CN101545368A - On-line depth profile control method for improving oil displacement effect of polymer of offshore production well - Google Patents
On-line depth profile control method for improving oil displacement effect of polymer of offshore production well Download PDFInfo
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Abstract
The invention provides an on-line depth profile control method for improving the oil displacement effect of polymer of an offshore production well. Phenolic resin crosslinker is added to form a depth profile control system in the process of polymer flooding of the offshore production well, and by adjusting the mass concentration of the phenolic resin crosslinker, time of jelly glue formation of the depth profile control system and the different depth profile control system retaining positions in an oil deposit are changed so as to block high permeability zones or large pore paths in the polymer flooding oil deposit, thereby expanding the waves and the volume of subsequently injected polymer, increasing the utility ratio of the polymer, improving the effect of development of the polymer flooding and increasing the recovery ratio of crude oil. The depth profile control system has low viscosity and favorable fluidity, can be injected into the deep part of the oil deposit; and after being frozen, enables the sequentially injected polymer to move to low permeability zone so as to play the function of deep profile and has the advantages of favorable thermal stability, long period of validity of deep profile, and the like.
Description
Technical field:
The present invention relates to further improve in the Oil-Gas Field Development Engineering technical field marine polymer flooding oil field oil recovery factor method.
Technical background:
Bohai Bay Oil polymer flooding confirmation is obtained than positive effect, but because the restriction of Bohai Bay Oil oil reservoir and ground condition is compared with onshore oil field, need further improve the supporting technology of polymer displacement of reservoir oil, improves the effect of polymer displacement of reservoir oil.Because the Bohai Bay Oil well spacing is big, oil reservoir is thick, the number of plies is many, non-homogeneity is serious, polymer solution is scurried into oil well along high permeability zone, cause sweep efficiency not high, thereby reduced the development effectiveness of polymer flooding, to fundamentally address this problem, just must adopt the way of profile control and water plugging to improve intake profile, improve the water drive sweep efficiency.Conventional profile control has its limitation, its reason: after shutoff was repeatedly repeated in the near wellbore zone, oil saturation reduced greatly, needs the deep profile controlling blocking technology especially, carries out the deep and taps the latent power; For thick oil pay, common shallow stifled shallow accent can't satisfy the needs that improve the water drive sweep efficiency, can only cause the fluid diversion of the near wellbore zone of short-term; For conventional cross-linked polymer profile control, owing to characteristics such as gelation time are short, and gel strength is big, the shutoff of only suitable near wellbore zone, period of validity is short.
Onshore oil field research is at present also used following a few class deep profile controlling technology:
(1) clay flocculating system deep profile controlling technology
Clay flocculating system deep profile controlling technology has been a practicality technology of Petroleum Univ. (East China) and Shengli Oil Field joint research since the nineties.Main way is that sodium bentonite is mixed with suspension, utilize the swell soil aquation after particle can form flocculation system with polymer, produce at stratum pore throat place and stop up, play the effect of profile control.This technology has obtained large-scale application at Shengli Oil Field, has also obtained remarkable economic efficiency.Although this technology has obtained success, also there is its limitation, be in particular in: the natural selection of a. profile control agent is relatively poor; B. site operation needs special equipment, otherwise the preparation difficulty, labour intensity is big; C. injection is relatively poor, and heavy dose of the injection is restricted.
(2) foam deep profile controlling technology
The mechanism of action of foam deep profile controlling is that foam is when passing through formation pore, deformation takes place in the liquid pearl of foam, and liquid flow is produced resistance, it is Jamin effect, this resistance can superpose, thereby target zone is stopped up, change the water-front advance velocity and the water absorption of main water (flow) direction, improve the swept volume that injects water.At present, the foam that uses in profile control mainly is binary composite foam, ternary composite foam, steam bubble, frozen glue foam.The advantage of such profile control agent is that selectivity is strong; Shortcoming is that period of validity is short, the construction technology complexity.
