CN85101888A - From be infused in water, there is deliquescent micella surfactant solution to increase the method for receiving quarrying oil - Google Patents
From be infused in water, there is deliquescent micella surfactant solution to increase the method for receiving quarrying oil Download PDFInfo
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Abstract
One is having the petroleum reservoir of suitable cation exchange capacity (CEC), increases oil and receives the process of adopting.The displacement embolus is injected one by in a plurality of in succession notes wells that part is formed, but the solubility of injecting the anionic surfactant that water contained can be adjusted at the each several part of embolus so that increase, to compensate reacting to each other of rock and micellar solution.Above step is the order that is injected into from the variant part of considering embolus and fixed.
Description
The present invention's relevant process is and has in the petroleum reservoir of suitable ion-exchange capacity, with generation row's embolus of being made up of anionic surfactant and assistant, increases and receives quarrying oil.
Have the kinds of surface activator to be suggested increasing the most frequently used surface active agent of receipts quarrying oil is Sulfonates, is exactly the petroleum sulfonate that occurs with alkaline metal salt or ammonium salt state more precisely.
The typical concentrations of surface active agent is than its critical micella concentration height.The micellar solution that injects is the various surface active agent aqueous solution that contain indefinite component, and has a common surface active agent, be total to solvation, electrolyte, or the like, additive or contain the Water-Electrolyte of different proportion, hydrocarbon and may be common surface active agent, and/or the mixture of solvation etc. altogether.Under latter instance, the appearance of the polar molecule of enough concentration is arranged, can form the transparent mixture that is commonly referred to as slightly soluble liquid.
But known when the clay of height divalent cation-exchanged ability, greatly reduced just these receipts with surface active agent are adopted the usefulness of skill as rock band.In fact,, can increase the consumption of surface active agent, cause the excessive reservation of surface active agent, cause and make this process lose efficacy as the reaction of tungsten and magnesium ion and sulfonate, this be because:
(1) precipitation of surface active agent.
(2) if hydrocarbon has been fixed, it can conversion in mutually and be detained at hydrocarbon.
(3) its suction-operated on stone.
Tricationic produces a bigger effect, but in order to keep simplicity, we are with read-only bivalent cation.
The practice of this process is that the surface active agent that is injected can both adapt to reservoir interior liquid and temperature especially.With oil in the reservoir and water, test at reservoir temperature, select the molecular weight of surface active agent, optimum efficient is found out in the concentration of micellar solution in the distribution situation of molecular weight and it.
But, from reducing the viewpoint of interfacial tension, after the composition of micellar solution improved as far as possible, under fixed condition, the micellar solution that the preliminary physical chemistry balance between rock and the unborn liquid will be injected into reservoir changed.These changes can make micellar solution break away from its optimum efficient.Increase water-soluble degree owing to ion-exchange with under the situation that surface active agent exists, divalent ion concentration has also increased, and has also influenced the salinity of water.In addition, the composition of surface active agent and concentration, also by by existed originally liquid and promotion liquid caused waters down, and the selective absorption effect (chromatography phenomenon) of some molecule etc. changes.These have the mastery effect by the variation that porous media caused, and the efficient that process can be expected reduces many.
There is a lot of equations to be suggested as traffic of preserving micellar solution and/or the surperficial retention of enlivening agent of attenuating.
United States Patent (USP) the 4th, 232, the method for quarrying oil is received in No. 737 descriptions-in the petroleum reservoir of the water that contains high salinity, use surface active agent.The liquid that is injected comprises minimum two kinds of surface active agents :-ionic compound, for example petroleum sulfonate and-surface active agent, for example alcohol or alkyl phenyl polyoxygenated hexene sulfate or sulfonate, the dissolubility that causes the sulfonate of the water in oil reservoirs to be got.In this process, a plurality of emboluses of being made up of micellar solution can one after the other be injected into, and then reinject and contain the low salinity water solution of tackifier (water miscible polymer).The concentration of salt and surface active agent by the highest numerical value of first embolus, drops to the minimum numerical value of tail embolus with little by little.
At United States Patent (USP) the 4th, 074, in No. 755, when injecting surface active agent-polymeric system, the subduplicate ratio of main monovalent cation concentration and main bivalent cation concentration is to be maintained at-fixed numbers identical with reservoir.It is said, can avoid in reservoir, having the ion-exchange of macroion exchange capacity thus.
