CN107286918A - A kind of efficient flushing fluid for low-permeability sandstone oil reservoir well-flushing - Google Patents
A kind of efficient flushing fluid for low-permeability sandstone oil reservoir well-flushing Download PDFInfo
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- CN107286918A CN107286918A CN201710566328.3A CN201710566328A CN107286918A CN 107286918 A CN107286918 A CN 107286918A CN 201710566328 A CN201710566328 A CN 201710566328A CN 107286918 A CN107286918 A CN 107286918A
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention provides a kind of efficient flushing fluid suitable for low-permeability sandstone oil reservoir, the efficient flushing fluid includes Waterproof lock agent 0.1%~1.0%, expansion-resisting agent 0.5%~3.0%, and cosolvent 5.0%~10.0%, surplus is water.The efficient well-flushing liquid energy of the present invention by low-permeability sandstone reservoir wettability by strong water it is wet to change into weak water wet, eliminate reservoir self-priming capillary force；With ultralow oil water interfacial tension and very strong anti-emulsion ability, water lock, Jia Min injuries can be effectively reduced；With excellent anti-clayswelling performance, water fire extinguishing can be effectively reduced, farthest reservoir protec-tion.
Description
Technical field
The present invention relates to a kind of flushing fluid, and in particular to a kind of well-flushing for the reservoir protection for being applicable to low-permeability sandstone oil reservoir
Liquid.
Background technology
Clean-out service is one of conventional maintenance measure of oil well, but LOW PERMEABILITY RESERVOIR generally has strata pressure level low, oil
The features such as layer sensitiveness is strong, when carrying out clean-out service using conventional flushing fluid, flushing fluid easily enters reservoir, and water is caused to reservoir
Lock, emulsification, water-sensitive etc. are injured, and substantial amounts of laboratory experiment shows, flushing fluid invaded formation, and the injury of generation is mainly water lock,
Also there are hydration swelling and oil-water emulsion etc. simultaneously.These reservoir damages are once formed, it is difficult to released, and then are caused after oil well cleanup
Yield is difficult to recover or to recover the cycle long, and oil well is also resulted in when serious and is lain well.
The well-flushing liquid system using Waterproof lock agent, anti-clayswelling agent as main treating agent is mainly by adding surface-active at present
Agent invades degree, releasing water blocking damage, suppression hydration and expansion of clay etc. to reduce working fluid.But also there is following two aspect to ask
Topic：1. well-flushing liquid system generally existing reduces inadequate interfacial tension, anti-newborn ability, suppresses hydration swelling effect difference etc., it is difficult to
Meet the demand of LOW PERMEABILITY RESERVOIR reservoir protection；2. well-flushing liquid system is more to release injury of the drilling fluid to gas-bearing formation, on oil well
The well-flushing liquid system of well-flushing and routine work etc. is less, while the research to rock wettability is relatively fewer.
CN103351856A discloses a kind of flushing fluid for releasing low-permeability sandstone reservoir drilling fluid damage and preparation method thereof,
The flushing fluid includes：Surfactant weight is than 0.05-0.1%, and organic solvents, chloroform weight is than 8-10%, potassium formate weight ratio
5.0-6.0%, dioxygen water weight ratio 0.6-0.8%, hydrofluoric acid weight than 0.5%-0.8%, its can make low permeability sand reservoirs by
Strong hydrophilicity is changed into slightly water-wet, eliminates reservoir capillary force, and dissolving enters partial solid phase, breaks blocking, improves gas water-displacement rate, reduction
Solid phase is injured, so that recovery of core permeability is improved significantly.Although above-mentioned flushing fluid can change rock to a certain extent
Stone wetability, but with high molecular polymer, the dissolving filtrate solid phase particles of drilling fluid in intrusion gas-bearing formation of degrading, reduction filtrate is to gas
Based on the injury of layer.
CN103602326A discloses a kind of new and effective flushing fluid and preparation method for possessing oil layer protection effect with answering
With described flushing fluid is with methyl chloride dihydroxy ethyl carboxyethyl ammonium, methanol, phenol-amine resin polyoxyethylene polypropylene ether, hydroxyl
Amido polyetheramine compounding is formed.The flushing fluid can efficiently well-flushing while protect stratum, do not influence oil well normally to produce, have
Yield is improved, cost is reduced, significantly improves economic benefit and other effects.But above-mentioned flushing fluid is not ground to rock wettability
Study carefully, and interfacial tension can only be reduced to 10-2MN/m, anti-emulsion ability is also limited, and anti-newborn rate can only achieve more than 75%.
