CN109294541A - A kind of fireflood well self-degradation diverting agent and the preparation method and application thereof - Google Patents
A kind of fireflood well self-degradation diverting agent and the preparation method and application thereof Download PDFInfo
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- CN109294541A CN109294541A CN201811113327.4A CN201811113327A CN109294541A CN 109294541 A CN109294541 A CN 109294541A CN 201811113327 A CN201811113327 A CN 201811113327A CN 109294541 A CN109294541 A CN 109294541A
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- C—CHEMISTRY; METALLURGY
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- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
Abstract
The present invention provides a kind of fireflood well self-degradation diverting agents and the preparation method and application thereof, are in terms of 100% by the total weight of the fireflood well self-degradation diverting agent, the raw material for preparing the fireflood well self-degradation diverting agent includes: host agent 0.3-0.8%；Crosslinking agent 0.01-0.05%；Oil-soluble resin 0.5-2%；Fiber grain 0.2-0.6%；Heat stabilizer 0.02-0.1%；Fungicide 0.1-0.5%；Cleanup additive 0.2-0.6%；Fluid loss additive 1-3%；Slow-release 0.001-0.004%；And the water of surplus.The fireflood well self-degradation diverting agent has good being pumped into property, temperature tolerance, preparation is simple, the features such as low in cost, and gel breaking time is adjustable, shut-off capacity is strong, and adaptation Oil Reservoir Types are wide, is not easy to pollute stratum, it is able to enter earth formation deep, can effectively solve fireflood producing well gas production causes greatly operation difficulty etc. to produce problem.
Description
Technical field
The present invention relates to a kind of fireflood well self-degradation diverting agents and the preparation method and application thereof, belong to oil field development technology neck
Domain.
Background technique
Acted on when fireflood well workover by fireflood effect, block plane connection situation is complicated, has channeling serious interference, wellbore pressure without
Method is let out to the greatest extent, and preparation of construction time comparison open well averagely increases by 5 days or more, seriously affects well workover efficiency and production time efficiency.In the past
The means taken are with salt water kill-job and to use powder diverting agent, but have certain technical limitation.Specifically, using
Since reservoir pressure coefficient is low, well killing fluid leakage is serious for salt water kill-job, and stratum can not establish balance, and it is excessive to inject well killing fluid
Stratum can also be polluted.Although preferable using powder diverting agent kill-job plugging effect, under fireflood region pump sump and
There is holddown phenomenon after driving a well on inspection pump sump.
In response to this series of problems, shielding diverting agent and temporary plugging technique are developed both at home and abroad in recent years, is mainly utilized
Water-soluble polymer frozen glue, acid-soluble particles, high molecular material to borehole wall perforated interval shield it is temporarily stifled after, then carry out inspection pump or
The operations such as tubing string are examined, so that Operating Pressure bring security risk and operating cost be avoided to rise, but there is problems: one
It is the duct that water-soluble polymer gelled plugging agent often preferentially enters not oil-containing, even if entering oil-containing duct on a small quantity, it is difficult to voluntarily
De-plugging causes in-place permeability to decline, and cannot effectively block to borehole, near wellbore formation band.Second is that acid-soluble diverting agent
Predominantly CaCO3Class product is needed after operation using acid solution de-plugging, and acid solution injection can not only generate injury to reservoir, also
Increase flow chart and construction operation cost.Third is that macromolecule diverting agent material, using more, temporarily stifled effect is good, but de-plugging is tired
Difficulty injures low porosity and low permeability oil field larger.
Therefore it provides a kind of fireflood well self-degradation diverting agent and the preparation method and application thereof has become this field and needs to solve
Certainly the technical issues of.
Summary of the invention
In order to solve the above shortcomings and deficiencies, the purpose of the present invention is to provide a kind of fireflood well self-degradation diverting agents.
The object of the invention is also to provide the preparation methods of the fireflood well self-degradation diverting agent.
The object of the invention is also to provide above-mentioned fireflood well self-degradation diverting agents to examine pump or inspection tubing string operation in fireflood well
In application.
