CN108276975A - A kind of high-temperature resistant water-based drilling fluid and preparation method thereof - Google Patents
A kind of high-temperature resistant water-based drilling fluid and preparation method thereof Download PDFInfo
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- CN108276975A CN108276975A CN201810175518.7A CN201810175518A CN108276975A CN 108276975 A CN108276975 A CN 108276975A CN 201810175518 A CN201810175518 A CN 201810175518A CN 108276975 A CN108276975 A CN 108276975A
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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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
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The present invention provides a kind of high-temperature resistant water-based drilling fluid and preparation method thereof, the drilling fluid includes 100 parts of water；1~2 part of sodium bentonite；1.0~1.6 parts of pH adjusting agent；2~4 parts of high-temperature stabilizer；Modified 2~4 parts of humic acid fluid loss additive；2~3 parts of high temperature resistance sulfonation class diluent；0.8~1.2 part of high temperature flow pattern regulator；12~18 parts of inorganic salts and heavy weight additive, the dosage of heavy weight additive so that the density of water-base drilling fluid in 2.0~2.4g/cm3In range, high-temperature stabilizer is the micro-nano ball that grain size is 0.1~1 μm；Modified humic acid fluid loss additive is modified to obtain by humic acid through amidation.Embodiment shows high-temperature resistant water-based drilling fluid provided by the invention in 220 DEG C of high temperature, 2.2g/cm3The rheological behavior still under high density with " low viscous height is cut ", is conducive to High angle and horizontal well cutting carring, and filter loss is only 12mL under high-temperature and high-pressure conditions.
Description
Technical field
The present invention relates to petroleum drilling fluid technical field more particularly to a kind of high-temperature resistant water-based drilling fluid and its preparation sides
Method.
Background technology
In recent years, with the continuous expansion of Exploration Domain, deep-well, ultradeep well, exceptional well and Holes of Complicated Wells layout will not
Disconnected to increase, either domestic or external, oil exploration gradually develops to deep formation with marine, and formations drilled condition is increasingly multiple
Miscellaneous, drilling depth is continuously increased, and drillng operation all relies on drilling well fluidity to the solution of deep-well engineering high temperature and high-voltage problem
The improvement of energy.
Drilling fluid researcher achieves certain progress in high temperature resistant drilling fluids system.For example, Chinese invention patent CN
103160259 disclose a kind of water-base drilling fluid resisting 255 DEG C of superhigh temperature, under 245 DEG C~255 DEG C temperature conditions, rheological characteristic
Can still it stablize.Chinese patent CN103361038 discloses a kind of high-temperature high-density fresh-water drilling fluid, uses sodium bentonite
0.2%~1.0%, comb-shaped polymer fluid loss additive 0.2%~1.0%, sulfonated lignite phenolic resin 1%~4%, sulfonated lignite
0.5%~2%, the water of NaOH0.1%~0.5%, barite 60%~75% and surplus, through height after mixing by mass percentage
Warm aging and obtain, be formed by high-temperature high-density fresh-water drilling fluid temperature resistance up to 260 DEG C, density reach 2.6g/cm3.For another example China is special
Sharp CN102002350 discloses a kind of superhigh temperature water base drilling fluid, by weight include 100 parts of water, 1~6 part of sodium bentonite,
0.5~3 part of protective agent for drilling fluids at high temperature, 2~6 parts of high temperature fluid loss additive GLJ-I, 2~6 parts of high temperature fluid loss additive GLJ-II,
2~4 parts of high temperature sealing agent, 0~300 part of barite, the density of obtained drilling fluid is in 2g/cm3Left and right.
Although the Applicable temperature of above-mentioned water-base drilling fluid increases, density also gets a promotion, but high at 200 DEG C or more
Temperature, 2.2g/cm3Drilling fluid plastic viscosity and yield value under high-density state is still larger so that temperature flowing is difficult to control
System is still difficult to meet the requirement of drilling engineering, seriously affects downhole safety, restricts bit speed.
Invention content
In view of this, the present invention provides a kind of high-temperature resistant water-based drilling fluids and preparation method thereof.It is provided by the invention anti-
High temperature aqueous-based drilling fluid has low viscosity and high shear force, rheological characteristic excellent under high temperature and high-density state.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical scheme：
The present invention provides a kind of high-temperature resistant water-based drilling fluids, include the component of following mass parts：100 parts of water；Sodium base is swollen
1~2 part of profit soil, 1.0~1.6 parts of pH adjusting agent, 2~4 parts of high-temperature stabilizer, modified 2~4 parts of humic acid fluid loss additive, height
Warm 2~3 parts of sulfonation class diluent, 0.8~1.2 part of high temperature flow pattern regulator, 12~18 parts of inorganic salts and heavy weight additive；
The dosage of the heavy weight additive is subject to the density of the high-temperature resistant water-based drilling fluid, the high-temperature resistant water-based drilling fluid
Density be 2.0~2.4g/cm3；
The high-temperature stabilizer is by including 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, first
Base acrylic acid, acrylamide, oleic acid diethyl amide and aerosil raw material be prepared；The high-temperature stabilizer is
Micro-nano ball；The grain size of the micro-nano ball is 0.1~1 μm；
The modified humic acid fluid loss additive is modified to obtain by humic acid through amidation；
The pH value of the high-temperature resistant water-based drilling fluid is 8~9.
