CN103113873A - Modifying and flooding agent for reutilization of residual polymers in formation and application thereof - Google Patents
Modifying and flooding agent for reutilization of residual polymers in formation and application thereof Download PDFInfo
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- CN103113873A CN103113873A CN2013100702423A CN201310070242A CN103113873A CN 103113873 A CN103113873 A CN 103113873A CN 2013100702423 A CN2013100702423 A CN 2013100702423A CN 201310070242 A CN201310070242 A CN 201310070242A CN 103113873 A CN103113873 A CN 103113873A
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Abstract
The invention relates to a modifying and flooding agent for reutilization of residual polymers in a formation and an application thereof. The modifying and flooding agent for the reutilization of the residual polymers in the formation consists of 0.8-2.0% of aqueous medium dispersing type polyacrylamide and formation water. The modifying and flooding agent, provided by the invention, has the advantages of simplicity in system constitution, environment friendliness, short dissolving time, simple construction process, few utilized devices and suitability in field use of offshore polymer flooding. According to the modifying and flooding agent for the reutilization of the residual polymers in the formation, a flocculation system can be formed in the polymer flooding process and the subsequent water driving process by utilizing the residual polymers in the formation so as to effectively block a high-permeability channel, so that the modifying and flooding agent has capacities for delaying the penetration of polymer solution in the formation and improving a conformance factor, and the recovery efficiency of crude oil is improved, and the concentrations of the produced polymers are lowered.
Description
Technical field
The present invention relates to a kind of residual polymer in formation recycling adjusting driving agnet and application thereof, belong to the Oil-Gas Field Development Engineering technical field.
Background technology
The exploitation of offshore oilfield is subjected to the restriction of platform life span, through the research of nearly more than ten years polymer flooding laboratory experiment and and the exploitation of field test, successfully polymer flooding is used for the Offshore Heavy Oil Field oil reservoir, and has obtained efficient output and economic benefit.But the formation condition due to Offshore Heavy Oil Field oil reservoir harshness, exploitation along with oilfield polymer flooding, Reservoir Permeability is differential more becomes larger, channelling is serious, the output polymer concentration to occur too high for the well of being imitated of increasing polymer flooding, water-cut increase is problem faster, greatly reduces the oil displacement efficiency of polymer flooding; After a large amount of in-house laboratory investigations shows injection of polymer simultaneously, a large amount of polymkeric substance is stranded in the stratum in the mode of adsorbing and capture, and does not bring into play the effect of the displacement of reservoir oil, causes environmental pollution from the oil well output; The ability of enhancing oil recovery in polymer flooding is only finally 10% left and right, and after polymer flooding, oil reservoir still approximately has 50% also extraction of underground crude oil.The problem that further improves oil recovery factor after polymer flooding has become the large problem that how to keep oilfield stable production after present notes gather.
At present because land maturing field mostly enters high water-cut stage, the further investigation such as Zhao Fulin, Dai Caili proposes the residual polymer in formation reutilization technology, and carry out test in place at Shengli Oil Field, Henan Oil Field, Daqing oil field, obtain polymkeric substance output concentration and reduce by 30%～70%, after polymer flooding, recovery ratio improves 5%～10% good effect again.What wherein be most widely used in the residual polymer in formation reutilization technology is flocculation technique, preferred flocculation agent is stabilization sodium soil YG340-1, it mainly is comprised of inorganic bentonite and stablizer, have excellent property, the advantage such as cheap, but inject stabilization sodium soil YG340-1 after polymer flooding and may have the risk of stopping up non-purpose oil reservoir, for the specific reservoir condition of offshore oilfield, the de-plugging measure that offshore oilfield is follow-up and plugging removal effect also can cause detrimentally affect to the stable yields in oil field.In addition, it is dry powder that the Main Morphology of polymkeric substance is used in the operation of onshore oil field polymer flooding, and its swelling stage is longer, and dissolution rate is slow, needs configuration large-scale dissolving and curing equipment, takes up room large, and the use in oil field at sea is restricted.
Summary of the invention
Deficiency for recycling adjusting driving agnet in prior art, the invention provides a kind of residual polymer in formation recycling adjusting driving agnet and application thereof, this recycling adjusting driving agnet mainly is applicable to the oil field that polymer flooding is carried out at the sea, it can effectively utilize polymer formation flocs unit residual in the stratum to improve the development effectiveness that turns water drive after offshore oilfield polymer flooding and polymer flooding, improves oil recovery factor and reduces and produce poly-concentration.