In order to achieve the above objectives, on the one hand, the present invention provides a kind of fireflood well self-degradation diverting agent, wherein with the fire
The total weight for driving well self-degradation diverting agent is 100% meter, and the raw material for preparing the fireflood well self-degradation diverting agent includes:
Host agent 0.3-0.8%；
Crosslinking agent 0.01-0.05%；
Oil-soluble resin 0.5-2%；
Fiber grain 0.2-0.6%；
Heat stabilizer 0.02-0.1%；
Fungicide 0.1-0.5%；
Cleanup additive 0.2-0.6%；
Fluid loss additive 1-3%；
Slow-release 0.001-0.004%；
And the water of surplus.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the fireflood well self-degradation
Diverting agent is prepared using the preparation method included the following steps:
(1) host agent is added to the water, dissolution is sufficiently stirred, obtains solution A；
(2) into solution A be added fungicide, oil-soluble resin, fiber grain, heat stabilizer, cleanup additive, fluid loss additive,
Slow-release obtains solution B；
(3) after agitating solution B keeps combined hybrid therein uniform, crosslinking agent is added and continues to stir to prevent partial cross-linking,
Obtain the fireflood well self-degradation diverting agent.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the host agent includes industry
The combination of grade super guanidine gum or one or both of hydroxypropyl guar gum.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the crosslinking agent includes boron
The combination of one or both of sand or organoboron compound.
Wherein, organic boron used in the present invention is conventional substances, can pass through commercially available or this field customary preparation methods system
Standby to obtain, the organic boron is to utilize borate (such as Na in the specific embodiment of the invention2B4O7) and organic ligand (such as LGD
(OH)6) the stable organic complex that is formed under chemical assistant effect.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the oil-soluble resin
Partial size is 0.1-2mm.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the oil-soluble resin packet
Include the combination of one or more of alkyd resin, acrylic resin and synthctic fat acid resin.
The temporary stifled principle of oil-soluble resin is: encountering leakage channel to during formation leakage, temporarily stifled material is attached in duct
It is close to form shielding temporarily blocking layer, it prevents liquid that stratum is further descended to leak, guarantees smoothly completing and pit shaft being prevented for workover treatment
In outside fluid intrusion polluted reservoir or temporary closure is realized to stratum, avoid fireflood gas well gas from altering the influence to operation,
Guarantee that operation is gone on smoothly, crude oil resumes production after the completion of operation, and temporarily stifled material is dissolved by crude oil, temporarily blocking layer de-plugging, and production is logical
Road is unimpeded.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the fibre of the fiber grain
Dimension length is 3-15mm, and fibre tensile strength 20-800MPa, fibre diameter is 10-100 μm.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the fiber grain includes
The combination of one or more of vinal, modified polyester fiber, polyurethane fiber.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the heat stabilizer includes
The combination of one or both of -2 methyl propane sulfonic acid of 2- acrylamido, sodium thiosulfate.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the fungicide includes first
The combination of one or both of aldehyde or methenamine.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the cleanup additive includes poly-
Oxygen ethyl alkyl phenyl ether, polyoxyethanyl alkyl ether, polyoxyethanyl fatty acid ether-ether, one in dodecyl trimethyl ammonium chloride
Kind or several combinations.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the fluid loss additive is low
Resulting mixture after viscosity carboxymethyl cellulose sodium and hydrolyzed polyacrylonitrile ammonium salt are mixed according to the mass ratio of 1:2-2:1；
Preferably, the fluid loss additive is low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt according to 1:1's
Resulting mixture after mass ratio mixing.
Wherein, low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt used herein is conventional substances,
It can be commercially available, the viscosity of low-viscosity sodium carboxymethyl cellulose is less than 1000mPas.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the slow-release is
Biological enzyme.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the biological enzyme is main
Ingredient is the biological enzyme of galactomannans enzyme.
Specific embodiment according to the present invention, in the fireflood well self-degradation diverting agent, the biological enzyme is rich for enzyme
Scholar Dr.Nzyme200.
Wherein, biological enzyme used herein is conventional substances, can be commercially available, such as in specific embodiment party of the present invention
In formula, enzyme doctor Dr.Nzyme200 used is purchased from Dalian Biteomics Technology, Inc.'s product produced.
