CN102775970A - Weak-gel synthetic drilling fluid and preparation method thereof - Google Patents
Weak-gel synthetic drilling fluid and preparation method thereof Download PDFInfo
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- CN102775970A CN102775970A CN2012102420709A CN201210242070A CN102775970A CN 102775970 A CN102775970 A CN 102775970A CN 2012102420709 A CN2012102420709 A CN 2012102420709A CN 201210242070 A CN201210242070 A CN 201210242070A CN 102775970 A CN102775970 A CN 102775970A
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Abstract
The invention discloses a weak-gel synthetic drilling fluid, which comprises 60-95 parts by volume of gas oil synthetic base liquid, 5-40 parts by volume of calcium chloride watery solution of which the mass fraction is 25-35%, as well as 1.0-3.5% of organic soil, 0.5-4.0% of primary emulsifier, 0.5-3.5% of auxiliary emulsifier, 0.5-3.5% of calcium oxide, 0.5-2.5% of wetting agent, 1.0-4.0% of filtrate reducer, 20-100% of weighting agent and 0.3-1.5% of optional activating agent according to a mass-volume ratio based on total volume fractions of the gas oil synthetic base liquid and the calcium chloride watery solution. The drilling fluid disclosed by the invention has the advantages as follows: (1) the synthetic drilling fluid has good thixotropy, and high low-shear rate viscosity, and (2) the plastic viscosity of the drilling liquid is smaller than that of the traditional drilling liquid.
Description
Technical field
The present invention relates to a kind of drilling fluid, particularly a kind of weak gel synthetic base drilling fluid and preparation method thereof.
Background technology
For creeping into of long horizontal traverse well, extended reach well and horizontal well, when using traditional water-base drilling fluid to creep into,, cause near the borehole wall, forming a large amount of cutting beds because drilling fluid suspends and to carry drilling cuttings indifferent; If use when carrying the strong water-base drilling fluid of drilling cuttings ability and creeping into, though solved the sand problem of taking, compare with oil base drilling fluid, but exist frictional resistance greatly, problem such as the difficulty that makes a trip; Traditional oil base and synthetic base drilling fluid, though inhibition and oilness are good, its low-shear rate viscosity is less, suspend and carry the drilling cuttings ability relatively a little less than.
Therefore, be necessary to provide a kind of and can satisfy the synthetic base drilling fluid that long horizontal traverse well, extended reach well and horizontal well creep into demand.
Summary of the invention
The invention discloses a kind of weak gel synthetic base drilling fluid with good thixotropic property, this drilling fluid has very high low-shear rate viscosity.Use this kind drilling fluid when long horizontal traverse well, extended reach well and horizontal well creep into; Because the ability that it has very strong suspension and carries drilling cuttings; Therefore near the borehole wall, be not easy to form cutting bed, make and to carry out smoothly in long horizontal traverse well, extended reach well and horizontal well drilling operation.
The disclosed weak gel synthetic base drilling fluid of the present invention comprises following component:
Gas system oil synthetic base base fluid: 60～95 parts by volume;
Massfraction is 25～35% calcium chloride water: 5～40 parts by volume; And
Based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio,
Organophilic clay: 1.0～3.5%;
Primary emulsion: 0.5～4.0%;
Auxilliary emulsifying agent: 0.5～3.5%;
Quicklime: 0.5～3.5%;
Wetting agent: 0.5～2.5%;
Fluid loss agent: 1.0～4.0%;
Weighting agent: 20～100%.
Wherein, Said " mass volume ratio " is meant the percent value of TV of quality and the said gas system oil synthetic base base fluid and the said calcium chloride water of other component; Wherein when the quality of other component with " g " during as unit, the unit of corresponding volume is " ml ".
The quality of other component outside degasification system oil synthetic base base fluid and the calcium chloride water is calculated through following formula:
The mass M of other component
Other component=(V
Synthetic base fluid+ V
Calcium chloride waterThe mass volume ratio of) * each component;
Wherein: M
Other componentThe quality of-other component, g;
V
Synthetic base fluidThe volume of-synthetic base fluid, ml;
V
Calcium chloride waterThe volume of-calcium chloride water, ml;
In the composition in weak gel synthetic base drilling fluid of the present invention, gas system oil synthetic base base fluid is under the HTHP condition, catalyzer such as adding iron, cobalt, nickel, the hydrocarbon compound that is polymerized through Fischer-Tropsch method by Sweet natural gas.The content of gas system oil synthetic base base fluid can be 60～95 parts by volume, preferred 70～90 parts.
