CN104559955A - Asphalt composition used for drilling fluid and preparation method thereof - Google Patents
Asphalt composition used for drilling fluid and preparation method thereof Download PDFInfo
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- CN104559955A CN104559955A CN201310496045.8A CN201310496045A CN104559955A CN 104559955 A CN104559955 A CN 104559955A CN 201310496045 A CN201310496045 A CN 201310496045A CN 104559955 A CN104559955 A CN 104559955A
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- asphalt
- bituminous composition
- softening point
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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
- C09K8/035—Organic additives
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- General Life Sciences & Earth Sciences (AREA)
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- Working-Up Tar And Pitch (AREA)
Abstract
The invention discloses an asphalt composition used for a drilling fluid and a preparation method thereof. The asphalt composition takes high softening point asphalt as the nucleation phase, and high softening point asphalt is covered with high-softening-point coal asphalt. The asphalt composition comprises the following components in percentage by mass: 20-50% of high-softening-point asphalt and 50-80% of high-softening-point coal asphalt, wherein the softening point difference of high softening point asphalt and high softening point coal asphalt is 15-40 DEG C. The preparation method comprises the following steps: adding molten coal asphalt into an oxidation reactor; introducing air for performing air blowing oxidation reaction; after the reaction is ended, spraying the oxidized material on the surface of high-softening-point asphalt powder for covering; cooling to obtain the asphalt composition; adding the asphalt composition into a smashing device for mixing and smashing to prepare asphalt composition particles. The asphalt composition has a relatively high softening point, and can continuously play a role under the drilling operation conditions within a relatively wide temperature range.
Description
Technical field
The invention belongs to petroleum drilling technology field, be specifically related to a kind of bituminous composition for drilling fluid and preparation method thereof.
Background technology
Asphalt product is one of important additive for drilling fluid, has good anti-collapse, lubrication, emulsification, the comprehensive effectiveness such as filtrate reducing and high-temperature stable.Asphalt product generally containing water-fast pitch particle, and has certain softening temperature.When there being sufficiently high temperature and pressure in well, pitch particle softening transform, and be squeezed in borehole wall microfracture, stops drilling fluid and filtrate to be permeated from microfracture, shutoff stratum effectively together with mud cake.Bitumen is the extremely effective anti-sloughing agent of petroleum drilling and oil layer protective agent.Along with the development of Petroleum finance, drilling depth is constantly deepened, and drilling strata is more and more complicated, and the quantity of the special well such as orientation well, horizontal well increases gradually.This makes drilling engineering have higher requirement to drilling fluid asphalt product and system thereof.Develop high-temperature behavior good, have the high softening point bitumen of good seal-off effect and filtration reduction (referring to that softening temperature is more than 100 DEG C, especially more than 120 DEG C), to meet the needs of oil drilling engineering, tool is of great significance.
The preparation technology of high softening point bitumen generally adopts solvent deasphalting or air blowing oxidation technique, CN102464989A, CN102876344A, CN102464988A and CN102382696A etc. disclose several preparation method for the high softening point bitumen in drilling fluid or pitch particle, pitch softening point, generally more than 120 DEG C, is up to 250 DEG C.
CN102952526A discloses a kind of high softening-point emulsified bitumen water-base drilling fluid treatment agent and preparation method thereof, described additive for drilling fluid comprises pitch, 35 ~ 50 % by weight water that 40 ~ 70% softening temperatures are 150 ~ 240 DEG C, 0.02 ~ 2% auxiliary agent, 0.05 ~ 5 % emulsifying agent, 0.01 ~ 1% stablizer, this additive for drilling fluid has good High Temperature High Pressure filtrate reducing function, is applicable to deep-well and the ultra-deep well drilling of High Temperature High Pressure.
US7220348B1, CN102876344 A, CN102876344 A and CN102732280A also discloses the production method of several high softening point bitumen, asphaltic products. softening temperature all 250 DEG C with, but mainly for the production of carbon fiber product, fire bond and spinning field.
