WO2021055859A1 - Degradable polymeric nanoparticles and uses thereof - Google Patents
Degradable polymeric nanoparticles and uses thereof Download PDFInfo
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- WO2021055859A1 WO2021055859A1 PCT/US2020/051641 US2020051641W WO2021055859A1 WO 2021055859 A1 WO2021055859 A1 WO 2021055859A1 US 2020051641 W US2020051641 W US 2020051641W WO 2021055859 A1 WO2021055859 A1 WO 2021055859A1
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- drilling mud
- water
- self
- degrading
- synthetic
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- 239000002105 nanoparticle Substances 0.000 title claims abstract description 94
- 238000005553 drilling Methods 0.000 claims abstract description 97
- 238000000034 method Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012065 filter cake Substances 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 12
- 229910021647 smectite Inorganic materials 0.000 claims abstract description 9
- 239000002734 clay mineral Substances 0.000 claims abstract description 7
- -1 for example Substances 0.000 claims abstract description 6
- 239000004971 Cross linker Substances 0.000 claims description 28
- 229910000278 bentonite Inorganic materials 0.000 claims description 20
- 239000000440 bentonite Substances 0.000 claims description 20
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 20
- 239000000178 monomer Substances 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 11
- 230000000593 degrading effect Effects 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- FWFUWXVFYKCSQA-UHFFFAOYSA-M sodium;2-methyl-2-(prop-2-enoylamino)propane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(C)(C)NC(=O)C=C FWFUWXVFYKCSQA-UHFFFAOYSA-M 0.000 claims description 10
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 5
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 5
- 229910001919 chlorite Inorganic materials 0.000 claims description 3
- 229910052619 chlorite group Inorganic materials 0.000 claims description 3
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052900 illite Inorganic materials 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052622 kaolinite Inorganic materials 0.000 claims description 3
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 3
- 229910052902 vermiculite Inorganic materials 0.000 claims description 3
- 239000010455 vermiculite Substances 0.000 claims description 3
- 235000019354 vermiculite Nutrition 0.000 claims description 3
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims 1
- 208000005156 Dehydration Diseases 0.000 description 31
- 239000008186 active pharmaceutical agent Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000012986 chain transfer agent Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000007281 self degradation Effects 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 238000000733 zeta-potential measurement Methods 0.000 description 1
Classifications
-
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/003—Means for stopping loss of drilling fluid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Definitions
- the present invention generally relates in particular, but not exclusively, to the drilling industry and to the field of water-based drilling muds. More specifically, the present invention relates to synthetic degradable polymeric nanoparticles as a fluid- loss additive to water-based drilling muds.
- the present invention is directed to a drilling mud.
- the drilling mud comprises a degradable fluid loss additive, a clay mineral and a base fluid.
- the present invention also is directed to a water-based drilling mud.
- the water-based drilling mud comprises a synthetic degradable polymeric nanoparticle having a plurality of monomers crosslinked by a self degrading crosslinker, a smectite and water.
- the present invention is directed further to a water-based bentonite drilling mud comprising synthetic nanoparticles, each comprising a plurality of monomers copolymerized with a self degrading crosslinker.
- the present invention is directed further still to a method for preventing leak- off during a drilling operation.
- the water-based drilling mud described herein is introduced into a well.
- a layer of filter cake comprising the synthetic degradable polymeric nanoparticles is formed on a rock surface in the well, thereby preventing leak off into a formation rock.
- the present invention is directed to a related method for preventing leak-off further comprising self-degrading hydrolytically the synthetic degradable polymeric nanoparticles in the layer into low molecular weight, short-chained polymers to cleanup the filter cake
- the present invention is directed further still to a method for automatically cleaning-up filter cake after completion of a drilling process.
- the water-based bentonite drilling mud described herein is introduced into a well during the drilling process, where the synthetic nanoparticles reduce fluid loss from the filter cake formed during the drilling process and where the synthetic nanoparticles self degrade via hydrolysis of the self-degrading crosslinkers therein after completion of the drilling process.
- FIGS. 1A-1B illustrate how nanoparticle concentration affects fluid loss.
- fluid loss Api in milliliters is measured over 30 minutes at 95 °C and 25 °C as nanoparticle concentration increases to 1.00 wt%.
- the percentage of reduction in fluid loss is measured over 60 minutes at 95 °C and 25 °C as nanoparticle concentration increases to 1.00 wt%.
- FIG. 2 illustrates how increasing temperatures from 0 °C to 120 °C affect fluid loss over 30 minutes of 5% bentonite alone and in the presence of 0.61% nanoparticles.
- FIG. 3 illustrates how increasing nanoparticle concentration in 2% NaCI from 0 to 1.00 wt% in 5% bentonite affects fluid loss over 30 minutes at 95 °C.
- FIG. 4 illustrates the self degradation of 0.61% nanoparticles in 5% bentonite over 30 days.
- the term “about” refers to a numeric value, including, for example, whole numbers, fractions, and percentages, whether or not explicitly indicated.