Preferably, the preparation method of the high-temperature stabilizer includes the following steps：
(1) by the 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methacrylic acid, propylene
Amide, oleic acid diethyl amide and aerosil mixing, obtain raw mixture；
(2) raw mixture for obtaining the step (1) carries out substitution reaction, is taken under the action of initiator
For reactant；The temperature of the substitution reaction is 70~90 DEG C, and the time of substitution reaction is 6~8h；
(3) substituted reactant that the step (2) obtains is mixed with crosslinking agent, carries out polymerisation, it is steady obtains high temperature
Determine agent；The temperature of the polymerisation is 60 DEG C, and the time of polymerisation is 6~8h.
Preferably, 2- acrylamide-2-methylpro panesulfonic acids, N in the raw mixture, N- acrylamides,
Methacrylic acid, acrylamide, oleic acid diethyl amide and aerosil mass ratio be (20~40)：(15~35)：
(20~30)：(15~25)：(30~50)：(2~8).
Preferably, initiator includes ammonium persulfate and benzoyl peroxide in the step (2)；
Crosslinking agent is the mixture of amide compound in the step (3).
Preferably, the preparation method of the modified humic acid fluid loss additive includes the following steps：
(I) by humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids, polyvinylpyrrolidone and
Water mixes, and obtains material solution；
(II) material solution that the step (I) obtains is modified to drying after reacting, obtains modified humic acid drop filter
Lose agent；The temperature of the modified-reaction is 175~185 DEG C, and the time of the modified-reaction is 6~8h.
Preferably, the pH adjusting agent includes sodium hydroxide and sodium carbonate；The quality of the sodium hydroxide and sodium carbonate
Than for (0.5~0.8)：(0.5~0.8).
Preferably, the high temperature resistance sulfonation class diluent is sulfonation tannin.
Preferably, the high temperature flow pattern regulator is dimethacrylamide, diethyl acrylamide, vinyl sulfonic acid, 2-
The five-membered copolymer of acrylamide-2-methylpro panesulfonic acid and vinyl butyrate lactam.
Preferably, the inorganic salts include potassium chloride and sodium chloride；The mass ratio of the potassium chloride and sodium chloride be (2~
3)：(10~15).
The present invention provides the preparation methods of high-temperature resistant water-based drilling fluid described in above-mentioned technical proposal, including：By the water,
Sodium bentonite, pH adjusting agent, high-temperature stabilizer, modified humic acid fluid loss additive, high temperature resistance sulfonation class diluent, high-temperature stream
After type conditioning agent and inorganic salts mixing, heavy weight additive is added, high-temperature resistant water-based drilling fluid is obtained.
The present invention provides a kind of high-temperature resistant water-based drilling fluid and its application, high-temperature resistant water-based drilling fluid includes following quality
The component of part：100 parts of water；1~2 part of sodium bentonite；1.0~1.6 parts of pH adjusting agent；2~4 parts of high-temperature stabilizer；It is modified
2~4 parts of humic acid fluid loss additive；2~3 parts of high temperature resistance sulfonation class diluent；0.8~1.2 part of high temperature flow pattern regulator；Inorganic salts
12~18 parts and heavy weight additive, wherein the dosage of heavy weight additive so that high-temperature resistant water-based drilling fluid density domination 2.0~
2.4g/cm3In range, high-temperature stabilizer is micro-nano ball；The grain size of the micro-nano ball is 0.1~1 μm, modified humic acid drop
Fluid loss agents are modified to obtain by humic acid through amidation.In the present invention, the high-temperature stabilizer rigidity with micro-nano spherical structure
Larger, temperature tolerance and shear resistant are stronger；And micro-nano ball inter-particle friction and overlap joint can enhance fluidic structures viscosity, energy
The overlap joint space for enough occupying Na-bentonite soil particle avoids caused by overlapped end-end or end-face space structure express delivery enhancing
High temperature is thickened.In addition, the high-temperature stabilizer of micro-nano spherical structure has excellent hydrodynamics in drilling fluid
And lubrication property, the temperature sensitivity of drilling fluid can be effectively reduced, reach a high temperature relying on property of current stabilization, while enhancing lubricity；Furthermore
Make drilling fluid in use by introducing amoyl modified humic acid, modified humic acid fluid loss additive can be in clay particle
Sublist face forms effective adsorption layer, improves the f current potentials of clay particle, prevents clay particles from flocculating and becomes larger, there is excellent shield glue to make
With forming thin and compact filter cake, reduce filter loss, improve the rheological characteristic of drilling fluid.In combination with containing sulphur methyl polar group
The molecule of the high temperature resistance sulfonation class diluent of group, can not only improve the mobile performance of drilling fluid, moreover it is possible to play certain drop filter
Mistake acts on.Embodiment the result shows that, high-temperature resistant water-based drilling fluid provided by the invention is in 220 DEG C of high temperature, 2.2g/cm3It is highly dense
Still there is the rheological behavior (plastic viscosity is in 35mPas hereinafter, yield value is in 8Pa or more) of " low viscous height is cut ", favorably under degree
In High angle and horizontal well cutting carring, and filter loss is only 12mL under high-temperature and high-pressure conditions.