Existing high softening point bitumen is when being applied in the middle of drilling fluid system, single owing to forming, and there is viscoelastic scope less, and the problems such as use temperature scope is narrower, are difficult to continue to play a role in down-hole.CN1046176A discloses a kind of containing about 2 parts of high softening-point gilsonite of pre-mixing, the water-based drilling muds additive of about 1 portion of low softening point gilsonite, about 1 part of causticization brown coal and a kind of strongly lipophilic nonionogenic tenside.This compositions of additives can be effective in the temperature and pressure of wide region, but simple mechanically mixing is difficult to the action effect effectively playing different softening point pitch.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of bituminous composition for drilling fluid and preparation method thereof.Bituminous composition of the present invention has higher softening temperature, can continue to play a role under the drilling operation condition of wide temperature range.
The present invention is used for the bituminous composition of drilling fluid, take high softening point bitumen as nuclear phase, outer layer covers high softening-point coal-tar pitch, and this bituminous composition by mass percentage, comprises following component: high softening point bitumen 20% ~ 50%, high softening-point coal-tar pitch 50% ~ 80%; Wherein the softening point difference of high softening point bitumen and high softening-point coal-tar pitch is 15 ~ 40 DEG C.
Bituminous composition of the present invention can also need to add one or more in the additives such as water soluble fibre, sulfonated lignite, sulfonated phenol formaldehyde resin, sodium lauryl sulphate, Dodecyl trimethyl ammonium chloride, palmityl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, water soluble resin, polyvinylpyrrolidone (PVP), graphite, polynite, wilkinite according to actual product, and each component sum of 5% ~ 20%(bituminous composition that additive add-on accounts for bituminous composition gross weight is 100%); Wherein water soluble fibre is one or more in carboxymethyl cellulose (CMC), polyvinyl alcohol fiber, WATER-SOLUBLE PVA FIBER; Sulfonated lignite and sulfonated phenol formaldehyde resin can use commercial goods, also can prepare by this area ordinary method; Water soluble resin is one or more in water soluble acrylic resin, water soluble alkyd resin, Polyester Resin Water Soluble; Graphite, polynite, wilkinite are solid powdery.
In bituminous composition of the present invention, the softening temperature of described high softening point bitumen is 140 ~ 260 DEG C, is preferably 150 ~ 240 DEG C; High softening point bitumen is solid, powdery, median size≤100 μm, preferred median size≤60 μm.
In bituminous composition of the present invention, described high softening point bitumen can adopt commercially available prod, also can prepare according to this area routine techniques, as reduced pressure distillation process, solvent de-asphalting process, air blowing oxidation technique etc., or the combination of several technique.
In bituminous composition of the present invention, the softening temperature of described high softening-point coal-tar pitch is 100 ~ 180 DEG C, preferably 120 ~ 150 DEG C.
The present invention is used for the preparation method of the bituminous composition of drilling fluid, comprise following content: join in oxidation reactor by the coal-tar pitch of melting, pass into air and carry out air blowing oxidation reaction, after reaction terminates, oxidation material is sprayed onto high softening point bitumen powder surface and forms parcel, cooling obtains bituminous composition, is joined by bituminous composition in disintegrating apparatus and carries out co-grinding, namely prepare Asphalt composition particle.
In the inventive method, high softening point bitumen powder is preferably dry mixed with solid dispersion, and wherein the mass ratio of asphalt powder and dispersion agent is 10:1 ~ 20:1, and described solid dispersion is one or more in graphite, polynite, wilkinite or hydrotalcite.
In the inventive method, described oxidation reactor is batch oxidation still or continous way oxidizing tower.Oxidation reaction condition is: gas flow is 0.05 ~ 1m
3kg
-1h
-1, preferably 0.1 ~ 0.8m
3kg
-1h
-1, more preferably 0.4 ~ 0.6 m
3kg
-1h
-1.Oxidizing temperature is 220 ~ 300 DEG C, and be preferably 240 ~ 280 DEG C, oxidization time is 5 ~ 20 hours, preferably 8 ~ 15 hours.
In the inventive method, preferably in air blowing process, add promotor, promotor is one or more in hydrogen peroxide, Potcrate, potassium permanganate or iron(ic) chloride, and promotor add-on is the 0.1wt% ~ 1.0wt% accounting for coal-tar pitch quality.
In the inventive method, described coal-tar pitch is the coal-tar pitch after middle temperature or pyrogenic distillation, and softening temperature is 50 ~ 95 DEG C.
In the inventive method, described sprinkling process can adopt the spray appliance being connected with atomizing nozzle with certain pressure, and pressure and jet size adjust according to practical situation, guarantees oxidation material to spray.
