CN102504795B - Dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion - Google Patents
Dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion Download PDFInfo
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Abstract
The invention relates to a dual-function explosive pre-crosslinking gel particle for profile control and deep fluid flow diversion. The pre-crosslinking gel particle for the profile control and the deep fluid flow diversion provided in the invention is a gel particle obtained by polymerizing and crosslinking a monomer, a stable crosslinking agent and an unstable crosslinking agent by an initiator to obtain a body gel, drying the gel and grinding the gel. The gel particle has a core-shell structure, wherein the stable crosslinking agent is polymerized and crosslinked with parts of the monomer to form the stable crosslinking core, and the unstable crosslinking agent is polymerized and crosslinked with parts of the monomer at the outside of the stable crosslinking gel core to form the unstable crosslinking gel coating shell. When the gel particle provided in the invention is applied to the oil reservoir exploitation, the dual effect of the profile control and the deep fluid flow diversion can be realized, and concentrations of the stable crosslinking agent and the unstable crosslinking agent can be adjusted to control the explosion time of the pre-crosslinking gel particle, so a purpose for controlling the working period can be reached.
Description
Technical field
The present invention relates to the gel particle adopted in a kind of water-blocking operation of oil production, relate in particular to a kind of profile control and deep flooding fluid and turn to difunctional explosion type pre-crosslinked gel particle, 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 cementing matter 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, and the 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 vertically; Underground viscosity of crude is high, and oilwater viscosity ratio 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 are the problems such as displacement of reservoir oil cost is high, the field conduct difficulty is large; For serious heterogeneity, have the oil reservoir of high permeable strip or " macropore ", still exist the part well to alter poly-serious problem, affected and annotated poly-effect, and due to the limitation of polymkeric substance itself, make its virtual viscosity loss in the stratum of high temperature, high salinity very large, often do not reach the expection purpose.The ternary composite driving technology also is widely used gradually at maturing fields such as grand celebrations, ternary composite driving utilizes the effect of decreasing by surfactant interfacial tension to make the capillary force decrease, profit reaches mixed phase and flows, thereby the irreducible oil in the startup low-permeability oil deposit, but there are 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 the 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 amendment, at first amendment can macropore plugging and most permeable zone, forces injected water to enter hyposmosis irreducible oil district, secondly along with the expansion of Profile Modification Depth, can make injected water enter the deep residual oil area, start more surplus oil.Amendment commonly used has two classes, the one, gel-like, the 2nd, particulate species at present.
The gel-like amendment comprises body gel, weak gel and colloidal dispersed gel.The function of body gel is mainly the high strength water breakthrough passage of shutoff immediate vicinity of wellbore, because form is semi-solid state, therefore can't go deep into stratum, is applicable to crack, immediate vicinity of wellbore and most permeable zone shutoff; Weak gel be take intramolecular crosslinking as main, and intermolecular cross-linking is auxiliary, forms the weak three-dimensional net structure of crosslinking degree, characteristics with dehydration of body gel, have certain integrity, 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 gelling system of the non-three-dimensional net structure of the polymkeric substance of lower concentration and linking agent formation, because the concentration of polymkeric substance and linking agent is low, the intermolecular chance bumped is few, the tridimensional network of unlikely formation intermolecular cross-linking, the main colloidal particle consisted of the polymer coils of intramolecular crosslinking is dispersed in water medium, forms the thermodynamic stable system with gel attribute and colloidal property, and this system does not have globality, there is no shape, can flow.The characteristics of colloidal dispersed gel are: 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 ℃, clear water preparation, bad adaptability.
The particulate species gel comprises polymer microballoon, volume expansion grain, flexible particle and microcapsule etc., and it adopts the method for precrosslink to have good heat-resistant salt-resistant, shear-stable ability.The rate of expansion of polymer microballoon is subject to the impact of formation water salinity, and the median size of the microballoon after expansion is tens nanometers, shut-off capacity a little less than; Volume expansion grain can carry out the particle diameter adjustment according to different reservoir conditions, and expansion multiple is affected by formation water salinity, makes intensity influenced less, because the volume expansion grain particle diameter is larger, so deep flooding fluid turn to limited in one's ability.Flexible particle can be migrated in duct, distortion is passed through, produce temporarily stifled dynamic resistance, pulsation phenomenon is arranged, can realize that 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 be regulated 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 the current high strength is washed away crack and the superelevation pervious course caused, must use the high strength blocking agent to carry out the anti-channeling operation, can not be brought into play to greatest extent otherwise the compliance steer agent improves the effect of recovery ratio.