On the other hand, the present invention also provides the preparation methods of the fireflood well self-degradation diverting agent comprising following
Step:
(1) host agent is added to the water, dissolution is sufficiently stirred, obtains solution A；
(2) into solution A be added fungicide, oil-soluble resin, fiber grain, heat stabilizer, cleanup additive, fluid loss additive,
Slow-release obtains solution B；
(3) after agitating solution B keeps combined hybrid therein uniform, crosslinking agent is added and continues to stir to prevent partial cross-linking,
Obtain the fireflood well self-degradation diverting agent.
Specific embodiment according to the present invention, the preparation method further include the fungicide is configured to mass concentration (with
The total weight of the aqueous solution is 100% to be calculated) aqueous solution that be 37-40%, then by the behaviour in aqueous solution addition solution A
Make.
Specific embodiment according to the present invention, in the preparation method, in step (1), the temperature of the water is not high
In 50 DEG C.
Specific embodiment according to the present invention, in the preparation method, in step (1), the water include clear water, from
Water or oilfield sewage.
Specific embodiment according to the present invention, in the preparation method, the stirring is with the speed of 50-200r/min
Degree stirring 10-15min.
Specific embodiment according to the present invention, in the preparation method step (2), it is necessary first to add into solution A
Enter fungicide, is eventually adding slow-release；The present invention filters oil-soluble resin, fiber grain, heat stabilizer, cleanup additive, drop
The addition sequence for losing those substances of agent does not do specific requirement, and those skilled in the art can need to reasonably adjust this according to field operation
The addition sequence of a little substances, as long as guaranteeing that the purpose of the present invention can be achieved.
Specific embodiment according to the present invention needs to continue in the preparation method step (3) after crosslinking agent is added
Stirring is to prevent partial cross-linking, and then it is incomplete to can avoid diverting agent plastic.
Another aspect, the present invention also provides application of the fireflood well self-degradation diverting agent in fireflood well temporarily blocks up.
Wherein, it can effectively avoid offset well has channeling using the fireflood well self-degradation diverting agent in the application process and pump examined to fireflood producing well
The influence of equal operations.
After tested, up to 90% or more, heatproof is up to the sealing ratiod of fireflood well self-degradation diverting agent provided by the invention
150 DEG C, validity period is up to 3d or more；The diverting agent is lower than 11% to core permeability injury rate；Viscosity is 8000- after plastic
15000mPas, plugging strength is up to 15MPa/m or more.The fireflood well self-degradation diverting agent has good being pumped into property, heatproof
Property, long-term effectiveness, preparation is simple, it is low in cost the features such as, and shut-off capacity is strong, and it is wide to adapt to Oil Reservoir Types, not easy to pollute
Stratum, can effectively avoid fireflood producing well inspection pump or inspection tubing string gas production can not play greatly the production problem such as lower tubular column.
Fireflood well self-degradation diverting agent provided by the invention and its application in the operations such as fireflood well inspection pump or inspection tubing string
Have the beneficial effect that 1, oil-soluble particle because of its oil solution ratio height, is easy anti-row, easy for construction, formation damage is small, is suitble to differently
Layer temperature；Oil-soluble particle (oil-soluble resin particle) particle size distribution range is wide, can to different permeabilities operation well realization have
Effect blocks；2, dissolution rate is high in crude oil, is able to achieve under formation condition and voluntarily dissolves, does not pollute to stratum, seep stratum
Saturating rate is restored rapidly；3, particle can not only carry out oil-layer blasthole effectively temporarily stifled, moreover it is possible to have to macropore exhalant canal
Effect blocks, and reduces formation water output, is released effectively the oil productive capacity of low permeability formation, reaches decreasing water cut and increasing oil effect.With other temporarily stifled sides
Method is compared, and this method has many advantages, such as small, the high-efficient, simple process of injury, practical.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now in conjunction in detail below
Embodiment carries out following detailed description to technical solution of the present invention, but should not be understood as the limit to enforceable range of the invention
It is fixed.
