CN106318349A - High-density whole-oil-base drilling fluid - Google Patents
High-density whole-oil-base drilling fluid Download PDFInfo
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- CN106318349A CN106318349A CN201510397624.6A CN201510397624A CN106318349A CN 106318349 A CN106318349 A CN 106318349A CN 201510397624 A CN201510397624 A CN 201510397624A CN 106318349 A CN106318349 A CN 106318349A
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- 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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
Abstract
The invention provides a high-density whole-oil-base drilling fluid which comprises the following components in percentage by mass: 1-3% of oleophylic colloid, 2-4% of polyamide emulsifier, 0.5-1% of auxiliary emulsifier, 0.5-1% of wetting agent, 2-3% of acetamide N-alkyl humate, 2-4% of alkalinity regulator, 50-70% of weighting material and the balance of base oil. By using the polyamide emulsifier with cutting actions as the main emulsifier and the organic modified acetamide humate with low-viscosity effects as the fluid loss additive, compatibility research and formula optimization are performed to obtain the high-density whole-oil-base drilling fluid. The density of the high-density whole-oil-base drilling fluid is 1.6-2.2 g/cm<3>; and the high-density whole-oil-base drilling fluid has the advantages of favorable rheological property, favorable suspension stability, lower filter loss and favorable in-situ use effect.
Description
Technical field
The present invention relates to oil base drilling fluid technical field, particularly relate to a kind of full oil base drilling fluid of high density.
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.Oil base drilling fluid mainly with
Oil is continuous phase, and adds appropriate emulsifying agent, wetting agent, lipophile colloid, fluid loss additive and increase the weight of
The oil-based suspension of the formation such as agent or emulsion；The general water content oil base drilling fluid less than 5% is referred to as full oil
Base drilling fluid, and the referred to as water in oil emulsion drilling fluid that water content is more than 5%.Compare with water-base drilling fluid,
Oil base drilling fluid hinders anti-sticking and to formation damage degree in high temperature resistance, salt resistance, wellbore stability, fall
Etc. aspect there is certain advantage, be widely used as bore deep-well, ultradeep well, offshore drilling, High angle
Directional well, horizontal well and water sensitivity bad ground and the important means of reservoir protection.
Owing to exploring the complexity on stratum, when drilling some high pressure water-sensitive strata, and add the same of strong rejection capability
Time, in addition it is also necessary to higher mechanical property carrys out equilibrium strata pressure, keeps wellbore stability and safety drilling, because of
This is it is generally required to density is higher than 1.6g/cm3High density oil base drilling fluid.For the current full oil base of high density
Drilling fluid, for ensureing that under high temperature, weighting material does not settles, it will usually add too much organoclay or filtrate reducing
Agent such as oxidized asphalt, improves viscosity and shear force, but this plastic viscosity often leading to drilling fluid and shear force is anxious
Acute rising, makes the rheological characteristic of drilling fluid be difficult to control to, and particularly under low temperature, drilling fluid can be thickened, and is unfavorable for
Turn on pump circulates, and pump pressure raises, and easily causes complex accident.And if fluid loss additive and the dosage of organoclay
Too low, the filter loss of drilling fluid is just difficult to control to, and high temperature and high pre ssure filtration can be caused to increase.
Therefore, the difficult point of the full oil base drilling fluid of high density is the unification how taking into account rheological characteristic with filter loss,
Make drilling fluid both have good rheological characteristic, there is again relatively low filter loss, to meet the need of site operation
Want.
Summary of the invention
In view of this, the purpose of the application is to provide a kind of full oil base drilling fluid of high density, and the application carries
The drilling fluid of confession has good rheological characteristic and relatively low filter loss.
The present invention provides a kind of full oil base drilling fluid of high density, including the component of following mass percent:
The oleophylic colloid of 1%～3%；
The primary emulsion of 2%～4%, described primary emulsion is polyamide-based emulsifying agent；
The auxiliary emulsifying agent of 0.5%～1%；
The wetting agent of 0.5%～1%；
The fluid loss additive of 2%～3%, described fluid loss additive is N-alkyl humic acid acetamide；
The alkalinity regulator of 2%～4%；
The weighting material of 50%～70%；
Surplus is base oil.
