CN111676004A - High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof - Google Patents
High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 79
- 238000005553 drilling Methods 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 27
- 239000010428 baryte Substances 0.000 claims abstract description 27
- 229910052601 baryte Inorganic materials 0.000 claims abstract description 27
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 26
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000000080 wetting agent Substances 0.000 claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000000706 filtrate Substances 0.000 claims abstract description 10
- 239000007762 w/o emulsion Substances 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 79
- 238000003756 stirring Methods 0.000 claims description 44
- 239000010426 asphalt Substances 0.000 claims description 26
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 14
- 239000001110 calcium chloride Substances 0.000 claims description 14
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 14
- 239000002283 diesel fuel Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002199 base oil Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000440 bentonite Substances 0.000 claims description 8
- 229910000278 bentonite Inorganic materials 0.000 claims description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 8
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012267 brine Substances 0.000 claims description 5
- 239000004021 humic acid Substances 0.000 claims description 5
- 239000003077 lignite Substances 0.000 claims description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 229910017059 organic montmorillonite Inorganic materials 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000004062 sedimentation Methods 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 2
- 238000011085 pressure filtration Methods 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000009775 high-speed stirring Methods 0.000 description 6
- 238000013329 compounding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- -1 amido amine Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229930004069 diterpene Natural products 0.000 description 1
- 150000004141 diterpene derivatives Chemical class 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 150000002462 imidazolines Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/36—Water-in-oil emulsions
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The application provides a high temperature resistant ultra-high density oil-based drilling fluid, including following composition: the water-in-oil emulsion comprises a water-in-oil base fluid, a main emulsifier, an auxiliary emulsifier, a filtrate reducer, an alkalinity regulator, organic soil, a wetting agent and a weighting agent, wherein the weighting agent comprises barite and micro manganese powder Micromax. In addition, the application also provides a preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid. The high-temperature-resistant ultrahigh-density oil-based drilling fluid and the preparation method thereof can provide the highest density of 3.0g/cm3The high-temperature and high-pressure filtration loss is less than or equal to 6mL, the plastic viscosity PV is less than or equal to 71mPa & s, the dynamic shear force YP is less than or equal to 32Pa, and the dynamic sedimentation density difference △ rho is less than or equal to 0.05g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid has a viscosity-shear value within a reasonable range and good rheological property, and can meet the drilling requirements of three-high wells.
Description
Technical Field
The invention relates to the technical field of petroleum drilling engineering, in particular to drilling fluid and a preparation method thereof.
Background
With the further development of exploration and development technologies, the drilling of ultra-deep, ultra-high temperature and ultra-high pressure 'three-super well' is increasing. Due to the large formation pressure and the high downhole temperature (180-200 ℃), the drilling process faces the technical problems of high pressure (higher than 70MPa), high water sensitivity, easy collapse of shale, easy creep of a gypsum layer and the like. Aiming at the stratum, the oil-based drilling fluid is a main technical solution, and compared with the water-based drilling fluid, the oil-based drilling fluid has the advantages of high temperature resistance, salt resistance, calcium erosion resistance, contribution to well wall stability, good lubricity, small damage degree to an oil gas layer and the like.
When dealing with ultrahigh pressure stratum, stratum with strong water sensitivity and easy creep, the high temperature resistance (180-200 ℃) ultrahigh density (rho is more than or equal to 2.4g/cm3) An oil-based drilling fluid. However, the existing oil-based drilling fluid has low base liquid density, and the density of the oil-based drilling fluid is improved by adding more materials, so that the solid content is extremely high, and the contradiction relationship between rheological property and sedimentation stability is difficult to balance. As a result, there has been still less research on ultra-high density oil-based drilling fluid technology.
The Chinese patent application with the publication number of CN105623628A describes an ultra-high density oil-based drilling fluid and a preparation method thereof, and the density of the ultra-high density oil-based drilling fluid can reach 2.80g/cm at most3The test showed a maximum temperature resistance of 150 ℃.
At present, the temperature resistance is more than 150 ℃ and the density is higher than 2.80g/cm3And no description is given of oil-based drilling fluids having well-balanced rheological properties and sedimentation stability.