Specific implementation mode
The present invention provides the present invention provides a kind of high-temperature resistant water-based drilling fluid, include the component of following mass parts：Water
100 parts；1~2 part of sodium bentonite, 1.0~1.6 parts of pH adjusting agent, 2~4 parts of high-temperature stabilizer, modified humic acid filtrate reducing
2~4 parts of agent, 2~3 parts of high temperature sulfonation class diluent, 0.8~1.2 part of high temperature flow pattern regulator, 12~18 parts of inorganic salts and exacerbation
Agent；
The dosage of the heavy weight additive is subject to the density of the high-temperature resistant water-based drilling fluid, the high-temperature resistant water-based drilling fluid
Density be 2.0~2.4g/cm3；
The high-temperature stabilizer is by including 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, first
Base acrylic acid, acrylamide, oleic acid diethyl amide and aerosil raw material be prepared；The high-temperature stabilizer is
Micro-nano ball；The grain size of the micro-nano ball is 0.1~1 μm；
The modified humic acid fluid loss additive is modified to obtain by humic acid through amidation；
The pH value of the high-temperature resistant water-based drilling fluid is 8~9.
High-temperature resistant water-based drilling fluid provided by the invention includes 100 parts of water in terms of mass parts.The present invention is to the water
Specific source there is no particular/special requirement, using well-known to those skilled in the art.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 1~2 part of sodium bentonite,
Preferably 1.2~1.5 parts.The present invention does not have particular/special requirement to the source of the sodium bentonite, using those skilled in the art
It is known.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes that 1.0~1.6 parts of pH value is adjusted
Agent, preferably 1.2~1.5 parts.In the present invention, the pH adjusting agent preferably includes sodium hydroxide and sodium carbonate；The hydrogen
The mass ratio of sodium oxide molybdena and sodium carbonate is preferably (0.5~0.8)：(0.5~0.8), further preferably 0.5:0.6~0.7.This
Invention uses the pH adjusting agent so that the pH of high-temperature resistant water-based drilling fluid stablizes in 8~9 ranges, further preferably steady
It is scheduled on 9, it is ensured that stable environment.High-temperature resistant water-based drilling fluid provided by the invention can be stably held in the pH under the high temperature conditions
Under the conditions of value.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 2~4 parts of high-temperature stabilizers, excellent
It is selected as 2.5~3 parts.In the present invention, the high-temperature stabilizer is micro-nano ball；The grain size of the micro-nano ball is 0.1~1 μ
M, preferably 0.5~0.8 μm.
The present invention has the rigidity of the polymer composites of micro-nano spherical structure larger, temperature tolerance and shear resistant compared with
By force；And micro-nano ball inter-particle friction and overlap joint can enhance fluidic structures viscosity, can occupy Na-bentonite soil particle
Space is overlapped, the high temperature thickening caused by overlapped end-end or end-face space structure express delivery enhancing is avoided.In addition, in drilling fluid
The high-temperature stabilizer of micro-nano spherical structure has excellent hydrodynamics and lubrication property in fluid, can effectively reduce brill
The temperature sensitivity of well liquid, reach a high temperature relying on property of current stabilization, while enhancing lubricity.
In the present invention, the high-temperature stabilizer is preferably by including 2- acrylamide-2-methylpro panesulfonic acids, N, N- bis-
Ethyl acrylamide, methacrylic acid, acrylamide, the raw material of oleic acid diethyl amide and aerosil are obtained by the reaction
Polymer composites.In the present invention, high surface activity, the heatproof of the high-temperature stabilizer of the polymer composites form
Property is strong, can improve the effect between functionalized polymer inorganic agent and clay particles, promote the dispersion of solid phase particles.
In the present invention, the preparation method of the high-temperature stabilizer preferably includes following steps：
(1) by the 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methacrylic acid, propylene
Amide, oleic acid diethyl amide and aerosil mixing, obtain raw mixture；
(2) raw mixture for obtaining the step (1) carries out substitution reaction, is taken under the action of initiator
For reactant；The temperature of the substitution reaction is 70~90 DEG C, and the time of substitution reaction is 6~8h；
(3) substituted reactant that the step (2) obtains is mixed with crosslinking agent, carries out polymerisation, it is steady obtains high temperature
Determine agent；The temperature of the polymerisation is 60 DEG C, and the time of polymerisation is 6~8h.
The present invention is preferably by the 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, metering system
Acid, acrylamide, oleic acid diethyl amide and aerosil mixing, obtain raw mixture；In the raw mixture
2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methacrylic acid, acrylamide, oleic acid diethanol acyl
The mass ratio of amine and aerosil is preferably (20~40)：(15~35)：(20~30)：(15~25)：(30~50)：(2
~8), further preferably (25~35)：(20~30)：(25~30)：(18~24)：(35~45)：(5~6), more preferably
(25~30)：25：25：20：40：5.In the present invention, described to state 2- acrylamide-2-methylpro panesulfonic acids, N, N- diethyl
The mixing of acrylamide, methacrylic acid, acrylamide, oleic acid diethyl amide and aerosil, further preferably
The oleic acid diethyl amide and aerosil are mixed under agitation first described in being added under agitation again
2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methacrylic acid and acrylamide；Complete the original
After the addition of material, the present invention preferably under the conditions of 50 DEG C, is stirred 2h.The present invention contributes to each group using the hybrid mode
The uniform mixing divided.