Embodiment 1
A kind of fireflood well self-degradation diverting agent is present embodiments provided, with the total weight of the fireflood well self-degradation diverting agent
For 100% meter, the raw material for preparing the fireflood well self-degradation diverting agent includes:
Technical grade super guanidine gum 0.3%；
Borax 0.01%；
Alkyd resin (partial size 0.1mm) 0.5%；
Vinal (fibre length 3mm, fibre tensile strength 20MPa, fibre diameter are 10 μm) 0.2%；
- 2 methyl propane sulfonic acid 0.02% of 2- acrylamido；
Formaldehyde 0.1%；
Polyoxyethanyl alkyl phenyl ether 0.2%；
Low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are that 1:1 mixes resulting mixed liquor in mass ratio
1%；
Enzyme doctor Dr.Nzyme200 (galactomannans enzyme) 0.001%；
And the oilfield sewage that surplus is 40 DEG C.
The specific preparation process of the fireflood well self-degradation diverting agent are as follows:
(1) technical grade super guanidine gum is added in 40 DEG C of oilfield sewages, dissolution 10-15min, mixing speed is sufficiently stirred
For 100r/min；
(2) formaldehyde, alkyd resin, vinal, -2 methyl of 2- acrylamido are sequentially added into above-mentioned solution
Propane sulfonic acid, polyoxyethanyl alkyl phenyl ether, low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are 1:1 in mass ratio
Mix resulting mixed liquor, enzyme doctor Dr.Nzyme200；
(3) continue to add borax after stirring 5min and continue to stir, fireflood well self-degradation diverting agent can be obtained.
The fireflood well self-degradation diverting agent of above-mentioned preparation is subjected to the simulated experiment of rock core single tube, investigate rock core with fireflood well from
The permeability variation of diverting agent before and after the processing of degrading is shown in Table 1 with intensity, experimental data is broken through.Mensuration program is as follows:
1. rock core saturated water；
2. injecting a certain amount of fireflood well self-degradation diverting agent with certain flow, testing process is that can add external pressure, have perseverance
The old process of tepidarium；
3. the rock core of injection fireflood well self-degradation diverting agent is placed in closed container, in the water bath with thermostatic control of set temperature
Place a period of time；
4. under conditions of temperature is set temperature, identical external pressure, with certain flow water injection, until core holding unit goes out
Mouth end flows down the first drop of liquid and constantly has liquid outflow later, and the reading of input end pressure gauge is that fireflood well self-degradation is temporary at this time
The breakthrough pressure of blocking agent.
Table 1
The experimental results showed that the fireflood well self-degradation diverting agent provided by the embodiment of the present invention 1 has very strong stratum
Shut-off capacity, for effective sealing ratiod up to 90% or more, breakthrough pressure gradient reaches 15MPa/m or more, and plugging effect is ideal.
Embodiment 2
A kind of fireflood well self-degradation diverting agent is present embodiments provided, with the total weight of the fireflood well self-degradation diverting agent
For 100% meter, the raw material for preparing the fireflood well self-degradation diverting agent includes:
Hydroxypropyl guar gum 0.8%；
Borax 0.05%；
Acrylic resin (partial size 2mm) 2%；
Modified polyester fiber (fibre length 15mm, fibre tensile strength 800MPa, fibre diameter are 100 μm)
0.6%；
Sodium thiosulfate 0.1%；
Methenamine 0.5%；
Polyoxyethanyl alkyl ether 0.6%；
Low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are that 1:1 mixes resulting mixed liquor in mass ratio
3%；
Enzyme doctor Dr.Nzyme200 (galactomannans enzyme) 0.004%；
And surplus is 40 DEG C of oilfield sewages.
The specific preparation process of the fireflood well self-degradation diverting agent are as follows:
(1) hydroxypropyl guar gum is added in 40 DEG C of oilfield sewages, dissolution 10-15min, mixing speed is sufficiently stirred
100r/min；
(2) methenamine is sequentially added into above-mentioned solution, acrylic resin, modified polyester fiber, sodium thiosulfate, is gathered
Oxygen ethyl alkyl ether, low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are that 1:1 mixing is resulting mixed in mass ratio
Close liquid, enzyme doctor Dr.Nzyme200；
(3) continue to add borax after stirring 5min and continue to stir, fireflood well self-degradation diverting agent can be obtained.
