CN102775970B - 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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- CN102775970B CN102775970B CN201210242070.9A CN201210242070A CN102775970B CN 102775970 B CN102775970 B CN 102775970B CN 201210242070 A CN201210242070 A CN 201210242070A CN 102775970 B CN102775970 B CN 102775970B
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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, while using traditional water-base drilling fluid to creep into, because drilling fluid suspends and to carry drilling cuttings indifferent, cause forming a large amount of cutting beds at Around A Borehole; When carrying water-base drilling fluid that drilling cuttings ability is strong if use and creeping into, although solved the sand problem of taking, compare with oil base drilling fluid, but have that frictional resistance is large, the problem such as difficult makes a trip; Traditional oil base and synthetic base drilling fluid, although inhibition and oilness are good, its low-shear rate viscosity is less, suspend and carry drilling cuttings ability relatively a little less than.
Therefore, be necessary to provide a kind of and can meet 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 of drilling fluid when long horizontal traverse well, extended reach well and horizontal well creep into, the ability that there is very strong suspension and carry drilling cuttings due to it, therefore at Around A Borehole, be not easy to form cutting bed, make can carry out smoothly at long horizontal traverse well, extended reach well and Horizontal Well Drilling well operations.
Weak gel synthetic base drilling fluid disclosed in this invention, comprises following component:
Gas oil synthetic base base fluid processed: 60～95 parts by volume;
Massfraction is 25～35% calcium chloride water: 5～40 parts by volume; And
Cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water is by mass volume ratio,
Organophilic clay: 1.0～3.5%;
Primary emulsion: 0.5～4.0%;
Auxiliary emulsifying agent: 0.5～3.5%;
Calcium oxide: 0.5～3.5%;
Wetting agent: 0.5～2.5%;
Fluid loss agent: 1.0～4.0%;
Weighting agent: 20～100%.
Wherein, described " mass volume ratio " refers to the percent value of the quality of other component and the cumulative volume of described gas oil synthetic base base fluid processed and described calcium chloride water, wherein when the quality of other component, using " g " during as unit, the unit of corresponding volume is " ml ".
The quality of other component outside degasification oil synthetic base base fluid processed and calcium chloride water is calculated by following formula:
The mass M of other component
other component=(V
synthetic base base fluid+ V
calcium chloride waterthe mass volume ratio of) * each component;
Wherein: M
other componentthe quality of-other component, g;
V
synthetic base base fluidthe volume of-synthetic base base fluid, ml;
V
calcium chloride waterthe volume of-calcium chloride water, ml;
In composition in weak gel synthetic base drilling fluid of the present invention, gas oil synthetic base base fluid processed is under HTHP condition, adds the catalyzer such as iron, cobalt, nickel, the hydrocarbon compound being polymerized by Fischer-Tropsch method by Sweet natural gas.The content of gas oil synthetic base base fluid processed can be 60～95 parts by volume, preferably 70～90 parts.
In composition in weak gel synthetic base drilling fluid of the present invention, the calcium chloride water that massfraction is 25～35% refers to 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, preferably 10～30 parts.
In composition in weak gel synthetic base drilling fluid of the present invention, organophilic clay refers to that sodium bentonite is through band long-chain (C
12～C
30) 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 cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 1.0～3.5%, preferably 1.0～3.0%, more preferably 1.5～3.0%.
In 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-butanediamine mixes in the ratio of 3: 1: 1～4: 3: 2, and wherein long chain fatty acid is selected from lauric acid, tetradecanoic acid, palmitinic acid, stearic acid, oleic acid, linolic acid, Yatall MA and composition thereof; The reaction product of Putriscine and propylene oxide has approximately 2500 to 3000 molecular weight conventionally.Preferably, primary emulsion can be the PF-MOEMUL-P that COSL produces, PF-MOEMUL-P is that to be approximately 2700～2900 polymkeric substance mix by the mass ratio of 3: 2: 1 for the molecular weight that generates after being reacted with Putriscine by Yatall MA, calcium dodecylbenzene sulphonate, propylene oxide.The content of primary emulsion can be cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 0.5～4.0%, preferably 0.5～2.5%, more preferably 0.8～1.5%.