Even so, the intermediate experiment with top method and similar approach are carried out but often runs into failure.Several reasons wherein can be suggested as follows:
-be most appropriate to the mobile even liquid of each oilfield conditions, as run into the condition change that causes because of above-mentioned phenomenon, just can not keep original effectiveness.
-when the previous liquid composition that injects is judged as when unfavorable, extract that moisture content is difficult to carry out in these reservoirs, this is because the inhomogeneities of reservoir.
In addition, use a kind of salt to be changed insensitive non-ionic surface activator, may can make process not meet economic principle because of its high price, so just cannot form a kind of necessarily can received another kind of solution.
When petroleum sulfonate was used to receive the oily process of quarrying, they may be exactly so-called " oil " sulfonate, and this is a kind of preferable hydrocarbon-sulfonate that dissolves in that is actually.Because their anion characteristic and higher molecular weight, these surface active agents are compared the more responsive of monovalent cation to the change in concentration of the bivalent cation in the water.For example reservoir rock has a height cation exchange capacity (CEC), and these variations will be greatly, if again behind the injecting carbon dioxide, the variation that is caused by dissolving of calcium carbonate is also quite big.
Within a certain bivalent cation concentration limit, and this limit conforms with the molar mass average value of sulfonate and distribution thereof, though sulfonate is cumulative to the affinity of oil, micellar solution also can be stood these variations.On maximum, one can make phase after-tack breast mix the qualitative change meeting appearance that liquid (Water-In-Oil) forms.And then, remaining in oily saturation ratio can increase, and the reservation degree of sulfonate also increases, and micellar solution is decomposed.
Should clearer the present invention and benefit thereof from the description followed and accompanying drawing:
Accompanying drawing 1A demonstration, after injection one has " oil " class sulfonate that dissolves in hydrocarbon of optimum composition, unrecovered oil saturation ratio and sulfonate reservation degree.
Accompanying drawing 1B shows, after injecting a water-soluble sulfonate, and unrecovered oil saturation ratio and sulfonate reservation degree.
Accompanying drawing 1C explanation: inject a displacement embolus according to the present invention after, unrecovered oil saturation ratio and sulfonate reservation degree.
Accompanying drawing 2D shows, the unrecovered oil saturation ratio after injecting water, with and injecting carbon dioxide after the unrecovered oil saturation ratio.
Accompanying drawing 2E shows: at injecting carbon dioxide, and unrecovered oil saturation ratio behind the water-soluble sulfate that reinjects and sulfonate reservation degree.
Accompanying drawing 2F shows: injecting carbonoxide, injecting unrecovered oil saturation ratio and sulfonate reservation degree behind the displacement embolus again according to the present invention.
Accompanying drawing 3 shows that according to the present invention, the concentration of the sulfonate in the organic facies of trickle, calcium and iron compares with the 1C test, and receives the volume of adopting oil.
More cheap sulfonic acid also can be used to make micellar solution.These sulfonate except that comprising mahogany acid, also have lower molecular weight-sulfonate, and the inorganic salts (especially sodium sulphate) of two or the many sulfonic acid class that in manufacture process, produce.The inorganic salts composition of this class sulfonate also accounts for an important seat in the ion-exchange phenomenon.
In the present invention, we observe, when with one wait the micellar solution of sulfonate manufacturing to inject thus-when the reservoir of small ion exchange capacity is not arranged, owing to work with the divalent ion of the rock that is dissolved in solution, the usefulness of moving oil will increase.This can be shown by following each example by the course of dissolution that sulfonate solution caused.
But, favourable bivalent cation range of concentrations is to be decided by these cations.The ratio of the concentration of calcium and sulfonate concentration for example is with the sulfonate concentration that is decided by in micellar solution.Though it is higher water-soluble that this sulfonate has than petroleum sulfonate, also can work as C as routine 1A
++ aWhen p-sulfonic acid salinity ratio increases, be caught to catch.But, as if we needn't too fear because of mixing the situation that liquid causes sealing porous media to forming the viscosity breast.Accompanying drawing 1B is this type of sulfonate situation of injection, unrecovered oil saturation ratio S
HRBe with voids volume V
PFraction representation, and the reservation degree A of sulfonate then is to represent with milligram/gram rock.Therefore can see, because the sulfonate of this sulfonate and optimum is by comparison, can be too hydrophilic, therefore, when adopting, can cause following restriction:
-near the injection well, the micella system can not reach optimum C
++ a/ sulfonate concentration ratio.Therefore, usefulness is not high enough, and the unrecovered oil saturation ratio is still stayed a higher level.
