CN104109521B - A kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir - Google Patents
A kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir Download PDFInfo
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Abstract
The invention discloses a kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir, belong to oil field development technical field of tertiary oil recovery.The oil displacement system is mainly made up of the component of following concentration：Partially hydrolyzed polyacrylamide (PHPA)（HPAM）800~1800mg/L, organic 30~300mg/L of phenolic crosslinkers, partially hydrolyzed polyacrylamide (PHPA) and the concentration ratio ＞ 6 of organic phenolic crosslinkers.The present invention has the characteristics of viscosity is high, long-time stability are good, injection efficiency is good for the weak crosslinked polymer in PC oil displacement system of high-temperature oil reservoir, is 80~95 DEG C using reservoir temperature scope, solves the problem that chemical flooding technology can not be applied in high-temperature oil reservoir；The oil displacement system is applied in comprehensive water cut 98.7%, 93.7 DEG C of series of strata of high-temperature oil reservoir VII 13 of recovery percent of reserves 42.1% has significant oil increasing precipitation effect.
Description
Technical field
Present invention relates particularly to a kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir, belong to oil field development three
Secondary oil recovery technique field.
Background technology
Chemical flooding technology is to improve the effective technical way of Eastern China old filed waterflooding development deficiency in economic performance.Chemical flooding
Technology has all carried out large-scale industrialization application in Daqing oil field, Shengli Oil Field, Henan Oil Field etc., and acquirement obviously increases
Oily dewatering effect, it is increasing using scale.But when reservoir temperature is higher than 60 DEG C, polymer is migrated in oil reservoir, can be sent out
Raw obvious chemical degradation effect, particularly oxygen present in injection of polymer solution can produce the oxygen of free radical state, make
Polymer produces free radical degradation reaction, causes polymer molecular weight to be greatly reduced, polymer solution viscosity significantly declines
（I.e. thermal-oxidative degradation is acted on）, so that the displacement of reservoir oil effect of polymer solution is deteriorated.
In order to solve the stability problem that polymer solution is migrated in oil reservoir, expert have studied many technological approaches as gathered
Polymer solution control oxygen technology, synthesizing new polymer technology, addition stabilizer technology etc..Stable polymer technology more than using with
Afterwards, the stability of polymer solution is improved, and the application of technique of polymer flooding rises to 80 DEG C of oil reservoirs by 50 DEG C of oil reservoirs.Shengli Oil
Field, the reservoir temperature of Henan Oil Field technique of polymer flooding industrial applications have reached 80 DEG C, and this is domestic technique of polymer flooding
Industrial applications highest reservoir temperature.
The oil reservoir that China is more than 80 DEG C is a lot, and the crude oil reserve of more than 80 DEG C oil reservoirs accounts for 50% or so of total crude oil reserve, attacks
Close this part oil reservoir and increase substantially recovery efficiency technique, crude oil in China is produced and the long-run development of oilfield enterprise is particularly significant.
But reservoir temperature is more than after 80 DEG C, at particularly more than 90 DEG C, the thermal-oxidative degradation effect of polymer is more obvious, and this is also
Domestic chemical flooding technology can not apply the main cause of the oil reservoir more than 80 DEG C.
The content of the invention
It is an object of the invention to provide a kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir.
In order to realize the above object the technical solution adopted in the present invention is：
A kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir, is mainly made up of the component of following concentration：Portion
Point 800~1800mg/L of hydrolyzed polyacrylamide, organic 30~300mg/L of phenolic crosslinkers, partially hydrolyzed polyacrylamide (PHPA) with
The concentration ratio ＞ 6 of organic phenolic crosslinkers.
It is preferred that, a kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir, mainly by the component of following concentration
Composition：Partially hydrolyzed polyacrylamide (PHPA) 1500mg/L, organic phenolic crosslinkers 120mg/L, partially hydrolyzed polyacrylamide (PHPA) is with having
The concentration ratio ＞ 6 of machine phenolic crosslinkers.
Described partially hydrolyzed polyacrylamide (PHPA)（HPAM）For 1630S type polymer, degree of hydrolysis 19.4%, molecular weight 1966
Ten thousand, containing stabilizer, provided by French SNF companies.