CN104449627A discloses a kind of oil layer protection accelerator and preparation method thereof, and the oil layer protection accelerator includes
Following components in percentage by weight：Polyepichlorohydrin-dimethylamine 0.1%~1.0%, ammonium chloride 0.5%~2.0%, surface
Activating agent 0.1%~0.5%, ethanol 5%~15%, surplus is water.Although the oil layer protection accelerator can reach anti-dilative
More than 92%, surfactant also can be greatly lowered oil water interfacial tension and hollow billet resistance, but can not make rock wettability
Slightly water-wet is changed into from strong hydrophilicity, it is impossible to eliminate reservoir self-priming capillary force.
The content of the invention
In view of the above problems, the invention provides a kind of efficient flushing fluid for low-permeability sandstone oil reservoir, the well-flushing liquid energy
The wetability of low-permeability sandstone oil reservoir is changed into slightly water-wet from strong hydrophilicity, eliminate reservoir self-priming capillary force, and can effectively reduce profit
Interfacial tension, the hydration swelling for preventing oil-water emulsion and control clay mineral, can farthest drop while efficient well-flushing
Injury of the low flushing fluid to low-permeability sandstone oil reservoir.
A kind of efficient flushing fluid for low-permeability sandstone oil reservoir that the present invention is provided, is matched according to the following percentages by weight：
Waterproof lock agent 0.1%~1.0%；
Expansion-resisting agent 0.5%~3.0%；
Cosolvent 5.0%~10.0%；
Surplus is water.
It is further preferred that matching according to the following percentages by weight：
Waterproof lock agent 0.2%~0.56%；
Expansion-resisting agent 1.5%~2.8%；
Cosolvent 6.0%~8.5%；
Surplus is water.
It is further preferred that Waterproof lock agent be by anionic surfactant, cationic surface active agent and it is non-from
Subtype surfactant compound is constituted, in terms of mol ratio, anionic surfactant:Cationic surface active agent:It is non-
Ionic surfactant is (0.4-0.6)：(1-1.5)：(1.2-1.5).
It is further preferred that anionic surfactant is enuatrol, sodium laurate, lauryl sodium sulfate, 12
One or more of mixtures in sodium alkyl benzene sulfonate, cationic surface active agent be DTAB,
One or more in cetyl trimethylammonium bromide, OTAC, bromide sixteen alkyls pyridine, it is non-from
Subtype surfactant is one or more of mixtures in APES, AEO.
It is further preferred that described expansion-resisting agent is polyether diamine class.
It is further preferred that described cosolvent is one or more of mixtures in methanol, ethanol, propyl alcohol.
Present invention also offers the preparation method of the above-mentioned efficient flushing fluid for low-permeability sandstone oil reservoir, by said ratio handle
Waterproof lock agent, cosolvent are directly added into water, are heated to 45~55 DEG C, are sufficiently stirred for 1-2 hours, treat that each inorganic agent is completely dissolved
After add expansion-resisting agent make its be well mixed, that is, obtain the flushing fluid.
Beneficial effects of the present invention：For low-permeability sandstone oil reservoir, generally with strata pressure is low, reservoir sensitivity is strong, hair
Capillary pressure is high, the features such as hole shouts tiny, in washing well process, and when carrying out well-flushing using conventional flushing fluid, flushing fluid easily leaks
Lose to stratum, and enter behind stratum, flushing fluid reduces oil water interfacial tension, prevents emulsification of crude oil and suppresses hydration and expansion of clay
Ability is again inadequate, and then causes reservoir to come to harm.In order to ensure being smoothed out for clean-out service, leakage washing to stratum is reduced
How more effectively to reduce or release formation damage after well liquid amount and lost circulation stratum, introduce a kind of efficient flushing fluid and
Its preparation method.The flushing fluid has the following advantages that：
(1) reservoir rock surface wettability is changed：The Waterproof lock agent of addition, can make the rock surface of low-permeability sandstone oil reservoir by
Strong hydrophilicity is changed into slightly water-wet, eliminates capillary force, reduces the intrusion degree of flushing fluid.