After obtaining raw mixture, the present invention preferably carries out the raw mixture by described under the action of initiator
Substitution reaction obtains substituted reactant.In the present invention, the temperature of the substitution reaction is preferably 70~90 DEG C, further excellent
It is selected as 75~85 DEG C, more preferably 80 DEG C；The time of the substitution reaction is preferably 6~8h, further preferably 6.5~
7.5h, more preferably 7h.In the present invention, the initiator preferably includes ammonium persulfate and benzoyl peroxide；The over cure
The mass ratio of sour ammonium and benzoyl peroxide is preferably (1~2)：(1~2), further preferably 1:1.In the present invention, described
The mass ratio that the gross mass of initiator is mixed with the raw material preferably preferably 1:48.
After the substitution reaction, the present invention preferably mixes the obtained substitution reaction product with crosslinking agent, is gathered
Reaction is closed, high-temperature stabilizer is obtained.In the present invention, the temperature of the polymerisation is preferably 60 DEG C；The polymerisation
Time is preferably 6~8h, further preferably 6.5~7.5h, more preferably 7h.In the present invention, the crosslinking agent preferably wraps
Include di-2-ethylhexylphosphine oxide propionamide and N- hydroxyethyl acrylamides；The quality of the di-2-ethylhexylphosphine oxide propionamide and N- hydroxyethyl acrylamides
Than preferably (1~2)：(1~2), most preferably 1:1.In the present invention, the crosslinking agent and preparation substitution reaction initiator
Mass ratio be preferably (1~2)：(1~3), most preferably 1:1.The present invention is under the action of the crosslinking agent, by original long-chain
Polymer molecule chain rupture is crosslinked again, forms it into closed loop, becomes ball-type.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 2~4 parts of modification humic acid drop
Fluid loss agents, further preferably 2.5~3 parts.In the present invention, the modified humic acid fluid loss additive by humic acid through amidation
Modification obtains.The present invention makes drilling fluid in use by introducing amide groups, and modified humic acid fluid loss additive can be
Clay particles surface forms effective adsorption layer, improves the f current potentials of clay particle, prevents clay particles from flocculating and becomes larger, has excellent
Colloid protecting action forms thin and compact filter cake, reduces filter loss, improves the rheological characteristic of drilling fluid.
In the present invention, the preparation method of the modified humic acid fluid loss additive preferably includes following steps：
(I) by humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids, polyvinylpyrrolidone and
Water mixes, and obtains material solution；
(II) material solution that the step (I) obtains is modified to drying after reacting, obtains modified humic acid drop filter
Lose agent；The temperature of the modified-reaction is 175~185 DEG C, and the time of the modified-reaction is 6~8h.
The present invention is preferably by humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids, polyvinyl pyrrole
Alkanone and water mixing, obtain material solution.In the present invention, the concentration of raw material gross mass is preferably in the material solution
25%.In the present invention, humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids in the material solution
Mass ratio with polyvinylpyrrolidone is preferably (40~50)：(6~9)：(8~12)：(4~10)：(2~6), it is further excellent
It is selected as (45~48)：(6~8)：(9~10)：(5~8)：(3~5), more preferably 45：8：10：8：6.The present invention is to the corruption
The source for growing acid does not have particular/special requirement, using well-known to those skilled in the art.In the present invention, the humic acid,
The mixing of sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids, polyvinylpyrrolidone and water further preferably will
After the humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids and polyvinylpyrrolidone mixing, then to
Water is added in mixed raw material.The present invention uses the hybrid mode, contributes to the dissolving of raw material in water.The present invention is to the corruption
The specific source of acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids and polyvinylpyrrolidone is grown without spy
It is different to require, using commercial goods well-known to those skilled in the art.
After the mixing, the material solution preferably is obtained doing after material solution is modified reaction by the present invention by described
It is dry, obtain modified humic acid fluid loss additive.In the present invention, the temperature of the modified-reaction is preferably 175~185 DEG C, into one
Preferably 178~180 DEG C of step；The time of the modified-reaction is preferably 6~8h, further preferably 6.5~7.5h.The present invention
By the modified-reaction, the molecular backbone of obtained modification humic acid fluid loss additive is C-C keys, the inherence knot as high temperature resistance
Structure is keyed between main chain and side chain using C-C and C-S, these bonding pattern thermal stability are strong, enhance fluid loss additive
Temperature resistance ability；And the hydrophilic radical of modified introducing is sulfonic group, has very strong hydration capability, can enhance clay particle table
The hydration shell in face has very strong saline-alkaline tolerance.
In the present invention, the drying is preferably spray-dried；Specific implementation mode of the present invention to the spray drying
There is no particular/special requirement, can realize the removal of moisture.In the present invention, the modified humic acid fluid loss additive is brown-green
Dry powder.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 2~3 parts of high temperature resistance sulfonation class
Diluent, further preferably 2.5~2.8 parts.In the present invention, the high temperature resistance sulfonation class diluent is preferably sulfonation list
Rather.The present invention does not have particular/special requirement to the specific source of the sulfonation tannin, using well-known to those skilled in the art commercially available
Commodity.In the present invention, sulphur methyl polar group is contained in the molecule of the high temperature resistance sulfonation class diluent, it not only can be with
Improve the mobile performance of drilling fluid, moreover it is possible to play the role of certain filtrate reducing.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 0.8~1.2 part of high temperature flow pattern
Conditioning agent, further preferably 1.0 parts.In the present invention, the high temperature flow pattern regulator is preferably dimethacrylamide, two
The copolymer of ethyl acrylamide, vinyl sulfonic acid, 2- acrylamide-2-methylpro panesulfonic acids and vinyl butyrate lactam.At this
In invention, the molecular weight of the high temperature flow pattern regulator is preferably 150~2,000,000, most preferably 1,800,000.In the present invention, institute
State adsorbance of the high temperature flow pattern regulator on clay reduces with the raising of pH, increases with the raising of temperature.