Described organic phenolic crosslinkers are HN1 type crosslinking agents, and phenyl ring is 2~4, and active group is more than 5, by river
Southern oil field Fei Ya companies provide.
Beneficial effects of the present invention：
It is used for the weak crosslinked polymer in PC oil displacement system of high-temperature oil reservoir in the present invention, it is good with viscosity height, long-time stability,
The characteristics of injection efficiency is good, is 80~95 DEG C using reservoir temperature scope, solving chemical flooding technology can not be in high-temperature oil reservoir
The problem of application.The present invention uses the Lower degrees of hydrolysis polymer 1630S containing stabilizer, can be carried on the basis of tackifying is good
The high-temperature stability of high polymer；Cross-linking reaction ability is strong under the high temperature conditions by organic phenolic crosslinkers HN1, by intermolecular
Cross-linking reaction increases polymer molecular weight, is the back reaction of depolymerization reaction, and the raising of cross-linking reaction by a larger margin gathers
The high-temperature stability of compound；1630S and HN1 concentration ratio ＞ 6 is controlled simultaneously, it is ensured that cross-linking reaction degree is low, it is impossible to generate net
Shape structure, the property noted when making weak crosslinked polymer in PC system that there is good mobility and field application.Polymer 1630S and
Crosslinking agent HN1 is used in conjunction with, and weak crosslinked polymer in PC system can be kept to possess long-term viscosity stabilization in oil reservoir migration process
Property, reduction mobility ratio expansion swept volume, its amplitude for improving recovery ratio is more than single polymers solution.
The 93.7 DEG C of high temperature of weak crosslinked polymer in PC oil displacement system in the present invention in aqueous 98.7%, recovery percent of reserves 42.1%
The 1-3 series of strata applications of oil reservoir VII, day oil-producing increase to the 30.4t/d on peak by 11.8t/d, oil-producing multiple 2.5 adds up to increase oil 2.12
Ten thousand tons.
Brief description of the drawings
Fig. 1 is applied to VII 1-3 series of strata center oil well G22 wells for weak crosslinked polymer in PC oil displacement system in the embodiment of the present invention
Production development curve；
Fig. 2 is Production development curve of the weak crosslinked polymer in PC oil displacement system applied to VII 1-3 series of strata blocks in embodiment.
Embodiment
Following embodiments are only described in further detail to the present invention, but do not constitute any limitation of the invention.
First, embodiment
Using the 1-3 series of strata of Shuan He oil fields VII as target reservoir, as weak crosslinked polymer in PC oil displacement system in high-temperature oil reservoir
Embodiment.
The basic situation of target reservoir：The 1-3 series of strata oil areas 9.15km of Shuan He oil fields VII2, oil in place 784.0 ×
104T, oil reservoir depth is 1996m, porosity 18.0%, 0.587 μm of permeability2, underground crude oil viscosity 2.3mPas, formation temperature
93.7 DEG C, stratum water is NaHCO3Type, salinity is 13087mg/L.Recovery percent of reserves 42.1%, comprehensive water cut 98.7%.
The 1-3 series of strata of Shuan He oil fields VII belong to high temperature, high recovery percent of reserves and ultra-high water cut reservoir, and water flooding effectiveness is poor, need
Technology improving ecology development effectiveness is driven using weak crosslinked polymer in PC.
The present embodiment uses Five-point method pattern, and 5 mouthfuls of injection wells, 11 mouthfuls of producing wells, notes adopt average well spacing in 220m.Application
Weak crosslinked polymer in PC oil displacement system is 1500mg/L polymer 1630S, 120mg/L crosslinking agents HN1.Current note 5 years
0.60PV。
It is used for the preparation method of the weak crosslinked polymer in PC oil displacement system of high-temperature oil reservoir, including following step in the present embodiment
Suddenly：（1）Polymer 1630S is made into 4000mg/L mother liquors in injection station, crosslinking agent HN1 contents 20% are stored in 150m respectively3
Big tank is standby.（2）Two kinds of mother liquors are accurately measured by injection pump by injection high-pressure sewage pipeline and are mixed to form low cross-linking polymerization
Thing oil displacement system.（3）Weak crosslinked polymer in PC oil displacement system is further well mixed by static mixer, each is then injected into
Injection well.