- the term “about” generally refers to a range of numerical values (e.g., +/- 5-10% of the recited value) that one of ordinary skill in the art would consider equivalent to the recited value (e.g., having the same function or result).
- the recitation of about 95 °C encompasses a range of 85.5 °C to 104.5 °C.
- a drilling mud comprising a degradable fluid loss additive; a clay mineral; and a base fluid.
- the degradable fluid loss additive may be a synthetic degradable polymeric nanoparticle.
- the synthetic degradable polymeric nanoparticle may comprise a plurality of monomers cross-linked by a self-degrading crosslinker.
- the plurality of monomers comprises 2- acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid.
- the self-degrading crosslinker is an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester.
- a representative example of a self-degrading crosslinker is /V,/V’-methylenebis(acrylamide).
- the synthetic degradable polymeric nanoparticle may have a concentration of about 0.21 wt% to about 1.00 wt% in the base fluid.
- the clay mineral may be a smectite, a kaolinite, an illite, a vermiculite, a chlorite or a combination thereof.
- the base fluid may be water.
- a water- based drilling mud comprising a synthetic degradable polymeric nanoparticle having a plurality of monomers crosslinked by a self degrading crosslinker; a smectite; and water.
- the plurality of monomers may comprise 2-acrylamido-2- methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid.
- the self-degrading crosslinker may be an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester.
- a representative example of a self-degrading crosslinker is /V,/V’-methylenebis(acrylamide).
- the smectite may be bentonite.
- the synthetic degradable polymeric nanoparticle may have a concentration of about 0.21 wt% to about 1.00 wt% therein.
- a method for preventing leak-off during a drilling operation comprising introducing the water-based drilling mud as described supra into a well; and forming a layer of filter cake comprising the synthetic degradable polymeric nanoparticles on a surface of a rock formation in the well, thereby preventing leak off into the rock formation.
- the method comprises self-degrading hydrolytically the synthetic degradable polymeric nanoparticles in the layer into low molecular weight, short-chained polymers to cleanup the filter cake.
- the self-degrading step may be controlled by a self degrading crosslinker comprising the synthetic degradable polymeric nanoparticle. Also in both embodiments the self-degrading step may occurs at about 95 °C.
- a water- based bentonite drilling mud comprising synthetic nanoparticles, each comprising a plurality of monomers copolymerized with a self degrading crosslinker.
- each of the synthetic nanoparticles may comprise monomers 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid copolymerized with /V,/V’-methylenebis(acrylamide).
- AMPS 2-acrylamido-2-methylpropane sulfonic acid sodium salt
- methacrylic acid copolymerized with /V,/V’-methylenebis(acrylamide) 2-acrylamido-2-methylpropane sulfonic acid sodium salt
- a method for automatically cleaning-up filter cake after completion of a drilling process comprising introducing the water-based bentonite drilling mud as described supra into a well during the drilling process, the synthetic nanoparticles reducing fluid loss from the filter cake formed during said drilling process and the synthetic nanoparticles self-degrading via hydrolysis of the self-degrading crosslinkers therein after completion of the drilling process.
- the composition of the drilling mud provides improved filtration and rheological properties and easy cleanup. Moreover, preventing leak-off further prevents formation rock damage and facilitates an easy clean up of the filter cake formed on the rock surface.
- the drilling mud is water-based and comprises a degradable fluid loss additive.
- the degradable fluid loss additive may be a synthetic degradable polymeric nanoparticle which improves the performance of water-based drilling muds by providing effective leakoff control during drilling operations.
- the degradable polymeric nanoparticles improve filtration properties and facilitate easy filter cake cleanup by self degrading at the end of the drilling process.
- the cost to manufacture the degradable polymeric nanoparticles is low and they are a cost effective alternative for the current expensive, non- degradable solid or polymeric particles as fluid loss additives.
- a clay mineral may comprise the drilling mud.
- a drilling mud may comprise a smectite, a kaolinite, an illite, a vermiculite, or a chlorite, or a combination thereof.
- a representative example of a drilling mud may comprise the degradable polymeric nanoparticles and bentonite.
- the degradable polymeric nanoparticle has the benefits of being both an effective fluid loss additive and self degrading to automatically breakdown the filter cake at the end of the drilling process. This is achieved through the hydrolysis of the degradable crosslinkers in the nanoparticle.
- the nanoparticle may be prepared by a two-step method. In the first step a cross-linked polymeric gel is synthesized by copolymerizing monomers and degradable crosslinkers in the presence of an initiator and a chain transfer agent in water. In the second step the nanoparticles are formed from the crosslinked polymeric gel via the application of high shear rates as is known and standard in the art. The final particle size can be controlled by varying the shear rate and shear time. The delay in filter cake breakdown is controlled by using different degradable crosslinkers.
- the synthetic degradable polymeric nanoparticles when formed as filter cake on the rock subsequently self-degrade via hydrolysis into low molecular weight short chain polymers for easy cleanup.