Terminological interpretation
Polymer flooding refers to the displacement of reservoir oil method of polymers soln as oil-displacing agent, belongs to chemical flooding;
Residual polymer in formation refers to remain in after oilfield polymer flooding the polymkeric substance that injects as oil-displacing agent in the stratum;
The water-in-water type cation emulsion: acrylamide monomer (AM) carries out the resulting outer appearnce of dispersion polymerization like the aqueous dispersion of emulsion with other water-soluble monomer in a kind of inorganic salt solution of low-molecular weight water-soluble polymer stablizer.About the master thesis " preparation of polyacrylamide water bag water copolymer emulsion " of technology of preparing referring to the master thesis of Fu Zhijian " cationic polyacrylamide " water Bao Shui " emulsion synthetic and use ", Xing Fanbin.
Technical scheme of the present invention is as follows:
A kind of residual polymer in formation recycling adjusting driving agnet, raw materials quality is than composed as follows:
Water medium decentralized polyacrylamide 0.8～2.0%,
The local water surplus.
According to the present invention, described water medium decentralized polyacrylamide is selected from one of water-in-water type cation emulsion WF20, water-in-water type cation emulsion WF40, water-in-water type cation emulsion WF70 or combination;
According to the present invention, preferred, described water medium decentralized polyacrylamide is water-in-water type cation emulsion WF40.But water-in-water type cation emulsion WF40 market is bought, and by mass percentage, solid content is 46.3%～48.2%, and effective content is 18%～20%, and relative molecular mass is 750 * 10
4～800 * 10
4, cationic degree is 38～41.
According to the present invention, preferred, described local water is to contain Na
+, Ca
2+, Mg
2+, SO
4 2 –, HCO
3 –And Cl
–Deionized water, wherein, described Na
+Concentration be 950.89mgL
-1, Ca
2++ Mg
2+Concentration is 30.61mgL
-1, CO
3 2-Concentration be 107.14mgL
-1, SO
4 2 –Concentration be 43.62mgL
-1, HCO
3 –Concentration be 924.45mgL
-1, Cl
–Concentration be 845.52mgL
-1
The preparation of described local water is respectively with CaCl
2, MgCl26H
2O, Na
2SO
4, NaCO
3, NaHCO
3, NaCl joins in deionized water.Control Na
+, Ca
2+, Mg
2+, SO
4 2 –, CO
3 2-, HCO
3 – andCl
–Concentration gets final product as mentioned above.
The application of residual polymer in formation recycling adjusting driving agnet of the present invention in the recovery ratio that improves the offshore oilfield polymer flooding.The polymkeric substance that described offshore oilfield polymer flooding adopts is partially hydrolyzed polyacrylamide, and code name is BHPM, and solid content is 88.5%～89.7%, and relative molecular mass is 2000 * 10
4～2200 * 10
4, degree of hydrolysis is 24.2%～25.0%.
During application, the adjusting driving agnet of the present invention that fully dissolving is good is injected water injection well, be injected in the target oil reservoir by water injection well.This adjusting driving agnet preferentially enters rate of permeation high stratum, interacts with residual polymkeric substance in the stratum, forms the flocculation system that is difficult to flow, and controls the height that polymer flooding produces and oozes passage, makes follow-up water filling or polymer injection enter middle low permeability layer; Thereby improve the intake profile on stratum, improve oil recovery factor, and reduce the concentration of output polymkeric substance.
But water-in-water type cation emulsion of the present invention market is bought, and also can prepare by prior art.
Residual polymer in formation recycling adjusting driving agnet of the present invention for the recycling of the residual polymer in formation after the offshore oilfield polymer flooding, improves the development effectiveness of offshore oilfield polymer flooding, realizes improving the target of oil recovery factor and reduction output polymer concentration.The water-in-water type cation emulsion very easily dissociates in water, its group shows positive polarity, can form comparatively fine and close flocculation system by " electrically neutralization " and " absorption～bridge formation～winding " effect with the anionic group that is adsorbed on residual polyalcohol stratum sandstone surface adsorption and that be dissolved in the inferior quality concentration in the rock core hole, low relative molecular weight, high degree of hydrolysis.The viscosity of the viscosity ratio residual polyalcohol solution of the recycling adjusting driving agnet of simultaneously follow-up injection is lower, and easier " fingering " enters most permeable zone, constantly and the residual polyalcohol formation flocculation system that meets, comes the shutoff most permeable zone in moving forward process.
