CN105647498B - Waterproof lock workover fluid and manufacturing method thereof - Google Patents
Waterproof lock workover fluid and manufacturing method thereof Download PDFInfo
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- CN105647498B CN105647498B CN201511032290.9A CN201511032290A CN105647498B CN 105647498 B CN105647498 B CN 105647498B CN 201511032290 A CN201511032290 A CN 201511032290A CN 105647498 B CN105647498 B CN 105647498B
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- 239000012530 fluid Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 50
- 239000000230 xanthan gum Substances 0.000 claims abstract description 30
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 30
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 30
- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003112 inhibitor Substances 0.000 claims abstract description 13
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 25
- 230000000855 fungicidal effect Effects 0.000 claims description 16
- 239000000417 fungicide Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000001103 potassium chloride Substances 0.000 claims description 14
- 235000011164 potassium chloride Nutrition 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 150000004675 formic acid derivatives Chemical class 0.000 claims description 9
- 229920005789 ACRONAL® acrylic binder Polymers 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims 1
- 235000019253 formic acid Nutrition 0.000 claims 1
- 229920001155 polypropylene Polymers 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 230000000844 anti-bacterial effect Effects 0.000 abstract 1
- 239000003899 bactericide agent Substances 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 15
- 230000006378 damage Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 238000011084 recovery Methods 0.000 description 8
- 239000000706 filtrate Substances 0.000 description 7
- 239000008186 active pharmaceutical agent Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 208000034657 Convalescence Diseases 0.000 description 3
- 239000004280 Sodium formate Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000002068 microbial inoculum Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 3
- 235000019254 sodium formate Nutrition 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000000845 anti-microbial effect Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- -1 model ZCY-03 Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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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
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention relates to the field of oil field workover, discloses a waterproof lock workover fluid and a manufacturing method thereof, and aims to solve the technical problem that the waterproof lock workover fluid in the prior art is low in temperature resistance. This waterproof lock workover fluid includes: 0.3-0.6% by weight of xanthan gum; 0.5-2.0% of high temperature resistant fluid loss agent; 0.2-0.5% by weight of a bactericide; 0.2-0.5% by weight of a water-proof locking agent; 0.5-2.0% by weight of inhibitor; the balance of water. The technical effect of improving the temperature resistance of the waterproof lock workover fluid is achieved.
Description
Technical field
The present invention relates to oil well field more particularly to a kind of Waterproof lock workover fluid and manufacturing methods.
Background technique
Currently, China is largely low permeability oil field reserves in verifying the oil in place that do not employ, proportion is up to
72.8%.According to China's third time petroleum resources investigation result, Low Permeability Oil/gas Prospective resources are respectively 53,700,000,000 tons and 24,000,000,000,000
Cubic meter, accounts for the 49% and 42.8% of national hydrocarbon potential total resources respectively.Survey data in recent years shows low-permeability oil
Field has become the key areas of China's exploration and development.
Oil field can cause the formation damage of low permeability oil field in the links of exploration and development.It is special to low permeability pay
Emphasize oil layer protection be not because this kind of oil reservoir be easier to than high-permeability pay it is contaminated, but because low permeability pay seep naturally
Saturating ability is poor, and any slight pollution damage can all lead to being greatly lowered for production capacity.For such oil field, solid phase in working fluid
Oil reservoir caused by particle blocking injury depth of invasion is limited, can be mitigated by controlling working fluid quality, but water immerses is hurt
Evil is but than more serious.According to statistics, Water-blocking damage is hypotonic, ultra-permeable reservior major determinant type, and loss ratio is generally 70%
More than, it can lead to gas well yield and be down to 1/3 or less original.Wherein, Water-blocking damage is difficult to release once occurring, and is that restriction is low
The major determinant type and bottleneck of permeability field Efficient Exploration exploitation.In workover treatment, be mainly shown as after operation recovery rate it is low,
Convalescence is long, influences workover treatment effect.