In composition in weak gel synthetic base drilling fluid of the present invention, auxiliary emulsifying agent is to be mixed by the mass ratio of 2: 1: 1～3: 2: 1 by petroleum sodium sulfonate, sodium alkyl benzene sulfonate, tween 80.Preferably, auxiliary emulsifying agent can be the PF-MOCOAT that COSL produces, and PF-MOCOAT is mixed by the mass ratio of 3: 2: 1 by petroleum sodium sulfonate, Sodium dodecylbenzene sulfonate, tween 80.The content of auxiliary emulsifying agent can be cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 0.5～3.5%, preferably 0.5～2.5%, more preferably 1.5～2.2%.
In composition in weak gel synthetic base drilling fluid of the present invention, the content of calcium oxide can be that cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water is by mass volume ratio, 0.5～3.5%, preferably 1.5～3.5%, more preferably 2.0～3.0%.
In composition in weak gel synthetic base drilling fluid of the present invention, wetting agent is that in polyoxypropylene butyl ether, Yelkin TTS, fatty acid methyl ester or fatty-acid ethyl ester the three kinds mass ratios by 1: 2: 1 or 3: 2: 1 mix.Preferably, wetting agent can be the PF-MOWET that COSL produces, and PF-MOWET is mixed by the mass ratio of 1: 2: 1 by polyoxypropylene butyl ether, Yelkin TTS, ethyl oleate.The content of wetting agent can be described gas oil synthetic base base fluid processed and described calcium chloride water cumulative volume umber by quality and than, 0.5～2.5%, preferably 0.5～2.0%, more preferably 0.8～2.0%.
In composition in weak gel synthetic base drilling fluid of the present invention, the mixture that fluid loss agent is comprised of by the mass ratio of 8: 1: 24～16: 1: 24 oxidized bitumen of modifying asphalt resin, organo-silicone rubber powder and softening temperature generation after the pitch of 80 ℃～120 ℃ react under 200 ℃～280 ℃ conditions.Preferably, fluid loss agent can be the PF-MOHFL that COSL produces, and the oxidized bitumen generating after the pitch that PF-MOHFL is is 115 ℃ by modifying asphalt resin, organo-silicone rubber powder and softening temperature reacts under 260 ℃～280 ℃ conditions mixes by the mass ratio of 8: 1: 24.Preferably, the content of fluid loss agent can be cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 1.0～4.0%, preferably 2～4%, more preferably 2.5～3.5%.
In composition in weak gel synthetic base drilling fluid of the present invention, the preferred barite of weighting agent, Wingdale or iron ore.The content of weighting agent determined by the density of drilling fluid, can be generally cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 20～100%, preferably 32～90%.