The using method of residual polymer in formation recycling adjusting driving agnet of the present invention comprises the steps:
Adjusting driving agnet of the present invention is added in water injection well, is injected into by water injection well in the oil reservoir in target oil field, interact with wherein residual anionic polymer, carry out the deep transfer drive, improve oil recovery factor.
The invention has the beneficial effects as follows:
(1) the present invention is in conjunction with the characteristics of offshore oilfield Efficient Development and emphasis environment protection; utilize the water-in-water type cation emulsion to join in recycling transfer drive system; have the breakthrough of polymers soln in the stratum and the ability of raising sweep efficiency of delaying; it utilizes residual polymer in formation to recycle the effect that the deep transfer drive improves oil recovery factor after can playing polymer flooding; can avoid again stopping up, the injury on stratum is reduced to minimum.
(2) adjusting driving agnet composing system of the present invention is simple, and environmental friendliness has dissolution rate faster, and low for equipment requirements, injection technology is simple, and use at the scene that is highly suitable for the offshore oilfield polymer flooding.By in the polymer flooding process and the water injection well in follow-up water drive inject residual polymer in formation recycling adjusting driving agnet, form the flocculation system with sealing characteristics with the residual polyalcohol interaction in most permeable zone, the high passage that oozes of control that can be very strong, force follow-up water filling or polymkeric substance to enter middle low permeability layer, flocculation system can rest on the different positions of oil reservoir simultaneously, improve the intake profile on stratum, improve oil recovery factor.Residual polymer in formation recycling adjusting driving agnet of the present invention has important using value in the oil-gas field development field at sea.
Description of drawings
Fig. 1 is that embodiment 2 residual polymer in formation recycling adjusting driving agnet viscosity are with the variation relation curve of churning time
Fig. 2 is that embodiment 3 residual polymer in formation recycling adjusting driving agnet viscosity are with the variation relation curve of concentration
Fig. 3 is the variation relation curve of embodiment 4 residual polymer in formation recycling adjusting driving agnet viscosity with temperature
Fig. 4 is the flocculation phenomenon of embodiment 6 residual polymer in formations and residual polymer in formation recycling adjusting driving agnet, the a-residual polymer in formation; B-residual polymer in formation reuse agent; The c-flocculation system;
Fig. 5 injects after embodiment 8 recycling adjusting driving agnets fill out sand tube reservoir core plugging rate curve over time
Embodiment
Further illustrate the present invention below in conjunction with specific embodiments and the drawings, but the present invention is not limited to following examples.
The experimental technique that uses in following embodiment is ordinary method if no special instructions.In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
The polymkeric substance that use in oil field in embodiment is the anionicsite hydro-polyacrylamide, and code name is BHPM, and solid content is 88.5%～89.7%, and relative molecular mass is 2000 * 10
4～2200 * 10
4, degree of hydrolysis is 24.2～25.0%.
Terminological interpretation in embodiment:
Recovery ratio refers to that the crude oil volume of extraction takes up an area the ratio of the cubic capacity of layer Crude Oil;
Sweep efficiency refers to the ratio of oil reservoir volume that oil-displacing agent feeds through to and whole oil-containing volume;
1PV refers to 1 times of rock pore volume; ML.
The concentration of residual polymer in formation recycling adjusting driving agnet refers to that residual polymer in formation recycles the content of the water medium decentralized polyacrylamide (water-in-water type cation emulsion WF40) in adjusting driving agnet.
Embodiment 1: the composition of residual polymer in formation recycling adjusting driving agnet
Residual polymer in formation recycling adjusting driving agnet, in adjusting driving agnet total amount 100%, the water medium decentralized polyacrylamide by 0.8%～2.0% and the local water of surplus form;
Described water medium decentralized polyacrylamide is selected from water-in-water type cation emulsion WF40(Beijing Demei Gaoke Technology Co., Ltd), solid content is 46.3%～48.2%, and effective content is 18%～20%, and relative molecular mass is 750 * 10
4～800 * 10
4, cationic degree is 38～41.