In sum, up to the present, in the water plugging and profiling technology of oil production, 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 pre-crosslinked gel particle, this pre-crosslinked gel particle is that a kind of profile control and deep flooding fluid turn difunctional explosion type pre-crosslinked gel particle, is particularly suitable for improving the recovery ratio in the oil field of high water-cut stage.
For achieving the above object, the pre-crosslinked gel particle that at first the present invention provides a kind of profile control and deep flooding fluid to turn to use, it is to be caused the gel particle that the grinding of the resulting body gel of polymerization crosslinking drying forms occurs through initiator by monomer, labile cross linker and astable linking agent.This gel particle has nucleocapsid structure, wherein, described labile cross linker and partial monosomy form the kernel with stable glue connection after polymerization and glue connection, and described astable linking agent and partial monosomy form the gel coat shell with astable glue connection at the outside polymeric gel connection of stable gel kernel.
In above-mentioned pre-crosslinked gel particle provided by the invention, preferably, the body gel is at first to use labile cross linker and monomer to carry out precrosslink under the initiation of initiator to form stable cross-linked particles, then uses astable linking agent again to be cross-linked to form astable glue connection coated shell in formed stable cross-linked particles outside under the initiation of initiator and the body gel that obtains.The addition of adjusting astable linking agent can make the precrosslink microparticle under specific reservoir temperature, at the appointed time implosion is broken into microparticle, therefore for different reservoir medias, adopt the astable linking agent of different concns, can make the hydrolysis time of pre-crosslinked gel particle and temperature be hydrolyzed in corresponding oil reservoir in good time.
The kernel (core core) of the pre-glue connection gel particle of provided by the present invention pair of glue connection structure joins gel particle for the pre-glue that the stable glue of having of micron and submicron order connects structure, externally form after secondary glue connection and have the gel coat shell that astable glue connects structure, the particle diameter of gel shell can reach a millimeter rank.The pre-glue connection gel particle of this geminus can synchronously be realized two kinds of profile control mechanism, the i.e. superelevation pervious course in the shutoff oil reservoir at first, then under the reservoir temperature effect, explosion forms the micron-sized gel particle with stable glue connection, enters oil deposit deep part, synchronously realizes two kinds of profile control mechanism.
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, after pre-crosslinked gel particle injects oil reservoir, the pre-crosslinked gel particle expanded is at first macropore plugging and superelevation pervious course in the oil reservoir immediate vicinity of wellbore, make injected water enter the low-permeability layer district and start irreducible oil, the pre-crosslinked gel particle of expansion keeps shape can under the reservoir temperature effect, be decomposed into micron order gel particle and nano level gel particle after for some time.This generated in-situ micron order and nano level gel particle can continue to move into oil deposit deep part, and due to be under the oil reservoir environment and specify blasting time (blasting time is controlled and can reach by adjusting gel component) after, gel particle just can be degraded into micron order and nano level gel particle, the mechanism schematic diagram of the expansion that Fig. 2 is pre-crosslinked gel particle of the present invention and decomposition.As can be seen from Figure 2, gel particle expands in local water solution, under certain formation temperature and pH value condition, and astable crosslinked fracture, particle deformation becomes micron order and nano level 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 immediate vicinity of wellbore most permeable zone shutoff and oil deposit deep part fluid diversion.
The monomer that pre-crosslinked gel particle adopts is preferably acrylamide, the perhaps mixture of acrylamide and vinylformic acid and/or other monomer, wherein, when adopting acrylamide to mix mutually with vinylformic acid, the mass ratio of the two may be controlled to 9: 1, when adopting other monomer, its addition is identical with vinylformic acid.In above-mentioned composition, take acrylamide as main, a certain proportion of vinylformic acid that simultaneously can add as required and/or other monomer can with acrylamide generation copolyreaction, can make gel keep within a certain period of time temperature, do not degrade, keep integrity, can avoid so crosslinked because adopt astable linking agent to carry out, astable linking agent is in the situation that the problem that calcium carbonate exists (being under reservoir media) to degrade or to decompose.
