CN106351607A - Water shut-off and profile control method for oil-water well - Google Patents
Water shut-off and profile control method for oil-water well Download PDFInfo
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- CN106351607A CN106351607A CN201611025476.6A CN201611025476A CN106351607A CN 106351607 A CN106351607 A CN 106351607A CN 201611025476 A CN201611025476 A CN 201611025476A CN 106351607 A CN106351607 A CN 106351607A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention discloses a water shut-off and profile control method for an oil-water well, and belongs to the field of water shut-off and profile control technology. The method comprises the steps of injection of temporary plugging agent solution, injection of gelled plugging agent solution and injection of oxidized gel-breaking agent solution. The water shut-off and profile control method for the oil-water well has the advantages of being simple in process, strong in operability, good in field test effect, safe and reliable and the like, the water shut-off and profile control effect is greatly improved, the pollution of the gelled plugging agent is reduced. Accordingly, the water shut-off and profile control method for the oil-water well can be widely applied to the field of the oil deposit water shut-off and profile control technology.
Description
Technical field
The invention belongs to water plugging and profiling technology field is and in particular to a kind of method of oil-water well water plugging and profile controlling.
Background technology
Some sandstone oil reservoir old fileds of east China are aqueous at present has reached more than 90%.High water cut oil supply field Development and Production band
Carry out many harm, force oil field to come decreasing water cut and increasing oil or water and oil control using technology such as oilwell water shutoff or Profile Control in Injection Wells.Stifled
In water or profile control operation, in numerous blocking agents, most-often used is gel plugging agent, and gel plugging agent mainly has chromium gel and phenolic aldehyde
Frozen glue, when blocking agent solution is injected by stratum using the method for general injection, it is difficult to ensure that blocking agent is selectively entered high permeability zone,
Blocking agent more or less all can centering less permeable layer pollute.In order to prevent or reduce centering less permeable layer pollution it is proposed that
Less permeable layer in being protected using temporary plugging technique is so as to be not affected or less affected by blocking agent pollution in water plugging and profile controlling operation.
But the most currently used diverting agent containing gel breaker composition stratum is temporarily blocked, and diverting agent can have
Less permeable layer in effect closure, but intensity less effectively blocks it is impossible to be formed in high permeability zone, quick before diverting agent breaks glue
Gelling Water-plugging profile control agent solution is clamp-oned high permeability zone by ground, under formation temperature conditions, through after a period of time, middle less permeable layer
In diverting agent breaking glue solution chemical conversion aqueous solution lose plugging action, and the Gelling Water-plugging profile control agent solution plastic in high permeability zone,
Become the blocking agent of high intensity and block high permeability zone.But because diverting agent seal-off effect and broken colloidality are conflicts, it is difficult to control
System, scene is actual extremely complex, and appearance should not be broken and but be broken glue during glue, but do not break the situation of glue during this broken glue.
Content of the invention
The present invention is directed to the deficiencies in the prior art and proposes a kind of method of oil-water well water plugging and profile controlling.The method has technique
Simply, it is workable, safe and reliable and the advantages of field test results are good.
The invention discloses a kind of method of oil-water well water plugging and profile controlling it is characterised in that described method specifically include with
Lower step:
(1) injection stage of diverting agent solution
Prepare diverting agent solution in the well site of water plugging and profile controlling well first；Secondly the diverting agent preparing solution is utilized high pressure
Plunger displacement pump injects the stratum of water plugging and profile controlling well by oil pipe, and the injection rate of diverting agent solution is every meter of core intersection 2-4m3, injection
Speed is 5-10m3/h；5-10m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid.
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water, and wherein, described Xanthan gun divides
It is 500-2000mg/l that son is measured as 10000-20000, mass concentration, and the mass concentration of organic zirconium crosslinker is 500-1000mg/
l.
(2) injection stage of gel plugging agent solution
2-3d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, the injection rate of gel plugging agent solution is
Every meter of core intersection 8-10m3, injection rate is 10-20m3/h；20-30m is injected after the completion of the injection of gel plugging agent solution3Stratum
Water displacement fluid.
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water, wherein, described poly- third
Acrylamide molecular weight is 500-1000 ten thousand, mass concentration is 4000-8000mg/l, and the mass concentration of phenolic crosslinkers is 2000-
8000mg/l.
