CN109736764A - The remodeling method and device of fine and close oil reservoir wettability - Google Patents
The remodeling method and device of fine and close oil reservoir wettability Download PDFInfo
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- CN109736764A CN109736764A CN201811579646.4A CN201811579646A CN109736764A CN 109736764 A CN109736764 A CN 109736764A CN 201811579646 A CN201811579646 A CN 201811579646A CN 109736764 A CN109736764 A CN 109736764A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007634 remodeling Methods 0.000 title claims abstract description 21
- 239000003921 oil Substances 0.000 claims abstract description 65
- 239000004094 surface-active agent Substances 0.000 claims abstract description 65
- 239000011435 rock Substances 0.000 claims abstract description 54
- 239000010779 crude oil Substances 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
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- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 8
- 230000006378 damage Effects 0.000 claims abstract description 8
- 238000000280 densification Methods 0.000 claims abstract description 8
- 208000014674 injury Diseases 0.000 claims abstract description 8
- 238000005213 imbibition Methods 0.000 claims description 31
- 238000011084 recovery Methods 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 21
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 15
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 15
- 150000002191 fatty alcohols Chemical class 0.000 claims description 14
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 12
- 150000001336 alkenes Chemical class 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 11
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 9
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- 238000006116 polymerization reaction Methods 0.000 claims description 7
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- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 238000009736 wetting Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
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Abstract
This application provides the remodeling methods and device of a kind of fine and close oily reservoir wettability, method includes the following steps: choosing surfactant, the wet reservoir of oil can be switched to water-wet reservoir by the surfactant, and can be rinsed out by crude oil.Stratum is pumped into after the surfactant is mixed with fracturing fluid.Bored well in the given time promotes the wet reservoir of oil to be reversed to water-wet reservoir, and realize oil and water displacement so that the surfactant comes into full contact with rock.Drive a well the row's of returning production, so that crude oil washes out the surfactant in reservoir, and then it is oily wet to revert to rock, promotes the row of returning, and reduces injury of the fracturing fluid to reservoir.The remodeling method and device of the oily reservoir wettability of densification of the invention, which can effectively improve fine and close oily oil reservoir and return row, to be led, and fine and close oily oil reservoir yield is improved.
Description
Technical field
The application belongs to technical field of petroleum extraction, and in particular to a kind of remodeling method and dress of fine and close oily reservoir wettability
It sets.
Background technique
Fine and close oil reservoir rich reserves, it has also become the important energy reliever relay in China, but due to fine and close oily reservoir hole seep compared with
Reasons, the tar productivities such as low, pressure failure is fast, and reservoir development degree is low are generally lower.In order to improve the development degree of fine and close oil, people
Surfactant is added in fracturing fluid, it can reduce interfacial tension and change reservoir rock wetability, realize grease
Displacement, displacement comes out under the action of the crude oil in hole is relied on capillary force during bored well.
But after becoming water-wet reservoir due to reservoir rock, fracturing fluid is water phase, and water-wet reservoir capillary force is power, can be by water
The fracturing fluid of phase is strapped in pore throat, therefore is had most of fracturing fluid and remained in stratum, is blocked hole, is caused to hurt to reservoir
Evil.It is therefore desirable to propose a kind of new wetability modification scheme, the crude oil in hole can be cemented out by imbibition effect,
Fracturing fluid recovery (backflow) can be come out simultaneously, improve the row of returning and lead, provide flow channel for crude oil.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of fine and close oil storages
The remodeling method and device of layer wetability can use the wetability that surfactant dynamic changes reservoir, to improve cause
The recovery ratio of close oil reservoir and the row of returning lead.
The specific technical solution of the present invention is:
The present invention provides a kind of remodeling method of fine and close oily reservoir wettability, comprising the following steps:
Surfactant is chosen, the wet reservoir of oil can be switched to water-wet reservoir by the surfactant, and can be rinsed by crude oil
Fall；
Stratum is pumped into after the surfactant is mixed with fracturing fluid；
Bored well in the given time promotes the wet reservoir of oil to be reversed to so that the surfactant comes into full contact with rock
Water-wet reservoir, and realize oil and water displacement；
Drive a well the row's of returning production, so that crude oil washes out the surfactant in reservoir, and then it is oily wet to revert to rock, promotees
Into the row of returning, reduce injury of the fracturing fluid to reservoir.
In one preferred embodiment, the surfactant is selected from α sodium olefin sulfonate and aliphatic alcohol polyethenoxy
Any one in ether, wherein the degree of polymerization of fatty alcohol polyoxyethylene ether is 7-12.