Effect of field application of the weak crosslinked polymer in PC oil displacement system in the 1-3 series of strata of Shuan He oil fields VII：
1st, the live gel-forming property of weak crosslinked polymer in PC oil displacement system is good
Weak crosslinked polymer in PC oil displacement system（1500mg/L polymer 1630S+120mg/L crosslinking agents HN1）It is high at 94 DEG C
The lower gelation time of temperature 7~10 days, well head plastic rate >=95%, into 60~230mPa.s of adhesiveness.Illustrate weak crosslinked polymer in PC
System scene gel-forming property is good, controllable into adhesiveness.
2nd, injection pressure steadily rises
Crosslinked polymer oil-displacing system 0.60PV is injected, the day fluence of 5 mouthfuls of injection wells is stable in 500m3/ d, injects pressure
18MPa, injection pressure rise 6.5MPa are risen to by 11.5MPa.Pressure rises steadily in whole injection process, does not note
Enter the situation of pressure decline.This explanation, the existing good mobility of weak crosslinked polymer in PC oil displacement system and live injection, again
There is good heat resistance, gel-forming property of being migrated in oil reservoir is good, viscosity retains good, establishes underground percolation resistance.
3rd, intake profile is improved
The intake profile of pilot test area injection well is obviously improved, and strong water-intake interval blocked or suppressed, not water-intake interval
Reduced with strong water-intake interval and thickness；Medium water-intake interval and thickness substantially increase；Substantially start and do not absorb water and weak water accepting layer
Section；Main force's substratum VII 2 and VII 3 layers of water suction become than more uniform.
4th, center oil well G22 wells oil increasing precipitation effect is obvious
Fig. 1 is that VII 1-3 series of strata weak crosslinked polymer in PC system applies center oil well G22 well Production development curves.It can see
Go out, centerwell G22 well oil increasing precipitations effect substantially, day oil-producing from 0.5t/d rise peak period 11.5t/d, it is aqueous by 98.3%
It is minimum to drop to 90.6%.
5th, the Production development curve of weak crosslinked polymer in PC system application block
Fig. 2 is the Production development curve of VII 1-3 series of strata weak crosslinked polymer in PC system application blocks.As can be seen that block
Overall oil increasing precipitation effect substantially, day oil-producing increase to the 30.4t/d of peak period by 11.8t/d, it is aqueous to be dropped to by 98.4%
95.4%；It is accumulative to increase 2.12 ten thousand t of oil.Current block increases, the good life of aqueous decline still in peak period of taking effect in oil production
Production trend.
It must be noted that the reservoir temperature of technique of polymer flooding application can only achieve 80 DEG C, prepared by cross-linking reaction
Oil reservoir application success of the weak crosslinked polymer in PC oil displacement system at 93.7 DEG C.Therefore acted synergistically between polymer and crosslinking agent
Result, increase substantially the temperature-resistant anti-salt ability of polymer, the reservoir temperature that polymer is applied brings up to 93.7 from 80 DEG C
DEG C, the application of polymer is greatly expanded, with great economic benefit.
2nd, experimental example
The preparation method of weak crosslinked polymer in PC oil displacement system：（1）A certain amount of polymer powder 1630S is weighed, plus
Enter to rivers oil field and inject sewage（Table 1）In, stirred 2 hours under conditions of 300 turns/min, be made into 4000mg/L polymer female
Liquid, it is standby after placing 24 hours.（2）A certain amount of rivers oil field injection sewage is weighed, the crosslinking agent HN1 of precise is added,
Stirred under conditions of 300 turns/min；Then the polymer mother liquor of precise is added, is stirred under conditions of 300 turns/min
Mix 2 hours, that is, be prepared into the weak crosslinked polymer in PC oil displacement system needed for experiment.
