CN102392627B - Method for improving oil field recovery rate - Google Patents
Method for improving oil field recovery rate Download PDFInfo
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Abstract
The invention relates to a method for improving the oil field recovery rate. The method for improving the oil field recovery rate is characterized by using profile control and deep flow diversion dual functional blasting type pre-cross-linked gel particles for improving the oil field recovery rate, wherein the profile control and deep flow diversion dual functional blasting type pre-cross-linked gel particles are gel particles formed by initiating polymerization cross-linking of a monomer, a stable cross-linking agent and an unstable cross-linking agent by an initiator, and drying and grinding the obtained main gel. In reservoir production operation, when the method for improving the oil field recovery rate by pre-cross-linked gel particles for profile control and deep flow diversion, provided by the invention, is used, dual effects of profile control and deep flow diversion can be realized, and simultaneously, the blasting time of the pre-cross-linked gel particles can be controlled by adjusting the concentrations of the stable cross-linking agent and the unstable cross-linking agent, thereby achieving the purpose of controlling the operation period.
Description
Technical field
The present invention relates to a kind of method that improves oil recovery rate, relate in particular to a kind of profile control and deep flooding fluid of utilizing and turn to difunctional explosion type pre-crosslinked gel particle to improve the method for oil recovery rate, belong to technical field of petroleum extraction.
Background technology
Along with continually developing of oil field, Reservoir Heterogeneity is more and more serious, and injected water washes away in a large number, and oil reservoir clay and cement expand, corrosion, and fine migration shakes out to increase the weight of to wait and all can cause geology heterogeneous body situation further to worsen.Often show on stream following problem: horizontal contradiction is outstanding, plane injected water is along the high permeability zone formation water channel of advancing by leaps and bounds; Interlayer contradiction is outstanding, produces that to inhale section inhomogeneous, has the individual layer phenomenon of advancing by leaps and bounds on longitudinally; Underground viscosity of crude is high, and viscosity ratio of oil and water is large, and Character of Viscous Finger is serious etc.
At present, east oilfields has all entered high water-cut stage mostly, and the recovery ratio that how to improve high water-cut stage is oil circle question of common concern.In recent years, though the tertiary oil recovery measures such as polymer flooding have obtained good effect, also there is the problems such as displacement of reservoir oil cost is high, field conduct difficulty is large; For serious heterogeneity, there is the oil reservoir of high permeable strip or " macropore ", still exist part well to alter poly-serious problem, affect the poly-effect of note, and due to the limitation of polymer itself, make its effective viscosity loss in the stratum of high temperature, high salinity very large, often do not reach expection object.Ternary composite driving technology is also widely used gradually at old fileds such as grand celebrations, ternary composite driving utilizes the effect of decreasing by surfactant interfacial tension that capillary force is significantly reduced, profit reaches mixed phase and flows, thereby the residual oil in startup low-permeability oil deposit, but there is Similar Problems in ternary composite driving technology and polymer flooding: shear shinning, affected by reservoir condition, and polymer flooding and ternary composite driving all can pollute oil-containing low infiltration layer, make follow-up water drive can not reach best effect.
Deep flooding fluid turns to the deficiency that can overcome above-mentioned technology with profile control agent, first profile control agent can macropore plugging and high permeability zone, forces injected water to enter hyposmosis residual oil district, secondly along with the expansion of Profile Modification Depth, can make injected water enter residual oil area, deep, start more multiresidue oil.At present conventional profile control agent has two classes, the one, gel-like, the 2nd, particulate species.
Gel-like profile control agent comprises body gel, weak gel and colloidal dispersed gel.The function of body gel is mainly the high strength water breakthrough passage of shutoff near wellbore zone, because form is semi-solid state, therefore cannot go deep into stratum, is applicable to crack, near wellbore zone and high permeability zone shutoff; Weak gel is taking intramolecular crosslinking as main, and intermolecular cross-linking is auxiliary, forms the weak three-dimensional net structure of crosslinking degree, there is the feature of the dehydration of body gel, have certain integrality, can flow, but the distance of going deep into stratum is limited, can not reach the effect that deep flooding fluid turns to; Colloidal dispersed gel is by the gel rubber system of the non-three-dimensional net structure of the polymer of low concentration and crosslinking agent formation, because the concentration of polymer and crosslinking agent is low, the intermolecular chance bumping is few, the tridimensional network of unlikely formation intermolecular cross-linking, the main colloidal particle being made up of the polymer coils of intramolecular crosslinking is dispersed in aqueous medium, forms the thermodynamic stable system with gel attribute and colloidal nature, and this system does not have globality, there is no shape, can flow.The feature of colloidal dispersed gel is: cost is low, and gelation time is long, is applicable to deep profile controlling and the displacement of reservoir oil, is not suitable for crack and macropore, and the applicable reservoir temperature limit is 94 DEG C, clear water preparation, bad adaptability.
