CN104087275A - High-temperature-resistant and high-salt-resistant fine gel particle as profile control agent as well as preparation method and application of fine gel particle - Google Patents
High-temperature-resistant and high-salt-resistant fine gel particle as profile control agent as well as preparation method and application of fine gel particle Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant and high-salt-resistant fine gel particle as a profile control agent as well as a preparation method and an application of the fine gel particle. The preparation method of the fine gel particle comprises the following steps of firstly, adding modified starch, a monomer A, a monomer B, a crosslinking agent, an initiator and an accelerant into a reaction kettle according to a certain ratio; and after finishing the polymerization reaction of the six components to form integrated water-based gel, drying, crushing, granulating, screening and performing other process steps to obtain the fine gel particle. The application method of the high-temperature-resistant and high-salt-resistant fine gel particle is as follows: a certain quantity of fine gel particles prepared by using the preparation method are added into a Bingham fluid, the gel particles can be stably suspended without settling under static and dynamic conditions, and then, the whole fluid is injected to the stratum by means of pumping pressure. By using the high-temperature-resistant and high-salt-resistant fine gel particle and the application method thereof, disclosed by the invention, the construction success rate of the gel particle can be greatly increased, and a favorable deep profile control effect can be achieved.
Description
Technical field
The present invention relates to the fine gel particle amendment of a kind of high-temperature-resistant high-salt, relate to the preparation method of this fine gel particle amendment simultaneously, and in shutoff high temperature and high salt oil deposit the application novel method aspect strong water breakthrough passage.
Background technology
High temperature and high salt oil deposit is at China's ubiquity, typical in Zhongyuan Oil Field, and the oily district of part in the oil field such as Xinjiang, triumph, huge port, Ji Dong.These oil fields have entered the middle and later periods of exploitation mostly, and Cut of Oilfield is high, recovery percent of reserves is low, and Tapping Residual Oil is large, but because the feature of high temperature and high salt all lost efficacy the increasing oil control water measure of commonly using.
Take the recover the oil Wen Nan oil field of four factories, Zhongyuan Oil Field is example, Wen Nan oil field is positioned at Dong Pu depression central uplift belt literary composition and stays the southern secondary graben of structure, a surpressure, high temperature Complicated Fault-Block Hydrocarbon Reservoir, oil reservoir depth of burial 2210～3800m, pressure factor 1.2～1.8 under husky two times of major reservoir, Sha Sanshang, Sha Sanzhong, husky three, 92～140 ℃ of formation temperature, reservoir porosity 11.4%～21.6%, water is surveyed rate of permeation (43.5～2289.5) * 10
-3μ m
2, variation coefficient of permeability 0.7～0.98, permeability grade 5.06～64.83.Formation water salinity (21～34) * 10
4mg/L, water type is CaCl
2type, belongs to typical high temperature and high salt heterogeneous reservoir.The big area water logging at present of the good class main layer of this oil field producing status after waterflooding for many years, comprehensive water cut surpasses 80%, and local well is moisture up to 99%, and the poor difficulty for two class layer water-driven of reservoir properties.In order to improve Development Response of Oilfield, in the urgent need to finding the profile control and water plugging technology that is applicable to such oil reservoir.It is 90 ℃ that conventional polyacrylamide is adjusted the ceiling temperature of stifled system application, can not meet the job requirements in oil field completely.To this, aspect profile control and water plugging, this factory has introduced three kinds of amendments such as gel particle amendment, inorganic gel profile control agent, rubber grain amendment after making thorough investigation and study, and the amendment of this three types all can steady in a long-termly exist under high temperature and high salt environment.But in implementation process, find at the scene, inorganic gel profile control agent injection pressure when construction rises very fast, follow-up plugging agent injects difficulty, and rubber grain amendment has heatproof, shear-stable advantage, that a kind of machinery stops up stronger system, but also show as in construction process, supercharging is fast, pressure is high, injection is difficult, all can not meet the injection requirement of oil reservoir.And gel particle amendment can meet the injection requirement in Wen Nan oil field, after profile control, well intake profile has clear improvement, and injection pressure rises, and main force's water accepting layer is effectively controlled, and new layer is started.And gel particle has solved Permeabilty agent and has entered the problems such as the not plastic that causes because of the various complicated reasons such as dilution, shearing, degraded, absorption behind stratum or gel-forming property variation, gel particle preparation is simple, easy construction, safety non-toxic, in the shutoff of strong water breakthrough passage, has very large prospect.But many deficiencies in implementation process, have also been found at the scene: although gel particle has the advantage of resistance to abnormal high temperature, but suspension is poor, enter near being easily deposited in borehole after pit shaft and result in blockage, affect normal construction, and construction finishes rear water ratio and significantly rises again within short duration, and the validity period that makes to construct is short, and intake profile test shows more even, this explanation gel particle is mainly blocked in immediate vicinity of wellbore, and the surplus oil of low-permeability layer is employed preferably.