Preferably, described primary emulsion has a Formulas I structure:
R1(CONH)n(CH2)mCH2R2Formulas I；
In Formulas I, R1And R2Alkyl or the thiazolinyl of C12～C20 independently selected from C12～C20；
N is selected from the integer between 1～3；
M is selected from the integer between 2～4.
Preferably, described fluid loss additive has a Formula II structure:
R3(NHCO)x Ha(CONH)yR4Formula II；
In Formula II, Ha is humic acid residue；
R3And R4Alkyl or the thiazolinyl of C12～C20 independently selected from C12～C20；
X and y is independently selected from the integer between 1～3.
Preferably, described oleophylic colloid is selected from the quaternary ammonium salt-modified organoclay of montmorillonite.
Preferably, at least one in dodecylbenzene sodium sulfonate and OP-10 of described auxiliary emulsifying agent.
Preferably, described wetting agent is selected from zwitterionic surfactant.
Preferably, at least one in calcium oxide and magnesium oxide of described alkalinity regulator.
Preferably, described weighting material one or many in barite, Iron Ore Powder and mangano-manganic oxide
Kind.
Preferably, described base oil is selected from mineral white oil or diesel oil.
Preferably, the density of the full oil base drilling fluid of described high density is 1.6g/cm3～2.2g/cm3。
Compared with prior art, the drilling fluid that the present invention provides includes by percentage to the quality: 1%～3%
Oleophylic colloid；The polyamide-based emulsifying agent of 2%～4%；The auxiliary emulsifying agent of 0.5%～1%；The profit of 0.5%～1%
Humectant；The fluid loss additive of 2%～3%, described fluid loss additive is N-alkyl humic acid acetamide；The alkali of 2%～4%
Degree regulator；The weighting material of 50%～70%；Surplus is base oil.The present invention mainly uses to have to carry and cuts work
Polyamide-based emulsifying agent be primary emulsion, to have the organically-modified humic acid acetamide of low viscosity effect
As fluid loss additive, by Study on compatibility and formulation optimization, obtain joining of the full oil base drilling fluid of high density
Side.The density range of the full oil base drilling fluid of high density of the present invention can be at 1.6g/cm3～2.2g/cm3Between, tool
Having good rheological characteristic, suspension stability and relatively low filter loss, using effect is good at the scene.
Detailed description of the invention
Below the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that retouched
The embodiment stated is only a part of embodiment of the present invention rather than whole embodiments.Based on the present invention
In embodiment, the institute that those of ordinary skill in the art are obtained under not making creative work premise
There are other embodiments, broadly fall into the scope of protection of the invention.
The invention provides a kind of full oil base drilling fluid of high density, including the component of following mass percent:
The oleophylic colloid of 1%～3%；
The primary emulsion of 2%～4%, described primary emulsion is polyamide-based emulsifying agent；
The auxiliary emulsifying agent of 0.5%～1%；
The wetting agent of 0.5%～1%；
The fluid loss additive of 2%～3%, described fluid loss additive is N-alkyl humic acid acetamide；
The alkalinity regulator of 2%～4%；
The weighting material of 50%～70%；
Surplus is base oil.
The present invention uses to have and carries viscous primary emulsion and the fluid loss additive of low viscosity effect cutting effect, reduces
The consumption of oleophylic colloid, have developed the full oil base drilling fluid of high density that a kind of low viscous height is cut, suspending stabilized
On the premise of property is guaranteed, it has good rheological and relatively low filtration loss.
By percentage to the quality, the drilling fluid that the present invention provides includes the base of a certain amount of inorganic agent and surplus
Oil, for full oil base drilling fluid.In an embodiment of the present invention, described base oil is selected from mineral white oil or diesel oil,
Applied widely.The source of described base oil is not particularly limited by the present invention, and described base oil preferably is selected from 0#Bavin
Oil, 3#Mineral white oil or 5#Mineral white oil.
By percentage to the quality, described drilling fluid includes the oleophylic colloid of 1%～3%, preferably includes
The oleophylic colloid of 1.5%～2.5%, it is ensured that drilling fluid has certain shear force.In the present invention, described oleophylic
Colloid is preferably the quaternary ammonium salt-modified organoclay of montmorillonite.The present invention does not has spy to the source of described oleophylic colloid
Different restriction, can commercially obtain.
By percentage to the quality, described drilling fluid includes the alkalinity regulator of 2%～4%, preferably includes
The alkalinity regulator of 2.5%～3.5%.Described alkalinity regulator preferably is selected from least in calcium oxide and magnesium oxide
Kind, more preferably calcium oxide (popular name quick lime).
