CN105586021A - High-performance water-in-oil based drilling fluid and preparation method thereof - Google Patents
High-performance water-in-oil based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention provides water-in-oil drilling fluid and a preparation method thereof. The drilling fluid comprises an oil phase, a water phase and an additive; the additive comprises high-softening point asphalt composition particles, a promoter, a modifier, and an emulsifier. Addition of the high-softening point asphalt composition particles is 1-5% of the total mass of the drilling fluid. Average particle size of the high-softening point asphalt composition particles is less than 60 mesh. The drilling fluid solves the problems of plugging and bad leak-off reduction effect, because good particle state and high temperature deformation capability cannot be kept due to extra high oil solubility, when the high-softening point asphalt is applied to oil base drilling fluid. At the same time, heat stability and electrical stability of the water-in-oil drilling fluid are substantially improved, so that the drilling liquid can be widely applied to the process of deep oil gas drilling operation.
Description
Technical field
The present invention relates to a kind of water-in-oil based water drilling fluid and preparation method thereof, particularly contain high softening point bitumen composition drilling fluid, belong to oil drilling production technique field.
Background technology
Along with oil-gas exploration is progressively to Deep Development, the chance of boring chance HTHP stratum increases gradually. These are all had higher requirement to drilling fluid system. Compared with water-base drilling fluid, it is strong that oil base drilling fluid has contamination resistance, and lubricity is good, and strong inhibition capability is conducive to keep wellbore stability, can protect to greatest extent oil-gas Layer, is easy to the features such as maintenance. The high-temperature stability that oil base drilling fluid is good and inhibition, make it boring Holes of Complicated Wells, particularly bores in high temperature deep well and water-sensitive strata, and advantage is more obvious. Can effectively protect water sensitivity oil-gas Layer, improve oil and gas production.
Oil base drilling fluid refers to the drilling fluid using oil as continuous phase, is divided into full oil base drilling fluid and invert oil-emulsion drilling fluid. In full oil base drilling fluid, water content is many below 5%. Invert oil-emulsion drilling fluid is made up of oil, water, emulsifying agent, fluid loss additive, equilibrium of activation agent etc., and in drilling fluid, water content is between 5%-30%. But the water content in the invert mud of high temperature resistance more than 180 DEG C, generally at 5%-10%, seldom exceedes more than 15%. The increase of water content, can make the yield value of system increase, and rheological characteristic improves, and improves the ability of cutting carring. But can make its heat endurance and electrical stability decline. For ensureing the invert mud of electrical stability, particularly high water content of invert mud system, need to use a large amount of multiple emulsifying agents, the amphipathic property that this can change rock surface in hole, causes formation damage. CN1661958 discloses a kind of synthetic base drilling fluid, although can keep good rheological characteristic and electrical stability after aging 16 hours at 150 DEG C, water content is up to 25%. And serviceability under higher temperature and water content has no report.
Although oil base drilling fluid advantage is a lot, while application in high temperature deep well, the high temperature resistance inorganic agent adapting to it has but become one of the factor of its development that restricts. Fluid loss additive in inorganic agent is mainly used in controlling filter loss and the stability of drilling fluid system. For the environment for use of this HTHP, develop one dissolubility in oil base drilling fluid abroad good, the oil-soluble polymers particle fluid loss additive that high-temperature resistance is strong. This polymer beads filters Cheng Zhongneng and forms thin and yielding mud cake in outside falling, interior polymeric composition granule can shutoff formation pore. Though can play, filtration effect falls preferably, expensive.
Asphalt product is compared with special copolymer, cheap and material source is extensive, is one of indispensable important dose of kind of domestic and international modern drilling engineering, have good anti-collapse, lubricated, reduce the comprehensive effectivenesses such as leak-off and high-temperature stable. But general softening point asphalt can cannot meet the high-temperature operation requirement under deep-well because overbating even trickling.
High softening point bitumen refers to that softening point is more than 100 DEG C, the especially pitch more than 120 DEG C. High softening point bitumen is applied because its outstanding high-temperature resistance has more widely. High softening point bitumen can, in the drillng operation in Deep Oil And Gas Exploration field, as the important component part of drilling fluid, can play shutoff, anti-collapse under hot conditions, and stabilizing borehole reduces the effect of filter loss.