(3) the weak frozen glue deep profile controlling technology of cross-linked polymer
Weak frozen glue mainly is made up of polymer and crosslinking agent two parts, exists with integral form, and cross-linked state is an intermolecular cross-linking.The weak frozen glue of cross-linked polymer is that domestic most widely used deep profile controlling improves water driving technology at present, but the factor that influences its performance is many, with strong points, and not anti-salt how, be not suitable for generally that salinity 100000mg/L is above, the deep profile controlling operation of the low permeability formation of temperature more than 90 ℃.Answer emphasis to consider the compatibility of cross-linking polymer system and formation fluid, dosing water, reservoir temperature and reservoir formation feature during application.
(4) colloidal state is disperseed frozen glue transfer drive technology
It is the intramolecular crosslinking frozen glue system of the non-network structure of polymer and crosslinking agent formation that colloidal state is disperseed frozen glue (CDG), and cross-linking reaction mainly occurs between intramolecular each crosslinking active point, based on intramolecular crosslinking, forms a frozen glue ball of string that disperses.Because CDG heat-resistant salt-resistant poor performance becomes adhesive tape part harshness, the shutoff degree is low, this Study on Technology and application all almost is in halted state both at home and abroad at present.
(5) volume expansion grain deep profile controlling technology
The volume expansion grain profile control is a kind of novel deep profile controlling technology that developed recently gets up, and mainly is strong at non-homogeneity, high moisture, oil field deep profile control that macropore is grown, improves the water drive development effectiveness and the innovative technology researched and developed.Volume expansion grain is met the constant and swollen deliquescing of water-absorbing body (but not dissolving) of oil volume, can deform under external force and migrate to earth formation deep, in high permeability formation or macropore, produce flow resistance, follow-up injection moisture flow is turned to, effectively change the earth formation deep long-period water drive and form the pressure field and the streamline field of set, reach the realization deep profile controlling, improve swept volume, improve the purpose of water drive development effectiveness, moisture at height at present, effect in the macropore oil field deep profile control is approved that extensively it is moisture to become China's height, high recovery percent of reserves oil field is carried out the deep and is taped the latent power, realize the important technical of stable yields.
(6) oily sludge deep profile controlling technology
Oily sludge is the industrial refuse of association in the dehydration of crude oil processing procedure, and main component is water, shale, colloidal bitumen and wax.As profile control agent, to compare with other chemical profile control agent, oily sludge has good anti-salt, high temperature resistance, anti-shear performance, is convenient to heavy dose of profile control squeeze note, is the blocking agent that a kind of price is low, profile control effect is good.This technology be applicable to vertically go up permeability contrast big, high water-intake interval, water injection well that starting pressure is low arranged.In Jiang-Han Area, oil field The field such as triumph Laohekou, the Liaohe River, Henan, long celebrating have all obtained good effect, but be subjected to the places of origin of raw materials, production restriction, injection efficiency is difficult in other oil field popularization.
(7) microorganism deep profile controlling technology
Microorganism is used for the water injection well profile control and starts from the U.S. the earliest, and the bacterium that can produce biopolymer is injected the stratum, after free bacterium is attracted to surface, rock duct in the stratum, begins to form the flora that adheres to; Along with the input of nutrient solution, bacterial cell is bred in a large number at height infiltration band, and the somatic cells of breeding and bacteriogenic biopolymer etc. are attached on the porous rocks surface, form the cenobium of larger volume; Follow-up abundance organic and the inorganic nutrients thing is supplied with, and the biopolymer of bacterium and metabolism output thereof is sharply expanded, and it is many more that big more bacterium of hole and nutrients gather hold-up, and the biological agglomerate of formation is big more.The a large amount of propagation of bacterium and the biopolymer of metabolism output thereof are detained the rapid gathering at position at macropore, height infiltration band is played the effect of selective shut-off preferably, reduction water absorption, make flow direction-changing increase in, hyposmosis position water absorption, involve the zone, improve oil recovery factor thereby enlarge.