In the composition in weak gel synthetic base drilling fluid of the present invention, massfraction is that 25～35% calcium chloride water is meant that 25～35g calcium chloride is dissolved in formed solution in 75～65g water.The content of this calcium chloride water can be 5～40 parts by volume, preferred 10～30 parts.
In the composition in weak gel synthetic base drilling fluid of the present invention, organophilic clay is meant that sodium bentonite is through belt length chain (C
12～C
30) the alkyl quaternary ammonium salts modification after soil.Preferably, organophilic clay can be the organophilic clay PF-MOGEL that COSL (hereinafter to be referred as COSL) produces.The content of organophilic clay can be based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio, and 1.0～3.5%, preferred 1.0～3.0%, more preferably 1.5～3.0%.
In the composition in weak gel synthetic base drilling fluid of the present invention; Primary emulsion is by long chain fatty acid, alkyl benzene calcium sulfonate, propylene oxide and 1; The reaction product of 4-tetramethylenediamine forms by 3: 1: 1～4: 3: 2 mixed, and wherein long chain fatty acid is selected from LAURIC ACID 99 MIN, tetradecanoic acid, palmitinic acid, Triple Pressed Stearic Acid, oleic acid, linolic acid, Yatall MA and composition thereof; 1, the reaction product of 4-tetramethylenediamine and propylene oxide has about molecular weight of 2500 to 3000 usually.Preferably; Primary emulsion can be the PF-MOEMUL-P that COSL produces; PF-MOEMUL-P is by Yatall MA, calcium dodecylbenzene sulphonate, propylene oxide and 1, and to be about 2700～2900 polymkeric substance mix by 3: 2: 1 mass ratio the molecular weight that 4-tetramethylenediamine reaction back generates.The content of primary emulsion can be based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio, and 0.5～4.0%, preferred 0.5～2.5%, more preferably 0.8～1.5%.
In the composition in weak gel synthetic base drilling fluid of the present invention, auxilliary emulsifying agent is to be mixed by 2: 1: 1～3: 2: 1 mass ratio by petroleum sodium sulfonate, sodium alkyl benzene sulfonate, tween 80.Preferably, auxilliary emulsifying agent can be the PF-MOCOAT that COSL produces, and PF-MOCOAT is mixed by 3: 2: 1 mass ratio by petroleum sodium sulfonate, X 2073, tween 80.The TV umber that the content of auxilliary emulsifying agent can be based on said gas system oil synthetic base base fluid and said calcium chloride water is by mass volume ratio, and 0.5～3.5%, preferred 0.5～2.5%, more preferably 1.5～2.2%.
In the composition in weak gel synthetic base drilling fluid of the present invention; The content of quicklime can be based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio; 0.5～3.5%, preferred 1.5～3.5%, more preferably 2.0～3.0%.
In the composition in weak gel synthetic base drilling fluid of the present invention, wetting agent is to be mixed by three kinds in polyoxypropylene butyl ether, Yelkin TTS, fatty acid methyl ester or the fatty-acid ethyl ester mass ratios by 1: 2: 1 or 3: 2: 1.Preferably, wetting agent can be the PF-MOWET that COSL produces, and PF-MOWET is mixed by 1: 2: 1 mass ratio by polyoxypropylene butyl ether, Yelkin TTS, OE.The content of wetting agent can be said gas system oil synthetic base base fluid and said calcium chloride water the TV umber by quality and than, 0.5～2.5%, preferred 0.5～2.0%, more preferably 0.8～2.0%.
In the composition in weak gel synthetic base drilling fluid of the present invention, fluid loss agent react the mixture that the oxidized bitumen of back generation is formed by 8: 1: 24～16: 1: 24 mass ratio by modifying asphalt resin, organo-silicone rubber powder and softening temperature at 80 ℃～120 ℃ pitch under 200 ℃～280 ℃ conditions.Preferably; Fluid loss agent can be the PF-MOHFL that COSL produces, and PF-MOHFL is, and to be 115 ℃ the pitch oxidized bitumen that under 260 ℃～280 ℃ conditions, react the back generation by modifying asphalt resin, organo-silicone rubber powder and softening temperature mix by 8: 1: 24 mass ratio.Preferably, the content of fluid loss agent can be based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio, and 1.0～4.0%, preferred 2～4%, more preferably 2.5～3.5%.