In composition in weak gel synthetic base drilling fluid of the present invention, preferably also can comprise activating to carry and cut agent.Activation is carried and cut agent is the non-linear cancellated high molecular polymer that has being formed through polycondensation under the protection of nitrogen by organic acid and organic amine.Wherein organic acid is selected from succinic acid, tartrate, pentanedioic acid, hexanodioic acid, citric acid and composition thereof; Organic amine is selected from quadrol, propylene diamine, butanediamine, hexanediamine, diethylenetriamine, triethylene tetramine, tetraethylene pentamine and composition thereof.Preferably; activation is carried and cut agent is that a kind of in a kind of and triethylene tetramine in tartrate, hexanodioic acid, citric acid or tetraethylene pentamine passes through the non-linear cancellated high molecular polymer that has that polycondensation forms under the protection of nitrogen, and molecular weight is approximately 40000～90000.More preferably, to carry and cut agent can be that the PF-MOVIS that lateral skill Chemical Co., Ltd. produces is opened in Guangdong in activation.PF-MOVIS is preferably formed through polycondensation under the protection of nitrogen by hexanodioic acid and triethylene tetramine has non-linear cancellated high molecular polymer, and molecular weight is about 87000; Or by tartrate and triethylene tetramine, under the protection of nitrogen, through polycondensation, formed there is non-linear cancellated high molecular polymer, molecular weight is about 85000.Activation carry the content of cutting agent can be cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water by mass volume ratio, 0.3～1.5%, preferably 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 having the advantage of traditional oil base, synthetic base drilling fluid, also have the following advantages: the thixotropy of (1) drilling fluid is good, this drilling fluid has very high low-shear rate viscosity (LSRV), LSRV >=80000mPa.s of 0.3RPM; (2) drilling fluid plastic viscosity (PV) is less 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 of preparing weak gel synthetic base drilling fluid of the present invention, comprising: the organophilic clay that adds aequum in synthetic base base fluid for example PF-MOGEL is carried out middling speed stirring; Then the primary emulsion that adds aequum for example PF-MOEMUL-P, auxiliary emulsifying agent for example PF-MOCOAT carry out high-speed stirring; Then under the condition of high-speed stirring, add the calcium chloride water of aequum, carry out high-speed stirring; Then add the calcium oxide of aequum to carry out high-speed stirring; Then the wetting agent that adds aequum for example PF-MOWET carries out high-speed stirring; Then the fluid loss agent that adds aequum for example PF-MOHFL carries out high-speed stirring; Then the weighting agent that adds aequum for example barite is adjusted to about 1.10g/cm drilling fluid density
3～1.80g/cm
3, carry out high-speed stirring, finally pack in digestion tank aging.Obtain drilling fluid of the present invention.
The invention also discloses a kind of method of preparing weak gel synthetic base drilling fluid of the present invention, comprising: the organophilic clay that adds aequum in synthetic base base fluid for example PF-MOGEL is carried out middling speed stirring; Then the primary emulsion that adds aequum for example PF-MOEMUL-P, auxiliary emulsifying agent for example PF-MOCOAT carry out high-speed stirring; Then under the condition of high-speed stirring, add the calcium chloride water of aequum, carry out high-speed stirring; Then add the calcium oxide of aequum to carry out high-speed stirring; Then the wetting agent that adds aequum for example PF-MOWET carries out high-speed stirring; Then the fluid loss agent that adds aequum for example PF-MOHFL carries out high-speed stirring; Then add the activation of aequum to carry to cut agent for example PF-MOVIS carry out high-speed stirring; Then the weighting agent that adds aequum for example barite is adjusted to about 1.10g/cm drilling fluid density
3～1.80g/cm
3, carry out high-speed stirring, finally pack in digestion tank aging.Obtain drilling fluid of the present invention.
Embodiment
the preparation of drilling fluid
The organophilic clay of using in embodiment is PF-MOGEL, by COSL, is provided; Primary emulsion is PF-MOEMUL-P, by COSL, is provided; Auxiliary emulsifying agent PF-MOCOAT, is provided by COSL; Wetting agent is PF-MOWET, by COSL, is provided; Fluid loss agent is PF-MOHFL, by COSL, is provided.
embodiment 1
A. fill a prescription:
Gas liquefaction: 70 parts;
Massfraction is 30% calcium chloride water: 30 parts; And
Cumulative volume umber based on gas liquefaction and calcium chloride water (100 parts) is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：1.0％；
PF-MOCOAT：1.5％；
Calcium oxide: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
Weighting agent: barite 32.5%.