Disclosure of Invention
In view of the problems in the background art, the invention provides a high-temperature-resistant ultrahigh-density oil-based drilling fluid, which comprises the following components:
the water-in-oil emulsion comprises a water-in-oil base fluid, a main emulsifier, an auxiliary emulsifier, a filtrate reducer, an alkalinity regulator, organic soil, a wetting agent and a weighting agent, wherein the weighting agent comprises barite and micro manganese powder Micromax.
In some embodiments of the invention, the water-in-oil base fluid comprises a base oil and a brine in a volume ratio of 80:20 to 95: 5; the weighting agent comprises barite and micro manganese powder Micromax in a mass ratio of 80: 20-20: 80; the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid: 0.5-4 g of main emulsifier, 1-4 g of auxiliary emulsifier, 0.5-3 g of wetting agent, 4-8 g of filtrate reducer, 1-4 g of alkalinity regulator, 0-3 g of organic soil, 120-360 g of barite and 64-480 g of micro manganese powder.
In some embodiments of the invention, the base oil is a mineral oil or a diesel oil.
In some embodiments of the present invention, the brine is a calcium chloride aqueous solution with a mass concentration of 20-30%.
In some embodiments of the invention, the primary emulsifier is PF-MOMUL; the auxiliary emulsifier is PF-MOCOAT; the wetting agent is PF-MOWET-260.
In some embodiments of the invention, the alkalinity modulator is calcium oxide.
In some embodiments of the invention, the organic clay is an organobentonite or an organomonomontmorillonite.
In some embodiments of the present invention, the fluid loss additive is one or more selected from sulfonated asphalt, modified asphalt, natural asphalt, humic acid amide, organic lignite, and emulsified asphalt.
In some embodiments of the invention, the oil-based drilling fluid has a density of up to 2.4g/cm3～3.0g/cm3And after rolling aging for 16h at 200 ℃, the HTHP FL (180 ℃) is less than or equal to 6 mL.
In addition, the invention provides a preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid, which comprises the following steps:
A. measuring base oil, respectively adding a main emulsifier, an auxiliary emulsifier and a wetting agent, and stirring;
B. adding saline water, and stirring;
C. respectively adding an alkalinity regulator, organic soil and a filtrate reducer, and continuously stirring;
D. adding weighting agent and stirring;
the weighting agent comprises barite and micro manganese powder Micromax.
In some embodiments of the invention, the water-in-oil base fluid comprises a base oil and a brine in a volume ratio of 80:20 to 95: 5; the weighting agent comprises barite and micro manganese powder Micromax in a mass ratio of 80: 20-20: 80; the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid: 0.5-4 g of main emulsifier, 1-4 g of auxiliary emulsifier, 0.5-3 g of wetting agent, 4-8 g of filtrate reducer, 1-4 g of alkalinity regulator, 0-3 g of organic soil, 120-360 g of barite and 64-480 g of micro manganese powder.
In some embodiments of the invention, the stirring time in the step A is 4-6 min; the stirring time in the step B is 15-20 min; the stirring time in the step C is 10-20 min; the stirring time in the step D is 30-40 min; and the stirring speed in the steps A to D is 12000 r/min.
The ultrahigh-density oil-based drilling fluid disclosed by the invention has the following properties: the density is 3.0g/cm at most3The high-temperature high-pressure filtration loss is less than or equal to 6mL, the plastic viscosity PV is less than or equal to 71mPa & s, the dynamic shear force YP is less than or equal to 32Pa, and the dynamic settling density difference △ rho is less than or equal to 0.05g/cm3。
Compared with the prior art, the invention has the following beneficial effects:
1. the highest density of the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the invention can reach 3.0g/cm3Temperature resistance up to 200 ℃;
2. the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the invention has good emulsification stability, rheological property and sedimentation stability;
3. the treating agent of the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the invention is small in dosage and low in preparation cost;
4. the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the invention is small in filtration loss, and the weighting material can be acidified and is easy to flowback, so that the reservoir is slightly damaged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail with reference to specific embodiments. It should be understood, however, that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.