(8) inorganic gel coating deep profile controlling technology
At formation temperature height (120～140 ℃), formation water salinity height (150000～210000mg/L); for the profile control and water plugging operation under the similar reservoir condition; cross-linked polymer class blocking agent is quick owing to its salt, the flocculation of temperature-sensitive and multivalent ion etc. is restricted its range of application; cement and inorganic particle or precipitation class blocking agent have heat-resistant salt-resistant performance preferably, but because of handling in its limited deep that is not suitable for of the degree of depth that enters in porous media.For this reason, Oil Exploration in China developmental research institute has proposed a kind of inorganic frozen glue coating profile control agent (WJSTP), this profile control agent and the reaction of oil reservoir highly mineralized formation brines form the inorganic gel suitable with formation water density, pass through absorbent coating, fouling forms the inorganic gel coating gradually on the rock matrix surface, make the stratum flow channel formation flow resistance that narrows down gradually, thereby formation fluid is turned to, enlarge swept volume.
(9) polymer microballoon deep profile controlling technology
Polymer microballoon deep profile controlling technology is a kind of novel deep profile controlling water-plugging technique that development in recent years is got up, and its advantage comprises that to be subjected to ectocine little, can be directly with the sewage preparation, resisting high temperature, high salt, and inject no viscosity, pollution-free, cost is lower etc.This technical role mechanism is to rely on Nano/micron level polymer microballoon water-swellable and absorption to come shutoff stratum pore throat step by step to realize the purpose of its deep profile controlling water blockoff.This technology has obtained application at Shengli Oil Field, Dagang Oilfield, Qinghai Oil Field, long celebrating oil field and Daqing oil field etc. at present, has also obtained certain economic benefits.Although this technology has obtained success, also there is its limitation, be in particular in seriously restricted by in-place permeability and degree of porosity.
(10) flexible profile control agent deep profile controlling technology
Because there are problems such as poor stability and easy fragmentation in the precrosslink volume expansion grain in field use, people such as the exploration Liu Yu of institute of PetroChina Company Limited. chapter have proposed the thinking of flexible profile control agent deep profile controlling technology.This technology changes the set streamline field of oil reservoir by means of flexible profile control agent, thereby realizes the deep fluid diversion.This flexibility profile control agent has good toughness, deformation arbitrarily, is difficult for broken fracture, the high characteristics of chemical stability.Usually to be mixed with mass fraction be 0.5 suspension to water, and purpose is to be convenient to the oil field scene storage and to inject construction.This technology has been carried out the field trial of flexible profile control agent deep profile controlling at Jilin Oil Field, Daqing oil field and Dagang Oilfield, also obtains effect preferably.
Summary of the invention:
Technical problem to be solved by this invention provides a kind of online depth profile control method that improves oil displacement effect of polymer of offshore production well.
It is on-the-spot with polymer and implantation concentration thereof according to marine polymer flooding oil field that the present invention solves the technical scheme that its technical problem takes, phenolic resin crosslinking agent by online adding different quality concentration, formation has different gelation time series deep profile controlling liquid, and utilize on-the-spot the notes to gather equipment injection earth formation deep, treat to change behind the deep profile controlling liquid gelation liquid flow path direction of follow-up polymer, further improve the recovery ratio of offshore oilfield polymer flooding.Concrete grammar is:
The concentration of injecting hydrophobic associated water-soluble polymer (AP-P4) when the scene is 1750 and/or during 2500mg/L, add phenolic resin crosslinking agent and be mixed with the deep profile controlling system, the mass concentration of phenolic resin crosslinking agent is 0.6%～4.0% in this deep profile controlling system, the gelation time of deep profile controlling system is 135～417h under reservoir temperature, and the gelation intensity of formation is 0.026～0.042MPa.
The present invention is on-the-spot with polymer and implantation concentration thereof according to offshore oilfield, the phenolic resin crosslinking agent of online adding different quality concentration, the serial deep profile controlling liquid that forms the different gelation times injects the stratum, can rest on position, the different deep of oil reservoir, has reached the purpose of deep profile controlling.
Description of drawings:
Fig. 1 breaks through the vacuum determinator.
