonate, nonylphenol polyoxyethylene ether and 12
It is stirred 3 hours after sodium alkyl sulfonate, then stands 30 hours, obtain a clear transparent solutions, the as oil displacement agent.The displacement of reservoir oil
The viscosity of agent is μ with the characteristic value of salinity altercation curve0=10mPas, μ1=380mPas, μ2=19mPas, M0=
50ppm, M1=3800ppm, M2=1 × 106Ppm, at the same in oil reservoir water flooding lowest salinity value 4000ppm in the oil displacement agent
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, initial stage production fluid 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 becomes 6000ppm-10000ppm, at this time water flooding in oil reservoir
Lowest salinity value 6000ppm be only with the viscosity of corresponding oil displacement agent in salinity altercation curve in the viscosity of the oil displacement agent
77mPas chooses desired 100mPas lower than oil displacement agent, therefore should replace oil displacement agent.
Again certain oil displacement agent is chosen, in parts by weight, raw material composition are as follows: 0.3 part of fatty alcohol ether benzene sulfonic acid potassium, dehydration mountain
0.4 part of pears alcohol laurate, 0.5 part of neopelex, 1 part of xanthan gum and 97.8 parts of water；The oil displacement agent is to pass through
Following steps preparation: according to above-mentioned weight ratio, being stirred 4 hours after xanthan gum is added in water, then sequentially add rouge
It is stirred 1 hour after fat alcohol ether benzene sulfonic acid potassium, anhydrous sorbitol laurate and neopelex, then stands 18 hours,
Obtain a clear transparent solutions, the as oil displacement agent.The viscosity of the oil displacement agent is μ with the characteristic value of salinity altercation curve0
=12mPas, μ1=330mPas, μ2=22mPas, M0=50ppm, M1=5800ppm, M2=1 × 106Ppm, simultaneously
The lowest salinity value 6000ppm of water flooding is in the viscosity of the oil displacement agent with corresponding oil displacement agent in salinity altercation curve in oil reservoir
Viscosity is 240mPas.After injecting 0.2 times of pore volume of the oil displacement agent, initial stage production fluid moisture content is down to 46%, rate of oil production
1.1% is risen to, but latter stage effect is deteriorated, production fluid moisture content rises to 77%, and rate of oil production is down to 0.6%, formation water salinity
Distribution becomes 8000ppm-9000ppm.
According to this oil production method, by the 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, in warp identical with this method
After crossing the water drive of 0.5 times of pore volume, it is injected separately into three kinds of displacement of reservoir oils that viscosity is 50mPas, 100mPas, 150mPas
Agent, these three oil displacement agents are respectively the 18000000 molecular weight partial hydrolysis polyacrylamides of concentration 200ppm, 250ppm and 300ppm
The aqueous solution of amine.Injection rate is respectively 0.6 times of pore volume.Simulated experiment the result shows that, 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 oil production method of the invention can the oil displacement agent viscosity to oil reservoir different parts carry out match control,
Oil recovery is greatly improved compared to existing conventional oil production method.
Claims (18)
1. a kind of oil production method, method includes the following steps:
(1) it requires to be that standard selects oil displacement agent to meet following three points simultaneously:
1) viscosity of oil displacement agent has single peak type feature with salinity altercation curve；
2) viscosity of oil displacement agent is greater than or equal to water flooding in oil reservoir with the unimodal corresponding salinity range in salinity altercation curve
Salinity range；
3) in oil reservoir water flooding lowest salinity value oil displacement agent viscosity in salinity altercation curve corresponding oil displacement agent it is viscous
Degree is 100mPas or more；
(2) selected oil displacement agent is injected to oil reservoir by injection well, and produces crude oil from producing well, to exploit the original in oil field
Oil.