According to each oil field statistics in 2004, discovery low permeability oil field was mainly based on mid-deep strata, and buried depth is less than 1000m's
Account for about 5.2%, 1000~2000m accounts for about 43.1%, and 2000~3000m accounts for about 36.2%, accounts for about 15.5% greater than 3000m.And
Since Waterproof lock workover fluid in the prior art is mainly for the saturating oil field of shallow low permeability, so there is the not high technologies of temperature resistance to ask
Topic, therefore the workover treatment of the low permeability oil field of mid-deep strata can not be suitable for.
Summary of the invention
The present invention provides a kind of Waterproof lock workover fluid and manufacturing method, to solve the anti-of Waterproof lock workover fluid in the prior art
The not high technical problem of warm nature.
In a first aspect, the embodiment of the present invention provides a kind of Waterproof lock workover fluid, comprising:
Weight ratio is the xanthan gum of 0.3-0.6%；
Weight ratio is the fluid loss agent resistant to high temperatures of 0.5-2.0%；
Weight ratio is the fungicide of 0.2-0.5%；
Weight ratio is the Waterproof lock agent of 0.2-0.5%；
Weight ratio is the inhibitor of 0.5-2.0%；
Remaining is water.
Optionally, further includes: heavy weight additive；
Wherein, it is less than 1.16g/cm in the density of the Waterproof lock workover fluid3When, the heavy weight additive is that weight ratio is 1.5-
23.1% potassium chloride；
It is greater than 1.16g/cm in the Waterproof lock workover fluid density3When, the heavy weight additive is that weight ratio is 2.0-15.3%
Formates and 1.5-23.1% potassium chloride mixture.
Second aspect, the embodiment of the present invention provide a kind of manufacturing method of Waterproof lock workover fluid, comprising:
Water is added in beaker and the temperature of the beaker is kept to be located at 40 DEG C -50 DEG C, to obtain base soln；
The inhibitor that weight ratio is 0.5-2.0% is added while stirring in the base soln；
The xanthan gum of weight ratio 0.3-0.6% is added while stirring in the base soln；
The fluid loss agent resistant to high temperatures that weight ratio is 0.5-2.0% is added；
After the xanthan gum and the fluid loss agent resistant to high temperatures are completely dissolved, it is killing for 0.2-0.5% that weight ratio, which is added,
Microbial inoculum；
The Waterproof lock agent that weight ratio is 0.2-0.5% is added, stirring is uniform to solution, that is, obtains the Waterproof lock well workover
Liquid.
Optionally, described that water is added in beaker and the temperature of the beaker is kept to be located at 40 DEG C -50 DEG C, to obtain basis
Solution specifically includes:
Weight ratio is sequentially added in the water to be stirred for the formates of 2.0-15.3%, the potassium chloride of 1.5-23.1%
It mixes, that is, obtains the base soln.
Optionally, the mixing time being added after the formates and the potassium chloride is 30min.
Optionally, the mixing time being added after the inhibitor is 5min.
Optionally, the mixing time being added after the xanthan gum is 15-20min.
Optionally, the mixing time after the addition fluid loss agent resistant to high temperatures is 15min.
Optionally, the mixing time being added after the fungicide is 5min.
Optionally, the mixing time being added after the Waterproof lock agent is 10min.