Particulate species gel comprises polymer microballoon, volume expansion grain, flexible particle and microcapsules etc., and it adopts the method for precrosslink to have good heat-resistant salt-resistant, shear-stable ability.The expansion rate of polymer microballoon is subject to the impact of formation water salinity, and the average grain diameter of the microballoon after expansion is tens sub-micron, shut-off capacity a little less than; Volume expansion grain can carry out particle diameter adjustment according to different reservoir conditions, and expansion multiple is affected by formation water salinity, makes intensity influenced less, and because volume expansion grain particle diameter is larger, what therefore deep flooding fluid turned to is limited in one's ability.Flexible particle can be migrated in duct, distortion is passed through, produce temporarily stifled dynamic resistance, there is pulsation phenomenon, can realize deep flooding fluid turns to, the proportion of flexible particle can be adjusted according to the proportion of oilfield injection water, and particle diameter can regulate according to the size in oil field stratum " macropore " and crack.Flexible particle can form dynamic plugging at oil deposit deep part, but for nearly well because current high strength is washed away the crack and the superelevation permeable formation that cause, must use high strength blocking agent to carry out anti-channeling operation, can not be brought into play to greatest extent otherwise compliance steer agent improves the effect of recovery ratio.
In sum, up to the present, in the water plugging and profiling technology of oil exploitation, profile control, deep flooding fluid turn to and can not synchronously carry out, and having no any prior art can address this problem.
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 method that improves oil recovery rate, by adopting profile control and deep flooding fluid to turn to difunctional explosion type pre-crosslinked gel particle to improve oil recovery rate, can greatly improve the recovery ratio in the oil field of high water-cut stage.
For achieving the above object, first the present invention provides a kind of method that improves oil recovery rate, it is that a kind of profile control and deep flooding fluid of adopting turns to difunctional explosion type pre-crosslinked gel particle to improve the method for oil recovery rate, wherein, to turn to difunctional explosion type pre-crosslinked gel particle be to be caused and the body gel drying that obtains of polymerization crosslinking occurs grind the gel particle forming through initator by monomer, labile cross linker and astable crosslinking agent for above-mentioned profile control and deep flooding fluid.
In the method for above-mentioned raising oil recovery rate provided by the invention, preferably, body gel is first to use labile cross linker and monomer under the initiation of initator, to carry out precrosslink to form stable cross-linked particles, then uses astable crosslinking agent under the initiation of initator, formed stable cross-linked particles to be cross-linked again and the body gel that obtains.The addition of adjusting astable crosslinking agent can make precrosslink particle under specific reservoir temperature, at the appointed time implosion is broken into microparticle, therefore for different reservoir medias, the astable crosslinking agent that adopts variable concentrations, can make the hydrolysis time of pre-crosslinked gel particle and temperature adjust according to different oil reservoir situations.
Fig. 1 is the action principle schematic diagram of pre-crosslinked gel particle of the present invention in oil reservoir.As can be seen from Figure 1, when pre-crosslinked gel particle injects after oil reservoir, the pre-crosslinked gel particle expanding is first macropore plugging and superelevation permeable formation in oil reservoir near wellbore zone, make injected water enter low-permeability layer district and start residual oil, the pre-crosslinked gel particle of expansion keeps can under reservoir temperature effect, being decomposed into micron order gel particle and submicron order gel particle after shape a period of time.This generated in-situ micron order and submicron order gel particle can continue to move into oil deposit deep part, and owing to being under oil reservoir environment and specifying blasting time after (blasting time is controlled and can reach by adjusting gel component), gel particle just can be degraded into micron order and submicron order gel particle.Fig. 2 is the mechanism schematic diagram of expansion and the decomposition of pre-crosslinked gel particle of the present invention.As can be seen from Figure 2, gel particle expands in formation water solution, under certain formation temperature and pH value condition, and astable crosslinked fracture, particle deformation becomes micron order and submicron order gel particle, can improve sweep efficiency.This shows, pre-crosslinked gel particle provided by the present invention can be realized the combination of the function of near wellbore zone high permeability zone shutoff and oil deposit deep part fluid diversion.
