CN106318351A - Clay-free phase water-in-oil drilling fluid and preparation method thereof - Google Patents
Clay-free phase water-in-oil drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention provides a clay-free phase water-in-oil drilling fluid and a preparation method thereof. The drilling fluid includes: 15%-75% of base oil; 3%-33% of saline; 0.8%-5% of a shear strength improving agent; 0.4%-6% of an emulsifier; 0.3%-3% of an alkalinity regulator; 0.5-3% of a filtrate reducer; and 0-75% of a weighting material. The shear strength improving agent is selected from a styrene-acrylate copolymer, a styrene-acrylic acid copolymer, a styrene-C4-6 diene copolymer, a hydrogenated styrene-C4-6 diene copolymer, liquid polyisoprene, an ethylene-propylene copolymer or polyamide 650. The clay-free phase water-in-oil drilling fluid provided by the invention has the advantages of low cost, wide application range, adjustable oil-water ratio in the range of 7:3-9:1, adjustable density in the range of 0.9-2.2g/cm<3>, and good rheological properties, suspension stability and filtrate loss control ability at 80-150DEG C.
Description
Technical field
The present invention relates to oil base drilling fluid technical field, particularly relate to a kind of without soil phase Water-In-Oil drilling fluid and
Its preparation method.
Background technology
Drilling fluid is the circulation flushing medium used in boring in drilling process, mainly by disperse medium (even
Continuous phase), dispersion phase and additive composition.According to the difference of fluid media (medium), drilling fluid can be divided into generally
Water-base drilling fluid, oil base drilling fluid and gaseous type drilling fluid three types.Wherein, oil base drilling fluid tool
There are anti sloughing effectiveness is good, contamination resistance is strong, good heat stability and the feature of lubricity, particularly suitable
In the water-sensitive formation that easily collapses, Temperature Deep interval, low pressure and low permeability stratum, directional well and ocean deepwater drilling.
Water-In-Oil drilling fluid is with oil as continuous phase, and water is dispersion phase, the drilling fluid system formed in conjunction with inorganic agent,
Its advantage with oil base drilling fluid.
The performance of drilling fluid and technical specification include a lot of item, such as density, viscosity, shear force and filter loss etc.
Deng.Wherein, the shear force of oil base drilling fluid directly influences and takes rock effect, barite sedimentation, equivalent circulation
Density, surge pressure etc., the most suitably control shear force and keep it stable, could successfully drill Holes of Complicated Wells,
The well section that especially deep well, hp-ht well and ' Safe Density Windows are narrow.At present, conventional oil base drilling well
Liquid uses organoclay to provide glutinous shear force, and organoclay is by hydrophilic bentonite and quaternaries cation surface
The oleophylic clay that activating agent is made after interacting.But, organoclay also exists and activates slow, Yi Gao
Temperature thickening, plastic viscosity is higher, is unfavorable for the shortcomings such as on-site maintenance, thus can reduce oil base drilling fluid
In service life, reduce solid content, and easily pollute low permeability reservoir.Therefore, recent domestic is successively
Carry out the correlational study without soil phase oil base drilling fluid.
Patent US7572755 discloses using the mixture of saxol and refined mineral oil as continuous phase
The drilling fluid system of Water-In-Oil without the soil phase, its use vinyl esters oil-soluble polymers improve drilling fluid
Oil phase viscosity, forms high-performance low breakdown point colloid, and can significantly reduce mud leakage.Described without the soil phase
Water-In-Oil drilling fluid improves the glutinous shear force of system mainly by vinyl esters oil-soluble polymers, controls stream
Degeneration and suspension stability, but it is relatively costly, is unfavorable for popularization and application.
Summary of the invention
In view of this, the purpose of the application is to provide a kind of without soil phase Water-In-Oil drilling fluid and preparation side thereof
Method, the drilling fluid that the application provides has good rheological characteristic and suspension stability, and cost is relatively low.
The present invention provides a kind of without soil phase Water-In-Oil drilling fluid, including following components in percentage by weight:
The base oil of 15%～75%；
The saline of 3%～33%；
The extracting and cutting agent of 0.8%～5%, described extracting and cutting agent selected from copolymer in cinnamic acrylic ester, styrene-
Acrylic copolymer, styrene-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers,
Liquid polyisoprene, ethylene-propylene copolymer or polyamide 6 50；
The emulsifying agent of 0.4%～6%；
The alkalinity regulator of 0.3%～3%；
0.5～the fluid loss additive of 3%；
0～the weighting material of 75%.
Preferably, the density of described drilling fluid is 0.9g/cm3～2.2g/cm3。
Preferably, described base oil is selected from 0#Diesel oil or 5#White oil.
Preferably, described saline is in calcium chloride water, sodium-chloride water solution and potassium chloride solution
One or more.
Preferably, at least one in calcium oxide and magnesium oxide of described alkalinity regulator.
Preferably, described weighting material is selected from barite, Iron Ore Powder or mangano-manganic oxide.
Preferably, described fluid loss additive is selected from oxidized asphalt or humic acid acetamide.