But simple high softening point bitumen particle is in the middle of being applied to drilling fluid system time, because particle deformability is relatively limited, viscoplasticity is relatively poor, while existing oil-gas Layer duct irregular, can not embed well its medium problem. And softening point is higher, pitch crisp rigid more obvious, is difficult to play good shutoff and falls filtration effect. CN102304353A and CN103013460A disclose a kind of method that rubber powder, bitumen and calcium carbonate superfine powder are mixed by a certain percentage, pulverized and have prepared pitch particle composition, and what have has also added polymer fiber etc. This method is just mixed rubber powder (He or polymer fiber) and pitch simply, and the two does not form organic whole, is difficult to continue to play a role in wider viscoelastic region.
In addition, pitch used is bitumen, and softening point is wayward or between 80 to 120 DEG C, oily molten thing content, up to more than 98%, while use, is all dissolved in the middle of oil phase high temperature resistant property variation in oil base drilling fluid substantially. Soak swellingly and rubber powder is long-time in the continuous phase of white oil or diesel oil composition, may occur coalescently, destroy the stability of whole drilling fluid system.
Summary of the invention
Be applied in invert mud process and exist oily solubility too high at pitch particle for prior art, in drilling fluid system, lack pitch particle effective shutoff is carried out in duct, stratum and crack, its filter loss is increased, the problems such as suspending power and high-temperature resistance variation, the invention provides a kind of high-performance water-in-oil based water drilling fluid, effectively to overcome above defect.
The present invention joins in oil base drilling fluid by the composition grain of high softening point bitumen and rubber powder being made to special construction, and add the suitable additive such as promoter, modifier, both some can be dissolved into play in drilling fluid oil phase and carried sticky cutting and lubrication to make high softening point bitumen particle, can in drilling fluid, keep again certain graininess, play shutoff well, anti-collapse and fall filtration effect, improved the large rock-carrying ability of drilling fluid simultaneously. In addition, the present invention, by modifier and the special mode that adds introduced, in the time of the invert mud of preparation high water content, can only need a little emulsifying agent even not add in the situation of other emulsifying agent, obtain stable drilling fluid system, ensured the serviceability of invert mud.
The invention provides a kind of high-performance invert mud, comprise profit base fluid and additive. Wherein profit base fluid is by volume: oil phase: water=90:10～60:40. Wherein water is the calcium chloride water of 10～30% concentration and the mixed liquor of modifier. The volume ratio of calcium chloride water and modifier is 1:1～1:4. Described modifier is latex, can be one or more in Heveatex, styrene-butadiene latex, NBR latex, polychloroprene latex, polystyrene latex or polybutadiene latex, and the solid content of latex is 20wt%～40wt%.
Described oil phase can be diesel oil, biodiesel, white oil, plant wet goods, preferably white oil.
Additive, in profit base fluid quality, comprises following component:
(1) emulsifying agent: 0～3%
(2) organoclay: 1～3%
(3) properties modifier: 1～5%.
In drilling fluid, also can add heavy weight additive, make drilling fluid density reach 1.50～2.10g/cm3。
Emulsifying agent is higher fatty acid amide series of surfactants, as one or more in lauroyl diethanolamine, oleamide, oleoyl diethanol amine, cocounut oil acyl diethanol amine. Also can be polyoxyethylene carboxylate series, as one or more in rosin acid polyoxyethylene ester, polyoxyethylene oleic acid ester, polyoxyethylene stearic acid ester. Heavy weight additive can be barite, lime stone, or their mixture.
Properties modifier comprises modification high softening point bitumen composition grain and promoter, and wherein high softening point bitumen composition grain addition accounts for 1% ~ 5% of drilling fluid gross mass; High softening point bitumen composition grain by mass percentage, comprises following component: (1) basic asphalt 50wt%～80wt%; (2) rubber powder particle 20wt%～50wt%. The average grain diameter of bituminous composition particle is for being less than 60 orders.
Wherein, described basic asphalt is high softening point bitumen, and its softening point is 120 ~ 220 DEG C. Basic asphalt can be asphalt and/or coal tar pitch, is preferably the mixture of asphalt and coal tar pitch, and wherein asphalt accounts for 30%～70% of basic asphalt quality, and coal tar pitch accounts for 70%～30% of basic asphalt quality. Wherein asphalt is one or more mixing in oxidized asphalt, solution-off pitch or bitumen, and coal tar pitch is the product that coal tar obtains after middle temperature or high temperature distillation.