In the method for raising oil recovery rate provided by the present invention, the monomer that pre-crosslinked gel particle adopts is preferably acrylamide, or the mixture of acrylamide and acrylic acid and/or other monomer, wherein, in the time adopting acrylamide to mix mutually with acrylic acid, the mass ratio of the two may be controlled to 9: 1, and in the time adopting other monomer, its addition is identical with acrylic acid.In above-mentioned composition, taking acrylamide as main, can add as required a certain proportion of acrylic acid and/or other monomer simultaneously, with acrylamide generation copolyreaction, can make gel not degrade within a certain period of time, keep integrality.
According to concrete technical scheme of the present invention, preferably, other above-mentioned adopted monomer comprises 2-acrylamide-2-methylpro panesulfonic acid sodium salt (AMPS), methacrylic acid (methacrylic acid), maleic acid (maleic acid), 2-acrylic acid (2-Propenoic acid), sulfopropyl acrylic acid (sulfopropyl acrylic acid), one or more in dimethylaminoethylacmethyl methyl chloride (dimethylaminoethylacrylate methyl chloride quaternary salt) and dimethyl diallyl ammonium chloride (diallyldimethyl ammonium chloride) etc.
According to concrete technical scheme of the present invention, preferably, the labile cross linker that pre-crosslinked gel particle adopts comprises one or more in 2-acrylamide-2-methylpro panesulfonic acid sodium salt, divinyl acid esters, GDMA, acrylic acid trimethyl propane trimethyl ester and methene base bisacrylamide etc.
According to concrete technical scheme of the present invention, preferably, the astable crosslinking agent that pre-crosslinked gel particle adopts comprises polyethyleneglycol diacrylate (polyethylene glycol diacrylate), polyethylene glycol dimethacrylate (polyethylene glycol dimethacrylat), polyethylene glycol, polypropylene glycol diacrylate (polypropylene glycol diacrylate), glycol diacrylate (ethylene glycol diacrylate), three methanol-based propane three acrylic acid fat (trimethylopropane trimethacrylate), ethyoxyl tri methylol triacrylate (ethoxylatedtrimethylol triacrylate), one or more in ethyoxyl tetramethylol methane tetraacrylate (ethoxylated pentaerythritol tetracrylate) and their derivative etc.
According to concrete technical scheme of the present invention, the initator that pre-crosslinked gel particle adopts is preferably potassium sulfate (K
2s
2o
8), one or more in ammonium persulfate and tetramethylethylenediamine (TMEDA) etc., more preferably ammonium persulfate.Above-mentioned initator is used for monomer A M to inspire polymerisation, is all normal starter, and the concentration of initator can be also conventional amount used.In twice polymerization crosslinking process, each time when polymerization crosslinking described in the mass ratio of initator and described monomer all may be controlled to 1: 300-5000.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, the ratio of labile cross linker and monomer is 1: 200-8000, this monomer refers to the monomer with this labile cross linker generation polymerization crosslinking.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, the mass ratio of astable crosslinking agent and monomer is 1: 300-3000, this monomer refers to the monomer with this astable crosslinking agent generation polymerization crosslinking.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, the mass ratio of initator and monomer may be controlled to 1: 300.
According to concrete technical scheme of the present invention, preferably, the particle diameter of pre-crosslinked gel particle of the present invention is 100-120 order, about 125-150 μ m.
The temperature range for hydrolysis of the pre-crosslinked gel particle that polymerization provided by the present invention obtains is larger, for different oil reservoirs, can have different hydrolysis times.