The present invention has the beneficial effect that:
Due in embodiments of the present invention, providing a kind of Waterproof lock workover fluid, comprising: weight ratio is 0.3-0.6%'s
Xanthan gum；Weight ratio is the fluid loss agent resistant to high temperatures of 0.5-2.0%；Weight ratio is the fungicide of 0.2-0.5%；Weight ratio is
The Waterproof lock agent of 0.2-0.5%；Remaining is water.Wherein, pass through the association between xanthan gum and formates and dehydration agent resistant to high temperatures
The gnotobasis that same synergistic effect and fungicide provide, improves the heat-resisting property of Waterproof lock well workover liquid system, heat-resisting property
It can reach 150 DEG C；
Also, the filtrate reducing of the tackifying effect of xanthan gum and fluid loss agent resistant to high temperatures acts in the Waterproof lock workover fluid, can
The API filtration of system is substantially reduced, damage of the filtrate to stratum is reduced.Inhibitor can effectively prevent clay swell, aquation
Dispersion improves anti-dilative, the generation that prevention causes Water-blocking damage to aggravate due to water-sensitive.Waterproof lock agent is by increasing liquid phase and rock
The interfacial tension of Waterproof lock well workover liquid system can be effectively reduced in the contact angle on stone surface.So that Waterproof lock workover fluid has
There is a preferable oil layer protection effect, API filtration≤15ml/30min,；Anti- divalent ion can reach 100,000ppm；Anti-dilative
>=95%, interfacial tension≤0.2mN/m, recovery of core permeability >=90%, temperature resistance >=150 DEG C are restored after workover treatment
Phase≤1.3 day, recovery rate >=100% after well workover improve well workover benefit.
Also, the Waterproof lock well workover liquid and preparation method thereof economic security, preparation process is simple, and this method industrialized production can
Row is high, has preferable prospects for commercial application and higher market value.
Detailed description of the invention
Fig. 1 is the flow chart of the manufacturing method of Waterproof lock workover fluid in the embodiment of the present invention.
Specific embodiment
The present invention provides a kind of Waterproof lock workover fluid and manufacturing method, to solve the anti-of Waterproof lock workover fluid in the prior art
The not high technical problem of warm nature.
In order to solve the above technical problems, general thought is as follows for technical solution in the embodiment of the present application:
Provide a kind of Waterproof lock workover fluid, comprising: weight ratio is the xanthan gum of 0.3-0.6%；Weight ratio is 0.5-
2.0% fluid loss agent resistant to high temperatures；Weight ratio is the fungicide of 0.2-0.5%；Weight ratio is the Waterproof lock agent of 0.2-0.5%；
Weight ratio is the inhibitor of 0.5-2.0%；Remaining is water.
Wherein, pass through the synergistic function and fungicide between xanthan gum and formates and dehydration agent resistant to high temperatures
The gnotobasis of offer, improves the heat-resisting property of Waterproof lock well workover liquid system, and heat-resisting property can reach 150 DEG C；
Also, the filtrate reducing of the tackifying effect of xanthan gum and fluid loss agent resistant to high temperatures acts in the Waterproof lock workover fluid, can
Substantially reduce the API filtration of system.Inhibitor can effectively prevent clay swell, aquation dispersion, improve anti-dilative, prevention by
The generation of Water-blocking damage is caused in water-sensitive.Waterproof lock agent can effectively be dropped by the contact angle of increase liquid phase and rock surface
The interfacial tension of low Waterproof lock well workover liquid system.So that Waterproof lock workover fluid has preferable oil layer protection effect, API filtration
≤ 15ml/30min reduces damage of the filtrate to stratum；Anti- divalent ion can reach 100,000ppm；Anti-dilative >=95%, boundary
Face tension≤0.2mN/m, recovery of core permeability >=90%, temperature resistance >=150 DEG C, convalescence≤1.3 day after workover treatment,
Recovery rate >=100% after well workover improves well workover benefit.
Also, the Waterproof lock well workover liquid and preparation method thereof economic security, preparation process is simple, and this method industrialized production can
Row is high, has preferable prospects for commercial application and higher market value.
In order to better understand the above technical scheme, below by attached drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the absence of conflict, the embodiment of the present invention and embodiment
In technical characteristic can be combined with each other.
In a first aspect, the embodiment of the present invention provides a kind of Waterproof lock workover fluid, comprising:
Weight ratio is the xanthan gum of 0.3-0.6%；
Weight ratio is the fluid loss agent resistant to high temperatures of 0.5-2.0%；
Weight ratio is the fungicide of 0.2-0.5%；
Weight ratio is the Waterproof lock agent of 0.2-0.5%；
Weight ratio is the inhibitor of 0.5-2.0%；
Remaining is water.
