CN104109521A - Low-crosslinked polymer oil displacement system used for high temperature oil reservoirs - Google Patents
Low-crosslinked polymer oil displacement system used for high temperature oil reservoirs Download PDFInfo
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
Abstract
The invention discloses a low-crosslinked polymer oil displacement system used for high temperature oil reservoirs, and belongs to the technical field of oilfield exploitation tertiary recovery. The oil displacement system is mainly composed of 800-1800mg/L of partially hydrolyzed polyacrylamide (HPAM) and 30-300mg/L of an organic phenol-aldehyde crosslinking agent, and a concentration ratio of the partially hydrolyzed polyacrylamide to the organic phenol-aldehyde crosslinking agent is greater than 6. The low-crosslinked polymer oil displacement system used for high temperature oil reservoirs has the characteristics of high viscosity, good long-term stability and good injection performance, can be applied in the oil reservoirs with the temperature of 80-95DEG C, and solves a problem that a chemical oil displacement technology cannot be applied in high temperature oil reservoirs; and the oil displacement system has substantial oil increasing and water reducing effects in 93.7DEG C high temperature oil reservoir VII1-3 bed series with the comprehensive water content of 98.7% and the recovery percentage of 42.1%.
Description
Technical field
The present invention is specifically related to a kind of weak crosslinked polymer in PC flooding system for high-temperature oil reservoir, belongs to oil-field development tertiary oil recovery technology field.
Background technology
Chemical flooding technology is to improve the effective technical way of Eastern China maturing field waterflooding development deficiency in economic performance.Chemical flooding technology has all been carried out large-scale industrialization application in Daqing oil field, Shengli Oil Field, Henan Oil Field etc., obtains very significantly oil increasing precipitation effect, and application scale is increasing.But when reservoir temperature is during higher than 60 ℃, polymkeric substance is migrated in oil reservoir, can there is obvious chemical degradation effect, the oxygen particularly existing in injection of polymer solution can produce the oxygen of free radical state, make polymkeric substance produce free radical cracking reaction, cause polymericular weight significantly to reduce, polymer solution viscosity significantly declines (instant heating oxygen Degradation), thereby makes the displacement of reservoir oil effect variation of polymers soln.
The stability problem of migrating in oil reservoir in order to solve polymers soln, expert has studied a lot of technological approaches as polymers soln control oxygen technology, synthesizing new polymer technology, interpolation stablizer technology etc.After adopting above stabilization of polymer technology, the stability of polymers soln improves, and the application of technique of polymer flooding rises to 80 ℃ of oil reservoirs by 50 ℃ of oil reservoirs.The reservoir temperature of Shengli Oil Field, Henan Oil Field technique of polymer flooding industrial applications has reached 80 ℃, and this is the highest reservoir temperature of domestic technique of polymer flooding industrial applications.
It is a lot of that China is greater than the oil reservoir of 80 ℃, and the crude oil reserve of 80 ℃ of above oil reservoirs accounts for 50% left and right of total crude oil reserve, and this part oil reservoir of tackling key problems increases substantially recovery efficiency technique, to crude oil in China produce and the long-run development of oilfield enterprise very important.But reservoir temperature is greater than after 80 ℃, in the time of particularly more than 90 ℃, the thermal-oxidative degradation effect of polymkeric substance is more obvious, and this is also the major cause that domestic chemical flooding technology can not be applied in 80 ℃ of above oil reservoirs.
Summary of the invention
The object of this invention is to provide a kind of weak crosslinked polymer in PC flooding system for high-temperature oil reservoir.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of weak crosslinked polymer in PC flooding system for high-temperature oil reservoir, mainly the component by following concentration forms: partially hydrolyzed polyacrylamide 800～1800mg/L, organic phenol aldehyde cross-linking agent 30～300mg/L, the concentration ratio > 6 of partially hydrolyzed polyacrylamide and organic phenol aldehyde cross-linking agent.