In the method for raising oil recovery rate provided by the present invention, preferably, profile control and deep flooding fluid turn to difunctional explosion type pre-crosslinked gel particle to prepare according to following steps:
(1) acrylamide (in the time adopting acrylic acid and other monomer, can add in the lump) is added in distilled water and fully dissolved, obtaining mass percent is monomer the first solution of 10%-50%;
(2) taking distilled water as solvent, preparation obtains the labile cross linker solution of concentration as 0.01%-0.1%;
(3) labile cross linker solution is added in monomer the first solution to (ratio of the two can be determined by the mass ratio of labile cross linker and monomer, labile cross linker and with the mass ratio of the monomer of its generation polymerization crosslinking be 1: 200-8000), obtain the first mixed solution;
(4) purify 15-60 minute to nitrogen injection in the first mixed solution;
(5) to adding initator through in the first mixed solution of nitrogen purge, after stirring, the insulating box of putting into 45-80 DEG C is incubated 5-12 hour, obtains the gel piece of plastic;
(6) gel piece be cut into small pieces and be dried, obtaining stablizing cross-linked gel piece;
(7) acrylamide (in the time adopting acrylic acid and other monomer, can add in the lump) is added in distilled water and fully dissolved, obtaining mass percent is monomer the second solution of 10%-50%;
(8) the astable cross-linking agent solution taking distilled water as solvent compound concentration as 0.1%-1%;
(9) astable cross-linking agent solution is added in monomer the second solution to (ratio of the two can be definite with the mass ratio of monomer by astable crosslinking agent, astable crosslinking agent and with the mass ratio of the monomer of its generation polymerization crosslinking be 1: 200-8000), stir 2-4 hour until solution is completely even;
(10) purify 15-60 minute to nitrogen injection in solution;
(11) in solution, add the initator of 0.1g, and stir 2-4 hour until completely even, form the second mixed solution;
(12) the stable cross-linked gel piece of drying is ground to form to particle, obtain stablizing cross-linked gel particle;
(13) will stablize cross-linked gel particle and put into the second mixed solution of step (11), leave standstill 24 hours;
(14) mixed solution step (13) being formed is put into the insulating box of 60 DEG C and is incubated 24 hours, obtains body gel, obtains profile control and deep flooding fluid turns to difunctional explosion type pre-crosslinked gel particle after drying and grinding.
In above-mentioned preparation method provided by the invention, preferably, synthetic body gel repeats 3 times and expands, purify, dry process, to purge the impurity in gel, expansion can be carried out in distilled water, then make body gel be dried at 60 DEG C, dry body gel after purification grinds to form granule, after sieve series, obtain dry gel particle, then this dry gel particle adds in astable cross-linked gel solution and carries out secondary cross-linking, the astable gel that secondary cross-linking forms is cross-linked in the outside of stablizing cross-linked particles, thereby obtain body gel.
According to concrete technical scheme of the present invention, in the time profile control and deep flooding fluid being turned to difunctional explosion type pre-crosslinked gel particle inject oil reservoir, its concrete operations can be carried out according to the conventional injection mode of this area, and preferably, the method for above-mentioned raising oil recovery rate comprises the following steps:
(injected water is according to site operation equipment situation in the injection device of ground, to use injected water, adopt return water or clear water) turn to difunctional explosion type pre-crosslinked gel particle to be mixed with stabilizing solution profile control and deep flooding fluid, solution concentration is according to the make out the scale of down-hole macropore and high permeability zone, preferably, the mass percentage content of particle is 0.1%-0.6%.Then stabilizing solution is injected to high watercut layer.Pre-crosslinked gel particle enters after high watercut layer, first the macropore of shutoff near wellbore zone and superelevation permeable formation, force injected water preferentially to enter less permeable layer residual oil district and start residual oil, the grade pre-crosslinked gel particle of shutoff near wellbore zone under the effect of formation temperature through setting control time after explosion become micron order and submicron order granule, enter oil deposit deep part, play the effect that deep flooding fluid turns to.
The method that the invention provides raising oil recovery rate turns to difunctional explosion type pre-crosslinked gel particle to turn to for profile control and the deep flooding fluid of high water cut oil field profile control and deep flooding fluid, mode under Injection Well and foundation can be carried out in a conventional manner, are specifically related to following formula and step:
1, theoretical calculating:
1) place the degree of depth
Place the degree of depth and refer to the distance of gel flowing front apart from Injection Well.Design formulas is suc as formula (1):
Wherein:
In formula:
R
afor treatment radius, unit is m;
R
efor the water filling radius of influence, unit is m;
R
wfor wellbore radius, unit is m;
F
gfor the ratio of water injection capacity before and after processing;
Q
1, q
2be respectively before processing, daily water-injection rate after treatment, unit is m
3/ d;
Δ p
po, Δ p
posfor process before, difference between reservoir pre ssure and injection pressure after treatment, unit is MPa;
F
rrfor residual resistance factor (test and determine by laboratory core);
2) injection rate (quality of dry pre-crosslinked gel particle):
In formula:
V is injection rate, and unit is m
3/ d;
H
ifor i layer (layer refers to the thickness of oil-bearing layer, is to obtain by logging data interpretation) thickness, unit is m;
for the degree of porosity of i layer;
R
ifor the treatment radius of i layer, unit is m;
N is the number of plies.
