CN103113873B - 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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- CN103113873B CN103113873B CN201310070242.3A CN201310070242A CN103113873B CN 103113873 B CN103113873 B CN 103113873B CN 201310070242 A CN201310070242 A CN 201310070242A CN 103113873 B CN103113873 B CN 103113873B
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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 Oil-Gas Field Development Engineering technical field.
Background technology
The exploitation of offshore oilfield is subject to the restriction of platform life span, passes through the research of nearly more than ten years polymer flooding laboratory experiment and the exploitation with field test, successfully polymer flooding is used for to Offshore Heavy Oil Field oil reservoir, and has obtained efficient output and economic benefit.But due to the formation condition of Offshore Heavy Oil Field oil reservoir harshness, along with the exploitation of oilfield polymer flooding, Reservoir Permeability is differential more becomes larger, channelling is serious, the well of being imitated of increasing polymer flooding occurs that output polymer concentration is too high, 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 stratum in the mode of absorption and trapping, does not bring into play the effect of the displacement of reservoir oil, causes environmental pollution from 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 not 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 current note gathers.
At present because land maturing field mostly enters high water-cut stage, the further investigation such as Zhao Fulin, Dai Caili proposes 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 in residual polymer in formation reutilization technology, be most widely used is flocculation technique, preferably flocculation agent is stabilization sodium soil YG340-1, it is mainly made up of inorganic bentonite and stablizer, there is excellent property, the advantage such as cheap, but after polymer flooding, inject stabilization sodium soil YG340-1 and may have the risk of stopping up non-object 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 operation of onshore oil field polymer flooding is used the Main Morphology of polymkeric substance, and its swelling stage is longer, and dissolution rate is slow, need to configure large-scale dissolving and curing equipment, takes up room large, and the use in oil field is at sea restricted.
Summary of the invention
For the deficiency that recycles 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 is mainly applicable to sea carries out the oil field of polymer flooding, it can effectively utilize polymer formation flocs unit residual in 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 using polymers soln as oil-displacing agent, belongs to chemical flooding;
Residual polymer in formation, refers to and remains in the polymkeric substance injecting as oil-displacing agent in stratum after oilfield polymer flooding;
Water-in-water type cation emulsion: acrylamide monomer (AM) carries out with other water-soluble monomer the seemingly aqueous dispersion of emulsion of outer appearnce that dispersion polymerization obtains in a kind of inorganic salt solution of low-molecular weight water-soluble polymer stablizer.About technology of preparing is referring to the master thesis " the synthetic and application of cationic polyacrylamide " water Bao Shui " emulsion " of Fu Zhijian, the master thesis " preparation of polyacrylamide water bag water copolymer emulsion " of 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%,
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.Water-in-water type cation emulsion WF40 can buy in market, 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 containing 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 by 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 as mentioned above.
The application of residual polymer in formation recycling adjusting driving agnet of the present invention in the recovery ratio that improves 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%.
When application, the adjusting driving agnet of the present invention fully having dissolved is injected to water injection well, be injected in target oil reservoir by water injection well.This adjusting driving agnet preferentially enters the stratum that rate of permeation is high, in stratum, interacts with residual polymkeric substance, forms and is difficult to mobile flocculation system, and the height of controlling polymer flooding generation 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.
Water-in-water type cation emulsion of the present invention can be bought in market, also can prepare by prior art.
Residual polymer in formation recycling adjusting driving agnet of the present invention, for the residual polymer in formation recycling after offshore oilfield polymer flooding, improves the development effectiveness of offshore oilfield polymer flooding, realizes the target that improves oil recovery factor and reduce output polymer concentration.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 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, more easily " fingering " enter most permeable zone, moving forward in process constantly and the residual polyalcohol formation flocculation system that meets, carry out shutoff most permeable zone.
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 deep transfer drive, improve oil recovery factor.