Preferably, described emulsifying agent includes primary emulsion and auxiliary emulsifying agent, and described primary emulsion is selected from C12～22
Alkyl fatty acid amide；
Described auxiliary emulsifying agent is selected from C8～14 alkyl fatty acid amide.
Preferably, described emulsifying agent includes the primary emulsion of 0.2%～3% and the auxiliary emulsifying agent of 0.2%～3%.
The present invention also provides for the preparation method of a kind of drilling fluid of Water-In-Oil without the soil phase, comprises the following steps:
By weight percentage, by 15%～75% the breast of the saline of base oil, 3%～33%, 0.4%～6%
The weighting material of the fluid loss additive of the alkalinity regulator of agent, 0.3%～3%, 0.5%～3%, 0～75% and
The extracting and cutting agent mixing of 0.8%～5%, obtains without soil phase Water-In-Oil drilling fluid；
Described extracting and cutting agent is selected from copolymer in cinnamic acrylic ester, Styrene-acrylic copolymer, styrene
-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers, liquid polyisoprene, second
Alkene-propylene copolymer or polyamide 6 50.
Compared with prior art, the application can use Styrene And Chloroalkyl Acrylates in the case of without organoclay
Ester copolymer, Styrene-acrylic copolymer, styrene-C4～6 diene copolymers, hydrogenated styrene
-C4～6 diene copolymers, liquid polyisoprene, ethylene-propylene copolymer or polyamide 6 50 conduct
Extracting and cutting agent, and use emulsifying agent and fluid loss additive etc. to make without soil phase Water-In-Oil drilling well for main inorganic agent
Liquid.The described drilling fluid cost of Water-In-Oil without the soil phase is relatively low, applied widely, and its oil-water ratio can be at 7:3～9:1
Between adjustable, density can be at 0.9g/cm3～2.2g/cm3Between adjustable, have in the range of 80 DEG C～150 DEG C
Preferably rheological property, suspension stability and Filtrate Loss Control ability.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the nanometer laser grain size analysis figure of the embodiment of the present invention 1 gained extracting and cutting agent.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The invention provides a kind of without soil phase Water-In-Oil drilling fluid, including following components in percentage by weight:
The base oil of 15%～75%；
The saline of 3%～33%；
The extracting and cutting agent of 0.8%～5%, described extracting and cutting agent selected from copolymer in cinnamic acrylic ester, styrene-
Acrylic copolymer, styrene-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers,
Liquid polyisoprene, ethylene-propylene copolymer or polyamide 6 50；
The emulsifying agent of 0.4%～6%；
The alkalinity regulator of 0.3%～3%；
0.5～the fluid loss additive of 3%；
0～the weighting material of 75%.
For improving the technical merit of domestic oil base drilling fluid, improving oil base drilling fluid system, the present invention proposes
A kind of can with diesel oil or white oil the drilling fluid of Water-In-Oil without the soil phase as base oil, its cost is relatively low, and has good
Good rheological characteristic, suspension stability and Filtrate Loss Control ability etc..
By weight percentage, the drilling fluid of Water-In-Oil without the soil phase that the present invention provides includes the base of 15%～75%
Oil, preferably includes the base oil of 18.7%～74.3%.In an embodiment of the present invention, described base oil is diesel oil
Or white oil, low cost and applied widely.The source of described base oil is not particularly limited by the present invention, institute
State base oil and preferably be selected from 0#Diesel oil or 5#White oil.
By weight percentage, the described drilling fluid of Water-In-Oil without the soil phase includes the saline of 3%～33%, preferably
Including the saline of 3.2%～31.5%.Described saline is the aqueous phase in Water-In-Oil drilling fluid, preferably is selected from calcium chloride
(CaCl2) aqueous solution, one in sodium chloride (NaCl) aqueous solution and potassium chloride (KCl) aqueous solution
Or multiple, more preferably calcium chloride water.The mass concentration of described saline can be 20%～30%；At this
Invention an embodiment in, described saline be mass concentration be the CaCl of 20%2Aqueous solution.
By weight percentage, the described drilling fluid of Water-In-Oil without the soil phase includes the alkalinity regulator of 0.3%～3%,
Preferably include the alkalinity regulator of 0.5%～2.6%.Described alkalinity regulator preferably is selected from calcium oxide and magnesium oxide
In at least one, more preferably calcium oxide.
By weight percentage, the described drilling fluid of Water-In-Oil without the soil phase includes the emulsifying agent of 0.4%～6%, excellent
Choosing includes the emulsifying agent of 1%～5.2%.In a preferred embodiment of the invention, described emulsifying agent includes main breast
Agent and auxiliary emulsifying agent.Wherein, described primary emulsion is chain alkyl fatty acid amide, preferably is selected from C12～22
Alkyl fatty acid amide.Described auxiliary emulsifying agent is short-chain alkyl fatty acid amide, preferably is selected from C8～14 alkyl
Fatty acid amide.In one embodiment of the invention, described emulsifying agent includes the main emulsifying of 0.2%～3%
Agent and the auxiliary emulsifying agent of 0.2%～3%, preferably include the primary emulsion and 0.5%～2.6% of 0.5%～2.6%
Auxiliary emulsifying agent.In an embodiment of the present invention, the alkyl chain of described chain alkyl fatty acid amide and short chain
The alkyl chain of alkyl fatty acid amide is not single, respectively in above-mentioned scope.