In the present invention, the high temperature flow pattern regulator with polymer-like substances in drilling fluid by forming stable complexing
Object, that breaks the structure that is formed between polymer to alleviate polymer puies forward viscous effect；And polymer shrink can be made to be dehydrated, it can be
It is adsorbed on clay particle, breaks the structure formed between part of clay, furthermore the introducing of sulfonation group substantially increases the height
The temperature resistance of warm flow pattern regulator so that the structure that can also weaken clay formation well at high temperature is effectively improved highly dense
It spends drilling fluids at high temperature and thickens problem.
In the present invention, the preparation method of the high temperature flow pattern regulator preferably includes following steps：
(a) it will include dimethacrylamide, diethyl acrylamide, vinyl sulfonic acid, 2- acrylamido -2- methyl-props
The pH value of the mixture of sulfonic acid and vinyl butyrate lactam is adjusted to 8~9, obtains raw mixture；
(b) raw mixture for obtaining the step (a) carries out polymerisation, obtains height under the action of initiator
Warm flow pattern regulator.
In the present invention, described includes dimethacrylamide, diethyl acrylamide, vinyl sulfonic acid, 2- acrylamides
Dimethacrylamide, diethyl acrylamide, ethylene sulphur in the mixture of base -2- methyl propane sulfonic acids and vinyl butyrate lactam
The mass ratio of acid, 2- acrylamide-2-methylpro panesulfonic acids and vinyl butyrate lactam is preferably (10~20)：(10~20)：
(10~20)：(30~40)：(20~30), further preferably (15~18)：(12~18)：(15~18)：(35~36)：
(24~25).In the present invention, the preparation method of the mixture includes the following steps：By the vinyl sulfonic acid, 2- acryloyls
Amido -2- methyl propane sulfonic acids and lye mixing, obtain the first mixed solution；The vinyl sulfonic acid and 2- acrylamido -2- first
The ratio of the amount of the substance of alkali is preferably equal in the amount and lye of the total material of base propane sulfonic acid；It is added into first mixed solution
The dimethacrylamide, diethyl acrylamide and vinyl butyrate lactam, obtain mixture.In the present invention, described
Alkaline solution is preferably sodium hydroxide solution or potassium hydroxide solution.
After obtaining the mixture, the pH value of the mixture is preferably adjusted to 8~9 by the present invention, obtains raw material mixing
Object.In the present invention, the pH value adjusting is preferably sodium hydroxide with conditioning agent；The dosage of the pH adjusting agent is can obtain
The raw mixture of required pH value.The pH value of the mixture is preferably adjusted to 8~9 by the present invention, further preferably
9。
The present invention carries out polymerisation, obtains height preferably by the obtained raw mixture under the action of initiator
Warm flow pattern regulator.In the present invention, the initiator preferably includes sodium sulphate, azodiisobutyronitrile and sodium pyrosulfite；Institute
The mass ratio for stating sodium sulphate in initiator, azodiisobutyronitrile and sodium pyrosulfite is preferably (1~2)：(1~2)：(1~3),
Most preferably 1:1:1.In the present invention, in the gross mass of the initiator and raw mixture dimethacrylamide quality
Than preferably (0.01~0.5)：(10~20), further preferably (0.05~0.3)：(15~16), more preferably (0.1~
0.15)：15.In the present invention, the temperature of the polymerisation is preferably 85~95 DEG C, further preferably 90 DEG C；It is described poly-
The time for closing reaction is preferably 4~6h, further preferably 4.5~5h.The present invention is described including sodium sulphate, two isobutyl of azo
Under the effect of the initiator of nitrile and sodium pyrosulfite, polymerisation occurs for raw mixture, obtains high temperature flow pattern regulator.
After the polymerisation, the polymeric reaction product is preferably cooled down, dried and crushed by the present invention successively, is obtained
To graininess high temperature flow pattern regulator.The present invention does not have particular/special requirement to the specific implementation mode of the cooling, drying and crushing,
Using well-known to those skilled in the art.
On the basis of the quality of water, high-temperature resistant water-based drilling fluid provided by the invention includes 12~18 parts of inorganic salts, into
One step is preferably 15~16 parts.In the present invention, the inorganic salts preferably include potassium chloride and sodium chloride；The potassium chloride and chlorine
The mass ratio for changing sodium is preferably (2~3)：(10~15), further preferably (2~3)：(12~14).In the present invention, described
The inlay characteristic and sodium ion of inorganic salts combination potassium ion reduce the characteristic of water phase activity to improve the rejection of drilling fluid.