Fig. 2 is a fill out sand tube sealing ratiod situation of change curve in the waterflood flush process.
Fig. 3 is a seepage flow pressure tester schematic flow sheet.
Fig. 4 is a pressure changing curve when injecting different aperture volume multiple.
Fig. 5 is two-tube model schematic flow sheet.
Fig. 6 is a pressure and the relation curve that injects fluid voids volume multiple in the oil displacement test.
Fig. 7 is the recovery ratio curve of high hypotonic fill out sand tube in the oil displacement test.
Fig. 8 is a moisture content and the relation curve that injects fluid voids volume multiple in the oil displacement test.
Among the figure, 1-colorimetric cylinder; 2-U type pipe; 3-rubber tube; 4-pressure meter; 5-bottle,suction; 6-constant-flux pump; 7-six-way valve; 8-polymer jar; 9-one-tenth glue jar; 10-precision pressure gauge; 11-graduated cylinder; 12-water pot; 13-valve; 14-hypotonic fill out sand tube; 15-height oozes fill out sand tube; PV is high summation of oozing pipe and hypotonic pore crack volume; I-water drive, II-polymer flooding, III-form glue is treated behind the gelation water drive again.
The specific embodiment:
Further describe the present invention below in conjunction with drawings and Examples.
1. deep profile controlling liquid gelation mechanism
Phenolic resin crosslinking agent commonly used adopts phenol or its substitute hydroquinones, resorcinol, formaldehyde or its substitute methenamine, crosslinked be based on polymer on-the-spot with hydrophobic associated water-soluble polymer (AP-P4), adopt the phenolic resin prepolymer condensation polymer as crosslinking agent, thereby reduce monomer volatilization and toxicity and then meet the environmental requirement of offshore oil field development, the phenolic resin crosslinking agent molecular structural formula is
In the phenolic resin crosslinking agent-CH
2OH by with hydrophobic associated water-soluble polymer (AP-P4) in-CONH
2Dehydration play crosslinked action, form the following frozen glue of structural formula:
2. the assay method of deep profile controlling liquid gelation time and gelation intensity
(1) assay method of gelation time
It is 65 ℃ water bath with thermostatic control that different deep profile controlling liquid samples are put into temperature, use the legal property working sample strength grade of GSC (Gel Strength Codes) of Sydansk, Level of Detail sees Table 1, and the common time that intensity is reached the G rank and remain unchanged is called the gelation time.
The visual gelation intensity rank of table 1
| The intensity code | Phenomenon |
| A | Can not detecting continuous jelly forms: identical with the viscosity of the polymer solution that does not add crosslinking agent. |
| B | High flow frozen glue: the viscosity than the same concentrations polymer solution that does not add crosslinking agent has increase slightly. |
| C | Frozen glue flows: when sample bottle was inverted, most of frozen glue flow to bottle cap. |
| D | Medium mobile frozen glue: when sample bottle vertically is inverted, have only the frozen glue of small part (15%～10%) to be not easy to flow to bottle cap (being described as being with tongue elongated frozen glue usually). |
| E | The difficult frozen glue that flows: sample bottle vertically is inverted the very slow bottle cap that flow to of frozen glue. |
| F | The mobile frozen glue of high deformation: sample bottle vertically is inverted, and frozen glue can not flow to bottle cap. |
| G | The mobile frozen glue of medium distortion: sample bottle vertically is inverted, and frozen glue is deformed into the position of half approximately downwards. |
| H | The mobile frozen glue of slight deformation: sample bottle vertically is inverted, is had only the frozen glue surface slightly to deform. |
| I | Rigidity frozen glue: when sample bottle vertically was inverted, the frozen glue surface did not deform. |
(2) assay method of gelation intensity
Use and break through vacuum standard measure mensuration gel strength, concrete grammar is: will being equipped with, the colorimetric cylinder of gelation frozen glue is linked in sequence by shown in Figure 1, start vacuum pump, maximum vacuum when measuring air breakthrough frozen glue, promptly break through vacuum, be called for short BV (breakthrough vacuum) value, that mentions in this paper is absolute value.All water corrections before using, the BV value of water is 0.007MPa, all parallel work of each sample is measured for three times, gets its average (atmospheric pressure is 0.1MPa during mensuration) then.The BV value is big more, and intensity is high more.