In the inventive method, described disintegrating apparatus can be that high energy shear milling machine, colloidal mill, ball mill pulverizer etc. stir or hit stirring-type disintegrating apparatus, grinding time is 10 ~ 60s, pulverize temperature for being not more than 20 DEG C, bituminous composition preferably carries out low temperature brittleness process before pulverizing, and low temperature brittleness treatment condition are: temperature is 0 ~-60 DEG C, is preferably-10 ~-30 DEG C, time is 2 ~ 48 hours, is preferably 2 ~ 10 hours.
Preferably add coating agent in described preparation process and/or solid dispersion mixes with bituminous composition, can add in crushing process, also can add after crushing process; Wherein solid dispersion is one or more in graphite, polynite and wilkinite, and add-on accounts for 0.01% ~ 20% of bituminous composition weight, preferably 5% ~ 10%; Coating agent be water soluble acrylic resin, water soluble alkyd resin, Polyester Resin Water Soluble or polyvinylpyrrolidone (PVP) one or more, add-on accounts for 0.01% ~ 5.0% of bituminous composition weight, preferably 0.5% ~ 1.0%.
The median size of Asphalt composition particle of the present invention is 50 ~ 130 μm, is preferably 60 ~ 100 μm.
Asphalt composition particle of the present invention, in oil drilling, is applied in the deep layer drilling fluid system of particularly wide temperature.
Compared with prior art, the invention has the advantages that: bituminous composition of the present invention adopts two kinds of softening temperatures, the pitch of two kinds of character combines, bituminous composition skin is coal-tar pitch, and coal-tar pitch fragility is large, easily pulverize under normal temperature, good with the adhesivity of borehole wall mud shale; The high low softening point asphalt that bituminous composition of the present invention mixes compared to direct mechanical, combine tightr between high low softening point asphalt, when temperature variation, can more effectively coordinate, " skin-middle junction-kernel " structure better can adapt to the consecutive variations of well temperature in drilling process; When well temperature is lower, the outer coal-tar pitch deliquescing that softening temperature is on the low side, plays the effect of shutoff, and inner high softening point bitumen, can improvement of mud cake as the particle filled composite of drilling fluid mud cake; During well temperature rise, the outer coal-tar pitch that softening temperature is on the low side first softening even trickling is adsorbed onto on clay particle, plays dispersion and protective colloid effect, is conducive to forming fine and close mud cake, inner high softening point bitumen, close to softening transform near softening temperature, plays the effect of shutoff.Bituminous composition of the present invention can carry out the modulation of softening temperature according to the actual needs to the inside of bituminous composition and outer field pitch, can continue to play a role within the scope of wider drilling depth.
Embodiment
To be further described the present invention by embodiment below, but not thereby limiting the invention, and percentage composition is wherein mass percentage.The testing method of softening temperature is carried out according to GB/T4507 method.High temperature and high pre ssure filtration is pressed SY/T5621 method and is measured.
embodiment 1
2g potassium permanganate joins in the coal-tar pitch (softening temperature is 60 DEG C) of 350g melting and mixes, then be transferred in stills for air blowing, carry out air blowing oxidation, after reaction terminates, oxidation material is sprayed to while hot 100g high softening point bitumen powder surface (softening temperature is 150 DEG C, and median size is 70 μm), is then cooled to room temperature, obtain bituminous composition, oxidizing condition and product property are in table 1.
By bituminous composition (the low temperature brittleness condition: temperature-25 DEG C of 100g through low temperature brittleness, 8 hours time), 16g graphite and 4g wilkinite, join in high speed disintegrator, mixing time 5s, grinding time 25s, add the water soluble acrylic resin of 1.5g, remix 4s, obtain Asphalt composition particle, be designated as A1, its median size is 100 μm.
embodiment 2
5g graphite and 5g wilkinite mix, join in the coal-tar pitch (softening temperature is 70 DEG C) of 300g melting, mix, be then transferred in stills for air blowing, carry out air blowing oxidation, after reaction terminates, oxidation material is sprayed to while hot 100g high softening point bitumen powder surface (softening temperature is 185 DEG C, and median size is 50 μm), is then cooled to room temperature, obtain bituminous composition, oxidizing condition and product property are in table 1.