High-temperature resistant water-based drilling fluid provided by the invention includes heavy weight additive；The dosage of the heavy weight additive is with the high temperature resistance water
Subject to the density of base drilling fluid, the density of the high-temperature resistant water-based drilling fluid is 2.0~2.4g/cm3；Preferably 2.1~2.2g/
cm3.In the present invention, the heavy weight additive is preferably barite；The density of the barite is preferably 4.2~4.21g/cm3；Institute
The purity of barite is stated preferably 95% or more.
The present invention also provides the preparation methods of the high-temperature resistant water-based drilling fluid described in above-mentioned technical proposal, including：By institute
State water, sodium bentonite, pH adjusting agent, high-temperature stabilizer, modified humic acid fluid loss additive, high temperature resistance sulfonation class diluent,
After high temperature flow pattern regulator and inorganic salts mixing, heavy weight additive is added, high-temperature resistant water-based drilling fluid is obtained.In the present invention, institute
The density for stating high-temperature resistant water-based drilling fluid is preferably 2.0~2.4g/cm3, further preferably 2.2g/cm3。
In the present invention, the water, sodium bentonite, pH adjusting agent, high-temperature stabilizer, modified humic acid filtrate reducing
Agent, the mixing of high temperature resistance sulfonation class diluent, high temperature flow pattern regulator and inorganic salts are more preferably in stirring at low speed condition
Under, sodium bentonite is added into the water, is stood more than for 24 hours after stirring 20min, obtains prehydration bentonite slurry；In high speed
Under stirring condition, sequentially added into the obtained pre-emulsification bentonite slurry pH adjusting agent, high-temperature stabilizer, inorganic salts,
High-temperature resistant thinner, modified humic acid fluid loss additive and high temperature flow pattern regulator；Under the conditions of high-speed stirred, the present invention is preferably every
A kind of raw material is added, after persistently stirring 10~20min, then is added sequentially subsequent raw material.
In the present invention, the rate of the stirring at low speed is preferably 3000rpm；The rate of the high-speed stirred is preferably
10000~11000rpm.
High-temperature resistant water-based drilling fluid provided by the invention is suitable for offshore oilfield deep water and ultra-deep well drilling well, is a kind of good
High temperature resistance well, highdensity water-base drilling fluid.
High-temperature resistant water-based drilling fluid provided by the invention and preparation method thereof is carried out specifically with reference to embodiment
It is bright, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1：
The preparation of high-temperature stabilizer：
In terms of mass parts, 20 parts of 2- acrylamide-2-methylpro panesulfonic acids, 15 parts of N, N- diethyls are added while agitating
Base acrylamide, 20 parts of methacrylic acids, 15 parts of acrylamides are warming up to 50 DEG C after mixing, and insulated and stirred adds after 2 hours
Entering initiator ammonium persulfate and benzoyl peroxide, keeps reaction temperature between 70 DEG C, reaction is cooled to 60 DEG C after 3 hours,
Crosslinking agent di-2-ethylhexylphosphine oxide propionamide and N- hydroxyethyl acrylamides is added, 60 DEG C of constant temperature reacts 6 hours, discharges steady up to high temperature resistance
Determine agent.
The preparation of modified humic acid fluid loss additive：
In terms of mass parts, in a kettle by 40 parts of humic acid, 6 parts of sodium hydroxides, 8 parts of phenol, 4 parts of 2- acrylamides
Base -2- methyl propane sulfonic acids, 2-6 parts of polyvinylpyrrolidone parts are sufficiently stirred, and are uniformly mixed, and water is then added to be configured to 25% water
Temperature is risen to 180 ± 5 DEG C by solution；After reaction 6 hours, spray-dried tower is dried to brown-green dry powder, and as high temperature resistance drops
Fluid loss agents.
The preparation of high temperature flow pattern regulator：
In terms of mass parts, in a kettle by 10 parts of vinyl sulfonic acids, 30 parts of 2- acrylamide-2-methylpro panesulfonic acids with etc.
The alkaline aqueous solution of mole mixes, and 10 parts of dimethacrylamide, 10 parts of diethyl acrylamides and 20 parts of second are then added
Alkenyl butyrolactam adjusts pH value to 8 with sodium hydroxide, and 0.01 part of sodium peroxydisulfate, azo is added to 90 ± 5 DEG C in heated material
Bis-isobutyronitrile, sodium pyrosulfite mixture make initiator initiation reaction (sodium peroxydisulfate, azodiisobutyronitrile and sodium pyrosulfite
Mass ratio be 1:1:1), the reaction time is 4 hours, cools down material after reaction, and discharge the fine grained dress production that dry, pulverize
Product, as high temperature resistance flow pattern regulator.
The group of high-temperature resistant water-based drilling fluid is divided into：1 part of 100 parts of water, 2 parts of sodium bentonite, pH adjusting agent (sodium hydroxide
Mass ratio with sodium carbonate is 1:1), 3 parts of high-temperature stabilizer, 3 parts of heat resisting fluid loss reducing agent, 3 parts of sulfonation tannin, high temperature flow pattern tune
Save 1 part of agent, (mass ratio of potassium chloride and sodium chloride is 1 to 12 parts of inorganic salts:5), density 4.2g/cm3And purity is 95%
Barite, the density for adjusting drilling fluid are 2.2g/cm3。
Preparation process is as follows：
300mL water is put into height to stir in cup, sodium bentonite is added with 3000rpm stir speed (S.S.)s while stirring, continues to stir
After mixing 20min, stop stirring, curing in airtight condition prehydration bentonite slurry derived above for 24 hours；
In the case where rotating speed is the high-speed stirred state of 11000rpm, add successively according to aforementioned proportion into prehydration bentonite slurry
Enter pH adjusting agent, high-temperature stabilizer, inorganic salts, high-temperature resistant thinner, heat resisting fluid loss reducing agent, high temperature flow pattern regulator, often
Add a kind of material stirring 10min, be eventually adding heavy weight additive, stir, it is 2.2g/cm to obtain density3It is high-temperature resistant water-based
Drilling fluid.
