CN107366519A - A kind of fine profile control method of chemistry - Google Patents
A kind of fine profile control method of chemistry Download PDFInfo
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- CN107366519A CN107366519A CN201710612573.3A CN201710612573A CN107366519A CN 107366519 A CN107366519 A CN 107366519A CN 201710612573 A CN201710612573 A CN 201710612573A CN 107366519 A CN107366519 A CN 107366519A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012224 working solution Substances 0.000 claims abstract description 59
- 230000035699 permeability Effects 0.000 claims abstract description 40
- 239000012530 fluid Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000037361 pathway Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention discloses a kind of fine profile control method of chemistry, and it comprises the following steps：Determine the high permeability zone and less permeable layer in oil reservoir；Determine the minimum suction pressure of the less permeable layer；Xiang Jingzhong, which injects the first working solution and injects pressure, is not less than the minimum suction pressure, first working solution is entered the less permeable layer；Xiang Jingzhong, which injects interval fluid and injects pressure, is not higher than the minimum suction pressure, to be pushed ahead the first working solution in the high permeability zone by the interval fluid；Xiang Jingzhong, which injects the second working solution and injects pressure, is not less than the minimum suction pressure；Second working solution enters the less permeable layer and reacts the closure to be formed to the less permeable layer with first working solution.
Description
Technical field
The present invention relates to oil extraction in oil field technology field, more particularly to a kind of fine profile control method of chemistry.
Background technology
At present, the waterflooding development in most of oil field comes into the later stage, and the stratum of oil-water well is due to waterflooding extraction for many years
Water drive predominant pathway is formd, the water drive predominant pathway has a strong impact on the normal effect of waterflooding development with the characteristics of its high osmosis
Fruit.
Improving the mode of this water drive situation at present has the modes such as profile control, transfer drive and water blockoff, and profile control can be divided into chemical tune again
Cut open with mechanical profile control, the method that mechanical profile control is used in the case where formation condition allows, and do not possess use in formation condition
Chemical profile control can only be used in the case of mechanical profile control.
, can not but the predominant pathway that high permeability zone is formed during chemical profile control agent is injected effectively is blocked
What is avoided can also produce certain plugging action to less permeable layer, and less permeable layer can be by a certain degree of broken after such profile control
It is bad.
The content of the invention
In view of the deficiencies in the prior art, the present invention is necessary a kind of fine profile control method of chemistry, with can be preferentially to hypotonic
Permeable layers are blocked, and are protected its less permeable layer during follow-up profile control, are then carried out formal profile control operation again, treat
After profile control reaches construction purpose, de-plugging is carried out to the temporarily stifled medicament of less permeable layer, realizes the purpose of fine profile control.
To reach above-mentioned purpose, the present invention provides a kind of fine profile control method of chemistry, and it comprises the following steps：
Determine the high permeability zone and less permeable layer in oil reservoir；
Determine the minimum suction pressure of the less permeable layer；
Xiang Jingzhong, which injects the first working solution and injects pressure, is not less than the minimum suction pressure, makes first work
Liquid enters the less permeable layer；
Xiang Jingzhong injects interval fluid and injects pressure and is not higher than the minimum suction pressure, to pass through flow blocking between described
Body pushes ahead the first working solution in the high permeability zone；
Xiang Jingzhong, which injects the second working solution and injects pressure, is not less than the minimum suction pressure；Second working solution
The closure to be formed to the less permeable layer is reacted into the less permeable layer and first working solution.
It is as a preferred embodiment, further comprising the steps of：
Profile control is carried out to the high permeability zone, to block the high permeability zone.
As a preferred embodiment, injection pressure during to the high permeability zone profile control minimum sucks higher than described
More than pressure 2-5MPa.
As a preferred embodiment, also include：
Into well, liquid is protected in injection after the high permeability zone profile control terminates；It is then injected into de-plugging agent and releases the hyposmosis
The closure of layer carries out following injected water.
As a preferred embodiment, before the first working solution is injected, predetermined fluid is injected until note into well
Enter pressure and reach the minimum suction pressure, to prevent the first working solution of injection from largely or entirely being flowed in the high permeability zone
Lose.
As a preferred embodiment, the predetermined fluid is water or solution of predetermined viscosity.
As a preferred embodiment, the interval fluid is water.
As a preferred embodiment, testing profile-log of water injection, the water absorption of each substratum in oil-yielding stratum is tested,
Each substratum is divided into by high permeability zone and less permeable layer according to the water absorption.
As a preferred embodiment, also include：
In drilling well, oil reservoir and each substratum are determined by the oil/gas show during chemical well logging and core analysis.