By percentage to the quality, described drilling fluid includes the primary emulsion of 2%～4%, preferably includes
The primary emulsion of 2.5%～3.5%.In the present invention, described primary emulsion is polyamide-based emulsifying agent, plays
Main emulsification, has simultaneously and certain proposes the effect of cutting.Described primary emulsion preferably has a Formulas I structure:
R1(CONH)n(CH2)mCH2R2Formulas I；
In Formulas I, R1And R2Independently selected from alkyl or the thiazolinyl of C12～C20 of C12～C20, independent
Preferably be selected from the alkyl of C15～C18 or the thiazolinyl of C15～C18, the most more preferably C16～C18
Thiazolinyl.In the present invention, R1And R2It is preferably all straight-chain alkyl.In Formulas I, n is selected between 1～3
Integer；M is selected from the integer between 2～4.In the present invention, Formulas I is the structural representation formula of primary emulsion,
The most described primary emulsion has amide structure and alkyl long-chain.In one embodiment of the invention,
Described primary emulsion has Formulas I-1 structure:
C16H31(CONH)2(CH2)3CH2C18H35Formulas I-1.
The polyamide-based emulsifying agent main chain that the present invention has Formulas I structure is long, and adsorption group is many, it is possible to effectively carry
The structural capacity of high full oil base drilling fluid, reduces the dosage of organoclay.It addition, this emulsifier molecules has
Multiple amide groups, enhance molecular rigidity, can improve the temperature resistance ability of drilling fluid, thus ensure its high temperature
Under suspension stability.
The source of the present invention polyamide-based emulsifying agent to having Formulas I structure is not particularly limited, preferably according to
Following methods prepares: organic acid and organic amine are carried out amidation process and condensation reaction, obtains having Formulas I
The polyamide-based emulsifying agent of structure；Described organic acid is selected from natural acid such as oleic acid, and described organic amine selects
It is 12～25, preferably 15 from carbon number～22, more preferably 16～the fatty amine of 20, can be monoamine, binary
Amine or polyamine.
Said method can add four by organic acid and organic amine according to certain ratio under conditions of stirring
Angle reaction bulb, carries out amidation process and condensation reaction, obtains primary emulsion.
In one embodiment of the invention, described organic acid is 2:1 with the mol ratio of organic amine.Described acyl
The temperature of aminating reaction is preferably 140 DEG C～160 DEG C；The time of described amidation process and condensation reaction is preferred
For 4h～6h.After reaction terminates, the embodiment of the present invention can carry out taking out washing with ethanol, obtains in viscous liquid
Primary emulsion.In an embodiment of the present invention, described primary emulsion kinematic viscosity at room temperature is less than
40m2/s。
By percentage to the quality, the drilling fluid that the present invention provides includes the auxiliary emulsifying agent of 0.5%～1%, preferably
Including the auxiliary emulsifying agent of 0.6%～0.8%.In the present invention, described auxiliary emulsifying agent preferably is selected from detergent alkylate
At least one in sodium sulfonate and OP-10, not only co-emulsifier is made good use of, and cost performance is high, and thing is beautiful
Inexpensive.
By percentage to the quality, described drilling fluid includes the fluid loss additive of 2%～3%, preferably includes
The fluid loss additive of 2.2%～2.8%.In the present invention, described fluid loss additive is N-alkyl humic acid acetamide,
Belong to organically-modified humic acid acetamide, there is low viscosity effect.Described fluid loss additive preferably has Formula II knot
Structure:
R3(NHCO)x Ha(CONH)yR4Formula II；
In Formula II, Ha is humic acid residue；The complicated structure of humic acid, containing multiple carboxyls and hydroxyl
Base, in Formula II of the present invention, Ha represents the humic acid residue after part carboxyl carries out amidation process.Formula II
In, R3And R4Independently selected from alkyl or the thiazolinyl of C12～C20 of C12～C20, it preferably is selected from independently
The alkyl of C15～C18 or the alkyl of the thiazolinyl of C15～C18, the most more preferably C16～C18.At this
In invention, R3And R4It is preferably all straight-chain alkyl.In Formula II, x and y is independently selected between 1～3
Integer.In the present invention, Formula II is the structural representation formula of fluid loss additive, and the most described fluid loss additive has corruption
Grow acid residue, amide groups and alkyl long-chain.