Optionally, further includes: heavy weight additive；
Wherein, it is less than 1.16g/cm in the density of the Waterproof lock workover fluid3When, heavy weight additive is that weight ratio is 0-23.1%
Potassium chloride；
It is greater than 1.16g/cm in the Waterproof lock workover fluid density3When, heavy weight additive is the first that weight ratio is 2.0-15.3%
The mixture of the potassium chloride of hydrochlorate and 1.5-23.1%.
Fluid loss agent resistant to high temperatures is a kind of acronal, such as model ZCYB-01, have it is preferable resistant to high temperatures and
Filtrate loss controllability, and under the conditions of temperature is higher, secondary acronal can be decomposed with xanthan gum and the alkyl of generation
Free radical is combined, and is prevented the progress of xanthan gum decomposition reaction, is improved its heat-resisting property.
Fungicide is a kind of non-oxidative antimicrobial, such as model TS-809, can effectively remove bacterium, provide for system
One gnotobasis, prevents xanthan gum from being decomposed by bacterial oxidation.
Waterproof lock agent is the compound of a variety of surfactants and alcohols, such as model ZCY-03, mainly passes through waterproof
The hydrophilic lipophilic group in agent on surfactant is locked, the contact angle between rock and liquid phase is increased, reduces interfacial tension, and
Rudimentary alcohol and water dissolve each other and effumability, take the stratum occluded water of part out of, achieve the purpose that prevent Water-blocking damage.
Second aspect, based on the same inventive concept, the embodiment of the present invention provide a kind of manufacturing method of Waterproof lock workover fluid,
Referring to FIG. 1, including:
Step S101: water being added in beaker and the temperature of the beaker is kept to be located at 40 DEG C -50 DEG C, molten to obtain basis
Liquid；
Step S102: the inhibitor of weight ratio 0.5-2.0%, mixing time is added while stirring in the base soln
For example, 5min；
Step S103: the xanthan gum that weight ratio is 0.3-0.6% is added while stirring in the base soln, when stirring
Between be, for example, 15min~20min；
Step S104: being added the fluid loss agent resistant to high temperatures that weight ratio is 0.5-2.0%, and fluid loss agent resistant to high temperatures is, for example,
ZCYB-01, mixing time are, for example, 15min, until xanthan gum and fluid loss agent resistant to high temperatures are completely dissolved；
Step S105: after xanthan gum and fluid loss agent resistant to high temperatures are completely dissolved, it is killing for 0.2-0.5% that weight ratio, which is added,
Microbial inoculum, fungicide are, for example, TS-809, and mixing time is, for example, 5min；
Step S106: being added the Waterproof lock agent that weight ratio is 0.2-0.5%, and Waterproof lock agent is, for example, ZCY-03, when stirring
Between be, for example, 10min until solution is uniform obtains the Waterproof lock workover fluid.
Optionally, water is added described in step S101 in beaker and the temperature of the beaker is kept to be located at 40 DEG C -50 DEG C,
To obtain base soln, specifically include:
The potassium chloride that formates and 1.5-23.1% that weight ratio is 2.0-15.3% are sequentially added in the water carries out
Stirring, that is, obtain the base soln.The manufacturing method of the Waterproof lock workover fluid is introduced based on the specific embodiment below
And beneficial effect.
Embodiment 1
First in the beaker of a 1000ml, 320.3g clear water is measured, temperature is heated to 45 DEG C, and keeps constant temperature not
Become, 90g potassium chloride and 76.7g sodium formate is added, stirs 30min to being completely dissolved, uniform solution is presented；Then it is yellow that 3g is added
Virgin rubber stirs 15min, and 5g fluid loss agent resistant to high temperatures is added and stirs 15min, until being completely dissolved；2.5g fungicide is eventually adding to stir
5min is mixed, 2.5g Waterproof lock agent 3 is added and stirs 10min, the Waterproof lock workover fluid can be made.