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-vinylformic acid (2-Propenoic acid), sulfopropyl vinylformic 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, Ethylene glycol dimethacrylate, vinylformic acid trimethyl propane trimethylammonium ester and methene base bisacrylamide etc.
According to concrete technical scheme of the present invention, preferably, the astable linking agent that pre-crosslinked gel particle adopts comprises polyethyleneglycol diacrylate (polyethylene glycol diacrylate), polyethylene glycol dimethacrylate (polyethylene glycol dimethacrylat), polyoxyethylene glycol, polypropylene glycol diacrylate (polypropylene glycol diacrylate), glycol diacrylate (ethylene glycol diacrylate), three methanol-based propane three acrylic acid fat (trimethylopropane trimethacrylate), oxyethyl group tri methylol triacrylate (ethoxylated trimethylol triacrylate), one or more in oxyethyl group tetramethylol methane tetraacrylate (ethoxylated pentaerythritol tetracrylate) and their derivative etc.
According to concrete technical scheme of the present invention, the initiator that pre-crosslinked gel particle adopts is preferably vitriolate of tartar (K
2S
2O
8), one or more in ammonium persulphate and Tetramethyl Ethylene Diamine (TMTDA) etc., more preferably ammonium persulphate.Above-mentioned initiator is used for monomer A M is inspired to polyreaction, is all normal starter, and the concentration of initiator can be also conventional amount used.In twice polymerization crosslinking process, the mass ratio of described initiator and described monomer all may be controlled to 1 during polymerization crosslinking each time: 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 linking agent and monomer is 1: 300-3000, this monomer refers to the monomer with this astable linking agent generation polymerization crosslinking.
According to concrete technical scheme of the present invention, preferably, in pre-crosslinked gel particle, the mass ratio of initiator 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 the 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.
The present invention also provides above-mentioned profile control and deep flooding fluid to turn to the preparation method of the pre-crosslinked gel particle of use, and it comprises the following steps:
(1) acrylamide (when adopting vinylformic acid and other monomer, can add in the lump) is added in distilled water and fully dissolves, monomer the first solution that to obtain mass percent be 10%-50%;
(2) take distilled water obtains the labile cross linker solution that concentration is 0.01%-0.1% as solvent preparation;
(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 mixing solutions;
(4) purify 15-60 minute to nitrogen injection in the first mixing solutions;
(5) to through in the first mixing solutions of nitrogen purge, adding initiator, after stirring, put into the thermostat container insulation 5-12 hour of 45-80 ℃, obtain the gel piece of plastic;
(6) gel piece is cut into small pieces and dry, obtains stablizing the cross linked gel piece;
(7) acrylamide (when adopting vinylformic acid and other monomer, can add in the lump) is added in distilled water and fully dissolves, monomer the second solution that to obtain mass percent be 10%-50%;
(8) take the astable cross-linking agent solution that distilled water is 0.1%-1% as the solvent compound concentration;
(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 linking agent, astable linking 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 fully even;
(10) purify 15-60 minute to nitrogen injection in solution;
(11) add the initiator of 0.1g in solution, and stir 2-4 hour until fully evenly, form the second mixing solutions;
(12) the stable cross linked gel piece of drying is ground to form to particle, obtain stablizing the cross linked gel particle;
(13) will stablize the second mixing solutions that the cross linked gel particle is put into step (11), standing 24 hours;
(14) mixing solutions step (13) formed is put into the thermostat container insulation 24 hours of 60 ℃, obtains the body gel, obtains profile control after drying and grinding and deep flooding fluid turns to difunctional explosion type pre-crosslinked gel particle.
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 the body gel carry out drying under 60 ℃, dry body gel after purification grinds to form small-particle, obtain dry gel particle after sieve series, then this dry gel particle adds in astable cross linked gel solution and carries out secondary crosslinking, the crosslinked outside stablizing cross-linked particles of astable gel that secondary crosslinking forms, thereby obtain the body gel.