(2) oil water interfacial tension and stronger anti-emulsion ability are effectively reduced：The Waterproof lock agent of special ratios compounding is added,
Oil water interfacial tension can be made to reach 10-4MN/m, anti-newborn rate >=98% can farthest reduce water lock, Jia Min injuries.
(3) hydration swelling of clay mineral is suppressed：The polyether diamine class expansion-resisting agent of addition, anti-dilative up to more than 94%,
Expansion, the peptizaiton of clay can effectively be suppressed.
Compared with conventional flushing fluid, flushing fluid of the invention has excellent Waterproof lock, prevents swollen, anti-emulsion performance, and matches somebody with somebody
Liquid is simple, can be while efficient well-flushing, farthest injury of the reduction flushing fluid to low-permeability sandstone oil reservoir, with good
Application prospect.
Embodiment
Hereafter further explaination and evidence will be done to the technical concept of the present invention by specific embodiment.
As being the general former material of industry in the market without all raw material used in generation, following embodiments are referred in particular to
Material.
Embodiment 1
Efficient flushing fluid suitable for Jiangsu low-permeability sandstone oil reservoir is mixed with by following components：
0.2 part of Waterproof lock agent, 0.06 part of its cationic surfactant cetyl trimethylammonium bromide, anion
0.08 part of type Surfactant SDS, 0.06 part of nonionic surface active agent AEO；
2.0 parts of expansion-resisting agent polyether diamine class；
6.0 parts of cosolvent methanol；
Surplus is water.
Waterproof lock agent, cosolvent are directly added into water by proportioning, 45~55 DEG C is heated to, is sufficiently stirred for 1-2 hours, treats
Each inorganic agent adds expansion-resisting agent after being completely dissolved be well mixed it, you can obtains efficiently washing suitable for low-permeability sandstone oil reservoir
Well liquid.
The experiments such as the solution water blocking damage evaluation of the indoor efficient flushing fluid of development, draw through Lab-evaluation, in the present embodiment
Efficient flushing fluid oil water interfacial tension reaches 3.55 × 10-4The mN/m orders of magnitude, recovery of core permeability 97%, anti-dilative
95%, anti-newborn rate 100%.
Rock sample wetability is determined using self-soaking method, declined by the wet index of rock sample water of flushing fluid before and after the processing by 0.941
To 0.615, illustrate that low-permeability sandstone oil reservoir from strong hydrophilicity can be changed into slightly water-wet by the flushing fluid, eliminate reservoir self-priming capillary force, drop
The intrusion degree of low flushing fluid.
Embodiment 2
Efficient flushing fluid suitable for Jiangsu low-permeability sandstone oil reservoir is mixed with by following components：
0.25 part of Waterproof lock agent, 0.065 part of its cationic surfactant DTAB, it is cloudy from
0.087 part of subtype surfactant sodium dodecyl base benzene sulfonic acid sodium salt, nonionic surface active agent APES 0.098
Part；
2.5 parts of expansion-resisting agent polyether diamine class；
8.0 parts of cosolvent propyl alcohol；
Surplus is water.
Waterproof lock agent, cosolvent are directly added into water by proportioning, 45~55 DEG C is heated to, is sufficiently stirred for 1-2 hours, treats
Each inorganic agent adds expansion-resisting agent after being completely dissolved be well mixed it, you can obtains efficiently washing suitable for low-permeability sandstone oil reservoir
Well liquid.
The experiments such as the solution water blocking damage evaluation of the indoor efficient flushing fluid of development, draw through Lab-evaluation, in the present embodiment
Efficient flushing fluid oil water interfacial tension 4.22 × 10-4The mN/m orders of magnitude, recovery of core permeability 99%, anti-dilative 94% is prevented
Newborn rate 99%.
Rock sample wetability is determined using self-soaking method, declined by the wet index of rock sample water of flushing fluid before and after the processing by 0.962
To 0.727, illustrate that low-permeability sandstone oil reservoir from strong hydrophilicity can be changed into slightly water-wet by the flushing fluid, eliminate reservoir self-priming capillary force, drop
The intrusion degree of low flushing fluid.