In one preferred embodiment, adding proportion of the surfactant in the fracturing fluid is 0.1-
0.15%.
In one preferred embodiment, the rock core for being saturated crude oil is put into the surfactant and carries out imbibition,
Imbibition recovery ratio is tested, using the imbibition recovery ratio maximum value corresponding time as the predetermined time of bored well.
In one preferred embodiment, covering for the stratum presses matrix permeability less than 0.1 × 10-3μm2。
In addition, the present invention also provides a kind of remodeling methods using fine and close oily reservoir wettability described in any of the above embodiments
The transformation device of fine and close oil reservoir wettability, comprising:
Module is chosen, is configured as choosing surfactant, the wet reservoir of oil can be switched to water-wet storage by the surfactant
Layer, and can be rinsed out by crude oil；
It is pumped into module, is configured as being pumped into stratum after mixing the surfactant with fracturing fluid；
Bored well module is configured as bored well in the given time, so that the surfactant comes into full contact with rock, promotees
So that the wet reservoir of oil is reversed to water-wet reservoir, and realizes oil and water displacement；
The row's of returning module is configured as the row's of the returning production that drives a well, so that crude oil washes out the surfactant in reservoir, and then makes
Rock reverts to oily wet, the promotion row of returning, injury of the reduction fracturing fluid to reservoir.
In one preferred embodiment, the surfactant is selected from α sodium olefin sulfonate and aliphatic alcohol polyethenoxy
Any one in ether, wherein the degree of polymerization of fatty alcohol polyoxyethylene ether is 7-12.
In one preferred embodiment, adding proportion of the surfactant in the fracturing fluid is 0.1-
0.15%.
In one preferred embodiment, the bored well module includes test cell, and the test cell includes: will be full
It is put into the surfactant with the rock core of crude oil and carries out imbibition, test imbibition recovery ratio, the imbibition recovery ratio is maximum
It is worth predetermined time of the corresponding time as bored well.
In one preferred embodiment, covering for the stratum presses matrix permeability less than 0.1 × 10-3μm2。
By above technical solution, the beneficial effects of the present application are as follows: the oily reservoir wettability of densification of the invention changes
It makes method and device and can effectively improve fine and close oily oil reservoir and return row and lead, improve fine and close oily oil reservoir yield.
Referring to following description and accompanying drawings, specific implementations of the present application are disclosed in detail, specify the original of the application
Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, presently filed embodiment includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed in the present application in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding to the application, and
It is not the specific shape and proportional sizes for limiting each component of the application.Those skilled in the art, can under teachings of the present application
Implement the application to select various possible shapes and proportional sizes as the case may be.In the accompanying drawings:
Fig. 1 is the remodeling method flow chart of the oily reservoir wettability of densification of the application embodiment；
After Fig. 2 impregnates in α sodium olefin sulfonate for rock core in embodiment 1, the angle of wetting size of oil dripping drop test；
After Fig. 3 is impregnated and rinsed with crude oil by α sodium olefin sulfonate for rock core in embodiment 1, the angle of wetting of oil dripping drop test
Size；
Fig. 4 is that the imbibition recovery ratio that rock core is tested in α olefin sulfonic acid sodium solution in embodiment 1 changes with time；
After Fig. 5 impregnates in fatty alcohol polyoxyethylene ether for rock core in embodiment 2, the angle of wetting size of oil dripping drop test；
After Fig. 6 is impregnated by fatty alcohol polyoxyethylene ether for rock core in embodiment 2 and is rinsed with crude oil, the profit of oil dripping drop test
Wet angle size；
Fig. 7 is the change of the imbibition recovery ratio tested in fatty alcohol polyoxyethylene ether solution of rock core at any time in embodiment 2
Change；
Fig. 8 is the transformation apparatus module figure of the oily reservoir wettability of densification of the embodiment of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the application embodiment, the technical solution in the application embodiment is carried out clear
Chu is fully described by, it is clear that described embodiment is only a part of embodiment of the application, rather than whole realities
Apply mode.Based on the embodiment in the application, those of ordinary skill in the art institute without creative efforts
The every other embodiment obtained, shall fall in the protection scope of this application.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
As shown in Figure 1, the embodiment of the present invention provides a kind of remodeling method of fine and close oily reservoir wettability, this method includes
Following steps:
S1: surfactant is chosen, the wet reservoir of oil can be switched to water-wet reservoir by the surfactant, and can be rushed by crude oil
It washes off.
S2: stratum is pumped into after the surfactant is mixed with fracturing fluid.