The present invention also provides a kind of flooding method, and it is the method that adopts above-mentioned profile control and deep flooding fluid to turn to the pre-crosslinked gel particle of use to carry out displacement of reservoir oil operation, comprises the following steps:
(injected water is according to site operation equipment situation to use injected water in the injection device of ground, 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, strength of solution is determined according to the oil reservoir situation, then stabilizing solution is injected to high watercut layer, wherein, in stabilizing solution, profile control and deep flooding fluid turn to the make out the scale of difunctional explosion type pre-crosslinked gel particle concentration according to down-hole macropore and most permeable zone, preferably, the mass percentage content of particle is 0.1%-0.6%.After pre-crosslinked gel particle enters high watercut layer, at first the macropore of shutoff immediate vicinity of wellbore and superelevation pervious course, force injected water preferentially to enter low permeability layer irreducible oil district and start irreducible oil, the grade pre-crosslinked gel particle of shutoff immediate vicinity of wellbore under the effect of formation temperature after the period of setting explosion become micron order and nano level small-particle, enter oil deposit deep part, play the effect that deep flooding fluid turns to.
Profile control provided by the invention and deep flooding fluid turn to the pre-crosslinked gel particle of use when exploiting for oil reservoir, 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 linking agent simultaneously, thereby reach the purpose of controlling working cycle.
In the practice of construction of prior art, usually need to be before the injection profile agent, strong washing layer is carried out to the 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 of anti-channeling and polymer flooding, can simplify complicated profile control and deep flooding fluid and turn to operation, cost-saving.
The accompanying drawing explanation
The following drawings only is intended to the present invention is done and schematically illustrates 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;
The mechanism schematic diagram of the expansion that Fig. 2 is pre-crosslinked gel particle of the present invention and decomposition;
The schematic diagram that Fig. 3 is 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.
Embodiment
Understand for technical characterictic of the present invention, purpose 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 but can not be interpreted as the restriction to practical range of the present invention.
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 and forms:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable linking 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 gram acrylamides are added in 100 gram distilled water and fully dissolve, obtain acrylamide soln, i.e. monomer the first solution;
1g methene base bisacrylamide is added in 100 gram distilled water and fully dissolves, obtain methene base bisacrylamide solution, i.e. labile cross linker solution;
1g methene base bisacrylamide solution is added in acrylamide soln, obtain the first mixing solutions;
Purify 15 minutes to nitrogen injection in the first mixing solutions;
Add the ammonium persulfate solution that 0.1g concentration is 1000ppm in the first mixing solutions through purifying, then solution is put into to 60 ℃ of thermostat container insulation reaction 5 hours, obtain the body gel;
Take out the body gel of plastic, the stable cross linked gel piece be cut into small pieces, and drying for standby;
After 0.1 gram polypropylene glycol diacrylate and 30 gram acrylamides are added in 69.9 gram distilled water and fully dissolve, obtained adding monomer second solution of astable linking agent;
Purify 15 minutes to nitrogen injection in monomer the second solution;
Add the ammonium persulfate solution that 0.1g concentration is 1000ppm and fully stir in monomer the second solution after purifying, obtaining the second mixing solutions;
The stable cross linked gel particle of drying is ground to form to micron particles, put into the second mixing solutions and fully soak standing 24 hours;
The second mixing solutions of stablizing the cross linked gel particle that contains after standing is put into to 60 ℃ of thermostat container insulation reaction 24 hours, obtain the body gel, obtain the pre-crosslinked gel particle that profile control and deep flooding fluid turn to use after drying and grinding.