- the degradable crosslinker comprising the gel determines the rate of hydrolysis of the polymer and, thus, the delay in filter cake breakdown.
- the concentration of the synthetic degradable polymeric nanoparticles in the drilling mud correlates to the desired filtration and rheological properties. A change in the desired filtration and rheological properties is achieved by adjusting the concentration of the degradable nanoparticles in the mud.
- Crosslinkers with a slow rate of degradation at high or elevated temperatures are utilized for high temperature applications to delay the filter cake breakdown until the completion of the drilling operations.
- Representative crosslinkers in this class include, but are not limited to, acrylamide or methacrylamide compounds, for example, methylene biacrylamide.
- acrylamide or methacrylamide compounds for example, methylene biacrylamide.
- Representative crosslinkers in this class include, but are not limited to, acrylate or methacrylate ester compounds, for example, polyethylene glycol (PEG) 200-1000 diacrylate.
- the monomers 2-acrylamido-2- methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid and the crosslinker /V,/V’-methylenebis(acrylamide) are copolymerized in water in the presence of the chain transfer agent thioglycolic acid and the initiator VAZO 56 to produce the polymeric gel.
- the chain transfer agent (CTA) controls the polymer molecular weight.
- the polymeric gel is subjected to shear to produce the nanoparticles.
- the nanoparticles degrade to short polymer chains while exposed at a high temperature of 95 °C due to the use of the CTA to control polymer molecular during polymerization.
- Table 1 identifies the components and amounts in the synthetic scheme.
- Drilling mud is prepared by an OFITE’s Model 20 Constant Speed Blender according to API requirement (Recommended practice API 3B-1, 2017). Preparation of drilling mud for general study:
- Rheological properties of drilling muds are measured by an OFITE’s Model 900 Viscometer at room temperature, according to the API standard Recommended Practice API 3B-1, 2017. Measurement of fluid loss of drilling mud
- Fluid loss is measured by OFITE’s HTHP Filter Press equipment with OFITE filter paper, according to the API standard Recommended Practice API 3B-1, 2017. In each experiment, about 500 ml_ drilling fluid is prepared. Pressure of the OFITE Press cell is provided by a nitrogen (N2) gas charger. The cell and fluid collector pressures at experiments performed at different temperatures are summarized in Table 2. For each experiment, the fluid loss was collected and recorded at 0.5, 1.0, 5.0, 7.5, 15 and 30 minutes.
- Nanoparticle size and Zeta potential is performed by a NanoBrook Omni Nanoanalyzer.
- Nanoparticles are prepared in RO water by blending polymeric gel at 10000 rpm for 10 minutes.
- Samples are prepared by diluting 1-3 drops of the nanoparticle solution in a cuvette to approximately 4 mL with RO water or 2% NaCI. Size measurements are taken at a scattering angle of 90 C° and a temperature of 25 °C.
- Samples for Zeta potential measurements are prepared by diluting 1 drop of nanoparticles in a cuvette with 1.25 mL of 1 mM KOI or 2% NaCI.
- Zeta potential is measured using the phase analysis light scattering (PALS) technique.
- PALS phase analysis light scattering
- nanoparticle concentration and rheological properties at ambient temperature are shown in Table 4.
- the addition of nanoparticles has no significant impact on the rheological properties of drilling mud except at high nanoparticular concentration of 1%.
- the nanoparticle concentration and rheological properties at various temperatures are shown in Table 5. There is no significant impact on rheological properties observed at temperatures ranging from 25 °C to 80 °C by adding 0.61% nanoparticles.
- nanoparticles significantly improved filtration properties (fluid loss) in 2% NaCI at 95 °C (FIG. 3).
- the nanoparticle concentration and rheological properties at 25 °C are shown in Table 6.
- the addition of nanoparticles at different concentrations at 25 °C had little effect on the rheological properties.
- FIG. 4 shows that fluid loss returns to levels without nanoparticles after incubating 30 days at 95 °C indicating that the nanoparticles self degrade into linear, short chain polymer. Nanoparticle self degradation over a 30 day period is shown in Table 7. Nanoparticle self degradation can facilitate easy cleanup with minimal formation damage after drilling operations.
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Abstract
Provided herein are drilling muds, including water-based drilling muds. The components of the drilling muds are a degradable fluid loss additive, for example, synthetic degradable nanoparticles, a clay mineral, for example, a smectite, and a base fluid, for example, water. Also provide are methods for preventing leak-off during a drilling operation and for automatically cleaning-up filter cake after completion of a drilling process both of which utilize the drilling muds and water-based drilling muds.
Description
DEGRADABLE POLYMERIC NANOPARTICLES AND USES THEREOF
Cross-Reference to Related Applications
This international application claims benefit of priority under 35 U.S.C. §119(e) of provisional application U.S. Serial No. 62/903,361, filed September 20, 2019.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention generally relates in particular, but not exclusively, to the drilling industry and to the field of water-based drilling muds. More specifically, the present invention relates to synthetic degradable polymeric nanoparticles as a fluid- loss additive to water-based drilling muds.