Preferably, a kind of weak crosslinked polymer in PC flooding system for high-temperature oil reservoir, mainly the component by following concentration forms: partially hydrolyzed polyacrylamide 1500mg/L, organic phenol aldehyde cross-linking agent 120mg/L, the concentration ratio > 6 of partially hydrolyzed polyacrylamide and organic phenol aldehyde cross-linking agent.
Described partially hydrolyzed polyacrylamide (HPAM) is 1630S type polymkeric substance, degree of hydrolysis 19.4%, and molecular weight 1,966 ten thousand, contains stablizer, by French SNF company, is provided.
Described organic phenol aldehyde cross-linking agent is HN1 type linking agent, and phenyl ring is 2～4, and active group, more than 5, is provided by Henan Oil Field Fei Ya company.
Beneficial effect of the present invention:
In the present invention, for the weak crosslinked polymer in PC flooding system of high-temperature oil reservoir, have that viscosity is high, permanent stability good, the feature that injection efficiency is good, application reservoir temperature scope is 80～95 ℃, having solved chemical flooding technology can not be in a difficult problem for high-temperature oil reservoir application.The present invention adopts the low in hydrolysis degree polymkeric substance 1630S that contains stablizer, can improve the high-temperature stability of polymkeric substance on the good basis of tackifying; Organic phenol aldehyde cross-linking agent HN1 crosslinking reaction ability under hot conditions is strong, by intermolecular crosslinking reaction, polymericular weight is increased, and is the reversed reaction of polymer degradation reaction, the high-temperature stability of crosslinking reaction raising polymkeric substance by a larger margin; Control the concentration ratio > 6 of 1630S and HN1 simultaneously, guarantee that crosslinking reaction degree is low, can not generate reticulated structure, the property noted while making weak crosslinked polymer in PC system there is good mobility and rig-site utilization.Polymkeric substance 1630S and linking agent HN1 are used jointly, can keep weak crosslinked polymer in PC system in oil reservoir migration process, to have long-term viscosity stability, reduce mobility ratio and expand swept volume, and its amplitude that improves recovery ratio is greater than single polymers solution.
Weak crosslinked polymer in PC flooding system in the present invention is in 93.7 ℃ of high-temperature oil reservoir VII 1-3 series of strata application moisture 98.7%, recovery percent of reserves 42.1%, and a day produce oil is increased to the 30.4t/d on peak by 11.8t/d, produce oil multiple 2.5, and accumulative total increases 2.12 ten thousand tons of oil.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention, weak crosslinked polymer in PC flooding system is applied to VII 1-3 series of strata center oil well G22 well production performance graph;
Fig. 2 is the production performance graph that in embodiment, weak crosslinked polymer in PC flooding system is applied to VII 1-3 series of strata block.
Embodiment
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
One, embodiment
The Shuan He oil field VII 1-3 series of strata of take are target reservoir, the embodiment as weak crosslinked polymer in PC flooding system in high-temperature oil reservoir.
The basic situation of target reservoir: Shuan He oil field VII 1-3 series of strata oil-bearing area 9.15km
2, geologic reserve 784.0 * 10
4t, the oil reservoir degree of depth is 1996m, porosity 18.0%, rate of permeation 0.587 μ m
2, underground viscosity of crude 2.3mPas, 93.7 ℃ of formation temperature, local water is NaHCO
3type, salinity is 13087mg/L.Recovery percent of reserves 42.1%, comprehensive water cut 98.7%.
Shuan He oil field VII 1-3 series of strata belong to high temperature, high recovery percent of reserves and ultra-high water-containing oil reservoir, and waterflooding development weak effect need to be applied the weak crosslinked polymer in PC technology of driving and improve waterflooding development effect.
The present embodiment adopts Five-point method pattern, and 5 mouthfuls of Injection Wells, 11 mouthfuls of producing wells, notes are adopted average well spacing at 220m.The weak crosslinked polymer in PC flooding system of application is 1500mg/L polymkeric substance 1630S, 120mg/L linking agent HN1.5 years 0.60PV of note at present.