(3) aoxidize the injection stage of gel breaker solution
3-5d after the completion of the injection of gel plugging agent solution, starts injection oxidation gel breaker solution, the note of oxidation gel breaker solution
Entering amount is every meter of core intersection 3-5m3, injection rate is 5-10m3Normally drive a well after/h, 3-5d.
Described oxidation gel breaker is potassium permanganate, and the mass concentration of potassium permanganate solution is 0.05-1%.
(4) field test
After the completion of field test, evaluate field experimentation effect.
Gel breaker is not contained, it is by Xanthan gun and the cross-linking agent group of low concentration in diverting agent used in the present invention
Become, they are existed with mixed solution state on the ground, during using gel plugging agent water plugging and profile controlling, first inject diverting agent solution, when
During diverting agent solution injection underground, it had both entered Thief zone position also into hyposmosis position, under formation temperature conditions, passed through
After a period of time, Xanthan gun and cross-linking agent crosslink reaction and generate weak frozen glue.Diverting agent by being injected does not contain gel breaker,
The weak frozen glue therefore being generated in a long time all can stable existence, will not uncontrollable broken glue and lose seal-off effect, energy
Play the effect of temporary transient closure, so temporary transient seal-off effect has controllability；Then, inject gel plugging agent solution, gel plugging agent by
The partially hydrolyzed polyacrylamide (PHPA) of higher concentration and cross-linking agent composition, are given birth to by after the weak frozen glue solution plastic injected before
The weak frozen glue becoming has stronger seal-off effect to hyposmosis position, and Thief zone position can not be formed with effective closure, therefore
The a large amount of gel plugging agent solution overwhelming majority being injected enter Thief zone position, and enter oil deposit deep part, in formation temperature
Under the conditions of, through after a period of time, the polyacrylamide of higher concentration and cross-linking agent crosslink reaction and generate the big jelly of intensity
Glue, Thief zone position is effectively blocked, and also has that a small amount of gel plugging agent solution enters hyposmosis position and plastic is formed simultaneously
Closure, less permeable layer is polluted to a certain extent.
After the gel plugging agent being injected complete plastic, clamp-on a certain amount of oxidation gel breaker solution under the high pressure of stratum,
The plastic of the diverting agent of early stage injection and gel plugging agent solution makes the in-place permeability of near wellbore zone equalize, therefore, oxidation
Gel breaker solution to getting on stratum, in less permeable layer, aoxidizes gel breaker solution degradation and falls diverting agent and gel plugging agent than more uniform,
The pollution making hyposmosis position stratum is eliminated；In high permeability zone, the amount injecting gel plugging agent solution is big, and blocking agent solution enters
Enter deep and form frozen glue, oxidation gel breaker solution can only decompose fraction gel plugging agent, and the closure on high permeability zone affects not
Greatly.So, the pollutant of less permeable layer are eliminated, and Thief zone is effectively blocked, thus reaching optionally water blockoff or tune
The purpose cutd open.
The present invention compared with prior art has the advantage that and beneficial effect:
The controlled temporary blocking method being provided using this invention, the diverting agent at hyposmosis position is not affected by gel breaker,
Intensity is big, and closure hyposmosis ability is strong, starts preferably play the effect at " temporarily blocking up " hyposmosis position, does not exist due to breaking glue
Agent impact makes the sealing characteristics of diverting agent be difficult to control problem it is ensured that the gel plugging agent fixed point of injection is injected into Thief zone portion
Position；Also due to no gel breaker in diverting agent, during later stage water plugging and profile controlling, injection gel plugging agent solution has bigger maneuver space, it is to avoid
Situation in well site or the glue out of control and broken of diverting agent during situation in injection device, loses the effect temporarily blocking up stratum；Finally inject
The oxidation gel breaker diverting agent that completely eliminates hyposmosis position and a small amount of gel plugging agent of clamp-oning it is ensured that oil well energy when driving a well
Normal production and the normal water filling of well energy, play the purpose of selective water plugging profile control, the effect of water plugging and profile controlling have been significantly increased
Rate, decreases the pollution of gel plugging agent.