Embodiment 2
Water-base drilling fluid is prepared in the way of embodiment 1, difference lies in 100 parts of water, 1.5 parts of sodium bentonite, pH value
(mass ratio of sodium hydroxide and sodium carbonate is 0.5 to 1.3 parts of conditioning agent:0.8), 2 parts of high-temperature stabilizer, heat resisting fluid loss reducing agent 2
(mass ratio of potassium chloride and sodium chloride is 1 for part, 2 parts of sulfonation tannin, 0.8 part of high temperature flow pattern regulator, 15 parts of inorganic salts:5), close
Degree is 4.2g/cm3And purity be 95% barite adjust drilling fluid density be 2.2g/cm3。
Embodiment 3
Water-base drilling fluid is prepared in the way of embodiment 1, difference lies in 100 parts of water, 1 part of sodium bentonite, pH value tune
Saving 1.6 parts of agent, (mass ratio of sodium hydroxide and sodium carbonate is 0.5:0.8), 4 parts of high-temperature stabilizer, 4 parts of heat resisting fluid loss reducing agent,
(mass ratio of potassium chloride and sodium chloride is 1 for 2.5 parts of sulfonation tannin, 1.2 parts of high temperature flow pattern regulator, 18 parts of inorganic salts:5), close
Degree is 4.2g/cm3And purity be 95% barite adjust drilling fluid density be 2.2g/cm3。
Comparative example 1：
The common Sulphonated polymer mud system in scene, the weight percent of wherein each component are：100 parts of water, sodium bentonite 1
(mass ratio of sodium hydroxide and sodium carbonate is 1 for part, 0.5 part of pH adjusting agent:1), 2 parts of high-temperature stabilizer, sulfonated lignite resin 3
Part, 4 parts of sulfonation tannin, high temperature resistance, which carry, cuts 3 parts of fluid loss additive, 8 parts of potassium chloride, 2 parts of sodium formate, and being eventually adding blanc fixe will bore
The density of well liquid system is adjusted to 2.2g/cm3。
Examples 1 to 3 and comparative example 1 are obtained into water-base drilling fluid, respectively under the conditions of 220 DEG C after heat rolling 16h, according to water
Base drilling fluid test program (GB/T 16783-1997) measures traditional performance respectively, and test result is as shown in table 1.
The traditional performance comparison of water-base drilling fluid in 1 Examples 1 to 3 of table and comparative example 1
Note：ρ-density；AV-apparent viscosity；PV-plastic viscosity；YP-yield value；Gel (10s/10min)-ingress/
Egress；HTHP-high temperature and high pressure filter loss, temperature are 180 DEG C, pressure 3.5MPa；PH value is that the acid-base property of drilling fluid itself is surveyed
Test result.
As it can be seen from table 1 high-temperature resistant water-based drilling fluid rheology provided by the invention is good, and compared with comparative example, table
Seeing viscosity and yield value and having significantly reduces, and larger space, and high temperature and pressure leak-off are left for the adjusting of later stage flow pattern
Amount is smaller, is conducive to wellbore stability.
In order to verify the temperature resistance ability of water-base drilling fluid provided by the present invention, respectively prepared by Examples 1 to 3 water base
Heat rolling is tested for the property after 16 hours in the environment of drilling fluid is placed in 180 DEG C, 200 DEG C, 220 DEG C, 240 DEG C, and test result is such as
Shown in table 2.
The temperature resistance merit rating for the water-base drilling fluid that 2 Examples 1 to 3 of table obtains
From table 2 it can be seen that the heat-resisting property of high-temperature resistant water-based drilling fluid provided by the invention is good, temperature significantly
When fluctuation, drilling fluid rheology variation is little, can keep stable.
In order to verify the contamination resistance of high-temperature resistant water-based drilling fluid provided by the present invention, respectively to Examples 1 to 3 system
5% sodium bentonite, 9% sodium bentonite, 12% sodium bentonite of drilling fluid quality are added in standby water-base drilling fluid, and
It is tested for the property after 220 DEG C of heat are rolled 16 hours, test result is as shown in table 3.
The contamination resistance test of water-base drilling fluid prepared by 3 Examples 1 to 3 of table
From table 3 it can be seen that the anti-bentonite of high-temperature resistant water-based drilling fluid provided by the invention is invaded, dirty ability is stronger, and sodium is swollen
When profit soil invades dirt to 12wt%, still there is good rheological characteristic, high temperature and high pressure filter loss is in 15mL hereinafter, this shows the system
With stronger inhibition, it can preferably inhibit clay aquation pulping, disclosure satisfy that field demand.
