CN104559968A - High-temperature resistant water-based drilling fluid and preparation method thereof - Google Patents
High-temperature resistant water-based drilling fluid and preparation method thereof Download PDFInfo
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- CN104559968A CN104559968A CN201310496434.0A CN201310496434A CN104559968A CN 104559968 A CN104559968 A CN 104559968A CN 201310496434 A CN201310496434 A CN 201310496434A CN 104559968 A CN104559968 A CN 104559968A
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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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
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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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
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Abstract
The invention discloses a high-temperature resistant water-based drilling fluid and a preparation method thereof. The high-temperature resistant water-based drilling fluid comprises the following components in percentage by mass: 85%-97% of basic mud and 3%-15% of asphaltic liquid of a high softening point. The preparation method comprises the following steps: (1), adding asphaltic raw materials of a high softening point into water for performing crushing, adding a stable dispersant, and uniformly mixing the crushed asphaltic raw materials and the stable dispersant so as to obtain the asphaltic liquid of the high softening point; (2),uniformly mixing the asphaltic liquid of the high softening point, a performance modifying agent and the basic mud so as to obtain the high-temperature resistant water-based drilling fluid. In the water-based drilling fluid disclosed by the invention, the dispersion of asphaltic particles of a high softening point is uniform and stable; the water-based drilling liquid is high in high temperature resistance and filtration resistance; the preparation method is simple and convenient, the cost is reduced, and the applied range is wide.
Description
Technical field
The present invention relates to a kind of drilling fluid and preparation method thereof, particularly containing high softening point bitumen composition drilling fluid, belong to petroleum drilling production technique field.
Background technology
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 to the use properties of drilling fluid, and particularly high-temperature resistance is had higher requirement.Asphalt product, as important additive for drilling fluid, has good anti-collapse, lubrication, comprehensive effectiveness such as reduction leak-off and high-temperature stable etc.But the high-temperature service requirement that general softening point asphalt cannot be able to meet under deep-well because overbating even trickling.
High softening point bitumen refers to that softening temperature is more than 100 DEG C, the pitch especially more than 120 DEG C.High softening point bitumen has because of its outstanding high-temperature resistance to be applied more widely.High softening point bitumen may be used in the drilling operation in deep-seated oil gas field, as the important component part of drilling fluid, can play shutoff, anti-collapse, stabilizing borehole under the high temperature conditions, reduce the effect of filter loss.
In order to improve the use properties of drilling fluid asphalt product, successively disclosing a lot of method carries out modification to pitch both at home and abroad.Wherein topmost method just carries out sulfonation to pitch.As US3485745, CN99109453, CN201010250241 etc.Although this method can increase the water-soluble of product, oil solution ratio is lower.Pitch mainly generates sulfonate after sulfonation, and the softening temperature of product does not almost measure, and can only use under lower temperature condition.And its particle does not have elasticity, deformability poor, the duct in well can not be embedded arbitrarily, particularly irregular shape duct, the effect of shutoff and filtrate reducing can not be played well.Meanwhile, this technique is more complicated, easily pollutes environment.
Drilling fluid is divided into oil base drilling fluid and water-base drilling fluid with its external phase.High softening-point petroleum pitch mainly based on oil soluble, so in oil base drilling fluid good dispersity, application is not a problem.But in water-base drilling fluid, because it is water-soluble very little, there is difficulties in dispersion, not easily stable problem.This is also a principal element of restriction high softening point bitumen widespread use in water-base drilling fluid.
When high softening point bitumen uses in drilling fluid, require with minimum Granular composite in mud system, so both can ensure that pitch is uniformly dispersed, can avoid again being agglomerated into large block blocking vibration sieve and cause the generation of problems such as cannot using.Under normal circumstances, the Particle size requirements of pitch particle is below 150 μm, and even 120 μm have good result of use with below.
But pitch belongs to temperature-sensitive material, when pulverizing or superfine grinding, very large cost can be increased.Namely allow to obtain tiny pitch particle, it is also very very difficult for wanting stable dispersion in water-base drilling fluid.If stable dispersion the effect of shutoff and filtrate reducing just can not cannot be played in down-hole.
