CN105086967B - A kind of anti-channeling is stifled to alter agent and is carried out adjusting the construction method for blocking and altering with it - Google Patents
A kind of anti-channeling is stifled to alter agent and is carried out adjusting the construction method for blocking and altering with it Download PDFInfo
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- CN105086967B CN105086967B CN201510266436.XA CN201510266436A CN105086967B CN 105086967 B CN105086967 B CN 105086967B CN 201510266436 A CN201510266436 A CN 201510266436A CN 105086967 B CN105086967 B CN 105086967B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
Abstract
Blocked up the invention provides a kind of anti-channeling and alter agent and carried out adjusting the construction method for blocking and altering with it.Anti-channeling provided by the invention is stifled alter agent include the pre- blocking agent of high temperature resistant as preposition pre- stifled slug, as it is middle strengthen slug strengthen Gelling Plugging Agent and as the rearmounted high-intensity resin blocking agent for sealing slug, the anti-channeling, which is blocked up, alters agent and has the characteristics that high temperature resistant, long-time stability, sealing characteristics are good.Present invention also offers altering agent using above-mentioned anti-channeling is stifled and carrying out adjusting the construction method for blocking and altering, its construction technology is simple, is constructed after can directly preparing at the scene.Anti-channeling provided by the invention is stifled, which to alter agent, can effectively solve adverse effect of the thick oil thermal extraction vapour/gas channeling phenomenon to production, be played an important role to extending the heavy oil wells production cycle, improving recovery ratio.
Description
Technical field
The invention belongs to the raising petroleum recovery technology of oil field development, and in particular to a kind of anti-channeling is stifled to alter agent and use it
Carry out adjusting the construction method for blocking and altering.
Background technology
Cyclic steam injection tech, steam flooding technology, fireflood technology are the important means of China's Development of Viscous Crude Oil, through excessive
After round steam injection/gas production, due to permeability contrast between reservoir, horizontal contradiction and longitudinal contradiction are more prominent, cause steam/gas
Body is advanced by leaps and bounds along high permeability zone band, is caused vapour/gas channeling phenomenon serious, is caused oil well not produce normally.
For heavy crude reservoir vapour/gassed-out well, at present frequently with technologies such as polymer gel, nitrogen foam gels, can reach
Improve and inhale vapour/gas section, improve the purpose of recovery factor of heavy oil reservoir.But the universal gel strength of plugging agent of these prior arts compared with
Weak, plugging strength is low, and stationary phase is shorter, while the temperature of heavy crude reservoir steam injection/gas exploitation is high, and general steam injection/temperature degree exists
More than 200 DEG C, some oil field gas injections/temperature degree is even more than 300 DEG C, and when steam injection/atmospheric pressure is higher and stratum has
During macropore, it is difficult to the stifled effect altered of the anti-channeling that reaches a high temperature.
The content of the invention
Agent is altered to solve the above problems, being blocked up it is an object of the invention to provide a kind of anti-channeling.The anti-channeling is stifled, which to alter agent, includes resistance to height
The pre- blocking agent of temperature, strengthen Gelling Plugging Agent and high-intensity resin blocking agent, it has the characteristics of high temperature resistant, stability are good, sealing ratiod is high.
Alter agent using above-mentioned anti-channeling is stifled it is a further object of the present invention to provide a kind of and carry out adjusting the construction method for blocking and altering.
To reach above-mentioned purpose, agent is altered the invention provides a kind of anti-channeling is stifled, wherein, the anti-channeling is stifled, which to alter agent, includes high temperature resistant
Pre- blocking agent, strengthen Gelling Plugging Agent and high-intensity resin blocking agent；
Counted using the gross weight of the raw material of the pre- blocking agent of the high temperature resistant as 100wt%, prepare the raw material bag of the pre- blocking agent of the high temperature resistant
Include：Polyacrylamide 0.1-0.4wt%, complex thickener 0.1-0.3wt%, sealing agent 3-6wt%, heat stabilizer 0.02-
0.05wt%, surplus are water；
Counted using the gross weight of the raw material of the reinforcing Gelling Plugging Agent as 100wt%, prepare the raw material bag of the reinforcing Gelling Plugging Agent
Include：Polyacrylamide 0.2-0.6wt%, multiple crosslinking agent 0.1-0.4wt%, pre-crosslinked gel volume expansion grain 3-6wt%, enhancing
Agent 2-5wt%, surplus are water；
In parts by weight, preparing the raw material of the high-intensity resin blocking agent includes：Silicate stablizes native 50-70 parts, aluminic acid
Salt cement 6-10 parts, active bentonite 3-5 parts, thermoset phenolic resin 10-20 parts and water 100-120 parts.
The pre- blocking agent of high temperature resistant can effectively block target zone deep vapour/has channeling passage as preposition pre- stifled slug, and rise
To the effect for protecting follow-up slug；The Gelling Plugging Agent of strengthening strengthens the work that slug can play push, collaboration blocks as among
With the effect that raising envelope is altered；The high-intensity resin blocking agent primarily serves sealing effect, forms envelope as rearmounted sealing slug
Stifled performance is stronger into colloid, improves its resistance to gentle resistance to steam flush intensity.
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the pre- blocking agent of the high temperature resistant, the reinforcing Gelling Plugging Agent, described high-strength
The volume ratio for spending resin blocking agent three is 2-4:5-7:1-2.
Anti-channeling provided by the present invention is stifled to alter agent and adjust and block the dosage Q for altering construction and below equation can be used to calculate：Q
=π RRepair 2H Φ β, on this basis, the dosage of the pre- blocking agent of high temperature resistant is Q1, the dosage of strengthening Gelling Plugging Agent is Q2, high intensity tree
The dosage of fat blocking agent is Q3, also, anti-channeling blocks up total the dosage Q=Q1+Q2+Q3, Q1 for altering agent：Q2：Q3=2-4:5-7:1-2, Q1,
Q2, Q3 unit are m3。
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the polyacrylamide selected in the pre- blocking agent of high temperature resistant is part water
Polyacrylamide is solved, it is further preferred that the degree of hydrolysis of the partially hydrolyzed polyacrylamide (PHPA) is 15%-30%, molecular weight is
15000000-2,500 ten thousand.
Preferably, the complex thickener selected in the pre- blocking agent of the high temperature resistant is polyanion cellulose, xanthans, poly- third
The group of one or more combinations, more preferably polyanion cellulose and xanthans in acrylamide and modified starch
Close.In the combination of polyanion cellulose and xanthans, it is preferable that the two accounts for the 50- of complex thickener gross weight respectively
65wt% and 35-50wt%, more preferably 55-60wt% and 40-45wt%.
Preferably, the sealing agent selected in the pre- blocking agent of the high temperature resistant is cotton seed hulls, rice chaff, sawdust, walnut shell and bark
The combination of one or more combinations, more preferably cotton seed hulls and bark powder in powder.In cotton seed hulls and the group of bark powder
In conjunction, it is preferable that the two is respectively the 60-75wt% and 25-40wt% of sealing agent gross weight, more preferably 65-70wt%
And 30-35wt%.
Preferably, the heat stabilizer selected in the pre- blocking agent of the high temperature resistant is inorganic salts, more preferably ammonium chloride, chlorine
Change one or more combinations in sodium and potassium chloride, more preferably ammonium chloride.
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the polyacrylamide selected in Gelling Plugging Agent of strengthening is part water
Polyacrylamide is solved, it is further preferred that the degree of hydrolysis of partially hydrolyzed polyacrylamide (PHPA) is 15%-30%, molecular weight 1200
Ten thousand -1,600 ten thousand.
Preferably, the multiple crosslinking agent selected in Gelling Plugging Agent of strengthening is the compound of aldehydes, phenols and melamine
Resin system；It is further preferred that in above-mentioned compound resin system, counted using multiple crosslinking agent gross weight as 100wt%, aldehydes,
Phenols and melamine account for 55-70wt%, 15-35wt% and 10-30wt% of gross weight, preferably 60-65wt%, 20- respectively
30wt% and 15-25wt%.