S3: bored well in the given time promotes the wet reservoir reversion of oil so that the surfactant comes into full contact with rock
For water-wet reservoir, and realize oil and water displacement.
S4: drive a well the row's of returning production, so that crude oil washes out the surfactant in reservoir, and then rock is made to revert to oil
It is wet, promote the row of returning, reduces injury of the fracturing fluid to reservoir.
In the present embodiment, suitable surfactant is chosen, it is desirable that the surfactant can turn the wet reservoir of oil
For water-wet reservoir, and can be washed out by crude oil.In general, the surfactant is selected from α sodium olefin sulfonate and fat
Any one in alcohol polyoxyethylene ether, wherein the degree of polymerization of fatty alcohol polyoxyethylene ether is 7-12.
Need to be illustrated, reservoir rock wetability usually can according to water the angle, θ of the surface of solids measurement
To define the wetability of system.It is soaked when general definition θ < 75 ° for water.It is neutral wetting when 105 ° > θ > 75 °.When θ > 105 °
It is glossy wet.
In order to verify whether the surfactant of selection has the function of wettability reversal, before construction, it should choose and correspond to
The underground rock core of reservoir carries out wettability reversal experiment.In addition, the core surface is rinsed using crude oil, after drying after wettability reversal
It is wet whether testing rock core surface contact angle becomes oil again.After meeting condition, the rock core for being saturated crude oil is put into a certain concentration (0.1-
0.2%) progress imbibition experiment in surfactant, test imbibition recovery ratio, the imbibition recovery ratio maximum value corresponding time,
In this, as the foundation of closed time.
Then pressing crack construction is carried out, the fracturing fluid containing surfactant is pumped into stratum.By a certain concentration (0.1-
0.2%) surfactant, which is mixed into fracturing fluid, to be stirred evenly, as fracturing fluid is pumped into stratum, it is ensured that surfactant and fracturing fluid
Compatibility.In general, since concentration is larger, it will increase cost, therefore, the surfactant is in the fracturing fluid
In adding proportion be 0.1-0.15%.
After pressure break, for a period of time, imbibition recovery ratio maximum value is corresponding in specific time reference imbibition experiment for bored well
Time point is differed, comes into full contact with surfactant with rock for generally 1 day to 30 days, and the wet reservoir of oil can be promoted to be reversed to
Water-wet reservoir, since water-wet rock oil recovery factor is higher, crude oil is easy that grease may be implemented from reasons such as rock surface removings
Displacement.
Finally carry out driving a well the row's of returning production, and since surfactant is easier to be dissolved in crude oil, crude oil is by surface-active
Agent is removed from core surface, and rock reverts to that oil is wet, and since the wet rock surface of oil is not hydrophilic, water is easy to be discharged from stratum is counter
Come, the row of returning can be promoted, reduces injury of the fracturing fluid to reservoir.After bored well, drive a well the row's of returning generation, and record returns discharge capacity and production
Amount.
Wherein, the stratum in pressing crack construction (oil reservoir), which is often referred to preserve, is covering pressure matrix permeability less than 0.1 × 10-3μm2
The reservoirs such as tight sand, dense carbonate in, the stone that is formed without extensive long-distance migration (nearly source aggregation)
Oil aggregation.
Two specific embodiments are given in the present invention to say the remodeling method of above-mentioned fine and close oily reservoir wettability
It is bright.It should be noted, however, that the specific implementation merely to the present invention is better described, do not constitute to it is of the invention not
Work as restriction.
Embodiment 1
The embodiment simulates being pumped into for pressing crack construction with rock core flowing experiment, bored well and returns and is drained through journey, so that verifying should
The reasonability of scheme.
The rock core for choosing certain domestic fine and close oily reservoir, 6 centimetres of length or so, rock core oil washing is dried by 2.54 centimetres of diameter
Afterwards, using crude oil aging 1 month under the conditions of formation temperature (75 DEG C) and pressure (25MPa), angle of wetting is tested after removal of core
It is wet for oil.
Using the α sodium olefin sulfonate of 2%KCL configuration 0.1%, rock core is put into solution, is dripped in rock core lower surface oil dripping,
Testing the contact angle of oil droplet in water is 133.8 ° (see Fig. 2), it was demonstrated that α sodium olefin sulfonate can make oil wet surface switch to water-wet table
Face.Core surface is rinsed using crude oil later, after wiping surface oil slick, is put into 2%KCL solution and is dripped in rock core lower surface oil dripping
Testing contact angle is 47.5 ° (see Fig. 3), illustrates that rock core is restored to oily wet condition again.