By weight percentage, the described drilling fluid of Water-In-Oil without the soil phase includes the fluid loss additive of 0.5～3%, excellent
Choosing includes the fluid loss additive of 0.6%～1.8%.In the present invention, described fluid loss additive preferably is selected from oxidized asphalt
Or humic acid acetamide.The source of described fluid loss additive is not particularly limited by the present invention, uses corresponding city
Sell product.
By weight percentage, the described drilling fluid of Water-In-Oil without the soil phase includes the extracting and cutting agent of 0.8%～5%, excellent
Choosing includes the extracting and cutting agent of 1.0%～4.8%.Owing to the foreign minister in water-in-oil based water drilling fluid is nonpolar oil phase,
Being difficult to form stronger interaction force by hydrogen bond etc. compared with water-base drilling fluid, therefore, the present invention adopts
With copolymer in cinnamic acrylic ester, Styrene-acrylic copolymer, styrene-C4～6 alkadienes copolymerization
Thing, hydrogenated styrene-C4～6 diene copolymers, liquid polyisoprene, ethylene-propylene copolymer or
Polyamide 6 50 is extracting and cutting agent, to realize viscosity and the shear force of drilling fluid, and with drilling fluid in other process
Agent has good compatibility.
In the present invention, described extracting and cutting agent preferably be selected from weak cross-linked styrene-acrylate copolymer, styrene-
Acrylic copolymer, styrene-isoprene copolymer, hydrogenated styrene isoprene copolymer, benzene second
Alkene-butadiene copolymer, hydrogenated styrene-butadiene copolymer, liquid polyisoprene, ethylene-propylene
Copolymer or polyamide 6 50.The source of described extracting and cutting agent is not particularly limited by the present invention, can make voluntarily
For obtaining, it is also possible to commercially obtain.In an embodiment of the present invention, described extracting and cutting agent adds
Quality is 0#Diesel oil 4% time, apparent viscosity is 20mPa s～50mPa s wherein, and ratio of dynamic shear force/yield value to plastic viscosity exists
Between 0.2～1.35.In one embodiment of the invention, described hydrogenated styrene-C4～6 alkadienes copolymerization
The degree of hydrogenation of thing can be 80%～100%.
In a preferred embodiment of the invention, described extracting and cutting agent has a Formulas I structure:
Formulas I；
In Formulas I, 0.2≤x≤0.5,0≤y≤0.2,0.4≤z≤0.8,0.001≤w≤0.02；
R1Selected from formula 1, formula 2 or the group shown in formula 3:
Formula 1；-CH2CH2CONHCH2NHCOCH2CH2-formula 2；Formula 3, wherein, n1 is selected from 2,4 or 6；
R3For the group shown in formula 4:
Formula 4, wherein, n2 is selected from 0,1,3 or 5；
R4Selected from the group shown in formula 5 or formula 6:
Formula 5, wherein, n3 is selected from 9,11,13,15,17,21 or 25；
Formula 6；
R2For phenyl；
R5、R6And R7Independently selected from hydrogen or methyl.
In a preferred embodiment of the invention, described extracting and cutting agent has Formulas I structure, and it belongs to weak crosslinking benzene second
Alkene-acrylate copolymer, has good adhesion-promoting and carries and cut performance.In Formulas I, R1Selected from formula 1, formula 2
Or the group shown in formula 3, R1Play crosslinked action, can guarantee that polymer disperses in oil phase and do not dissolves；
R1The size of the degree of cross linking not only affects the size of cross-linked network, and affect long alkyl chain unfold degree,
Thus affect polymer thickening in oil phase simultaneously and carry and cut performance.
In the embodiment of the present invention has the extracting and cutting agent of Formulas I structure, R2For phenyl (C6H5-)；R2For just
Property circulus, mainly affect the heat-resisting property of polymer.R3For the group shown in formula 4, R4Selected from formula
5 or formula 6 shown in group；R3And R4For the ester group with different length alkyl chain, can guarantee that polymer
And the interaction between the compatibility and the polymer molecule of oil, mainly affects polymer in oil phase
Structural capacity and suspending stabilized performance.In the present invention, R5、R6And R7Independently selected from hydrogen (H) or first
Base (CH3-).Further, x, y and z are the molal quantity of each monomer forming polymer；W is poly-for being formed
The cross-linking agent of compound accounts for the percentage ratio of monomer summation.In the present invention, 0.2≤x≤0.5；0≤y≤0.2；
0.4≤z≤0.8；0.001≤w≤0.02, preferably 0.004≤w≤0.01.