In above-mentioned anti-channeling is blocked up and alters agent, the pre-crosslinked gel volume expansion grain selected in Gelling Plugging Agent of strengthening can be ability
Product is often used in domain, and its performance parameter is preferably：Solid content >=90%, water-absorbent expanding multiple >=8；More preferably Shenyang is believed forever
The pre-crosslinked gel volume expansion grain of Fine Chemical Co., Ltd's production.
In above-mentioned compound resin system, it is preferable that the aldehydes is in paraformaldehyde, formaldehyde, furfural and methenamine
One or more combinations, more preferably paraformaldehyde.
In above-mentioned compound resin system, it is preferable that the phenols is one kind in 3 mixed cresol, resorcinol and phenol
Or a variety of combinations, more preferably 3 mixed cresol.
Preferably, the reinforcing agent selected in Gelling Plugging Agent of strengthening is rubber powder, bark powder, rice chaff, rice husk and sawdust
In one or more combinations, more preferably rice husk and rubber powder combination, wherein, using reinforcing agent gross weight as
100wt% is counted, and the two is respectively the 55-70wt% and 30-45wt% of gross weight, preferably 60-65wt% and 35-40wt%.
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the stable soil of silicate selected in the high-intensity resin blocking agent includes
Pulverized limestone, flyash and stable fine grained soil, are counted it is further preferred that stablizing native gross weight using silicate as 100wt%, three's difference
Stablize 30-50wt%, 25-45wt% and 15-30wt% of native gross weight, preferably 35-45wt%, 30-40wt% for silicate
And 20-25wt%.
In the stable soil of above-mentioned silicate, it is preferable that the pulverized limestone is calcareous pulverized limestone, and the flyash is calcium oxide
Mass percent be 2%-6% sial flyash, size≤15mm (diameter) of maximum soil block in the stable fine grained soil,
The content of organic matter≤10%, preferably plasticity index are 12-20 cohesive soil.
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the aluminate cement selected in the high-intensity resin blocking agent is high-strength
One or more combinations in sulphate aluminium cement, expansion sulphate aluminium cement and high-strength ferrous aluminate cement, it is preferably height
Strong ferrous aluminate cement.
Agent is altered above-mentioned anti-channeling is stifled, it is preferable that the active bentonite selected in the high-intensity resin blocking agent includes sodium
Base bentonite, α-sodium olefin sulfonate and redispersable latex powder, counted using active bentonite gross weight as 100wt%, three is respectively
25-40wt%, 50-65wt% and 6-12wt% of active bentonite gross weight, preferably 30-35wt%, 55-60wt% and 8-
10wt%.Above-mentioned redisperse latex powder is preferably the copolymer of ethylene/vinyl acetate, vinyl acetate/versatic acid ethylene copolymer
The copolymer of one or more combinations, more preferably ethylene/vinyl acetate in thing and acrylic copolymer.
The compound method that above-mentioned anti-channeling is stifled to alter agent is：
(1) above-mentioned anti-channeling is stifled alters in agent, and the kinematic viscosity of the pre- blocking agent of high temperature resistant is 30-100mPas, is easy to construction to note
Enter, colloid viscosity is 3000-15000mPas, and its preparation method comprises the following steps：
First appropriate water is added in Agitation Tank and (8-10m can be selected3Agitation Tank), poly- third is added under stirring
Acrylamide, complex thickener, sealing agent and heat stabilizer etc. are sequentially added after stirring, is stirred, obtained certain viscosity,
The pre- blocking agent of the suitable high temperature resistant of mobility.
When preparing the pre- blocking agent of above-mentioned high temperature resistant, 40-95 DEG C of its gelling temperature, gelation time 48-72 hours (adjustable), it is made
The pre- blocking agent maximum operation (service) temperature of high temperature resistant can reach 200 DEG C, sealing ratiod >=95%.
(2) above-mentioned anti-channeling is stifled alters in agent, and the kinematic viscosity for strengthening Gelling Plugging Agent is 50-150mPas, is easy to construction to note
Enter, colloid viscosity >=1 × 105MPas, its preparation method comprise the following steps：
First appropriate water is added in Agitation Tank and (8-10m can be selected3Agitation Tank), poly- third is added under stirring
Acrylamide, it is to be mixed uniformly after sequentially add multiple crosslinking agent, pre-crosslinked gel volume expansion grain and reinforcing agent etc., stir,
The suitable reinforcing Gelling Plugging Agent of certain viscosity, mobility is made.
When preparing above-mentioned reinforcing Gelling Plugging Agent, 40-90 DEG C of its gelling temperature, gelation time 48-72 hours (adjustable), it is made
Reinforcing Gelling Plugging Agent maximum operation (service) temperature can reach 300 DEG C, sealing ratiod >=95%.
(3) above-mentioned anti-channeling is stifled alters in agent, and the kinematic viscosity of high-intensity resin blocking agent is 30-80mPas, is easy to construction to note
Enter, its preparation method comprises the following steps：
First appropriate water is added in Agitation Tank and (1-5m can be selected3Agitation Tank), sequentially added under stirring
Silicate stable soil, aluminate cement, active bentonite and thermoset phenolic resin etc., stir, and certain viscosity, stream is made
The suitable high-intensity resin blocking agent of dynamic property.
When preparing above-mentioned high-intensity resin blocking agent, its gelling temperature is 40-100 DEG C, and gelation time 10-240 hours (can
Adjust), obtained high-intensity resin blocking agent breakthrough pressure ＞ 10Mpa/m, highest heatproof temperature can reach 350 DEG C, sealing ratiod >=
95%.
Present invention also offers alter agent using above-mentioned anti-channeling is stifled and carry out adjusting the construction method for blocking and altering.
Tune blocks when altering construction, and following methods can be used to calculate for the stifled dosage for altering agent of anti-channeling：
(1) plugging agent dosage is according to following empirical equation：
Q=π RRepair 2HΦβ
In formula：The total dosage of Q-plugging agent, unit m3；
RRepair- adjust to block and alter correction radius, m；
H-tune, which blocks, alters core intersection, m；
Φ-oil reservoir average effective porosity, %；
β-adjustment in direction coefficient.
(2) determination of parameter
1. tune, which blocks, alters radius RRepair
RRepair=R × T
The oily area's benchmark of R- constructions, which is adjusted to block, alters radius, was blocked according to former tune and alters well design and the suitable tune of data determination
Block and alter mean radius；
The average fltting speed of T=well groups injectant fltting speed/construction oil area injectant；
2. tune, which blocks, alters core intersection：
H=Σ HiQi/Qmax
In formula：H-tune, which blocks, alters core intersection, m；Hi-individual layer inhales vapour thickness, m；Qi-individual layer is relative to be inhaled
Vapour amount, %；The maximum relative suction steam absorbing amount of Qmax=individual layers, %；
3. tune, which blocks, alters well group porosity：For well group electric-log interpretation value；
4. adjustment in direction factor beta：For the average steam injection fltting speed/well group maximum fltting speed of well group.
Tune provided by the invention blocks the construction method altered and comprised the following steps：
First the clear water injected in well under normal temperature or sewage are noted or adopted as prepad fluid, then injected into target zone resistance to heat
The pre- blocking agent of high temperature forms preposition pre- stifled slug, reinjects reinforcing Gelling Plugging Agent and forms middle reinforcing slug, then into thermal production well
The clear water or sewage injected under normal temperature waits solidifying 24-48h as displacement fluid and closing well, then high-intensity resin blocking agent is injected into target zone
Rearmounted sealing slug is formed, the clear water injected in well under normal temperature or sewage are noted or adopted to most backward heat as displacement fluid, and closing well is waited
Solidifying 6-8h.
In above-mentioned construction method, it is preferable that discharge capacity when the pre- blocking agent of the high temperature resistant is injected into target zone is 5-
10m3/ h, operation pressure are within 15MPa.
In above-mentioned construction method, it is preferable that the discharge capacity when reinforcing Gelling Plugging Agent is injected into target zone is 5-
10m3/ h, operation pressure are within 15MPa.
In above-mentioned construction method, it is preferable that the discharge capacity when reinforcing Gelling Plugging Agent is injected into target zone is 10-
20m3/ h, operation pressure are within 20MPa.
