CN102827595B - High-temperature profile control agent injected with steam - Google Patents
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000010795 Steam Flooding Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 20
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims description 39
- 239000007924 injection Substances 0.000 claims description 39
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims description 23
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 13
- 238000013019 agitation Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 6
- 230000002595 cold damage Effects 0.000 abstract description 5
- 229920000877 Melamine resin Polymers 0.000 abstract description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 25
- 238000012360 testing method Methods 0.000 description 21
- 230000009467 reduction Effects 0.000 description 20
- 238000002474 experimental method Methods 0.000 description 17
- 230000035699 permeability Effects 0.000 description 12
- 238000011084 recovery Methods 0.000 description 11
- 239000011435 rock Substances 0.000 description 11
- 238000002425 crystallisation Methods 0.000 description 10
- 230000008025 crystallization Effects 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000004576 sand Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- 238000002513 implantation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Abstract
The invention relates to a high-temperature profile control agent injected with steam, which comprises the following components in percentage by weight: 20 to 30 weight percent of melamine, 0.15 to 0.2 weight percent of polyacrylamide and the balance of water. The invention also relates to a preparation method of the high-temperature profile control agent injected with steam, which comprises the following steps: sequentially adding polyacrylamide and melamine into water under the conditions of normal temperature and normal pressure and stirring at the rotating speed of 60-120 revolutions per minute, and then continuously stirring at the rotating speed of 60-120 revolutions per minute for 30-60 minutes to obtain the high-temperature profile control agent injected with steam. The invention also relates to a high-temperature profile control method for steam flooding, which comprises the step of mixing the high-temperature profile control agent injected with steam with water vapor and injecting the mixture into a stratum. The high-temperature profile control agent injected with steam has the characteristics of high temperature resistance and strong plugging performance, and does not cause cold damage to a shaft pipe column and an oil layer.
Description
Technical field
The present invention relates to a kind of with vapour injection high temp profile control agent and preparation method thereof and its using method, belong to technical field of petroleum extraction.
Background technology
Liaohe Oil Field adopts the block of steam driving exploitation to mainly contain neat 40 pieces, bright and beautiful 45 pieces at present, shut out 229 and hollow 38 pieces etc., along with improving constantly of steam drive development degree, due to interlayer, in-layer heterogeneity and steam overlap, occur that oil reservoir longitudinally inhales the phenomenons such as vapour is uneven, steam vapour is altered, injecting steam is caused to lose in a large number, volumetric conformance efficiency reduces, and the moisture rising of recovery well, reduces steam injection exploitation effect.Therefore, altering that passage carries out profile control, envelope is altered to high permeability formation, vapour is improve one of vapour important measures of driving development effectiveness.
High temp profile control agent conventional at present mainly comprises inorganic particle type high temp amendment, gel-like high temp profile control agent and foam type high temp amendment.But there are some shortcomings when applying in three, although inorganic particle type high temp amendment is high temperature resistant, can only carry out shutoff in immediate vicinity of wellbore; There is temperature tolerance difference, easily by problem that steam is broken through in gel-type amendment; Foam type high temp amendment one is the requirement that the whipping agent temperature tolerance of at present application can't meet vapour and drives, and its formula needs to improve; Two is that the validity period of shutoff is short, macropore plugging effect is poor.As can be seen here, at present high temp profile control agent, plugging effect is poor, cannot meet steam flood profile control, envelope alter needs.
In addition, the conventional high temperature profile control operational procedure of current vapour driving oil recovery is: first stop steam injection, then inject high temp profile control agent, then recover steam injection.The shortcoming of this operation is that operational procedure is loaded down with trivial details, owing to injecting cold liquid, there is cold damage to shaft column and oil reservoir, and renwing stratum temperature needs to consume a large amount of steam, affects normal production and the steam flooding efficiency of well pattern.Method with steam injection high temp profile control agent can improve sweep efficiency and the efficiency of displacement of injecting steam, but technique requires that the high temp profile control agent adopted has high temperature-resistance characteristic.