In the present embodiment, for the preparation method of the weak crosslinked polymer in PC flooding system of high-temperature oil reservoir, comprise the following steps: (1) is made into 4000mg/L mother liquor at injection station polymkeric substance 1630S, linking agent HN1 content 20%, leaves respectively 150m in
3large tank is standby.(2) by injection pump, two kinds of mother liquor accurate-meterings are injected to high-pressure sewage pipeline and be mixed to form weak crosslinked polymer in PC flooding system.(3) weak crosslinked polymer in PC flooding system is further mixed by static mixer, be then injected into each Injection Well.
Weak crosslinked polymer in PC flooding system is in the effect of field application of Shuan He oil field VII 1-3 series of strata:
1, the on-the-spot gel-forming property of weak crosslinked polymer in PC flooding system is good
Weak crosslinked polymer in PC flooding system (1500mg/L polymkeric substance 1630S+120mg/L linking agent HN1) gelation time 7～10 days under 94 ℃ of high temperature, well head plastic rate >=95%, becomes adhesive capacity 60～230mPa.s.Illustrate that the on-the-spot gel-forming property of weak crosslinked polymer in PC system is good, become adhesive capacity controlled.
2, injection pressure steadily rises
Inject cross-linked polymer flooding system 0.60PV, the day fluence of 5 mouthfuls of Injection Wells is stabilized in 500m
3/ d, injection pressure rises to 18MPa by 11.5MPa, injection pressure rising 6.5MPa.In whole injection process, pressure rise is steady, does not occur the situation that injection pressure declines.This explanation, the existing good mobility of weak crosslinked polymer in PC flooding system and on-the-spot injection, have again good heat resistance, and the gel-forming property of migrating in oil reservoir is good, viscosity retains well, has set up underground percolation resistance.
3, intake profile improves
The intake profile of pilot test district Injection Well obviously improves, and strong water-intake interval is not by shutoff or inhibition, water-intake interval and strong water-intake interval and thickness reduce; Medium water-intake interval and thickness obviously increase; Obviously started and do not absorbed water and weak water-intake interval; 3 layers of water suction of main force's substratum VII 2 and VII become more even.
4, center oil well G22 well oil increasing precipitation successful
Fig. 1 is that VII 1-3 series of strata weak crosslinked polymer in PC system application center oil well G22 well is produced performance graph.Can find out, centerwell G22 well oil increasing precipitation successful, day produce oil is from the 11.5t/d of 0.5t/d rising peak period, moisturely by 98.3%, minimumly drops to 90.6%.
5, the production performance graph of weak crosslinked polymer in PC system application block
Fig. 2 is the production performance graph of VII 1-3 series of strata weak crosslinked polymer in PC system application block.Can find out, block integral oil increasing precipitation successful, a day produce oil is increased to the 30.4t/d of peak period by 11.8t/d, moisturely by 98.4%, drop to 95.4%; Accumulative total increases oil 2.12 ten thousand t.Block, still in the peak period of taking effect, is the good Production trend of oil offtake increase, moisture decline at present.
It must be noted that, the reservoir temperature of technique of polymer flooding application can only reach 80 ℃, and the weak crosslinked polymer in PC flooding system of preparing by crosslinking reaction is at the oil reservoir application success of 93.7 ℃.Therefore synergistic result between polymkeric substance and linking agent, increases substantially the temperature resistant antisalt ability of polymkeric substance, and the reservoir temperature of polymer application is brought up to 93.7 ℃ from 80 ℃, has expanded greatly the range of application of polymkeric substance, has great economic benefit.