The invention has the beneficial effects as follows:
(1) the present invention is in conjunction with the feature of offshore oilfield Efficient Development and emphasis environment protection; utilize water-in-water type cation emulsion to join in recycling transfer drive system; there is the breakthrough of polymers soln in stratum and the ability of raising sweep efficiency of delaying; it can play the effect that utilizes residual polymer in formation recycling deep transfer drive to improve oil recovery factor after 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 the scene that is highly suitable for offshore oilfield polymer flooding is used.Inject residual polymer in formation recycling adjusting driving agnet by the water injection well in polymer flooding process and in follow-up water drive, interact and form the flocculation system with sealing characteristics with the residual polyalcohol 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 oil-gas field development field at sea.
Accompanying drawing explanation
Fig. 1 is the variation relation curves of embodiment 2 residual polymer in formation recycling adjusting driving agnet viscosity with churning time
Fig. 2 is the variation relation curves of embodiment 3 residual polymer in formation recycling adjusting driving agnet viscosity with 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, a-residual polymer in formation; B-residual polymer in formation reuse agent; C-flocculation system;
Fig. 5 injects embodiment 8 to recycle fill out sand tube reservoir core plugging rate curve over time after adjusting driving agnet
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 using in following embodiment if no special instructions, is ordinary method.Material, reagent etc. used in embodiment, if no special instructions, all can obtain from commercial channels below.
The polymkeric substance that oil field in embodiment is used is 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 accounts for the ratio of the cubic capacity of formation 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 containing 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 by 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 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, the recycling adjusting driving agnet solution that preparation quality concentration is 1.5%.Under the rotating speed of 400r/min, constant speed stirs, and samples once, at 20 ℃ and 7.34s every 2min
-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 moment is the dissolution time under this shearing rate.The viscosity of solution with the relation of churning time as shown in Figure 1.
Experimental result shows, water-in-water type cation emulsion has good solubility property, and the dissolution time in the time of 20 ℃ is 6～10min.This is because water-in-water type cation emulsion is compared with HPAM dry powder, the specific surface of particle is much larger, and there is part swelling in its polymerization process of preparing, in the time that 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 sticky 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% object liquid, at 20 ℃ and 7.34s
-under 1 condition, with the viscosity number of Brookfield viscometer determining solution, the results are shown in Figure 2.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 in the time that mass concentration is 1.5%, viscosity is 22.4mPas, and this explanation has good injection.
The sticky 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 residual polymer in formation recycling adjusting driving agnet enters from ground the injection process of earth formation deep, viscosity reduces gradually, has good mobility, can enter in most permeable zone and meet with the residual polymer in formation being detained and dissolve, there is flocculation reaction, 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, is then diluted to mass concentration and is 0.5%, 1.0%, 1.5%, 2.0% object liquid a.The polymer anion partially hydrolyzed polyacrylamide BHPM that takes the use of 0.5g oil field joins in the injected water of 99.5g stratum, is mixed with the mother liquor that mass concentration is 5000mg/L, under reservoir temperature (57 ℃) condition, places 6～8 hours; Then being diluted to mass concentration is the object liquid b of 200mg/L, 400mg/L and 800mg/L.Object liquid a after dilution and object liquid b are sheared 20 seconds with 1 grade, Warning agitator before flocculating experiment, simulate this recycling adjusting driving agnet and polymers soln and inject flow process and shaft bottom through ground and cross the state after the intense mechanical of borehole is sheared.
1. positively charged ion quality is certain
(object liquid a) to measure 5.0mL mass concentration and be 1.0% recycling adjusting driving agnet, (object liquid b) to drip wherein mass concentration and be the anionic polymer solution of 600mg/L, stir until flocculation volume no longer increases on dropping limit, limit, record drips anionic polymer solution, and (object liquid cumulative volume b), result is as table 1.
2. negatively charged ion quality is certain
(object liquid b) to measure 5.0mL mass concentration and be the anionic polymer solution of 200mg/L, 400mg/L and 800mg/L, the recycling adjusting driving agnet that concentration is 1.5% is stirred on dropping limit, limit, and (object liquid a), until flocculation volume no longer increases, record drips recycling adjusting driving agnet solution, and (object 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 (object liquid a) with stratum in residual anionic polymer BHPM(object liquid b) when 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 inject the volume of " water Bao Shui " cationic polymer solution on stratum be inject stratum polymkeric substance volume 1/3 time, simultaneously when the mass concentration of polymkeric substance in stratum is 200mg/L～800mg/L, in the time of both complete reactions, 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 the factor of cost, the mass concentration of preferred residual polymer in formation recycling adjusting driving agnet is 0.80%～2.0% simultaneously.