By bituminous composition (the low temperature brittleness condition: temperature-10 DEG C of 100g through low temperature brittleness, 5 hours time), 5g graphite and 5g wilkinite, join in high speed disintegrator, mixing time 5s, grinding time 20s, add the water soluble acrylic resin of 2g, remix 4s, obtain Asphalt composition particle, be designated as A2, its median size is 80 μm.
embodiment 3
The coal-tar pitch (softening temperature is 90 DEG C) of 150g melting joins in stills for air blowing, carry out air blowing oxidation, after reaction terminates, (softening temperature is 200 DEG C oxidation material to be sprayed to while hot 100g high softening point bitumen powder surface, median size is 30 μm), then be cooled to room temperature, obtain bituminous composition, oxidizing condition and product property are in table 1.
By 100g bituminous composition, 3g graphite, 6g polynite and 0.5g cetyl trimethylammonium bromide, join in high speed disintegrator, mixing time 5s, grinding time 30s, obtains Asphalt composition particle, is designated as A3, and its median size is 50 μm.
comparative example 1
By the pitch powder through low temperature brittleness process (softening temperature is 120 DEG C, and median size is 80 μm) of 100g, 16g graphite and 4g wilkinite, join in high speed disintegrator, mixing time 5s, adds the water soluble acrylic resin of 1.5g, remix 4s, obtain Asphalt composition particle, be designated as A4.
comparative example 2
By the high softening point bitumen powder through low temperature brittleness process of 100g, (softening temperature is 185 DEG C, median size is 60 μm), 5g graphite and 5g wilkinite, join in high speed disintegrator, mixing time 5s, add the water soluble acrylic resin of 2g, remix 4s, obtains Asphalt composition particle, is designated as A5.
comparative example 3
Be the pitch (median size is 70 μm) of 155 DEG C by the softening temperature of 50g, 75g softening temperature be 120 DEG C coal-tar pitch (median size is 50 μm), 4g graphite, 7g polynite and 0.6g cetyl trimethylammonium bromide, join in high speed disintegrator, mixing time 5s, obtain Asphalt composition particle, be designated as A6.
comparative example 4
Be the pitch (median size is 40 μm) of 185 DEG C by the softening temperature of 50g, 50g softening temperature is coal-tar pitch (median size is 50 μm) 5g graphite, 5g polynite and the 1g cetyl trimethylammonium bromide of 160 DEG C, join in high speed disintegrator, mixing time 5s, obtain Asphalt composition particle, be designated as A7.
Table 1 bituminous composition preparation condition and product property.
The Asphalt composition particle obtained in above embodiment is joined the base slurry prepared, Asphalt composition particle add-on presses the percentages of base slurry quality, measure respectively under test pressure 3.45MPa condition differing temps aging after filter loss, concrete outcome is in table 2.Wherein base slurry preparation method is as follows: add 2.75g anhydrous sodium carbonate in 1000mL water, then add 60g calcium bentonite, and high-speed stirring 20 minutes maintenance 24 hours under room temperature, obtains 6% fresh water-based slurry.
Filter loss after table 2 Asphalt composition particle differing temps is aging.
Note: in table, temperature is Aging Temperature, and digestion time is 16 hours.
Claims (14)
1. the bituminous composition for drilling fluid, it is characterized in that: take high softening point bitumen as nuclear phase, outer layer covers high softening-point coal-tar pitch, this bituminous composition by mass percentage, comprise following component: high softening point bitumen 20% ~ 50%, high softening-point coal-tar pitch 50% ~ 80%; Wherein the softening temperature of high softening point bitumen is 140 ~ 260 DEG C, and the softening temperature of high softening-point coal-tar pitch is 100 ~ 180 DEG C.
2. according to bituminous composition according to claim 1, it is characterized in that: the softening point difference of high softening point bitumen and high softening-point coal-tar pitch is 15 ~ 40 DEG C.
3. according to bituminous composition according to claim 1, it is characterized in that: described high softening point bitumen is solid, powdery, median size≤100 μm.
4. according to bituminous composition according to claim 1, it is characterized in that: add water soluble fibre, sulfonated lignite, sulfonated phenol formaldehyde resin, sodium lauryl sulphate, Dodecyl trimethyl ammonium chloride, palmityl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, water soluble resin, polyvinylpyrrolidone, graphite, polynite or one or more additives bentonitic in bituminous composition, additive add-on accounts for 5% ~ 20% of bituminous composition gross weight; Wherein water soluble fibre is selected from one or more in carboxymethyl cellulose, polyvinyl alcohol fiber, WATER-SOLUBLE PVA FIBER; Water soluble resin is one or more in water soluble acrylic resin, water soluble alkyd resin, Polyester Resin Water Soluble.