Described local water is to contain Na
+, Ca
2+, Mg
2+, SO
4 2 –, HCO
3 –And Cl
–Deionized water, wherein, described Na
+Concentration be 950.89mgL
-1, Ca
2++ Mg
2+Concentration is 30.61mgL
-1, CO
3 2-Concentration be 107.14mgL
-1, SO
4 2 –Concentration be 43.62mgL
-1, HCO
3 –Concentration be 924.45mgL
-1, Cl
–Concentration be 845.52mgL
-1
The preparation of local water: respectively with CaCl
2, MgCl
26H
2O, Na
2SO
4, NaCO
3, NaHCO
3, NaCl joins in deionized water.Control Na
+, Ca
2+, Mg
2+, SO
4 2 –, CO
3 2-, HCO
3 –And Cl
–Concentration gets final product as mentioned above.
The solubility property of embodiment 2, water-in-water type cation emulsion WF40
Take the water-in-water type cation emulsion WF40 described in 1.5g embodiment 1 and join in the stratum injected water described in 98.5g embodiment 1, preparation quality concentration is 1.5% recycling adjusting driving agnet solution.Constant speed stirs under the rotating speed of 400r/min, every the 2min sampling once, and at 20 ℃ and 7.34s
-1Condition under do not recycle in the same time the viscosity of adjusting driving agnet solution with Brookfield DV-III viscometer determining, at a time, the variation between the adjacent viscosity number of measuring for 2 times is not more than 5%, this is the dissolution time under this shearing rate constantly.The viscosity of solution with the relation of churning time as shown in Figure 1.
Experimental result shows, the water-in-water type cation emulsion has solubility property preferably, and the dissolution time in the time of 20 ℃ is 6～10min.This is because the water-in-water type cation emulsion is compared with HPAM dry powder, the specific surface of particle is much larger, and the part swelling arranged in the polymerization process of its preparation, when solution contacts with water molecules, external phase and water molecules in solution dissolve each other, reticulated structure is destroyed, is conducive to the dissolving of solution and salt solution, convenient on-the-spot online injection allocation.
The sticking dense relation of embodiment 3, residual polymer in formation recycling adjusting driving agnet
Taking the water-in-water type cation emulsion WF40 described in 3.0g embodiment 1 joins in the stratum injected water described in 97.0g embodiment 1, stirring and dissolving 10min under the condition of 400r/min, preparation quality concentration is the mother liquor of 3% recycling adjusting driving agnet, then be diluted to mass concentration and be 0.5%, 1.0%, 1.5%, 2.0%, 2.5% purpose liquid, at 20 ℃ and 7.34s
-With the viscosity number of Brookfield viscometer determining solution, the results are shown in Figure 2 under 1 condition.As shown in Figure 2, the viscosity of residual polymer in formation recycling adjusting driving agnet is along with the increase of concentration is index rising variation tendency, and when mass concentration was 1.5%, viscosity was 22.4mPas, and this explanation has good injection.
The sticking kelvin relation of embodiment 4, residual polymer in formation recycling adjusting driving agnet
Taking the water-in-water type cation emulsion WF40 described in 1.5g embodiment 1 joins in the stratum injected water described in 98.5g embodiment 1, stirring and dissolving 10min under the condition of 400r/min, preparation quality concentration is 1.5% recycling adjusting driving agnet, at differing temps and 7.34s
-1The viscosity number with Brookfield viscometer determining solution under condition the results are shown in Figure 3.As shown in Figure 3, the viscosity of residual polymer in formation recycling adjusting driving agnet reduces along with the rising of temperature.When stratum residual polyalcohol recycling adjusting driving agnet enters the injection process of earth formation deep from ground, viscosity reduces gradually, and good mobility is arranged, and can enter in most permeable zone to meet with the residual polymer in formation that is detained and dissolve, flocculation reaction occurs, the shutoff most permeable zone.