-be the non-optimum condition that the compensation breast mixes the formation of liquid and the location that is captured is caused must inject micellar solution in a large number, but this can make this process not meet economic principle.
-higher when the concentration of bivalent cation in reservoir water, or contain injecting carbon dioxide in the reservoir rock of carbonate, and when bivalent cation concentration is increased, similar difficulty will occur one.
Accompanying drawing 2E is shown, is at injecting carbon dioxide, the situation behind the water-soluble petroleum sulfonate that reinjects: unrecovered oil saturation ratio S
HRBe with voids volume V
PFraction representation, the reservation degree A of sulfonate then is to calculate with milligram/gram rock, with the function representation of the length L (Cm) of porous media.In this case, when the injection beginning, sulfonate just runs into the calcium of enough deals, and displacement goes out oil effectively.But, after a short distance, flood the surface active agent that medium keeps maximum area, then, the ability of micellar solution displacement oil will go down.
Therefore, because the phenomenon that takes place when displacement (the band polyvalent cation is gone into solution, exchange ion, some surface active agent molecule of preferential adsorption) when the displacement liquid of an even composition is injected into, the micellar solution adaptation to set up New Terms gradually and will be had any problem.
The invention provides one can improve amplification and receive the process of adopting crude oil in the geological structure that forms petroleum reservoir; Reservoir has suitable ion-exchange capacity, need get out a minimum injection well and a producing well again.Introduce a displacement embolus from injecting well, comprise that one is adapted to oil is pushed to the anionic surfactant of a minimum producing well, and be made up of a plurality of zone institutes of one after the other injecting, some is minimum to contain a kind of anionic surfactant.Go into order in the well according to injecting the embolus zones of different, can adjust solubility, it is increased during to another to some extent by a zone of embolus.
And then, see through the molten liquid of driving mutually of injection well water filling and go into the stone layer, this will promote the displacement embolus, and it pushes oil to producing well again.
The system that forms the displacement embolus contains the surface active agent of selecting especially, because of it can deal with each physics and the chemical phenomenon that contains clay and the carbonate and/or the sandstone reservoir rock of cation exchange capacity (CEC) cannot not arranged lowly.
In every gram rock when every ion-exchange value one be that this process is very favourable when being situated between the exchangeable ion of 0.1 to 10 milliequivalent (meg), again when the ion-exchange value 1 to 3meg/100 when restraining rock, then more favourable.At last, though the surface active agent that the present invention measures in consuming, desire can guarantee that highly the oil receipts are adopted efficient.
For this reason, except with the anionic surfactant, we are more with a solution that includes each assistant of variable concentrations.
Anionic example has following various, but desire is not to be only limited to these examples, sulfonate, carboxylate, phosphate, phthalate, sulfate or the like or the mixture of these materials.It perhaps has following equation:
R
1-X
- 1M
+
R here
1Be an aliphatic atomic group, 8 to 24 carbon atoms are arranged, or an alkyl aromatic atomic group that 14 to 36 carbon atoms are arranged; X
- 1Be polarity atomic group of monosulfonate, sulfate, carboxylate, phosphate, phthalate etc. and so on, and M
+Then a monovalence cation normally for example is an ammonium or an alkalinous metal.This anionic surfactant also can be by the petroleum sulfonate that oleum or sulfur trioxide produced on the crude oil that is added on crude oil or is separated out.
For asking convenient, in following each example, we will be categorized as petroleum sulfonate to this anionic surfactant.
This is injecting the beginning solubility that water changes anionic surfactant, and make solubility along with solution in porous media advances and the assistant that increases gradually can be, but be not limited to, following example:
-aliphatic one alcohol is made up of 4 to 18 carbon atoms, ethyl-2 hexanol for example, or as any polar substances of amine, ketone, ether etc., or have enough carbon atom numbers to lower the ester of anionic surfactant solubility of the water of injection, for example dye alcohol oil.