2, the concrete mode under pre-crosslinked gel particle Injection Well can be comprised the following steps:
(1) survey construction well intake profile, falloff curve;
(2) check well head, dispensing well is tested envelope;
(3) bring up to construction equipment, and commissioning test;
(4) ground pressure testing, stratum injection test;
(5) inject gel particle: injection rate is determined according to reservoir geology situation, injecting flow determines according to formation fracture pressure, calculate the not injection flow higher than formation fracture pressure according to the viscometer of shaft bottom in-place permeability and injection liquid, according to oil reservoir voids volume, permeability, the calculation of parameter such as saturation ratio go out to need solution (stabilizing solution that injected water and the difunctional pre-crosslinked gel particle of the present invention are mixed with) volume injecting, use skid-mounted type injection pump to implement to inject operation, in injection process, dynamically adjust flow velocity, when making injection pressure be no more than formation fracture pressure, do not exceed water injection pressure 2MPa,
(6) the normal water filling of becoming a full member; Water injection pressure basis first water injection pressure is adjusted, and injects range of flow 10 side/skies to 100 side/skies;
(7) remove construction equipment, recover well site environment;
(8), after water filling 10-15 days, survey intake profile, falloff curve;
(9) reach after blasting time, survey intake profile, falloff curve.
In said process, survey the operations such as intake profile, survey falloff curve, ground pressure testing, stratum injection test and all can carry out according to this area usual manner.
In oil reservoir mining operations, provided by the invention while utilizing profile control and deep flooding fluid to turn to pre-crosslinked gel particle to improve the method for oil recovery rate when adopting, can realize the double effects that profile control and deep flooding fluid turn to, can control the blasting time of pre-crosslinked gel particle by the concentration of adjusting labile cross linker and astable crosslinking agent simultaneously, thereby reach the object of controlling duty cycle.In the practice of construction of prior art, conventionally need to be before injection profile agent, strong washing layer is carried out to anti-channeling operation, turn to the efficiency of operation to improve follow-up deep flooding fluid, and pre-crosslinked gel particle provided by the present invention combines the function that profile control and deep flooding fluid turn to, can simplify complicated profile control and deep flooding fluid and turn to operation, cost-saving.
Brief description of the drawings
The following drawings is only intended to the present invention to schematically illustrate and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the action principle schematic diagram of pre-crosslinked gel particle of the present invention in oil reservoir;
Fig. 2 is the mechanism schematic diagram of expansion and the decomposition of pre-crosslinked gel particle of the present invention;
Fig. 3 is the schematic diagram of the three-dimensional oil reservoir physical model in embodiment 4;
Fig. 4 is the pressure history in oil displacement process;
Fig. 5 is the recovery ratio change curve in oil displacement process.
Detailed description of the invention
Understand for technical characterictic of the present invention, object and beneficial effect being had more clearly, referring now to Figure of description, technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
Embodiment 1
The pre-crosslinked gel particle that the present embodiment provides a kind of profile control and deep flooding fluid to turn to use, has following raw material composition:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable crosslinking agent and monomer is 1: 300.
The profile control that the present embodiment provides and deep flooding fluid turn to the pre-crosslinked gel particle of use to prepare according to following steps:
30 grams of acrylamides are added in 100 grams of distilled water and fully dissolved, obtain acrylamide solution, i.e. monomer the first solution;
1g methene base bisacrylamide is added in 100 grams of distilled water and fully dissolved, obtain methene base bisacrylamide solution, i.e. labile cross linker solution;
1g methene base bisacrylamide solution is added in acrylamide solution, obtain the first mixed solution;
Purify 15 minutes to nitrogen injection in the first mixed solution;
In the first mixed solution purifying to process, adding 0.1g concentration is the ammonium persulfate solution of 1000ppm, then solution is put into 60 DEG C of insulating box insulation reaction 5 hours, obtains body gel;
Take out the body gel of plastic, the stable cross-linked gel piece being cut into small pieces, and drying for standby;
After 0.1 gram of polypropylene glycol diacrylate and 30 grams of acrylamides are added and fully dissolved in 69.9 grams of distilled water, obtain adding monomer second solution of astable crosslinking agent;
Purify 15 minutes to nitrogen injection in monomer the second solution;
To add 0.1g concentration in monomer the second solution after purifying be the ammonium persulfate solution of 1000ppm and fully stir, obtain the second mixed solution;
Dry stable cross-linked gel particle is ground to form to micron particles, put into the second mixed solution and fully soak and leave standstill 24 hours;
Containing the second mixed solution of stablize cross-linked gel particle after leaving standstill is put into 60 DEG C of insulating box insulation reaction 24 hours, obtain body gel, drying and grinding obtains profile control and deep flooding fluid afterwards and turns to the pre-crosslinked gel particle of use.