The hydrolysis test
Test procedure: the pre-crosslinked gel particle that profile control prepared by embodiment 1 and deep flooding fluid turn to use is dissolved in the NaCl solution that concentration is 1wt% and obtains mixing solutions, observe the hydrolysis situation of gel particle, wherein, in mixing solutions, the concentration of gel particle is 2000ppm, and the temperature of mixing solutions is respectively 80 ℃, 60 ℃, 45 ℃;
Test result: when the temperature of mixing solutions is 80 ℃, pre-crosslinked gel particle is hydrolyzed into micron particles solution needs 12 days, and the micron particles soltion viscosity obtained after hydrolysis is 170cp; When the temperature of mixing solutions is 60 ℃, the pre-crosslinked gel particle complete hydrolysis needs 80 days, and the micron particles soltion viscosity obtained after hydrolysis is 290cp; When the temperature of mixing solutions is 45 ℃, after half a year, pre-crosslinked gel particle does not yet have complete hydrolysis; Wherein, when the temperature of mixing solutions is 80 ℃, 60 ℃, the difference of resulting micron particles soltion viscosity is because main chain unstable fracture the at high temperature of polymer molecule 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 working cycle.
The seepage flow test
Thering are three pressure transmitters, 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 the sandpipe model, and compacting, vacuumize 8 hours, saturation simulation local water, record cast volume of voids; Injected water, measure injection pressure and calculate water phase permeability; Then the pre-crosslinked gel particle solution that compound concentration is 0.2wt%, and standing 15 days at 80 ℃, after complete hydrolysis, inject sandpipe model (0.1 times that injection rate (volume) is total pore size volume), record the pressure change along 3 pressure taps of journey in injection process.After gelating soln has injected, continue water filling (1 times that injection rate is total pore size volume), record in the injecting process the pressure change along each pressure tap of journey.Calculate the resistance coefficient of each section of sand-packed model according to the pressure change of each point in the gel injection process, according to the residual resistance factor of each section of pressure change computation 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 design requirements.
Table 1 one-dimensional model Seepage Experiment result
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 and forms:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable linking 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.
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 and forms:
Wherein, the ratio of labile cross linker and monomer is 1: 3000, and the ratio of astable linking 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.
1, model
Set up three-dimensional non-homogeneous model according to the geologic information of oil field region, model volume 500mm * 500mm * 150mm, arrange 30 differential pressure pickups and 31 saturation ratio measuring probes in model, 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 is respectively 2.5mm, 7.5mm, 12.5mm apart from the distance of model bottom; The copper pipe that a vertical failure model is arranged respectively at two diagonal angles of model is as Injection Well and recovery well, the long 10cm of well, and on the cross section that perforation density is every 1cm, perforation is 4, angle 90 degree between two holes, 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:
Inject local water and make it saturated, the water phase permeability of measurement model and volume of voids in this process in model;
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 water ratio reaches 95%, the salinity of the injected water that water drive is used is 5000ppm, and injection speed is 0.5mL/min;
After water drive completes, with the speed of 0.5mL/min, inject 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, heat to 80 ℃, keeps 3 months, then drives a well, and water drive to water ratio 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 | Form | Inject volume | Injection speed |
| I type dispersion gel granular system | Body gel before explosion | 0.05PV | 0.1mL/min |
3, interpretation of result
Pressure-stabilisation when water drive for the first time is in the 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 ℃ 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, recovering water drive, improves recovery ratio 6%, always improves recovery ratio 9%.Fig. 5 is the recovery ratio change curve in oil displacement process.
Claims (8)
1. a profile control and deep flooding fluid turn to the pre-crosslinked gel particle of use, it is caused the gel particle that the grinding of the resulting body gel of polymerization crosslinking drying forms occurs through initiator by monomer, labile cross linker and astable linking agent, this gel particle has nucleocapsid structure, wherein, described labile cross linker and partial monosomy form the kernel with stable glue connection after polymerization and glue connection, and described astable linking agent and partial monosomy form the gel coat shell with astable glue connection at the outside polymeric gel connection of the gel kernel of stablizing the glue connection;
The mixture that described monomer is acrylamide or acrylamide and vinylformic acid and/or other monomer, described other monomer comprises one or more in 2-acrylamide-2-methylpro panesulfonic acid sodium salt, methacrylic acid, maleic acid, 2-vinylformic acid, sulfopropyl vinylformic acid, dimethylaminoethylacmethyl methyl chloride and dimethyl diallyl ammonium chloride;
Described labile cross linker comprises one or more in 2-acrylamide-2-methylpro panesulfonic acid sodium salt, divinyl acid esters, Ethylene glycol dimethacrylate, vinylformic acid trimethyl propane trimethylammonium ester and methene base bisacrylamide;
Described astable linking agent comprises one or more in polyethyleneglycol diacrylate, polyethylene glycol dimethacrylate, polyoxyethylene glycol, polypropylene glycol diacrylate, glycol diacrylate, three methanol-based propane three CALCIUM ACRYLATE, oxyethyl group tri methylol triacrylate, oxyethyl group tetramethylol methane tetraacrylate.
