CN109054776A - A kind of seawater base Solid Free clear brine workover fluid and its preparation method and application - Google Patents
A kind of seawater base Solid Free clear brine workover fluid and its preparation method and application Download PDFInfo
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- CN109054776A CN109054776A CN201811121024.7A CN201811121024A CN109054776A CN 109054776 A CN109054776 A CN 109054776A CN 201811121024 A CN201811121024 A CN 201811121024A CN 109054776 A CN109054776 A CN 109054776A
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- workover fluid
- solid free
- base solid
- clear brine
- free clear
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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
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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 discloses a kind of seawater base Solid Free clear brine workover fluids and its preparation method and application, wherein the workover fluid is made of inorganic salts clay stabilizer, anticorrosion and bactericidal agent, defoaming agent and sea water solution；Wherein inorganic salts clay stabilizer mass percent is 1.5%~2.5%, and anticorrosion and bactericidal agent mass percent is 0.5%~1.5%, and defoaming agent mass percent is 0.1%~0.3%, remaining is sea water solution.The preparation method of workover fluid: after cleaning mud pit to no residual oil, solid formation, by sea water filter to entering well NTU less than 30, inorganic salts clay stabilizer, anticorrosion and bactericidal agent are sequentially added according to formula rate, it is mixed evenly, defoaming agent is added after standing 20min, obtains the seawater base Solid Free clear brine workover fluid.Water fire extinguishing caused by effectively inhibiting because of clay mineral hydration swelling, migration shortens well workover convalescence；Tubing string risk of breakage caused by being effectively reduced because of seawater corrosion.
Description
Technical field
The invention belongs to field of oilfield chemistry, and in particular to a kind of seawater base workover fluid.
Background technique
For offshore loose sand marine deposit reservoir because the miscellaneous base content of shale is higher, it is easy that well workover process outside fluid invades reservoir
Clay mineral hydration swelling is caused, causes oil flow channel to narrow or decomposes cementing mineral grain, is mobile, reservoir is caused to permeate
Rate decline, external manifestation are water fire extinguishing, produce liquid decline or the extension of well workover oil-producing convalescence.Especially in water breakthrough low permeability reservoir,
Clay mineral grain forms bridge blinding under the migration of water at pore throat, and intercepts subsequent particle and cause secondary injury.It is same with this
When, since geographical location limits, well workover requires seawater to prepare with liquid.Opposite fresh water, the Cl in seawater-Ion easily causes tubing table
Face Damage of Passive Film, forms spot corrosion or pitting corrosion is further exacerbated by tube corrosion risk of breakage under the action of tensile stress.
Therefore, it is necessary to develop a kind of seawater base Solid Free clear brine workover fluid.
Summary of the invention
On the one hand, a kind of in order to overcome above-mentioned deficiency, present invention aims at providing seawater base Solid Free clear brine
Workover fluid.Water fire extinguishing caused by the workover fluid effectively inhibits because of clay mineral hydration swelling, migration shortens well workover convalescence；
And tubing string risk of breakage caused by being also effectively reduced because of seawater corrosion.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of seawater base Solid Free clear brine workover fluid, by inorganic salts clay stabilizer, anticorrosion and bactericidal agent, defoaming agent and
Sea water solution composition；Wherein inorganic salts clay stabilizer mass percent is 1.5%~2.5%, anticorrosion and bactericidal agent quality percentage
Than being 0.5%~1.5%, defoaming agent mass percent is 0.1%~0.3%, remaining is sea water solution.
Further, the inorganic salts clay stabilizer is potassium chloride (KCl).
Further, the anticorrosion and bactericidal agent is the mixing of dodecyl dimethyl benzyl group ammonium chloride and dithiocyano-methane
Object, the two mixed proportion are 10: 1.
Further, the defoaming agent is the mixture of organosilicon, polyoxypropylene ethylene oxide glycerin ether, glycerol, three
Mixed proportion is 1: 2: 5.
Further, the sea water solution is filtering sea or oilfield injection water.