The rock core for being saturated crude oil is put into 0.1% surfactant solution and does imbibition experiment, at regular intervals, is taken
Rock core out dries surface and weighs, and calculates imbibition recovery ratio according to grease density contrast, stops experiment after recovery ratio is constant,
Reach maximum time point for bored well dwell time, as shown in Figure 4 with imbibition recovery ratio, it is proposed that closed time is 46 hours.
After rock core after another piece of aging is saturated crude oil, it is packed into core holding unit, is used under formation temperature and pressure
For crude oil with 0.05ml/min displacement to stabilization, test original permeability is 0.08mD, then uses 0.1% α sodium olefin sulfonate
Solution reverse displacement 0.3PV, simulation fracturing fluid injection, and termination of pumping 46 hours simulate bored well, finally reuse crude oil forward direction displacement
The row's of returning production is simulated, measures mouth containing water and permeability, and compare with the simulation fracturing fluid that surfactant is not added.Knot
Fruit such as table 1:
Table 1
Embodiment 2
Certain domestic compact oil reservoir, depth of reservoirs 2000m~2200m, strata pressure 18MPa, 66 DEG C of formation temperature, porosity
11%, in-place permeability 0.08mD:
Rock core, after rock core oil washing is dried, the aging 1 under formation temperature and pressure condition using crude oil are obtained from the block
A month, it was that oil is wet that angle of wetting is tested after removal of core.
Using the fatty alcohol polyoxyethylene ether (degree of polymerization 7-12) of 2%KCL configuration 0.15%, rock core is put into solution
In, it is dripped in rock core lower surface oil dripping, the contact angle of test oil droplet in water is 137.6 ° (see Fig. 5), it was demonstrated that fatty alcohol polyoxy second
Alkene ether can make the wet reservoir of oil switch to water-wet reservoir.Core surface is rinsed using crude oil later to be put into after wiping surface oil slick
Testing contact angle in rock core lower surface oil dripping in 2%KCL solution is 49.8 ° (see Fig. 6), illustrates that rock core is restored to the wet shape of oil again
State.
The rock core for being saturated crude oil is put into 0.15% surfactant solution and does imbibition experiment, at regular intervals,
Rock core is taken out, surface is dried and is weighed, imbibition recovery ratio is calculated according to grease density contrast, is stopped after recovery ratio is constant real
It tests, maximum time point is reached for bored well dwell time with imbibition recovery ratio.Experimental result is as shown in Figure 7.It can be with from imbibition result
It obtains, recovery ratio reaches maximum at imbibition 12 days, it is therefore proposed that bored well 12 days.
Fracturing fluid containing 0.15% fatty alcohol polyoxyethylene ether is pumped into stratum, bored well is after 12 days, and drive a well the row's of returning production,
The accumulative row of returning of metering leads and the daily output, and Lin Jing identical with reservoir conditions and pressing crack construction condition is compared, and Lin Jing is used
Conventional fracturing fluid pressing crack construction, the results are shown in Table 2:
Table 2
In addition, additionally providing a kind of changing for fine and close oily reservoir wettability based on the same inventive concept, in the embodiment of the present invention
Device is made, as described in the following examples.The principle that is solved the problems, such as due to a kind of transformation device of fine and close oily reservoir wettability and
A kind of remodeling method of fine and close oily reservoir wettability is similar, therefore the implementation of the transformation device of fine and close oily reservoir wettability can be joined
See the implementation of the remodeling method of fine and close oily reservoir wettability, overlaps will not be repeated.It is used below, term " unit " or
The combination of the software and/or hardware of predetermined function may be implemented in person's " module ".Although device described in following embodiment is preferable
Ground is realized with software, but the realization of the combination of hardware or software and hardware is also that may and be contemplated.
Attached drawing 8 is referred to, the embodiment of the present invention also provides a kind of using fine and close oily reservoir profit described in any of the above embodiments
The transformation device of the oily reservoir wettability of the densification of moist remodeling method, comprising:
Module 101 is chosen, is configured as choosing surfactant, the wet reservoir of oil can be switched to water-wet by the surfactant
Reservoir, and can be rinsed out by crude oil；
It is pumped into module 102, is configured as being pumped into stratum after mixing the surfactant with fracturing fluid；
Bored well module 103 is configured as bored well in the given time, so that the surfactant sufficiently connects with rock
Touching promotes the wet reservoir of oil to be reversed to water-wet reservoir, and realizes oil and water displacement；
The row's of returning module 104 is configured as the row's of the returning production that drives a well, so that crude oil washes out the surfactant in reservoir, into
And it is oily wet to revert to rock, promotes the row of returning, and reduces injury of the fracturing fluid to reservoir.