Above-mentioned construction method further specifically comprises the following steps：
First the clear water injected in well under normal temperature or sewage are noted or adopted as prepad fluid, in order to cool down thermal production well to heat
Cylinder, slow down the gelation time of the pre- blocking agent of the high temperature resistant being subsequently implanted into, target zone can be entered by ensureing the pre- blocking agent of high temperature resistant of injection
Deep carries out envelope and altered, while ensures the smooth Safety Injection of site operation；
The above-mentioned pre- blocking agent of high temperature resistant is pumped into target zone again, as preposition pre- stifled slug, closure target zone deep vapour/gas
Passage is altered, and plays a part of the follow-up slug of protection；
Above-mentioned reinforcing Gelling Plugging Agent is pumped into target zone again, strengthens slug as centre, plays push, collaboration blocks
Effect, improve the effect that envelope is altered；
The clear water or sewage injected again into thermal production well under normal temperature is as displacement fluid, it is therefore an objective to replaces the blocking agent in pit shaft
Into stratum, and closing well waits solidifying 24-48h, and requires upper operation in time, tubing string test in deepened well, if there is blocking agent in pit shaft,
Then rinse in time, ensure the smooth construction of follow-up slug；
Above-mentioned high-intensity resin blocking agent is pumped into target zone again, as rearmounted sealing slug, primarily serves sealing effect,
It is stronger into colloid to form sealing characteristics, improves its resistance to gentle resistance to steam flush intensity；
Most backward heat note adopts the clear water injected in well under normal temperature or sewage as displacement fluid, it is therefore an objective to will be stifled in pit shaft
Agent is replaced into stratum, and closing well waits solidifying 6-8h, and requires upper operation in time, tubing string test in deepened well, and is rinsed to artificial
Shaft bottom, if rushing motionless brill is milled to artificial bottom of a well, ensure there is no blocking agent in pit shaft, it is desirable to which positive well-flushing returns clear water or sewage, proposes to apply
Work tubing string, by the lower heat note of thermal recovery scheme requirement or thermal recovery tubular column completion.
It is to be made by the pre- blocking agent of high temperature resistant as preposition pre- stifled slug, reinforcing Gelling Plugging Agent that anti-channeling provided by the invention, which is blocked up and alters agent,
Strengthen slug, high-intensity resin blocking agent as rearmounted sealing slug triplex slug composition for centre, there is high temperature resistant, long-term steady
Qualitative, the features such as sealing characteristics is good, while the envelope is altered that agent preparation method is easy, construction technology is simple, can directly be matched somebody with somebody at the scene
Constructed after system, can effectively solve adverse effect of the thick oil thermal extraction vapour/gas channeling phenomenon to production, to extending heavy oil wells production
Cycle, raising recovery ratio play an important role.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
Present embodiments provide that a kind of anti-channeling is stifled to alter agent, it includes the pre- blocking agent of high temperature resistant as preposition pre- stifled slug, reinforcing
Gelling Plugging Agent strengthens slug, high-intensity resin blocking agent as rearmounted sealing slug triplex slug composition among being used as.
Wherein：
Counted using the gross weight of the pre- blocking agent of high temperature resistant as 100wt%, its raw material includes：Polyacrylamide 0.3wt%, composite thickening
Agent 0.3wt%, sealing agent 6wt%, heat stabilizer 0.05wt%, surplus are that W blocks inject water；
Polyacrylamide is partially hydrolyzed polyacrylamide (PHPA), and its degree of hydrolysis is 25%, and molecular weight is 20,000,000；
Complex thickener is the combination of polyanion cellulose and xanthans, and the two accounts for complex thickener gross weight respectively
58wt% and 42wt%；
Sealing agent is the combination of cotton seed hulls and bark powder, and the two accounts for the 65wt% and 35wt% of sealing agent gross weight respectively；
Heat stabilizer is ammonium chloride.
Counted using the gross weight for strengthening Gelling Plugging Agent as 100wt%, its raw material includes：Polyacrylamide 0.5wt%, composite crosslinking
Agent 0.4wt%, pre-crosslinked gel volume expansion grain 5wt%, reinforcing agent 5wt%, surplus are that W blocks inject water；
Polyacrylamide is partially hydrolyzed polyacrylamide (PHPA), and its degree of hydrolysis is 30%, and molecular weight is 15,000,000；
Multiple crosslinking agent is the compound resin system of paraformaldehyde, 3 mixed cresol and melamine, and three accounts for compound respectively
62wt%, 22wt% and 16wt% of crosslinking agent gross weight；
The product that pre-crosslinked gel volume expansion grain generates for Shenyang Yong Xin Fine Chemical Co., Ltd, solid content >=90%,
Water-absorbent expanding multiple >=8；
Reinforcing agent is the combination of powdered rice hulls and rubber powder, and the two is respectively the 64wt% and 36wt% of reinforcing agent gross weight.
By weight, preparing the raw material of high-intensity resin blocking agent includes：Silicate stable native 65 parts, aluminate cement 10
Part, 5 parts of active bentonite, 20 parts of thermoset phenolic resin, W blocks 120 parts of water of injection；
The stable soil of silicate is the combination of pulverized limestone, flyash and stable fine grained soil, and three is respectively the stable soil of silicate
40wt%, 35wt% and 25wt% of gross weight；
Aluminate cement is high-strength ferrous aluminate cement；
Active bentonite includes sodium bentonite, α-sodium olefin sulfonate and redispersable latex powder, and three is respectively activity
Bentonite gross weight 34%, 58wt% and 8wt%；
Redispersable latex powder is the copolymer of ethylene/vinyl acetate.
Also, the volume ratio of the pre- blocking agent of high temperature resistant, reinforcing Gelling Plugging Agent and high-intensity resin blocking agent is 3:6:1.
The present embodiment additionally provides the stifled compound method for altering agent of above-mentioned anti-channeling：
1st, the compound method of the pre- blocking agent of high temperature resistant includes：
Site operation using when appropriate water is first added to 8-10m3In Agitation Tank, polypropylene is added under stirring
Acid amides it is to be mixed uniformly after, sequentially add complex thickener, sealing agent, heat stabilizer, stir, be made certain viscosity, stream
The suitable pre- blocking agent of high temperature resistant of dynamic property.
Henchnmrk test：
(1) measure of kinematic viscosity
The pre- blocking agent solution 500mL of the high temperature resistant just prepared is inserted in the measuring cylinder of rotation viscometer, surveyed at normal temperatures
5min is tried, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 1.
The kinematic viscosity experimental result of the pre- blocking agent solution of the high temperature resistant of table 1
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 58 | 58 | 62 | 65 | 68 | 72 | 70 | 66 | 68 | 70 |
(2) measure of colloid viscosity
The pre- blocking agent solution 500mL of high temperature resistant after formation cross-linking system is inserted in the measuring cylinder of rotation viscometer, 80
5min is tested under the conditions of DEG C, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 2.
The colloid viscosity experiment result of the pre- blocking agent solution of the high temperature resistant of table 2
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 8975 | 9552 | 10230 | 10897 | 11521 | 12030 | 11478 | 10953 | 10216 | 10595 |
(3) heatproof estimation of stability
By the pre- blocking agent solution of high temperature resistant after formation cross-linking system, it is divided into 6 parts by every part of 500mL, pours into sealing steel respectively
It is placed on after bottle in constant temperature oven, under the conditions of 200 DEG C, after constant temperature 10d, taking-up portion is surveyed it by the assay method of colloid viscosity and glued
Angle value N (1), portion is taken out per 10d later and surveys its viscosity number N (2), N (3), N (4), N (5), N (6) respectively, takes its minimum value to be
Viscosity retention ratio measurement result, is shown in Table 3.
Viscosity retention ratio is calculated as follows：
R (i)=N (i) × 100/N (0)
In formula：I=1-6；
R(i)：Viscosity retention ratio, represented (%) with percentage；
N(0)：The pre- blocking agent initial-viscosity number of high temperature resistant, unit are mpas (mPas)
N(i)：Viscosity number after the pre- blocking agent heatproof of high temperature resistant, unit are mpas (mPas).
The colloid viscosity experiment result of the pre- blocking agent solution of the high temperature resistant of table 3
| Time, d | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Viscosity, mPas | 10645 | 9953 | 9726 | 9539 | 9260 | 8971 | 8569 |
By the pre- blocking agent of above-mentioned high temperature resistant at 200 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention ratio >=80.5%
(under the conditions of 200 DEG C, 60d retention rates meet heatproof standard more than 70%).