In the composition in weak gel synthetic base drilling fluid of the present invention, the preferred tiff of weighting agent, Wingdale or iron ore.The content of weighting agent confirmed by the density of drilling fluid, and the TV umber that generally can be based on said gas system oil synthetic base base fluid and said calcium chloride water is by mass volume ratio, 20～100%, preferred 32～90%.
In the composition in weak gel synthetic base drilling fluid of the present invention, can comprise also preferably that activation is carried to cut agent.Activation is carried and cut agent is under protection of nitrogen gas, to have a non-linear cancellated high molecular polymer through what polycondensation formed by organic acid and organic amine.Wherein organic acid is selected from Succinic Acid, tartrate, pentanedioic acid, hexanodioic acid, Hydrocerol A and composition thereof; Organic amine is selected from quadrol, tn, tetramethylenediamine, hexanediamine, diethylenetriamine, triethylene tetramine, TEPA and composition thereof.Preferably; Activation is carried and cut agent is under protection of nitrogen gas, to have a non-linear cancellated high molecular polymer through what polycondensation formed by a kind of in a kind of and triethylene tetramine in tartrate, hexanodioic acid, the Hydrocerol A or the TEPA, and molecular weight is about 40000～90000.More preferably, activation is carried and is cut the PF-MOVIS that agent can be the production of Guangdong Kai Pinglian skill chemical industry ltd.PF-MOVIS preferably has a non-linear cancellated high molecular polymer through what polycondensation formed by hexanodioic acid and triethylene tetramine under protection of nitrogen gas, molecular weight is about 87000; Or under protection of nitrogen gas, having a non-linear cancellated high molecular polymer through what polycondensation formed by tartrate and triethylene tetramine, molecular weight is about 85000.Activation is carried TV umber that the content of cutting agent can be based on said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio, and 0.3～1.5%, preferred 0.3～1.2%, more preferably 0.3～1.0%.
The advantage of weak gel synthetic base drilling fluid of the present invention is: this drilling fluid is except the advantage with traditional oil base, synthetic base drilling fluid; Also have the following advantages: the thixotropy of (1) drilling fluid is good; Promptly this drilling fluid has very high low-shear rate viscosity (LSRV), LSRV >=80000mPa.s of 0.3RPM; (2) drilling fluid PV (PV) is littler than the PV of traditional oil base drilling fluid; (3) drilling speed of drilling fluid is high.
The invention also discloses a kind of method for preparing weak gel synthetic base drilling fluid of the present invention, comprising: the organophilic clay that in synthetic base fluid, adds aequum for example PF-MOGEL is carried out middling speed and is stirred; The primary emulsion that adds aequum then for example PF-MOEMUL-P, auxilliary emulsifying agent for example PF-MOCOAT carry out high-speed stirring; Under the condition of high-speed stirring, add the calcium chloride water of aequum then, carry out high-speed stirring; The quicklime that adds aequum then carries out high-speed stirring; The wetting agent that adds aequum then for example PF-MOWET carries out high-speed stirring; The fluid loss agent that adds aequum then for example PF-MOHFL carries out high-speed stirring; The weighting agent that adds aequum then for example tiff transfers to about 1.10g/cm to drilling fluid density
3～1.80g/cm
3, carry out high-speed stirring, aging in the digestion tank of packing at last.Obtain drilling fluid of the present invention.
The invention also discloses a kind of method for preparing weak gel synthetic base drilling fluid of the present invention, comprising: the organophilic clay that in synthetic base fluid, adds aequum for example PF-MOGEL is carried out middling speed and is stirred; The primary emulsion that adds aequum then for example PF-MOEMUL-P, auxilliary emulsifying agent for example PF-MOCOAT carry out high-speed stirring; Under the condition of high-speed stirring, add the calcium chloride water of aequum then, carry out high-speed stirring; The quicklime that adds aequum then carries out high-speed stirring; The wetting agent that adds aequum then for example PF-MOWET carries out high-speed stirring; The fluid loss agent that adds aequum then for example PF-MOHFL carries out high-speed stirring; The activation that adds aequum then carry cut agent for example PF-MOVIS carry out high-speed stirring; The weighting agent that adds aequum then for example tiff transfers to about 1.10g/cm to drilling fluid density
3～1.80g/cm
3, carry out high-speed stirring, aging in the digestion tank of packing at last.Obtain drilling fluid of the present invention.