Therefore, in order to extend the validity period of gel particle profile control, improve the effect of increasing production after profile control construction, develop injection efficiency and can enter well the temperature resistance salt tolerant granular profile control agent that earth formation deep and shut-off capacity are strong and seem extremely important.
Summary of the invention
The object of the present invention is to provide the fine gel particle amendment of a kind of high-temperature-resistant high-salt, this amendment not only has the premium properties of high-temperature-resistant high-salt, and suspension, all relatively good with stratum compatibility.Meanwhile, the present invention also provides preparation method and the application novel method of the fine gel particle amendment of above-mentioned high-temperature-resistant high-salt.Utilize the application method described in the fine gel particle amendment of the high-temperature-resistant high-salt of researching and developing in the present invention and the present invention in high temperature and high salt oil deposit, can obtain very high power and the deep profile controlling effect preferably of being constructed into.
Concrete technical solution of the present invention is:
The fine gel particle amendment of high-temperature-resistant high-salt, it is made by following raw material: treated starch, monomer A, monomers B, linking agent, initiator, promotor and water; Each raw material consumption is as follows: the massfraction of treated starch is 4%～5%, the massfraction of monomer A is 3%～4%, the massfraction of monomers B is 1%～2%, the massfraction of linking agent is 0.04%～0.06%, the massfraction of initiator is 0.05%～0.15%, the massfraction of promotor is 0.2%-0.4%, and other is water, and the massfraction sum of each component is 100%; Described monomer A is acrylamide, and monomers B is 2-acrylamide-2-methylpro panesulfonic acid.
Preferably, the treated starch described in 5g is dissolved in 95g water, dissolution time is 45min completely, and the treated starch aqueous solution after dissolving is completely homogeneous system; Described treated starch comes from the prosperous photochemical factory of Hebei Renqiu; Described linking agent is N, N '-methylene-bisacrylamide, and described initiator is Potassium Persulphate and the sodium bisulfite mixture that 2:1 forms in mass ratio, described promotor is sodium hydroxide.
The particle diameter of this fine gel particle amendment can independently be selected, particle diameter within the scope of>=10 μ m all can, preferred particle size range is 10 μ m-53 μ m, density is 1.21g/cm
3.
A preparation method for the fine gel particle amendment of high-temperature-resistant high-salt, comprises the following steps:
(1) treated starch is evenly added in water lentamente, slowly adds while stirring, after treated starch has added, continue to stir until fully dissolving obtains starch solution;
(2) in starch solution, add monomer A, monomers B, linking agent, initiator and promotor, be stirred to dissolving, obtain reaction mixture; Described monomer A is acrylamide, and monomers B is 2-acrylamide-2-methylpro panesulfonic acid;
(3) reaction mixture is put and within the thermostat container that is greater than 40 ℃ 5-10 hour, made its polymerization, obtain whole gel, be semi-solid state;
(4) the fine gel particle amendment of high-temperature-resistant high-salt of particle diameter >=10 μ m will can be produced after prepared whole gel drying, pulverizing, granulation, sieving technology process.