3. the deep profile controlling formula of liquid is optimized
At the Bohai Bay Oil condition, be based on the on-the-spot poly-concentration (being 1750mg/L and 2500mg/L at present) of annotating, with mixing water (sewage and clear water volume ratio are 3: 1) preparation hydrophobic associated polymer AP-P4 solution, studied and annotated at the scene under the poly-concentration, by adding different quality concentration phenolic resin crosslinking agent, form different deep profile controlling liquid, 65 ℃ of gelation time and gelation intensity of having investigated system, result of the test is shown in Table 2.
On-the-spot gelation time and the gelation intensity (65 ℃) of annotating variable concentrations crosslinking agent under the poly-condition of table 2
| w(AP-P4)/％ | W (phenolic resins)/% | Gelation time/h | Gelation intensity/MPa |
| 0.175 | 0.6 | 417 | 0.026 |
| 0.175 | 0.9 | 380 | 0.027 |
| 0.175 | 1.2 | 340 | 0.030 |
| 0.175 | 1.5 | 313 | 0.031 |
| 0.175 | 2.0 | 278 | 0.033 |
| 0.175 | 2.5 | 240 | 0.035 |
| 0.175 | 3.0 | 211 | 0.036 |
| 0.175 | 3.5 | 189 | 0.038 |
| 0.175 | 4.0 | 168 | 0.039 |
| 0.250 | 0.6 | 359 | 0.028 |
| 0.250 | 0.9 | 330 | 0.030 |
| 0.250 | 1.2 | 290 | 0.034 |
| 0.250 | 1.5 | 261 | 0.035 |
| 0.250 | 2.0 | 242 | 0.036 |
| 0.250 | 2.5 | 213 | 0.039 |
| 0.250 | 3.0 | 195 | 0.040 |
| 0.250 | 3.5 | 170 | 0.041 |
| 0.250 | 4.0 | 135 | 0.042 |
According to table 2 as can be known, the mass concentration by telomerized polymer and phenolic resin crosslinking agent can the different gelation time, the serial deep profile controlling formula of liquid of different gelation intensity, satisfies the requirement of on-the-spot online deep profile controlling.
4. deep profile controlling agent performance evaluation
(1) injection efficiency
The viscosity of adopted U.S. BrookField DV-viscometer determining 1750mg/L AP-P4 polymer solution and 1750mg/LAP-P4+1.5% phenolic resins deep profile controlling system, experimental result sees Table 3.
Table 3 becomes the viscosity (30 ℃) of glue
| System type | 1750mg/L AP-P4 | 1750mg/L AP-P4+1.5% phenolic resins |
| Viscosity/(mPas -1) | 44.1 | 45.2 |
Test condition: 6RPM, 7.34S
-1
As can be seen from Table 3, behind the adding phenolic resin crosslinking agent, the viscosity of deep profile controlling system changes very little in the AP-P4 polymer solution, therefore can not influence the injection efficiency of system.
(2) sealing characteristics
Under 65 ℃, investigated sealing ratiod and the residual resistance factor of two deep profile controlling systems in fill out sand tube, experimental result is as shown in table 4.
The sealing characteristics of table 4 deep profile controlling system
| Sequence number | Prescription | k wi/μm 2 | k wa/μm 2 | E/ | F | RR |
| 1 # | 0.175%AP-P4+1.5% phenolic resins | 6.71 | 0.59 | 91.21 | 11.38 | |
| 2 # | 0.175%AP-P4+1.5% phenolic resins | 4.15 | 0.28 | 93.25 | 14.82 |
Annotate: the fill out sand tube diameter is 2.5cm, and length is 19.5cm, and being injected into glue is 0.3PV; k
WiAnd k
WaBe respectively the stifled preceding and stifled back of rock core water and survey permeability, μ m
2
As shown in Table 4, behind the deep profile controlling system gelation high permeability zone there is stronger sealing characteristics, therefore better shutoff high permeability zone, the expansion sweep efficiency improves the oil displacement efficiency of polymer flooding.