Hydrolysis test
Testing procedure: profile control prepared by embodiment 1 and deep flooding fluid turn to pre-crosslinked gel particle and be dissolved in the NaCl solution that concentration is 1wt% and obtain mixed solution, observe the hydrolysis situation of gel particle, wherein, in mixed solution, the concentration of gel particle is 2000ppm, and the temperature of mixed solution is respectively 80 DEG C, 60 DEG C, 45 DEG C;
Test result: when the temperature of mixed solution is 80 DEG C, pre-crosslinked gel particle is hydrolyzed into micron particles solution needs 12 days, and the micron particles solution viscosity obtaining after hydrolysis is 170cp; In the time that the temperature of mixed solution is 60 DEG C, pre-crosslinked gel particle complete hydrolysis needs 80 days, and the micron particles solution viscosity obtaining after hydrolysis is 290cp; In the time that the temperature of mixed solution is 45 DEG C, after half a year, pre-crosslinked gel particle does not yet have complete hydrolysis; Wherein, when the temperature of mixed solution is 80 DEG C, 60 DEG C, the difference of the micron particles solution viscosity obtaining is because the main chain of polymer molecule unstable fracture at high temperature caused.By above-mentioned test specification, the pre-crosslinked gel particle that the present embodiment provides has good hydrolysis property, can adapt to the requirement of oil well depth profile control operation, and its blasting time can be controlled, thereby controls duty cycle.
Seepage flow test
Thering are three pressure sensors, length is that 52cm, diameter are 5cm
2back-up sand rock core model on carry out the Seepage Experiment of the gel particle that embodiment 1 provides.
Experimental procedure: 40 order quartz sands are inserted in sandpipe model, and compacting, vacuumizes 8 hours, saturation simulation formation water, record cast voids volume; Injected water, measures injection pressure and calculates water phase permeability; Then the pre-crosslinked gel particle solution that compound concentration is 0.2wt%, and leave standstill 15 days at 80 DEG C, after complete hydrolysis, inject sandpipe model (0.1 times that injection rate (volume) be total pore size volume), record the variation of the pressure along 3 pressure taps of journey in injection process.After gel solution has injected, continue water filling (1 times that injection rate is total pore size volume), record the pressure along the each pressure tap of journey in the injecting process and change.According to the resistance coefficient of each section of the pressure change calculations sandpack column of each point in gel injection process, according to the residual resistance factor of each section of the pressure change calculations model of each point in rear water drive process.
Experimental result (as shown in table 1) shows: the resistance coefficient of gel particle and residual resistance factor have all reached designing requirement.
Table 1 one-dimensional model Seepage Experiment result
Embodiment 2
The pre-crosslinked gel particle that the present embodiment provides a kind of profile control and deep flooding fluid to turn to use, has following raw material composition:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable crosslinking agent and monomer is 1: 300.
The profile control that the present embodiment provides and deep flooding fluid turn to the preparation process of the pre-crosslinked gel particle of use can reference example 1, and except the consumption of raw material and additive, other are all identical.
Embodiment 3
The pre-crosslinked gel particle that the present embodiment provides a kind of profile control and deep flooding fluid to turn to use, has following raw material composition:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable crosslinking agent and monomer is 1: 300.
The profile control that the present embodiment provides and deep flooding fluid turn to the preparation process of the pre-crosslinked gel particle of use can reference example 1, and except the consumption of raw material and additive, other are all identical.