Described rubber powder particle is one or more in butyl rubber rubber powder, acrylonitrile-butadiene rubber rubber powder, neoprene rubber powder, butadiene-styrene rubber rubber powder or fluorine-containing rubber rubber powder.
In bituminous composition particle of the present invention, preferably add promoter, in bituminous composition particle weight part, promoter addition is 1～10 weight portion, wherein promoter is one or more in sulfate, quaternary ammonium salt or lignosulfonates, and wherein sulfate is one or more in modification bay alcohol radical sodium sulphate, secondary alcohol groups sodium sulphate and mixed fatty alcohol sodium sulphate etc.; Quaternary ammonium salt is one or more in DTAC, hexadecyltrimethylammonium chloride, OTAC etc.; Lignosulfonates are sodium lignin sulfonate or calcium lignosulfonate.
Drilling fluid preparation method of the present invention comprises following process:
(1) prepare high softening point bitumen composition grain;
(2) prepare drilling fluid: first measure base oil by required oil-water ratio graduated cylinder, pack in the container with agitating device, add emulsifying agent, high-speed stirred 15～20 minutes, adds organoclay at normal temperatures, stir 5～10 minutes. After latex and calcium chloride water are mixed in required ratio, mixed liquor is squeezed in oil phase with high-pressure injection rifle, still constantly stirred squeezing in process, then add high softening point bitumen composition grain, continue stirring 20～40 minutes. Add heavy weight additive, drilling fluid density is adjusted to desired value, stir 10～20 minutes, obtain stable invert oil-emulsion drilling fluid.
In above-mentioned preparation process (1), the preparation process of high softening point bitumen composition grain is as follows:
High softening point bitumen is heated to molten state, is evenly sprayed onto on preheated rubber powder particle, leave standstill infiltration a period of time, vibrate pulverizing after freezing in vibratory sieve, wherein vibratory sieve sieve aperture is for being greater than 60 mesh standard sieves. Lower part of screen is divided and is the bituminous composition particle obtaining.
In the inventive method, described rubber powder particle can be commercially available waste-tyre rubber-powder product, the composition of the preferred asphalt of high softening point bitumen and coal tar pitch. The mass ratio of high softening point bitumen and rubber powder particle is 4:1～1:1.
In the inventive method, spray high softening point bitumen liquid and can adopt the equipment with spraying function, as watering can, spraying machine, sprayer etc., in sprinkling process, can material be stirred or be mixed and stirred, make the high softening point bitumen liquid of melting be dispersed in rubber powder particle surface.
In the inventive method, 50～120 DEG C of described rubber powder particle preheat temperatures, 0.5～2 hour preheating time; Described standing time of penetration is 0.5 ~ 5 hour, leaves standstill infiltration at 100～200 DEG C of temperature. Then cool to room temperature.
In the inventive method, freezing condition is: cryogenic temperature is-10～-50 DEG C, preferably-20 ~-40 DEG C, and cooling time 5～24 hours, preferably 10 ~ 18 hours. Vibration grinding time is 1～100s, preferably 10～50s.
In the inventive method, preferably in preparation process, add promoter, promoter need add before vibration is pulverized.
The present invention compared with prior art, has the following advantages:
(1), in the time preparing high softening point bitumen composition, introduced rubber powder as modifier. In preparation process, adopt and first high softening point bitumen is evenly sprayed to rubber powder granule surface, and then carry out freezing and vibration pulverize method, can form taking rubber powder granule as nuclear phase, modified pitch particle taking high softening point bitumen as shell, pitch and rubber powder are organically combined as a whole, have not only improved the high temperature resistant property of particle, also increase its deformability simultaneously, it is more easily embedded and stitch, played the effect of good reduction high temperature and high pre ssure filtration. In preparation process, adopt the method for spraying simple, and easily evenly; Standing infiltration a period of time can make to be combined better between high softening point bitumen and rubber powder particle at a certain temperature.
(2) basic asphalt that the present invention adopts is the high softening point bitumen of softening point more than 120 DEG C, has improved its high-temperature resistance in down-hole application. Adopt asphalt and the composite method of coal tar pitch can regulate the molten thing content of oil of pitch particle, because the solubility of coal tar pitch in oil is about 60～80%, and asphalt solubility is more than 98%. In the time that this high softening point bitumen particle is used for oil base drilling fluid, both some can be dissolved in drilling fluid oil phase and play and carry sticky cutting and lubrication, can in drilling fluid, keep again certain graininess, simultaneously, the number of the molten thing content of coal tar can regulate the size of particle, play shutoff well, anti-collapse and fall filtration effect, improved the large rock-carrying ability of drilling fluid. The present invention is taking rubber powder granule as nuclear phase, and the modified pitch particle taking composite high softening point bitumen as shell, in the time being applied to oil base drilling fluid, without adding again the additive such as lubricant and Ti Qie agent, simplify the step of drilling fluid preparation, saved cost, played the multiplex effect of potion.