(3) thermal stability
Heat stability after having investigated following deep profile controlling system gelation under 65 ℃, experimental result is as shown in table 5.
Stability behind the table 5 deep profile controlling system gelation
| The frozen glue prescription | Gelation intensity/MPa | Strength retention ratio * 10 2 (30d) |
| 0.175％APP4+1.5％YG103 | 0.031 | 92.53 |
| 0.175％APP4+2.0％YG103 | 0.033 | 93.35 |
As can be seen from Table 5, strength retention ratio is still very high after placing 30 days under 65 ℃, and therefore thermal stability is preferably arranged.
(4) abrasion resistance energy
Investigated in the table 41
#The situation of change of sealing ratiod in the waterflood flush process behind the frozen glue gelation in the fill out sand tube, it the results are shown in Figure 2.
As seen from Figure 2, the initial sealing ratiod of experiment fill out sand tube washes away the back sealing ratiod through 50PV and still is higher than 90.0% all greater than 90.0%.Hence one can see that, and not only shut-off capacity is stronger in this deep profile controlling agent, and wash away stability better.
Be based on the polymerized in-situ thing and drive implantation concentration (2500mg/L), adopt the seepage flow pressure tester to estimate the injection efficiency of deep profile controlling system, device as shown in Figure 3, pressure measurement fill out sand tube diameter 2.8cm wherein, long 40cm is with the pressure of precision pressure gauge mensuration pressure tap.During mensuration, with 1mLmin
-1Injection rate respectively continuous injection of polymer solution (0.25%AP-P4) and deep profile controlling system (0.25%AP-P4+1.5% phenolic resins), numerical value in the pressure meter in the kymogram 3, investigate the relation of PVI and pressure, experimental result as shown in Figure 4.This tests used fill out sand tube water survey permeability is 7.22 μ m
2, voids volume 70mL.
As can be seen from Figure 4, the pressure when pressure when injecting the deep profile controlling system and injection of polymer changes very little, so the injection pressure variation is little, can not influence the injection of deep profile controlling system, has guaranteed carrying out smoothly of construction.
Adopt two-tube oil displacement experiment to estimate the raising recovery ratio ability of deep profile controlling system simultaneously, in with artificial consolidated core oil displacement test, simulation be a non-homogeneity in the layer, therefore in the fill out sand tube oil displacement experiment, adopt two-tube model, the interlayer heterogeneity of simulated formation.Two-tube model is to ooze fill out sand tube simulation high permeability zone with height, hypotonic fill out sand tube simulation less permeable layer, and this is tested used fill out sand tube and is same specification: back-up sand pipe range 19.6cm, cross-sectional area are 4.91cm
2Used injection rate is 1mLmin
-1, flow process is seen Fig. 5.
High hypotonic combination has been carried out in this experiment, and the basic parameter of each fill out sand tube is as shown in table 6.As can be seen from Table 6, high low-permeability extreme difference is about 5.Oil displacement test result such as Fig. 6～Fig. 8.
The basic parameter of the back-up sand rock core of the high hypotonic combination of table 6
Annotate: PV is a voids volume, mL; V
oBe saturated oils volume, mL.
Saturated oils is the comprehensive oil sample in 36-1 oil field, Suizhong, 65 ℃ of viscosity 351.7mPas.
Fig. 6～Fig. 8 is the curve that pressure, recovery ratio and moisture content change with injection fluid voids volume multiple in the parallel two-tube oil displacement test.Test mainly comprises 3 steps: water drive, polymer flooding, form glue and treat behind the gelation water drive again.In the water drive process, inject the water of 1 times of voids volume altogether, water injection pressure raises earlier and slowly descends, hypotonic pipe moisture content is 0, and the moisture content that height oozes pipe is 100%, and to ooze the recovery ratio of pipe be 48% to height when water drive finished, hypotonic pipe recovery ratio is 0, and overall recovery factor is 20.4%.