Summary of the invention
Not easily pulverize at high softening point bitumen for prior art, particle after pulverizing is difficult to Problems existing in stable dispersion etc. in water-base drilling fluid, the invention provides a kind of high-temperature resistant water-based drilling fluid and preparation method thereof, in water-base drilling fluid of the present invention, high softening point bitumen Granular composite is even, stable, and drilling fluid high temperature resistance filtration capacity is strong, and preparation method is easy, cost-saving, applied widely.
High-temperature resistant water-based drilling fluid of the present invention, in mass percentage, comprises following component:
Base is starched: 85% ~ 97%;
High softening point bitumen liquid: 3% ~ 15%.
In drilling fluid of the present invention, described base slurry is the water-base drilling fluid base slurry of this area routine, can conventionally prepare, and the composition of base slurry and preparation process are known for those skilled in the art; As carried out according to following preparation process: add anhydrous sodium carbonate in water, then add calcium bentonite, high-speed stirring also obtains after maintenance certain hour.
In the inventive method, high softening point bitumen liquid by mass percentage, comprises following component: high softening point bitumen: 30% ~ 70%, stable dispersant: 1% ~ 10%, water: 20% ~ 60%.Wherein in high softening point bitumen liquid, preferably add latex, the add-on of latex accounts for 10% ~ 30% of high softening point bitumen liquid quality, and each component concentration sum of high softening point bitumen liquid is 100%.
Wherein, the softening temperature of described high softening point bitumen is 120 ~ 220 DEG C, is selected from one or more mixing in oxidized bitumen, solution-off pitch or rock asphalt.
Described stable dispersant is one or more in vitriol, quaternary ammonium salt or sulfonated lignin, and wherein vitriol is one or more in modification bay alcohol radical sodium sulfate, secondary alcohol groups sodium sulfate and mixed fatty alcohol sodium sulfate etc.; Quaternary ammonium salt is one or more in Dodecyl trimethyl ammonium chloride, palmityl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride etc.; Sulfonated lignin are sodium lignosulfonate or calcium lignin sulphonate.
Described latex is one or more in natural rubber latex, styrene-butadiene latex, nitrile rubber, polychloroprene latex, polystyrene latex or polybutadiene latex.
In drilling fluid of the present invention, preferably adding one or more properties modifiers in treated starch or water soluble fibre, take drilling mud weight as benchmark, and add-on is 0.1% ~ 5%, and each component sum of drilling mud weight is 100%; Wherein said treated starch is one or more in phosphate ester starch, carboxymethyl starch or cationic starch etc.; Described water soluble fibre is one or more in carboxymethyl cellulose (CMC), polyvinyl alcohol fiber and WATER-SOLUBLE PVA FIBER.
The preparation method of high-temperature resistant water-based drilling fluid of the present invention, comprises following content: high softening point bitumen raw material is added to the water and pulverizes by (1), then adds stable dispersant, mixes, and obtains high softening point bitumen liquid; (2) high softening point bitumen liquid, properties modifier and base slurry is mixed, obtain high-temperature resistant water-based drilling fluid.
Wherein, high softening point bitumen liquid medium pitch mean particle size≤120 μm described in step (1).Described disintegrating apparatus can be the one in high-speed shearing emulsion machine, colloidal mill or shredder, grinding time 30 ~ 60 minutes.In high softening point bitumen liquid preparation process, preferably add latex, latex and stable dispersant can add jointly, also can successively add; Preferably first add latex to mix, then add stable dispersant and mix, mixing process can be carried out in disintegrating apparatus, and also can be transferred in the equipment with mixing functions and carry out, mixing time is generally 5 ~ 30 minutes.Whole process can be carried out at normal temperatures, and water temperature is not generally higher than 40 DEG C.Described latex is one or more in natural rubber latex, styrene-butadiene latex, nitrile rubber, polychloroprene latex, polystyrene latex or polybutadiene latex, and solid content is 20wt% ~ 60wt%.
Mixing process in step (2) can adopt the technique means such as standard machinery stirring, high-shear, colloidal mill or ultrasonic disperse, and mixing time, according to the degree of uniformity of material system, is generally 5 ~ 30 minutes.