As a preferred embodiment, by the flow rate test of the different layers under different pressures, less permeable layer is determined
Minimum suction pressure；Wherein, the less permeable layer does not have flow indication before not up to its minimum suction pressure.
As a preferred embodiment, the Na that it is 5%~20% that the first working solution, which is concentration,2CO3Solution；Second work
It is the FeCI that concentration is 5%~30% as liquid3Solution.
The fine profile control method of chemistry provided by the present invention is by before conventional profile control is carried out, first carrying out two-fluid process tune
Cut open, i.e. the first working solution of preferential injection and the interaction of the second working solution block to less permeable layer, make it in follow-up tune
Less permeable layer is protected during cuing open, and then carries out formal profile control operation again, after profile control reaches construction purpose, to hyposmosis
The temporarily stifled medicament of layer carries out de-plugging, realizes the purpose of fine profile control.
With reference to following explanation and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, specifies the original of the present invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms that profit requires, embodiments of the present invention include many changes, modifications and are 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
Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those skilled in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the fine profile control method schematic flow sheet of chemistry that one embodiment of the present invention provides；
Fig. 2 is water injection well injectivity profile figure used by one embodiment of the present invention；
Fig. 3 is step S25 schematic diagrames in Fig. 1；
Fig. 4 is step S30 schematic diagrames in Fig. 1；
Fig. 5 is step S40 schematic diagrames in Fig. 1；
Fig. 6 is step S50 schematic diagrames in Fig. 1.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained on the premise of creative work is not made, should all belong to guarantor of the present invention
The scope of shield.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more
The arbitrary and all combination of related Listed Items.
Fig. 1 to Fig. 6 is referred to, the fine profile control method of one kind chemistry provided for one embodiment of the present invention, the chemistry
Fine profile control method comprises the following steps：
S10, determine high permeability zone and less permeable layer in oil reservoir；
In step S10, profile-log of water injection is tested, the water absorption of each substratum in oil-yielding stratum is tested, according to described
Each substratum is divided into high permeability zone and less permeable layer by water absorption.Wherein it is possible to permeability in substratum is less than 10 millidarcies
Stratum be classified as less permeable layer, the stratum more than 10 millidarcies is classified as high permeability zone.Generally, high permeability zone is because of predominant pathway
In the presence of the intake profile of high permeability zone and less permeable layer has obvious difference in height.
Wherein, profile-log of water injection data can reflect water injection well each individual layer (also referred to as substratum) under a certain pressure
With respect to the consecutive variations situation of water absorption in water absorbing capacity and each layer.Analysis intake profile will be seen that the longitudinal direction of reservoir flooding water
Distribution and variation tendency, monitor the water suction of oil reservoir.
In one embodiment, such as the profile-log of water injection figure of Fig. 2 oil reservoirs provided, in the intake profile figure
It can be seen that the oil reservoir has two substratums in 1000-1100 rice depth boundses：1000-1050 substratum and 1050-
1100 substratum.More it will be evident that the water absorption of 1000-1050 substratum is significantly larger than under the discharge capacity of different injection pumps
1050-1100 substratum.Wherein, 1000-1050 substratum can be divided into high permeability zone, and 1050-1100 substratum can be divided into
Less permeable layer.
S20, the minimum suction pressure for determining the less permeable layer；
In step S20, by the flow rate test of the different layers under different pressures, the minimum suction of less permeable layer is determined
Pressure；Wherein, the less permeable layer does not have flow indication before not up to its minimum suction pressure.
Fig. 2 example showns, the water suction of 1000-1050 substratum and 1050-1100 substratum under different displacements are seen again
Amount, wherein discharge capacity be 90,105,120 (unit is just cubic meter), wherein, 1050-1100 substratum (less permeable layer) 105,
There is water absorption to show under 120 discharge capacity, but do not have flow (water absorption) display under 90 discharge capacities, it is now right with 90 discharge capacities institute
The injection pressure answered can be as the minimum suction pressure of less permeable layer.
S30, inject into well the first working solution and inject pressure and be not less than the minimum suction pressure, make described first
Working solution enters the less permeable layer；
In step S30, to make the first working solution enter less permeable layer, the injection pressure of the first working solution is not less than most
Small suction pressure, it is shown so as to such as Fig. 3 (it should be noted that Fig. 3 upper black lines into Fig. 6 indicate ground), it is low
Permeable formation produces flow indication, the working solution of suction part first.Also, in that case, the first working solution can also enter height
Permeable formation.