The fireflood well self-degradation diverting agent of the above-mentioned preparation of the present embodiment is subjected to long-time stability experiment, experimental data is shown in Table
Shown in 2.
Table 2
| Stablize the time | 1d | 2d | 3d | 4d | 5d | 6d |
| Broken glue situation | Glue is not broken | Glue is not broken | Glue is not broken | Break glue in part | Substantially broken glue | Completely broken glue |
From Table 2, it can be seen that the fireflood well self-degradation diverting agent that embodiment 2 is prepared is under the conditions of 90 DEG C, it can
It maintains the 3d time not break glue, illustrates that the fireflood well self-degradation diverting agent has good heat resistance, be fully able to meet scene
Job requirements.
Embodiment 3
A kind of fireflood well self-degradation diverting agent is present embodiments provided, with the total weight of the fireflood well self-degradation diverting agent
For 100% meter, the raw material for preparing the fireflood well self-degradation diverting agent includes:
Hydroxypropyl guar gum 0.6%；
Organic boron 0.03%；
The organic boron used in the present embodiment is to utilize borate (Na2B4O7) and organic ligand (LGD (OH)6)
The lower stable organic complex formed of chemical assistant effect；
Synthctic fat acid resin (partial size 1mm) 1%；
Polyurethane fiber (fibre length 10mm, fibre tensile strength 500MPa, fibre diameter are 50 μm) 0.3%；
Sodium thiosulfate 0.05%；
Methenamine 0.25%；
Polyoxyethanyl fatty acid ether-ether 0.3%；
Low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are that 1:1 mixes resulting mixed liquor according to mass ratio
2%；
Enzyme doctor Dr.Nzyme200 (galactomannans enzyme) 0.002%；
And surplus is 40 DEG C of oilfield sewages.
The specific preparation process of the fireflood well self-degradation diverting agent are as follows:
(1) hydroxypropyl guar gum is added in 40 DEG C of oilfield sewages, dissolution 10-15min, mixing speed is sufficiently stirred
100r/min；
(2) sequentially added into above-mentioned solution methenamine, synthctic fat acid resin, polyurethane fiber, sodium thiosulfate,
Polyoxyethanyl fatty acid ether-ether, low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are 1:1 mixing according to mass ratio
Resulting mixed liquor, enzyme doctor Dr.Nzyme200；
(3) continue to add organic boron after stirring 5min and continue to stir, the fireflood well self-degradation diverting agent can be obtained.
The above-mentioned fireflood well self-degradation diverting agent being prepared in the present embodiment is carried out rock core temporarily to block up and damage evaluation reality
Test: rock core is saturated after water flooding through the displacement of kerosene forward direction, surveys original permeability K0；Diverting agent reverse displacement 2 hours, positive coal
Oily testing rock core permeability K1；
Core permeability K is surveyed in positive kerosene displacement 72 hoursod；
Calculate temporarily stifled rate Rzd=(K0-K1)/K0；
Calculate de-plugging rate Rd=Kod/K0；
Calculate permeability injury rate Rs=100-Rd, rock core is temporarily stifled to be shown in Table 3 with damage evaluation experimental data.
Table 3
| Core numbers | K0(md) | K1(md) | Kod(md) | Rzd(%) | Rd(%) | Rs(%) |
| 2018-a | 6.3 | 0.25 | 5.8 | 92.9 | 92.1 | 7.9 |
| 2018-b | 7.5 | 0.48 | 6.7 | 90.8 | 89.3 | 10.7 |
| 2018-c | 5.7 | 0.21 | 5.1 | 92.5 | 89.5 | 10.5 |
From table 3 it is observed that the fireflood well self-degradation diverting agent that embodiment 3 is prepared is in 60 DEG C of constant temperatures
Under, temporarily for stifled rate after 90% or more, 72 hour, which is lower than 11% to core permeability injury rate.