B. blending process: add the PF-MOGEL middling speed of described mass volume ratio to stir 8min in the gas liquefaction of described volume parts, add PF-MOEMUL-P, the PF-MOCOAT high-speed stirring 2min of described mass volume ratio; The calcium chloride water that the massfraction that adds described volume parts under the condition of high-speed stirring is 30%, high-speed stirring 20min; The calcium oxide high-speed stirring 5min that adds described mass volume ratio; The PF-MOWET high-speed stirring 5min that adds described mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds described mass volume ratio; Add the barite of described mass volume ratio that drilling fluid density is adjusted to 1.2g/cm
3, high-speed stirring 20min, packs in digestion tank in 100 ℃ of aging 16h.Obtain drilling fluid.
embodiment 2
A. fill a prescription:
Gas liquefaction: 70 parts;
Massfraction is 30% calcium chloride water: 30 parts; And
Cumulative volume umber based on gas liquefaction and calcium chloride water (100 parts) is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：1.0％；
PF-MOCOAT：1.5％；
Calcium oxide: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
PF-MOVIS:0.3% (what formed through polycondensation under the protection of nitrogen by hexanodioic acid and triethylene tetramine has a non-linear cancellated high molecular polymer, and molecular weight is 87000, and opening lateral skill Chemical Co., Ltd. by Guangdong provides);
Weighting agent: barite 32.5%.
B. blending process: add the PF-MOGEL middling speed of described mass volume ratio to stir 8min in the gas liquefaction of described volume parts, add PF-MOEMUL-P, the PF-MOCOAT high-speed stirring 2min of described mass volume ratio; The calcium chloride water that the massfraction that adds described volume parts under the condition of high-speed stirring is 30%, high-speed stirring 20min; The calcium oxide high-speed stirring 5min that adds described mass volume ratio; The PF-MOWET high-speed stirring 5min that adds described mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds described mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds described mass volume ratio; Add the barite of described mass volume ratio that drilling fluid density is adjusted to 1.2g/cm
3, high-speed stirring 20min, packs in digestion tank in 100 ℃ of aging 16h.
embodiment 3
A. fill a prescription:
Gas liquefaction: 80 parts;
Massfraction is 25% calcium chloride water: 20 parts; And
Cumulative volume umber based on gas liquefaction and calcium chloride water (100 parts) is each component of following mass volume ratio:
PF-MOGEL：2.5％；
PF-MOEMUL-P：0.8％；
PF-MOCOAT：1.8％；
Calcium oxide: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
Weighting agent: barite 32.5%.
B. blending process: add the PF-MOGEL middling speed of described mass volume ratio to stir 8min in the gas liquefaction of described volume parts, add the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of described mass volume ratio, described mass volume ratio; The calcium chloride water that the massfraction that adds described volume parts under the condition of high-speed stirring is 25%, high-speed stirring 20min; The calcium oxide high-speed stirring 5min that adds described mass volume ratio; The PF-MOWET high-speed stirring 5min that adds described mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds described mass volume ratio; Add the barite of described mass volume ratio that drilling fluid density is adjusted to 1.2g/cm
3, high-speed stirring 20min, packs in digestion tank in 100 ℃ of aging 16h.Obtain drilling fluid.
embodiment 4
A. fill a prescription:
Gas liquefaction: 80 parts;
Massfraction is 25% calcium chloride water: 20 parts; And
Cumulative volume umber based on gas liquefaction and calcium chloride water (100 parts) is each component of following mass volume ratio:
PF-MOGEL：1.5％；
PF-MOEMUL-P：0.8％；
PF-MOCOAT：1.8％；
Calcium oxide: 2.5%;
PF-MOWET：0.8％；
PF-MOHFL：2.5％；
PF-MOVIS:0.5% (what formed through polycondensation under the protection of nitrogen by tartrate and triethylene tetramine has a non-linear cancellated high molecular polymer, and molecular weight is 85000, and opening lateral skill Chemical Co., Ltd. by Guangdong provides);
Weighting agent: barite 32.5%.