The present invention has the fluid loss additive of Formula II structure good dispersion in oil phase, can improve drilling fluid viscosity,
Reduce filter loss, the viscous shear force under high density drilling fluid low temperature can be reduced simultaneously, improve rheological characteristic, thus
The compatibility effect of other inorganic agent collaborative, makes high density oil base drilling fluid have good rheological characteristic, suspension
Stability and relatively low filter loss.
The source of the present invention fluid loss additive to having Formula II structure is not particularly limited, preferably according to following
Method prepares: by humic acid and organic amine and cross-linking agent mixing, carries out amidation process, obtains having formula
The fluid loss additive of II structure；Described organic amine, selected from the fatty amine that carbon number is 12～20, can be monoamine
Or diamine etc.；Described cross-linking agent is selected from the polyhydric aliphatic amine that carbon number is 12～20.
Humic acid and organic amine can first be mixed by said method according to certain ratio, load after mix homogeneously
Corner reaction bulb, is subsequently adding cross-linking agent and carries out amidation process, obtain humic acid acetamide fluid loss additive.
In one embodiment of the invention, the mol ratio of described humic acid and organic amine is 1:3.The present invention
Embodiment is preferably warming up to when 100 DEG C add cross-linking agent；The consumption of described cross-linking agent preferably humic acid and having
The 0.5% of machine amine gross mass.The temperature of described amidation process is preferably 140 DEG C～160 DEG C；Described amide
The time changing reaction is preferably 6h～8h.After reaction terminates, product is dried by the embodiment of the present invention, powder
The humic acid fluid loss additive of modification is obtained after broken.In an embodiment of the present invention, the 80 of described fluid loss additive
Mesh sieve margin is less than 5%.
Except the inorganic agent such as mentioned emulsifier and fluid loss additive, by percentage to the quality, the present invention provides
Drilling fluid includes the wetting agent of 0.5%～1%, preferably includes the wetting agent of 0.6%～0.8%.The present invention is to institute
The source stating wetting agent is not particularly limited, and uses corresponding commercially available prod.In the present invention, institute
State wetting agent and be preferably zwitterionic surfactant, more preferably there is formula III structure:
R5N+(CH3)2(CH2)t(OH)R6SO3 -Formula III；
In formula III, R5And R6Independently selected from alkyl or the thiazolinyl of C10～C16 of C10～C16, independent
Preferably be selected from the alkyl of C12～C15 or the thiazolinyl of C12～C15, the most more preferably C12～C14
Thiazolinyl；T is selected from the integer between 1～3.In one embodiment of the invention, described wetting agent has formula
III-1 structure:
C14H27N+(CH3)2(CH2)3(OH)C12H23SO3 -Formula III-1.
By percentage to the quality, the drilling fluid that the present invention provides includes the weighting material of 50%～70%, preferably
Including the weighting material of 55%～65%, it is beneficial to adjust the density etc. of drilling fluid, to meet dissimilar well
Probing needs.In the present invention, described weighting material preferably is selected from barite, Iron Ore Powder and mangano-manganic oxide
In one or more, more preferably at least one in barite and Iron Ore Powder.Described weighting material can
Use commercially available prod, as density can be used to be 4.0g/cm3Barite product.At embodiments of the invention
In, the density of described drilling fluid can be 1.6g/cm3～2.2g/cm3。
The composition of the full oil base drilling fluid of high density that the embodiment of the present invention is provided is mainly: base oil, oleophylic
Colloid, fluid loss additive, primary emulsion, auxiliary emulsifying agent, wetting agent, weighting material and alkalinity regulator,
Its density is adjustable, has good rheological property, suspension stability and relatively low in certain temperature range
Filter loss, using effect is good at the scene.
Accordingly, present invention also offers the preparation method of the full oil base drilling fluid of a kind of high density, including with
Lower step:
By percentage to the quality, by 1%～3% the primary emulsion of oleophylic colloid, 2%～4%, 0.5%～1%
The alkalinity regulator of the wetting agent of auxiliary emulsifying agent, 0.5%～1%, 2%～4%, 2%～3% fluid loss additive,
The weighting material of 50%～70% and the mixing of surplus base oil, obtain the full oil base drilling fluid of high density through aging；Institute
Stating primary emulsion is polyamide-based emulsifying agent, and described fluid loss additive is N-alkyl humic acid acetamide.