Embodiment 2
First in the beaker of a 1000ml, 374.25g clear water is measured, temperature is heated to 45 DEG C, and keeps constant temperature not
Become, 105.5g potassium chloride and 10g sodium formate is added, stirs 30min to being completely dissolved, uniform solution is presented；Then it is added
2.25g xanthan gum stirs 18min, and 5g fluid loss agent resistant to high temperatures is added and stirs 15min, until being completely dissolved；1.5g is eventually adding to kill
Microbial inoculum stirs 5min, and the agent of 1.5g Waterproof lock is added, and stirs 10min, can make the Waterproof lock workover fluid.
Embodiment 3
First in the beaker of a 1000ml, 473.5g clear water is measured, temperature is heated to 45 DEG C, and keeps constant temperature not
Become, 10.0g potassium chloride and 10g sodium formate is added, homogeneous solution is presented to being completely dissolved in stirring 30min；Then it is yellow that 1.5g is added
Virgin rubber stirs 20min, and 2.5g fluid loss agent resistant to high temperatures is added and stirs 15min, until being completely dissolved；It is eventually adding 1.0g fungicide
5min is stirred, the agent of 1.5g Waterproof lock is added, 10min is stirred, the Waterproof lock workover fluid can be made.
Table 1 is low permeability oil field Waterproof lock workover fluid rheological characteristic of the present invention
The evaluation of 1 workover fluid basic performance of table
Table 2 is low permeability oil field Waterproof lock workover fluid oil layer protection effect assessment result of the present invention
2 workover fluid oil layer protection effect assessment of table
Table 3 is that low permeability oil field Waterproof lock workover fluid of the present invention heat under the conditions of 150 DEG C rolls evaluation result after 16h
3 workover fluid temperature resistance effect assessment of table
It is the results show that there is no significantly becoming for the performance of well workover liquid system under 150 DEG C of high temperature after heat rolling 16h
Change.
Typical case
Waterproof lock workover fluid prepared by embodiment 3 carries out field application.139 DEG C of bottom hole temperature (BHT) of Dagang Oilfield XX well, belong to
In the hypotonic well of high temperature, since pumping unit load is larger, unit, which is burnt, to stop production, and carries out conventional well-flushing in X month X day in 2015 to restore to take out
Oil machine equipment normally produces.Use 55m3The Waterproof lock workover fluid for the embodiment 3 that temperature is 50 DEG C well-flushing 4 hours, is constructed suitable
Benefit.3.65 ton/days of oil well output before well-flushing, when 4.49 ton/days of yield everyday, production capacity recovery rate 123% after well-flushing.
One or more embodiment of the invention, at least has the advantages that
Due in embodiments of the present invention, providing a kind of Waterproof lock workover fluid, comprising: weight ratio is 0.3-0.6%'s
Xanthan gum；Weight ratio is the fluid loss agent resistant to high temperatures of 0.5-2.0%；Weight ratio is the fungicide of 0.2-0.5%；Weight ratio is
The Waterproof lock agent of 0.2-0.5%；Remaining is water.
Wherein, pass through the synergistic function and fungicide between xanthan gum and formates and dehydration agent resistant to high temperatures
The gnotobasis of offer, improves the heat-resisting property of Waterproof lock well workover liquid system, and heat-resisting property can reach 150 DEG C；
Also, the filtrate reducing of the tackifying effect of xanthan gum and fluid loss agent resistant to high temperatures acts in the Waterproof lock workover fluid, can
Substantially reduce the API filtration of system.Inhibitor can effectively prevent clay swell, aquation dispersion, improve anti-dilative, prevention by
The generation of Water-blocking damage is caused in water-sensitive.Waterproof lock agent can effectively be dropped by the contact angle of increase liquid phase and rock surface
The interfacial tension of low Waterproof lock well workover liquid system.So that Waterproof lock workover fluid has preferable oil layer protection effect, API filtration
≤ 15ml/30min reduces damage of the filtrate to stratum；Anti- divalent ion can reach 100,000ppm；Anti-dilative >=95%, boundary
Face tension≤0.2mN/m, recovery of core permeability >=90%, temperature resistance >=150 DEG C, convalescence≤1.3 day after workover treatment,
Recovery rate >=100% after well workover improves well workover benefit.
