CN105086964A - Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir - Google Patents
Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir Download PDFInfo
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Abstract
The present invention discloses a low-toxicity oil base microbubble drilling fluid for protecting a hydrocarbon reservoir. The drilling fluid mainly comprises the following components in parts by weight: 70-95 parts of base oil, 5-30 parts of water, 1-3 parts of an oil base blowing agent, 2-5 parts of organic bentonite, 0.5-2 parts of a tackifier and 1-3 parts of an emulsifier. By adopting a technical solution of using a mixture of the oil base blowing agent, organic bentonite, the tackifier, the base oil, water and air to form oil base microbubbles, the existing problems in the prior art that lower density, limited degree, insufficient temperature and salt resistance capacity in an aqueous foaming system, and complex underground problems of leakage, hole shrinkage and tool jamming easily caused can be solved. The drilling fluid provided by the present invention can be applied to a drilling operation in a special and complex reservoir such as a low-pressure carbonate reservoir, a mud shale reservoir and the like, and has the advantages of low-toxicity and environmental protection.
Description
Technical field:
The present invention relates to a kind of operation liquid in oil drilling engineering, specifically, is a kind of reservoir protec-tion low toxicity oil based micro-foam drilling fluid that can be used for low pressure and leakmess formation, have environmental protection characteristic.
Background technology:
For probing and the exploitation of low pressure reservoir, optimal drilling fluid is foam drilling fluid.As far back as the fifties in last century, just recognize that foam density is little abroad, have stronger removing and cutting carring ability, foam applications can improve rate of penetration in drilling process, reduce bit freezing number of times, reduce drill bit consumption and power demand.The foam drilling fluid of current routine is all take aqueous phase as continuum, rely on the effect of whipping agent, by reducing with air mixed the foam or microvesicle that density formed, as patent CN200410021014.8, CN200410013232.7 and CN200710113558.0 etc., but water-based foam also exists following deficiency:
(1) water-based foam is all take aqueous phase as continuum, and because base fluid density is high, the reduction degree of system density is subject to the restriction of objective condition, and particularly in some low pressure deep-wells areas, drilling fluid stability is subject to larger impact,
(2) stability of water-based foam is destroyed obviously by Saline Water, at low pressure, high saliferous reservoir that water sensitivity is strong, because lather collapse easily causes shale hydration to expand, limits the application of this technology.
Oil base micro-foam drilling fluid technology is emerging drilling technique, has the following advantages:
(1) water content is lower, decreases the concentration of emulsification water droplet in system, can reduce plastic viscosity.
(2) Heat stability is good, is easy to safeguard.
(3) saline-alkaline tolerance is stronger.
(4) compare water-based foam drilling fluid, be more conducive to reservoir protec-tion.
Oil-based foam drilling well is the very potential boring method of one, can solve the challenge such as leakage, slump in, bit freezing due to hydration initiation that conventional water-based foam drilling well runs into.
The range of application of oil base micro-foam drilling fluid:
(1) low pressure, the ultra low pressure formations of energy decline.
(2) water-sensitive strata that smectite content is higher.
(3) high salty formation.
(4) caving ground such as soft, hard brittle shale.
(5) deep drilling that formation temperature is higher.
From existing foam technology development degree, because oil has lower surface tension, itself has certain froth breaking effect to foam, therefore foam generation and stable be the main bugbear that current oil base micro-foam drilling fluid faces.
Summary of the invention:
The technical problem that object of the present invention will solve is the deficiency overcoming existing foam technology; thering is provided a kind of can be applicable in the petroleum drilling operations such as low pressure Carbonate Reservoir, shale reservoir and salt containing layer, has low density, strong rejection capability and the good reservoir protec-tion low toxicity oil based micro-foam drilling fluid of froth stability.
Object of the present invention realizes by following technical measures:
This reservoir protec-tion low toxicity oil based micro-foam drilling fluid comprises the raw material of following weight:
Object of the present invention also realizes by following technical measures:
Described base oil is combined with any proportioning by one or more in the mineral oil (as white oil) of low toxicity, alpha-olefin, makings oil.