Comparative example 1
The flushing fluid for releasing long celebrating ancient times low-permeability sandstone reservoir drilling fluid damage is prepared by following components, according to weight percent
Than use：
Clear water weight ratio 82.6%, surfactant weight compares 0.1%, and the chloroform weight as organic solvent compares 10%,
Potassium formate weight compares 6.0%, and dioxygen water weight ratio 0.8%, hydrofluoric acid weight compares 0.5%, is mixed and made into releasing long celebrating ancient times low
Ooze the flushing fluid of sandstone reservoir drilling fluid damage.
Laboratory condition according to embodiment 1 carries out experiment and drawn, the well-flushing light-liquid interfacial tension is 7.6 × 10-3mN/m；It is anti-
Swollen rate is 81%；Anti- newborn rate is 90%；Recovery of core permeability is 72%.
Comparative example 2
Reaction condition：
Reaction temperature：40 DEG C~45 DEG C
Reaction pressure：- 0.08~0.15Mpa
Reaction time：1~2h.
Production 1000 parts of products feed intake：
Preparation process：
1) press rate of charge, in the case where 0.1Mpa is stirred at room temperature, successively added into water methyl chloride dihydroxy ethyl carboxyethyl ammonium,
Phenol-amine resin polyoxyethylene polypropylene ether, azanol base polyetheramine.
2) slowly 40 DEG C~45 DEG C are warming up to and 0.5h is stirred continuously.
3) methanol is added by proportioning, continuation stirring 1h is new to the well mixed formation protection that can obtain the present embodiment
Efficient flushing fluid.
Laboratory condition according to embodiment 1 carries out experiment and drawn, the new and effective flushing fluid interface of the formation protection
Power is 9.8 × 10-3mN/m；Anti-dilative is 86%；Anti- newborn rate is 87%；Recovery of core permeability is 95%.
Comparative example 3 (embodiment in CN 104449627A)
The oil layer protection accelerator of the present embodiment, includes following components in percentage by weight：
Polyepichlorohydrin-dimethylamine 1.0%, ammonium chloride 2.0%, fluorocarbon surfactant 0.5%, ethanol 15%, it is remaining
Measure as water.The preparation method of the oil layer protection accelerator of this comparative example, comprises the following steps：1) the poly- epoxy chloropropionate of formula ratio is taken
Alkane-dimethylamine, surfactant and ethanol, add and account in the water that oil layer protection accelerator mass percent is 60%, mixing is equal
After even, mixture is obtained；2) step 1 is taken) gained mixture, the ammonium chloride and remaining water of formula ratio are added, is well mixed, i.e.,
.
Laboratory condition according to embodiment 1 carries out experiment and show that the efficient flushing fluid oil water interfacial tension is
The 16.85mN/m orders of magnitude, recovery of core permeability 96%, anti-dilative 92%, anti-newborn rate 90%.
The efficient well-flushing liquid energy that the present invention is provided makes the wetability of low-permeability sandstone oil reservoir be changed into slightly water-wet from strong hydrophilicity, eliminates
Reservoir self-priming capillary force, and oil water interfacial tension can be reduced to 10-4MN/m, anti-dilative >=94%, anti-newborn rate >=98%, rock core
Permeability resume figure >=97%, heatproof >=120 DEG C.
Claims (7)
1. a kind of efficient flushing fluid for low-permeability sandstone oil reservoir, it is characterised in that match according to the following percentages by weight：
Waterproof lock agent 0.1%~1.0%；
Expansion-resisting agent 0.5%~3.0%；
Cosolvent 5.0%~10.0%；
Surplus is water.
2. efficient flushing fluid according to claim 1, it is characterised in that match according to the following percentages by weight：
Waterproof lock agent 0.2%~0.56%；
Expansion-resisting agent 1.5%~2.8%；
Cosolvent 6.0%~8.5%；
Surplus is water.