Embodiment 4
Viscosity and highest heat resistance after the fireflood well self-degradation diverting agent plastic that testing example 3 is prepared, experiment
Data are shown in Table 4.
Table 4
| Sample number into spectrum | Temperature (DEG C) | Viscosity (mPas) after plastic | Thermal stability (h) |
| 1# | 100 | 14520 | 78 |
| 2# | 110 | 13360 | 71 |
| 3# | 120 | 12530 | 67 |
| 4# | 130 | 11480 | 63 |
| 5# | 140 | 10600 | 52 |
| 6# | 150 | 8870 | 44 |
| 7# | 160 | 5600 | 32 |
As can be seen from Table 4, the fireflood well self-degradation diverting agent provided by embodiment 3 150 DEG C or less with compared with
Strong gelling strength can play plugging action to borehole or near wellbore zone.
Embodiment 5
Oil-soluble particle (oil-soluble resin particle) used in the fireflood well self-degradation diverting agent is prepared in testing example 3
Solubility property, experimental data is shown in Table 5.
Table 5
| Solution temperature (DEG C) | Title | Dissolving medium | Quality (g) before dissolving | Quality (g) after dissolution | Dissolution rate (%) |
| 60 | Oil-soluble particle | Tap water | 3 | 2.4 | 20 |
| 60 | Oil-soluble particle | Oilfield sewage | 3 | 1.3 | 57 |
| 60 | Oil-soluble particle | Crude oil | 3 | 0.9 | 70 |
As can be seen from Table 5, (the oil of oil-soluble particle used in the fireflood well self-degradation diverting agent is prepared in embodiment 3
Soluble resin particle) dissolution rate reaches 70% for 24 hours in 60 DEG C of crude oil, and this illustrates to prepare in embodiment 3 used in the diverting agent
The oil-soluble particle can be produced with crude oil, oil reservoir will not be polluted, the oil-soluble particle into water layer can
Play the purpose of Plugging Water Zones.
Embodiment 6
2018, the fireflood well self-degradation being prepared in Liaohe Oil Field dawn oil recovery factory field application embodiment 3
Diverting agent has carried out 4 mouthfuls of well field tests, and test effect is ideal, and experimental data obtained is shown in Table 6
Table 6
As can be seen from Table 6, four mouthfuls of one line wells of fireflood oil jacket pressure before inspection pumps is up to 4MPa, and temporarily stifled construction terminates
Afterwards, pressure drops to 0MPa, and output gas is not detected during inspection pump, and work progress is very well, and inspection pump terminates after opening pumping,
Average drainage period is 2d, and oil well normally produces.
Claims (21)
1. a kind of fireflood well self-degradation diverting agent, which is characterized in that the total weight with the fireflood well self-degradation diverting agent is
100% meter, the raw material for preparing the fireflood well self-degradation diverting agent include:
Host agent 0.3-0.8%；
Crosslinking agent 0.01-0.05%；
Oil-soluble resin 0.5-2%；
Fiber grain 0.2-0.6%；
Heat stabilizer 0.02-0.1%；
Fungicide 0.1-0.5%；
Cleanup additive 0.2-0.6%；
Fluid loss additive 1-3%；
Slow-release 0.001-0.004%；
And the water of surplus.
2. fireflood well self-degradation diverting agent according to claim 1, which is characterized in that the fireflood well self-degradation diverting agent
It is to be prepared using the preparation method included the following steps:
(1) host agent is added to the water, dissolution is sufficiently stirred, obtains solution A；
(2) fungicide, oil-soluble resin, fiber grain, heat stabilizer, cleanup additive, fluid loss additive, sustained release are added into solution A
Gel breaker obtains solution B；
(3) after agitating solution B keeps combined hybrid therein uniform, crosslinking agent is added and continues stirring to prevent partial cross-linking, obtains
The fireflood well self-degradation diverting agent.
3. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the host agent includes technical grade
The combination of one or both of super guanidine gum or hydroxypropyl guar gum.
4. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the crosslinking agent includes borax
Or the combination of one or both of organoboron compound.
5. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the grain of the oil-soluble resin
Diameter is 0.1-2mm.