200810094207.4 a number patent application discloses a kind of based on polyacrylamide, trimeric cyanamide and formaldehyde are the polymeric system of linking agent, it belongs to gel-like high temp profile control agent, has the feature of good stability heat-resistant salt-resistant, is applicable to the shutoff on 30 DEG C of-110 DEG C of stratum.But in steam drive oil production process, the temperature of water vapor reaches 350 DEG C, and therefore it cannot meet the requirement of steam drive oil production.The high temp profile control agent that steam drive reservoir uses needs high temperature resistant, and sealing characteristics is strong, can realize earth formation deep fluid diversion, can not cause cold damage to shaft column and oil reservoir.
Therefore, develop a kind of have high temperature tolerance and seal-off effect with steam injection high temp profile control agent, be still one of this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of with vapour injection high temp profile control agent, it has high temperature resistant, the feature that sealing characteristics is strong, and can not cause cold damage to shaft column and oil reservoir.
The present invention also aims to provide above-mentioned and inject the preparation method of high temp profile control agent and a kind of high-temperature profile control method of steam flood with vapour.
For reaching above-mentioned purpose, the invention provides a kind of with vapour injection high temp profile control agent, by weight percentage, it comprises: trimeric cyanamide 20wt%-30wt%, polyacrylamide 0.15wt%-0.2wt%, and surplus is water.
According to specific embodiment of the invention scheme, preferably, in above-mentioned high temp profile control agent, described polyacrylamide is partially hydrolyzed polyacrylamide, and its molecular weight is 1.2 × 10
7, degree of hydrolysis is 23%.
The present invention adopts trimeric cyanamide to inject the host of high temp profile control agent as with vapour, and trimeric cyanamide stable chemical nature, can be dissolved in hot water, but insoluble or be slightly soluble in cold water; Solvability variation with temperature and obvious change occurs, does not dissolve in crude oil.At ambient pressure, fusing point is 354 DEG C to trimeric cyanamide, and rapid heating can distil, and sublimation temperature is 280-300 DEG C, fast cooling meeting crystallization, and the mixed solution quenching as about 320 DEG C is down to 180-220 DEG C, has mass crystallization and separates out.Trimeric cyanamide as the host injecting high temp profile control agent with vapour, is adopted the higher dosage of 20wt%-30wt% by the present invention, and what make it obtain is applicable to steam drive reservoir with vapour injection high temp profile control agent.In addition, the present invention is using polyacrylamide as the assistant agent injecting high temp profile control agent with vapour, and it has been rolling action.Polyacrylamide solution has certain viscosity, and melamine particles can be suspended in wherein in this solution, and is carried and is injected in pit shaft.
The wetting vapour being added to injection with vapour injection high temp profile control agent of the present invention, and the oil reservoir district of heat is sent to together with high-temperature water vapor (reaching 350 DEG C).With the injection of water vapor, constantly advance with vapour injection high temp profile control agent and steam, owing to there is most permeable zone band in stratum or vapour alters passage, and the speed of steam and water mixture is more much bigger than the speed of temperature leading edge, marginal zone before being easy to just to alter passage arrival temperature along most permeable zone band or vapour with vapour injection high temp profile control agent and steam.When the heat exchange of this front marginal zone is reduced to certain temperature, at this temperature, to inject the trimeric cyanamide of high temp profile control agent at hole crystallization with vapour and form a material band, reduction high permeability zone or vapour alter rate of permeation and the porosity of passage, change the trend of injecting steam, thus reach and alleviate vapour and alter, eliminate inter-well interference, expand injecting steam swept volume, make oil reservoir in the vertical or in plane development degree even, reach the object improving steam drive development effect.Due to the carrying out of steam flood, temperature leading edge continues expansion, and crystalline material will again distil or dissolve, so cause blocking to be temporary transient with reversible by trimeric cyanamide crystallization.Accordingly, the trimeric cyanamide of dissolving reaches marginal zone before temperature again, here separates out again, again blocks vapour and alter passage.
The present invention also provides the above-mentioned preparation method injecting high temp profile control agent with vapour, it comprises the following steps: under the rotating speed agitation condition of normal temperature, normal pressure, 60-120 rev/min, successively polyacrylamide and trimeric cyanamide are added to the water in order, continue the rotating speed continuously stirring 30-60 minute with 60-120 rev/min afterwards, obtain described with vapour injection high temp profile control agent.