The present invention compared with prior art, has the following advantages:
(1) due to its special physical property of pitch, common mechanical disintegration mode all can pulverize process in release a large amount of heat, can make pitch along with temperature rising deliquescing, become sticky, pulverized small-particle is easy to again be bonded to large particle.At present, generally adopt freezing and pulverizing, and add a large amount of inert materials, not only increase cost, and easily in drilling fluid, introduce impurity.The present invention adopts the method carrying out pulverizing in water, and water can, as heat-eliminating medium, prevent crushing process heat release from causing the generation of the problems such as pitch bonding.In addition, the important component part of water inherently drilling fluid, so can not bring any impurity with during asphaltic liquid configuration drilling fluid.
(2) high softening point bitumen liquid of the present invention, introduces latex as properties-correcting agent.On the one hand, latex and pitch particle have good affinity, can be attached to pitch particle surface equably, and pitch particle is more easily stably dispersed in water; Enhance the deformability of particle simultaneously, namely increase the viscoelastic use range of particle.On the other hand, in drilling operation, particle is under the effect of pressure with other external force, and small part latex can form film between the borehole wall and mud cake, improves the compactness of mud cake, serves the effect well reducing high temperature and high pre ssure filtration.
(3) high softening point bitumen liquid of the present invention, the stable dispersant added, be with surface-active material, the pitch particle crushed can be made to be distributed to uniformly and stably in the middle of liquid phase, and the effect of stablizing whole drilling fluid system also can be played in preparation drilling fluid process, increase the use properties of drilling fluid; Water-base drilling fluid of the present invention, also adds properties modifier, other components can be coordinated to be conducive to forming colloidal form dispersion, can change the rheological property of system to a certain extent in the middle of drilling fluid system.
The present invention is by preparing the method for drilling fluid after first high softening point bitumen being made asphaltic liquid again, not only solve a difficult problem for pitch ambient ground, and by the synergy of the various additives such as properties-correcting agent, stable dispersant, properties modifier, can make that high softening point bitumen is particle stabilized to be dispersed in water-base drilling fluid.Gained of the present invention is contained the water-base drilling fluid of modification high softening point bitumen, carry out the performance test such as system viscosity, high temperature and high pre ssure filtration, test-results shows that it is carried sticky effect, the yield value of system and High Temperature High Pressure filtration reduction and is significantly improved.
Drilling fluid of the present invention can use in the deep-well in oil field, ultra-deep well drilling operation.
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 base slurry preparation process adopted in the embodiment of the present invention is as follows: add 2.75g anhydrous sodium carbonate in every 1000mL water, then add 60g calcium bentonite, high-speed stirring 20min is maintenance 24h under room temperature, obtains 6% fresh water-based slurry.
Embodiment 1
To be the oxidized bitumen of 146.6 DEG C and 50g softening temperature by 50g softening temperature be, and the solution-off pitch of 143.3 DEG C joins in 85g water, high-shear emulsion machine is adopted to shear 40 minutes, add 15g palmityl trimethyl ammonium chloride, continue shearing 20 minutes, obtain high softening point bitumen liquid (pitch median size 96 μm).
24g high softening point bitumen liquid is placed in the drilling fluid base slurry that 400ml prepares, add the carboxymethyl starch accounting for drilling fluid quality 3%, high speed shear 15 minutes, obtains high-temperature resistant water-based drilling fluid.
Embodiment 2
Be that the oxidized bitumen of 161.6 DEG C joins in 50g water by 115g softening temperature, high-shear emulsion machine is adopted to shear 40 minutes, add 25g polychloroprene latex (solid content 30%) and 10g modification bay alcohol radical sodium sulfate, continue shearing 25 minutes, obtain high softening point bitumen liquid (pitch median size 90 μm).
20g high softening point bitumen liquid is placed in the drilling fluid base slurry that 400ml prepares, high speed shear 20 minutes, obtains high-temperature resistant water-based drilling fluid.
Embodiment 3
By the oxidized bitumen that 90g softening temperature is 153.0 DEG C, join in 80g water, adopt high-shear emulsion machine to shear 30 minutes, add 16g styrene-butadiene latex (solid content 40%) and 14g sodium lignosulfonate continuation shearing 15 minutes, obtain high softening point bitumen liquid (pitch median size 108 μm).