Described water is distilled water or not higher than the mineralized water of 10000mg/L salinity.
Described oil base whipping agent is according to chain alkyl fat calcium salt or than chain alkyl fat calcium salt more high valence ion salt: the mixture of alkyl-silicone oil=1:0.2 ~ 0.5 mol ratio mixing.
Described organobentonite is obtained through the modification of Long carbon chain alkyl quaternary ammonium salts by smectite-group clay minerals; In described Long carbon chain alkyl quaternary ammonium salts, the carbon number of carbochain is that one or more in C12, C14, C16, C18 combine with any proportioning.
Described tackifier are the thermoplastic polymers containing non-sulfonated; Described non-sulfonated thermoplastic polymer is rubber, one or more in ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex combine with any proportioning; Described rubber is cis-1,4-polybutadiene rubber, one or more in chloroprene rubber, polybutadiene rubber combine with any proportioning.
Described emulsifying agent is sorbitan fatty acid ester, one or more in Long carbon chain fatty acid amide, polyolefin carboxylic acid's ester combine with any proportioning; Described Long carbon chain fatty acid amide is according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.1 ~ 1.2 mol ratio, temperature of reaction be 170 DEG C ~ 180 DEG C, the reaction times is amidated products under 6-8 hour condition.
Just each component elaborates below:
(1) base oil
Base oil at oil base micro-foam drilling fluid as external phase, because the bio-toxicity of diesel oil is high, along with the enhancing of environmental protection consciousness, use the mineral oil (as white oil) of low toxicity, synthesis base, as one or more compositions of alpha-olefin, makings wet goods, such base oil aromaticity content is low, to marine organisms low toxicity or nontoxic, can meet site environment and safe handling requirement;
(2) water
A small amount of water as disperse phase, plays the effect of regulation and control action and rheological parameter of mud, can increase system viscosity in oil-based foam system, is conducive to the stability improving foam.Water of the present invention is distilled water or not higher than the mineralized water of 100000mg/L salinity.
(3) oil base whipping agent
Oil base whipping agent is alkyl fatty calcium salt or the more mixture that mixes with certain proportion of high valence ion salt and alkyl-silicone oil of long-chain, and above-mentioned certain proportion refers to: the alkyl fatty calcium salt of long-chain or more high valence ion salt: alkyl-silicone oil=1:0.2 ~ 0.5 mole.
(4) organobentonite
In oil base micro-foam drilling fluid, organophilic clay is mainly used in improving viscosity and shear force, and plays filtrate reducing effect, also helps the stability improving foam.Organobentonite is obtained through surfactant intercalated modifications such as Long carbon chain alkyl quaternary ammonium saltss by smectite-group clay minerals.The carbon number of the carbochain in the alkyl quaternary ammonium salts of above-mentioned Long carbon chain is one or more compositions in C12, C14, C16, C18.
(5) tackifier
Tackifier, for improving drilling fluid viscosity and shear force, can reduce the filter loss of drilling fluid simultaneously, and can improve froth stability.Oil base tackifier commonly used asphalt product as tackifier in the past, easily cause reservoir rocks wettability reversal, because its dosage is up to more than 5 ~ 10%, make drilling fluid plastic viscosity high, cause rate of penetration lower, in order to reduce tackifier dosage, improve rate of penetration, tackifier of the present invention are the thermoplastic polymers containing non-sulfonated.This non-sulfonated thermoplastic polymer can containing one or more following polymers: rubber, ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex etc.Wherein, rubber can contain one or more following polymers: cis-1,4-polybutadiene rubber, chloroprene rubber, polybutadiene rubber.The particle of above-mentioned various rubber is comparatively large, and the dissolution rate in base oil is comparatively slow, in order to improve its dissolution rate, preferably uses its liquid product if possible.