The present invention also provides a kind of high-temperature profile control method of steam flood, it comprises the following steps: take well mouth oil pipe as threeway, water receiving steam injection pipeline on one side, the hard tube line of tape splicing check valve is connected with injection pump on one side, while water filling steam, injected by injection pump above-mentioned with vapour injection high temp profile control agent, inject high temp profile control agent with vapour and mix at oil pipe with water vapor, brought in stratum by water vapor simultaneously.
In the present invention, the consumption injecting high temp profile control agent with vapour can control according to the geological condition of oil well, the amount difference that different wells is used.According to on-site experience, preferably, with vapour inject high temp profile control agent consumption by
calculate, in formula, r
1for injecting the placement position (degree of depth) of high temp profile control agent with vapour, unit is m; L is the slug length injecting high temp profile control agent with vapour, and unit is m; H is shutoff zone of interest thickness, and unit is m;
for porosity, unit is %.The placement position injecting high temp profile control agent with vapour is steam-front position (this position temperature is 180 DEG C), and the slug length injecting high temp profile control agent with vapour is the 2%-8% of well spacing.
According to specific embodiment of the invention scheme, preferably, in the high-temperature profile control method of above-mentioned steam flood, the method for implanting adopted is continuous steam injection or intermittent steam injection.Wherein, described continuous steam injection is continually in stratum, inject water vapor always; Described intermittent steam injection for stopping for some time after a certain amount of water vapor of note, and then then injects water vapor, so repeatedly.Proportionlity is not had between the amount injecting high temp profile control agent with vapour of the amount of water vapor injected and injection.
According to specific embodiment of the invention scheme, preferably, in the high-temperature profile control method of above-mentioned steam flood, described mixing water steam and the step with vapour injection high temp profile control agent are carried out on earth's surface or in down-hole.
Trimeric cyanamide provided by the invention is the high temp profile control agent of host, it has high temperature resistant, the advantage that sealing characteristics is strong, it can be injected into oil reservoir with steam, crystallization in the hole of earth formation deep, realize earth formation deep fluid diversion, effective shutoff most permeable zone and vapour alter passage, expand steam swept volume, thus solve that the suction vapour occurred in steam-drive process is uneven, steam vapour alters problem, improve steam drive development effect, and avoid the cold damage that shaft column and oil reservoir are caused.In addition, of the present inventionly inject high temp profile control agent with vapour and also have that preparation method is simple, the advantage of easy handling.
Accompanying drawing explanation
Fig. 1 is the graph of a relation injecting high temp profile control agent temperature and reduction ratio under different injection rate with vapour of test case 1.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment
The present embodiment provides a kind of and injects high temp profile control agent with vapour, and by weight percentage, it comprises: trimeric cyanamide 30wt%, polyacrylamide 0.15wt%, and surplus is water.
What the present embodiment provided inject the preparation method of high temp profile control agent with vapour comprises the following steps: under normal temperature, normal pressure, the rotating speed agitation condition of 80 revs/min, successively polyacrylamide and trimeric cyanamide are added to the water in order, continue the rotating speed continuously stirring 30 minutes with 80 revs/min afterwards, obtain describedly injecting high temp profile control agent with vapour.
The polyacrylamide that the present embodiment uses is partially hydrolyzed polyacrylamide, and its molecular weight is 1.2 × 10
7, degree of hydrolysis is 23%; The trimeric cyanamide used is analytical pure, and Shanghai reagent stations chemical reagent work produces, and molecular weight is 126.12.
Test case 1 injects the evaluation of the crystallizing power of high temp profile control agent with vapour
This test case is tested and assessed to the crystallizing power with vapour injection high temp profile control agent that embodiment provides.
This test case uses natural core, and uses simulated formation water as displacement liquid.
The experimental installation with vapour injection high temp profile control agent that this test case adopts is that steam drives physical simulating device, and this product is manufactured by Haian Oil Scientific Research Apparatus Co., Ltd..