(3) adopt asphalt and coal tar pitch to carry out composite, reduced the difficulty while pulverizing, the promoter simultaneously adding, is with surface-active pressed powder, can prevent that pitch particle is bonded together; On the other hand, join in drilling fluid, these surfactants can make pitch particle be distributed to uniformly and stably in the middle of drilling fluid system, increase the serviceability of drilling fluid.
(4) join in invert mud using latex as modifier, on the one hand, in drillng operation, due to the effect of pressure and other external force, small part latex can form film between the borehole wall and mud cake, improve the compactness of mud cake, played the effect of good reduction high temperature and high pre ssure filtration. On the other hand, the mixed liquor of latex and calcium chloride water composition adds fashionable in the mode of high velocity jet, water can be cut into tiny hydrone, promote oil-water emulsion, and latex itself contains certain surfactant, therefore only need add little emulsifying agent that even do not add, can obtain stable Water-In-Oil system. Heat endurance and the electrical stability of invert mud are all significantly improved. Avoided because using a large amount of multiple emulsifying agents, in the hole causing, the hydrophilic and oleophilic of rock surface sexually revises, and the infringement of reservoir.
(5) crack of oil-gas Layer or duct are not of uniform size, and the deformability of simple high softening point bitumen particle is limited after all, fine coupling with it, therefore easily cause and can not be embedded into arbitrarily the problems such as the duct of all size and shapes in well, be difficult to play desirable shutoff and fall filtration effect; The present invention adopts taking the rubber powder of suitable particle diameter as nuclear phase, the modification high softening point bitumen particle obtaining taking high softening point bitumen as shell, increase its viscoelastic scope of application, can in wider pore size distribution range, use, played good shutoff and the effect of stabilizing borehole.
Detailed description of the invention
To be further described the present invention by embodiment below, but not thereby limiting the invention, percentage composition is wherein quality percentage composition.
Embodiment 1
Get softening point and be the oxidized asphalt 30g of 140.3 DEG C, and softening point is the coal tar pitch 70g of 141.2 DEG C, is mixed and heated to molten condition. Get butadiene-styrene rubber rubber powder 45g, preheating 25 minutes at 100 DEG C of temperature. The high softening point bitumen having melted is placed in to watering can, high softening point bitumen is evenly sprayed onto on the particle of preheating, sprinkling limit, limit is stirred. After sprinkling finishes, under 130 DEG C of conditions, leave standstill 35 minutes, cool to room temperature. Then be placed in household freezer freezing (cryogenic temperature-30 DEG C, cooling time is 14 hours). After taking-up, put into vibratory sieve, add 7g hexadecyltrimethylammonium chloride. 80 mesh standard sieves are selected at the sieve end, and 35s is pulverized in vibration, obtains modification high softening point bitumen composition grain under sieve.
First measure 5# white oil (oil-water ratio 70:30) with graduated cylinder, pack in the container with agitating device, add 0.8% lauroyl diethanolamine, high-speed stirred 15 minutes, adds 1% organoclay at normal temperatures, stirs 5 minutes. By after calcium chloride water (concentration 20%) and polystyrene latex (solid content 20%) 1:2 mixing by volume, mixed liquor is squeezed in oil phase with high-pressure injection rifle, squeezing into still constantly stirring in process, then add 3.5% high softening point bitumen composition grain, continue to stir 30 minutes. Add heavy weight additive barite, drilling fluid density is adjusted to desired value, stir 10 minutes, obtain stable invert oil-emulsion drilling fluid.