-as alkyl or alkylaryl polyglycol ether class, or alkyl-or the surface active agent of the sulfonate of alkylaryl polyglycol ether sulfate or phosphate or phthalate or carboxylate or alkalinous metal or amine etc.It can have following equation:
R
2-O（CH
2CH
2O）
nH
The R here
2-aliphatic the atomic group formed by 8 to 24 carbon atoms or-the alkyl aromatic atomic group formed by 14 to 36 carbon atoms, and the numerical value of n is 1 to 50; Or R
3-O(CH
2CH
2O)
M-1CH
2CH
2X
- 2M
+, the R here
3Have and R with m
2And the identical definition of n, X
- 2Have and X
- 1Identical definition, and M
+Normally-as the monovalent cation of amine or alkalinous metal.
This auxiliary surface activator is as the solubility of the water that increases injection to anionic surfactant.
-one has the aliphatic-alcohol by one to five carbon atom, for example isopropyl alcohol, or any other material, for example amine, ketone, ether and the ester of enough low carbon atom number orders with the solubility of the cation surfactant of the water that increase to inject arranged.
In addition, micellar solution also can comprise and is applied to increase oil now and receives the mobility controlling agent of adopting, and though for example its hydrolysis whether polyacrylamide, its mean molecule quantity is 4 * 10
6To 10 * 10
6Dalton, or-mean molecule quantity is 1 * 10
6To 5 * 10
6Polysaccharide between the dalton.It can also contain-by crude oil or-be separated out crude oil or the crude oil that refined heat up in a steamer formed hydrocarbon or-pure fats or the cyclic hydrocarbon or the mixture of these materials.
After ion transposing (ion-exchange, dissolution) and chromatography effect, just can set up the condition that guarantees normal displacement usefulness.Assistant protection anionic surfactant makes its not reason composition variation, and the danger that is retained is arranged.The reason of selecting them is both to have avoided the precipitation danger of anionic surfactant, can obtain the system of low interfacial tension by micellar solution and the synergism that comes from the bivalent cation of stone again.
The present invention utilizes foreseeable interaction in the reservoir, and method is to adjust the solubility gradients of the anionic surfactant of the water that injects.This highest solubility in water must adapt to the own factor of reservoir (rock, water, oil, temperature), and anionic surfactant, with the kinetics that reaches this phenomenon.Solubility gradients be by-produced with following method by the embolus in a plurality of zones:
First of-displacement the embolus that injected partly is-micellar solution of negative ionic surfactant, its composition is to make optimized method according near the situation predicted the injection well: for example, water in the stone layer be low salt and available surface active agent is suitable water-soluble, the balance of the hydrophilic and lipophilic tendency of surface active agent, just lowering its solubility at the water that injects, is following obtaining:
Add suitable surface active agent that is dissolved in oil,
And/or add the alcohol of a long-chain,
And/or increase electrolytical concentration
Second of-this embolus is formed by-water anionic surfactant solution, does not have assistant in it or has only assistant in a small amount, depends on purposes and decides.This solution is through one section long porous media route, just reaches peak efficiency, and this also is after itself and rock exchange ion.
The third part of-this embolus is the aqueous solution, and it contains or do not contain the one or more assistants of ionic surfactant, its objective is the reservation degree that reduces sulfonate: it can be ion or non-ionic surface activator and (or) and low molecular monohydric alcohol.Assistant has the minimum living Office Copy and keeps SOLUTION PROPERTIES in optimum state.In addition, the sensitivity of reduction micellar solution is divalent ion.Last because their can dispersion emulsifiers and make surface active agent emit molecule, thereby can keep anion to flow again.
The 4th of-this embolus partly is an aqueous solution, and the mobility controlling agent and/or the assistant that include enough concentration can lower the reservation degree of anionic surfactant to strengthen its solubility at the water that injects again.
The design of embolus composition must have retractility, so just can consider the various possibility situations when using.For example, this displacement embolus can be made up of four areas of many mistakes.
If the salinity of the water that injects is enough height, and contain injecting carbon dioxide in the reservoir rock of basic metal carbonate one, cause the concentration that rolls up the bivalent cation in the solution, or used anionic surfactant should be dissolved in oil, and injection process just should directly partly begin (referring to the example of test 2F) by second of embolus.This second partly optimum be by the essence of considering anionic surfactant and reservoir conditions reach to.