3. efficient flushing fluid according to claim 1, it is characterised in that Waterproof lock agent is by anionic surface activity
Agent, cationic surface active agent and nonionic surface active agent compounding composition, wherein, in terms of mol ratio, anionic
Surfactant：Cationic surface active agent：Nonionic surface active agent is (0.4-0.6)：(1-1.5)：(1.2-
1.5)。
4. efficient flushing fluid according to claim 1, it is characterised in that anionic surfactant is enuatrol, the moon
One or more of mixtures in sodium metasilicate, lauryl sodium sulfate, neopelex, cationic surfactant
Agent is DTAB, cetyl trimethylammonium bromide, OTAC, bromohexadecane
One or more in yl pyridines, nonionic surface active agent is in APES, AEO
One or more of mixtures.
5. efficient flushing fluid according to claim 1, it is characterised in that described expansion-resisting agent is polyether diamine class.
6. efficient flushing fluid according to claim 1, it is characterised in that described cosolvent is in methanol, ethanol, propyl alcohol
One or more of mixtures.
7. a kind of preparation side of efficient flushing fluid for low-permeability sandstone oil reservoir according to any one of claim 1-6
Method, it is characterised in that Waterproof lock agent, cosolvent are directly added into water by said ratio, is heated to 45~55 DEG C, is sufficiently stirred for
1-2 hours, expansion-resisting agent is added after each inorganic agent is completely dissolved was well mixed it, that is, obtains the flushing fluid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710566328.3A CN107286918B (en) | 2017-07-12 | 2017-07-12 | Efficient well flushing fluid for well flushing of low-permeability sandstone oil reservoir |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566328.3A CN107286918B (en) | 2017-07-12 | 2017-07-12 | Efficient well flushing fluid for well flushing of low-permeability sandstone oil reservoir |
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| CN107286918A true CN107286918A (en) | 2017-10-24 |
| CN107286918B CN107286918B (en) | 2020-04-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110317592A (en) * | 2019-07-11 | 2019-10-11 | 河北华北石油港华勘察规划设计有限公司 | A kind of flushing fluid and preparation method thereof |
| CN111534290A (en) * | 2020-05-06 | 2020-08-14 | 中国石油天然气集团有限公司 | Water-lock releasing agent for reservoir protection drilling fluid and preparation and use methods thereof |
| CN112430458A (en) * | 2020-12-03 | 2021-03-02 | 成都欣明化工有限公司 | Water-releasing and locking agent for gas well reservoir |
| CN113088265A (en) * | 2019-12-23 | 2021-07-09 | 中石化南京化工研究院有限公司 | High-temperature-resistant efficient clay stabilizer |
| CN114316924A (en) * | 2020-10-10 | 2022-04-12 | 中石化南京化工研究院有限公司 | Waterproof locking agent based on anion-cation pair effect and application thereof |
| CN116200180A (en) * | 2021-11-30 | 2023-06-02 | 中国石油天然气股份有限公司 | Low-permeability oil-gas reservoir waterproof locking agent and preparation method thereof |
-
2017
- 2017-07-12 CN CN201710566328.3A patent/CN107286918B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110317592A (en) * | 2019-07-11 | 2019-10-11 | 河北华北石油港华勘察规划设计有限公司 | A kind of flushing fluid and preparation method thereof |
| CN113088265A (en) * | 2019-12-23 | 2021-07-09 | 中石化南京化工研究院有限公司 | High-temperature-resistant efficient clay stabilizer |
| CN113088265B (en) * | 2019-12-23 | 2023-04-25 | 中石化南京化工研究院有限公司 | High-temperature-resistant efficient clay stabilizer |
| CN111534290A (en) * | 2020-05-06 | 2020-08-14 | 中国石油天然气集团有限公司 | Water-lock releasing agent for reservoir protection drilling fluid and preparation and use methods thereof |
| CN111534290B (en) * | 2020-05-06 | 2022-10-18 | 中国石油天然气集团有限公司 | Water-lock releasing agent for reservoir protection drilling fluid and preparation and use methods thereof |
| CN114316924A (en) * | 2020-10-10 | 2022-04-12 | 中石化南京化工研究院有限公司 | Waterproof locking agent based on anion-cation pair effect and application thereof |
| CN112430458A (en) * | 2020-12-03 | 2021-03-02 | 成都欣明化工有限公司 | Water-releasing and locking agent for gas well reservoir |
| CN116200180A (en) * | 2021-11-30 | 2023-06-02 | 中国石油天然气股份有限公司 | Low-permeability oil-gas reservoir waterproof locking agent and preparation method thereof |
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