The rivers oilfield injection water ion component (mg/L) of table 1
| Na++K+ | Mg2++Ca2+ | Cl- | SO4 2- | CO3 2- | HCO3 - | TDS | pH | Water type |
| 2485 | 48 | 3114 | 1798 | 0 | 1285 | 8730 | 8.6 | NaHCO3 |
1st, organic phenolic crosslinkers HN1
Synthesized under certain condition with phenols and aldehyde material, phenyl ring control at 2~4, active group control 5 with
On, organic phenolic crosslinkers HN1 of field application is generated, the effective content of industrial products is 20%, by Henan Oil Field Fei Ya companies
Production.
2nd, polymer 1630S
（1）Polymer 1630S glues dense relation
1630S polymer is partially hydrolyzed polyacrylamide (PHPA)（HPAM）, degree of hydrolysis 19.4%, molecular weight 19,660,000, containing steady
Determine agent, produced by French SNF companies, thickening property is good（Table 2）.
The viscous dense relation of the 1630S solution of table 2（95 DEG C, 6r/min）
| Concentration（mg/L） | 500 | 800 | 1000 | 1200 | 1500 | 1800 | 2000 | 2500 | 3000 |
| Viscosity（mPa·s） | 2.8 | 6.9 | 10.8 | 16.2 | 23.8 | 36.8 | 44.9 | 70.8 | 95.3 |
（2）Polymer 1630S solution long-term thermal stabilities
1500mg/L polymer 1630S solution long-time stability are as shown in table 3.95 DEG C of the 1630S solution viscosity of aging 180 days
Drop to 19.5mPa.s from 23.8mPa.s, viscosity retention ratio is 81.9%.
The ageing time of table 3 is to 1500mg/L1630S solution viscosities（mPa.s）Influence（95℃）
| Ageing time（d） | 0 | 1 | 5 | 15 | 30 | 45 | 60 | 90 | 120 | 180 |
| Viscosity（mPa.s） | 23.8 | 37.5 | 40.1 | 35.5 | 36.2 | 35.2 | 34.5 | 29.7 | 25.5 | 19.5 |
（3）The resistance coefficient and residual resistance factor of polymer
It it is 0.46-1.38 μm in permeability2Rock core on, 1500mg/L1630s polymer solutions produce resistance coefficient
For 20.4~32.1, residual resistance factor is 1.85~4.23；Resistance coefficient and residual resistance factor increase with core permeability
It is high and reduce（Table 4）.
The resistance coefficient and residual resistance factor of the polymer of table 4
3rd, the technical area of cross-linking polymer system is divided
Cross-linking polymer system is very wide in the scope that Oil Field is applied, and both may be used as profile control agent, is also used as driving
Finish.According to the formula and performance characteristic of cross-linking polymer system, cross-linking polymer system is divided into highly cross-linked polymer
System, moderate crosslinked polymer oil-displacing system and weak crosslinked polymer in PC oil displacement system（Table 5）.The present invention is low cross-linking polymerization
Thing oil displacement system, in process for preparation control 1630S and HN1 concentration ratio ＞ 6, it is ensured that oil reservoir migration in low reaction degree,
Low crosslinking degree, it is impossible to generate network structure, makes weak crosslinked polymer in PC system both have good heat resistance, has again good
Mobility and field application when the property noted.
The technical area of the cross-linking polymer system of table 5 is divided
4th, weak crosslinked polymer in PC oil displacement system formula and long-time stability
The aging under the conditions of 95 DEG C, determine different ageing times to weak crosslinked polymer in PC oil displacement system into adhesiveness shadow
Ring（Table 6）.As can be seen that as 800~1800mg/L of polymer concentration, 30~300mg/L of crosslinker concentration, 95 DEG C of high temperature bars
Aging 120 days under part, the viscosity of cross-linking system substantially rises, and viscosity is between 170m~796mPas.Weak crosslinked polymer in PC
The viscosity of oil displacement system is higher than polymer 1630S, and long-time stability are better than polymer 1630S.Used as agent is driven, formula range
For：800~1800mg/L polymer 1630S, 80~200mg/L crosslinking agents HN1,1630S and HN1 concentration ratio are controlled in ＞ 6
Scope.