Description of the Related Art
Effective fluid loss cntrol during drilling operations and complete filter cake cleanup at the end of the drilling process are critical to the succes of drilling oil and gas wells with minimal productivity damage. The current state of the art of using oxidized metal, inorganic or organic nanoparticles, natural or synthetic polymers as fluid loss additives suffer from high cost, low drilling efficiency, potential for high formation damage, and costly and time consuming efforts in filter cake cleanup at the end of the drilling process.
Minimizing the hydrocarbon productivity damage caused by the leakoff of fluid and particulates in the drilling mud into the hydrocarbon bearing formation is critical to the success of drilling operations in the oil and gas industry. Fluid loss additives are often added in the drilling muds to form filter cake on the rock face to minimize the leakoff of the fluid and particulates into the hydrocarbon bearing formation.
Effective filter cake cleanup remains a major challenge for the fluid-loss additives commonly used in the industry. If not removed at the end of the drilling process, the filter cake itself also can cause severe formation damage (1 ) that affects well productivity. Filter cake cleanup currently requires the use of either mechanical or chemical means after the drilling operations are completed which are costly and time consuming (2,3).
Thus, to overcome issues identified there is a need for a fluid loss additive that both forms filter cake to effectively prevent leakoff and which also can self degrade at the end of the drilling process. In particular there is no discussion in the prior art of solving the issue of filter cake retention by using degradable polymer materials and in particular degradable polymeric nanoparticles effective for fluid loss control. The present invention solves such long-standing issues that have not been solved by the art.
SUMMARY OF THE INVENTION
The present invention is directed to a drilling mud. The drilling mud comprises a degradable fluid loss additive, a clay mineral and a base fluid.
The present invention also is directed to a water-based drilling mud. The water-based drilling mud comprises a synthetic degradable polymeric nanoparticle having a plurality of monomers crosslinked by a self degrading crosslinker, a smectite and water.
The present invention is directed further to a water-based bentonite drilling mud comprising synthetic nanoparticles, each comprising a plurality of monomers copolymerized with a self degrading crosslinker.
The present invention is directed further still to a method for preventing leak- off during a drilling operation. In the method the water-based drilling mud described herein is introduced into a well. A layer of filter cake comprising the synthetic degradable polymeric nanoparticles is formed on a rock surface in the well, thereby preventing leak off into a formation rock. The present invention is directed to a related method for preventing leak-off further comprising self-degrading hydrolytically the synthetic degradable polymeric nanoparticles in the layer into low molecular weight, short-chained polymers to cleanup the filter cake
The present invention is directed further still to a method for automatically cleaning-up filter cake after completion of a drilling process. In the method the water-based bentonite drilling mud described herein is introduced into a well during the drilling process, where the synthetic nanoparticles reduce fluid loss from the filter cake formed during the drilling process and where the synthetic nanoparticles self degrade via hydrolysis of the self-degrading crosslinkers therein after completion of the drilling process.
Other and further aspects, features, benefits, and advantages of the present invention will be apparent from the following description of the presently preferred embodiments of the invention given for the purpose of disclosure. The invention is to cover not only individual embodiments, but combinations of those embodiments as well.
BRIEF DESCRIPTION OF THE DRAWINGS
So that the matter in which the above-recited features, advantages and objects of the invention, as well as others that will become clear, are attained and can be understood in detail, more particular descriptions of the invention briefly summarized above may be by reference to certain embodiments thereof that are described and which are illustrated in the appended drawings. These drawings form a part of the specification. It is to be noted, however, that the appended drawings illustrate preferred embodiments of the invention and therefore are not to be considered limiting in their scope.
FIGS. 1A-1B illustrate how nanoparticle concentration affects fluid loss. In FIG. 1A fluid lossApi in milliliters is measured over 30 minutes at 95 °C and 25 °C as nanoparticle concentration increases to 1.00 wt%. In FIG. 1B the percentage of reduction in fluid loss is measured over 60 minutes at 95 °C and 25 °C as nanoparticle concentration increases to 1.00 wt%.
FIG. 2 illustrates how increasing temperatures from 0 °C to 120 °C affect fluid loss over 30 minutes of 5% bentonite alone and in the presence of 0.61% nanoparticles.
FIG. 3 illustrates how increasing nanoparticle concentration in 2% NaCI from 0 to 1.00 wt% in 5% bentonite affects fluid loss over 30 minutes at 95 °C.
FIG. 4 illustrates the self degradation of 0.61% nanoparticles in 5% bentonite over 30 days.
DETAILED DESCRIPTION OF THE INVENTION
As used herein in the specification, “a” or “an” may mean one or more. As used herein in the claim(s), when used in conjunction with the word “comprising”, the words “a” or “an” may mean one or more than one.
As used herein "another" or “other” may mean at least a second or more of the same or different claim element or components thereof. Similarly, the word "or" is intended to include "and" unless the context clearly indicates otherwise. "Comprise" means "include."