In description subsequently, hundred parts is to represent with the weight of enlivening material than (%).The salinity that is present in the stone layer and/or is used for the water of displacement oil is that the equivalent with sodium chloride calculates.Be not higher than 3% as each the regional salinity at embolus, this very has this process very much.
Author of the present invention during near 1.5% water, was once obtaining very good result with salinity.
According to the present invention, the anionic surfactant total concentration of first part of embolus is 1% to 10% at the water that injects, and wherein 0 to 5% is the suitable surface active agent that is dissolved in oil, and all the other are formed by the suitable anionic surfactant that is dissolved in water.In addition, the water of injection contains the alcohol of 0 to 5% high carbon atom number, for example ethyl-2 hexanol or in the monovalence of 0 to 0.05 mol or the fusel oil of bivalent cation salt, for example C are arranged
++ aAnd Mg
++, by 0 to 0.2% one water-soluble polymer with by 0 to 10% hydrocarbon.The scale of first part of this embolus has been represented 5 to 20% of voids volume.
Second of this embolus is exactly the water that injects partly, will contain 1 to 10% suitable water-soluble anionic surfactant in it, the surface active agent by 0 to 2%, low-molecular-weight alcohol by 0 to 5%, isopropyl alcohol for example is by 0 to 0.2% one water-soluble polymer with by 0 to 10% hydrocarbon.The scale of second part of this embolus has been represented 5 to 30% of voids volume.
The 3rd of this embolus partly is the water that injects, to contain suitable water-soluble cation surfactant of 0 to 5% in it, complementary surface active agent by 0.1 to 5%, low-molecular-weight alcohol by 0.5 to 10%, isopropyl alcohol for example, the water-soluble polymer by 0 to 0.2% and by 0 to 10% hydrocarbon.This embolus the 3rd scale partly is to have represented 5 to 30% of voids volume.
The 4th of this embolus partly is the water that injects, and will contain a complementary surface active agent of 0 to 3% in it, the low-molecular-weight alcohol by 0 to 3%, for example isopropyl alcohol and a water-soluble polymer of 0 to 0.2%.The scale of the 4th part of this embolus is to have represented 5 to 50% of voids volume.
Displacement embolus recited above is by the producing well that water is driven to by the injection that includes 0 to 0.2% water-soluble polymer.
Fig. 1 C and 2F meet the displacement test of carrying out according to the present invention, show with voids volume V
PThe unrecovered oil saturation ratio S of function representation
HR, the reservation degree A of anionic surfactant calculates with milligram/rock, with the porous media length L (centimetre) function representation.
Though what can see is that the deal of used surface active agent under each situation is all actual identical, the tendency of curve is all than Figure 1A, and the test of 1B and 2E has more advantages, and what we can see after a while also will be the same.Be the description of each example below.
Example one (test 1a, 1b, 1c)
Use the sandstone rock of obtaining by the oil field must make porous media, 95 ℃ or 100 the crust pressure carry out a series of tests.
Use following program:, again it is got in the stainless steel tube with the crushing of rock core sample.The characteristic of porous media has been listed in table one.Measured permeability to gas, with and when current are logical clay can being observed respectively that influence descends to measure of swelling to the infiltrative of the water in the reservoir.
1. inject water and oil
At first be that porous media is filled water in the rock stratum, oil field of having satisfied, its total salinity is 0.46%.Reinject oil in the reservoir of removing gas with this moisture content of displacement (s.t.o is 20 ℃ the time, and proportion is 0.809 grams per liter, viscosity 3.2mPaS).This water saturation that can not subtract again is 0.37 ± 0.01.And then be used in 100 crust and 95 ℃ the time oil of saturated reservoir gas replace this s.t.o.Gas/oil ratio rate of this moment is 54m
2/ m
3At last, the water displacement oil filtering rate with the injection of 0.40% salinity is one meter of every day.The unrecovered oil saturation ratio of this acquisition is 0.34 ± 0.01, promptly is that 46% oil is received the rate of adopting.
2, inject surface active agent
Use three formula methods:
Test 1a: after injecting water, an aqueous phase solution of representing 30% voids volume reinjects, it is formed by the injection moisture content that contains 3% petroleum sulfonate (petroleum-type have be equal to 460 mean atomic weight), represents the water of the injection of 100% voids volume to be advanced by one again.The average of unrecovered oil saturation ratio will drop to 0.23 by 0.34, be exactly to receive altogether to adopt 63% oil.