Figure of description
Fig. 1 is the flow chart of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in
This:
Embodiment 1
Test oil well a32Overview: 60 DEG C of the reservoir temperature of oil well, formation pressure 12.5mpa, permeability 700 × 10-3μm2,
Formation water salinity 5682mg/l, porosity 32.3%, viscosity of crude 785mpa s, oil-water well spacing 200m, liquid produced daily by oil well
Measure as 30m3/ d, daily oil production 1.2t/d, aqueous 96.0%；Produce layer position and be 2 layers, numbering is a1、a2, core intersection is respectively
5m, 4m, permeability is respectively 1500 × 10-3μm2、200×10-3μm2, producing profile testing shows a1Layer Liquid output is 27m3/ d,
a2Layer Liquid output is 3m3/ d, wherein a1Layer is aqueous to reach more than 98.2%.Carry out oilwell water shutoff using the method for the present invention in this well
Scene application, specifically comprise the following steps that
(1) injection stage of diverting agent solution
Prepare diverting agent solution in the well site of water blockoff well first；Secondly the diverting agent preparing solution is utilized high-pressure plunger
Pump injects water blockoff well a by oil pipe32Stratum, the injection rate of diverting agent solution is every meter of core intersection 3m3, injection rate is
5m3/h；10m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid.
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water, wherein, Xanthan gun mass concentration
It is 14000-16000 for 1000mg/l, molecular weight, organic zirconium crosslinker mass concentration is 1000mg/l.
(2) injection stage of gel plugging agent solution
3d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, the injection rate of gel plugging agent solution is every
Rice core intersection 9m3, injection rate is 12m3/h；26m is injected after the completion of the injection of gel plugging agent solution3Stratum water displacement fluid.
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water, wherein, polyacrylamide
Mass concentration is 8000mg/l, molecular weight is 600-700 ten thousand, and phenolic crosslinkers mass concentration is 2000mg/l.
(3) aoxidize the injection stage of gel breaker solution
5d after the completion of the injection of gel plugging agent solution, beginning implantation quality concentration is 1.0% potassium permanganate solution, potassium permanganate
The injection rate of solution is every meter of core intersection 4m3, injection rate is 6m3Normally drive a well after/h, 4d.
(4) field test
After the completion of field test, evaluate field experimentation effect.
After normal opening well and making production, daily output liquid is 35m3/ d, oil production increases to 5.2t/d by original 1.2t/d, increase day by day
Oily 4.0t, oil increasing effect is obvious；Aqueous drop to 85.2% by original 96.0%, decline 10.8 percentage points, aqueous decline
Substantially；Production profile is obviously improved, and Thief zone, fluid producing layer have obtained effective closure, and the Liquid output of less permeable layer substantially increases,
Daily fluid production rate increases 17m3.Table 1 is oil well a before and after test32Production profile and aqueous change.
Oil well a before and after table 1 test32Production profile and aqueous change
Embodiment 2
Test oil well b21Overview: 76 DEG C of the reservoir temperature of oil well, formation pressure 13.7mpa, permeability 850 × 10-3μm2,
Formation water salinity 15685mg/l, porosity 32.3%, viscosity of crude 1568mpa s, oil-water well spacing 200m, oil well is produced daily
Liquid measure is 30m3/ d, daily oil production 1.5t/d, aqueous 95.0%；Produce layer position and be 2 layers, numbering is b1、b2, core intersection is respectively
It is 4m, 6m, permeability is respectively 1200 × 10-3μm2、150×10-3μm2, producing profile testing shows b1Layer Liquid output be
25.0m3/ d, b2Layer Liquid output is 5.0m3/ d, wherein b1Layer is aqueous to reach 99.2%.Carry out oil using the method for the present invention in this well
The scene application of well water blockoff, specifically comprises the following steps that
(1) injection stage of diverting agent solution
First in water blockoff well b21Well site prepare diverting agent solution；Secondly the diverting agent preparing solution is utilized high-pressure column
Plug pump injects water blockoff well b by oil pipe21Stratum, the injection rate of diverting agent solution is every meter of core intersection 2m3, injection rate is
7m3/h；8m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid.
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water, wherein, Xanthan gun mass concentration
It is 10000-12000 for 2000mg/l, molecular weight, organic zirconium crosslinker mass concentration is 500mg/l.
(2) injection stage of gel plugging agent solution
2d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, the injection rate of gel plugging agent solution is every
Rice core intersection 10m3, injection rate is 10m3/h；20m is injected after the completion of the injection of gel plugging agent solution3Stratum water displacement fluid.
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water, wherein, polyacrylamide
Mass concentration is 6000mg/l, molecular weight is 800-900 ten thousand, and phenolic crosslinkers mass concentration is 7000mg/l.