(6) emulsifying agent
In order to make base oil and a small amount of water fully emulsified, form stable water-in-oil emulsion, and prevent water in stratum from immersing in drilling fluid, affect the performance of drilling fluid, need in oil base micro-foam drilling fluid to add a certain amount of emulsifying agent.Can be made up of one or more in sorbitan fatty acid ester, Long carbon chain fatty acid amide, polyolefin carboxylic acid's ester for the emulsifying agent in oil base micro-foam drilling fluid of the present invention.Above-mentioned Long carbon chain fatty acid amide is by naphthenic acid, stearic acid, oleic acid etc. and monoethanolamine, diethanolamine amidated products under certain condition, and this certain condition refers to that the molar ratio of acid and amine is 1:1.1 ~ 1.2, temperature of reaction is 170 DEG C ~ 180 DEG C, reaction times 6-8 hour.
The compound method of reservoir protec-tion low toxicity oil based micro-foam drilling fluid:
Reservoir protec-tion low toxicity oil based micro-foam drilling fluid for following nonlimiting examples is produced by the raw material of following weight and step:
One in the mineral oil (white oil) of a, 70-95 part low toxicity, alpha-olefin or makings oil;
B, 5 ~ 30 parts of distilled water or not higher than the mineralized water of 100000mg/L salinity;
C, the oil base whipping agent of 1.0 ~ 3.0 parts (the alkyl fatty calcium salt of long-chain or more high valence ion salt: alkyl-silicone oil=1:0.2 ~ 0.5 mole);
The organobentonite that the montmorillonite of d, 2-5 part is quaternary ammonium salt-modified;
E, the tackifier of 0.2 ~ 2.0 part (one or more compositions in the thermoplastic polymer of the non-sulfonated such as cis-1,4-polybutadiene rubber, ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex);
F, the emulsifying agent (one or more compositions in sorbitan fatty acid ester, Long carbon chain fatty acid amide, polyolefin carboxylic acid's ester) of 1.0 ~ 3.0 parts;
In jar, add component a, b, f and d successively, heating in water bath is to 50 DEG C, and under 500 ~ 700 turns/min condition, stirring at low speed 20 ~ 30 minutes, adds amount of component b and e afterwards successively, continues stirring 1 ~ 3 hour.
The detection method of reservoir protec-tion low toxicity oil based micro-foam drilling fluid performance:
1, the detection of drilling fluid rheology performance:
Use Fann35A type viscometer to carry out under 50 DEG C of conditions, measure 600r/min successively, the reading of 300r/min, 200r/min, 100r/min, 6r/min, 3r/min is designated as respectively: Φ
600, Φ
300, Φ
200, Φ
100, Φ
6, Φ
3reading, according to following formulae discovery plastic viscosity and yield value:
Plastic viscosity (PV)=Φ
600– Φ
300;
Yield value (YP)=1/2 (Φ
300– PV).
2, the detection of wellbore liquid leaching loss performance:
Use press filtration in drilling fluid to commit a breach of etiquette at room temperature to carry out, the aperture of pressure filter joint is blocked with finger, drilling fluid is poured in pressure filter, make liquid level higher than scale marks in cup and apart from distance from top be l centimetre, put O RunddichtringO well, pave filter paper, tighten bowl cover, then pressure filter is communicated with Y-junction, and measuring graduates is placed on below press filtration instrument spout.Rapid pressurization timing, institute's plus-pressure is 0.7MPa.Pressure source can use nitrogen, carbon dioxide or pressurized gas, forbidding oxygen.When the time that leaches by 30 minutes time, the residual drop on filtration device spout is collected in graduated cylinder, removes graduated cylinder, read and record the volume (unit is mL) of gathered filtrate.
3, the detection of drilling fluid stability:
The probe of electrical stability tester is placed in the glass beaker filling drilling fluid, record and obtain the mean value (emulsion-breaking voltage value, Es) of twice measuring result, the difference reading value for twice must not more than 5%.
4, the detection of drilling fluid high temperature resistant property:
Drilling fluid is poured in high temperature ageing tank, aging 16h under certain hot conditions, tests the performance such as rheological property and filter loss of drilling fluid afterwards, by with high temperature ageing before the contrast of performance, carry out the high temperature resistance stability of appraisal drilling liquid.