The residual polymer in formation recycling adjusting driving agnet of embodiment 5, different mass concentration and the flocculating experiment of residual polyalcohol BHPM
Take the water-in-water type cation emulsion WF40 described in 3.0g embodiment 1 and join the stratum injected water described in 97.0g embodiment 1, stirring and dissolving 10min under the condition of 400r/min, preparation quality concentration is 3.0% mother liquor, then is diluted to mass concentration and is 0.5%, 1.0%, 1.5%, 2.0% purpose liquid a.Take the polymer anion partially hydrolyzed polyacrylamide BHPM that the 0.5g oil field uses and join in the injected water of 99.5g stratum, be mixed with the mother liquor that mass concentration is 5000mg/L, placed 6～8 hours under reservoir temperature (57 ℃) condition; Then being diluted to mass concentration is the purpose liquid b of 200mg/L, 400mg/L and 800mg/L.Purpose liquid a after diluting before flocculating experiment and purpose liquid b sheared 20 seconds with 1 grade, Warning agitator, simulated this recycling adjusting driving agnet and polymers soln and injected state after the intense mechanical shearing of borehole is crossed in flow process and shaft bottom through ground.
1. the positively charged ion quality is certain
(purpose liquid a) to measure the 5.0mL mass concentration and be 1.0% recycling adjusting driving agnet, dripping wherein mass concentration is the anionic polymer solution (purpose liquid b) of 600mg/L, stir while dripping until the flocculation volume no longer increases, record drips the cumulative volume of anionic polymer solution (purpose liquid b), result such as table 1.
2. the negatively charged ion quality is certain
Measuring the 5.0mL mass concentration is the anionic polymer solution (purpose liquid b) of 200mg/L, 400mg/L and 800mg/L, (purpose liquid a) to stir concentration while dripping and be 1.5% recycling adjusting driving agnet, until the flocculation volume no longer increases, record drips recycling adjusting driving agnet solution, and (purpose liquid cumulative volume a) the results are shown in Table 1.
The flocculating experiment of the recycling adjusting driving agnet of table 1 different mass concentration and the formation polymer of different mass concentration
As shown in Table 1, residual polymer in formation recycling adjusting driving agnet (purpose liquid a) with the stratum in residual anionic polymer BHPM(purpose liquid b) during complete reaction, the mass ratio of zwitterion is between 1:11～1:15, therefore can according to the practical situation of oilfield polymer flooding, be determined the best working concentration of residual polymer in formation recycling adjusting driving agnet by the mass concentration of anionic polymer BHPM.When the volume of " water Bao Shui " cationic polymer solution of injecting the stratum for the volume that injects the stratum polymkeric substance 1/3 the time, polymer mass concentration is 200mg/L～800mg/L in the stratum simultaneously, when both complete reactions, the zwitterion mass ratio is 1:13, the mass concentration of injecting the residual polymer in formation recycling adjusting driving agnet on stratum is 0.80%～3.2%, consider simultaneously the factor of cost, the mass concentration of preferred residual polymer in formation recycling adjusting driving agnet is 0.80%～2.0%.
According to best yin, yang mass of ion ratio in table 1, measuring the 4.5mL mass concentration is the polymer B HPM solution of 600mg/L, adding 5.5mL concentration is 1.0% residual polymer in formation recycling adjusting driving agnet, fully put into constant temperature 10min under reservoir temperature (57 ℃) condition after concussion, observe flocculation reaction, the flocculation system that forms at last as shown in Figure 4.
Water-in-water type cation emulsion polymkeric substance in residual polymer in formation recycling adjusting driving agnet very easily dissociates in water, its group shows positive electricity, first by " electrically neutralization " effect, and capture in the polymkeric substance of sandstone surface absorption and hole and the anionic group of the polymer surfaces of dissolving forms comparatively fine and close flocculation system; Then when showing excessive existence of cation group of positive electricity, the group that flocculation reaction does not occur stretches in water, by " absorption～bridge formation～winding " effect, forms comparatively loose flocculation system.In addition, because the viscosity of the polymers soln of the viscosity ratio polymer flooding of the formation polymer recycling adjusting driving agnet that injects is lower, easier " fingering " enters most permeable zone, constantly and the residual polyalcohol formation flocculation system that meets, comes the shutoff most permeable zone in moving forward process.The sealing characteristics of embodiment 7, residual polymer in formation recycling adjusting driving agnet
Take the water-in-water type cation emulsion WF40 described in 1.5g embodiment 1 and join in the stratum injected water described in 98.5g embodiment 1, stirring and dissolving 10min under the condition of 400r/min, preparation quality concentration is 1.5% recycling adjusting driving agnet.Take the polymer anion partially hydrolyzed polyacrylamide BHPM that the 0.5g oil field uses and join in the injected water of 99.5g stratum, be mixed with mass concentration and be 5.0% mother liquor, placed 6～8 hours under reservoir temperature (57 ℃) condition; Then being diluted to mass concentration is the purpose liquid of 200mg/L, 400mg/L and 800mg/L.Solution in experiment after dilution all pass through 1 grade, Warning agitator and shears the state of simulating in 20 seconds this recycling adjusting driving agnet and polymers soln are crossed the intense mechanical shearing of borehole through ground injection flow process and shaft bottom after.