B. blending process: add the PF-MOGEL middling speed of described mass volume ratio to stir 8min in the gas liquefaction of described volume parts, add the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of described mass volume ratio, described mass volume ratio; The calcium chloride water that the massfraction that adds described volume parts under the condition of high-speed stirring is 25%, high-speed stirring 20min; The calcium oxide high-speed stirring 5min that adds described mass volume ratio; The PF-MOWET high-speed stirring 5min that adds described mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds described mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds described mass volume ratio; Add the barite of described mass volume ratio that drilling fluid density is adjusted to 1.2g/cm
3, high-speed stirring 20min, packs in digestion tank in 100 ℃ of aging 16h.Obtain drilling fluid.
embodiment 5
A. fill a prescription:
Gas liquefaction: 90 parts;
Massfraction is 35% calcium chloride water: 10 parts; And
Cumulative volume umber based on gas liquefaction and calcium chloride water (100 parts) is each component of following mass volume ratio:
PF-MOGEL：3.0％；
PF-MOEMUL-P：1.5％；
PF-MOCOAT：2.2％；
Calcium oxide: 3.0%;
PF-MOWET：1.5％；
PF-MOHFL：3.0％；
PF-MOVIS:0.9% (what formed through polycondensation under the protection of nitrogen by hexanodioic acid and triethylene tetramine has a non-linear cancellated high molecular polymer, and molecular weight is 87000, and opening lateral skill Chemical Co., Ltd. by Guangdong provides);
Weighting agent: barite 81.5%.
B. blending process: add the PF-MOGEL middling speed of described mass volume ratio to stir 8min in the gas liquefaction of described volume parts, add the PF-MOCOAT high-speed stirring 2min of the PF-MOEMUL-P of described mass volume ratio, described mass volume ratio; The calcium chloride water that the massfraction that adds described volume parts under the condition of high-speed stirring is 35%, high-speed stirring 20min; The calcium oxide high-speed stirring 5min that adds described mass volume ratio; The PF-MOWET high-speed stirring 5min that adds described mass volume ratio; The PF-MOHFL high-speed stirring 8min that adds described mass volume ratio; The PF-MOVIS high-speed stirring 6min that adds described mass volume ratio; Add the barite of described mass volume ratio that drilling fluid density is adjusted to 1.5g/cm
3, high-speed stirring 20min, packs in digestion tank in 150 ℃ of aging 16h.Obtain drilling fluid.
the performance test of drilling fluid
To the drilling fluid of embodiment 1-5 at 65.5 ℃
eS (emulsion-breaking voltage), 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 (apparent viscosity), PV (plastic viscosity), 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 in 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, the regulation of pressing SY/T5621 at 65.5 ℃ is measured drilling fluid
reading, and calculate its AV, PV, YP; At 65.5 ℃, use low-shear viscosity meter according to the Q/HS6008-2010 of China National Offshore Oil Corporation (CNOOC) standard test drilling fluid the LSRV at 0.3r/min; With electrical stability tester, measure the emulsion-breaking voltage of drilling fluid; With high pressure high temperature filter tester, press the FL of API standard test drilling fluid
hTHP.
The performance of table 1. synthetic base drilling fluid
As can be seen from Table 1, the low-shear rate viscosity (LSRV) of the gas liquefaction synthetic base drilling fluid of embodiment 1～5 is all very high, and being added with activation carries and cuts embodiment 2, the embodiment 4 of agent and the low-shear rate viscosity (LSRV) of embodiment 5 drilling fluids all higher than 80000mPa.s, the gas liquefaction synthetic base drilling fluid that these several different densities are described suspends and carries the very capable of drilling cuttings, because their plastic viscosity is little, therefore the raising of rate of penetration is had to important effect.
From the test result of table 1, it can also be seen that, the effect of the drilling fluid of embodiment 2 is better than not the effect containing the 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
all, than the height of embodiment 1, the PV of embodiment 2 is lower than embodiment's 1.