The experimental technique reference standard SY/T5345-2007 of this test case, it specifically comprises the following steps:
1., after rock core measures rate of permeation, weigh in the balance heavily, after recording quality, put it into and find time in wide-necked bottle, find time continuously (vacuum tightness 133Pa) more than 5h, afterwards saturation experiments water; And then weigh, calculate the volume of saturation water in rock core with minusing, calculate rock pore volume and porosity;
2. loaded in high pressure core holding unit by the rock core of saturation, add ring pressure, ring pressure should higher than model inlet pressure 2MPa, and (this simulated formation water type is NaHCO to survey rate of permeation with simulated formation water
3type, total mineralization is 2579mg/L, Na
++ K
+ion content is 727mg/L, HCO
3 -ion content is 1318mg/L, Cl
-ion content is 313.88mg/L);
3. open thermostat container, according to different experimental programs, model is heated to experimental temperature, and retaining ring (enclosing) pressure is stable, after calorstat temperature arrives design temperature, more than constant temperature 5h, then with constant speed (according to these experiment needs, injection speed is 2mL/min) by a certain amount of embodiment with vapour inject high temp profile control agent inject rock core, separate out in solid form to impel material, ensure the saturation ratio reaching desired substance in hole, rock core is cooled to 20 DEG C, cool 24 hours, the rate of permeation of rock core after measuring tempeature reduces, and compared with original permeability, rate of permeation/original permeability after saturated with the reduction ratio r=material of following formula calculating rate of permeation.
First evaluate this and inject the crystallizing power of high temp profile control agent at porous medium with vapour, namely add and inject with vapour the degree that high temp profile control agent makes permeability reduction.Rock core is put into core holding unit, under a certain pressure, be heated to 150 DEG C, 170 DEG C, 190 DEG C, 200 DEG C, 210 DEG C, 220 DEG C, 230 DEG C and 240 DEG C respectively, what provide in the above-mentioned embodiment injecting 0.5PV, 1PV, 1.5PV and 2.0PV at each temperature respectively injects high temp profile control agent with vapour.Shown in Figure 1, Fig. 1 is the graph of a relation injecting high temp profile control agent temperature and reduction ratio under different injection rate with vapour of test case 1.
The research such as Liu Junrong shows: below 400 DEG C, the change of temperature only has the increase of trace to rate of permeation, and this change negligible (" experimental study of On Relation Between Temperature And Rocky Permeability ", Liu Junrong etc., [J] University of Petroleum journal, 2001,25 (4)).Therefore, in the temperature range that this test case adopts, the impact of change for rate of permeation of temperature can be ignored.
As can be seen from Figure 1, the reduction ratio of rate of permeation with temperature and injection rate increase and reduce, namely injecting with vapour makes rate of permeation reduce with the increase of temperature and injection rate adding of high temp profile control agent, this is because: (1) at high temperature, the solubleness of trimeric cyanamide is large, the quantity can dissolving trimeric cyanamide in solution is many, it is large that simultaneous temperature reduces amplitude, the crystallization of trimeric cyanamide may be promoted, so the trimeric cyanamide that temperature reduction post crystallization goes out is more, and then crystallization go out with vapour inject high temp profile control agent more, larger on the reduction degree impact of rate of permeation, (2) the PV number injected is high, can ensure the quantity of trimeric cyanamide, guarantees that trimeric cyanamide can sufficient crystallising.It can also be seen that from Fig. 1, under low temperature, the increase of temperature is large on the impact of reduction ratio, and permeability reduction Amplitude Ratio is comparatively large, and when after 220 DEG C, reduction amplitude diminishes gradually; When being injected to 0.5PV with vapour injection high temp profile control agent, reduction ratio reduces with the increase of temperature, but curve is comparatively mild, does not reduce significantly, and when injection rate is more than 1PV, lowers amplitude just larger.For ensureing to inject with vapour the effect that high temp profile control agent reduces rate of permeation, injection rate should be greater than 1PV, and implantation temperature should higher than 220 DEG C.