6. fireflood well self-degradation diverting agent according to claim 5, which is characterized in that the oil-soluble resin includes alkyd
The combination of one or more of resin, acrylic resin and synthctic fat acid resin.
7. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the fiber of the fiber grain
Length is 3-15mm, and fibre tensile strength 20-800MPa, fibre diameter is 10-100 μm.
8. fireflood well self-degradation diverting agent according to claim 7, which is characterized in that the fiber grain includes polyethylene
The combination of one or more of alcohol fiber, modified polyester fiber, polyurethane fiber.
9. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the heat stabilizer includes 2-
The combination of one or both of -2 methyl propane sulfonic acid of acrylamido, sodium thiosulfate.
10. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the fungicide includes formaldehyde
Or the combination of one or both of methenamine.
11. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the cleanup additive includes polyoxy
One of ethyl alkyl phenyl ether, polyoxyethanyl alkyl ether, polyoxyethanyl fatty acid ether-ether, dodecyl trimethyl ammonium chloride
Or several combination.
12. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the fluid loss additive is low viscous
Spend resulting mixture after sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt are mixed according to the mass ratio of 1:2-2:1.
13. fireflood well self-degradation diverting agent according to claim 1 or 2, which is characterized in that the slow-release is made a living
Object enzyme.
14. fireflood well self-degradation diverting agent according to claim 13, which is characterized in that the biological enzyme is main component
For the biological enzyme of galactomannans enzyme.
15. fireflood well self-degradation diverting agent according to claim 14, which is characterized in that the biological enzyme is enzyme doctor
Dr.Nzyme200。
16. the preparation method of the described in any item fireflood well self-degradation diverting agents of claim 1-15 comprising following steps:
(1) host agent is added to the water, dissolution is sufficiently stirred, obtains solution A；
(2) fungicide, oil-soluble resin, fiber grain, heat stabilizer, cleanup additive, fluid loss additive, sustained release are added into solution A
Gel breaker obtains solution B；
(3) after agitating solution B keeps combined hybrid therein uniform, crosslinking agent is added and continues stirring to prevent partial cross-linking, obtains
The fireflood well self-degradation diverting agent.
17. preparation method according to claim 16, which is characterized in that the preparation method further includes matching the fungicide
The aqueous solution that mass concentration is 37-40% is made, then the operation in solution A is added in the aqueous solution.
18. preparation method according to claim 16 or 17, which is characterized in that the temperature of the water is not higher than 50 DEG C.
19. preparation method according to claim 18, which is characterized in that the water includes that clear water, tap water or oil field are dirty
Water.
20. preparation method according to claim 16 or 17, which is characterized in that the stirring is with 50-200r/min's
Speed stirs 10-15min.
21. the described in any item fireflood well self-degradation diverting agents of claim 1-15 are examined in pump or inspection tubing string operation in fireflood well
Using.
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| CN201811113327.4A CN109294541B (en) | 2018-09-25 | 2018-09-25 | Fire flooding well self-degradation temporary plugging agent and preparation method and application thereof |
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| CN111690391A (en) * | 2020-07-03 | 2020-09-22 | 北京金圣奥能源技术有限公司 | High-temperature-resistant tough degradable temporary plugging agent and preparation method thereof |
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| CN113583643A (en) * | 2021-07-24 | 2021-11-02 | 固安国勘石油技术有限公司 | Novel environment-friendly fracturing temporary plugging agent and application facility thereof |
| CN115678521A (en) * | 2022-11-03 | 2023-02-03 | 西南石油大学 | Temporary plugging agent for reservoir protection and preparation method thereof |
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| CN112029488A (en) * | 2020-08-13 | 2020-12-04 | 重庆地质矿产研究院 | Shale gas temporary plugging material and preparation method and application thereof |
| CN113583643A (en) * | 2021-07-24 | 2021-11-02 | 固安国勘石油技术有限公司 | Novel environment-friendly fracturing temporary plugging agent and application facility thereof |
| CN115678521A (en) * | 2022-11-03 | 2023-02-03 | 西南石油大学 | Temporary plugging agent for reservoir protection and preparation method thereof |
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