Two, experimental example
The preparation method of weak crosslinked polymer in PC flooding system: (1) takes a certain amount of polymer powder 1630S, join rivers oil field and inject sewage (table 1), under the condition of turn 300/min, stir 2 hours, be made into 4000mg/L polymer mother liquor, place standby after 24 hours.(2) take a certain amount of rivers oil field and inject sewage, add the linking agent HN1 of accurate weighing, under the condition of turn 300/min, stir; Then the polymer mother liquor that adds accurate weighing, stirs under the condition of turn/min 2 hours 300, is prepared into the required weak crosslinked polymer in PC flooding system of experiment.
Table 1 rivers oilfield injection water ion component (mg/L)
| Na ++K + | Mg 2++Ca 2+ | Cl - | SO 4 2- | CO 3 2- | HCO 3 - | TDS | pH | Water type |
| 2485 | 48 | 3114 | 1798 | 0 | 1285 | 8730 | 8.6 | NaHCO 3 |
1, organic phenol aldehyde cross-linking agent HN1
Synthetic under certain condition with phenols and aldehyde material, phenyl ring is controlled at 2～4, and active group is controlled at more than 5, generates the organic phenol aldehyde cross-linking agent HN1 of rig-site utilization, and the effective content of Industrial products is 20%, by Henan Oil Field Fei Ya company, is produced.
2, polymkeric substance 1630S
(1) the sticky dense relation of polymkeric substance 1630S
1630S polymkeric substance is partially hydrolyzed polyacrylamide (HPAM), degree of hydrolysis 19.4%, and molecular weight 1,966 ten thousand, contains stablizer, is produced thickening property good (table 2) by French SNF company.
The sticky dense relation of table 21630S solution (95 ℃, 6r/min)
| Concentration (mg/L) | 500 | 800 | 1000 | 1200 | 1500 | 1800 | 2000 | 2500 | 3000 |
| Viscosity (mPas) | 2.8 | 6.9 | 10.8 | 16.2 | 23.8 | 36.8 | 44.9 | 70.8 | 95.3 |
(2) polymkeric substance 1630S solution long-term thermal stability
1500mg/L polymkeric substance 1630S solution permanent stability are as shown in table 3.95 ℃ of aging 180 days viscosity of 1630S solution drop to 19.5mPa.s from 23.8mPa.s, and viscosity retention ratio is 81.9%.
Table 3 digestion time is on the impact of 1500mg/L1630S soltion viscosity (mPa.s) (95 ℃)
| Digestion 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) resistance coefficient of polymkeric substance and residual resistance factor
In rate of permeation, be 0.46-1.38 μ m
2rock core on, the resistance coefficient that 1500mg/L1630s polymers soln produces is 20.4～32.1, residual resistance factor is 1.85～4.23; Resistance coefficient and residual resistance factor are along with core permeability increases and reduces (table 4).
The resistance coefficient of table 4 polymkeric substance and residual resistance factor
3, the technical area of cross-linking polymer system is divided
Cross-linking polymer system, in the wide range of Oil Field application, both can be used as amendment, also can be used as oil-displacing agent.According to the formula of cross-linking polymer system and performance characteristic, cross-linking polymer system is divided into highly cross-linked polymeric system, moderate cross-linked polymer flooding system and weak crosslinked polymer in PC flooding system (table 5).The present invention is weak crosslinked polymer in PC flooding system, in process for preparation, control the concentration ratio > 6 of 1630S and HN1, guarantee low reaction degree, low crosslinking degree in oil reservoir migration, can not generate reticulated structure, make weak crosslinked polymer in PC system both there is good heat resistance, the property noted while thering is again good mobility and rig-site utilization.
The technical area of table 5 cross-linking polymer system is divided
4, weak crosslinked polymer in PC flooding system formula and permanent stability
Aging under 95 ℃ of conditions, measure different digestion times and weak crosslinked polymer in PC flooding system is become to the impact (table 6) of adhesive capacity.Can find out, when polymer concentration 800～1800mg/L, crosslinker concentration 30～300mg/L, under 95 ℃ of hot conditionss aging 120 days, the viscosity of cross-linking system obviously rose, and viscosity is between 170m～796mPas.The viscosity of weak crosslinked polymer in PC flooding system is higher than polymkeric substance 1630S, and permanent stability are better than polymkeric substance 1630S.As driving agent, use, formula range is: 800～1800mg/L polymkeric substance 1630S, 80～200mg/L linking agent HN1, the concentration ratio of 1630S and HN1 is controlled at the scope of > 6.