In the presence of without organoclay, viscosity and the shear force of drilling fluid it is difficult to ensure that, and above building stone and
Its ratio is all the key point determining extracting and cutting agent performance of the present invention.The application extracting and cutting agent it is crucial that ensure
It is dispersed in nonpolar oil phase, and can form certain structural capacity from each other, and suspension adds
Heavy material and carry drilling cuttings, thus ensure the combination property of drilling fluid.Particularly, the embodiment of the present invention
Use extracting and cutting agent can quickly swelling dispersion in oil phase, formed have rigid nuclear, flexibility shell microgranule,
Wherein, rigid nuclear plays suspension support effect, can mutually be wound certain structural capacity between flexible shell,
In oil phase, finally form the soliquid with certain viscosity and shear force, thus play control drilling fluid
Rheological property and the effect of suspension stability.It addition, add described extracting and cutting agent in drilling fluid, can be effective
Increasing liquid phase viscosity, increase leak-off resistance, therefore it may also function as the effect of auxiliary reduction filter loss.
In embodiments of the present invention, the particle diameter of the extracting and cutting agent described in Formulas I structure is preferably
80nm～120nm, more preferably 90nm～100nm.In one embodiment of the invention, carry described in and cutting
The particle diameter of agent is 96nm；Owing to its specific surface area is big, oil phase is more easy to dispersion and forms soliquid.
Concrete, in one embodiment of the invention, described extracting and cutting agent can have a Formula II structure:
Formula II.
The source of the described extracting and cutting agent with Formulas I structure is not particularly limited by the embodiment of the present invention, preferably presses
Prepare according to following methods:
A) oil phase material is added in aqueous phase material and carry out emulsifying, obtain O/w emulsion；
Described aqueous phase material includes water, emulsifying agent and the first initiator, and described first initiator is selected from azo
Class initiator or acyl class peroxide initiator；
Described oil phase material include the first monomer of 1～20 weight portions, 0～15 weight portion second comonomer,
The Third monomer of 10～50 weight portions and the cross-linking agent of 0.1～0.5 weight portion, described cross-linking agent is selected to diethyl
Alkenyl benzene, 1,4-butanediol dimethylacrylate, ethylene glycol dimethacrylate or N, N di-2-ethylhexylphosphine oxide
Acrylamide, described first monomer is selected from styrene or α-methyl styrene, and described second comonomer has formula
7 structures, described Third monomer has formula 8 structure or formula 9 structure；
Formula 7, wherein, n2 is selected from 0,1,3 or 5；
Formula 8, wherein, n3 is selected from 9,11,13,15,17 or 21；
Formula 9；Wherein, R8、R9And R10Independently selected from hydrogen or methyl；
B) by step A) O/w emulsion that obtains carries out polyreaction in the presence of the second initiator,
To extracting and cutting agent；Described second initiator is selected from persulfuric acid salt initiator or hydroperoxide kind initiator.
Oil phase material is added in aqueous phase material by method made above, adds rear emulsifying certain time, obtains
Stable O/w emulsion.
In method made above, described oil phase material includes the first monomer, 0～15 of 1～20 weight portions
The second comonomer of weight portion, 10～50 weight portion Third monomer and the cross-linking agent of 0.1～0.5 weight portion.Its
In, described oil phase material preferably includes the first monomer of 1.17～18.75 weight portions, described first monomer choosing
From styrene or α-methyl styrene.Described oil phase material preferably includes the second list of 0～10.45 weight portions
Body, described second comonomer has formula 7 structure, and the most described second comonomer is selected from acrylic acid methyl ester., methyl-prop
E pioic acid methyl ester, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate,
Hexyl 2-propenoate or N-Hexyl methacrylate.
Described oil phase material preferably includes the Third monomer of 10.06～45.41 weight portions, and described Third monomer has
Have formula 8 structure or formula 9 structure, the most described Third monomer selected from decyl acrylate, decyl-octyl methacrylate,
Dodecyl acrylate (lauryl acrylate), lauryl methacrylate (lauryl methacrylate),
Tetradecyl acrylate, tetradecyl methylacrylate, Process Conditions of Cetane Acrylate, hexadecyl metrhacrylate, third
Olefin(e) acid octadecyl ester, octadecyl methacrylate, Behenyl acrylate, methacrylic acid 20 diester,
Isodecyl acrylate or isodecyl methacrylate.
Described oil phase material preferably includes the cross-linking agent of 0.11～0.39 weight portion, and described cross-linking agent is selected to two
Vinyl benzene, 1,4-butanediol dimethylacrylate (i.e. dimethacrylate 1,4-butanediol ester), second
Diol dimethacrylate (i.e. Ethylene glycol dimethacrylate) or N, N methylene-bisacrylamide.
Described oil phase material prepares the most in accordance with the following methods: by above-mentioned each monomer and cross-linking agent in temperature be
Mix under conditions of 40 DEG C, obtain oil phase material.In one embodiment of the invention, 1.17～18.75 are weighed
First monomer of weight portion, 0～10.45 second comonomer, 10.06～45.41 weight portion the 3rd single of weight portion
The cross-linking agent of body and 0.11～0.39 weight portion, in beaker, is stirred for oil phase at 40 DEG C.
In method made above, described aqueous phase material includes water, emulsifying agent and the first initiator.Wherein,
Described first initiator is selected from azo-initiator or acyl class peroxide initiator, preferably is selected from azo two different
One or many in butyronitrile, 2,2'-Azobis(2,4-dimethylvaleronitrile), azo diisobutyl ether hydrochlorate and dibenzoyl peroxide
Kind.Described aqueous phase material preferably includes the first initiator of 0.05～0.3 weight portion, more preferably includes
First initiator of 0.06～0.24 weight portion.