The embodiment of the present invention adds the oleophylic colloid of above mass percent, primary emulsion, auxiliary in base oil
Emulsifying agent, wetting agent, fluid loss additive and alkalinity regulator, be eventually adding weighting material, and stirring makes mixing
Uniformly, carry out aging in loading ageing can, obtain the full oil base drilling fluid of high density.Wherein, difference is added
The weighting material of quality, can obtain density is 1.6g/cm3Or 2.2g/cm3Full oil base drilling fluid.
In the present invention, described base oil is consistent with content mentioned above with inorganic agents such as fluid loss additives,
This repeats no more.The addition sequence of each material is not particularly limited by the present invention, preferably in base oil successively
Add oleophylic colloid, primary emulsion, auxiliary emulsifying agent, wetting agent, fluid loss additive, alkalinity regulator and add
Heavy material.In one embodiment of the invention, under agitation, base oil adds oleophylic colloid,
After stirring certain time, sequentially add primary emulsion, auxiliary emulsifying agent and wetting agent, stir certain time,
Sequentially add fluid loss additive and alkalinity regulator, add weighting material after stirring, be stirred for carrying out aging
Obtain.
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 10000 revs/min～12000 revs/min, as stirred under the high speed of 10000 revs/min.The present invention can be often
Stirring certain time during secondary addition material, the time of stirring is preferably 5min～20min every time.Additionally, this
Invent the temperature to described mixing to be not particularly limited.In a preferred embodiment of the invention, described aging
Temperature be 150 DEG C, aging heat rolling 16h.
After obtaining the full oil base drilling fluid of high density, the present invention measures the combination property of described drilling fluid in 60 DEG C,
Assay method is according to GB/T 16783.2-2012 " industrial gas oil drilling fluid on-the-spot test the 2nd
Point: oil base drilling fluid " carry out.
Measurement result shows, the full oil base drilling fluid density that the present invention prepares can be at 1.6g/cm3～2.2g/cm3
Between adjustable, under 150 DEG C of high temperature, apparent viscosity be less than 90mPa s, filter loss be less than 1.0mL, on
Lower density difference is less than 0.01g/cm3, show that it has preferable rheological characteristic, suspension stability and relatively low filter
Vector, it is possible to meet exploration and development needs.
In practice, on-the-spot drilling fluid preparation procedure comprises the steps that
(1) with the clean blood circulation of clean water and water-line；
(2) in preparing tank, required base oil is put into；
(3) pressing formula ratio and add base oil in tank, start ground circulation, blended funnel is sequentially added into institute
Need oleophylic colloid, primary emulsion, auxiliary emulsifying agent, wetting agent, fluid loss additive, alkalinity regulator, fully
Circulation stirring 1.5h～2h is to the most dispersed；
(4) according to design requirement, the drilling fluid density that weighting material reaches required is added.
Complete for high density of the present invention oil base drilling fluid is defended in Zhongyuan Oil Field 68-FP1 well, defend 383-FP2 well and
Well scene, Pu deep 18-side 1 is applied, and stabilizing mud properties in application, maintenance period is long, and rheological characteristic is prone to
Controlling, suspension stability is good.
In order to be further appreciated by the present invention, the full oil base of the high density present invention provided below in conjunction with embodiment
Drilling fluid is specifically described.
In following example, humic acid is purchased from Lingshi County, Shanxi Province vast stretch of wooded country humic acid plant；Montmorillonite quaternary ammonium salt
Modified organoclay is purchased from Zhejiang Fenghong New Material Co., Ltd.；Wetting agent is rich purchased from Xinxiang City, Henan Province
Science and Technology Ltd. of nation；Barite is 4.0g/cm purchased from Yichang Heng great Chemical Co., Ltd., density3。
Embodiment 1
It is 2:1 according to the mol ratio of organic acid Yu organic amine, oleic acid, carbon 15 fatty acid and cetylamine are existed
Add corner reaction bulb under stirring condition, at a temperature of 150 DEG C, react 4h, then carry out taking out washing with ethanol,
Obtain viscous liquid i.e. primary emulsion.
Described primary emulsion has Formulas I-1 structure:
C16H31(CONH)2(CH2)3CH2C18H35Formulas I-1.