In preferred steps (1), described treated starch comes from the prosperous photochemical factory of Hebei Renqiu, and the complete dissolution time of 5g treated starch in 95g water is 45min, and the treated starch aqueous solution is homogeneous system.
In preferred steps (2), described linking agent is N, N '-methylene-bisacrylamide, and described initiator is Potassium Persulphate and the sodium bisulfite mixture that 2:1 forms in mass ratio, described promotor is sodium hydroxide.
An application method for the fine gel particle amendment of high-temperature-resistant high-salt, is specially the fine gel particle amendment of high-temperature-resistant high-salt and Bingham fluid is used in conjunction with strong water breakthrough passage in shutoff high temperature and high salt oil deposit.
Preferably, above-mentioned Bingham fluid is prepared by following steps:
(1) sodium bentonite that is 1.5g by quality adds in 48.5g water, after fully stirring, places 24 hours, obtains the sodium bentonite aqueous solution;
(2) stablizer that is 0.6g by quality is added in 49.4g water, stirs, and obtains the stablizer aqueous solution; Described stablizer be by Vltra tears and positive colloid in mass ratio 2:1 mix;
(3) after the stablizer aqueous solution that sodium bentonite aqueous solution step (1) being made and step (2) make, stir, obtain Bingham fluid.
Preferably, above-mentioned application method specifically comprises following operation:
(1) note preposition slug: in stratum, inject described Bingham fluid;
(2) note principal piece plug: to the mixture that injects the described fine gel particle amendment of high-temperature-resistant high-salt and described Bingham fluid in stratum, the massfraction of the fine gel particle amendment of wherein said high-temperature-resistant high-salt is 5%-10%, and surplus is described Bingham fluid; When injection pressure stops injecting during higher than 1.5 times of initial formation pressure;
(3) note rearmounted slug: in stratum, inject described Bingham fluid;
(4) note local water.
It is all stratum containing strong water breakthrough passage that 150 ℃, salinity are 300000mg/L that aforesaid method can be used for temperature.
Useful technique effect of the present invention is:
(1) the fine gel particle of a kind of high-temperature-resistant high-salt provided by the present invention has splendid visco-elasticity, migration ability in stratum is strong, easily enter earth formation deep, and the stable performance under high temperature and high salt environment is lasting, thereby the effect of deep profile controlling can be kept the long period.
(2) the poor and particle size of existing gel particle suspension difficult with stratum compatibility be that gel particle is in the defect of application aspect maximum, the poor dosing concentration that causes of suspension can not be too high, during rig-site utilization, gel particle concentration is all lower than 0.5%, cause long construction period, particle size is crossed conference and is made particle easily pile up and be blocked in immediate vicinity of wellbore, the undersized degradation that can make again gel particle.The fine gel particle of high-temperature-resistant high-salt provided by the present invention not only has the premium properties of high-temperature-resistant high-salt, and suspension, all better with stratum compatibility, can obtain very high power and the deep profile controlling effect preferably of being constructed into, and can improve recovery ratio.
(3) preparation method of the present invention have select materials and consumption reasonable, preparation technology is simple, low cost and other advantages can be produced the fine gel particle amendment of the high-temperature-resistant high-salt series product with different water suction multiples, absorption speed, particle radius and intensity.
(4) in application method provided by the present invention, no matter fine gel particle is all can stable suspersion in Bingham fluid under static conditions or dynamic condition.
(5) in application method provided by the present invention, can determine corresponding fine gel particle size range by the rate of permeation on stratum, can determine the performance of Bingham fluid by selected fine gel particle size, implementation process is flexible.
(6) in application method provided by the present invention, the mass concentration of fine gel particle can be increased to more than 5%, can shorten greatly the engineering time and can improve being constructed into power.