As seen from the above embodiment, the present invention provides a kind of high-temperature resistant water-based drilling fluid, by adding high-temperature stabilizer, resisting
High temperature fluid loss additive, high temperature flow pattern regulator, obtain the drilling well that a kind of high-temperature resistance is strong, filter loss is small and rheological characteristic is excellent
Liquid overcomes drilling fluid under high-temperature high-density state and thickens serious, contamination resistance difference disadvantage；High temperature resistance provided by the invention
Water-base drilling fluid is in 220 DEG C of high temperature, 2.2g/cm3Still (plastic viscosity exists the rheological behavior with " low viscous height is cut " under high density
35mPas hereinafter, yield value in 8Pa or more), be conducive to High angle and horizontal well cutting carring, and under high-temperature and high-pressure conditions
Filter loss is only 12mL, it is seen that the drilling fluid that can be used in ultra-deep well drilling well can overcome common deep well drilling fluid
The problems such as the anti-high density ability of high temperature resistance is limited, and easy high-temperature thickening causes rheological characteristic to be difficult to control, and maintenance period is frequent.The present invention
The high-temperature resistant water-based drilling fluid provided is suitable for offshore oilfield deep water and ultra-deep well drilling well, is a kind of good high temperature resistance, height
The water-base drilling fluid of density.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of high-temperature resistant water-based drilling fluid, includes the component of following mass parts：100 parts of water；1~2 part of sodium bentonite, pH value
1.0~1.6 parts of conditioning agent, 2~4 parts of high-temperature stabilizer, modified 2~4 parts of humic acid fluid loss additive, high temperature sulfonation class diluent 2
~3 parts, 0.8~1.2 part of high temperature flow pattern regulator, 12~18 parts of inorganic salts and heavy weight additive；
The dosage of the heavy weight additive is subject to the density of the high-temperature resistant water-based drilling fluid, the high-temperature resistant water-based drilling fluid it is close
Degree is 2.0~2.4g/cm3；
The high-temperature stabilizer is by including 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methyl-prop
Olefin(e) acid, acrylamide, oleic acid diethyl amide and aerosil raw material be prepared；The high-temperature stabilizer is micro-nano
Rice ball；The grain size of the micro-nano ball is 0.1~1 μm；
The modified humic acid fluid loss additive is modified to obtain by humic acid through amidation；
The pH value of the high-temperature resistant water-based drilling fluid is 8~9.
2. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the preparation method of the high-temperature stabilizer
Include the following steps：
(1) by the 2- acrylamide-2-methylpro panesulfonic acids, N, N- acrylamides, methacrylic acid, acryloyl
Amine, oleic acid diethyl amide and aerosil mixing, obtain raw mixture；
(2) raw mixture for obtaining the step (1) carries out substitution reaction under the action of initiator, and it is anti-to obtain substitution
Answer object；The temperature of the substitution reaction is 70~90 DEG C, and the time of substitution reaction is 6~8h；
(3) substituted reactant that the step (2) obtains is mixed with crosslinking agent, carries out polymerisation, obtains high-temperature stabilizer；
The temperature of the polymerisation is 60 DEG C, and the time of polymerisation is 6~8h.
3. high-temperature resistant water-based drilling fluid according to claim 2, which is characterized in that 2- acryloyls in the raw mixture
Amido -2- methyl propane sulfonic acids, N, N- acrylamides, methacrylic acid, acrylamide, oleic acid diethyl amide and gas phase
The mass ratio of silica is (20~40)：(15~35)：(20~30)：(15~25)：(30~50)：(2~8).
4. high-temperature resistant water-based drilling fluid according to claim 2, which is characterized in that initiator includes in the step (2)
Ammonium persulfate and benzoyl peroxide；
Crosslinking agent is the mixture of amide compound in the step (3).
5. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the modified humic acid fluid loss additive
Preparation method includes the following steps：
(I) humic acid, sodium hydroxide, phenol, 2- acrylamide-2-methylpro panesulfonic acids, polyvinylpyrrolidone and water are mixed
It closes, obtains material solution；
(II) material solution that the step (I) obtains is modified to drying after reacting, obtains modified humic acid fluid loss additive；
The temperature of the modified-reaction is 175~185 DEG C, and the time of the modified-reaction is 6~8h.
6. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the pH adjusting agent includes hydroxide
Sodium and sodium carbonate；The mass ratio of the sodium hydroxide and sodium carbonate is (0.5~0.8)：(0.5~0.8).
7. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the high temperature resistance sulfonation class diluent is
Sulfonation tannin.
8. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the high temperature flow pattern regulator is diformazan
Base acrylamide, diethyl acrylamide, vinyl sulfonic acid, 2- acrylamide-2-methylpro panesulfonic acids and vinyl butyrate lactam
Five-membered copolymer.
9. high-temperature resistant water-based drilling fluid according to claim 1, which is characterized in that the inorganic salts include potassium chloride and chlorine
Change sodium；The mass ratio of the potassium chloride and sodium chloride is (2~3)：(10~15).
10. the preparation method of high-temperature resistant water-based drilling fluid described in claim 1~9 any one, including：By the water, sodium base
Bentonite, pH adjusting agent, high-temperature stabilizer, modified humic acid fluid loss additive, high temperature resistance sulfonation class diluent, high temperature flow pattern tune
After saving agent and inorganic salts mixing, heavy weight additive is added, high-temperature resistant water-based drilling fluid is obtained.
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