Embodiment
The preparation of drilling fluid
Employed organophilic clay is PF-MOGEL among the embodiment, is provided by COSL; Primary emulsion is PF-MOEMUL-P, is provided by COSL; Auxilliary emulsifying agent PF-MOCOAT is provided by COSL; Wetting agent is PF-MOWET, is provided by COSL; Fluid loss agent is PF-MOHFL, is provided by COSL.
Embodiment 1
A. fill a prescription:
Gas system oil: 70 parts;
Massfraction is 30% calcium chloride water: 30 parts; And
TV umber (100 parts) based on gas system oil and calcium chloride water is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：1.0％；
PF-MOCOAT：1.5％；
Quicklime: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
Weighting agent: tiff 32.5%.
B. blending process: the PF-MOGEL middling speed that in the gas system oil of said volume parts, adds said mass volume ratio stirs 8min, adds PF-MOEMUL-P, the PF-MOCOAT high-speed stirring 2min of said mass volume ratio; The massfraction that under the condition of high-speed stirring, adds said volume parts is 30% calcium chloride water, high-speed stirring 20min; The quicklime high-speed stirring 5min that adds said mass volume ratio; The PF-MOWET high-speed stirring 5min that adds said mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds said mass volume ratio; The tiff that adds said mass volume ratio transfers to 1.2g/cm to drilling fluid density
3, high-speed stirring 20min, in the digestion tank of packing in 100 ℃ of aging 16h.Obtain drilling fluid.
Embodiment 2
A. fill a prescription:
Gas system oil: 70 parts;
Massfraction is 30% calcium chloride water: 30 parts; And
TV umber (100 parts) based on gas system oil and calcium chloride water is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：1.0％；
PF-MOCOAT：1.5％；
Quicklime: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
PF-MOVIS:0.3% (under protection of nitrogen gas, have a non-linear cancellated high molecular polymer through what polycondensation formed by hexanodioic acid and triethylene tetramine, molecular weight is 87000, and Kai Pinglian skill chemical industry ltd provides by Guangdong);
Weighting agent: tiff 32.5%.
B. blending process: the PF-MOGEL middling speed that in the gas system oil of said volume parts, adds said mass volume ratio stirs 8min, adds PF-MOEMUL-P, the PF-MOCOAT high-speed stirring 2min of said mass volume ratio; The massfraction that under the condition of high-speed stirring, adds said volume parts is 30% calcium chloride water, high-speed stirring 20min; The quicklime high-speed stirring 5min that adds said mass volume ratio; The PF-MOWET high-speed stirring 5min that adds said mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds said mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds said mass volume ratio; The tiff that adds said mass volume ratio transfers to 1.2g/cm to drilling fluid density
3, high-speed stirring 20min, in the digestion tank of packing in 100 ℃ of aging 16h.
Embodiment 3
A. fill a prescription:
Gas system oil: 80 parts;
Massfraction is 25% calcium chloride water: 20 parts; And
TV umber (100 parts) based on gas system oil and calcium chloride water is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：0.8％；
PF-MOCOAT：1.8％；
Quicklime: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
Weighting agent: tiff 32.5%.
B. blending process: the PF-MOGEL middling speed that in the gas system oil of said volume parts, adds said mass volume ratio stirs 8min, adds the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of said mass volume ratio, said mass volume ratio; The massfraction that under the condition of high-speed stirring, adds said volume parts is 25% calcium chloride water, high-speed stirring 20min; The quicklime high-speed stirring 5min that adds said mass volume ratio; The PF-MOWET high-speed stirring 5min that adds said mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds said mass volume ratio; The tiff that adds said mass volume ratio transfers to 1.2g/cm to drilling fluid density
3, high-speed stirring 20min, in the digestion tank of packing in 100 ℃ of aging 16h.Obtain drilling fluid.
Embodiment 4
A. fill a prescription:
Gas system oil: 80 parts;
Massfraction is 25% calcium chloride water: 20 parts; And
TV umber (100 parts) based on gas system oil and calcium chloride water is each component of following mass volume ratio:
PF-MOGEL：1.5％；
PF-MOEMUL-P：0.8％；
PF-MOCOAT：1.8％；
Quicklime: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
PF-MOVIS:0.5% (under protection of nitrogen gas, have a non-linear cancellated high molecular polymer through what polycondensation formed by tartrate and triethylene tetramine, molecular weight is 85000, and Kai Pinglian skill chemical industry ltd provides by Guangdong);
Weighting agent: tiff 32.5%.