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward the pre- blocking agent solution of high temperature resistant is injected in rock core, be put into
Taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table 4.
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 4
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 11 | 80 | 0.812 | 0.031 | 96.2 |
| 12 | 80 | 0.985 | 0.041 | 95.8 |
| 13 | 80 | 1.035 | 0.036 | 96.5 |
From table 4, it can be seen that the pre- blocking agent of the high temperature resistant has preferable shut-off capacity, sealing ratiod reaches more than 95%.
2nd, strengthening the compound method of Gelling Plugging Agent includes：
Site operation using when appropriate water is first added to 8-10m3In Agitation Tank, polypropylene is added under stirring
Acid amides it is to be mixed uniformly after, sequentially add multiple crosslinking agent, pre-crosslinked gel volume expansion grain, reinforcing agent, stir, be made one
Determine the suitable reinforcing Gelling Plugging Agent of viscosity, mobility.
Henchnmrk test：
(1) measure of kinematic viscosity
The reinforcing Gelling Plugging Agent solution 500mL just prepared is inserted in the measuring cylinder of rotation viscometer, surveyed at normal temperatures
5min is tried, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 5.
Table 5 strengthens the kinematic viscosity experimental result of Gelling Plugging Agent solution
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 90 | 92 | 95 | 97 | 98 | 102 | 100 | 96 | 98 | 101 |
(2) measure of colloid viscosity
Reinforcing Gelling Plugging Agent solution 500mL is inserted in the measuring cylinder of rotation viscometer after cross-linking system will be formed, at 80 DEG C
Under the conditions of test 5min, during which per 0.5min read a numerical value, it is measurement result to take its average value, is shown in Table 6.
Table 6 strengthens the colloid viscosity experiment result of Gelling Plugging Agent solution
| Time, min | Viscosity, mPas | Time, min | Viscosity, mPas |
| 0.5 | 109530 | 3 | 113030 |
| 1 | 110034 | 3.5 | 112478 |
| 1.5 | 110859 | 4 | 112053 |
| 2 | 112097 | 4.5 | 111021 |
| 2.5 | 112821 | 5 | 110595 |
(3) heatproof estimation of stability
By the reinforcing Gelling Plugging Agent solution after formation cross-linking system, it is divided into 6 parts by every part of 500mL, pours into sealing steel respectively
It is placed on after bottle in constant temperature oven, under the conditions of 300 DEG C, after constant temperature 10d, taking-up portion is surveyed it by the assay method of colloid viscosity and glued
Angle value N (1), portion is taken out per 10d later and surveys its viscosity number N (2), N (3), N (4), N (5), N (6) respectively, takes its minimum value to be
Viscosity retention ratio measurement result, is shown in Table 7.
Viscosity retention ratio is calculated as follows：
R (i)=N (i) × 100/N (0)
In formula：
I=1-6；
R(i)：Viscosity retention ratio, represented (%) with percentage；
N(0)：Strengthen Gelling Plugging Agent initial-viscosity number, unit is mpas (mPas)
N(i)：Viscosity number after reinforcing Gelling Plugging Agent heatproof, unit is mpas (mPas).
Table 7 strengthens the colloid viscosity experiment result of Gelling Plugging Agent solution
| Time, d | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Viscosity, mPas | 110628 | 108850 | 107261 | 105061 | 99764 | 93871 | 86843 |
By above-mentioned reinforcing Gelling Plugging Agent at 300 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention ratio >=78.5%
(under the conditions of 300 DEG C, 60d retention rates meet heatproof standard more than 65%).
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward injection reinforcing Gelling Plugging Agent solution in rock core, be put into
Taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table 8.
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 8
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 14 | 80 | 0.935 | 0.045 | 95.2 |
| 15 | 80 | 1.102 | 0.041 | 96.3 |
| 16 | 80 | 1.328 | 0.059 | 95.5 |
As can be seen from Table 8, the reinforcing Gelling Plugging Agent has preferable shut-off capacity, and sealing ratiod reaches more than 95%.
3rd, the compound method of high-intensity resin blocking agent includes：
Site operation using when appropriate water is first added to 1-5m3In Agitation Tank, silicon is sequentially added under stirring
The stable soil of hydrochlorate, aluminate cement, active bentonite, thermoset phenolic resin, stir, certain viscosity, mobility are made
Suitable high-intensity resin blocking agent.
Henchnmrk test：
(1) measure of kinematic viscosity
The high-intensity resin blocking agent solution 500mL just prepared is inserted in the measuring cylinder of rotation viscometer, at normal temperatures
5min is tested, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 9.
The kinematic viscosity experimental result of the high-intensity resin blocking agent solution of table 9
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 55 | 58 | 60 | 61 | 63 | 65 | 63 | 62 | 59 | 60 |
(2) concreteness, temperature tolerance evaluation
0.42mm-0.60mm reservoir sand 20g are weighed, are mixed into high-intensity resin blocking agent solution, after mixing and fully soaking, dress
Enter in the solid sandpipe of 25mm × 40mm-25mm × 60mm glass, be gently compacted 5min with 40N power after solidification, and be with latus rectum
0.28mm fine screen mesh tangles sand-proof pipe both ends, then is blotted water with vavuum pump, and 100mL water is added in autoclave, sample is hung
In kettle, heating makes temperature in the kettle rise to 300 DEG C, constant temperature 1d, checks consolidation situation, and measurement result is shown in Table 10.
The high-intensity resin blocking agent after solidification is put into autoclave, under the conditions of 350 DEG C, after constant temperature 10d, taken out cold
But, complete to the high-intensity resin blocking agent profile after room temperature observation solidification, measurement result is shown in Table 10.
The breakthrough pressure measurement result of table 10
| High-intensity resin blocking agent | Concreteness | Temperature tolerance |
| G11 | Full consolidation | Concreteness is unchanged |
| G12 | Full consolidation | Concreteness is unchanged |
| G13 | Full consolidation | Concreteness is unchanged |
(3) after heatproof compression strength measure
Under the conditions of 80 DEG C, high-intensity resin blocking agent solution is reversely squeezed into the rock core for measured water phase permeability, is closed
Disengaging port strobe is closed, maintains temperature conditionss constant, makes its solidification, then positive crowded simulation water, makes outlet be communicated with air, with
0.05MPa/min rate of rise lifting entry pressure, untill the port of export flows out the first drop of liquid, inlet pressure now
As breakthrough pressure, it as a result see the table below 11.
The breakthrough pressure measurement result of table 11
| Core numbers | Experimental temperature (DEG C) | Rock core water phase permeability (μm2) | Breakthrough pressure (MPa) |
| 17 | 80 | 0.386 | 11.41 |
| 18 | 80 | 0.515 | 11.02 |
| 19 | 80 | 0.818 | 10.85 |
As can be seen from Table 11, the high-intensity resin blocking agent has higher compression strength, and breakthrough pressure can reach 10Mpa
More than.
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward high-intensity resin blocking agent solution is injected in rock core, put
Enter and taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table
12。
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 12
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 110 | 80 | 0.756 | 0.024 | 96.8 |
| 111 | 80 | 0.918 | 0.032 | 96.5 |
| 112 | 80 | 1.028 | 0.045 | 95.6 |
As can be seen from Table 12, the high-intensity resin blocking agent has preferable shut-off capacity, and sealing ratiod reaches more than 95%.
In the present embodiment anti-channeling it is stifled alter agent and adjust block the computational methods for altering composite slug dosage and be：
W-22-17C well groups turn to drive in September, 2012, and the vapour drives well group and is corresponding with 9 mouthfuls of producing wells, 1 mouthful of closing well, 4 mouthfuls of productions
Well is aqueous all more than 90%, well group day oil-producing only 10.4t.The reason for well group yield declines is analyzed, as vapour drives degree
Improve, injection steam involves inequality, more serious channeling phenomenon be present.