To avoid substantial amounts of first working solution from entering high permeability zone, ensure the amount into the first working solution of less permeable layer,
As shown in Fig. 2 as preferred embodiment, before the first working solution is injected (before step S30), step S25 is carried out, should
Step S25 includes：Xiang Jingzhong injection predetermined fluids are until injection pressure reaches the minimum suction pressure, to prevent the of injection
One working solution is largely or entirely lost in the high permeability zone.
In the measure, the predetermined fluid can formerly adjust strata pressure, pre-filled to being carried out in high permeability zone, enter
And the suction pressure of high permeability zone is lifted, so the first working solution can be injected in less permeable layer as much as possible.Specifically,
The predetermined fluid is water or solution of predetermined viscosity.
S40, inject interval fluid into well and inject pressure and be not higher than the minimum suction pressure, with by between described
Flow blocking body pushes ahead the first working solution in the high permeability zone；
In step S40, it is contemplated that the working solution of part first can also enter high permeability zone in above-mentioned steps S30, be
Avoid the second working solution for being subsequently implanted into and the first working solution from being reacted in high permeability zone and produce plugging action, and then cause
Follow-up profile control measures can not be implemented.
Based on the consideration, as shown in figure 5, the first working solution is pushed ahead into one in high permeability zone by inputting interval liquid
Segment distance so that the first working solution of high permeability zone (near wellbore zone) can not have an effect or act on the second working solution it is faint,
So as to which plugging action will not be produced to high permeability zone.
Simultaneously as the input pressure of interval liquid be less than minimum suction pressure, will not enter in less permeable layer be spaced liquid or
The amount of the interval liquid of entrance is also considerably less, and reaction that will not be to follow-up less permeable layer produces obstruction.
In the present embodiment, interval fluid need to be only used different from the first working solution, the fluid of the second working solution,
Specifically, the interval fluid is water.
S50, inject into well the second working solution and inject pressure and be not less than the minimum suction pressure；Second work
Make liquid and react the closure to be formed to the less permeable layer with first working solution into the less permeable layer.
Step S50 can be with as shown in fig. 6, the second working solution be oily to be injected not less than the injection pressure of minimum suction pressure
Layer, thereby may be ensured that less permeable layer enters the second working solution, meanwhile, the second working solution of partial amount can also enter Thief zone
Layer, but due to being spaced the presence of liquid, the first working solution and the second working solution of high permeability zone react faint or not reacted.
Wherein, the first working solution meets in less permeable layer with the second working solution and reacted, and in less permeable layer (nearly well
Band) produce high intensity plugged zone, the fluid during follow-up profile control is cannot be introduced into less permeable layer, formed to less permeable layer
Protection.
First working solution and the second working solution are sedimentation type profile control agent, and both working solutions are that precipitation envelope can be produced after meeting
The profile control agent of stifled high permeability zone.It is exemplified as：First working solution is the Na that concentration is 5%~20%2CO3Solution；Second working solution is
Concentration is 5%~30% FeCI3Solution.
Reaction after first working solution meets with the second working solution is：
3Na2CO3+2FeCI3→Fe2(CO3)3+6NaCI
Fe2(CO3)3+3H2O→2Fe(OH)3↓+3CO2
In one embodiment, the fine profile control method of the chemistry can also comprise the following steps：S60, to the Thief zone
Layer carries out profile control, to block the high permeability zone.Specifically, injection pressure during to the high permeability zone profile control higher than it is described most
Small more than suction pressure 2-5MPa.Specifically, mainly include injection of polymer, gel, nanoparticle etc. in the step.
To protect less permeable layer, high permeability zone and less permeable layer can be determined according to intake profile situation is tested before profile control
Injection pressure simultaneously determines the maximum injection pressure during follow-up profile control according to the intensity of the high intensity plugged zone formed in step S50
Power.
Further, the fine profile control method of the chemistry can also include：S70, after the high permeability zone profile control terminates to
Injection protection liquid in well；It is then injected into the closure progress following injected water that de-plugging agent releases the less permeable layer.Wherein, the protection liquid
Follow-up de-plugging agent is not acted with high permeability zone profile control agent, and influence the plugging effect of high permeability zone.
For convenience of chemical profile control is implemented, the fine profile control method of the chemistry can also include：S5, in drilling well, pass through chemistry
Oil/gas show and core analysis during well logging determine oil reservoir and each substratum.Step S5 can be before step S10
Perform.Wherein, chemical well logging is the chemistry point that system is carried out by the rock core that is taken out to underground, landwaste, fluid, flushing fluid etc.