The reversibility evaluation that the rate of permeation that test case 2 injects high temp profile control agent with vapour reduces
This test case demonstrates the reversibility reduced with core permeability after vapour injection high temp profile control agent adding embodiment and provide, and tests respectively from lower than with the direction higher than initial implantation temperature.
First get the rock core that two rate of permeation are similar, at 170 DEG C with embodiment provide with vapour inject high temp profile control agent saturated, measure rate of permeation after cooling.The injection experiments equipment that this test case adopts is with test case 1.One of them rock core is heated to 100 DEG C, and injects 100 DEG C of hot water of l or 2PV, measure rate of permeation after cooling and calculate reduction ratio according to original permeability; Afterwards temperature is risen to 150 DEG C, 150 DEG C of hot water of l or 2PV that reinject, survey its rate of permeation and reduction ratio.In addition, another one rock core is heated to 190 DEG C, injects 190 DEG C of hot water of l or 2PV, measure rate of permeation after cooling and calculate reduction ratio, afterwards temperature being raised to 220 DEG C, 240 DEG C and repeating above-mentioned experiment.Experimental result is see table 1.
As can be seen from Table 1, when injecting hot water lower than 170 DEG C, rate of permeation and reduction ratio become large, and increase with the increase of implantation temperature and injection rate, but rangeability is little, and 100 DEG C time, reduction ratio is 0.76, and rate of permeation increase only 0.059 μm
2; When injecting the hot water higher than 170 DEG C, rate of permeation is close to original permeability, and reduction ratio is between 0.9-1, and the temperature injected is higher, and reduction ratio is more close to 1, and injection rate is larger, less with the gap of original permeability.What this test case explanation embodiment provided in the temporary crystallization of porous medium, namely can have reversibility to the reduction of rate of permeation with vapour injection high temp profile control agent.
The reversible experiment result that table 1 rate of permeation reduces
Test case 3 injects the lab simulation parallel two-tube oil displacement experiment of high temp profile control agent with vapour
The restraining effect of altering steam overlap, vapour at steam-drive process with vapour injection high temp profile control agent that this test case provides for Evaluation operation example, devises fill out sand tube oil displacement experiment in parallel to simulate heterogeneous reservoir.
This test case uses the fill out sand tube of the quartz sand filling of two different rate of permeation, and its length is 30cm, and diameter is 2.5cm, adopts constant speed displacement to carry out steam displacement test at 240 DEG C, injects the injected slurry volume 1PV of high temp profile control agent in experiment with vapour.The injection experiments equipment that this test case adopts is with test case 1.The experimental technique reference standard SY/T5345-2007 of this test case, it comprises the following steps:
1. saturation experiments water after the fill out sand tube of above-mentioned two different rate of permeation being vacuumized, measure volume of voids and porosity, and perm-plug method and water phase permeability, then viscous crude (experiment oil is Liaohe Oil Field dewatered oil) displacement is used, until the liquid of displacing oneself is not moisture, namely in fill out sand tube without moveable water, thus setting up irreducible water saturation, calculating initial oil saturation;
2. be placed on same plane by these two fill out sand tube parallel connections, import and export and connect same pressure system, at 240 DEG C, first carry out steam flood for experiment, steam flood is to mold exit end moisture more than 80%, and calculation of steam drives recovery ratio;
3. experimentally scheme inject 1PV with vapour inject high temp profile control agent, continue steam flood to mold exit end moisture more than 80%, calculate recovery ratio.
The calculation formula of the experimental results such as the porosity in above-mentioned experiment, initial oil saturation and recovery ratio is as follows:
φ＝V
p/V
f；
S
o＝V
o/V
p；
η
recovery ratio=V
c/ V
o;
In formula,
η
recovery ratio---recovery ratio, %
---porosity, %
V
p---volume of voids, cm
3
V
f---fill out sand tube volume, cm
3
S
o---initial oil saturation, %
V
o---saturated crude oil volume, cm
3
V
c---extraction crude oil volume, cm
3
Experimental result, see table 2, as can be seen from table 2 experimental result, is injected after injecting high temp profile control agent with vapour and is had obvious oil increasing effect.Inject before high temp profile control agent injects with vapour, steam flood recovery percent of reserves is 46.57%, and inject injecting after high temp profile control agent with vapour of 1PV, recovery ratio improves 10.86%, and wherein low-permeability layer increase rate is large, is 20.6%.Its major cause is, in most permeable zone, duct is comparatively large, and the trimeric cyanamide injecting high temp profile control agent with vapour can play good plugging effect in macropore crystallization, and rate of permeation is larger, and plugging action is more obvious.This experiment proves: what embodiment provided inject with vapour, and high temp profile control agent can suppress steam overlap, vapour alters phenomenon, improves sweep efficiency and the recovery ratio of steam flood.