Test 1b:
After injecting water, an aqueous phase solution of representing 30% voids volume reinjects, it is made up of the water filling that contains 3% petroleum sulfonate, it is interior except that containing the petroleum-type molecule, 20% two or polysulfonate molecule (the equal mean molecule quantity of this mixture is 35 to 400) are arranged again, and the water that is equivalent to the injection of 100% voids volume by a volume is advanced again.The average of unrecovered oil saturation ratio drops to 0.19 by 0.34, promptly is that the summation receipts rate of adopting is 70%.
Test 1c:
After injecting water, the method according to the present invention, one after the other inject following displacement liquid:
1)-and dying the aqueous phase solution that alcohol oil is formed by containing 3% petroleum sulfonate of describing just like test 1b and 0.5%, its volume is 5% of a voids volume.
2)-by the aqueous phase solution that the water of the injection of describing as test 1b that contains 3% petroleum sulfonate is formed, its volume is 10% of a voids volume.
3)-by the aqueous phase solution that the water of the injection of the alcohol of the ethoxylation of describing just like test 1b that includes 2.45% petroleum sulfonate and 0.27% is formed, formula is R-O(CH
2-CH
2O)
nH, the R here one on average have straight string (aliphatic series) atomic group of 15 carbon atoms, and the average of n is 15 again; The volume of this water liquid is 15% of a voids volume.
4)-by the aqueous phase solution that the water of the injection of pure and mild 1% isopropyl alcohol that contains 0.41% ethoxylation is as the aforementioned formed, its volume is 10% of a voids volume.
This displacement embolus is to represent the water of the injection of 100% voids volume to be advanced by one.The average of unrecovered oil saturation ratio drops to 0.06 by 0.34, is exactly to receive altogether to adopt 90% oil.
After each test, take out porous media with boring method by the steel pipe place, it is cut into six minutes again, determine unrecovered oil saturation ratio S therein
HRReservation degree A with sulfonate.
Test 1a, 1b, the result of 1c is respectively at Figure 1A, 1B and 1c come out with the function representation of porous media length.Can know from each figure that the height oil of seeing test 1c is received and adopt rate, be because micellar solution in whole porous media length, all have high-effect, and this high-effect be will the beginning of the porous media of test 1a partly and test 1b in the middle of partly just can reach.
As demonstration, Fig. 3 shows the C that accompanies sulfonate to leave porous media
++ aAnd F
++ eThe elution of ion (concentration is represented with grams per liter) and be used in test micellar solution that 1c is injected and receive the volume E of the oil of adopting
R(contain oil amount and represent) to increase % after adopting.
Example two (test 2d, 2e, 2f)
Use the sandstone rock core sample that gets by the oil field, in displacement utensil, under 64 ℃ and 100 bar pressures, run test as example one.The characteristics of porous media show at table 1.
1, injects water and oil
At first use the water saturation porous media of total salinity 1% in the rock stratum, oil field.Then inject s.t.o (in the time of 20 ℃, proportion is 0.825 grams per liter, viscosity 3.8mpaS) the displacement moisture content in the reservoir.The moisture content saturation ratio that this can not subtract again is 0.37 ± 0.01.Replace s.t.o with the oil that contains reservoir gas again.This gas/oil ratio rate is 56 cubic metres/cubic metre.At last, with one meter rate of filtration every day, with the injection water displacement oil of salinity 0.6%.The unrecovered oil born of the same parents and the Du that are obtained are 0.25 ± 0.01, and 60% oil is received the rate of adopting exactly.
2, injecting carbon dioxide
After injecting water, inject the gas that equals 30% voids volume, it contains volume and accounts for 82% carbon dioxide, and injection pressure then is 100 crust, advances with the water that injects again.The unrecovered oil saturation ratio reduces to 0.20 by 0.25, and being received the oil of adopting by water and carbon dioxide exactly is 68%.Certainly at 100 bar pressures, all not reaching the optimum usefulness of carbon dioxide usually, also is a part of and receive the oil of adopting.But, it is selected that above condition may be based on economic reason.After example described here will be presented at these injections exactly, the usefulness of the micellar solution gained that reinjects was not inferior.