As used herein, the term “about” refers to a numeric value, including, for example, whole numbers, fractions, and percentages, whether or not explicitly indicated. The term “about” generally refers to a range of numerical values (e.g., +/- 5-10% of the recited value) that one of ordinary skill in the art would consider equivalent to the recited value (e.g., having the same function or result). For example, the recitation of about 95 °C encompasses a range of 85.5 °C to 104.5 °C.
As used herein, the terms “synthetic degradable polymeric nanoparticle”, degradable polymeric nanoparticle”, “degradable polymeric nanoparticle”, and “degradable nanoparticle” and the plurals thereof are interchangeable.
In one embodiment of the present invention there is provided a drilling mud comprising a degradable fluid loss additive; a clay mineral; and a base fluid.
In this embodiment the degradable fluid loss additive may be a synthetic degradable polymeric nanoparticle. Particularly the synthetic degradable polymeric nanoparticle may comprise a plurality of monomers cross-linked by a self-degrading crosslinker. In an aspect of this embodiment the plurality of monomers comprises 2- acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid. In another aspect the self-degrading crosslinker is an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester. A representative example of a self-degrading crosslinker is /V,/V’-methylenebis(acrylamide). Also in this embodiment the synthetic degradable polymeric nanoparticle may have a concentration of about 0.21 wt% to about 1.00 wt% in the base fluid. In addition the clay mineral may be a smectite, a
kaolinite, an illite, a vermiculite, a chlorite or a combination thereof. Furthermore, the base fluid may be water.
In another embodiment of the present invention there is provided a water- based drilling mud, comprising a synthetic degradable polymeric nanoparticle having a plurality of monomers crosslinked by a self degrading crosslinker; a smectite; and water.
In this embodiment the plurality of monomers may comprise 2-acrylamido-2- methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid. Also in this embodiment the self-degrading crosslinker may be an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester. A representative example of a self-degrading crosslinker is /V,/V’-methylenebis(acrylamide). In addition the smectite may be bentonite. Furthermore the synthetic degradable polymeric nanoparticle may have a concentration of about 0.21 wt% to about 1.00 wt% therein.
In yet another embodiment of the present invention there is provided a method for preventing leak-off during a drilling operation, comprising introducing the water-based drilling mud as described supra into a well; and forming a layer of filter cake comprising the synthetic degradable polymeric nanoparticles on a surface of a rock formation in the well, thereby preventing leak off into the rock formation. Further to this embodiment the method comprises self-degrading hydrolytically the synthetic degradable polymeric nanoparticles in the layer into low molecular weight, short-chained polymers to cleanup the filter cake.
In both embodiments the self-degrading step may be controlled by a self degrading crosslinker comprising the synthetic degradable polymeric nanoparticle. Also in both embodiments the self-degrading step may occurs at about 95 °C.
In yet another embodiment of the present invention there is provided a water- based bentonite drilling mud comprising synthetic nanoparticles, each comprising a plurality of monomers copolymerized with a self degrading crosslinker.
In this embodiment each of the synthetic nanoparticles may comprise monomers 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid copolymerized with /V,/V’-methylenebis(acrylamide).
In yet another embodiment of the present invention there is provided a method for automatically cleaning-up filter cake after completion of a drilling process, comprising introducing the water-based bentonite drilling mud as described supra
into a well during the drilling process, the synthetic nanoparticles reducing fluid loss from the filter cake formed during said drilling process and the synthetic nanoparticles self-degrading via hydrolysis of the self-degrading crosslinkers therein after completion of the drilling process.
Provided herein are drilling muds and methods to prevent leak-off or fluid loss during drilling operations. Particularly, the composition of the drilling mud provides improved filtration and rheological properties and easy cleanup. Moreover, preventing leak-off further prevents formation rock damage and facilitates an easy clean up of the filter cake formed on the rock surface. Generally, the drilling mud is water-based and comprises a degradable fluid loss additive.
More particularly, the degradable fluid loss additive may be a synthetic degradable polymeric nanoparticle which improves the performance of water-based drilling muds by providing effective leakoff control during drilling operations. When added to the drilling mud the degradable polymeric nanoparticles improve filtration properties and facilitate easy filter cake cleanup by self degrading at the end of the drilling process. The cost to manufacture the degradable polymeric nanoparticles is low and they are a cost effective alternative for the current expensive, non- degradable solid or polymeric particles as fluid loss additives.
Components of the drilling mud may be those known and standard in the art. For example, a clay mineral may comprise the drilling mud. Non-limiting examples of a drilling mud may comprise a smectite, a kaolinite, an illite, a vermiculite, or a chlorite, or a combination thereof. A representative example of a drilling mud may comprise the degradable polymeric nanoparticles and bentonite.