Any one of the surfactant in α sodium olefin sulfonate and fatty alcohol polyoxyethylene ether, wherein fat
The degree of polymerization of alcohol polyoxyethylene ether is 7-12.
Adding proportion of the surfactant in the fracturing fluid is 0.1-0.15%.
The bored well module includes test cell 105, and the test cell 105 includes: to be put into the rock core for being saturated crude oil
Carry out imbibition in the surfactant, test imbibition recovery ratio, using the imbibition recovery ratio maximum value corresponding time as
The predetermined time of bored well.
Pressure matrix permeability is covered less than 0.1 × 10 in the stratum-3μm2。
In another embodiment, additionally provide a kind of software, the software for execute above-described embodiment and preferably
Technical solution described in embodiment.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned software is stored in the storage medium,
The storage medium includes but is not limited to: CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, embodiment of the present invention realizes following technical effect: the densification oil of invention
The remodeling method and device of reservoir wettability, which can effectively improve fine and close oily oil reservoir and return row, to be led, and fine and close oily oil reservoir yield is improved.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of remodeling method of fine and close oily reservoir wettability, which comprises the following steps:
Surfactant is chosen, the wet reservoir of oil can be switched to water-wet reservoir by the surfactant, and can be rinsed out by crude oil；
Stratum is pumped into after the surfactant is mixed with fracturing fluid；
Bored well in the given time promotes the wet reservoir of oil to be reversed to water-wet so that the surfactant comes into full contact with rock
Reservoir, and realize oil and water displacement；
Drive a well the row's of returning production, so that crude oil washes out the surfactant in reservoir, and then it is oily wet to revert to rock, promotes to return
Row reduces injury of the fracturing fluid to reservoir.
2. the remodeling method of fine and close oily reservoir wettability according to claim 1, which is characterized in that the surfactant
Any one in α sodium olefin sulfonate and fatty alcohol polyoxyethylene ether, wherein the degree of polymerization of fatty alcohol polyoxyethylene ether is
7-12。
3. the remodeling method of fine and close oily reservoir wettability according to claim 1 or 2, which is characterized in that the surface is living
Property adding proportion of the agent in the fracturing fluid be 0.1-0.15%.
4. the remodeling method of fine and close oily reservoir wettability according to claim 3, which is characterized in that the rock of crude oil will be saturated
The heart, which is put into the surfactant, carries out imbibition, imbibition recovery ratio is tested, when the imbibition recovery ratio maximum value is corresponding
Between predetermined time as bored well.
5. the remodeling method of fine and close oily reservoir wettability according to claim 1, which is characterized in that cover pressure in the stratum
Matrix permeability is less than 0.1 × 10-3μm2。
6. a kind of densification oil of the remodeling method using the oily reservoir wettability of densification described in any one of the claims 1-5
The transformation device of reservoir wettability characterized by comprising
Module to be chosen, is configured as choosing surfactant, the wet reservoir of oil can be switched to water-wet reservoir by the surfactant, and
It can be rinsed out by crude oil；
It is pumped into module, is configured as being pumped into stratum after mixing the surfactant with fracturing fluid；
Bored well module is configured as bored well in the given time and so that the surfactant comes into full contact with rock promotes oil
Wet reservoir is reversed to water-wet reservoir, and realizes oil and water displacement；
The row's of returning module is configured as the row's of the returning production that drives a well, so that crude oil washes out the surfactant in reservoir, and then makes rock
It is wet to revert to oil, promotes the row of returning, reduces injury of the fracturing fluid to reservoir.
7. the transformation device of fine and close oily reservoir wettability according to claim 6, which is characterized in that the surfactant
Any one in α sodium olefin sulfonate and fatty alcohol polyoxyethylene ether, wherein the degree of polymerization of fatty alcohol polyoxyethylene ether is
7-12。
8. the transformation device of fine and close oily reservoir wettability according to claim 6 or 7, which is characterized in that the surface is living
Property adding proportion of the agent in the fracturing fluid be 0.1-0.15%.
9. the transformation device of fine and close oily reservoir wettability according to claim 8, which is characterized in that the bored Jing Mokuaibao
Test cell is included, the test cell includes: that the rock core for being saturated crude oil is put into the surfactant to carry out imbibition, test
Imbibition recovery ratio, using the imbibition recovery ratio maximum value corresponding time as the predetermined time of bored well.
10. the transformation device of fine and close oily reservoir wettability according to claim 6, which is characterized in that cover on the stratum
Press matrix permeability less than 0.1 × 10-3μm2。
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