3, inject surface active agent
After injection water reinjects carbon dioxide, test two changing factors, first is according to method in early stage (test 2e), second is (test 2f) according to the present invention.
Test 2e: inject-be 45% of voids volume by including the aqueous phase solution volume of forming as the injection water of described 2% petroleum sulfonate of test 1b, be the injection water propelling of 100% voids volume again with volume.The unrecovered oil saturation ratio reduces to 0.10 by 0.20, exactly Zong the oil receipts rate of adopting is 84%.
Test 2f:, one after the other inject following displacement liquid according to the present invention:
1) inject-be equal to the aqueous phase solution of 20% voids volume, it is formed by injecting water, and it contains a kind of alkyl sodium sulfate ether sodium as test described 1.7% petroleum sulfonate of 1b and 0.04%, and its formula is R-O(CH
2CH
2O)
M-1CH
2CH
2-SO
4Na
The R here be go here and there always (aliphatic series) atomic group of 15 carbon atoms is on average arranged, and the average of m is 15.
2)-and the aqueous phase solution volume is 25% of a voids volume, and it is to be become by the water that injects, and it contains 1.7% petroleum sulfonate and the 0.36% aforesaid alkyl sodium sulfate ether sodium of describing as test 1b.
3)-and aqueous phase solution, volume is 10% of a voids volume, it is made up of the water that injects, and 0.23% alkyl sodium sulfate ether sodium of having described and 1.5% isopropyl alcohol arranged in it.
This displacement embolus is promoted by a water that is equal to the injection of 100% voids volume.The unrecovered oil saturation ratio reduces to 0.03 by 0.20, exactly Zong the receipts rate of adopting is 95%.
After each test, all shift out porous media from steel pipe with boring method, be cut into again six fens, determine unrecovered oil saturation ratio S therein
HRReservation degree A with sulfonate.From test 2d(Fig. 2 D), can see with behind the injecting carbon dioxide, with the mark V of voids volume
PThe unrecovered oil saturation ratio S of expression
HR(CO
2), on the length L (Cm) of whole porous media, all keep identical, and the unrecovered oil saturation ratio S after the water filling
HR(E) also be so, but after injecting surface active agent (test 2e and 2f), the distinctive change of distribution situation of unrecovered oil saturation ratio and sulfonate.
Fig. 2 E and 2F represent these distribution situations.The method of describing with the present invention obtains the high reason of receiving the rate of adopting significantly, is that but in test 2e, the effectiveness of surface active agent is confined to the first half of porous media because the unrecovered oil saturation ratio in the entire length of porous media all is reduced to minimumly.We can conclude that also exhausted most sulfonate is all stayed in the porous media in this test after.
At test 1a, 1b, 1c, in 2e and the 2f, the deal of used high price surface active agent in fact all is the same.Use process of the present invention, increase, all roughly can receive the oil of adopting and be compensated by increase by the value that causes with alcohol.Subordinate list 2 is clear to demonstrate the surface active agent consumption (with the volume of concentration % and injection, the phase product of % voids volume is expressed), total oil is received the increase (expressing with the % with early stage technology gained result) that the rate of the adopting % of oil amount (with the beginning time) and the present invention obtain.
Table two
The total receipts of testing surface activator consumption (disregarding alcohol) adopted the increase of rate than this test
（%×V
P） （%） 1a 1b 2e
1a
＊0.900 63
1b
＊0.900 70
1c
＊＊0.899 90 +42.9 +28.6
% %
2e
＊0.900 84
2f
＊0.886 95 +13.1
%
* early stage technology
*-according to of the present invention
Use the present invention, just need the reservoir rock of suitable cation exchange capacity (CEC).Except this needed, the reservoir conditions that can limit process of the present invention was applicable to the same of early stage technology with those.
Claims (10)
1, one is having suitable ion-exchange capacity, forms in the geologic structure of petroleum reservoir, improves the process of receiving quarrying oil.It is to inject a displacement embolus earlier, be applicable to oil is pushed into a minimum producing well, inject a water through a minimum notes well again and promote liquid, and this embolus contains anionic surfactant, and inject part in succession by each and formed, some comprises minimum a kind of anionic surfactant, and its solubility in injecting water is after the order of the embolus each several part of considering to inject into well, adjustment makes a part by embolus to another part, and solubility increases to some extent.