In described aqueous phase material, described emulsifying agent preferably includes the first emulsifying agent and the second emulsifying agent.Described
First emulsifying agent preferably is selected from OPEO, polyoxyethylene sorbitan ether stearate and gathers
One or more in ethylene glycol monolaurate；Described second emulsifying agent preferably be selected from sodium lauryl sulphate,
One or more in dodecylbenzene sodium sulfonate and cetyl trimethylammonium bromide.Described aqueous phase material
Preferably include the first emulsifying agent of 1～5 weight portions, more preferably include the first emulsifying of 1.45～3.04 weight portions
Agent；Described aqueous phase material preferably includes the second emulsifying agent of 0.5～3 weight portions, more preferably includes 0.96～2.26
Second emulsifying agent of weight portion.
Described aqueous phase material, with water as main material, preferably includes the water of 45～80 weight portions, more preferably wraps
Include the water of 47.80～76.68 weight portions；Described water is usually distilled water.In one embodiment of the invention,
Described aqueous phase material includes the water of 45～80 weight portions, 1～5 first emulsifying agent, 0.5～3 weight of weight portion
Second emulsifying agent of part and the first initiator of 0.05～0.3 weight portion.
Described aqueous phase material prepares the most in accordance with the following methods: by water, emulsifying agent and the first initiator in temperature
Degree mixes under conditions of being 40 DEG C, obtains aqueous phase material.In one embodiment of the invention, weigh
The water of 47.80～76.68 weight portions, 1.45～3.04 first emulsifying agent, 0.96～2.26 weight portions of weight portion
First initiator of the second emulsifying agent and 0.06～0.24 weight portion is placed in four-hole boiling flask, stirs at 40 DEG C
It is dissolved into aqueous phase.
Being in terms of 100 by parts by weight, above-mentioned oil phase is added aqueous phase by Dropping funnel by method made above,
Preferably drip off in 30min～60min, maintain stirring to carry out emulsifying, obtain O/w emulsion.Wherein,
The rotating speed of described stirring is preferably 400rpm～600rpm；The time of described emulsifying is preferably 1hr～2hr, on
State oil phase and aqueous phase is mixed into stable O/w emulsion.
After obtaining O/w emulsion, method made above is heated up, and adds the second initiator, preferably exists
Carry out polyreaction under conditions of stirring, obtain oil polymer dispersion type.
In method made above, described second initiator is selected from persulfuric acid salt initiator or hydrogen peroxide
Class initiator, preferably is selected from potassium peroxydisulfate, Ammonium persulfate., hydrogen peroxide and tert-butyl hydroperoxide
Plant or multiple.The temperature of described polyreaction is preferably 70 DEG C～85 DEG C；The time of described polyreaction is preferred
For 6h～9h.In one embodiment of the invention, the O/w emulsion obtained is warming up to 70 DEG C～85 DEG C,
Add 0.1～0.5 weight portion, be preferably added to the second initiator of 0.13～0.44 weight portion, stirring reaction
6h～9h, obtains oil polymer dispersion type, i.e. obtains oil base drilling fluid extracting and cutting agent.The oil that the present invention prepares
Polymer dispersion type has good adhesion-promoting and carries and cut performance, it is adaptable to without soil phase oil base drilling fluid；Simultaneously its
Synthetic method is simple and less pollution.
Except above-mentioned emulsifying agent, alkalinity regulator, fluid loss additive and extracting and cutting agent etc., with percentage by weight
Meter, the described drilling fluid of Water-In-Oil without the soil phase includes the weighting material of 0～75%, preferably includes 0～74.8%
Weighting material.In an embodiment of the present invention, the described drilling fluid of Water-In-Oil without the soil phase may not include and adds dense timber
Material, the percentage by weight of the most described weighting material is 0；And the addition of described weighting material, then it is more conducive to adjust
The density etc. of whole drilling fluid, to meet the probing needs of dissimilar well.In the present invention, increase the weight of described in
Material preferably is selected from barite, Iron Ore Powder or mangano-manganic oxide.Described weighting material can use commercially available prod,
Such as the drilling fluid activation Iron Ore Powder using Kuche County of Xinjiang Ta Bei mud materials company limited to provide.At this
In inventive embodiment, the density of described drilling fluid can be 0.9g/cm3～2.2g/cm3, it is preferably
1.2g/cm3～2.0g/cm3。
For improving the performance of drilling fluid further, the drilling fluid of Water-In-Oil without the soil phase that the present invention provides also can wrap
Include the inorganic agents such as wetting agent.
The composition of the drilling fluid of Water-In-Oil without the soil phase that the embodiment of the present invention is provided is predominantly: base oil, saline,
Extracting and cutting agent, fluid loss additive, primary emulsion, auxiliary emulsifying agent and alkalinity regulator, its oil-water ratio and density can
Adjust, there is in certain temperature range preferable rheological property, suspension stability and Filtrate Loss Control ability,
Cost is relatively low and applied widely, is beneficial to application.