18g high softening point bitumen liquid is placed in the drilling fluid base slurry that 400ml prepares, add the phosphate ester starch accounting for drilling fluid quality 1.5%, high speed shear 10 minutes, obtains high-temperature resistant water-based drilling fluid.
Embodiment 4
Be that the oxidized bitumen of 161.6 DEG C joins in 50g water by 115g softening temperature, adopt high-shear emulsion machine to shear 40 minutes, add 25g polychloroprene latex (solid content 30%) and 10g modification bay alcohol radical sodium sulfate, continuation shearing 25 minutes, obtains high softening point bitumen liquid.(pitch median size 90 μm)
20g high softening point bitumen liquid is placed in the drilling fluid base slurry that 400ml prepares, add the cationic starch accounting for drilling fluid quality 4%, high speed shear 20 minutes, obtains high-temperature resistant water-based drilling fluid.
Comparative example 1
To be the oxidized bitumen of 146.6 DEG C and 50g softening temperature by 50g softening temperature the be solution-off pitch of 143.3 DEG C at-20 DEG C freezing 5 hours, 20s is pulverized in Miniature universal pulverizer, add 15g palmityl trimethyl ammonium chloride again, continue to pulverize 10s, obtain high softening point bitumen powder.(pitch median size 134 μm)
12g high softening point bitumen powder is placed in the drilling fluid base slurry that 400ml prepares, add the carboxymethyl starch accounting for drilling fluid quality 3%, high speed shear 15 minutes, obtains water-base drilling fluid.
Comparative example 2
By the oxidized bitumen that 90g softening temperature is 153.0 DEG C, join in 94g water, adopt high-shear emulsion machine to shear 30 minutes, add 16g styrene-butadiene latex (solid content 40%) and continue shearing 15 minutes, obtain modification high softening point bitumen liquid.(pitch median size 115 μm)
18g high softening point bitumen liquid is placed in the drilling fluid base slurry that 400ml prepares, add the phosphate ester starch accounting for drilling fluid quality 1.5%, high speed shear 10 minutes, obtains high-temperature resistant water-based drilling fluid.
The character of water-base drilling fluid in table 1 embodiment and comparative example.
Note: digestion time is 16 hours, Aging Temperature is 150 DEG C.
The particle diameter of medium pitch liquid medium pitch particle of the present invention adopts microscopic examination, and carries scale mensuration with microscope.The testing method of softening temperature is carried out according to GB/T4507 method.Viscosity and high temperature and high pre ssure filtration are undertaken by GB/T 16783 method.AV represents apparent viscosity, and PV represents plastic viscosity, and YP represents yield value.
Claims (13)
1. a high-temperature resistant water-based drilling fluid, is characterized in that: in mass percentage, comprises following component: base is starched: 85% ~ 97%, high softening point bitumen liquid: 3% ~ 15%; Wherein said high softening point bitumen liquid by mass percentage, comprises following component: high softening point bitumen: 30% ~ 70%, stable dispersant: 1% ~ 10%, water: 20% ~ 60%.
2. according to drilling fluid according to claim 1, it is characterized in that: add latex in high softening point bitumen liquid, with high softening point bitumen liquid quality for benchmark, latex amounts is 10% ~ 30%.
3. according to drilling fluid according to claim 1, it is characterized in that: the softening temperature of described high softening point bitumen is 120 ~ 220 DEG C, be selected from one or more mixing in oxidized bitumen, solution-off pitch or rock asphalt.
4. according to drilling fluid according to claim 1, it is characterized in that: described stable dispersant is one or more in vitriol, quaternary ammonium salt or sulfonated lignin, wherein vitriol is one or more in modification bay alcohol radical sodium sulfate, secondary alcohol groups sodium sulfate and mixed fatty alcohol sodium sulfate etc.; Quaternary ammonium salt is one or more in Dodecyl trimethyl ammonium chloride, palmityl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride; Sulfonated lignin are sodium lignosulfonate or calcium lignin sulphonate.
5. according to drilling fluid according to claim 2, it is characterized in that: described latex is one or more in natural rubber latex, styrene-butadiene latex, nitrile rubber, polychloroprene latex, polystyrene latex or polybutadiene latex.