According to best yin, yang mass of ion ratio in table 1, measuring 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 after concussion, put into constant temperature 10min under reservoir temperature (57 ℃) condition, observe flocculation reaction, the flocculation system finally forming 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, form comparatively fine and close flocculation system with the anionic group of trapping in the polymkeric substance of sandstone surface absorption and hole and the polymer surfaces that dissolves; Then in the time 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 injecting is lower, more easily " fingering " enter most permeable zone, moving forward in process constantly and the residual polyalcohol formation flocculation system that meets, carry out shutoff most permeable zone.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, the recycling adjusting driving agnet that preparation quality concentration is 1.5%.Take the polymer anion partially hydrolyzed polyacrylamide BHPM that 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, under reservoir temperature (57 ℃) condition, place 6～8 hours; Then being diluted to mass concentration is the object liquid of 200mg/L, 400mg/L and 800mg/L.Solution in experiment after dilution is all sheared and within 20 seconds, is simulated this recycling adjusting driving agnet and polymers soln and inject flow process and shaft bottom through ground and cross the state after the intense mechanical of borehole is sheared through 1 grade, Warning agitator.
The sealing characteristics that characterizes residual polymer in formation recycling adjusting driving agnet with residual resistance factor, experimental procedure comprises: 1. fill and present fill out sand tube, after water drive is stable, survey rate of permeation (k
wi); 2. first inject the anionic polymer of different mass concentration, the recycling adjusting driving agnet that rear implantation quality concentration is 1.5%; 3. in the water bath with thermostatic control of reservoir temperature (57 ℃), stablize 8h, then water drive, rate of permeation (k after pressure-stabilisation, measured
wa), k
wi/ k
wabe residual resistance factor F
rR.The fill out sand tube core diameter 2.50cm using in experiment, long 19.5～20.0cm, injecting anionic polymer is all 0.3PV with the volume of recycling adjusting driving agnet; k
wiand k
wabe respectively rock core and block up front and stifled rear water survey rate of permeation, μ m
2; Experimental 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 recycling adjusting driving agnet, rock core is had to poor plugging action; When 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 stratum is more obvious, but because the flocculation system generating has certain intensity, flocs unit can be migrated in stratum, reaches the object 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 in the water bath with thermostatic control of reservoir temperature (57 ℃), observing flocculation system, measure the stifled rear rate of permeation to rock core simultaneously, 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 good thermal stability.The oil displacement experiment of embodiment 9, residual polymer in formation recycling adjusting driving agnet
Adopt three layers of heterogeneous core model evaluations injection recycling adjusting driving agnet to improve the ability of recovery ratio compared 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 is in table 3.
Concrete experimental procedure: 1. No. 1, recovery of core, vacuumize saturation water, record volume of voids; 2. rock core saturated oil, and under formation condition aging 72h; 3. water drive, reaches 70% to water ratio in production fluid; 4. inject the polymers soln of 0.30PV; 5. turn water drive, reach 95% to water ratio in production fluid, calculate recovery ratio E
1; 6. No. 2, recovery of core, 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 to water ratio in production fluid reaches 95%, calculates recovery ratio E
2.The experimental result that different flooding systems improve recovery ratio is as shown in table 3.