On the other hand, the present invention provides the preparation methods of above-mentioned seawater base Solid Free clear brine workover fluid, including such as
Lower step: after cleaning mud pit to no residual oil, solid formation, by sea water filter to entering well NTU less than 30, according to formula rate according to
Secondary addition inorganic salts clay stabilizer, anticorrosion and bactericidal agent, are mixed evenly, and defoaming agent is added after standing 20min, obtain described
Seawater base Solid Free clear brine workover fluid.
In another aspect, the present invention also provides a kind of seawater base Solid Free clear brine workover fluid as described above at sea oil fields
Application during well workover.
The function of each component and effect are as follows in seawater base Solid Free clear brine well workover liquid system provided by the invention: nothing
On the one hand machine salt clay stabilizer reduces surface of clay diffusion electric double layer thickness and Zeta electric potential, another aspect K+Diameter
Gap inscribe diameter (0.280nm) that (0.266nm) and surface of clay are surrounded by 60 atoms matches, and easily enters this space simultaneously
It is not easy to discharge from space, can effectively neutralize the elecrtonegativity of surface of clay；Anticorrosion and bactericidal agent unique texture can be effectively on tubing string
Hydrophobicity protective film is formed, slows down corrosion rate and has to stratum bacterium and kill effect；Defoaming agent is effectively eliminated with liquid process
Because of the blistering that stirring generates, reduce into well frictional resistance, and play the role of lubrication and return row.
Beneficial effects of the present invention:
Water fire extinguishing caused by effectively inhibiting because of clay mineral hydration swelling, migration shortens well workover convalescence；It is effectively reduced
Because of tubing string risk of breakage caused by seawater corrosion；
It has both and is prepared simply, convenient for construction, lower-price characteristic simultaneously.
Also have the characteristics that prevent that tube corrosion, to kill pit shaft bacterium, reservoir damage low.
Specific embodiment
The present invention is further described below with reference to embodiment.Technical characteristic described in following embodiments or technology are special
The combination of sign is not construed as isolated, they can be combined with each other to reaching superior technique effect.And this hair
It is bright to be not limited in following embodiments.
Embodiment 1:
A kind of seawater base Solid Free clear brine workover fluid, by inorganic salts clay stabilizer, anticorrosion and bactericidal agent, defoaming agent and
Sea water solution composition；Wherein inorganic salts clay stabilizer mass percent is 1.5%, and anticorrosion and bactericidal agent mass percent is
0.5%, defoaming agent mass percent is 0.1%, sea water solution 97.9%.The inorganic salts clay stabilizer is potassium chloride
(KCl)；The anticorrosion and bactericidal agent is the mixture of dodecyl dimethyl benzyl group ammonium chloride and dithiocyano-methane, the two mixing
Ratio is 10: 1；The defoaming agent is the mixture of organosilicon, polyoxypropylene ethylene oxide glycerin ether, glycerol, three's mixing ratio
Example is 1: 2: 5.
The preparation method of offshore oilfield well workover seawater base Solid Free clear brine workover fluid: cleaning mud pit to no remnants
After oil, solid formation, by sea water filter to well NTU is entered less than 30, filtering sea 97900kg is added, then successively into mud pit
Inorganic salts clay stabilizer 1500kg, anticorrosion and bactericidal agent 500kg is added, is sufficiently stirred, is uniformly mixed, is added after standing 20min
Defoaming agent 100kg to get arrive seawater base Solid Free clear brine workover fluid.
Embodiment 2:
A kind of seawater base Solid Free clear brine workover fluid, by inorganic salts clay stabilizer, anticorrosion and bactericidal agent, defoaming agent and
Sea water solution composition；Wherein inorganic salts clay stabilizer mass percent is 2.5%, and anticorrosion and bactericidal agent mass percent is
1.5%, defoaming agent mass percent is 0.3%, sea water solution 95.7%.The inorganic salts clay stabilizer is potassium chloride
(KCl)；The anticorrosion and bactericidal agent is the mixture of dodecyl dimethyl benzyl group ammonium chloride and dithiocyano-methane, the two mixing
Ratio is 10: 1；The defoaming agent is the mixture of organosilicon, polyoxypropylene ethylene oxide glycerin ether, glycerol, three's mixing ratio
Example is 1: 2:5.