Table 2 two-tube displacement of reservoir oil simulated experiment result
Claims (5)
1. inject a high temp profile control agent with vapour, by weight percentage, it comprises: trimeric cyanamide 20wt%-30wt%, polyacrylamide 0.15wt%-0.2wt%, and surplus is water;
Wherein, described polyacrylamide is partially hydrolyzed polyacrylamide, and its molecular weight is 1.2 × 10
7, degree of hydrolysis is 23%;
Describedly inject high temp profile control agent with vapour and prepare by the following method: under the rotating speed agitation condition of normal temperature, normal pressure, 60-120 rev/min, successively polyacrylamide and trimeric cyanamide are added to the water in order, continue the rotating speed continuously stirring 30-60 minute with 60-120 rev/min afterwards, obtain described with vapour injection high temp profile control agent.
2. the high-temperature profile control method of a steam flood, it comprises the following steps: take well mouth oil pipe as threeway, water receiving steam injection pipeline on one side, the hard tube line of tape splicing check valve is connected with injection pump on one side, while water filling steam, is injected inject high temp profile control agent with vapour by injection pump, inject high temp profile control agent with vapour to mix at oil pipe with water vapor, brought in stratum by water vapor, wherein, described is according to claim 1 with vapour injection high temp profile control agent with vapour injection high temp profile control agent simultaneously.
3. the high-temperature profile control method of steam flood as claimed in claim 2, wherein, the described injection rate injecting high temp profile control agent with vapour by
calculate, in formula, r
1for injecting the placement position of high temp profile control agent with vapour, unit is m; L is the slug length injecting high temp profile control agent with vapour, and unit is m; H is shutoff zone of interest thickness, and unit is m;
for porosity, unit is %.
4. the high-temperature profile control method of steam flood as claimed in claim 2 or claim 3, wherein, described method for implanting is continuous steam injection or intermittent steam injection.
5. the high-temperature profile control method of steam flood as claimed in claim 2 or claim 3, wherein, described mixing water steam and the step with vapour injection high temp profile control agent are carried out on earth's surface or in down-hole.
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| CN105801760B (en) * | 2016-04-19 | 2018-07-13 | 中国石油天然气股份有限公司 | High-temperature-resistant profile control agent and preparation method thereof |
| CN105860947B (en) * | 2016-04-19 | 2018-10-16 | 中国石油天然气股份有限公司 | Slowly-degradable high-temperature-resistant high-salinity profile control agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4903767A (en) * | 1988-12-30 | 1990-02-27 | Mobil Oil Corporation | Selective gelation polymer for profile control in CO2 flooding |
| JPH09302198A (en) * | 1996-05-09 | 1997-11-25 | Mitsui Cytec Kk | Highly viscous aqueous fluid composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9096790B2 (en) * | 2007-03-22 | 2015-08-04 | Hexion Inc. | Low temperature coated particles comprising a curable liquid and a reactive powder for use as proppants or in gravel packs, methods for making and using the same |
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| US4903767A (en) * | 1988-12-30 | 1990-02-27 | Mobil Oil Corporation | Selective gelation polymer for profile control in CO2 flooding |
| JPH09302198A (en) * | 1996-05-09 | 1997-11-25 | Mitsui Cytec Kk | Highly viscous aqueous fluid composition |
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| 于涛等.油田化学剂.《油田化学剂》.石油工业出版社,2008,(第二版), * |
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| CN102827595A (en) | 2012-12-19 |
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