2. oil production method according to claim 1, wherein this method further comprises step (3): being kept in production of recovering the oil
The monitoring of production fluid salinity such as finds that salinity has greatly changed, so that no longer meet 3 points of requirements in step (1),
The distribution of formation water salinity is then measured again, and is filtered out according to the viscosity of oil displacement agent with salinity altercation curve and met step
(1) oil displacement agent of 3 points of requirements in is so repeated up to oil field and scraps to replace current oil displacement agent.
3. oil production method according to claim 1, wherein selected oil displacement agent also meets claimed below: oil displacement agent
Viscosity is lower than the minimum of the distribution of formation water salinity in oil reservoir with the corresponding salinity of peak value of salinity altercation curve.
4. 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%.
5. oil production method according to claim 1, wherein the viscosity of selected oil displacement agent with salinity altercation variation model
1mPas is trapped among to 1 × 107mPa·s。
6. oil production method according to claim 5, wherein selected oil displacement agent is in an atmospheric pressure, 25 DEG C of temperature, salt
Range of viscosities under conditions of degree is NaCl mass concentration 200ppm is 1mPas to 500mPas.
7. oil production method according to claim 1, wherein the viscosity of selected oil displacement agent is in salinity altercation curve
Unimodal corresponding salinity range is 1 × 103Mg/L to 1 × 106mg/L。
8. oil production method according to claim 1, wherein the viscosity of selected oil displacement agent has with salinity altercation curve
Single peak type feature shows themselves in that in the case where other conditions are constant, in salinity from 1 × 103Mg/L increases to 1 × 106Mg/L's
In the process, the viscosity of oil displacement agent successively experienced by low two variation tendencies got higher and be lower by height, the two variations are to connect
Continuous, range is 1 × 103Mg/L to 1 × 106mg/L。
9. oil production method according to claim 7, wherein the viscosity of selected oil displacement agent has with salinity altercation curve
Single peak type feature shows themselves in that in the case where other conditions are constant, in salinity from 1 × 103Mg/L increases to 1 × 106Mg/L's
In the process, the viscosity of oil displacement agent successively experienced by low two variation tendencies got higher and be lower by height, the two variations are to connect
Continuous, range is 1 × 103Mg/L to 1 × 106mg/L。
10. oil production method according to claim 1 to 9, wherein in parts by weight, selected oil displacement agent
Raw material composition includes: 0.1-10 parts of host agent, agent 0.1-5 parts of association, 0-2 parts of synergist, 0-1 parts of polymer and water 82-99.8
Part.
11. oil production method according to claim 10, wherein the host agent is that general formula is CnH2n+1O(CH2CH2O)yXM's
Anionic surfactant, in formula, n is the integer of 1-38, and y is the integer of 1-6, and X is an electronegative acid group, M be a band just
The metal ion or ammonium root of electricity；
The association agent is nonionic surfactant；
The synergist is the anionic surfactant insensitive to alkali and hard water；The polymer is water-soluble polymer.
12. oil production method according to claim 11, wherein the electronegative acid group includes sulfate radical, sulfonate radical, Asia
Sulfate radical, phosphate radical or benzene sulfonic acid root, the positively charged metal ion include potassium, sodium or lithium.
13. oil production method according to claim 11, wherein the association agent includes that polyoxyethylene-type non-ionic surface is living
Property agent and/or polyol-based non-ionic surfactant.
14. oil production method according to claim 11, wherein the synergist include 12 to sodium stearyl sulfate,
12 to sodium stearyl sulfonate and 12 to the combination of one or more of octadecyl benzenesulfonic acid sodium.
15. oil production method according to claim 11, wherein the polymer includes that partially hydrolyzed polyacrylamide (PHPA) is birdsed of the same feather flock together
Close object or xanthan gum quasi polymer.
16. oil production method according to claim 1, wherein the salinity range of water flooding is 1 × 10 in the oil reservoir3mg/L
To 1 × 106mg/L。
17. oil production method according to claim 1, wherein the oil field is the oil field for having undergone the waterflooding behavior stage.
18. oil production method according to claim 17, wherein the average oil saturation in the oil field arrives for 20%
80%, 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 |
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