5, the mensuration of reservoir protection performance:
Instrument adopts multi-functional pressure core flow tester and rock core to pollute experiment instrument, and concrete steps are: found time by synthetic core saturated, measure the original oil phase permeability K of rock core
0; Then carry out reverse rock core with the drilling fluid prepared in advance dynamically to pollute (condition: temperature 120 DEG C, pressure reduction 3.5MPa, time 2 h); Finally measure the rock core permeability to oil K after polluting
d, and calculate core permeability recovery value K
d/ K
0.
As follows to the performance evaluation of reservoir protec-tion low toxicity oil based micro-foam drilling fluid:
1, drilling fluid fundamental property is evaluated
Measure the performance measurements such as reservoir protec-tion low toxicity oil based micro-foam drilling fluid (with slurry with the distilled water) rheological property at 50 DEG C, filter loss and froth stability and the results are shown in following table 1.
The fundamental property of table 1 reservoir protec-tion low toxicity oil based micro-foam drilling fluid
As shown in Table 1, reservoir protec-tion low toxicity oil based micro-foam drilling fluid rheological is good, and plastic viscosity is low, is conducive to improving rate of penetration; Drilling fluid filtration is lower, its API filtration≤5ml; Emulsion-breaking voltage is at more than 500v; Particularly have good whipability, foam stabilization, the transformation period is more than 1 hour.
2, drilling fluid heat-resisting property is evaluated
Sampling respectively at different temperatures heat roll 16h, then measure rheological property, API filtration and froth stability at 50 DEG C.
The performance of table 2 reservoir protec-tion low toxicity oil based micro-foam drilling fluid after differing temps heat is rolled
As shown in Table 2, reservoir protec-tion low toxicity oil based micro-foam drilling fluid heat-resisting property is good, and after aging within the scope of 100 ~ 120 DEG C, the rheological property of system, API filtration and froth stability all change not quite.
3, reservoir protection performance is evaluated
Sampling evaluates its reservoir protection performance with reference to China National Petroleum industry standard SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ".Experiment records sample core permeability recovery value K
d/ K
0be respectively 90.2%, 89.3%, 92.7%, its permeability resume figure, all more than 85%, shows that the reservoir protection of drilling fluid system is respond well.
Advantage of the present invention is:
(1) base fluid is oil base and non-water based, ensure that the low density of foam system;
(2) rheological is good, and plastic viscosity is low;
(3) froth stability is good, and the transformation period is longer, can reach more than 1 hour;
(4) heat-resisting property is good, and temperature resistance can reach 120 DEG C;
(5) anti-salt pollution capacity is strong, can tolerate 10% sodium chloride salt water pollutions;
(6) have good dehydration building capacity, API filtration is lower than 5ml;
(7) reservoir protection is effective, and permeability resume figure is more than 85%;
(8) adopt low toxicity mineral oil as base oil, be conducive to environmental protection.
Reservoir protec-tion low toxicity oil based micro-foam drilling fluid of the present invention has the advantages such as low density, strong rejection capability and good reservoir protection effect, can be applicable in the drilling operations such as low pressure Carbonate Reservoir, shale reservoir and salt containing layer.
The present invention, by adopting low toxicity base oil, has very strong inhibition, is being applied to oil layer protection Be very effective in low-pressure drilling process especially;
The present invention select oil base whipping agent be long-chain alkyl fatty calcium salt or more high valence ion salt and alkyl-silicone oil composition, oil/air surface tension force can be reduced, be conducive to the generation of oil-based foam, fundamentally reduce drilling fluid density, simultaneously long-chain alkyl fatty calcium salt or more high valence ion salt also there is good emulsifying performance, the emulsifying effectiveness of meeting highly mineralized formation brines is obvious, can form oil base microvesicle by emulsification local water while not affecting foaming properties.