In the polymer flooding process, the mass concentration of injecting 1 times of voids volume altogether is the polymer solution of 0.25%AP-P4.Injection pressure raises gradually and reaches stable at last, and the polymer solution minute quantity enters hypotonic pipe, and the moisture content that height oozes pipe is reduced to 80% from 100%, is elevated to 100% gradually subsequently, and promptly polymer oozes from height and displaced part oil the pipe.After polymer flooding finished, the recovery ratio that height oozes pipe was 65.5%, improved recovery ratio 17.5%, and hypotonic pipe recovery ratio only is 3.0%.
Injecting 0.3PV (high permeability zone) 0.25%AP-P4+1.5% phenolic resins deep profile controlling system, after 65 ℃ are treated gelation, recovering to raise when water injection pressure begins in the process of water drive, dropping to gradually subsequently steadily.The moisture content of hypotonic pipe increases gradually near 100%, and the moisture content that height oozes pipe is 0, illustrates that height oozes pipe by the frozen glue shutoff, and the permeability of hypotonic pipe is unaffected substantially.The recovery ratio of hypotonic pipe and moisture content all increase gradually, and after the recovery water drive finished, the recovery ratio of hypotonic pipe was 61.1%, and it is 65.5% that height oozes the pipe recovery ratio, and the ultimate recovery of high hypotonic fill out sand tube combination is 63.0%.
Claims (3)
1. online depth profile control method that improves oil displacement effect of polymer of offshore production well, be on-the-spot with polymer and implantation concentration thereof according to marine polymer flooding oil field, by online adding crosslinking agent, formation has different gelation time series deep profile controlling liquid, and utilize on-the-spot the notes to gather equipment injection earth formation deep, treat can change behind the deep profile controlling liquid gelation liquid flow path direction of follow-up polymer, further improve the recovery ratio of offshore oilfield polymer flooding, it is characterized in that realizing as follows:
Select hydrophobic associated water-soluble polymer (AP-P4) and phenolic resin crosslinking agent to form the deep profile controlling system;
The concentration of injecting hydrophobic associated water-soluble polymer (AP-P4) when the scene is 1750 and/or during 2500mg/L, add phenolic resin crosslinking agent and be mixed with the deep profile controlling system, the phenolic resin crosslinking agent mass concentration is 0.6%～4.0% in this deep profile controlling system, the gelation time of deep profile controlling system is 135h～417h under reservoir temperature, and the gelation intensity of formation is 0.026～0.042MPa.
2. the online depth profile control method that improves oil displacement effect of polymer of offshore production well according to claim 1 is characterized in that said phenolic resin crosslinking agent is a phenol, or a kind of in its substitute hydroquinones and the resorcinol.
3. the online depth profile control method that improves oil displacement effect of polymer of offshore production well according to claim 1 is characterized in that said phenolic resin crosslinking agent is a formaldehyde, or the condensation polymer of its substitute methenamine.
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| CN104679986A (en) * | 2015-01-22 | 2015-06-03 | 中国石油大学(华东) | Detection method for heterogeneous degree of polymer flooding oil deposit |
| CN104679986B (en) * | 2015-01-22 | 2016-02-24 | 中国石油大学(华东) | A kind of detection method for Polymer Flooding Reservoirs non-homogeneous degree |
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| CN104949899A (en) * | 2015-05-19 | 2015-09-30 | 重庆科技学院 | Method for measuring effective viscosity of oil displacing polymer in porous medium |
| CN105625981A (en) * | 2015-07-29 | 2016-06-01 | 中国石油化工股份有限公司 | Composite profile control method for middle-high permeability oil reservoirs |
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| CN115452681A (en) * | 2022-11-11 | 2022-12-09 | 中国石油大学(华东) | Method for determining relative permeability of reservoir oil gas |
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