2, as the desired process of claim 1, the displacement embolus enters the part at first of annotating well and contains and can lower the assistant of anionic surfactant in the solubility of the water that injects.
3, as claim 1,2 desired processes, the displacement embolus enters the decline of annotating well, and containing can increase previous embolus and bring the surface active agent of rock stratum in the assistant of the solubility of water filling.
4, as claim 2 or 3 desired processes, comprise and reduce anionic surfactant in the area of the assistant of the solubility of water filling, 20 5 percent to percent the volume that occupies the rock stratum voids volume, and keep the area of the assistant that increases the solubility of anionic surfactant in water filling, occupy 50 5 percent to percent volume of rock stratum voids volume.
5, as the desired process of claim 4, lower the assistant of anionic surfactant solubility in water filling, contain the anionic surfactant to 10 of one of percentage by weight, it zero to 5 percent water solubles, by weight by the alcohol of zero to 5 percent high carbon atom number, one or the concentration of bivalent cation salt then be 0 to 0.05 mol, have by weight zero again to the water-soluble polymer of percent point two with contain zero to 10 hydrocarbon by weight.
6, as the desired process of claim 3, it increases the assistant of anionic surfactant solubility in water filling, contain zero minimum a kind of auxiliary surface activator to 3 percent weight, zero to low-molecular-weight alcohol of 3 percent weight and the zero by weight water-soluble polymer to percent point two.
7, as any one desired embolus that injects of above claim by two in succession part institute formed, first is an aqueous phase solution, contain one to 10 the anionic surfactant that dissolves in water filling by weight, minimum a kind of auxiliary surface activator of zero to 2 percent by weight, to increase anionic surfactant in the solubility of water filling, contain a low-molecular-weight alcohol of zero to 5 percent by weight again, zero by weight a water-soluble polymer to percent point two, zero to 30 percent hydrocarbon by weight, and the second portion that injects after a while is a water liquid, contain the zero by weight anionic surfactant that is dissolved in water filling to 5 percent height, minimum a kind of auxiliary surface activator of 0. 1 to 5 percent by weight, a low-molecular-weight alcohol of 0. 5 to 10 by weight, zero to a water-soluble polymer of percent point two and zero to 10 hydrocarbon by weight by weight.
8, as the desired process of claim 7, the volume of part earlier that two quilts inject part in succession is five to percent 30 of a rock pore volume, and to inject the volume of part also be five to percent 30 of rock pore volume in the back.
9, process as claimed in claim 1, first injecting carbon dioxide, the displacement embolus reinjects.
10, process as claimed in claim 1 is applied to the crude oil reservoir of cation exchange capacity (CEC) between 0. 1 to ten milliequivalents/100 gram rocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101888 CN85101888A (en) | 1985-04-01 | 1985-04-01 | From be infused in water, there is deliquescent micella surfactant solution to increase the method for receiving quarrying oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101888 CN85101888A (en) | 1985-04-01 | 1985-04-01 | From be infused in water, there is deliquescent micella surfactant solution to increase the method for receiving quarrying oil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85101888A true CN85101888A (en) | 1987-01-10 |
Family
ID=4792122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101888 Pending CN85101888A (en) | 1985-04-01 | 1985-04-01 | From be infused in water, there is deliquescent micella surfactant solution to increase the method for receiving quarrying oil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85101888A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216560A (en) * | 2009-12-16 | 2011-10-12 | 卢卡技术有限公司 | Biogenic fuel gas generation in geologic hydrocarbon deposits |
| CN103061725A (en) * | 2006-09-08 | 2013-04-24 | 英国石油勘探运作有限公司 | Hydrocarbon recovery process |
-
1985
- 1985-04-01 CN CN 85101888 patent/CN85101888A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061725A (en) * | 2006-09-08 | 2013-04-24 | 英国石油勘探运作有限公司 | Hydrocarbon recovery process |
| CN103061725B (en) * | 2006-09-08 | 2015-08-19 | 英国石油勘探运作有限公司 | hydrocarbon recovery process |
| CN102216560A (en) * | 2009-12-16 | 2011-10-12 | 卢卡技术有限公司 | Biogenic fuel gas generation in geologic hydrocarbon deposits |
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