Embodiment 2
Get softening point and be the oxidized asphalt 50g of 152.6 DEG C, and softening point is the coal tar pitch 50g of 150.2 DEG C, is mixed and heated to molten condition. Get acrylonitrile-butadiene rubber rubber powder 38g, preheating 20 minutes at 95 DEG C of temperature. The high softening point bitumen having melted is placed in to watering can, high softening point bitumen is evenly sprayed onto on the particle of preheating, sprinkling limit, limit is stirred. After sprinkling finishes, under 145 DEG C of conditions, leave standstill 30 minutes, cool to room temperature. Then be placed in household freezer freezing (cryogenic temperature-35 DEG C, cooling time is 10 hours). After taking-up, put into vibratory sieve, add 6.2g calcium lignosulfonate. 100 mesh standard sieves are selected at the sieve end, and 25s is pulverized in vibration, obtains modification high softening point bitumen composition grain under sieve.
First measure 4# white oil (oil-water ratio 75:25) with graduated cylinder, pack in the container with agitating device, add 1.0% rosin acid polyoxyethylene ester, high-speed stirred 20 minutes, adds 1.5% organoclay at normal temperatures, stirs 5 minutes. By after calcium chloride water (concentration 20%) and polychloroprene latex (solid content 30%) 1:1 mixing by volume, mixed liquor is squeezed in oil phase with high-pressure injection rifle, squeezing into still constantly stirring in process, then add 3% high softening point bitumen composition grain, continue to stir 25 minutes. Add heavy weight additive lime stone, drilling fluid density is adjusted to desired value, stir 20 minutes, obtain stable invert oil-emulsion drilling fluid.
Embodiment 3
Get softening point and be the oxidized asphalt 40g of 168.2 DEG C, and softening point is the coal tar pitch 60g of 170.5 DEG C, is mixed and heated to molten condition. Get butyl rubber rubber powder 56g, preheating 20 minutes at 110 DEG C of temperature. The high softening point bitumen having melted is placed in to watering can, high softening point bitumen is evenly sprayed onto on the particle of preheating, sprinkling limit, limit is stirred. After sprinkling finishes, under 155 DEG C of conditions, leave standstill 30 minutes, cool to room temperature. Then be placed in household freezer freezing (cryogenic temperature-25 DEG C, cooling time is 11 hours). After taking-up, put into vibratory sieve, add 5.8g sodium lignin sulfonate. 80 mesh standard sieves are selected at the sieve end, and 40s is pulverized in vibration, obtains modification high softening point bitumen composition grain under sieve.
First measure 3# white oil (oil-water ratio 65:35) with graduated cylinder, pack in the container with agitating device, add 1.6% oleoyl diethanol amine, high-speed stirred 20 minutes, adds 1% organoclay at normal temperatures, stirs 5 minutes. By after calcium chloride water (concentration 20%) and polybutadiene latex (solid content 20%) 1:3 mixing by volume, mixed liquor is squeezed in oil phase with high-pressure injection rifle, squeezing into still constantly stirring in process, then add 3.5% high softening point bitumen composition grain, continue to stir 20 minutes. Add heavy weight additive lime stone, drilling fluid density is adjusted to desired value, stir 25 minutes, obtain stable invert oil-emulsion drilling fluid.
Embodiment 4
Be the solution-off pitch 70g of 181.6 DEG C by softening point, and softening point is the coal tar pitch 30g of 183.2 DEG C, is mixed and heated to molten condition. Get butadiene-styrene rubber rubber powder 60g, preheating 20 minutes at 90 DEG C of temperature. The high softening point bitumen having melted is placed in to watering can, high softening point bitumen is evenly sprayed onto on the particle of preheating, sprinkling limit, limit is stirred. After sprinkling finishes, under 170 DEG C of conditions, leave standstill 25 minutes, cool to room temperature. Then be placed in household freezer freezing (cryogenic temperature-25 DEG C, cooling time is 12 hours). After taking-up, put into vibratory sieve, add 6.5g secondary alcohol groups sodium sulphate. 120 mesh standard sieves are selected at the sieve end, and 30s is pulverized in vibration, obtains modification high softening point bitumen composition grain under sieve.
First measure 4# white oil (oil-water ratio 80:20) with graduated cylinder, pack in the container with agitating device, high-speed stirred 20 minutes, adds 1% organoclay at normal temperatures, stirs 10 minutes. By after calcium chloride water (concentration 20%) and polychloroprene latex (solid content 25%) 1:1.5 mixing by volume, mixed liquor is squeezed in oil phase with high-pressure injection rifle, squeezing into still constantly stirring in process, then add 4% high softening point bitumen composition grain, continue to stir 35 minutes. Add heavy weight additive barite, drilling fluid density is adjusted to desired value, stir 25 minutes, obtain stable invert oil-emulsion drilling fluid.