Organobentonite solid particulate in the present invention and tackifier all have satisfactory stability effect to the oil-based foam system formed, and make foam system more stable,
Experiment finds, at mineralized water content 5%-15% (parts by weight), under the condition of below salinity 100000mg/L, can form density 0.45g/cm
3-0.95g/cm
3oil base microvesicle, more than 120 minutes transformation period, there is good oil layer protection effect.
Embodiment:
Below by embodiment, the present invention will be further described, but do not limit the present invention.Raw materials usedly be the art common used material.
Embodiment 1:
Get 70 kilograms of white oils and 30 kilograms of distilled water, adding 1 kilogram of sorbitan fatty acid ester emulsifying agent and 5 kilograms by the carbon number of smectite-group clay minerals carbochain in Long carbon chain alkyl quaternary ammonium salts is the organobentonite that C12 modification obtains, stir 20-30 minute, be made into base slurry; Then add the oil base whipping agent (according to chain alkyl fat calcium salt: the mixture that alkyl-silicone oil=1:0.2 mol ratio mixes) of 1 kilogram and the cis-1,4-polybutadiene rubber tackifier of 2 kilograms, fully stir 2-3 little even up to system.
Embodiment 2:
Get 95 kilograms of white oils and 5 kilograms of distilled water, adding 3 kilograms of sorbitan fatty acid ester emulsifying agents and 2 kilograms by the carbon number of smectite-group clay minerals carbochain in Long carbon chain alkyl quaternary ammonium salts is the organobentonite that C12 modification obtains, stir 20-30 minute, be made into base slurry; Then add the oil base whipping agent (according to chain alkyl fat calcium salt: the mixture that alkyl-silicone oil=1:0.2 mol ratio mixes) of 3 kilograms and the cis-1,4-polybutadiene rubber tackifier of 0.5 kilogram, fully stir 2-3 little even up to system.
Embodiment 3:
Get 80 kilograms of white oils and 20 kilograms of distilled water, adding 2 kilograms of sorbitan fatty acid ester emulsifying agents and 3.5 kilograms by the carbon number of smectite-group clay minerals carbochain in Long carbon chain alkyl quaternary ammonium salts is the organobentonite that C12 modification obtains, stir 20-30 minute, be made into base slurry; Then add the oil base whipping agent (according to chain alkyl fat calcium salt: the mixture that alkyl-silicone oil=1:0.2 mol ratio mixes) of 2 kilograms and the cis-1,4-polybutadiene rubber tackifier of 1 kilogram, fully stir 2-3 little even up to system.
Embodiment 4:
Replace oil base whipping agent (according to chain alkyl fat calcium salt: the mixture that alkyl-silicone oil=1:0.2 mol ratio mixes) with oil base whipping agent (according to chain alkyl fat calcium salt: the mixture that alkyl-silicone oil=1:0.5 mol ratio mixes), other is respectively with embodiment 1-3.
Embodiment 5:
With than chain alkyl fat calcium salt more high valence ion salt replace chain alkyl fat calcium salt, other is respectively with embodiment 1-4.
Embodiment 6:
Replace distilled water with the mineralized water not higher than 10000mg/L salinity, other is respectively with embodiment 1-5.
Embodiment 7:
Replace white oil with alpha-olefin or makings oil, other is respectively with embodiment 1-6.
Embodiment 8:
Replace white oil with the mixture that white oil, alpha-olefin, makings oil any two or three mix with any proportioning, other is respectively with embodiment 1-7.
Embodiment 9:
Be that C14, C16 or C18 replace the carbon number of carbochain in Long carbon chain alkyl quaternary ammonium salts to be C12 with the carbon number of carbochain in Long carbon chain alkyl quaternary ammonium salts, other is respectively with embodiment 1-8.
Embodiment 10:
Be that C12, C14, C16, C18 any two kinds, three kinds or four kinds replace the carbon number of carbochain in Long carbon chain alkyl quaternary ammonium salts for C12 with the mixtures that any proportioning mixes with the carbon number of carbochain in Long carbon chain alkyl quaternary ammonium salts, other is respectively with embodiment 1-9.