B. blending process: the PF-MOGEL middling speed that in the gas system oil of said volume parts, adds said mass volume ratio stirs 8min, adds the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of said mass volume ratio, said mass volume ratio; The massfraction that under the condition of high-speed stirring, adds said volume parts is 25% calcium chloride water, high-speed stirring 20min; The quicklime high-speed stirring 5min that adds said mass volume ratio; The PF-MOWET high-speed stirring 5min that adds said mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds said mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds said mass volume ratio; The tiff that adds said mass volume ratio transfers to 1.2g/cm to drilling fluid density
3, high-speed stirring 20min, in the digestion tank of packing in 100 ℃ of aging 16h.Obtain drilling fluid.
Embodiment 5
A. fill a prescription:
Gas system oil: 90 parts;
Massfraction is 35% calcium chloride water: 10 parts; And
TV umber (100 parts) based on gas system oil and calcium chloride water is each component of following mass volume ratio:
PF-MOGEL：3.0％；
PF-MOEMUL-P：1.5％；
PF-MOCOAT：2.2％；
Quicklime: 3.0%;
PF-MOWET：1.5％；
PF-MOHFL：3.0％；
PF-MOVIS:0.9% (under protection of nitrogen gas, have a non-linear cancellated high molecular polymer through what polycondensation formed by hexanodioic acid and triethylene tetramine, molecular weight is 87000, and Kai Pinglian skill chemical industry ltd provides by Guangdong);
Weighting agent: tiff 81.5%.
B. blending process: the PF-MOGEL middling speed that in the gas system oil of said volume parts, adds said mass volume ratio stirs 8min, adds the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of said mass volume ratio, said mass volume ratio; The massfraction that under the condition of high-speed stirring, adds said volume parts is 35% calcium chloride water, high-speed stirring 20min; The quicklime high-speed stirring 5min that adds said mass volume ratio; The PF-MOWET high-speed stirring 5min that adds said mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds said mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds said mass volume ratio; The tiff that adds said mass volume ratio transfers to 1.5g/cm to drilling fluid density
3, high-speed stirring 20min, in the digestion tank of packing in 150 ℃ of aging 16h.Obtain drilling fluid.
The performance test of drilling fluid
To the drilling fluid of embodiment 1-5 under 65.5 ℃
ES (VB), LSRV test, and have also tested the FL of the drilling fluid of embodiment 1-5 simultaneously
HTHP(high temperature and high pre ssure filtration), and calculated AV (AV), PV (PV), YP (yield value), the wherein FL of embodiment 1-4 of drilling fluid
HTHPProbe temperature is 100 ℃, the FL of embodiment 5
HTHPProbe temperature is 150 ℃, and test result is seen table 1.
Testing tool
A) six fast rotational viscosimeter: Fann-35A, U.S. Fann instrument company produces;
B) low-shear viscosity meter: BROOKFIELD DV-II+ viscometer, U.S. BROOKFIELD company produces, product type LVDV-II+;
C) electrical stability tester: U.S. OFI product, product type: #131-50;
D) high pressure high temperature filter tester: U.S. OFI product, product type: 170/171.
Testing method
Use six fast rotational viscosimeters, at 65.5 ℃ of regulations mensuration drilling fluids of press down SY/T5621
Reading, and calculate its AV, PV, YP; Use the low-shear viscosity meter according to the LSRV of the Q/HS6008-2010 of CNOOC standard test drilling fluid down at 65.5 ℃ at 0.3r/min; Measure the VB of drilling fluid with electrical stability tester; Press the FL of API standard test drilling fluid with high pressure high temperature filter tester
HTHP
The performance of table 1. synthetic base drilling fluid
Can find out from table 1; The low-shear rate viscosity (LSRV) of the gas system oil synthetic base drilling fluid of embodiment 1～5 is all very high; And being added with activation puies forward the low-shear rate viscosity (LSRV) of embodiment 2, embodiment 4 and embodiment 5 drilling fluids of cutting agent and all is higher than 80000mPa.s; The gas system oil synthetic base drilling fluid suspension of these several kinds of different densities is described and is carried the very capable of drilling cuttings, because their PV is little, therefore the raising to ROP has important effect.