The degradable polymeric nanoparticle has the benefits of being both an effective fluid loss additive and self degrading to automatically breakdown the filter cake at the end of the drilling process. This is achieved through the hydrolysis of the degradable crosslinkers in the nanoparticle. The nanoparticle may be prepared by a two-step method. In the first step a cross-linked polymeric gel is synthesized by copolymerizing monomers and degradable crosslinkers in the presence of an initiator and a chain transfer agent in water. In the second step the nanoparticles are formed from the crosslinked polymeric gel via the application of high shear rates as is known and standard in the art. The final particle size can be controlled by varying
the shear rate and shear time. The delay in filter cake breakdown is controlled by using different degradable crosslinkers.
The synthetic degradable polymeric nanoparticles when formed as filter cake on the rock subsequently self-degrade via hydrolysis into low molecular weight short chain polymers for easy cleanup. The degradable crosslinker comprising the gel determines the rate of hydrolysis of the polymer and, thus, the delay in filter cake breakdown. The concentration of the synthetic degradable polymeric nanoparticles in the drilling mud correlates to the desired filtration and rheological properties. A change in the desired filtration and rheological properties is achieved by adjusting the concentration of the degradable nanoparticles in the mud.
Crosslinkers with a slow rate of degradation at high or elevated temperatures, for example, about 95 °C, are utilized for high temperature applications to delay the filter cake breakdown until the completion of the drilling operations. Representative crosslinkers in this class include, but are not limited to, acrylamide or methacrylamide compounds, for example, methylene biacrylamide. For lower temperature applications, i.e. lower than about 95 °C, crosslinkers able to degrade at lower temperature are utilized. Representative crosslinkers in this class include, but are not limited to, acrylate or methacrylate ester compounds, for example, polyethylene glycol (PEG) 200-1000 diacrylate.
The following examples are given for the purpose of illustrating various embodiments of the invention and are not meant to limit the present invention in any fashion.
EXAMPLE 1
Methods and Materials
Preparation of degradable polymeric nanoparticles as a fluid loss additive of water- based drilling mud
As shown in the synthetic scheme, the monomers 2-acrylamido-2- methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid and the crosslinker /V,/V’-methylenebis(acrylamide) are copolymerized in water in the presence of the chain transfer agent thioglycolic acid and the initiator VAZO 56 to produce the polymeric gel. The chain transfer agent (CTA) controls the polymer molecular weight. The polymeric gel is subjected to shear to produce the nanoparticles. The nanoparticles degrade to short polymer chains while exposed at a high temperature of 95 °C due to the use of the CTA to control polymer molecular during polymerization. Table 1 identifies the components and amounts in the synthetic scheme.
Preparation of drilling mud
Drilling mud is prepared by an OFITE’s Model 20 Constant Speed Blender according to API requirement (Recommended practice API 3B-1, 2017). Preparation of drilling mud for general study:
459.27 g of RO water, 14.05 g of polymeric gel and 25.00 g of bentonite are added into a blending cup. Blending is carried out at 10000 rpm for 10 minutes according to API requirement. 10% NaOH is added to adjust pH to 9.5~9.8 while stirring. In the prepared drilling mud [Bentonite] = 5.00% and [nanoparticle] = 0-1.00%.
Preparation of drilling mud for the nanoparticle degradation study:
43.14 g of polymeric gel in 257.26 g of water is blended at 10000 rpm for 10 minutes to obtain nanoparticles. Nanoparticles are incubated in a flask at 95 °C while stirring. Bentonite and nanoparticles with incubated in water for 10 days, 20 days and 30 days are blended at 10000 rpm for 10 minutes. In the prepared drilling mud [Bentonite] = 5.00% and [nanoparticle] = 0.61%.
Preparation of drilling mud for ageing study (API 3B-1, 2017): Polymeric gel and bentonite in water are blended at 10000 rpm for 10 minutes. The resultant drilling mud is aged in a flask in a 95 °C or a 120 °C oil bath while stirring for 24 hours. In the prepared drilling mud [Bentonite] = 5.00% and [nanoparticle] = 0.61%. Measurement of rheological properties of drilling mud
Rheological properties of drilling muds are measured by an OFITE’s Model 900 Viscometer at room temperature, according to the API standard Recommended Practice API 3B-1, 2017.
Measurement of fluid loss of drilling mud
Fluid loss is measured by OFITE’s HTHP Filter Press equipment with OFITE filter paper, according to the API standard Recommended Practice API 3B-1, 2017. In each experiment, about 500 ml_ drilling fluid is prepared. Pressure of the OFITE Press cell is provided by a nitrogen (N2) gas charger. The cell and fluid collector pressures at experiments performed at different temperatures are summarized in Table 2. For each experiment, the fluid loss was collected and recorded at 0.5, 1.0, 5.0, 7.5, 15 and 30 minutes.