The viscosity of the weak crosslinked polymer in PC oil displacement system of table 6（mPa.s）With the relation of ageing time
5th, the resistance coefficient and residual resistance factor of weak crosslinked polymer in PC oil displacement system
The resistance coefficient and residual resistance factor of weak crosslinked polymer in PC oil displacement system are as shown in table 7.It is in permeability
0.28~1.35 μm2Rock core in, weak crosslinked polymer in PC oil displacement system（800~1500mg/L1630S+80~150mg/
LHN1）Resistance coefficient be 16~38, residual resistance factor is 2.7~5.7.
Compared with polymer resistance coefficient and residual resistance factor shown in table 4, weak crosslinked polymer in PC oil displacement system
Resistance coefficient is close with polymer resistance coefficient, residual resistance factor be more than polymer residual resistance factor.This explanation is low
The injection of crosslinked polymer oil-displacing system is close with polymer, residual resistance factor is high during sequent water flooding, the term of validity is longer.
The resistance coefficient and residual resistance factor of the weak crosslinked polymer in PC oil displacement system of table 7
6th, different core model chemical flooding core oil-displacement tests
（1）Homogeneous long core chemical flooding core oil-displacement test
Homogeneous long core（4.5 × 4.5 × 30cm, 600md）Oil displacement experiment result is as shown in table 8.Under the conditions of 0.60PV,
Weak crosslinked polymer in PC oil displacement system improves recovery ratio 17.32%, than 15.87% high 1.48 percentage of enhancing oil recovery in polymer flooding
Point（Table 8）.
The artificial long core chemical flooding oil displacement experiment of table 8
（2）Heterogeneous core oil displacement experiment in 3 times of differential layers
Using 3 times of permeability grades（300md、650md、900md）Heterogeneous long cores model in layer（4.5×4.5×
30cm）, core oil-displacement test result is as shown in table 9.Under the conditions of 0.60PV, weak crosslinked polymer in PC oil displacement system improves harvesting
Rate 16.1%, than 14.9% high 1.20 percentage point of enhancing oil recovery in polymer flooding（Table 9）.
Heterogeneous core oil displacement experiment in the 3 times of differential layers of different chemical systems of table 9
In summary, under the conditions of the 1-3 series of strata of Shuan He oil fields VII, weak crosslinked polymer in PC oil displacement system improves recovery ratio value all
Higher than polymer flooding, the result acted synergistically between polymer and crosslinking agent not only increases polymer heat resistance, also improved
Recovery ratio.
Claims (2)
1. a kind of weak crosslinked polymer in PC oil displacement system for high-temperature oil reservoir, it is characterised in that：By the component system of following concentration
Into：800~1500mg/L of partially hydrolyzed polyacrylamide (PHPA), organic 30~120mg/L of phenolic crosslinkers, partial hydrolysis polyacrylamide
Amine and the concentration ratio ＞ 6 of organic phenolic crosslinkers；
Described partially hydrolyzed polyacrylamide (PHPA) is 1630S type polymer；
Described organic phenolic crosslinkers are HN1 type crosslinking agents.
2. the weak crosslinked polymer in PC oil displacement system according to claim 1 for high-temperature oil reservoir, it is characterised in that：By with
The component of lower concentration is made：Partially hydrolyzed polyacrylamide (PHPA) 1500mg/L, organic phenolic crosslinkers 120mg/L.
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485875A (en) * | 1983-02-28 | 1984-12-04 | Marathon Oil Company | Process for selectively plugging permeable zones in a subterranean formation |
| US4974677A (en) * | 1989-10-16 | 1990-12-04 | Mobil Oil Corporation | Profile control process for use under high temperature reservoir conditions |
| CN1114659C (en) * | 2000-10-19 | 2003-07-16 | 中国科学院广州化学研究所 | Polyacrylamide microgel |
| CN100549069C (en) * | 2005-12-09 | 2009-10-14 | 中国石油天然气股份有限公司 | A kind of single speed catalysed phenolic resin gel oil-displacing agent |
| CN102559159B (en) * | 2011-12-14 | 2013-12-04 | 中国石油天然气股份有限公司 | High-temperature resistant phenolic resin weak gel profile control plugging agent |
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