Embodiment 11:
Replace cis-1,4-polybutadiene rubber with ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex, chloroprene rubber or polybutadiene rubber, other is respectively with embodiment 1-10.
Embodiment 12:
Replace cis-1,4-polybutadiene rubber with cis-1,4-polybutadiene rubber, ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex any two kinds, three kinds or four kinds of mixtures mixed with any proportioning, other is respectively with embodiment 1-11.
Embodiment 13:
Replace cis-1,4-polybutadiene rubber with the mixture that cis-1,4-polybutadiene rubber, chloroprene rubber, polybutadiene rubber any two or three mix with any proportioning, other is respectively with embodiment 1-11.
Embodiment 14:
With Long carbon chain fatty acid amide (according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.1 mol ratio, temperature of reaction be 180 DEG C, the reaction times is amidated products under 6 hours conditions) or polyolefin carboxylic acid replace sorbitan fatty acid ester, other is respectively with embodiment 1-13.
Embodiment 15:
With sorbitan fatty acid ester, Long carbon chain fatty acid amide (according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.1 mol ratio, temperature of reaction be 180 DEG C, the reaction times is amidated products under 6 hours conditions), the mixture that mixes with any proportioning of polyolefin carboxylic acid any two or three replaces sorbitan fatty acid ester, other is respectively with embodiment 1-13.
Embodiment 16:
With Long carbon chain fatty acid amide (according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.2 mol ratio, temperature of reaction be 170 DEG C, the reaction times is amidated products under 8 hours conditions) replace Long carbon chain fatty acid amide (according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.1 mol ratio, temperature of reaction be 180 DEG C, the reaction times is amidated products under 6 hours conditions), other is respectively with embodiment 14-15.
Embodiment 17:
Preparation density is 0.92g/cm
3reservoir protec-tion low toxicity oil based micro-foam drilling fluid: get the white oil of 950g and the distilled water of 50g with graduated cylinder; add the organobentonite of 10g sorbitan fatty acid ester emulsifying agent and 50g; stir 20 ~ 30 minutes; be made into base slurry; then add whipping agent (according to chain alkyl fat calcium salt: the composition of alkyl-silicone oil=1:0.2 molar combination) and the cis-1,4-polybutadiene rubber tackifier of 20g of 30g, fully stir 2 ~ 3 little even up to system.Measure this system gas release 1200mL, density 0.92g/cm
3, half foam life period 260 minutes.
Embodiment 18:
Preparation density is 0.76g/cm
3reservoir protec-tion low toxicity oil based micro-foam drilling fluid: get the white oil of 900g and the distilled water of 100g; add the organobentonite of 15g sorbitan fatty acid ester emulsifying agent and 40g; stir 20 ~ 30 minutes; be made into base slurry; then add whipping agent (according to chain alkyl fat calcium salt: the composition of alkyl-silicone oil=1:0.2 molar combination) and the cis-1,4-polybutadiene rubber tackifier of 15g of 25g, fully stir 2 ~ 3 little even up to system.Measure this system gas release 1440mL, density 0.76g/cm
3, half foam life period 210 minutes.
Embodiment 19:
Preparation density is 0.57g/cm
3reservoir protec-tion low toxicity oil based micro-foam drilling fluid: get the white oil of 800g and the distilled water of 200g; add the organobentonite of 20g sorbitan fatty acid ester emulsifying agent and 30g; stir 30 ~ 40 minutes; be made into base slurry; then add whipping agent (according to chain alkyl fat calcium salt: the composition of alkyl-silicone oil=1:0.2 molar combination) and the cis-1,4-polybutadiene rubber tackifier of 10g of 20g, fully stir 1 ~ 3 little even up to system.Measure this system gas release 1890mL, density 0.57g/cm
3, half foam life period 180 minutes.