This time profile control generally blocks using full well section, and the well core intersection is 18m, adjusts to block and alters correction radius and be designed as
8.82m, stratum effecive porosity 34.8%, adjustment in direction factor beta are 0.66, and anti-channeling is stifled to alter the total dosage of agent composite slug under
Face formula calculates：
Q=π RRepair 2H Φ β=3.14 × 8.822× 18 × 34.8% × 0.66=1010m3
The volume ratio of the pre- blocking agent of high temperature resistant, reinforcing Gelling Plugging Agent and high-intensity resin blocking agent is 3:6:1, then high temperature resistant is pre- stifled
The amount of agent is 303m3, the amount for strengthening Gelling Plugging Agent is 606m3, the amount of high-intensity resin blocking agent is 101m3。
The present embodiment additionally provides alters agent and carries out adjusting the construction method for blocking and altering, the construction method bag using the anti-channeling is stifled
Include：
Step 1：Stop noting, close steam injection gate, the closed-in time ensures more than 5 days, using former well casing post, by just crowded mode
Connect intelligent pump injection system and well head pipeline, pipeline pressure testing 20MPa, 15min, which are not pierced, not to be leaked to be qualified, tubing valve is opened, to heat
Note positive sewage (clear water can also be used) 20m replaced under normal temperature in well3As prepad fluid, in order to Field In The Steam Injection Wells are cooled down,
Slow down the gelation time of the pre- blocking agent of the high temperature resistant being subsequently implanted into, target zone deep can be entered by ensureing the pre- blocking agent of high temperature resistant of injection
Carry out envelope to alter, while ensure the smooth Safety Injection of site operation；
Step 2：Continuously just squeeze the pre- blocking agent 303m of high temperature resistant3To target zone, displacement control is in 5-10m3/ h, operation pressure control
For system within 12MPa, the pre- blocking agent of high temperature resistant plays guarantor as preposition pre- stifled slug, closure target zone deep vapour/has channeling passage
Protect the effect of follow-up slug；
Step 3：Continuously just squeeze and strengthen Gelling Plugging Agent 606m3To target zone, displacement control is in 5-10m3/ h, operation pressure control
System strengthens Gelling Plugging Agent and is used as middle reinforcing slug, play a part of push, collaboration closure, raising seals what is altered within 12MPa
Effect；
Step 4：Again the positive clear water or sewage 20m replaced under normal temperature in well is noted to heat3, it is anti-replace under normal temperature sewage (
Clear water can be used) 15m3As displacement fluid, it is therefore an objective to the blocking agent in pit shaft is replaced into stratum, and closing well waits solidifying 24h, and require
Upper operation in time, tubing string test in deepened well, if there is blocking agent in pit shaft, rinses, ensures smoothly applying for follow-up slug in time
Work；
Step 5：Act steam injection string in well, lower operating tool string, continuously just squeeze high-intensity resin blocking agent 101m3To purpose
Layer, displacement control is in 10-20m3/ h, operation pressure are controlled within 15MPa, and high-intensity resin blocking agent is as rearmounted sealing section
Plug, sealing effect is primarily served, formation sealing characteristics is stronger into colloid, improves its resistance to gentle resistance to steam flush intensity；
Step 6：Positive sewage (can also use clear water) 5m replaced under normal temperature in most backward heat note well3, it is anti-to replace under normal temperature
Sewage (can also use clear water) 15m3As displacement fluid, it is therefore an objective to replace the blocking agent in pit shaft into stratum, and closing well waits solidifying 6-
8h, and upper operation in time is required, tubing string test in deepened well, and rinse to artificial bottom of a well, if rushing motionless brill is milled to artificial bottom of a well,
Ensure there is no blocking agent in pit shaft, it is desirable to which positive well-flushing returns clear water or sewage, proposes operating tool string, by the lower heat note pipe of thermal recovery scheme requirement
Post completion.
The stifled envelope for altering agent of above-mentioned anti-channeling alters effect：
Anti-channeling prepared by embodiment 1 is stifled to alter agent after the W-22-17C well uses of certain oil field, and anti-channeling is stifled to alter agent total injection rate and be
1010m3, after closure, corresponding producing well is aqueous all below 90%, and well group comprehensive water cut declines 2.54%, and well group is averagely produced daily
Oily 18.85t, the stage accumulative oily 169.29t of increasing, and corresponding producing well wellhead temperature has decline, illustrates the steam injection well channeling
Phenomenon is necessarily contained, effectively have adjusted steam entry profile, improves the sweep efficiency of steam displacement.
Embodiment 2
Present embodiments provide that a kind of anti-channeling is stifled to alter agent, it includes the pre- blocking agent of high temperature resistant as preposition pre- stifled slug, reinforcing
Gelling Plugging Agent strengthens slug, high-intensity resin blocking agent as rearmounted sealing slug triplex slug composition among being used as.
Wherein：
Counted using the gross weight of the pre- blocking agent of high temperature resistant as 100wt%, its raw material includes：Polyacrylamide 0.3wt%, composite thickening
Agent 0.3wt%, sealing agent 5wt%, heat stabilizer 0.03wt%, surplus are that W blocks inject water；
Polyacrylamide is partially hydrolyzed polyacrylamide (PHPA), and its degree of hydrolysis is 30%, and molecular weight is 25,000,000；
Complex thickener is the combination of polyanion cellulose and xanthans, and the two accounts for complex thickener gross weight respectively
60wt% and 40wt%；
Sealing agent is the combination of cotton seed hulls and bark powder, and the two accounts for 68 and 32wt% of sealing agent gross weight respectively；
Heat stabilizer is ammonium chloride.
Counted using the gross weight for strengthening Gelling Plugging Agent as 100wt%, its raw material includes：Polyacrylamide 0.4wt%, composite crosslinking
Agent 0.4wt%, pre-crosslinked gel volume expansion grain 4wt%, reinforcing agent 5wt%, surplus are that W blocks inject water；
Polyacrylamide is partially hydrolyzed polyacrylamide (PHPA), and its degree of hydrolysis is 30%, and molecular weight is 12,000,000；
Multiple crosslinking agent is the compound resin system of paraformaldehyde, 3 mixed cresol and melamine, and three accounts for compound respectively
60wt%, 22wt% and 18wt% of crosslinking agent gross weight；
The product that pre-crosslinked gel volume expansion grain generates for Shenyang Yong Xin Fine Chemical Co., Ltd, solid content >=90%,
Water-absorbent expanding multiple >=8；
Reinforcing agent is the combination of powdered rice hulls and rubber powder, and the two is respectively the 60wt% and 40wt% of reinforcing agent gross weight.
By weight, preparing the raw material of high-intensity resin blocking agent includes：Silicate stable native 60 parts, aluminate cement 8
Part, 5 parts of active bentonite, 15 parts of thermoset phenolic resin, W blocks 100 parts of water of injection；
The stable soil of silicate includes pulverized limestone, flyash and stable fine grained soil, and three is respectively that silicate stablizes native gross weight
42wt%, 36wt% and 22wt%；
Aluminate cement is high-strength ferrous aluminate cement；
Active bentonite includes sodium bentonite, α-sodium olefin sulfonate and redispersable latex powder, and three is respectively activity
Bentonite gross weight 32%, 59wt% and 9wt%；
Redispersable latex powder is the copolymer of ethylene/vinyl acetate.
Also, the volume ratio of the pre- blocking agent of high temperature resistant, reinforcing Gelling Plugging Agent and high-intensity resin blocking agent is 3:5:2.
The present embodiment additionally provides the stifled compound method for altering agent of above-mentioned anti-channeling：
1st, the stifled compound method for altering the pre- blocking agent of high temperature resistant in agent of the anti-channeling that the present embodiment provides includes：
Site operation using when appropriate water is first added to 8-10m3In Agitation Tank, polypropylene is added under stirring
Acid amides it is to be mixed uniformly after, sequentially add complex thickener, sealing agent, heat stabilizer, stir, be made certain viscosity, stream
The suitable pre- blocking agent of high temperature resistant of dynamic property.
Henchnmrk test：
(1) measure of kinematic viscosity
The pre- blocking agent solution 500mL of the high temperature resistant just prepared is inserted in the measuring cylinder of rotation viscometer, surveyed at normal temperatures
5min is tried, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 13.
The kinematic viscosity experimental result of the pre- blocking agent solution of the high temperature resistant of table 13
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 56 | 58 | 60 | 62 | 65 | 68 | 66 | 65 | 63 | 60 |
(2) measure of colloid viscosity
The pre- blocking agent solution 500mL of high temperature resistant after formation cross-linking system is inserted in the measuring cylinder of rotation viscometer, 80
5min is tested under the conditions of DEG C, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 14.