The preparation method of offshore oilfield well workover seawater base Solid Free clear brine workover fluid: cleaning mud pit to no remnants
After oil, solid formation, by sea water filter to well NTU is entered less than 30, filtering sea 95700kg is added, then successively into mud pit
Inorganic salts clay stabilizer 2500kg, anticorrosion and bactericidal agent 1500kg is added, is sufficiently stirred, is uniformly mixed, is added after standing 20min
Defoaming agent 300kg to get arrive seawater base Solid Free clear brine workover fluid.
Embodiment 3:
A kind of seawater base Solid Free clear brine workover fluid, by inorganic salts clay stabilizer, anticorrosion and bactericidal agent, defoaming agent and
Sea water solution composition；Wherein inorganic salts clay stabilizer mass percent is 2%, and anticorrosion and bactericidal agent mass percent is 1%, is disappeared
Infusion mass percent is 0.2%, sea water solution 96.8%.The inorganic salts clay stabilizer is potassium chloride (KCl)；It is described
Anticorrosion and bactericidal agent is the mixture of dodecyl dimethyl benzyl group ammonium chloride and dithiocyano-methane, and the two mixed proportion is 10:
1；The defoaming agent is the mixture of organosilicon, polyoxypropylene ethylene oxide glycerin ether, glycerol, and three's mixed proportion is 1: 2: 5.
The preparation method of offshore oilfield well workover seawater base Solid Free clear brine workover fluid: cleaning mud pit to no remnants
After oil, solid formation, by sea water filter to well NTU is entered less than 30, filtering sea 96800kg is added, then successively into mud pit
Inorganic salts clay stabilizer 2000kg, anticorrosion and bactericidal agent 1000kg is added, is sufficiently stirred, is uniformly mixed, is added after standing 20min
Defoaming agent 200kg to get arrive seawater base Solid Free clear brine workover fluid.
By taking embodiment 3 as an example, evaluates the compatibility of workover fluid and water flooding: investigating repair under the conditions of room temperature and 80 DEG C respectively
The compatibility of well liquid and water flooding different ratio.Experimental result is as shown in table 1.
The compatibility evaluation result of table 1 well workover liquid system and water flooding
The results showed that well workover liquid system and equal compatibility under water flooding different conditions of mixture ratios under the conditions of room temperature and 80 DEG C
Well.
By taking embodiment 3 as an example, evaluate the corrosion inhibition of workover fluid: evaluation method uses corrosion weight loss method, with reference to Chinese stone
Oily professional standard SY/T5273-91 " oil-field flooding corrosion inhibiter assessment method ".The corrosion of each system is measured under the conditions of 80 DEG C, after 7d
Rate, the results are shown in Table 2.
The corrosion inhibition evaluation result (7d/80 DEG C of experimental period/N80 steel) of 2 well workover liquid system of table
The results showed that well workover liquid system of the invention is 0.0596mm/a to the average corrosion rate of N80 steel disc, it is full
Foot is less than the Industry code requirements of 0.076mm/a corrosion rate, i.e., well workover liquid system of the invention has preferable corrosion inhibition.
By taking embodiment 3 as an example, the clay stabilization performance of workover fluid is evaluated: according to China National Petroleum professional standard SY/
Centrifugal process in T5971-2016 " oil-gas field fracturing acidification and water filling clay stabilizer method of evaluating performance " calculates workover fluid
The anti-dilative of system, the clay stability of appraisement system.Experimental result is as shown in table 3.
The clay stabilization performance evaluation result (80 DEG C of experimental temperature) of 3 well workover liquid system of table
The results showed that well workover liquid system anti-dilative of the invention can reach 89.1%, it is higher than CNOOC company standard
Defined anti-dilative 85% shows that well workover liquid system of the invention has preferable clay stabilization performance.