Before describing in detail specific embodiments of the present invention, the following description will proceed with reference being made to specific components used in the following examples:
the main emulsifier is a high-temperature resistant oil-based drilling fluid main emulsifier, and mainly adopts diterpene oxygenated surfactant (code PF-MOMUL) produced by Zhonghai oil-well oilfield chemical company.
The auxiliary emulsifier is called high temperature resistant oil-based drilling fluid auxiliary emulsifier, and is mainly alkyl polybasic amide surfactant (PF-MOCOAT) produced by Zhonghai oil field chemical company.
The wetting agent is a mixture (code PF-MOWET-260) of a polybasic amido amine surfactant and an imidazoline derivative produced by Zhonghai oil field chemical company.
The filtrate reducer is mainly prepared by compounding one or more of commercial sulfonated asphalt, modified asphalt, natural asphalt, humic acid amide, organic lignite and emulsified asphalt
The alkalinity regulator mainly adopts the commercially available calcium oxide.
The organic soil is mainly organic bentonite or organic montmorillonite which is commercially available.
The weighting agent mainly adopts commercially available barite (meeting API standard or having granularity of 2000-5000 meshes) to be compounded with micro manganese powder Micromax sold by Gulaite science and technology corporation.
Examples 1-6 provide high temperature resistant ultra high density oil-based drilling fluids having the following additive content (in g):
the preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the invention comprises the following steps:
A. measuring base oil, respectively adding a main emulsifier, an auxiliary emulsifier and a wetting agent, and stirring;
B. adding saline water, and stirring;
C. respectively adding an alkalinity regulator, organic soil and a filtrate reducer, and continuously stirring;
D. adding weighting agent and stirring;
the volume ratio of the base oil to the brine is 80: 20-95: 5; the weighting agent is formed by compounding barite and micro-manganese powder Micromax.
And the stirring speed in the steps A to D is 12000 r/min.
Example 1
This example provides a density of 2.4g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid consists of No. 0 diesel oil with the volume ratio of 85:15 and 25 percent calcium chloride aqueous solution;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
PF-MOMUL 0.8g, PF-MOCOAT 1g, PF-MOWET-2601 g, modified asphalt 5g, calcium oxide 3g, organic bentonite 1.5g, barite 192g and micro manganese powder Micromax 128 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 255mL of No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 2.4g of PF-MOMUL, 3g of PF-MOCOAT and 2603 g of PF-MOWET, and stirring for 4 min;
B. adding 45mL of 25% calcium chloride aqueous solution, and stirring for 15 min;
C. respectively adding 9g of calcium oxide, 4.5g of organic bentonite and 15g of modified asphalt, and stirring for 10 min;
D. 575g of barite and 385g of micro manganese powder are added and stirred for 30 min.
And the stirring speed in the steps A to D is 12000 r/min.
Example 2
This exampleProvides a density of 2.6g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid comprises No. 0 diesel oil with the volume ratio of 90:10 and a calcium chloride aqueous solution with the concentration of 25 percent;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
PF-MOMUL 0.8g, PF-MOCOAT 1g, PF-MOWET-2602 g, humic acid amide 5g, calcium oxide 2g, organic bentonite 1g, barite 234g and micro manganese powder Micromax 156 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 270mL No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 2.4g of PF-MOMUL, 3g of PF-MOCOAT and 2606 g of PF-MOWET, and stirring for 5 min;
B. adding 30mL of 25% calcium chloride aqueous solution, and stirring for 18 min;
C. respectively adding 6g of calcium oxide, 3g of organic bentonite and 15g of humic acid amide, and stirring for 15 min;
D. adding 702g of barite and 468g of Micromax powder, and stirring for 35 min.
And the stirring speed in the steps A to D is 12000 r/min.