The colloid viscosity experiment result of the pre- blocking agent solution of the high temperature resistant of table 14
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 8896 | 9432 | 10015 | 10658 | 11375 | 11789 | 11159 | 10725 | 10008 | 10246 |
(3) heatproof estimation of stability
By the pre- blocking agent solution of high temperature resistant after formation cross-linking system, it is divided into 6 parts by every part of 500mL, pours into sealing steel respectively
It is placed on after bottle in constant temperature oven, under the conditions of 200 DEG C, after constant temperature 10d, taking-up portion is surveyed it by the assay method of colloid viscosity and glued
Angle value N (1), portion is taken out per 10d later and surveys its viscosity number N (2), N (3), N (4), N (5), N (6) respectively, takes its minimum value to be
Viscosity retention ratio measurement result, is shown in Table 15.
Viscosity retention ratio is calculated as follows：
R (i)=N (i) × 100/N (0)
In formula：I=1-6；
R(i)：Viscosity retention ratio, represented (%) with percentage；
N(0)：The pre- blocking agent initial-viscosity number of high temperature resistant, unit are mpas (mPas)
N(i)：Viscosity number after the pre- blocking agent heatproof of high temperature resistant, unit are mpas (mPas).
The colloid viscosity experiment result of the pre- blocking agent solution of the high temperature resistant of table 15
| Time, d | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Viscosity, mPas | 10386 | 9687 | 9458 | 9269 | 8975 | 8618 | 8325 |
By the pre- blocking agent of above-mentioned high temperature resistant at 200 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention ratio >=80.2%.
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward the pre- blocking agent solution of high temperature resistant is injected in rock core, be put into
Taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table 16.
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 16
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 21 | 80 | 0.752 | 0.028 | 96.3 |
| 22 | 80 | 0.912 | 0.04 | 95.6 |
| 23 | 80 | 1.022 | 0.039 | 96.2 |
As can be seen from Table 16, the pre- blocking agent of the high temperature resistant has preferable shut-off capacity, and sealing ratiod reaches more than 95%.
2nd, the stifled compound method for altering reinforcing Gelling Plugging Agent in agent of the anti-channeling that the present embodiment provides includes：
Site operation using when appropriate water is first added to 8-10m3In Agitation Tank, polypropylene is added under stirring
Acid amides it is to be mixed uniformly after, sequentially add multiple crosslinking agent, pre-crosslinked gel volume expansion grain, reinforcing agent, stir, be made one
Determine the suitable reinforcing Gelling Plugging Agent of viscosity, mobility.
Henchnmrk test：
(1) measure of kinematic viscosity
The reinforcing Gelling Plugging Agent solution 500mL just prepared is inserted in the measuring cylinder of rotation viscometer, surveyed at normal temperatures
5min is tried, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 17.
Table 17 strengthens the kinematic viscosity experimental result of Gelling Plugging Agent solution
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 86 | 88 | 91 | 94 | 96 | 99 | 97 | 95 | 96 | 98 |
(2) measure of colloid viscosity
Reinforcing Gelling Plugging Agent solution 500mL is inserted in the measuring cylinder of rotation viscometer after cross-linking system will be formed, at 80 DEG C
Under the conditions of test 5min, during which per 0.5min read a numerical value, it is measurement result to take its average value, is shown in Table 18.
Table 18 strengthens the colloid viscosity experiment result of Gelling Plugging Agent solution
| Time, min | Viscosity, mPas | Time, min | Viscosity, mPas |
| 0.5 | 108435 | 3 | 112026 |
| 1 | 109218 | 3.5 | 111398 |
| 1.5 | 110037 | 4 | 110586 |
| 2 | 111065 | 4.5 | 110017 |
| 2.5 | 111915 | 5 | 109271 |
(3) heatproof estimation of stability
By the reinforcing Gelling Plugging Agent solution after formation cross-linking system, it is divided into 6 parts by every part of 500mL, pours into sealing steel respectively
It is placed on after bottle in constant temperature oven, under the conditions of 300 DEG C, after constant temperature 10d, taking-up portion is surveyed it by the assay method of colloid viscosity and glued
Angle value N (1), portion is taken out per 10d later and surveys its viscosity number N (2), N (3), N (4), N (5), N (6) respectively, takes its minimum value to be
Viscosity retention ratio measurement result, is shown in Table 19.
Viscosity retention ratio is calculated as follows：
R (i)=N (i) × 100/N (0)
In formula：
I=1-6；
R(i)：Viscosity retention ratio, represented (%) with percentage；
N(0)：Strengthen Gelling Plugging Agent initial-viscosity number, unit is mpas (mPas)
N(i)：Viscosity number after reinforcing Gelling Plugging Agent heatproof, unit is mpas (mPas).
Table 19 strengthens the colloid viscosity experiment result of Gelling Plugging Agent solution
| Time, d | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Viscosity, mPas | 109568 | 107262 | 105695 | 103858 | 98957 | 90528 | 84515 |
By above-mentioned reinforcing Gelling Plugging Agent at 300 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention ratio >=77.1%.
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward injection reinforcing Gelling Plugging Agent solution in rock core, be put into
Taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table 20.
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 20
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 24 | 80 | 0.876 | 0.033 | 96.2 |
| 25 | 80 | 1.052 | 0.044 | 95.8 |
| 26 | 80 | 1.219 | 0.054 | 95.6 |
As can be seen from Table 20, the reinforcing Gelling Plugging Agent has preferable shut-off capacity, and sealing ratiod reaches more than 95%.
3rd, the stifled compound method for altering high-intensity resin blocking agent in agent of the anti-channeling that the present embodiment also provides includes：
Site operation using when appropriate water is first added to 1-5m3In Agitation Tank, silicon is sequentially added under stirring
The stable soil of hydrochlorate, aluminate cement, active bentonite, thermoset phenolic resin, stir, certain viscosity, mobility are made
Suitable high-intensity resin blocking agent.
Henchnmrk test：
(1) measure of kinematic viscosity
The high-intensity resin blocking agent solution 500mL just prepared is inserted in the measuring cylinder of rotation viscometer, at normal temperatures
5min is tested, a numerical value is during which read per 0.5min, it is measurement result to take its average value, is shown in Table 21.
The kinematic viscosity experimental result of the high-intensity resin blocking agent solution of table 21
| Time, min | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| Viscosity, mPas | 52 | 55 | 58 | 60 | 62 | 63 | 61 | 59 | 57 | 58 |
(2) concreteness, temperature tolerance evaluation
0.42mm-0.60mm reservoir sand 20g are weighed, are mixed into high-intensity resin blocking agent solution, after mixing and fully soaking, dress
Enter in the solid sandpipe of 25mm × 40mm-25mm × 60mm glass, be gently compacted 5min with 40N power after solidification, and be with latus rectum
0.28mm fine screen mesh tangles sand-proof pipe both ends, then is blotted water with vavuum pump, and 100mL water is added in autoclave, sample is hung
In kettle, heating makes temperature in the kettle rise to 300 DEG C, constant temperature 1d, checks consolidation situation, and measurement result is shown in Table 22.
The high-intensity resin blocking agent after solidification is put into autoclave, under the conditions of 350 DEG C, after constant temperature 10d, taken out cold
But, complete to the high-intensity resin blocking agent profile after room temperature observation solidification, measurement result is shown in Table 22.
The breakthrough pressure measurement result of table 22
| High-intensity resin blocking agent | Concreteness | Temperature tolerance |
| G21 | Full consolidation | Concreteness is unchanged |
| G22 | Full consolidation | Concreteness is unchanged |
| G23 | Full consolidation | Concreteness is unchanged |
(3) after heatproof compression strength measure
Under the conditions of 80 DEG C, high-intensity resin blocking agent solution is reversely squeezed into the rock core for measured water phase permeability, is closed
Disengaging port strobe is closed, maintains temperature conditionss constant, makes its solidification, then positive crowded simulation water, makes outlet be communicated with air, with
0.05MPa/min rate of rise lifting entry pressure, untill the port of export flows out the first drop of liquid, inlet pressure now
As breakthrough pressure, it as a result see the table below 23.