Embodiment 20:
Preparation density is 0.45g/cm
3reservoir protec-tion low toxicity oil based micro-foam drilling fluid: get the white oil of 700g and the distilled water of 300g; add the organobentonite of 30g sorbitan fatty acid ester emulsifying agent and 20g; stir 30 ~ 40 minutes; be made into base slurry; then add whipping agent (according to chain alkyl fat calcium salt: the composition of alkyl-silicone oil=1:0.2 molar combination) and the cis-1,4-polybutadiene rubber tackifier of 5g of 10g, fully stir 1 ~ 2 little even up to system.Measure this system gas release 2370mL, density 0.45g/cm
3, half foam life period 150 minutes.
In sum; these are only better case study on implementation of the present invention; be not intended to limit protection scope of the present invention: therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. reservoir protec-tion low toxicity oil based micro-foam drilling fluid, is characterized in that, this reservoir protec-tion low toxicity oil based micro-foam drilling fluid comprises the raw material of following weight:
2. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described base oil is combined with any proportioning by one or more in the mineral oil of low toxicity, alpha-olefin, makings oil.
3. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described water is distilled water or not higher than the mineralized water of 10000mg/L salinity.
4. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described oil base whipping agent is according to chain alkyl fat calcium salt or more high valence ion salt: the mixture of alkyl-silicone oil=1:0.2 ~ 0.5 mol ratio mixing.
5. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described organobentonite is obtained through the modification of Long carbon chain alkyl quaternary ammonium salts by smectite-group clay minerals.
6. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 5, is characterized in that: in described Long carbon chain alkyl quaternary ammonium salts, the carbon number of carbochain is that one or more in C12, C14, C16, C18 combine with any proportioning.
7. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described tackifier are the thermoplastic polymers containing non-sulfonated.
8. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 7, is characterized in that: described non-sulfonated thermoplastic polymer is rubber, one or more in ethylene-propylene copolymer, base polyurethane prepolymer for use as, styrene-butadiene latex combine with any proportioning.
9. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 1, is characterized in that: described emulsifying agent is sorbitan fatty acid ester, one or more in Long carbon chain fatty acid amide, polyolefin carboxylic acid's ester combine with any proportioning.
10. reservoir protec-tion low toxicity oil based micro-foam drilling fluid according to claim 9; it is characterized in that: described Long carbon chain fatty acid amide is according to naphthenic acid, stearic acid or oleic acid: monoethanolamine or diethanolamine=1:1.1 ~ 1.2 mol ratio, temperature of reaction be 170 DEG C ~ 180 DEG C, the reaction times is amidated products under 6-8 hour condition.
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| CN114075429A (en) * | 2020-08-20 | 2022-02-22 | 东营麦克卓尔石油化工有限公司 | Gas-to-oil foam drilling fluid and preparation method and application thereof |
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| CN107987809A (en) * | 2016-10-27 | 2018-05-04 | 中国石油化工股份有限公司 | A kind of low solid phase high temperature resistant foam drilling fluid and preparation method thereof |
| CN107729631A (en) * | 2017-09-28 | 2018-02-23 | 中国石油天然气股份有限公司 | Method and device for calculating bottom pressure by using liquid level test data |
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| CN110564384B (en) * | 2019-09-28 | 2021-07-20 | 重庆威能钻井助剂有限公司 | Viscosity improver for oil-based drilling fluid and preparation method thereof |
| CN112877044A (en) * | 2019-11-29 | 2021-06-01 | 中国石油化工股份有限公司 | Foam drilling fluid and preparation method and application thereof |
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| CN114437683B (en) * | 2020-11-03 | 2023-08-11 | 中石化石油工程技术服务有限公司 | High-temperature-resistant oil-based foam drilling fluid and preparation method thereof |
| CN115991979A (en) * | 2021-10-20 | 2023-04-21 | 中国石油化工股份有限公司 | Oil-based foam gel plugging agent for fractured shale, and preparation method and application thereof |
| CN115991979B (en) * | 2021-10-20 | 2023-12-22 | 中国石油化工股份有限公司 | Oil-based foam gel plugging agent for fractured shale, and preparation method and application thereof |
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