Accordingly, present invention also offers the preparation method of a kind of drilling fluid of Water-In-Oil without the soil phase, including with
Lower step:
By weight percentage, by 15%～75% the breast of the saline of base oil, 3%～33%, 0.4%～6%
The weighting material of the fluid loss additive of the alkalinity regulator of agent, 0.3%～3%, 0.5%～3%, 0～75% and
The extracting and cutting agent mixing of 0.8%～5%, obtains without soil phase Water-In-Oil drilling fluid；
Described extracting and cutting agent is selected from copolymer in cinnamic acrylic ester, Styrene-acrylic copolymer, styrene
-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers, liquid polyisoprene, second
Alkene-propylene copolymer or polyamide 6 50.
The embodiment of the present invention is separately added into the extracting and cutting agent of above percentage by weight, emulsifying agent and alkali in base oil
The inorganic agents such as degree regulator, stirring makes mix homogeneously, obtains without soil phase Water-In-Oil drilling fluid.
In the present invention, described base oil is consistent with content mentioned above, at this with inorganic agents such as extracting and cutting agent
Repeat no more.The addition sequence of each material is not particularly limited by the present invention, preferably adds successively in base oil
Enter extracting and cutting agent, emulsifying agent, alkalinity regulator, fluid loss additive and saline.In one embodiment of the present of invention
In, base oil is sequentially added into extracting and cutting agent, primary emulsion and auxiliary emulsifying agent, alkalinity regulator, filtrate reducing
Agent, saline and weighting material, obtain drilling fluid.
In the present invention, the mixing of each material is preferably carried out under conditions of stirring；The speed of described stirring
It is preferably 10000rpm～12000rpm, as stirred under the rotating speed of 11000rpm.The present invention can add every time
Stirring certain time when entering material, the time of stirring is preferably 5min～20min every time.Additionally, the present invention
The temperature of described mixing is not particularly limited.
In one embodiment of the invention, base oil adds extracting and cutting agent, at 10000rpm～12000rpm
Rotating speed under stir 5min～20min, be subsequently adding emulsifying agent, continue stirring 5min～20min, add alkali
Degree regulator, stirs 5min～20min, adds fluid loss additive, be stirred for 5min～20min, Ji Kepei
Prepare drilling fluid.
After obtaining without soil phase Water-In-Oil drilling fluid, the embodiment of the present invention uses Fann company 23D type emulsion-breaking voltage
Analyzer carries out electrical stability mensuration.Drilling fluid is loaded ageing can by the embodiment of the present invention, is placed in 80 DEG C～150
DEG C roller furnace in roll 16h, then in 60 DEG C measure described drilling fluids combination property, assay method is pressed
According to GB/T 16783.2-2012 " industrial gas oil drilling fluid on-the-spot test part 2: oil base drilling well
Liquid " carry out.
Measurement result shows, the oil-water ratio of the drilling fluid of Water-In-Oil without the soil phase that the present invention prepares can be at 7:3～9:1
Between adjustable, density can be at 0.9g/cm3～2.2g/cm3Between adjustable, have relatively in the range of 80 DEG C～150 DEG C
Good rheological property, suspension stability and Filtrate Loss Control ability, low cost and applied widely.
In order to be further appreciated by the present invention, the Water-In-Oil without the soil phase present invention provided below in conjunction with embodiment
Drilling fluid and preparation method thereof is specifically described.
In following example and comparative example, chain alkyl fatty acid amide and alkyl fatty acid amide are by China
Petroleum Group drilling fluid engineering and technological research institute provides；Calcium oxide is purchased from Tangyin County, Henan Province literary composition star building materials
Factory；Magnesium oxide is purchased from Hebei magnesium god science and technology chemical industry group company；Oxidized asphalt is by Xinxiang City, Henan Province
Seven Chemical Co., Ltd.s provide；Barite is carried by Yidu City, Hubei Province Hong Xin Mining Development Co., Ltd
Supply；Humic acid acetamide is provided by China Petroleum and Chemical Corporation Fushun Petrochemical Research Institute；Ferrum
Breeze is purchased from Kuche County of Xinjiang Ta Bei mud materials company limited.
Embodiment 1
Equipped with in the 5000mL mouth flask of thermometer, condensing tube and agitator, add 58.5g octylphenol polyethylene
Oxygen vinyl Ether, 39g sodium lauryl sulphate, 1950g distilled water and 5.25g azodiisobutyronitrile, at 40 DEG C
Under be stirred into aqueous phase；Weigh 263.8g styrene, 786.2g hexadecyl metrhacrylate and 8.4g to two
Vinyl benzene, is stirred into oil phase at 40 DEG C；
Being slowly added dropwise by described oil phase into water phase, 60min drips off, and stirs under 400rpm～600rpm rotating speed,
After emulsifying 2hr, obtain O/w emulsion；Described O/w emulsion is warming up to 70 DEG C, adds 1.77g over cure
Acid potassium, stops after reaction 8.5h, obtains extracting and cutting agent.Described extracting and cutting agent has a Formula II structure:
Formula II.
Utilize nanometer laser Particle Size Analyzer, products therefrom is carried out diameter characterization.Result sees Fig. 1, figure
1 is the nanometer laser grain size analysis figure of the embodiment of the present invention 1 gained extracting and cutting agent.Result shows, gained carries to be cut
The particle diameter of agent is 96nm.