(3) aoxidize the injection stage of gel breaker solution
4d after the completion of the injection of gel plugging agent solution, beginning implantation quality concentration is 0.1% potassium permanganate solution, potassium permanganate
The injection rate of solution is every meter of core intersection 3m3, injection rate is 10m3Normally drive a well after/h, 5d.
(4) field test
After the completion of field test, evaluate field experimentation effect.
After normal opening well and making production, daily output liquid is 35m3/ d, oil production increases to 6.2t/d by original 1.5t/d, increase day by day
Oily 4.7t, oil increasing effect is obvious；Aqueous drop to 81.5% by original 95.0%, decline 13.5 percentage points, aqueous decline
Substantially；Production profile is obviously improved, and Thief zone, fluid producing layer have obtained effective closure, and the Liquid output of less permeable layer substantially increases,
Daily fluid production rate increases 15m3.Table 2 is b before and after test21Production profile and aqueous change.
Oil well b before and after table 2 test21Production profile and aqueous change
Embodiment 3:
Test water injection well c42Overview: 50 DEG C of the formation temperature of well, water injection pressure 5.2mpa, permeability 850 × 10-3μm2,
Water injection rate 100m3/d；Water filling layer position is 3 layers, and numbering is c1、c2、c3, thickness is 5m, 3m, 6m respectively, and intake profile test shows
c1Layer water absorption is 10m3/ d, c2Layer water absorption is 75m3/ d, c3Layer water absorption is 25m3/ d, wherein c2Layer water absorption has accounted for always
The 75.0% of water injection rate.Carry out the scene application of well profile modification using the method for the present invention in this well, specifically comprise the following steps that
(1) injection stage of diverting agent solution
First in profile control well c42Well site prepare diverting agent solution；Secondly the diverting agent preparing solution is utilized high-pressure column
Plug pump passes through oil pipe injection profile well c42Stratum, the injection rate of diverting agent solution is every meter of core intersection 4m3, injection rate is
10m3/h；5m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid.
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water, wherein, Xanthan gun mass concentration
It is 16000-18000 for 500mg/l, molecular weight, organic zirconium crosslinker mass concentration is 800mg/l.
(2) injection stage of gel plugging agent solution
2d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, the injection rate of gel plugging agent solution is every
Rice core intersection 8m3, injection rate is 20m3/h；30m is injected after the completion of the injection of gel plugging agent solution3Stratum water displacement fluid.
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water, wherein, polyacrylamide
Mass concentration is 4000mg/l, molecular weight is 500-600 ten thousand, and phenolic crosslinkers mass concentration is 8000mg/l.
(3) aoxidize the injection stage of gel breaker solution
3d after the completion of the injection of gel plugging agent solution, beginning implantation quality concentration is 0.5% potassium permanganate solution, potassium permanganate
The injection rate of solution is every meter of core intersection 5m3, injection rate is 5m3Normally drive a well after/h, 3d.
(4) field test
After the completion of field test, evaluate field experimentation effect.
Well normally drives a well after water filling, and water injection pressure is increased to 9.8mpa by original 5.2mpa, and pressure index raises 21；
Intake profile be improved significantly, c1Layer water absorption is by 10m3/ d increases to 30m3/ d, c2Layer water absorption is by original 75m3Under/d
Drop to 45m3/ d, produces and substantially blocks, c3Layer water absorption is by 25m3/ d increases to 45m3/ d, total water injection rate is by original 100m3/d
Increase to 120m3/d.Table 3 is c before and after test42The water absorption change of different layers position.
Well c before and after table 3 test42Intake profile changes
Embodiment 4:
Test water injection well d40Overview: 55 DEG C of the formation temperature of well, water injection pressure 7.2mpa, permeability 1100 × 10-3μ
m2, water injection rate 70m3/d；Water filling layer position is 3 layers, and numbering is d1、d2、d3, thickness is 5m, 7m, 3m respectively, and intake profile tests table
Bright d1Layer water absorption is 12m3/ d, d2Layer water absorption is 50m3/ d, d3Layer water absorption is 8m3/ d, wherein d2Layer water absorption accounts for
The 71.4% of total water injection rate.Carry out the scene application of well profile modification using the method for the present invention in this well, specifically comprise the following steps that
(1) injection stage of diverting agent solution
First in profile control well d40Well site prepare diverting agent solution；Secondly the diverting agent preparing solution is utilized high-pressure column
Plug pump passes through oil pipe injection profile well d40Stratum, the injection rate of diverting agent solution is every meter of core intersection 3.5m3, injection rate
For 8m3/h；7m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid.