Comparative example 1
First measure 5# white oil (oil-water ratio 70:30) with graduated cylinder, pack in the container with agitating device, add 0.8% lauroyl diethanolamine, high-speed stirred 15 minutes, adds 1% organoclay at normal temperatures, stirs 5 minutes. After 1:2 mixes by volume by calcium chloride water (concentration 20%) and polystyrene latex (solid content 20%), mixed liquor is squeezed in oil phase with high-pressure injection rifle, still constantly stirred 30 minutes squeezing in process. Add heavy weight additive, drilling fluid density is adjusted to desired value, stir 10 minutes, obtain invert oil-emulsion drilling fluid.
Comparative example 2
Get softening point and be the oxidized asphalt 30g of 140.3 DEG C, and softening point is the coal tar pitch 70g of 141.2 DEG C, gets neoprene rubber powder 45g, be then placed in household freezer freezing (cryogenic temperature-35 DEG C, cooling time is 14 hours). Taking-up adds 7g hexadecyltrimethylammonium chloride, in Miniature universal pulverizer, pulverizes 35s, selects 80 mesh standard sieve screenings, obtains high softening point bitumen rubber grain under sieve.
First measure 5# white oil (oil-water ratio 70:30) with graduated cylinder, pack in the container with agitating device, add 0.8% lauroyl diethanolamine, high-speed stirred 15 minutes, adds 1% organoclay at normal temperatures, stirs 5 minutes. By after calcium chloride water (concentration 20%) and polystyrene latex (solid content 20%) 1:2 mixing by volume, mixed liquor is squeezed in oil phase with high-pressure injection rifle, squeezing into still constantly stirring in process, then add 3.5% high softening point bitumen rubber grain, continue to stir 30 minutes. Add heavy weight additive barite, drilling fluid density is adjusted to desired value, stir 10 minutes, obtain stable invert oil-emulsion drilling fluid.
Measure respectively the character of drilling fluid in above-described embodiment and comparative example, in table 1.
Table 1 water-in-oil based water property of drilling fluid
Note: heat is rolled condition: the time is 16 hours, 180 DEG C of temperature;
Rheological characteristic probe temperature is 60 DEG C
High temperature and high pre ssure filtration condition determination: 180 DEG C, 3.5MPa
Wherein: AV: apparent viscosity
PV: plastic viscosity
YP: yield value
YP/PV: ratio of dynamic shear force/yield value to plastic viscosity
Can be found out by data in table: the water-in-oil based water drilling fluid that contains modification high softening point bitumen particle of the present invention, there is lower plastic viscosity, higher yield value, ratio of dynamic shear force/yield value to plastic viscosity and emulsion-breaking voltage, improve high-temperature resistance and the large rock-carrying ability of system. Particularly, in the higher invert mud system of water content, still maintain higher emulsion-breaking voltage, ensured the electrical stability of system.
Claims (12)
1. an invert mud, it is characterized in that: comprise profit base fluid and additive, wherein profit base fluid is by volume: oil phase: water=90:10～60:40, wherein water is the calcium chloride water of 10～30% concentration and the mixed liquor of modifier, and the volume ratio of calcium chloride water and modifier is 1:1～1:4.
2. according to invert mud claimed in claim 1, it is characterized in that: described modifier is latex, the solid content of latex is 20wt%～40wt%.
3. according to invert mud claimed in claim 2, it is characterized in that: described latex is one or more in Heveatex, styrene-butadiene latex, NBR latex, polychloroprene latex, polystyrene latex or polybutadiene latex.
4. according to invert mud claimed in claim 1, it is characterized in that: additive, in profit base fluid quality, comprises following component:
(1) emulsifying agent: 0～3%
(2) organoclay: 1～3%
(3) properties modifier: 1～5%.
5. according to invert mud claimed in claim 1, it is characterized in that: in drilling fluid, also add heavy weight additive, make drilling fluid density reach 1.50～2.10g/cm3。
6. according to invert mud claimed in claim 4, it is characterized in that: described emulsifying agent is higher fatty acid amide series of surfactants, as one or more in lauroyl diethanolamine, oleamide, oleoyl diethanol amine, cocounut oil acyl diethanol amine; Also can be polyoxyethylene carboxylate series, as one or more in rosin acid polyoxyethylene ester, polyoxyethylene oleic acid ester, polyoxyethylene stearic acid ester.