2. pre-crosslinked gel particle according to claim 1, wherein, described body gel is at first to use labile cross linker and monomer to carry out precrosslink under the initiation of initiator to form stable cross-linked particles, then uses astable linking agent again to be cross-linked to form astable glue connection coated shell in formed stable cross-linked particles outside under the initiation of initiator and the body gel that obtains.
3. pre-crosslinked gel particle according to claim 1 and 2, 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.
4. pre-crosslinked gel particle according to claim 1 and 2, wherein, the mass ratio of described astable linking agent and described monomer is 1:300-3000, described monomer refers to the monomer with described astable linking agent generation polymerization crosslinking.
5. pre-crosslinked gel particle according to claim 1 and 2, wherein, described initiator is one or more in vitriolate of tartar, ammonium persulphate and Tetramethyl Ethylene Diamine, in twice polymerization crosslinking process, the mass ratio of described initiator and described monomer is 1:300-5000 during polymerization crosslinking each time.
6. pre-crosslinked gel particle according to claim 1 and 2, wherein, it is the 100-120 order that described profile control and deep flooding fluid turn to the particle diameter of difunctional explosion type pre-crosslinked gel particle.
7. turn to the preparation method of the pre-crosslinked gel particle of use according to the described profile control of claim 1-6 any one and deep flooding fluid, it comprises the following steps:
(1) acrylamide is added in distilled water fully and dissolve, monomer the first solution that to obtain mass percent be 10%-50%;
(2) take distilled water obtains the labile cross linker solution that concentration is 0.01%-0.1% as solvent preparation;
(3) labile cross linker solution is added in monomer the first solution, obtain the first mixing solutions;
(4) purify 15-60 minute to nitrogen injection in the first mixing solutions;
(5), to through in the first mixing solutions of nitrogen purge, adding initiator, after stirring, the thermostat container of putting into 45-80 ° of C is incubated 5-12 hour, obtains the gel piece of plastic;
(6) gel piece is cut into small pieces and dry, obtains stablizing the cross linked gel piece;
(7) acrylamide is added in distilled water fully and dissolve, monomer the second solution that to obtain mass percent be 10%-50%;
(8) take the astable cross-linking agent solution that distilled water is 0.1%-1% as the solvent compound concentration;
(9) astable cross-linking agent solution is added in monomer the second solution, stir 2-4 hour until solution is fully even;
(10) purify 15-60 minute to nitrogen injection in solution;
(11) add the initiator of 0.1g in solution, and stir 2-4 hour until fully evenly, form the second mixing solutions;
(12) the stable cross linked gel piece of drying is ground to form to particle, obtain stablizing the cross linked gel particle;
(13) will stablize the second mixing solutions that the cross linked gel particle is put into step (11), standing 24 hours;
(14) thermostat container that mixing solutions step (13) formed is put into 60 ° of C is incubated 24 hours, obtains the body gel, and drying and grinding obtains described profile control afterwards and deep flooding fluid turns to difunctional explosion type pre-crosslinked gel particle.
8. a flooding method, it is the method that adopts the claim described profile control of 1-6 any one and deep flooding fluid to turn to the pre-crosslinked gel particle of use to carry out displacement of reservoir oil operation, 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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| 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 |
| CN107325306B (en) * | 2017-06-13 | 2019-10-25 | 爱美客技术发展股份有限公司 | The multiple cross-linked gel of chitosan or derivatives thereof and preparation method |
| CN108825188B (en) * | 2018-06-13 | 2019-07-05 | 北京盘开精化科技有限公司 | A method of improving crude output and recovery ratio |
| CN113122214A (en) * | 2019-12-31 | 2021-07-16 | 中国石油天然气股份有限公司 | Composite profile control agent system, injection method and application thereof |
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