6. according to the drilling fluid described in claim 1 or 2, it is characterized in that: add one or more properties modifiers in treated starch or water soluble fibre in drilling fluid, take drilling mud weight as benchmark, and add-on is 0.1% ~ 5%.
7. according to drilling fluid according to claim 6, it is characterized in that: described treated starch is one or more in phosphate ester starch, carboxymethyl starch or cationic starch; Described water soluble fibre is one or more in carboxymethyl cellulose, polyvinyl alcohol fiber and WATER-SOLUBLE PVA FIBER.
8. the preparation method of a high-temperature resistant water-based drilling fluid according to claim 1, it is characterized in that comprising following content: high softening point bitumen raw material is added to the water and pulverizes by (1), then add stable dispersant, mix, namely obtain high softening point bitumen liquid; (2) high softening point bitumen liquid, properties modifier and base slurry is mixed, obtain high-temperature resistant water-based drilling fluid.
9. in accordance with the method for claim 8, it is characterized in that: described high softening point bitumen liquid medium pitch mean particle size≤120 μm.
10. in accordance with the method for claim 8, it is characterized in that: described disintegrating apparatus is the one in high-speed shearing emulsion machine, colloidal mill or shredder, grinding time 30 ~ 60 minutes.
11. in accordance with the method for claim 8, it is characterized in that: add latex in high softening point bitumen liquid preparation process, and latex and stable dispersant jointly add or successively add.
12. in accordance with the method for claim 8, it is characterized in that: first add latex in high softening point bitumen liquid preparation process and mix, then add stable dispersant and mix.
13. in accordance with the method for claim 8, it is characterized in that: mixing process adopts one or more in standard machinery stirring, high-shear, colloidal mill or ultrasonic disperse technique means.
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| CN106634891A (en) * | 2015-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | High-temperature resistant water-based drilling fluid and preparation method thereof |
| CN106633936A (en) * | 2015-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | Asphalt grain with high softening point, preparation method thereof and application |
| CN106753285A (en) * | 2016-12-08 | 2017-05-31 | 辽宁石油化工大学 | A kind of high-temperature resistant water-based drilling fluid and preparation method thereof |
| CN108504339A (en) * | 2018-03-26 | 2018-09-07 | 中国石油天然气集团有限公司 | A kind of water-base drilling fluid and its preparation method and application suitable for compact oil reservoir |
| CN108690578A (en) * | 2017-04-10 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of water-base drilling fluid and preparation method thereof |
| CN108690577A (en) * | 2017-04-10 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of water-base drilling fluid and preparation method thereof |
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| CN111662690A (en) * | 2020-07-09 | 2020-09-15 | 南京良友化工有限公司 | High-temperature-resistant tackifier for drilling fluid and production method thereof |
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| CN106634891A (en) * | 2015-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | High-temperature resistant water-based drilling fluid and preparation method thereof |
| CN106633936B (en) * | 2015-11-02 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of high softening point bitumen particle, preparation method and application |
| CN106634891B (en) * | 2015-11-02 | 2019-07-12 | 中国石油化工股份有限公司 | A kind of high-temperature resistant water base drilling fluid and preparation method thereof |
| CN106753285A (en) * | 2016-12-08 | 2017-05-31 | 辽宁石油化工大学 | A kind of high-temperature resistant water-based drilling fluid and preparation method thereof |
| CN108690578B (en) * | 2017-04-10 | 2020-11-10 | 中国石油化工股份有限公司 | Water-based drilling fluid and preparation method thereof |
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| CN108504339A (en) * | 2018-03-26 | 2018-09-07 | 中国石油天然气集团有限公司 | A kind of water-base drilling fluid and its preparation method and application suitable for compact oil reservoir |
| CN111057159A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Anti-collapse modified starch for drilling fluid and preparation method thereof |
| CN111057159B (en) * | 2018-10-16 | 2022-03-01 | 中国石油化工股份有限公司 | Anti-collapse modified starch for drilling fluid and preparation method thereof |
| CN111662690A (en) * | 2020-07-09 | 2020-09-15 | 南京良友化工有限公司 | High-temperature-resistant tackifier for drilling fluid and production method thereof |
| CN115232482A (en) * | 2021-04-22 | 2022-10-25 | 中国石油化工股份有限公司 | Modified cation emulsified asphalt and preparation method and application thereof |
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