Embodiment 2
At 210mL 0#Diesel oil adds the extracting and cutting agent that 6g embodiment 1 prepares, stirs under the rotating speed of 11000rpm
Mix 5min, add 9g chain alkyl fatty acid amide (C16～C20 alkyl) and 9g alkyl fatty acid amide
(C8～C10 alkyl), continues stirring 5min, adds 9g calcium oxide, stir 5min, adds 6g oxidation drip
Blue or green (softening point is 120 DEG C～160 DEG C), is stirred for 5min, adds 90mL and contains 20% calcium chloride water,
Stirring 20min, (density is 4.0g/cm to add 400g barite3, it is 2.5% that 75 μm tail over), stir 20min,
Obtain drilling fluid.
Embodiment 3
At 240mL 0#Diesel oil adds 9g Styrene-acrylic copolymer (Shanghai to haze Chemical Co., Ltd.,
SYNTRAN 3212), under the rotating speed of 11000rpm, stir 5min, add 7.5g chain alkyl fatty acid
Amide (C16～C20 alkyl) and 7.5g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min,
Add 7.5g magnesium oxide, stir 5min, add 9g humic acid acetamide, stir 5min, add 60mL and contain
20% calcium chloride water, stirs 20min, and (density is 5.15g/cm to add 338g Iron Ore Powder3, water solublity
Alkaline earth metal content is 80mg/kg), stir 20min, obtain drilling fluid.
Embodiment 4
At 210mL 0#Diesel oil adds 12g polyamide 6 50 (Yichuan brilliance Chemical Co., Ltd.),
Under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid amide (C16～C20 alkyl)
With 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min, add 9g calcium oxide, stirring
5min, adds 12g oxidized asphalt (with embodiment 2), stirs 5min, adds 30mL containing 20% chlorination
Calcium aqueous solution, stirs 20min, adds 340g mangano-manganic oxide, stirs 20min, obtains drilling fluid.
Embodiment 5
At 270mL 5#White oil adds 12g styrene-isoprene copolymer (the poly-holy scientific and technological limited public affairs in Shandong
Department, SIS1100), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid amide
(C16～C20 alkyl) and 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min, add
Enter 9g magnesium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min, add
Enter 30mL and contain 20% calcium chloride water, stir 20min, obtain drilling fluid.
Embodiment 6
At 210mL 5#(Ba Ling petrochemical industry has to add 12g hydrogenated styrene isoprene copolymer in white oil
Limit responsible company, SEBS), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fat
Acid amide (C16～C20 alkyl) and 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min,
Add 9g calcium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min,
Add 30mL and contain 20% calcium chloride water, stir 20min, add 150g barite (with embodiment 2),
Stirring 20min, obtains drilling fluid.
Embodiment 7
At 210mL 5#(Ba Ling petrochemical industry is limited to add 12g hydrogenated styrene-butadiene copolymer in white oil
Responsible company, SEPS), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid
Amide (C16～C20 alkyl) and 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min,
Add 9g magnesium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min,
Add 30mL and contain 20% calcium chloride water, stir 20min, add 254g barite (with embodiment 2),
Stirring 20min, obtains drilling fluid.
Embodiment 8
At 210mL 5#White oil adds 12g SB (the poly-holy scientific and technological limited public affairs in Shandong
Department, SBS4452), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid acyl
Amine (C16～C20 alkyl) and 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min,
Add 9g calcium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min,
Add 30mL and contain 20% calcium chloride water, stir 20min, add 518g barite (with embodiment 2),
Stirring 20min, obtains drilling fluid.
Embodiment 9
At 210mL 5#White oil adds 12g liquid polyisoprene (Puyang oilfield of Henan Lin Shi New Chemical Material stock
Part company limited), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid amide
(C16～C20 alkyl) and 9g alkyl fatty acid amide (with C8～C10 alkyl), continue stirring 5min,
Add 9g calcium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min,
Add 30mL and contain 20% calcium chloride water, stir 20min, add 900g barite (with embodiment 2),
Stirring 20min, obtains drilling fluid.
Embodiment 10
At 240mL 0#Diesel oil adds 9g polyamide 6 50 (with embodiment 4), at the rotating speed of 11000rpm
Lower stirring 5min, adds 7.5g chain alkyl fatty acid amide (C16～C20 alkyl) and 7.5g alkyl fatty
Acid amide (C8～C10 alkyl), continues stirring 5min, adds 7.5g calcium oxide, stir 5min, then add
Enter 9g oxidized asphalt (with embodiment 2), stir 5min, add 60mL and contain 20% calcium chloride water, stir
Mix 20min, add 400g barite (with embodiment 2), stir 20min, obtain drilling fluid.
Embodiment 11
At 240mL 0#Diesel oil adds 9g polyamide 6 50 (with embodiment 4), at the rotating speed of 11000rpm
Lower stirring 5min, adds 7.5g chain alkyl fatty acid amide (C16～C20 alkyl) and 7.5g alkyl fatty
Acid amide (C8～C10 alkyl), continues stirring 5min, adds 7.5g magnesium oxide, stir 5min, then add
Enter 9g oxidized asphalt (with embodiment 2), stir 5min, add 60mL and contain 20% calcium chloride water, stir
Mix 20min, add 400g barite (with embodiment 2), stir 20min, obtain drilling fluid.