Measurement of nanoparticle size and Zeta potential
Measurement of nanoparticle size and Zeta potential is performed by a NanoBrook Omni Nanoanalyzer. Nanoparticles are prepared in RO water by blending polymeric gel at 10000 rpm for 10 minutes. Samples are prepared by diluting 1-3 drops of the nanoparticle solution in a cuvette to approximately 4 mL with RO water or 2% NaCI. Size measurements are taken at a scattering angle of 90 C° and a temperature of 25 °C. Samples for Zeta potential measurements are prepared by diluting 1 drop of nanoparticles in a cuvette with 1.25 mL of 1 mM KOI or 2% NaCI. Zeta potential is measured using the phase analysis light scattering (PALS) technique.
EXAMPLE 2
Results
Effect of salinity on particle size and Zeta potential
As shown in Table 1, the size of the nanoparticles (NP) was smaller in 2% NaCI than in RO water due to the shielding effect of the sodium ions. The Zeta potential was much smaller in higher salt concentrations (2% NaCI vs. 1 mM KCI). The effect of salinity on size and Zeta potential of nanoparticles is shown in Table 3.
TABLE 3
The effect of nanoparticle concentration on fluid loss The addition of nanoparticles significantly improved the filtration property of drilling mud. Fluid lossApi decreased with increasing NP concentration (FIG. 1A). Comparing with no NP added, increasing NP concentration from 0.2 - 1.0 wt% resulted in fluid loss reduction from 30% to 60% at 25 °C and from 20% to 50% at 95 °C, respectively (FIG. 1B).
The effect of temperature on fluid loss
The addition of 0.61% NP to bentonite mud significantly improved its filtration property with improvement observed over a temperature range from 25 to 120 °C (FIG. 2).
The effect of nanoparticle concentration on rheological properties at ambient temperature
The nanoparticle concentration and rheological properties at ambient temperature are shown in Table 4. The addition of nanoparticles has no significant impact on the rheological properties of drilling mud except at high nanoparticular concentration of 1%.
The nanoparticle concentration and rheological properties at various temperatures are shown in Table 5. There is no significant impact on rheological properties observed at temperatures ranging from 25 °C to 80 °C by adding 0.61% nanoparticles.
Effect of NaCI on filtration and rheological properties
The addition of nanoparticles significantly improved filtration properties (fluid loss) in 2% NaCI at 95 °C (FIG. 3). The nanoparticle concentration and rheological properties at 25 °C are shown in Table 6. The addition of nanoparticles at different concentrations at 25 °C had little effect on the rheological properties.
FIG. 4 shows that fluid loss returns to levels without nanoparticles after incubating 30 days at 95 °C indicating that the nanoparticles self degrade into linear, short chain polymer. Nanoparticle self degradation over a 30 day period is shown in Table 7. Nanoparticle self degradation can facilitate easy cleanup with minimal formation damage after drilling operations.
The following references are cited herein.
1. Audibert et al. “Role of Polymers on Formation Damage”, SPE 54767,
1999.
2. Nasr-EI-Din et al. An Effective Fluid Formulation to Remove Drilling-Fluid Mudcacke in Horizontal and Multilateral Wells, March 2007 SPE Drilling & Completion,
3. Cole et al., A New Environmentally Safe Crosslinked Polymer for Fluid- Loss Control, SPE 29525, 1995.
Claims
1. A drilling mud comprising: a degradable fluid loss additive; a clay mineral; and a base fluid.
2. The drilling mud of claim 1, wherein the degradable fluid loss additive is a synthetic degradable polymeric nanoparticle.
3. The drilling mud of claim 2, wherein the synthetic degradable polymeric nanoparticle comprises a plurality of monomers cross-linked by a self-degrading crosslinker.
4. The drilling mud of claim 3, wherein the plurality of monomers comprises 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid.
5. The drilling mud of claim 3, wherein the self-degrading crosslinker is an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester.
6. The drilling mud of claim 2, wherein the synthetic degradable polymeric nanoparticle has a concentration of about 0.21 wt% to about 1.00 wt% in the base fluid.
7. The drilling mud of claim 1, wherein the clay mineral is a smectite, a kaolinite, an illite, a vermiculite, a chlorite or a combination thereof.
8. The drilling mud of claim 1 , wherein the base fluid is water.
9. A water-based drilling mud, comprising: a synthetic degradable polymeric nanoparticle having a plurality of monomers crosslinked by a self degrading crosslinker;
a smectite; and water.
10. The water-based drilling mud of claim 9, wherein the plurality of monomers comprises 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid.
11. The water-based drilling mud of claim 9, wherein the self-degrading crosslinker is an acrylamide, a methacrylamide, an acrylate, or a methacrylate ester.
12. The water-based drilling mud of claim 9, wherein the smectite is bentonite.
13. The water-based drilling mud of claim 9, wherein the synthetic degradable polymeric nanoparticle has a concentration of about 0.21 wt% to about 1.00 wt% therein.
14. A method for preventing leak-off during a drilling operation, comprising: introducing the water-based drilling mud of claim 9 into a well; and forming a layer of filter cake comprising the synthetic degradable polymeric nanoparticles on a surface of a rock formation in the well, thereby preventing leak off into the rock formation.