Embodiment 2
It is 1:3 according to mol ratio, by humic acid and 18-amine. mix homogeneously, loads corner reaction bulb, first rise
Temperature, to 100 DEG C, is subsequently adding 0.5% cross-linking agent diethyl triamine, is brought rapidly up to 150 DEG C reacting,
After reaction 6h, products therefrom is dried, is grinding to obtain humic acid acetamide fluid loss additive.
Described fluid loss additive has Formula II structure, wherein, R3And R4Being the straight chained alkyl of C18, x and y divides
It is not 2 and 3.
Embodiment 3
Take 355mL 5#Mineral white oil, under the mixing speed of 10000 revs/min, adds 20g montmorillonite season
Ammonium salt modification organoclay, after high-speed stirred 5min, sequentially adds the main emulsifying that 18g embodiment 1 prepares
Agent, 7g dodecylbenzene sodium sulfonate, 7g wetting agent, high-speed stirred 5min, sequentially add 20g and implement
The prepared humic acid acetamide of example 2,30g quick lime, high-speed stirred 5min, it is eventually adding 400g barite
High-speed stirred 5min, rolls 16h through 150 DEG C of heat in loading ageing can, and obtaining density is 1.6g/cm3Full oil
Base drilling fluid.
Embodiment 4
According to the method for embodiment 3, differing only in, be eventually adding 970g barite, obtaining density is
2.2g/cm3Full oil base drilling fluid.
Embodiment 5
Take 300mL 3#Mineral white oil, under the mixing speed of 10000 revs/min, adds 12g montmorillonite season
Ammonium salt modification organoclay, after high-speed stirred 5min, sequentially adds the main emulsifying that 18g embodiment 1 prepares
Agent, 12g OP-10,12g wetting agent, high-speed stirred 5min, sequentially add 24g embodiment 2 and prepare
Humic acid acetamide, 24g quick lime, high-speed stirred 5min, be eventually adding 380g barite high-speed stirred
5min, rolls 16h through 150 DEG C of heat in loading ageing can, and obtaining density is 1.6g/cm3Full oil base drilling fluid.
Embodiment 6
According to the method for embodiment 5, differing only in, be eventually adding 850g barite, obtaining density is
2.2g/cm3Full oil base drilling fluid.
Embodiment 7
Take 350mL 5#Mineral white oil, under the mixing speed of 10000 revs/min, adds 12g montmorillonite season
Ammonium salt modification organoclay, after high-speed stirred 5min, sequentially adds the main emulsifying that 26g embodiment 1 prepares
Agent, 7g dodecylbenzene sodium sulfonate, 11g wetting agent, high-speed stirred 5min, sequentially add 12g real
Execute humic acid acetamide, 23g quick lime that example 2 prepares, high-speed stirred 5min, be eventually adding 410g weight crystalline substance
Stone high-speed stirred 5min, rolls 16h through 150 DEG C of heat in loading ageing can, and obtaining density is 1.6g/cm3Complete
Oil base drilling fluid.
Embodiment 8
According to the method for embodiment 7, differing only in, be eventually adding 900g barite, obtaining density is
2.2g/cm3Full oil base drilling fluid.
Embodiment 9～16
The formula of the drilling fluid that table 1 provides for the embodiment of the present invention 9～16, according to the formula of table 1,150
DEG C heat rolling 16h, respectively obtain full oil base drilling fluid.
The formula (amounts of components is by percentage to the quality) of the drilling fluid that table 1 embodiment of the present invention 9～16 provides
In table 1, primary emulsion is the polyamide-based emulsifying agent that embodiment 1 prepares；
Amphion sulfonic acid has formula III-1 structure, for wetting agent；
Modified organoclay is the quaternary ammonium salt-modified organoclay of montmorillonite.
Embodiment 17
Method as described above, the full oil base drilling fluid being prepared embodiment 3～16 carries out performance survey
Fixed, result sees table 2 and table 3, and table 2 is the property of drilling fluid of embodiment 3～8, and table 3 is embodiment 9～16
Property of drilling fluid.
The property of drilling fluid of table 2 embodiment 3～8
The property of drilling fluid of table 3 embodiment 9～16
Note: in table 2 and table 3, ρ is drilling fluid density；AV is apparent viscosity；PV is plastic viscosity；YP cuts for dynamic
Power；Gel is first, egress.△ ρ is difference of densities (takes the drilling fluid after high temperature, then 150 DEG C stand measurement after 72h).