5. the preparation method of a bituminous composition according to claim 1, it is characterized in that comprising following content: the coal-tar pitch of melting is joined in oxidation reactor, pass into air and carry out air blowing oxidation reaction, after reaction terminates, oxidation material is sprayed onto high softening point bitumen powder surface and forms parcel, cooling obtains bituminous composition, then joins in disintegrating apparatus and carries out co-grinding, namely prepare Asphalt composition particle.
6. in accordance with the method for claim 5, it is characterized in that: high softening point bitumen powder and solid dispersion are dry mixed, wherein the mass ratio of high softening point bitumen powder and solid dispersion is 10:1 ~ 20:1; Described solid dispersion is one or more in graphite, polynite, wilkinite or hydrotalcite.
7. in accordance with the method for claim 5, it is characterized in that: oxidation reaction condition is: gas flow is 0.05 ~ 1m
3kg
-1h
-1, oxidizing temperature is 220 ~ 300 DEG C, and oxidization time is 5 ~ 20 hours.
8. in accordance with the method for claim 5, it is characterized in that: in air blowing process, add promotor, promotor is one or more in hydrogen peroxide, Potcrate, potassium permanganate or iron(ic) chloride, and promotor add-on is the 0.1wt% ~ 1.0wt% accounting for coal-tar pitch quality.
9. in accordance with the method for claim 5, it is characterized in that: described coal-tar pitch is the coal-tar pitch after middle temperature or pyrogenic distillation, softening temperature is 50 ~ 95 DEG C.
10. in accordance with the method for claim 5, it is characterized in that: grinding time is 10 ~ 60s, pulverizing temperature for being not more than 20 DEG C.
11. in accordance with the method for claim 5, it is characterized in that: bituminous composition carries out low temperature brittleness process before pulverizing, and low temperature brittleness treatment condition are: temperature is 0 ~-60 DEG C, and the time is 2 ~ 48 hours.
12. in accordance with the method for claim 5, it is characterized in that: add coating agent in described preparation process and/or solid dispersion mixes with bituminous composition; Wherein solid dispersion is one or more in graphite, polynite and wilkinite, and add-on accounts for 0.01% ~ 20% of bituminous composition weight; Coating agent be water soluble acrylic resin, water soluble alkyd resin, Polyester Resin Water Soluble or polyvinylpyrrolidone one or more, add-on accounts for 0.01% ~ 5.0% of bituminous composition weight.
Asphalt composition particle prepared by 13. claim 5 ~ 12 either method, is characterized in that: the median size of Asphalt composition particle is 50 ~ 130 μm.
14. Asphalt composition particle according to claim 13 are applied in drilling fluid system.
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|---|---|---|---|
| CN201310496045.8A CN104559955B (en) | 2013-10-22 | 2013-10-22 | It is a kind of for bituminous composition of drilling fluid and preparation method thereof |
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|---|---|---|---|
| CN201310496045.8A CN104559955B (en) | 2013-10-22 | 2013-10-22 | It is a kind of for bituminous composition of drilling fluid and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325230A (en) * | 2017-06-30 | 2017-11-07 | 常州市瑞泰物资有限公司 | A kind of preparation method of drilling fluid coating agent |
| US10851280B2 (en) | 2015-11-02 | 2020-12-01 | China Petroleum & Chemical Corporation | Modified asphalt particles and preparation method and use thereof |
| WO2023039074A1 (en) * | 2021-09-08 | 2023-03-16 | Koppers Delaware, Inc. | Dispersion of coal tar pitch for coating graphitic materials and use in li-ion battery electrode production |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10851280B2 (en) | 2015-11-02 | 2020-12-01 | China Petroleum & Chemical Corporation | Modified asphalt particles and preparation method and use thereof |
| CN107325230A (en) * | 2017-06-30 | 2017-11-07 | 常州市瑞泰物资有限公司 | A kind of preparation method of drilling fluid coating agent |
| WO2023039074A1 (en) * | 2021-09-08 | 2023-03-16 | Koppers Delaware, Inc. | Dispersion of coal tar pitch for coating graphitic materials and use in li-ion battery electrode production |
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| CN104559955B (en) | 2017-08-22 |
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