It can also be seen that from the test result of table 1; The effect of the drilling fluid of embodiment 2 is superior to not containing the effect of drilling fluid of the embodiment 1 of PF-MOVIS: the LSRV of embodiment 2 is 99876mPa.s; And the LSRV of embodiment 1 is 49316mPa.s; The YP of embodiment 2 and
are all than the height of embodiment 1, and the PV of embodiment 2 is lower than embodiment's 1.
In the test result of table 1; The effect of drilling fluid of embodiment 4 that contains 0.5 part PF-MOVIS and PF-MOGEL content lower (being lower than embodiment 1) is superior to not containing the effect of the drilling fluid of the higher embodiment 3 of PF-MOVIS and PF-MOGEL content: the LSRV of embodiment 4 is up to 89488mPa.s; And the YP of embodiment 4 and
are all than the height of embodiment 3, and the PV of embodiment 4 is lower than embodiment's 3.
The density of embodiment 5 gas system oil synthetic base drilling fluids is 1.5g/cm
3, temperature resistance reaches 150 ℃, and low-shear rate viscosity is explained the ability that this drilling fluid has very strong suspension equally and carries drilling cuttings up to 116000mPa.s under 150 ℃.
Hence one can see that, in drilling fluid, add PF-MOVIS after, can further improve the low-shear rate viscosity of synthetic base drilling fluid, reduce its PV, improve the suspension of drilling fluid and the ability of carrying drilling cuttings, the raising of ROP is had important effect.
Should understand; The foregoing description is merely preferred embodiment of the present invention; Be not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. gel synthetic base drilling fluid a little less than a kind, it comprises following each component:
Gas system oil synthetic base base fluid: 60～95 parts by volume, preferred 70～90 parts;
Massfraction is 25～35% calcium chloride water: 5～40 parts by volume, and preferred 10～30 parts; And
Based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio,
Organophilic clay: 1.0～3.5%, preferred 1.0～3.0%, more preferably 1.5～3.0%;
Primary emulsion: 0.5～4.0%, preferred 0.5～2.5%, more preferably 0.8～1.5%;
Auxilliary emulsifying agent: 0.5～3.5%, preferred 0.5～2.5%, more preferably 1.5～2.2%;
Quicklime: 0.5～3.5%, preferred 1.5～3.5%, more preferably 2.0～3.0%;
Wetting agent: 0.5～2.5%, preferred 0.5～2.0%, more preferably 0.8～2.0%;
Fluid loss agent: 1.0～4.0%, preferred 2～4%, more preferably 2.5～3.5%;
Weighting agent: 20～100%, preferred 32～90%.
2. the weak gel synthetic base drilling fluid described in claim 1; Also comprise: activation is carried and is cut agent; The content of cutting agent is carried in said activation: based on the TV umber of said gas system oil synthetic base base fluid and said calcium chloride water by mass volume ratio; 0.3～1.5%, preferred 0.3～1.2%, more preferably 0.3～1.0%.
3. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said organophilic clay are that sodium bentonite is through belt length chain (C
12～C
30) the alkyl quaternary ammonium salts modification after soil.
4. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said primary emulsion is that the reaction product of 4-tetramethylenediamine forms by 3: 1: 1～4: 3: 2 mixed by long chain fatty acid, alkyl benzene calcium sulfonate, propylene oxide and 1.
5. the weak gel synthetic base drilling fluid described in claim 4, wherein said long chain fatty acid is selected from LAURIC ACID 99 MIN, tetradecanoic acid, palmitinic acid, Triple Pressed Stearic Acid, oleic acid, linolic acid, Yatall MA and composition thereof; Said propylene oxide and 1, the reaction product of 4-tetramethylenediamine has 2500 to 3000 molecular weight.
6. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said auxilliary emulsifying agent is to be formed by 2: 1: 1～3: 2: 1 mixed by petroleum sodium sulfonate, sodium alkyl benzene sulfonate, tween 80.
7. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said wetting agent are to be mixed by three kinds in polyoxypropylene butyl ether, Yelkin TTS, fatty acid methyl ester or the fatty-acid ethyl ester mass ratios by 1: 2: 1 or 3: 2: 1.
8. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said fluid loss agent reacts the mixture that oxidized bitumen that the back generates is formed by 8: 1: 24～16: 1: 24 mass ratio by modifying asphalt resin, organo-silicone rubber powder and softening temperature at 80 ℃～120 ℃ pitch under 200 ℃～280 ℃ conditions.
9. the weak gel synthetic base drilling fluid described in claim 1 or 2, wherein said weighting agent is Wingdale, tiff or iron ore.
10. the weak gel synthetic base drilling fluid described in claim 2; Wherein said activation is carried and cut agent is organic acid and organic amine pass through polycondensation formation under protection of nitrogen gas the non-linear cancellated high molecular polymer that has, and wherein said organic acid is selected from Succinic Acid, tartrate, pentanedioic acid, hexanodioic acid, Hydrocerol A and composition thereof; Said organic amine is selected from quadrol, tn, tetramethylenediamine, hexanediamine, diethylenetriamine, triethylene tetramine, TEPA and composition thereof.
11. a method for preparing among the claim 1-10 each described weak gel synthetic base drilling fluid comprises: in synthetic base fluid, add aequum organophilic clay, carry out middling speed and stir; Add the primary emulsion of aequum then, auxilliary emulsifying agent carries out high-speed stirring; The massfraction that under the condition of high-speed stirring, adds aequum then is 25～35% calcium chloride water, carries out high-speed stirring; The quicklime that adds aequum then carries out high-speed stirring; The wetting agent that adds aequum then carries out high-speed stirring; The fluid loss agent that adds aequum then carries out high-speed stirring; The activation that randomly adds aequum is then carried and is cut agent and carry out high-speed stirring; The weighting agent that adds aequum then transfers to 1.10g/cm with drilling fluid density
3～1.80g/cm
3, carry out high-speed stirring, aging in the digestion tank of packing at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN103710010A (en) * | 2013-12-30 | 2014-04-09 | 安东石油技术（集团）有限公司 | High-temperature resistant oil base drilling fluid system |
| CN103788934A (en) * | 2014-01-20 | 2014-05-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Soil-phase-free oil-based drilling fluid |
| CN104232034A (en) * | 2013-06-09 | 2014-12-24 | 中国石油化工股份有限公司 | A drilling fluid and a method of improving fluid loss reduction performance of the drilling fluid |
| CN104327811A (en) * | 2014-09-18 | 2015-02-04 | 中国石油天然气集团公司 | Environment-friendly high-temperature-resistant gas oil synthetic-based drilling fluid and preparation method and application thereof |
| CN104789196A (en) * | 2015-04-03 | 2015-07-22 | 中国石油大学(北京) | Wetting agent for oil-based drilling fluid and preparation method of wetting agent |
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| CN105086956A (en) * | 2015-08-28 | 2015-11-25 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Tackifier for oil-based drilling fluid and preparation method therefor |
| CN105505347A (en) * | 2014-09-23 | 2016-04-20 | 中国石油化工股份有限公司 | Synthetic base drilling fluid base oil |
| CN105586022A (en) * | 2014-10-22 | 2016-05-18 | 中国石油化工股份有限公司 | Water-in-oil based drilling fluid with high temperature resistance and preparation method thereof |
| CN105586020A (en) * | 2014-10-22 | 2016-05-18 | 中国石油化工股份有限公司 | Whole oil-based drilling fluid and preparation method thereof |
| CN107779182A (en) * | 2016-08-29 | 2018-03-09 | 中国石油化工股份有限公司 | A kind of gas liquefaction synthetic base drilling fluid |
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| CN109971440A (en) * | 2019-04-04 | 2019-07-05 | 中国海洋石油集团有限公司 | A kind of degradable synthetic base drilling fluid of environmental protection and preparation method thereof |
| CN110564387A (en) * | 2019-08-22 | 2019-12-13 | 中国石油集团长城钻探工程有限公司 | ultrahigh-density environment-friendly gas-to-oil synthetic base drilling fluid and preparation method thereof |
| CN110776883A (en) * | 2019-10-29 | 2020-02-11 | 中国海洋石油集团有限公司 | Emulsifier for oil-based drilling fluid |
| CN113801642A (en) * | 2020-06-11 | 2021-12-17 | 中国石油天然气集团有限公司 | Cutting extraction composition, cutting extraction agent, preparation method and application of cutting extraction agent |
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| CN103788934A (en) * | 2014-01-20 | 2014-05-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Soil-phase-free oil-based drilling fluid |
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