As can be seen from Table 3, No. 1 rock core injection of polymer turns after water drive, and water-cut increase is very fast; In the time that water ratio reaches 95%, recovery ratio is 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 polymer flooding, inject after reuse agent, in the time that water ratio reaches 95%, recovery ratio reaches 61.53% left and right, and during than polymer flooding, recovery ratio has increased by 10.40%.This is that recycling adjusting driving agnet is adsorbed on stratum sandstone surface, has increased resistance to flow, produces certain oil-displacement capacity because significantly decrease at the process water ratio that injects 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, control the most permeable zone that polymer flooding produces, start the crude oil of middle low permeability layer, follow-up turning in 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 (3)
1. the application of residual polymer in formation recycling adjusting driving agnet in the recovery ratio that improves offshore oilfield polymer flooding, wherein,
Described residual polymer in formation recycling adjusting driving agnet raw materials quality is than composed as follows:
Water medium decentralized polyacrylamide 0.8 ~ 2.0%, local water surplus;
Described water medium decentralized polyacrylamide is water-in-water type cation emulsion WF40, 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%;
The polymkeric substance that described polymer flooding adopts is partially hydrolyzed polyacrylamide, 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%;
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 deep transfer drive, improve oil recovery factor.
2. the application of residual polymer in formation recycling adjusting driving agnet according to claim 1, is characterized in that described local water is containing Na
+, Ca
2+, Mg
2+, SO
4 2 –, CO
3 2-, HCO
3 –and Cl
–deionized water, wherein, described Na
+concentration be 950.89 mgL
-1, Ca
2++ Mg
2+concentration is 30.61 mgL
-1, CO
3 2-concentration be 107.14 mgL
-1, SO
4 2 –concentration be 43.62 mgL
-1, HCO
3 –concentration be 924.45mgL
-1, Cl
–concentration be 845.52 mgL
-1.
3. the application of residual polymer in formation recycling adjusting driving agnet according to claim 2, 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, respectively by CaCl
2, MgCl
26H
2o, Na
2sO
4, Na
2cO
3, NaHCO
3, NaCl joins in deionized water.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5134176A (en) * | 1989-10-16 | 1992-07-28 | Mobil Oil Corporation | Crosslinked polyvinyl amine copolymer gels for use under harsh reservoir conditions |
| CN101003726A (en) * | 2006-06-27 | 2007-07-25 | 中国石化股份胜利油田分公司孤岛采油厂 | Method for preparing and using shift drive agent of reversed phase latex of polyacrylamide |
| CN101058723A (en) * | 2007-04-26 | 2007-10-24 | 中国石油大学(华东) | Re-use agent for polymer after driving and injecting method thereof |
| CN102251763A (en) * | 2011-06-03 | 2011-11-23 | 中国石油天然气股份有限公司 | Composite profile control and oil displacement extraction method for thickened oil reservoir through water injection and exploitation |
-
2013
- 2013-03-05 CN CN201310070242.3A patent/CN103113873B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5134176A (en) * | 1989-10-16 | 1992-07-28 | Mobil Oil Corporation | Crosslinked polyvinyl amine copolymer gels for use under harsh reservoir conditions |
| CN101003726A (en) * | 2006-06-27 | 2007-07-25 | 中国石化股份胜利油田分公司孤岛采油厂 | Method for preparing and using shift drive agent of reversed phase latex of polyacrylamide |
| CN101058723A (en) * | 2007-04-26 | 2007-10-24 | 中国石油大学(华东) | Re-use agent for polymer after driving and injecting method thereof |
| CN102251763A (en) * | 2011-06-03 | 2011-11-23 | 中国石油天然气股份有限公司 | Composite profile control and oil displacement extraction method for thickened oil reservoir through water injection and exploitation |
Non-Patent Citations (4)
| Title |
|---|
| 冯玉军等.阳离子聚丙烯酰胺"水包水乳液"的制备及在油田污水处理中的应用.《油田化学》.2007,第24卷(第1期),42-46. |
| 孙乐等.阳离子聚丙烯酰胺水包水乳液絮凝剂.《精细化工》.2011,第29卷(第9期),904-905. |
| 阳离子聚丙烯酰胺"水包水乳液"的制备及在油田污水处理中的应用;冯玉军等;《油田化学》;20070325;第24卷(第1期);42-46 * |
| 阳离子聚丙烯酰胺水包水乳液絮凝剂;孙乐等;《精细化工》;20110930;第29卷(第9期);904-905 * |
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