Analysis, obtains the volume of data such as its composition, component, chemical property and result, and with other log data comprehensive analysis, make and sentencing
A kind of disconnected logging method.
By above description as can be seen that the fine profile control method of chemistry that present embodiment is provided passes through in progress routine
Before profile control, two-fluid process profile control is first carried out, i.e. the first working solution of preferential injection and the interaction of the second working solution are to less permeable layer
Blocked, be protected its less permeable layer during follow-up profile control, then carry out formal profile control operation again, treat profile control
After reaching construction purpose, de-plugging is carried out to the temporarily stifled medicament of less permeable layer, realizes the purpose of fine profile control.
Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and
The all values of upper value, the interval of at least two units between any lower value and any much higher value be present.For example, such as
Fruit elaborates that the quantity of part or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is to illustrate that such as 15 to 85,22 are also clearly listed in the specification arrives
68th, 43 to 51,30 to 32 is equivalent.For the value less than 1, it is 0.0001,0.001,0.01,0.1 suitably to think a unit.
These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all scopes all include all numerals between end points and end points.It is used together with scope
" about " or " approximation " be suitable for two end points of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", including at least the end points indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describe the term " substantially by ... forms " of combination should include determined by element, composition, part or step and reality
Other elements, composition, part or the step of the basic novel feature of the combination are not influenceed in matter.Using term "comprising" or
" comprising " describes the combination of element here, composition, part or step it is also contemplated that substantially by these elements, composition, part
Or the embodiment that step is formed.Here by using term " can with ", it is intended to which illustrate that " can with " include is described any
Attribute is all optional.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
State, many embodiments and many applications outside the example provided all will be aobvious and easy for a person skilled in the art
See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to appended claims and this
The four corner of the equivalent that a little claims are possessed determines.It is for comprehensive purpose, all articles and special with reference to including
The disclosure of profit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as inventor the theme is not thought of as it is disclosed
A part for subject matter.
Claims (11)
1. a kind of fine profile control method of chemistry, it is characterised in that comprise the following steps：
Determine the high permeability zone and less permeable layer in oil reservoir；
Determine the minimum suction pressure of the less permeable layer；
Xiang Jingzhong, which injects the first working solution and injects pressure, is not less than the minimum suction pressure, enters first working solution
Enter the less permeable layer；
Xiang Jingzhong, which injects interval fluid and injects pressure, is not higher than the minimum suction pressure, to be incited somebody to action by the interval fluid
The first working solution in the high permeability zone is pushed ahead；
Xiang Jingzhong, which injects the second working solution and injects pressure, is not less than the minimum suction pressure；Second working solution enters
The less permeable layer reacts the closure to be formed to the less permeable layer with first working solution.
2. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that further comprising the steps of：
Profile control is carried out to the high permeability zone, to block the high permeability zone.
3. the fine profile control method of chemistry as claimed in claim 2, it is characterised in that injection during to the high permeability zone profile control
Pressure is higher than minimum more than the suction pressure 2-5MPa.
4. the fine profile control method of chemistry as claimed in claim 2, it is characterised in that also include：
Into well, liquid is protected in injection after the high permeability zone profile control terminates；It is then injected into de-plugging agent and releases the less permeable layer
Closure carries out following injected water.
5. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that before the first working solution is injected, Xiang Jing
Middle injection predetermined fluid is until injection pressure reaches the minimum suction pressure, to prevent the first working solution of injection in the height
Permeable formation is largely or entirely lost in.
6. the fine profile control method of chemistry as claimed in claim 5, it is characterised in that the predetermined fluid is water or made a reservation for
Viscosity solution.
7. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that the interval fluid is water.
8. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that test profile-log of water injection, test out
The water absorption of each substratum in oil reservoir, each substratum is divided into by high permeability zone and less permeable layer according to the water absorption.
9. the fine profile control method of chemistry as claimed in claim 8, it is characterised in that also include：
In drilling well, oil reservoir and each substratum are determined by the oil/gas show during chemical well logging and core analysis.
10. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that pass through the different layers under different pressures
Flow rate test, determine the minimum suction pressure of less permeable layer；Wherein, the less permeable layer is before not up to its minimum suction pressure
There is no flow indication.
11. the fine profile control method of chemistry as claimed in claim 1, it is characterised in that the first working solution be concentration be 5%~
20% Na2CO3Solution；Second working solution is the FeCI that concentration is 5%~30%3Solution.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110469291A (en) * | 2019-07-24 | 2019-11-19 | 西南石油大学 | A kind of Profile Control in Injection Well optimization method |
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