Example 3
This example provides a density of 2.8g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid comprises No. 0 diesel oil with the volume ratio of 90:10 and a calcium chloride aqueous solution with the concentration of 25 percent;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
PF-MOMUL 1g, PF-MOCOAT 1g, PF-MOWET-2602 g, modified asphalt 6g, calcium oxide 3g, organic bentonite 0.3g, barite 291g and micro manganese powder Micromax 194 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 270mL No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 3g of PF-MOMUL, 3g of PF-MOCOAT and 2606 g of PF-MOWET, and stirring for 6 min;
B. adding 30mL of 25% calcium chloride aqueous solution, and stirring for 20 min;
C. respectively adding 9g of calcium oxide, 0.9g of organic bentonite and 18g of modified asphalt, and stirring for 20 min;
D. 873g of barite and 582g of Micromax of micro manganese powder are added and stirred for 40 min.
And the stirring speed in the steps A to D is 12000 r/min.
Example 4
This example provides a density of 3.0g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid comprises No. 0 diesel oil with the volume ratio of 95:5 and 25 percent calcium chloride aqueous solution;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
PF-MOMUL 1g, PF-MOCOAT 1g, PF-MOWET-2602 g, modified asphalt 6g, calcium oxide 3g, barite 360g and micro manganese powder 240 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 270mL No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 3g of PF-MOMUL, 3g of PF-MOCOAT and 2606 g of PF-MOWET, and stirring for 5 min;
B. adding 15mL of 25% calcium chloride aqueous solution, and stirring for 15 min;
C. respectively adding 9g of calcium oxide and 18g of modified asphalt, and stirring for 20 min;
D. 1080g of barite and 720g of Micromax of micro manganese powder are added and stirred for 40 min.
And the stirring speed in the steps A to D is 12000 r/min.
Example 5
This example provides a density of 2.4g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid comprises mineral oil and 20% calcium chloride aqueous solution in a volume ratio of 80: 20;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
PF-MOMUL 0.5g, PF-MOCOAT 3g, PF-MOWET-2600.5 g, natural asphalt 2g, organic lignite 2g, calcium oxide 1g, organic montmorillonite 3g, barite 256g and micro manganese powder Micromax 64 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 240mL No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 1.5g of PF-MOMUL, 9g of PF-MOCOAT and 78 g of PF-MOWET-2601.5 g, and stirring for 5 min;
B. adding 60mL of 20% calcium chloride aqueous solution, and stirring for 15 min;
C. respectively adding 3g of calcium oxide, 9g of organic montmorillonite, 6g of natural asphalt and 6g of organic lignite, and stirring for 20 min;
D. 768g of barite and 192g of micro-manganese powder are added and stirred for 40 min.
And the stirring speed in the steps A to D is 12000 r/min.
Example 6
This example provides a density of 3.0g/cm3The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil base fluid comprises No. 0 diesel oil with the volume ratio of 95:5 and calcium chloride aqueous solution with the concentration of 30 percent;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
F-MOMUL 4g, PF-MOCOAT 4g, PF-MOWET-2603 g, modified asphalt 3g, sulfonated asphalt 3g, emulsified asphalt 2g, calcium oxide 4g, barite 120g and micro manganese powder Micromax 480 g.
The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring 270mL No. 0 diesel oil by using a measuring cylinder, pouring into a high-speed stirring cup, respectively adding 12g of F-MOMUL, 12g of PF-MOCOAT and 2609 g of PF-MOWET, and stirring for 5 min;
B. adding 15mL of 30% calcium chloride aqueous solution, and stirring for 15 min;
C. respectively adding 12g of calcium oxide, 3g of modified asphalt, 3g of sulfonated asphalt and 2g of emulsified asphalt, and stirring for 20 min;
D. adding 360g of barite and 1440g of Micromax powder, and stirring for 40 min.
And the stirring speed in the steps A to D is 12000 r/min.
Comparative example 1
The composition and content of the oil-based drilling fluid provided by the comparative example are basically the same as those of example 1, except that the compounding ratio of the barite to the micro-manganese powder is 90: 10.
Comparative example 2
The composition and content of the oil-based drilling fluid provided by the comparative example are substantially the same as those of example 3, except that 100% barite weighting is used, i.e., no micro-manganese powder weighting is used.
Comparative example 3
The oil-based drilling fluid provided by this comparative example had essentially the same composition and content as example 4, except that the wetting agent was added in an amount of 0 g.