Characterize the sealing characteristics of residual polymer in formation recycling adjusting driving agnet with residual resistance factor, experimental procedure comprises: 1. fill and present fill out sand tube, survey rate of permeation (k after water drive is stable
wi); 2. first inject the anionic polymer of different mass concentration, rear implantation quality concentration is 1.5% recycling adjusting driving agnet; 3. stablize 8h in the water bath with thermostatic control of reservoir temperature (57 ℃), then water drive, rate of permeation (k measured after pressure-stabilisation
wa), k
wi/ k
waBe residual resistance factor F
RRThe fill out sand tube core diameter 2.50cm that uses in experiment, long 19.5～20.0cm, injecting anionic polymer is all 0.3PV with the volume that recycles adjusting driving agnet; k
wiAnd k
waBe respectively rock core and block up front and stifled rear water survey rate of permeation, μ m
2Experimental result is as shown in table 2,
The impact of the residual polymer in formation of table 2 different mass concentration on recycling adjusting driving agnet plugging action
As shown in Table 2, inject separately the recycling adjusting driving agnet, rock core is had relatively poor plugging action; After injection of polymer solution, the recycling of reinjecting adjusting driving agnet just improves greatly to the plugging action on stratum.Along with the raising of the mass concentration of residual polymer in formation, the flocs unit volume that reaction generates is larger, and intensity is higher, plugging effect to the stratum is more obvious, but because the flocculation system that generates has certain intensity, flocs unit can be migrated in the stratum, reaches the purpose of deep transfer drive.
The thermal stability of embodiment 8, residual polymer in formation recycling adjusting driving agnet
Table 2 sequence number 4# injection system in embodiment 7 is sealed in tool plug test tube, be placed on volume and the Strength Changes of observing flocculation system in the water bath with thermostatic control of reservoir temperature (57 ℃), measure simultaneously the stifled rear rate of permeation to rock core, calculate sealing ratiod with the changing conditions along with the time, experimental result as shown in Figure 5.Experimental result shows: through the observation of 60 days, size and the Strength Changes of the flocculation system of tool plug cuvette cartridge were little; Sealing ratiod to rock core is stabilized in 87%, illustrates that flocculation system has thermal stability preferably.The oil displacement experiment of embodiment 9, residual polymer in formation recycling adjusting driving agnet
Adopt three layers of heterogeneous core model evaluation to inject the recycling adjusting driving agnet and compare the ability that improves recovery ratio with polymer flooding.The rock core size of three layers of heterogeneous core: wide * high * long: 4.5cm * 4.5cm * 30cm, the anti-rhythm is placed, and experiment condition sees Table 3.
Concrete experimental procedure: 1. No. 1, recovery of core, vacuumizes saturation water, records volume of voids; 2. rock core saturated oil, and under formation condition aging 72h; 3. water drive, water ratio reaches 70% to the production fluid; 4. inject the polymers soln of 0.30PV; 5. turn water drive, water ratio reaches 95% to the production fluid, calculates recovery ratio E
16. No. 2, recovery of core, and above repeating step, step 1.～4.; 7. then cross the displacing liquid that replaces 0.05PV, inject the residual polymer in formation recycling adjusting driving agnet of 0.30PV; 8. metaideophone water, water drive water ratio to the production fluid reaches 95%, calculates recovery ratio E
2The experimental result that different flooding systems improve recovery ratio is as shown in table 3.