Accompanying drawing explanation
Fig. 1 illustrates the Young's modulus of the fine gel particle of different-grain diameter;
Fig. 2 illustrates the loss modulus of the fine gel particle of different-grain diameter;
Fig. 3 illustrates the flow curve of Bingham fluid;
Fig. 4 is dynamic physical modeling experiments device schematic diagram;
The injection pressure of the fine gel particle that Fig. 5 illustrates 270 orders (53 μ m) under different mass mark;
The injection pressure of the fine gel particle that Fig. 6 illustrates 325 orders (44 μ m) under different mass mark;
The injection pressure of the fine gel particle that Fig. 7 illustrates 400 orders (37 μ m) under different mass mark;
It is that 10% particle diameter is the fine gel particle of 325 orders (44 μ m) the migration curve in stratum that Fig. 8 illustrates massfraction.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated, but the invention is not restricted to following embodiment.
One, the preparation of the fine gel particle amendment of high-temperature-resistant high-salt
The treated starch of 50g is added in the water of 898g, after fully dissolving, add again the 2-acrylamide-2-methylpro panesulfonic acid (AMPS) of 15g, the acrylamide (AM) of 35g, the N of 0.5g, the sodium bisulfite of the sodium hydroxide of N '-methylene-bisacrylamide, 3g, the Potassium Persulfate of 0.6g and 0.3g, until solution stirring fully after sealing, put 40 ℃ of thermostat containers and take out after 10 hours, solution has now become whole block gel.Take out the techniques such as block whole gel is dried, pulverizing, granulation and make the fine gel particle that particle diameter is 270 orders (53 μ m), 325 orders (44 μ m), 400 orders (37 μ m), 550 orders (25 μ m), 800 orders (15 μ m) and 1250 orders (10 μ m).
Two, the static properties of the fine gel particle amendment of high-temperature-resistant high-salt test
It is 30 * 10 that the gel particle of different-grain diameter prepared in above-mentioned steps is put into homemade salinity
4after in the salt solution of mg/L, be held in the thermostat container of 150 ℃ and investigate its stability.The static evaluation experimental result of fine gel particle amendment is in Table 1, and fine gel particle provided by the present invention has splendid temperature resistance salt resistant character as shown in Table 1.
Table 1
By the fine gel particle of different-grain diameter prepared in above-mentioned steps, at 150 ℃, through salinity, be 30 * 10
4the saline soak of mg/L is tested its visco-elasticity after 60 days.Testing tool is the flat plate model of RS-600 rheometer.Test result as depicted in figs. 1 and 2, the Young's modulus of the fine gel particle that Fig. 1 is different-grain diameter, the loss modulus of the fine gel particle that Fig. 2 is different-grain diameter.Known from Fig. 1 and Fig. 2, although Young's modulus and the loss modulus of fine gel particle all reduce along with reducing of grain size, even but at the lower fine gel particle of minimum grain size size 1250 orders (10 μ m), also can keep very high visco-elasticity, this gel particle that different-grain diameter provided by the present invention is described is 30 * 10 at 150 ℃ through salinity
4the saline soak of mg/L is keeping high visco-elasticity for 60 days afterwards, and this is that fine gel particle is migrated smoothly to earth formation deep and the physical basis that has very high plugging strength in stratum.
Three, the research and development of Bingham fluid and performance test thereof
The salinity of test water is 30 * 10
4mg/L.The sodium bentonite that is 1250 orders (10 μ m) by 1.5g particle diameter is added in the water of 48.5g, stirs fully, obtains sodium bentonite solution.The stablizer being comprised of 0.4g Vltra tears and 0.2g positive colloid is added in 49.6g water, stirs fully, obtain stabiliser solution.Sodium bentonite solution and stabiliser solution are mixed, after stirring, be the Bingham fluid described in the present invention.The viscosity of the Bingham fluid of gained is 30.3mPa.s, and density is 1.08g/cm
3.Utilize RS-600 rheometer to survey the flow curve of Bingham fluid, as shown in Figure 3.According to the nineteen ninety-five people's such as Lee of Daqing Petroleum Institute rainbow research, in the fluid of band surrender application, can there is the phenomenon that suspends not sink, the critical condition that particle suspends in Bingham fluid is:
ρ in formula
sfor the density (after expanding) of gel particle, the particle diameter that d is gel particle (after expanding), τ
ofor the yielding stress of suspension, the density that ρ is suspension.As can be known from Fig. 3, according to curve-fitting results, the yield value of fluid is 0.019.Utilizing formula (1) can calculate the Bingham fluid provided by the present invention particle diameter that can suspend is the gel particle of 150 μ m.And the gel particle particle diameter providing in the present invention is all less than 150 μ m, so the Bingham fluid providing in the present invention fine gel particle that can suspend and provide in the present invention.