7. according to invert mud claimed in claim 4, it is characterized in that: described properties modifier comprises high softening point bitumen composition grain and promoter, wherein high softening point bitumen composition grain addition accounts for 1% ~ 5% of drilling fluid gross mass; High softening point bitumen composition grain by mass percentage, comprises following component: (1) basic asphalt 50wt%～80wt%; (2) rubber powder particle 20wt%～50wt%.
8. according to invert mud claimed in claim 7, it is characterized in that: the average grain diameter of described bituminous composition particle is for being less than 60 orders.
9. according to invert mud claimed in claim 7, it is characterized in that: described basic asphalt is high softening point bitumen, its softening point is 120 ~ 220 DEG C.
10. according to invert mud claimed in claim 7, it is characterized in that: taking bituminous composition particle weight as benchmark, promoter addition is 1～10 weight portion, wherein promoter is one or more in sulfate, quaternary ammonium salt or lignosulfonates, and wherein sulfate is one or more in modification bay alcohol radical sodium sulphate, secondary alcohol groups sodium sulphate and mixed fatty alcohol sodium sulphate etc.; Quaternary ammonium salt is one or more in DTAC, hexadecyltrimethylammonium chloride, OTAC etc.; Lignosulfonates are sodium lignin sulfonate or calcium lignosulfonate.
11. 1 kinds of invert mud preparation methods, is characterized in that: comprise following process:
(1) prepare high softening point bitumen composition grain;
(2) prepare drilling fluid: first measure base oil by required oil-water ratio, pack in the container with agitating device, add emulsifying agent, stir at normal temperatures 15～20 minutes, add organoclay, stir 5～10 minutes, after latex and calcium chloride water are mixed in required ratio, mixed liquor is squeezed in oil phase with high-pressure injection rifle, constantly stir squeezing in process still, then add high softening point bitumen composition grain, continue to stir 20～40 minutes, add heavy weight additive, drilling fluid density is adjusted to desired value, stir 10～20 minutes, obtain stable invert oil-emulsion drilling fluid.
12. according to the invert mud preparation method described in claim 11, it is characterized in that: in above-mentioned preparation process (1), the preparation process of high softening point bitumen composition grain is as follows:
High softening point bitumen is heated to molten state, evenly be sprayed onto on preheated rubber powder particle, leave standstill infiltration a period of time, after freezing, in vibratory sieve, vibrate pulverizing, wherein vibratory sieve sieve aperture is for being greater than 60 mesh standard sieves, and lower part of screen is divided and is the bituminous composition particle obtaining.
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| CN108117863B (en) * | 2016-11-28 | 2020-08-11 | 中国石油化工股份有限公司 | Water-in-oil drilling fluid and preparation method thereof |
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| CN108690580A (en) * | 2017-04-10 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of Water-In-Oil base drilling fluid and preparation method thereof |
| CN108690580B (en) * | 2017-04-10 | 2020-11-06 | 中国石油化工股份有限公司 | Water-in-oil base drilling fluid and preparation method thereof |
| CN108361059A (en) * | 2018-02-09 | 2018-08-03 | 辽宁工程技术大学 | The compound surfactant and its method of modifying of modified hyposmosis coal seam reservoirs |
| CN108361059B (en) * | 2018-02-09 | 2019-07-23 | 辽宁工程技术大学 | The compound surfactant and its method of modifying of modified hyposmosis coal seam reservoirs |
| CN108384519A (en) * | 2018-04-24 | 2018-08-10 | 中国石油集团渤海钻探工程有限公司 | A kind of drilling fluid latex class lubricating collapse-resisting agent |
| CN110804426A (en) * | 2019-11-15 | 2020-02-18 | 中国石油集团渤海钻探工程有限公司 | Synthetic base drilling fluid and preparation method thereof |
| CN110804426B (en) * | 2019-11-15 | 2021-11-23 | 中国石油集团渤海钻探工程有限公司 | Synthetic base drilling fluid and preparation method thereof |
| CN117757445A (en) * | 2024-02-22 | 2024-03-26 | 克拉玛依市义恩技术服务有限责任公司 | fluid loss additive for asphalt-based drilling fluid and preparation method thereof |
| CN117757445B (en) * | 2024-02-22 | 2024-04-30 | 克拉玛依市义恩技术服务有限责任公司 | Fluid loss additive for asphalt-based drilling fluid and preparation method thereof |
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