The breakthrough pressure measurement result of table 23
| Core numbers | Experimental temperature (DEG C) | Rock core water phase permeability (μm2) | Breakthrough pressure (MPa) |
| 27 | 80 | 0.415 | 11.35 |
| 28 | 80 | 0.568 | 11.06 |
| 29 | 80 | 0.836 | 10.78 |
As can be seen from Table 23, the high-intensity resin blocking agent has higher compression strength, breakthrough pressure reach 10Mpa with
On.
(4) sealing ratiod performance evaluation
Sealing ratiod is the rock core difference of permeability and permeability ratio before pass blocking agent before and after the pass blocking agent, is characterized with this
The plugging effect of blocking agent.
Its assay method is to connect rock core test instrument according to flow, installs rock core, first evacuates rock core, with stratum water drive
After liquid saturation, determine before the closure of rock core after water phase permeability K1, then toward high-intensity resin blocking agent solution is injected in rock core, put
Enter and taken out after placing 10d in 80 DEG C of water-baths, water phase permeability K2 after measure closure, calculate sealing ratiod according to below equation, be shown in Table
24。
X=(1-K2/K1) × 100
X：Sealing ratiod, represented (%) with percentage；
K1：Permeability before reservoir core plugging, unit be millidarcy (μm2)；
K2：Permeability after reservoir core plugging, unit be millidarcy (μm2)；
The rock core measurement result of table 24
| Core numbers | Experimental temperature (DEG C) | Permeability before stifled (μm2) | Permeability after stifled (μm2) | Sealing ratiod (%) |
| 210 | 80 | 0.716 | 0.024 | 96.6 |
| 211 | 80 | 0.885 | 0.034 | 96.2 |
| 212 | 80 | 1.006 | 0.045 | 95.5 |
As can be seen from Table 24, the high-intensity resin blocking agent has preferable shut-off capacity, and sealing ratiod reaches more than 95%.
In the present embodiment anti-channeling it is stifled alter agent and adjust block the computational methods for altering composite slug dosage and be：
W-20-15 vapour drives well group and is corresponding with 8 mouthfuls of producing wells, and due to 2 mouthfuls of High water cut closing well, 6 mouthfuls of producing wells are aqueous all to exist
More than 90%, wherein having, 3 mouthfuls of well temperature are higher, well group day only 12 tons of oil-producing.Illustrate the steam injection well vapour drive involve inequality, exist compared with
For serious channeling phenomenon, the steam of injection is caused to cause well water to raise along hypertonic laminar flow, and middle hyposmosis is also big
The remaining oil of amount do not feed through to or involve not thoroughly, there are very big potentiality to dig.
This time profile control generally blocks using full well section, and the well core intersection is 20.1m, adjusts to block and alters correction radius and be designed as
8.98m, stratum effecive porosity 25.2%, adjustment in direction factor beta are 0.79, and anti-channeling is stifled to alter the total dosage of agent composite slug under
Face formula calculates：
Q=π RRepair 2H Φ β=3.14 × 8.982× 20.1 × 25.2% × 0.79=1013m3
The volume ratio of the pre- blocking agent of high temperature resistant, reinforcing Gelling Plugging Agent and high-intensity resin blocking agent is 3:5:2, then high temperature resistant is pre- stifled
The amount of agent is 304m3, the amount for strengthening Gelling Plugging Agent is 506m3, the amount of high-intensity resin blocking agent is 203m3。
The present embodiment additionally provides alters agent and carries out adjusting the construction method for blocking and altering, the construction method bag using the anti-channeling is stifled
Include：
Step 1：Stop noting, close steam injection gate, the closed-in time ensures more than 5 days, using former well casing post, by just crowded mode
Connect intelligent pump injection system and well head pipeline, pipeline pressure testing 20MPa, 15min, which are not pierced, not to be leaked to be qualified, tubing valve is opened, to heat
The positive sewage replaced under normal temperature (can also be used clear water, but can realize recycling for sewage, the present embodiment using sewage in note well
In it is other use sewage place be also in order at identical consideration) 20m3As prepad fluid, in order to cool down Field In The Steam Injection Wells, subtract
The gelation time of the slow pre- blocking agent of high temperature resistant being subsequently implanted into, ensureing the pre- blocking agent of high temperature resistant of injection can enter into target zone deep
Row envelope is altered, while ensures the smooth Safety Injection of site operation；
Step 2：Continuously just squeeze the pre- blocking agent 304m of high temperature resistant3To target zone, displacement control is in 5-10m3/ h, operation pressure control
For system within 12MPa, the pre- blocking agent of high temperature resistant plays guarantor as preposition pre- stifled slug, closure target zone deep vapour/has channeling passage
Protect the effect of follow-up slug；
Step 3：Continuously just squeeze and strengthen Gelling Plugging Agent 506m3To target zone, displacement control is in 5-10m3/ h, operation pressure control
System strengthens Gelling Plugging Agent and is used as middle reinforcing slug, play a part of push, collaboration closure, raising seals what is altered within 12MPa
Effect；
Step 4：Again the positive sewage 20m replaced under normal temperature in well is noted to heat3, the anti-sewage 30m replaced under normal temperature3As top
For liquid, it is therefore an objective to the blocking agent in pit shaft is replaced into stratum, and closing well waits solidifying 24h, and upper operation in time is required, in deepened well
Tubing string test, if there is blocking agent in pit shaft, rinse in time, ensure the smooth construction of follow-up slug；
Step 5：Act steam injection string in well, lower operating tool string, continuously just squeeze high-intensity resin blocking agent 203m3To purpose
Layer, displacement control is in 10-20m3/ h, operation pressure are controlled within 15MPa, and high-intensity resin blocking agent is as rearmounted sealing section
Plug, sealing effect is primarily served, formation sealing characteristics is stronger into colloid, improves its resistance to gentle resistance to steam flush intensity；
Step 6：The positive sewage 5m replaced under normal temperature in most backward heat note well3, the anti-sewage 15m replaced under normal temperature3As
Displacement fluid, it is therefore an objective to the blocking agent in pit shaft is replaced into stratum, and closing well waits solidifying 6-8h, and upper operation in time is required, deepen
Tubing string test in well, and rinse to artificial bottom of a well, if rushing motionless brill is milled to artificial bottom of a well, ensure there is no blocking agent in pit shaft, it is desirable to
Positive well-flushing returns clear water or sewage, proposes operating tool string, by the lower heat note tubing string completion of thermal recovery scheme requirement.
The stifled envelope for altering agent of above-mentioned anti-channeling alters effect：
Anti-channeling prepared by embodiment 2 is stifled to alter agent after the W-20-15 well uses of certain oil field, and anti-channeling is stifled to alter agent total injection rate and be
1013m3, after closure, corresponding producing well has 4 mouthfuls of well comprehensive water cuts below 90%, under other 2 mouthfuls of producing well comprehensive water cuts also have
Drop, well group comprehensive water cut decline 4.73%, well group average day oil-producing 13.8t, the stage accumulative oily 558.38t of increasing, and corresponding life
Production well wellhead temperature has decline, illustrates that the steam injection well channeling phenomenon is necessarily contained, effectively have adjusted steam entry profile, improves
The sweep efficiency of steam displacement.
Claims (22)
1. a kind of anti-channeling is stifled to alter agent, wherein, the anti-channeling is stifled, which to alter agent, includes the pre- blocking agent of high temperature resistant, strengthens Gelling Plugging Agent and high intensity tree
Fat blocking agent；
Counted using the gross weight of the raw material of the pre- blocking agent of the high temperature resistant as 100wt%, preparing the raw material of the pre- blocking agent of the high temperature resistant includes：It is poly-
Acrylamide 0.1-0.4wt%, complex thickener 0.1-0.3wt%, sealing agent 3-6wt%, heat stabilizer 0.02-
0.05wt%, surplus are water；
Counted using the gross weight of the raw material of the reinforcing Gelling Plugging Agent as 100wt%, preparing the raw material of the reinforcing Gelling Plugging Agent includes：It is poly-
Acrylamide 0.2-0.6wt%, multiple crosslinking agent 0.1-0.4wt%, pre-crosslinked gel volume expansion grain 3-6wt%, reinforcing agent 2-
5wt%, surplus are water；
In parts by weight, preparing the raw material of the high-intensity resin blocking agent includes：Silicate stablizes native 50-70 parts, aluminic acid salt solution
Mud 6-10 parts, active bentonite 3-5 parts, thermoset phenolic resin 10-20 parts and water 100-120 parts.