Also, the Waterproof lock well workover liquid and preparation method thereof economic security, preparation process is simple, and this method industrialized production can
Row is high, has preferable prospects for commercial application and higher market value.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of Waterproof lock workover fluid characterized by comprising
Weight ratio is the xanthan gum of 0.3-0.6%；
Weight ratio is the fluid loss agent resistant to high temperatures of 0.5-2.0%, wherein the fluid loss agent resistant to high temperatures is acronal,
Under the high temperature conditions, the alkyl diradical that the acronal can be decomposed and be generated with the xanthan gum is combined,
Prevent the progress of xanthan gum decomposition reaction；
Weight ratio is the fungicide of 0.2-0.5%；
Weight ratio is the Waterproof lock agent of 0.2-0.5%；
Weight ratio is the inhibitor of 0.5-2.0%；
Remaining is water.
2. Waterproof lock workover fluid as described in claim 1, which is characterized in that further include: heavy weight additive；
Wherein, it is less than 1.16g/cm in the density of the Waterproof lock workover fluid3When, the heavy weight additive is that weight ratio is 1.5-
23.1% potassium chloride；
It is greater than 1.16g/cm in the Waterproof lock workover fluid density3When, the heavy weight additive is the formic acid that weight ratio is 2.0-15.3%
The mixture of the potassium chloride of salt and 1.5-23.1%.
3. a kind of manufacturing method of Waterproof lock workover fluid characterized by comprising
Water is added in beaker and the temperature of the beaker is kept to be located at 40 DEG C -50 DEG C, to obtain base soln；
The inhibitor that weight ratio is 0.5-2.0% is added while stirring in the base soln；
The xanthan gum that weight ratio is 0.3-0.6% is added while stirring in the base soln；
The fluid loss agent resistant to high temperatures that weight ratio is 0.5-2.0% is added, wherein the fluid loss agent resistant to high temperatures is propylene polymer conjunction
Object, under the high temperature conditions, the alkyl diradical that the acronal can be decomposed and be generated with the xanthan gum are tied
It closes, prevents the progress of xanthan gum decomposition reaction；
After the xanthan gum and the fluid loss agent resistant to high temperatures are completely dissolved, the fungicide that weight ratio is 0.2-0.5% is added；
The Waterproof lock agent that weight ratio is 0.2-0.5% is added, stirring is uniform to solution, that is, obtains the Waterproof lock workover fluid.
4. method as claimed in claim 3, which is characterized in that the temperature for water being added in beaker and keep the beaker
Positioned at 40 DEG C -50 DEG C, to obtain base soln, specifically include:
Weight ratio is sequentially added in the water to be stirred for the formates of 2.0-15.3%, the potassium chloride of 1.5-23.1%,
Obtain the base soln.
5. method as claimed in claim 3, which is characterized in that when the stirring after the formates and the potassium chloride is added
Between be 30min.
6. method as claimed in claim 3, which is characterized in that the mixing time being added after the inhibitor is 5min.
7. method as claimed in claim 3, which is characterized in that the mixing time being added after the xanthan gum is 15-
20min。
8. method as claimed in claim 3, which is characterized in that the mixing time being added after the fluid loss agent resistant to high temperatures is
15min。
9. method as claimed in claim 3, which is characterized in that the mixing time being added after the fungicide is 5min.
10. method as claimed in claim 3, which is characterized in that the mixing time being added after the Waterproof lock agent is
10min。
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| CN107513381B (en) * | 2016-08-31 | 2020-07-10 | 中国石油天然气股份有限公司 | Solid-free workover fluid and preparation method and use method thereof |
| CN107987812A (en) * | 2017-11-16 | 2018-05-04 | 严希海 | A kind of workover fluid and preparation method thereof |
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| CN101974315A (en) * | 2010-10-14 | 2011-02-16 | 中国海洋石油总公司 | Perforating fluid for well completion |
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