The fine gel particle of 270 orders of 5g (53 μ m) is added in the Bingham fluid of 45g, and after stirring, the total mass of gained mixture is 50g, and density is 1.13g/cm
3.After standing 30min, get the upper part 20mL of fluid mixture, surveying its quality is 22.6g, and density is 1.13g/cm
3, under fluid mixture, the quality of part is 27.4g, density is 1.13g/cm
3, the prepared fine gel particle in the present invention that can suspend uniformly of the Bingham fluid in test experiments explanation the present invention.
Four, the injection efficiency of fine gel particle and transfer ability test
Dynamic physical modeling experiments condition be take Wen Nan oil field as foundation, and the formation temperature in Wen Nan oil field is 92～140 ℃, and water is surveyed rate of permeation (43.5～2289.5) * 10
-3μ m
2, formation water salinity (21～34) * 10
4mg/L.Laboratory experiment temperature is 140 ℃, and Simulated Water salinity is 300000mg/L.As shown in Figure 4, in test, the length of fill out sand tube is 1m to physical simulation experiment device, and diameter is 2.5cm, and rate of permeation is 2200mD, and porosity is 37%, and volume of voids is 217cm
3.Rate of permeation by fill out sand tube can gel particle corresponding to initial option.Selecting particle diameter is that three kinds of particulated gels of 270 orders (53 μ m), 325 orders (44 μ m), 400 orders (37 μ m) are as experimental subjects.
Three kinds of particulated gels that are 270 orders (53 μ m), 325 orders (44 μ m), 400 orders (37 μ m) by particle diameter prepared in the present invention are added in the Bingham fluid of researching and developing in the present invention, form the fluid mixture of different mass mark.Utilize the injection efficiency of these three kinds of fine gel particles of dynamic physical modeling experiments device to test.In test process, keep the injection rate of fine gel particle constant, be 0.2PV, i.e. 43.6cm
3, being converted into quality is 52.7g.Injection speed in test process is 0.2mL/min.By adjusting the massfraction of fine gel particle in Bingham fluid, change the volume that injects fluid.Test result is as shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8.Fig. 5 is that particle diameter is the fine gel particle of 270 orders (53 μ m) the injection curve under different mass mark.Fig. 6 is that particle diameter is the fine gel particle of 325 orders (44 μ m) the injection curve under different mass mark.Fig. 7 is that particle diameter is the fine gel particle of 400 orders (37 μ m) the injection curve under different mass mark.From Fig. 5-7, the fine gel particle providing in the present invention and the injection pressure of Bingham fluid mixture are lower, can enter smoothly stratum, illustrate that the fine gel particle providing in the present invention has good injection.Fig. 8 is massfraction is 10%, particle diameter is 325 orders (44 μ m) the fine gel particle migration curve in stratum, and as can be known from Fig. 8, fine gel particle can progressively be migrated to earth formation deep, can play the effect of earth formation deep fluid diversion.This explanation fine gel particle provided by the present invention has splendid transfer ability in stratum.Therefore the requirement that the fine gel particle that, the present invention researches and develops and application method thereof can meet the deep profile controlling of high temperature and high salt oil deposit.