2. anti-channeling as claimed in claim 1 is stifled to alter agent, wherein, it is the pre- blocking agent of the high temperature resistant, the reinforcing Gelling Plugging Agent, described
The volume ratio of high-intensity resin blocking agent three is 2-4:5-7:1-2.
3. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the polyacrylamide
For partially hydrolyzed polyacrylamide (PHPA)；
The complex thickener is the one or more in polyanion cellulose, xanthans, polyacrylamide and modified starch
Combination,
The sealing agent is one or more combinations in cotton seed hulls, rice chaff, sawdust, walnut shell and bark powder,
The heat stabilizer is inorganic salts.
4. anti-channeling as claimed in claim 3 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the partial hydrolysis poly- third
The degree of hydrolysis of acrylamide is 15%-30%, and molecular weight is 15,000,000-2,500 ten thousand.
5. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the complex thickener
For the combination of polyanion cellulose and xanthans.
6. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the sealing agent is cotton
The combination of seed shell and bark powder.
7. anti-channeling as claimed in claim 3 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the inorganic salts are chlorination
One or more combinations in ammonium, sodium chloride and potassium chloride.
8. anti-channeling as claimed in claim 3 is stifled to alter agent, wherein, in the pre- blocking agent of the high temperature resistant, the inorganic salts are chlorination
Ammonium.
9. anti-channeling as claimed in claim 3 is stifled to alter agent, wherein, the complex thickener is polyanion cellulose and xanthans
Combination, the two accounts for the 50-65wt% and 35-50wt% of complex thickener gross weight respectively；
The sealing agent is the combination of cotton seed hulls and bark powder, and the two accounts for the 60-75wt% and 25- of sealing agent gross weight respectively
40wt%.
10. anti-channeling as claimed in claim 3 is stifled to alter agent, wherein, the complex thickener is polyanion cellulose and xanthan
The combination of glue, the two accounts for the 55-60wt% and 40-45wt% of complex thickener gross weight respectively；
The sealing agent is the combination of cotton seed hulls and bark powder, and the two accounts for the 65-70wt% and 30- of sealing agent gross weight respectively
35wt%.
11. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the reinforcing Gelling Plugging Agent, the polyacrylamide
Amine is partially hydrolyzed polyacrylamide (PHPA)；
The multiple crosslinking agent is the compound resin system of aldehydes, phenols and melamine；
Solid content >=90% of the pre-crosslinked gel volume expansion grain, water-absorbent expanding multiple >=8；
The reinforcing agent is one or more combinations in rubber powder, bark powder, rice chaff, rice husk and sawdust.
12. anti-channeling as claimed in claim 11 is stifled to alter agent, wherein, in the reinforcing Gelling Plugging Agent, the partial hydrolysis gathers
The degree of hydrolysis of acrylamide is 15%-30%, and molecular weight is 12,000,000-1,600 ten thousand.
13. anti-channeling as claimed in claim 11 is stifled to alter agent, wherein, counted using multiple crosslinking agent gross weight as 100wt%, aldehydes, phenol
Class and melamine account for 55-70wt%, 15-35wt% and 10-30wt% of gross weight respectively；
The reinforcing agent is the combination of rice husk and rubber powder, is counted using reinforcing agent gross weight as 100wt%, the two is respectively gross weight
55-70wt% and 30-45wt%.
14. anti-channeling as claimed in claim 11 is stifled to alter agent, wherein, counted using multiple crosslinking agent gross weight as 100wt%, aldehydes, phenol
Class and melamine account for 60-65wt%, 20-30wt% and 15-25wt% of gross weight respectively；
The reinforcing agent is the combination of rice husk and rubber powder, is counted using reinforcing agent gross weight as 100wt%, the two is respectively gross weight
60-65wt% and 35-40wt%.
15. the anti-channeling as described in claim 13 or 14, which is blocked up, alters agent, wherein, the aldehydes is paraformaldehyde, formaldehyde, furfural and crow
One or more combinations in the tropine of Lip river；
The phenols is one or more combinations in 3 mixed cresol, resorcinol and phenol.
16. the anti-channeling as described in claim 13 or 14, which is blocked up, alters agent, wherein, the aldehydes is paraformaldehyde；The phenols is three
Mixture cresol.
17. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the high-intensity resin blocking agent, the silicate
Stable soil includes pulverized limestone, flyash and stable fine grained soil, stablizes native gross weight using silicate and is counted as 100wt%, three is respectively
Silicate stablizes 30-50wt%, 25-45wt% and 15-30wt% of native gross weight；
The aluminate cement is one in high-strength sulphate aluminium cement, expansion sulphate aluminium cement and high-strength ferrous aluminate cement
Kind or a variety of combinations；
The active bentonite includes sodium bentonite, α-sodium olefin sulfonate and redispersable latex powder, total with active bentonite
Weight is counted for 100wt%, and three is respectively 25-40wt%, 50-65wt% and 6-12wt% of active bentonite gross weight.
18. anti-channeling as claimed in claim 1 or 2 is stifled to alter agent, wherein, in the high-intensity resin blocking agent, the silicate
Stable soil includes pulverized limestone, flyash and stable fine grained soil, stablizes native gross weight using silicate and is counted as 100wt%, three is respectively
Silicate stablizes 35-45wt%, 30-40wt% and 20-25wt% of native gross weight；
The aluminate cement is high-strength ferrous aluminate cement；
The active bentonite includes sodium bentonite, α-sodium olefin sulfonate and redispersable latex powder, total with active bentonite
Weight is counted for 100wt%, and three is respectively 30-35wt%, 55-60wt% and 8-10wt% of active bentonite gross weight.
19. anti-channeling as claimed in claim 18 is stifled to alter agent, wherein, in the stable soil of the silicate, the pulverized limestone is calcium
Matter pulverized limestone, the flyash are the sial flyash that the mass percent of calcium oxide is 2%-6%, in the stable fine grained soil
Size≤15mm of maximum soil block, mass percent≤10% of organic matter,
In the active bentonite, the redispersable latex powder is the copolymer of ethylene/vinyl acetate, vinyl acetate/
One or more combinations in versatic acid ethylene copolymer and acrylic copolymer.
20. anti-channeling as claimed in claim 17 is stifled to alter agent, wherein, the stable fine grained soil is that plasticity index is the viscous of 12-20
Property soil.
21. a kind of anti-channeling using described in claim any one of 1-20 is stifled to alter agent and carry out adjusting the construction method for blocking and altering, this is applied
Work method comprises the following steps：
First the clear water injected in well under normal temperature or sewage are noted or adopted as prepad fluid, high temperature resistant is then injected into target zone to heat
Pre- blocking agent forms preposition pre- stifled slug, reinjects reinforcing Gelling Plugging Agent and forms middle reinforcing slug, normal temperature is then injected into well
Under clear water or sewage wait solidifying 24h-48h as displacement fluid and closing well, then after high-intensity resin blocking agent injection target zone is formed
Sealing slug is put, the clear water injected in well under normal temperature or sewage are noted or adopted to most backward heat as displacement fluid, and closing well waits solidifying 6-8h.
22. anti-channeling according to claim 21 is stifled to alter agent and carries out adjusting the construction method for blocking and altering, wherein, noted into target zone
Discharge capacity when entering the pre- blocking agent of the high temperature resistant is 5-10m3/ h, operation pressure are within 15MPa；Injected into target zone described strong
Discharge capacity when changing Gelling Plugging Agent is 5-10m3/ h, operation pressure are within 15MPa；The reinforcing gel is injected into target zone to block up
Discharge capacity during agent is 10-20m3/ h, operation pressure are within 20MPa.
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| CN104120999A (en) * | 2014-07-03 | 2014-10-29 | 中国石油大学(北京) | Oil recovery method restraining channeling in CO2 flooding process in low-permeability fractured reservoir through two-stage channeling blocking |
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