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water, wherein, Xanthan gun mass concentration
It is 12000-15000 for 1500mg/l, molecular weight, organic zirconium crosslinker mass concentration is 600mg/l.
(2) injection stage of gel plugging agent solution
3d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, the injection rate of gel plugging agent solution is every
Rice core intersection 9m3, injection rate is 20m3/h；23m is injected after the completion of the injection of gel plugging agent solution3Stratum water displacement fluid.
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water, wherein, polyacrylamide
Mass concentration is 5000mg/l, molecular weight is 700-800 ten thousand, and phenolic crosslinkers mass concentration is 5000mg/l.
(3) aoxidize the injection stage of gel breaker solution
After the injection of gel plugging agent solution completes 5d, beginning implantation quality concentration is 0.05% potassium permanganate solution, permanganic acid
The injection rate of potassium solution is every meter of core intersection 5m3, injection rate is 10m3Normally drive a well after/h, 3d.
(4) field test
After the completion of field test, evaluate field experimentation effect.
Well normally drives a well after water filling, and water injection pressure is increased to 12.5mpa by original 7.2mpa, and pressure index raises
20；Intake profile be improved significantly, d1Layer water absorption is by original 12m3/ d rises 45m3/ d, d2Layer water absorption is by 50m3Under/d
Drop to 25m3/ d, produces and substantially blocks, d3Layer water absorption is by 8m3/ d increases to 20m3/ d, total water injection rate is by original 70m3/ d increases
It is added to 90m3/d.Table 4 is well d before and after test40The water absorption change of different layers position.
Well d before and after table 4 test40Intake profile changes
Claims (6)
1. a kind of method of oil-water well water plugging and profile controlling is it is characterised in that described controlled temporary blocking method specifically includes following steps:
(1) injection stage of diverting agent solution
Prepare diverting agent solution in the well site of water plugging and profile controlling well first；Secondly the diverting agent preparing solution is utilized high-pressure plunger
Pump injects the stratum of water plugging and profile controlling well by oil pipe, and the injection rate of diverting agent solution is every meter of core intersection 2-4m3, injection rate
For 5-10m3/h；5-10m is injected after the completion of the injection of diverting agent solution3Stratum water displacement fluid；
Described diverting agent solution is made up of Xanthan gun, organic zirconium crosslinker and stratum water；
(2) injection stage of gel plugging agent solution
2-3d after the completion of the injection of diverting agent solution, starts to inject gel plugging agent solution, and the injection rate of gel plugging agent solution is every meter
Core intersection 8-10m3, injection rate is 10-20m3/h；20-30m is injected after the completion of the injection of gel plugging agent solution3Stratum Shui Ding
For liquid；
Described gel plugging agent solution is made up of polyacrylamide, phenolic crosslinkers and stratum water；
(3) aoxidize the injection stage of gel breaker solution
3-5d after the completion of the injection of gel plugging agent solution, starts injection oxidation gel breaker solution, the injection rate of oxidation gel breaker solution
For every meter of core intersection 3-5m3, injection rate is 5-10m3Normally drive a well after/h, 3-5d；
Described oxidation gel breaker is potassium permanganate；
(4) field test
After the completion of field test, evaluate field experimentation effect.
2. controlled temporary blocking method according to claim 1 is it is characterised in that described Xanthan gun mass concentration is 500-
2000mg/l, molecular weight is 10000-20000.
3. controlled temporary blocking method according to claim 1 and 2 is it is characterised in that described organic zirconium crosslinker, its quality
Concentration is 500-1000mg/l.
4. the controlled temporary blocking method according to claim 1 is it is characterised in that described Molecular Weight for Polyacrylamide is 500-
10000000, mass concentration is 4000-8000mg/l.
5. controlled temporary blocking method according to claim 4 is it is characterised in that described phenolic crosslinkers, its mass concentration
For 2000-8000mg/l.
6. controlled temporary blocking method according to claim 1 is it is characterised in that described potassium permanganate mass concentration is
0.05-1%.
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|---|---|---|---|---|
| CN106968635A (en) * | 2017-03-28 | 2017-07-21 | 四川光亚聚合物化工有限公司 | A kind of efficient depth profile control method of Low Damage |
| CN106968635B (en) * | 2017-03-28 | 2019-03-19 | 四川光亚聚合物化工有限公司 | A kind of efficient depth profile control method of Low Damage |
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