The viscosity (mPa.s) of table 6 weak crosslinked polymer in PC flooding system and the relation of digestion time
5, the resistance coefficient of weak crosslinked polymer in PC flooding system and residual resistance factor
Resistance coefficient and the residual resistance factor of weak crosslinked polymer in PC flooding system are as shown in table 7.In rate of permeation, be 0.28～1.35 μ m
2rock core in, the resistance coefficient of weak crosslinked polymer in PC flooding system (800～1500mg/L1630S+80～150mg/LHN1) is 16～38, residual resistance factor is 2.7～5.7.
Compare the residual resistance factor that the resistance coefficient of weak crosslinked polymer in PC flooding system is close with polymkeric substance resistance coefficient, residual resistance factor is greater than polymkeric substance with residual resistance factor with the polymkeric substance resistance coefficient shown in table 4.During close with polymkeric substance, the follow-up water drive of injection of this explanation weak crosslinked polymer in PC flooding system, residual resistance factor is high, validity period is longer.
Resistance coefficient and the residual resistance factor of table 7 weak crosslinked polymer in PC flooding system
6, different rock core model chemistries drive rock core oil displacement experiment
(1) homogeneous long core chemical flooding rock core oil displacement experiment
Homogeneous long core (4.5 * 4.5 * 30cm, 600md) oil displacement experiment result is as shown in table 8.Under 0.60PV condition, weak crosslinked polymer in PC flooding system improves recovery ratio 17.32%, than high 1.48 percentage points (table 8) of enhancing oil recovery in polymer flooding 15.87%.
The artificial long rock core chemical flooding oil displacement experiment of table 8
Heterogeneous core oil displacement experiment in (2) 3 times of differential layers
Adopt the long rock core model of heterogeneous body (4.5 * 4.5 * 30cm) in 3 times of permeability grade (300md, 650md, 900md) layer, rock core oil displacement experiment result is as shown in table 9.Under 0.60PV condition, weak crosslinked polymer in PC flooding system improves recovery ratio 16.1%, than high 1.20 percentage points (table 9) of enhancing oil recovery in polymer flooding 14.9%.
Heterogeneous core oil displacement experiment in 3 times of differential layers of table 9 different chemical system
In sum, under the VII 1-3 series of strata condition of Shuan He oil field, weak crosslinked polymer in PC flooding system improves recovery ratio value all higher than polymer flooding, and synergistic result between polymkeric substance and linking agent, has not only improved polymkeric substance heat resistance, has also improved recovery ratio.
Claims (4)
1. the weak crosslinked polymer in PC flooding system for high-temperature oil reservoir, it is characterized in that: mainly the component by following concentration forms: partially hydrolyzed polyacrylamide 800～1800mg/L, organic phenol aldehyde cross-linking agent 30～300mg/L, the concentration ratio > 6 of partially hydrolyzed polyacrylamide and organic phenol aldehyde cross-linking agent.
2. the weak crosslinked polymer in PC flooding system for high-temperature oil reservoir according to claim 1, is characterized in that: mainly the component by following concentration forms: partially hydrolyzed polyacrylamide 1500mg/L, organic phenol aldehyde cross-linking agent 120mg/L.
3. the weak crosslinked polymer in PC flooding system for high-temperature oil reservoir according to claim 1 and 2, is characterized in that: described partially hydrolyzed polyacrylamide is 1630S type polymkeric substance.
4. the weak crosslinked polymer in PC flooding system for high-temperature oil reservoir according to claim 1 and 2, is characterized in that: described organic phenol aldehyde cross-linking agent is HN1 type linking agent.
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