Comparative example 4
The composition and content of the oil-based drilling fluid provided by this comparative example was substantially the same as example 4, except that the oil-to-water ratio was 70: 30.
Testing the performance of the high-temperature resistant ultra-high density oil-based drilling fluid:
the test method comprises the following steps: the ultra-high density drilling fluids prepared in examples 1 to 6 and comparative examples 1 to 4 were placed in an aging tank and hot rolled at a high temperature of 200 ℃ for 16 hours, and the rheological properties and the dynamic settling stability of the drilling fluids were measured according to the oil-based drilling fluid test procedure (GB/T16783.2-2012), with the test results shown in Table 1.
TABLE 1 rheological Property evaluation results of ultra-high density oil-based drilling fluids (200 ℃ C. hot roll 16h)
As can be seen from the performance test results of table 1: after the high-temperature-resistant ultrahigh-density oil-based drilling fluid provided by the embodiment of the invention is aged for 16 hours at the high temperature of 200 ℃, the density of the drilling fluid is 2.4g/cm3～3.0g/cm3Viscosity (AV, PV) and shear force (YP, G) thereof10s、G10min) The viscosity-cut value is in a reasonable range and the rheological property is good. The dynamic settling density difference of the comparative example 1 is obviously increased, the viscosity of the oil-based drilling fluid of the comparative example 2-4 is very high, and the oil-based drilling fluid cannot be tested and cannot meet the field application requirements.
Through the comparison, the ultrahigh-density oil-based drilling fluid provided by the invention is proved to have the density of up to 3.0g/cm3The high-temperature-resistant drilling fluid still has good performance after being aged at the temperature of 200 ℃, and can meet the drilling requirements of three-high wells.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and are not limitative. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following components:
the water-in-oil emulsion comprises a water-in-oil base fluid, a main emulsifier, an auxiliary emulsifier, a filtrate reducer, an alkalinity regulator, organic soil, a wetting agent and a weighting agent, wherein the weighting agent comprises barite and micro manganese powder Micromax.
2. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1, wherein:
the water-in-oil base fluid comprises base oil and brine in a volume ratio of 80: 20-95: 5;
the weighting agent comprises barite and micro manganese powder Micromax in a mass ratio of 80: 20-20: 80;
the addition amount of the other components is as follows based on every 100mL of water-in-oil base liquid:
0.5-4 g of main emulsifier, 1-4 g of auxiliary emulsifier, 0.5-3 g of wetting agent, 4-8 g of filtrate reducer, 1-4 g of alkalinity regulator, 0-3 g of organic soil, 120-360 g of barite and 64-480 g of micro manganese powder.
3. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the base oil is mineral oil or diesel oil.
4. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the saline water is a calcium chloride water solution with the mass concentration of 20-30%.
5. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein:
the main emulsifier is PF-MOMUL; the auxiliary emulsifier is PF-MOCOAT; the wetting agent is PF-MOWET-260.
6. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the alkalinity regulator is calcium oxide.
7. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the organic soil is organic bentonite or organic montmorillonite.
8. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the fluid loss additive is one or more of sulfonated asphalt, modified asphalt, natural asphalt, humic acid amide, organic lignite and emulsified asphalt.
9. The high temperature resistant ultra-high density oil-based drilling fluid of claim 1 or 2, wherein: the density of the oil-based drilling fluid reaches 2.4g/cm3～3.0g/cm3And after rolling aging for 16h at 200 ℃, the HTHP FL (180 ℃) is less than or equal to 6 mL.
10. The preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises the following steps:
A. measuring base oil, respectively adding a main emulsifier, an auxiliary emulsifier and a wetting agent, and stirring;
B. adding saline water, and stirring;
C. respectively adding an alkalinity regulator, organic soil and a filtrate reducer, and continuously stirring;
D. adding weighting agent and stirring;
the weighting agent comprises barite and micro manganese powder Micromax.
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| US12398308B2 (en) | 2023-10-02 | 2025-08-26 | King Fahd University Of Petroleum And Minerals | Method for reducing hydrogen sulfide (H2S) content of H2S-containing subterranean formation |
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