As can be seen from Table 3, after No. 1 the rock core injection of polymer turned water drive, water-cut increase was very fast; When water ratio reached 95%, recovery ratio was about 50.93%.Its reason is that residual polymer in formation can not be controlled effective passage, can not play the effect of good raising sweep efficiency.For No. 2 rock cores, after injecting reuse agent after polymer flooding, when water ratio reached 95%, recovery ratio reached 61.53% left and right, and during than polymer flooding, recovery ratio has increased by 10.40%.This is that the recycling adjusting driving agnet is adsorbed on the stratum sandstone surface, has increased resistance to flow, produces certain oil-displacement capacity because significantly decrease at the process water ratio that injects the recycling adjusting driving agnet on the one hand; Recycle on the other hand adjusting driving agnet and produce flocs unit with the polymkeric substance that remains in most permeable zone by throwing out, controlled the most permeable zone that polymer flooding produces, started the crude oil of middle low permeability layer, follow-up turning in the water drive oil displacement process, water-cut increase is slower, and the recovery percent of reserves of middle low permeability layer is increased substantially.
The different flooding systems of table 3 improve the contrast of recovery ratio ability
Claims (8)
1. a residual polymer in formation recycles adjusting driving agnet, it is characterized in that raw materials quality is than composed as follows:
Water medium decentralized polyacrylamide 0.8～2.0%,
The local water surplus;
Described water medium decentralized polyacrylamide is selected from one of water-in-water type cation emulsion WF20, water-in-water type cation emulsion WF40, water-in-water type cation emulsion WF70 or combination.
2. residual polymer in formation recycling adjusting driving agnet according to claim 1, is characterized in that described water medium decentralized polyacrylamide is water-in-water type cation emulsion WF40.
3. residual polymer in formation according to claim 1 recycles adjusting driving agnet, it is characterized in that described water medium decentralized polyacrylamide is water-in-water type cation emulsion WF40, by mass percentage, solid content is 46.3%～48.2%, effective content is 18%～20%, and relative molecular mass is 750 * 10
4～800 * 10
4, cationic degree is 38～41.
4. residual polymer in formation recycling adjusting driving agnet according to claim 1, is characterized in that described local water is to contain Na
+, Ca
2+, Mg
2+, SO
4 2 –, HCO
3 – andCl
–Deionized water, wherein, described Na
+Concentration be 950.89mgL
-1, Ca
2++ Mg
2+Concentration is 30.61mgL
-1, CO
3 2-Concentration be 107.14mgL
-1, SO
4 2 –Concentration be 43.62mgL
-1, HCO
3 –Concentration be 924.45mgL
-1, Cl
–Concentration be 845.52mgL
-1
5. residual polymer in formation according to claim 4 recycles adjusting driving agnet, and the preparation that it is characterized in that described local water is by Na
+, Ca
2+, Mg
2+, SO
4 2 –, CO
3 2-, HCO
3 –And Cl
–Concentration is respectively with CaCl
2, MgCl
26H
2O, Na
2SO
4, NaCO
3, NaHCO
3, NaCl joins in deionized water.
6. the application of arbitrary described residual polymer in formation recycling adjusting driving agnet in the recovery ratio that improves the offshore oilfield polymer flooding in claim 1～5.
7. application according to claim 6, is characterized in that, the polymkeric substance that described polymer flooding adopts is partially hydrolyzed polyacrylamide (BHPM), and solid content is 88.5%～89.7%, and relative molecular mass is 2000 * 10
4～2200 * 10
4, degree of hydrolysis is 24.2%～25.0%.
8. application according to claim 6, is characterized in that, using method is as follows:
Described residual polymer in formation recycling adjusting driving agnet is added in water injection well, is injected into by water injection well in the oil reservoir in target oil field, interact with wherein residual anionic polymer, carry out the deep transfer drive, the raising oil recovery factor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107629773A (en) * | 2017-10-25 | 2018-01-26 | 中国石油化工股份有限公司 | Told or plugging agent and preparation method thereof prepared by output polymer using returning |
| CN114316130A (en) * | 2021-12-27 | 2022-04-12 | 爱森（中国）絮凝剂有限公司 | Method for utilizing byproduct sodium chloride of industrial production of dimethyl diallyl ammonium chloride in cationic emulsion |
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| CN114316130A (en) * | 2021-12-27 | 2022-04-12 | 爱森（中国）絮凝剂有限公司 | Method for utilizing byproduct sodium chloride of industrial production of dimethyl diallyl ammonium chloride in cationic emulsion |
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