Embodiment 4
1, model
Set up three-dimensional non-homogeneous model according to the geologic information of oil field region, model volume 500mm × 500mm × 150mm, in model, arrange 30 differential pressure pickups and 31 saturation ratio measuring probes, 30 differential pressure pick-ups, divide three layers of distribution of upper, middle and lower, every layer of 10 differential pressure pick-up that distributes, three layers of differential pressure pick-up are respectively 2.5mm, 7.5mm, 12.5mm apart from the distance of model bottom; The copper pipe that a longitudinal failure model is arranged respectively at two diagonal angles of model is as Injection Well and producing well, the long 10cm of well, and 4 of perforations on the cross section that perforation density is every 1cm, the angle 90 between two holes is spent, bag gauze.Fig. 3 is shown in by the schematic diagram of above-mentioned three-dimensional oil reservoir physical model.
2, displacement of reservoir oil step:
In model, inject formation water and make it saturated, the water phase permeability of measurement model and voids volume in this process;
Inject crude oil and make it saturated to model, recording saturated former oil mass, saturated former oil mass is 7652mL altogether;
Carry out water drive until moisture content reaches 95%, the salinity of the injected water that water drive is used is 5000ppm, and injection rate is 0.5mL/min;
After water drive completes, inject with the speed of 0.5mL/min the pre-crosslinked gel particle that the embodiment 1 of 0.1PV provides;
After the pre-crosslinked gel particle that injection embodiment 1 provides, then continue water drive 1PV, then closing well, heats to 80 DEG C, keeps 3 months, then drives a well, and water drive to moisture content is 95%.
The basic physical-property parameter of model is in table 2, and dispersion gel particle injection parameter is in table 3.
Table 2 three-dimensional physical model physical-property parameter
Table 3 injection parameter
| Type | Composition | Inject volume | Injection rate |
| I type dispersion gel granular system | Body gel before explosion | 0.05PV | 0.1mL/min |
3, interpretation of result
Pressure stability in the time of water drive is for the first time in 10KPa left and right, and while injecting gel particle, pressure rises to rapidly 1.5MPa, and while again carrying out water drive, pressure drop is to 1MPa; In continuation water drive process after closing well keeps 80 DEG C to drive a well again, injection pressure drops to 600KPa and keeps stable, and Fig. 4 is the pressure history in oil displacement process.After injecting gel particle, oil recovery factor has improved 3%, under reservoir temperature, keeps after 3 months, recovers water drive, improves recovery ratio 6%, always improves recovery ratio 9%.Fig. 5 is the recovery ratio change curve in oil displacement process.
Claims (10)
1. one kind is improved the method for oil recovery rate, it is that a kind of profile control and deep flooding fluid of adopting turns to difunctional explosion type pre-crosslinked gel particle to improve the method for oil recovery rate, wherein, to turn to difunctional explosion type pre-crosslinked gel particle be to be caused and the body gel drying that obtains of polymerization crosslinking occurs grind the gel particle forming through initator by monomer, labile cross linker and astable crosslinking agent for described profile control and deep flooding fluid; Wherein, described monomer is acrylamide; Or described monomer is acrylamide and acrylic acid mixture; Or described monomer is the mixture of acrylamide and acrylic acid and other monomer; Or described monomer is the mixture of acrylamide and other monomer;
Described profile control and deep flooding fluid turn to difunctional explosion type pre-crosslinked gel particle to prepare according to following steps:
(1) acrylamide is added in distilled water and fully dissolve, obtaining mass percent is monomer the first solution of 10%-50%, in the time adopting acrylic acid and other monomer, adds in the lump;
(2) taking distilled water as solvent, preparation obtains the labile cross linker solution of concentration as 0.01%-0.1%;
(3) labile cross linker solution is added in monomer the first solution, obtain the first mixed solution;
(4) purify 15-60 minute to nitrogen injection in the first mixed solution;
(5), to adding initator through in the first mixed solution of nitrogen purge, after stirring, the insulating box of putting into 45-80 ° of C is incubated 5-12 hour, obtains the gel piece of plastic;
(6) gel piece be cut into small pieces and be dried, obtaining stablizing cross-linked gel piece;
(7) acrylamide is added in distilled water and fully dissolve, obtaining mass percent is monomer the second solution of 10%-50%, in the time adopting acrylic acid and other monomer, adds in the lump;
(8) the astable cross-linking agent solution taking distilled water as solvent compound concentration as 0.1%-1%;
(9) astable cross-linking agent solution is added in monomer the second solution, stir 2-4 hour until solution is completely even;
(10) purify 15-60 minute to nitrogen injection in solution;
(11) in solution, add the initator of 0.1g, and stir 2-4 hour until completely even, form the second mixed solution;
(12) the stable cross-linked gel piece of drying is ground to form to particle, obtain stablizing cross-linked gel particle;
(13) will stablize cross-linked gel particle and put into the second mixed solution of step (11), leave standstill 24 hours;
(14) insulating box that mixed solution step (13) being formed is put into 60 ° of C is incubated 24 hours, obtains body gel, and drying and grinding obtains described profile control afterwards and deep flooding fluid turns to difunctional explosion type pre-crosslinked gel particle.