In the test result of table 1, the effect of the drilling fluid of the embodiment 4 of the PF-MOVIS that contains 0.5 part and PF-MOGEL content lower (lower than embodiment 1) is better than not the effect containing the drilling fluid of PF-MOVIS and the higher embodiment 3 of PF-MOGEL content: the LSRV of embodiment 4 is up to 89488mPa.s, and the YP of embodiment 4 and
all, than the height of embodiment 3, the PV of embodiment 4 is lower than embodiment's 3.
The density of embodiment 5 gas liquefaction synthetic base drilling fluids is 1.5g/cm
3, temperature resistance reaches 150 ℃, and low-shear rate viscosity, up to 116000mPa.s, illustrates the ability that this drilling fluid has equally very strong suspension and carries drilling cuttings at 150 ℃.
Hence one can see that, adds after PF-MOVIS in drilling fluid, can further improve the low-shear rate viscosity of synthetic base drilling fluid, reduces its plastic viscosity, improves the suspension of drilling fluid and the ability of carrying drilling cuttings, and the raising of rate of penetration is had to important effect.
Should understand; above-described embodiment is only preferred embodiment of the present invention; be not intended to limit protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a gel synthetic base drilling fluid a little less than, it comprises following component:
Gas oil synthetic base base fluid processed: 60～95 parts by volume;
Massfraction is 25～35% calcium chloride water: 5～40 parts by volume; And
Cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water is by mass volume ratio,
Organophilic clay: 1.0～3.5%; Described organophilic clay is PF-MOGEL;
Primary emulsion: 0.5～4.0%; Described primary emulsion is PF-MOEMUL-P;
Auxiliary emulsifying agent: 0.5～3.5%; Described auxiliary emulsifying agent is PF-MOCOAT;
Calcium oxide: 0.5～3.5%;
Wetting agent: 0.5～2.5%; Described wetting agent is PF-MOWET;
Fluid loss agent: 1.0～4.0%; Described fluid loss agent is PF-MOHFL;
Weighting agent: 20～100%; Described weighting agent is barite;
Activation is carried and is cut agent: 0.3～1.5%; Wherein said activation is carried and cut agent is PF-MOVIS;
Wherein, PF-MOGEL, PF-MOEMUL-P, PF-MOCOAT, PF-MOWET and PF-MOHFL are provided by COSL; PF-MOVIS opens lateral skill Chemical Co., Ltd. by Guangdong and provides.
2. weak gel synthetic base drilling fluid as described in claim 1, it comprises following component:
Gas oil synthetic base base fluid processed: 70～90 parts by volume;
Massfraction is 25～35% calcium chloride water: 10～30 parts by volume; And
Cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water is by mass volume ratio,
Organophilic clay: 1.0～3.0%;
Primary emulsion: 0.5～2.5%;
Auxiliary emulsifying agent: 0.5～2.5%;
Calcium oxide: 1.5～3.5%;
Wetting agent: 0.5～2.0%;
Fluid loss agent: 2～4%;
Weighting agent: 32～90%;
Activation is carried and is cut agent: 0.3～1.2%.
3. weak gel synthetic base drilling fluid as described in claim 1, wherein the cumulative volume umber based on described gas oil synthetic base base fluid processed and described calcium chloride water is by mass volume ratio,
Organophilic clay: 1.5～3.0%;
Primary emulsion: 0.8～1.5%;
Auxiliary emulsifying agent: 1.5～2.2%;
Calcium oxide: 2.0～3.0%;
Wetting agent: 0.8～2.0%;
Fluid loss agent: 2.5～3.5%;
Activation is carried and is cut agent: 0.3～1.0%.