From table 2 and table 3, the drilling fluid that the embodiment of the present invention provides in 150 DEG C of high temperature, density is
1.6g/cm3～2.2g/cm3In the range of, apparent viscosity is less than 90mPa s, and filter loss is less than 1.0mL, on
Lower density difference is less than 0.01g/cm3, showing that it has good rheological characteristic and suspension stability, filter loss is low,
Disclosure satisfy that exploration and development needs.
Embodiment 18
On-the-spot drilling fluid preparation procedure includes:
(1) with the clean blood circulation of clean water and water-line；
(2) in preparing tank, required base oil is put into；
(3) by the formula of following mass percent: modified organoclay+3% embodiment 1 of base oil+1.0% is made
The humic acid acetamide of standby primary emulsion+0.5% auxiliary emulsifying agent+0.5% wetting agent+2.5% embodiment 2 preparation
+ 3% calcium oxide+barite (according to density needs, select barite dosage), adds base oil in tank,
Start ground circulation, blended funnel be sequentially added into required modified organoclay, primary emulsion, auxiliary emulsifying agent,
Wetting agent, fluid loss additive, calcium lime powder, abundant circulation stirring 1.5h～2h is to the most dispersed；
(4) according to design requirement, the drilling fluid density that weighting material reaches required is added.
Complete for high density of the present invention oil base drilling fluid is defended in Zhongyuan Oil Field 68-FP1 well, defend 383-FP2 well and
Well scene, Pu deep 18-side 1 is applied, and different well example performances see table 4, and table 4 is that the embodiment of the present invention is highly dense
Spend performance in the application of full oil base drilling fluid scene.As shown in Table 4, in present invention application, property of drilling fluid is steady
Fixed, maintenance period is long, and rheological characteristic is easily controllable, and suspension stability is good.
Performance in the application of table 4 embodiment of the present invention high density full oil base drilling fluid scene
Note: drilling fluid rheology measures under the conditions of 60 DEG C.
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. the full oil base drilling fluid of high density, including the component of following mass percent:
The oleophylic colloid of 1%～3%；
The primary emulsion of 2%～4%, described primary emulsion is polyamide-based emulsifying agent；
The auxiliary emulsifying agent of 0.5%～1%；
The wetting agent of 0.5%～1%；
The fluid loss additive of 2%～3%, described fluid loss additive is N-alkyl humic acid acetamide；
The alkalinity regulator of 2%～4%；
The weighting material of 50%～70%；
Surplus is base oil.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described main breast
Agent has a Formulas I structure:
R1(CONH)n(CH2)mCH2R2Formulas I；
In Formulas I, R1And R2Alkyl or the thiazolinyl of C12～C20 independently selected from C12～C20；
N is selected from the integer between 1～3；
M is selected from the integer between 2～4.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described fall is filtered
Lose agent and there is Formula II structure:
R3(NHCO)xHa(CONH)yR4Formula II；
In Formula II, Ha is humic acid residue；
R3And R4Alkyl or the thiazolinyl of C12～C20 independently selected from C12～C20；
X and y is independently selected from the integer between 1～3.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described oleophylic
Colloid is selected from the quaternary ammonium salt-modified organoclay of montmorillonite.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described auxiliary breast
At least one in dodecylbenzene sodium sulfonate and OP-10 of agent.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described moistening
Agent is selected from zwitterionic surfactant.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described basicity
At least one in calcium oxide and magnesium oxide of regulator.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described in increase the weight of
One or more in barite, Iron Ore Powder and mangano-manganic oxide of material.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described base oil
Selected from mineral white oil or diesel oil.
The full oil base drilling fluid of high density the most according to claim 1, it is characterised in that described height
The density of the full oil base drilling fluid of density is 1.6g/cm3～2.2g/cm3。
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| CN201510397624.6A CN106318349A (en) | 2015-07-08 | 2015-07-08 | High-density whole-oil-base drilling fluid |
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| CN201510397624.6A CN106318349A (en) | 2015-07-08 | 2015-07-08 | High-density whole-oil-base drilling fluid |
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| CN101215461A (en) * | 2008-01-04 | 2008-07-09 | 中国海洋石油总公司 | Complete-oil synthetic base drilling fluid |
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| CN104497999A (en) * | 2014-12-31 | 2015-04-08 | 中国石油天然气集团公司 | Plant oil-based drilling fluid and preparation method thereof |
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