2. method according to claim 1, wherein, described other monomer comprises one or more in 2-acrylamide-2-methylpro panesulfonic acid sodium salt, methacrylic acid, maleic acid, 2-acrylic acid, sulfopropyl acrylic acid, dimethylaminoethylacmethyl methyl chloride and dimethyl diallyl ammonium chloride.
3. method according to claim 1, wherein, described labile cross linker comprises one or more in 2-acrylamide-2-methylpro panesulfonic acid sodium salt, divinyl acid esters, GDMA, acrylic acid trimethyl propane trimethyl ester and methene base bisacrylamide.
4. method according to claim 3, wherein, the mass ratio of described labile cross linker and described monomer is 1:200-8000, described monomer refers to the monomer with described labile cross linker generation polymerization crosslinking.
5. method according to claim 1, wherein, described astable crosslinking agent comprises one or more in polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, polyethylene glycol, polypropylene glycol diacrylate, glycol diacrylate, three methanol-based propane three acrylic acid fat, ethyoxyl tri methylol triacrylate, ethyoxyl tetramethylol methane tetraacrylate and their derivative.
6. method according to claim 5, wherein, the mass ratio of described astable crosslinking agent and described monomer is 1:300-3000, described monomer refers to the monomer with described astable crosslinking agent generation polymerization crosslinking.
7. method according to claim 1, wherein, described initator is one or more in potassium sulfate, ammonium persulfate and tetramethylethylenediamine.
8. method according to claim 7, wherein, in twice polymerization crosslinking process, each time when polymerization crosslinking described in the mass ratio of initator and described monomer be 1:300-5000.
9. method according to claim 1, wherein, it is 100-120 order that described profile control and deep flooding fluid turn to the particle diameter of difunctional explosion type pre-crosslinked gel particle.
10. method according to claim 1, wherein, the method comprises the following steps:
In the injection device of ground, use injected water to turn to difunctional explosion type pre-crosslinked gel particle to be mixed with stabilizing solution described profile control and deep flooding fluid, then stabilizing solution is injected to high watercut layer, wherein, in stabilizing solution, it is 0.1%-0.6% that described profile control and deep flooding fluid turn to the mass percentage content of difunctional explosion type pre-crosslinked gel particle.
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| CN103982169B (en) * | 2014-04-29 | 2016-08-31 | 惠建龙 | Sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid |
| CN104119472B (en) * | 2014-06-30 | 2017-01-11 | 大庆高新区华龙祥化工有限公司 | Active pre-crosslinking gel particle |
| CN104712297B (en) * | 2015-01-12 | 2016-06-08 | 中国石油大学(华东) | A kind of screening technique of noting poly-bad effect well and altering poly-well |
| CN105368422A (en) * | 2015-12-09 | 2016-03-02 | 天津大港油田滨港集团博弘石油化工有限公司 | Pre-crosslinking swell particle profile-control agent and preparation method thereof |
| FR3061909B1 (en) * | 2017-01-19 | 2019-05-24 | S.P.C.M. Sa | PROCESS FOR ASSISTED OIL RECOVERY BY INJECTION OF A POLYMERIC AQUEOUS COMPOSITION CONTAINING MICROGELS |
| CN108661612A (en) * | 2017-03-27 | 2018-10-16 | 中国石油化工股份有限公司 | A kind of method that high salinity reservoirs water drive improves recovery ratio |
| CN110457857B (en) * | 2019-08-21 | 2022-11-15 | 中国海洋石油集团有限公司 | Method for predicting polymer flooding effect under different crude oil viscosity conditions |
| CN112228002B (en) * | 2020-09-09 | 2022-11-15 | 大庆康盛石油节能科技开发有限公司 | Plugging device for near wellbore zone of perforated oil layer |
| CN116179174A (en) * | 2023-02-13 | 2023-05-30 | 中国石油化工股份有限公司 | Profile control agent for blocking polymer channeling in medium and high permeability reservoir and blocking method |
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