4. a method of preparing the weak gel synthetic base drilling fluid described in any one in claim 1-3, comprising: in synthetic base base fluid, add aequum organophilic clay, carry out middling speed stirring; Then add the primary emulsion of aequum, auxiliary emulsifying agent to carry out high-speed stirring; Then the calcium chloride water that the massfraction that adds aequum under the condition of high-speed stirring is 25～35%, carries out high-speed stirring; Then add the calcium oxide of aequum to carry out high-speed stirring; Then add the wetting agent of aequum to carry out high-speed stirring; Then add the fluid loss agent of aequum to carry out high-speed stirring; Then add the activation of aequum to carry to cut agent and carry out high-speed stirring; Then add the weighting agent of aequum that drilling fluid density is adjusted to 1.10g/cm
3～1.80g/cm
3, carry out high-speed stirring, finally pack in digestion tank aging.
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| CN102796497A (en) * | 2012-09-07 | 2012-11-28 | 天津中海油服化学有限公司 | Gas oil base invert oil-emulsion drilling fluid and preparation method |
| CN103013474A (en) * | 2012-12-28 | 2013-04-03 | 中国石油集团川庆钻探工程有限公司 | Preparation method of synthetic base drilling fluid |
| CN103045210B (en) * | 2013-01-18 | 2015-06-17 | 中国石油化工股份有限公司 | High-efficiency plugging oil-base drilling fluid and preparation method thereof |
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| CN103320104B (en) * | 2013-06-27 | 2015-09-02 | 中国石油大学(北京) | A kind of water-in-oil-type biofuel base drilling fluid and preparation method thereof |
| CN103710010B (en) * | 2013-12-30 | 2017-02-22 | 安东石油技术（集团）有限公司 | High-temperature resistant oil base drilling fluid system |
| CN103788934B (en) * | 2014-01-20 | 2016-03-16 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of without soil phase oil base drilling fluid |
| CN104327811B (en) * | 2014-09-18 | 2017-12-01 | 中国石油天然气集团公司 | Environment-friendly type high temperature resistance gas liquefaction synthetic base drilling fluid and preparation method and application |
| 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 |
| CN105586022B (en) * | 2014-10-22 | 2018-11-02 | 中国石油化工股份有限公司 | A kind of high temperature resistance Water-In-Oil base drilling fluid and preparation method thereof |
| CN105586020B (en) * | 2014-10-22 | 2018-10-12 | 中国石油化工股份有限公司 | A kind of full oil base drilling fluid and preparation method thereof |
| CN104789196B (en) * | 2015-04-03 | 2017-07-04 | 中国石油大学(北京) | A kind of oil base drilling fluid wetting agent and preparation method thereof |
| CN104818004B (en) * | 2015-05-20 | 2018-03-27 | 中国海洋石油总公司 | One kind thickening extracting and cutting agent and its production and use |
| 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 |
| 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 |
| CN108239528A (en) * | 2016-12-23 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of oil base drilling fluid |
| CN109971440B (en) * | 2019-04-04 | 2021-12-10 | 中国海洋石油集团有限公司 | Environment-friendly easily-degradable synthetic base drilling fluid and preparation method thereof |
| CN110564387B (en) * | 2019-08-22 | 2021-11-09 | 中国石油天然气集团有限公司 | 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 |
| CN115975611B (en) * | 2021-10-15 | 2024-03-19 | 中石化石油工程技术服务有限公司 | Wax removal preventing agent for drilling fluid and preparation method and application thereof |
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| US4528104A (en) * | 1982-08-19 | 1985-07-09 | Nl Industries, Inc. | Oil based packer fluids |
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| BR0202361B1 (en) * | 2002-06-21 | 2010-11-03 | oil-based biodegradable drilling fluid compositions and oil and gas well drilling process. | |
| CN102140334B (en) * | 2011-01-28 | 2013-08-21 | 中海油田服务股份有限公司 | Oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils |
| CN102304353B (en) * | 2011-07-08 | 2013-11-13 | 克拉玛依市金鑫科技有限公司 | Environmental-friendly type oil-based drilling fluid and preparation method thereof |
| CN103224771B (en) * | 2012-01-30 | 2016-09-28 | 中国石油化工股份有限公司 | A kind of high temperature high density synthetic base drilling fluid |
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