Comparative example
At 240mL 0#In diesel oil add 9g organoclay (purchased from Zhejiang Fenghong New Material Co., Ltd.,
Model is HFGEL120), under the rotating speed of 11000rpm, stir 5min, add 9g chain alkyl fatty acid
Amide (C16～C20 alkyl) and 9g alkyl fatty acid amide (C8～C10 alkyl), continue stirring 5min,
Add 9g calcium oxide, stir 5min, add 12g oxidized asphalt (with embodiment 2), stir 5min,
Add 60mL and contain 20% calcium chloride water, stir 20min, add 400g barite (with embodiment 2),
Stirring 20min, obtains drilling fluid.
Embodiment 12
Method as described above, the drilling fluid of Water-In-Oil without the soil phase that embodiment 2～11 is prepared and ratio
The drilling fluid that relatively example is prepared carries out performance measurement.Wherein, the aging bar of rolling of comparative example and embodiment 2～9
Part is 150 DEG C/16h；The rolling aging condition of embodiment 10 is 80 DEG C/16h；The rolling of embodiment 11 is aging
Condition be followed successively by 100 DEG C/16h, 120 DEG C/16h, 140 DEG C/16h.Measurement result sees table 1, and table 1 is for implementing
Example 2～11 and the performance of drilling fluid prepared of comparative example.
Table 1 embodiment 2～11 and the performance of drilling fluid prepared of comparative example
Wherein, AV is apparent viscosity, and PV is plastic viscosity, and YP is yield value, and ES is emulsion-breaking voltage,
FL is filter loss.
As known from Table 1, compared with having soil phase Water-In-Oil drilling fluid, the Water-In-Oil without the soil phase that the application prepares
Drilling fluid has more preferable rheological characteristic, suspension stability and Filtrate Loss Control ability, and emulsion-breaking voltage is more than
850V.It addition, the drilling fluid cost of Water-In-Oil without the soil phase that the application provides is relatively low, beneficially popularization and application.
The above is only the preferred embodiment of the present invention, it is noted that general for the art
For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. without a soil phase Water-In-Oil drilling fluid, including following components in percentage by weight:
The base oil of 15%～75%；
The saline of 3%～33%；
The extracting and cutting agent of 0.8%～5%, described extracting and cutting agent selected from copolymer in cinnamic acrylic ester, styrene-
Acrylic copolymer, styrene-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers,
Liquid polyisoprene, ethylene-propylene copolymer or polyamide 6 50；
The emulsifying agent of 0.4%～6%；
The alkalinity regulator of 0.3%～3%；
0.5～the fluid loss additive of 3%；
0～the weighting material of 75%.
Drilling fluid the most according to claim 1, it is characterised in that the density of described drilling fluid is
0.9g/cm3～2.2g/cm3。
Drilling fluid the most according to claim 1, it is characterised in that described base oil is selected from 0#Diesel oil or
5#White oil.
Drilling fluid the most according to claim 1, it is characterised in that described saline is selected from calcium chloride water
One or more in solution, sodium-chloride water solution and potassium chloride solution.
Drilling fluid the most according to claim 1, it is characterised in that described alkalinity regulator is selected from oxygen
Change at least one in calcium and magnesium oxide.
Drilling fluid the most according to claim 1, it is characterised in that described weighting material is selected from weight crystalline substance
Stone, Iron Ore Powder or mangano-manganic oxide.
Drilling fluid the most according to claim 1, it is characterised in that described fluid loss additive is selected from oxidation
Colophonium or humic acid acetamide.
Drilling fluid the most according to claim 1, it is characterised in that described emulsifying agent includes main emulsifying
Agent and auxiliary emulsifying agent, described primary emulsion is selected from C12～22 alkyl fatty acid amide；
Described auxiliary emulsifying agent is selected from C8～14 alkyl fatty acid amide.
Drilling fluid the most according to claim 8, it is characterised in that described emulsifying agent includes 0.2%～3%
Primary emulsion and the auxiliary emulsifying agent of 0.2%～3%.
10., without a preparation method for soil phase Water-In-Oil drilling fluid, comprise the following steps:
By weight percentage, by 15%～75% the breast of the saline of base oil, 3%～33%, 0.4%～6%
The weighting material of the fluid loss additive of the alkalinity regulator of agent, 0.3%～3%, 0.5%～3%, 0～75% and
The extracting and cutting agent mixing of 0.8%～5%, obtains without soil phase Water-In-Oil drilling fluid；
Described extracting and cutting agent is selected from copolymer in cinnamic acrylic ester, Styrene-acrylic copolymer, styrene
-C4～6 diene copolymers, hydrogenated styrene-C4～6 diene copolymers, liquid polyisoprene, second
Alkene-propylene copolymer or polyamide 6 50.
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| CN113943562A (en) * | 2020-07-15 | 2022-01-18 | 中国石油天然气股份有限公司 | Workover fluid and preparation method thereof |
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