Claims (10)
1. the fine gel particle amendment of high-temperature-resistant high-salt, it is characterized in that being made by following raw material: treated starch, monomer A, monomers B, linking agent, initiator, promotor and water; Each raw material consumption is as follows: the massfraction of treated starch is 4%～5%, the massfraction of monomer A is 3%～4%, the massfraction of monomers B is 1%～2%, the massfraction of linking agent is 0.04%～0.06%, the massfraction of initiator is 0.05%～0.15%, the massfraction of promotor is 0.2%-0.4%, and other is water, and the massfraction sum of each component is 100%; Described monomer A is acrylamide, and monomers B is 2-acrylamide-2-methylpro panesulfonic acid.
2. the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 1, is characterized in that: the treated starch described in 5g is dissolved in 95g water, and dissolution time is 45min completely, and the treated starch aqueous solution after dissolving is completely homogeneous system; Described linking agent is N, N '-methylene-bisacrylamide, and described initiator is Potassium Persulphate and the sodium bisulfite mixture that 2:1 forms in mass ratio, described promotor is sodium hydroxide.
3. the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 1, is characterized in that: the particle size range of this fine gel particle amendment is 10 μ m-53 μ m, and density is 1.21g/cm
3.
4. a preparation method for the fine gel particle amendment of high-temperature-resistant high-salt, is characterized in that comprising the following steps:
(1) treated starch is evenly added in water lentamente, slowly adds while stirring, after treated starch has added, continue to stir until fully dissolving obtains starch solution;
(2) in starch solution, add monomer A, monomers B, linking agent, initiator and promotor, be stirred to dissolving, obtain reaction mixture; Described monomer A is acrylamide, and monomers B is 2-acrylamide-2-methylpro panesulfonic acid;
(3) reaction mixture is put and within the thermostat container that is greater than 40 ℃ 5-10 hour, made its polymerization, obtain whole gel, be semi-solid state;
(4) the fine gel particle amendment of high-temperature-resistant high-salt will be produced after prepared whole gel drying, pulverizing, granulation, sieving technology process.
5. the preparation method of the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 4, it is characterized in that: in step (1), described treated starch comes from the prosperous photochemical factory of Hebei Renqiu, the complete dissolution time of 5g treated starch in 95g water is 45min, and the treated starch aqueous solution is homogeneous system.
6. the preparation method of the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 4, it is characterized in that: in step (2), described linking agent is N, N '-methylene-bisacrylamide, described initiator is Potassium Persulphate and the sodium bisulfite mixture that 2:1 forms in mass ratio, and described promotor is sodium hydroxide.
7. an application method for the fine gel particle amendment of high-temperature-resistant high-salt, is characterized in that: the fine gel particle amendment of high-temperature-resistant high-salt and Bingham fluid are used in conjunction with strong water breakthrough passage in shutoff high temperature and high salt oil deposit.
8. the application method of the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 7, is characterized in that described Bingham fluid prepared by following steps:
(1) sodium bentonite that is 1.5g by quality adds in 48.5g water, after fully stirring, places 24 hours, obtains the sodium bentonite aqueous solution;
(2) stablizer that is 0.6g by quality is added in 49.4g water, stirs, and obtains the stablizer aqueous solution; Described stablizer be by Vltra tears and positive colloid in mass ratio 2:1 mix;
(3) after the stablizer aqueous solution that sodium bentonite aqueous solution step (1) being made and step (2) make, stir, obtain Bingham fluid.
9. the application method of the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 7, is characterized in that specifically comprising following operation:
(1) note preposition slug: in stratum, inject described Bingham fluid;
(2) note principal piece plug: to the mixture that injects the described fine gel particle amendment of high-temperature-resistant high-salt and described Bingham fluid in stratum, the massfraction of the fine gel particle amendment of wherein said high-temperature-resistant high-salt is 5%-10%, and surplus is described Bingham fluid; When injection pressure stops injecting during higher than 1.5 times of initial formation pressure;
(3) note rearmounted slug: in stratum, inject described Bingham fluid;
(4) note local water.
10. the application method of the fine gel particle amendment of a kind of high-temperature-resistant high-salt according to claim 7, is characterized in that: it is all stratum containing strong water breakthrough passage that 150 ℃, salinity are 300000mg/L that the method can be used for temperature.
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