By taking embodiment 3 as an example, the reservoir protection performance of workover fluid is evaluated: referring to China National Petroleum professional standard SY/
T6540-2002 " damage of drilling fluid and completion fluid reservoir indoor evaluation method " carries out reservoir protection to well workover liquid system of the invention
Performance evaluation.Experimental result is as shown in table 4.
4 well workover liquid system reservoir protection energy evaluation result of table
The results showed that permeability resume figure has reached 99% or more, table after workover fluid of the invention pollutes rock core
Damage of the bright workover fluid to reservoir is smaller, has preferable reservoir protection effect.
By taking embodiment 3 as an example, the application effect of workover fluid is evaluated: in THE WESTERN SOUTH CHINA SEA oil field block application effect such as following table
Shown in 5.
5 well workover liquid system of table is in THE WESTERN SOUTH CHINA SEA oil field block applicable cases
Field application the result shows that: use well workover liquid system of the invention, after workover treatment oil well restore the period it is shorter, be
1~2 day, and the condition of production is restored preferably, to produce liquid (oil) amount before reaching well workover, have good reservoir protection effect after well workover.
Claims (7)
1. a kind of seawater base Solid Free clear brine workover fluid, it is characterised in that: by inorganic salts clay stabilizer, antisepsis and sterilization
Agent, defoaming agent and sea water solution composition；Wherein inorganic salts clay stabilizer mass percent is 1.5%~2.5%, anticorrosion and bactericidal agent
Mass percent is 0.5%~1.5%, and defoaming agent mass percent is 0.1%~0.3%, remaining is sea water solution.
2. a kind of seawater base Solid Free clear brine workover fluid as described in claim 1, it is characterised in that: the inorganic salts are viscous
Soil stabilizer is potassium chloride (KCl).
3. a kind of seawater base Solid Free clear brine workover fluid as described in claim 1, it is characterised in that: the antisepsis and sterilization
Agent is the mixture of dodecyl dimethyl benzyl group ammonium chloride and dithiocyano-methane, and the two mixed proportion is 10:1.
4. a kind of seawater base Solid Free clear brine workover fluid as described in claim 1, it is characterised in that: the defoaming agent is
Organosilicon, polyoxypropylene ethylene oxide glycerin ether, glycerol mixture, three's mixed proportion be 1:2:5.
5. a kind of seawater base Solid Free clear brine workover fluid as described in claim 1, it is characterised in that: the sea water solution
For filtering sea or oilfield injection water.
6. a kind of preparation method of seawater base Solid Free clear brine workover fluid as described in claim 1 to 5, feature exist
In, include the following steps: after cleaning mud pit to no residual oil, solid formation, by sea water filter to entering well NTU less than 30, according to
Formula rate sequentially adds inorganic salts clay stabilizer, anticorrosion and bactericidal agent, is mixed evenly, and defoaming is added after standing 20min
Agent obtains the seawater base Solid Free clear brine workover fluid.
7. such as seawater base Solid Free clear brine workover fluid as claimed in any one of claims 1 to 6, it is characterised in that: it is applied
In the well workover of offshore oilfield.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121024.7A CN109054776A (en) | 2018-09-25 | 2018-09-25 | A kind of seawater base Solid Free clear brine workover fluid and its preparation method and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811121024.7A CN109054776A (en) | 2018-09-25 | 2018-09-25 | A kind of seawater base Solid Free clear brine workover fluid and its preparation method and application |
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Citations (4)
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| CN105647491A (en) * | 2015-12-08 | 2016-06-08 | 中国石油天然气集团公司 | Solid-phase-free high density well killing fluid |
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2018
- 2018-09-25 CN CN201811121024.7A patent/CN109054776A/en active Pending
Patent Citations (4)
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| CN105647491A (en) * | 2015-12-08 | 2016-06-08 | 中国石油天然气集团公司 | Solid-phase-free high density well killing fluid |
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| CN107699220A (en) * | 2017-10-11 | 2018-02-16 | 中国海洋石油总公司 | Offshore oilfield well workover offensive well workover liquid system and its preparation method and application |
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Application publication date: 20181221 |
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