15. The method of claim 14, further comprising self-degrading hydrolytically the synthetic degradable polymeric nanoparticles in the layer into low molecular weight, short-chained polymers to cleanup the filter cake.
16. The method of claim 14, wherein the self-degrading step is controlled by a self-degrading crosslinker comprising the synthetic degradable polymeric nanoparticle.
17. The method of claim 14, wherein the self-degrading step occurs at about 95 °C.
18. A water-based bentonite drilling mud comprising synthetic nanoparticles, each comprising a plurality of monomers copolymerized with a self degrading crosslinker.
19. The water-based bentonite drilling mud of claim 18, wherein each of the synthetic nanoparticles comprises monomers 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPS) and methacrylic acid copolymerized with N,N’~ methylenebis(acrylamide).
20. A method for automatically cleaning-up filter cake after completion of a drilling process, comprising: introducing the water-based bentonite drilling mud of claim 18 into a well during the drilling process, said synthetic nanoparticles reducing fluid loss from the filter cake formed during said drilling process and said synthetic nanoparticles self degrading via hydrolysis of the self-degrading crosslinkers therein after completion of the drilling process.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5837654A (en) * | 1997-05-06 | 1998-11-17 | Southern Clay Products, Inc. | High temperature environmentally benign drilling fluid, and viscosifying additives for use therewith |
CN101260290A (en) * | 2008-01-10 | 2008-09-10 | 韩一波 | Environmental-friendly type drilling fluid (EFD) |
CN109762541A (en) * | 2019-01-07 | 2019-05-17 | 西南石油大学 | A kind of drilling fluid micro-nano compound leakage stop agent and preparation method thereof and drilling fluid and its application |
CN110082271A (en) * | 2018-01-26 | 2019-08-02 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid nano particle closure effect evaluation method |
CN111334265A (en) * | 2020-04-13 | 2020-06-26 | 西南石油大学 | Clay mineral nano hydrogel plugging agent and water-based drilling fluid |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4561985A (en) * | 1982-06-28 | 1985-12-31 | Union Carbide Corporation | Hec-bentonite compatible blends |
US5407909A (en) * | 1992-07-15 | 1995-04-18 | Kb Technologies, Ltd. | Earth support fluid composition and method for its use |
US7829507B2 (en) * | 2003-09-17 | 2010-11-09 | Halliburton Energy Services Inc. | Subterranean treatment fluids comprising a degradable bridging agent and methods of treating subterranean formations |
GB0711621D0 (en) | 2007-06-18 | 2007-07-25 | 3M Innovative Properties Co | Additive to reduce fluid loss for drilling fluids |
US8685900B2 (en) | 2009-04-03 | 2014-04-01 | Halliburton Energy Services, Inc. | Methods of using fluid loss additives comprising micro gels |
US8376045B2 (en) * | 2010-06-17 | 2013-02-19 | Halliburton Energy Services, Inc. | Fluid loss additive containing a biodegradable grafted copolymer for a cement composition |
US8822386B2 (en) | 2010-06-28 | 2014-09-02 | Baker Hughes Incorporated | Nanofluids and methods of use for drilling and completion fluids |
US9006151B2 (en) | 2011-09-12 | 2015-04-14 | Saudi Arabian Oil Company | Water-based drilling fluid composition having a multifunctional mud additive for reducing fluid loss during drilling |
MX2014009562A (en) | 2012-02-09 | 2015-01-26 | Nfluids Inc | Novel nanoparticle-containing drilling fluids to mitigate fluid loss. |
AU2013408844B2 (en) * | 2013-12-26 | 2017-08-31 | Halliburton Energy Services, Inc. | Fluid loss additive for water based drilling fluids with improved thermal stability |
GB2543186B (en) * | 2014-08-06 | 2021-11-03 | Halliburton Energy Services Inc | Diverter composition including rheologically-modified invert emulsion |
US10508229B2 (en) * | 2014-12-22 | 2019-12-17 | Halliburton Energy Services, Inc. | Crosslinked polymers including sulfonic acid groups or salts or esters thereof as viscosifiers and fluid loss additives for subterranean treatment |
WO2016140698A1 (en) * | 2015-03-03 | 2016-09-09 | Halliburton Energy Services, Inc. | Drilling fluids with crosslinked sulfonate-containing polymers dispersed in high density brines |
CN105694830B (en) * | 2016-03-14 | 2018-06-19 | 中国石油集团渤海钻探工程有限公司 | A kind of organic salt drilling fluid |
US10745607B2 (en) | 2016-08-03 | 2020-08-18 | Schlumberger Norge As | Biodegradable additive suitable for use in wellbore fluids |
CN107629768B (en) * | 2017-09-27 | 2021-01-08 | 浙江海洋大学 | Ultrahigh-temperature-resistant water-based drilling fluid |
-
2020
- 2020-09-18 US US17/026,016 patent/US11692120B2/en active Active
- 2020-09-18 EP EP20864516.8A patent/EP4031636A4/en not_active Withdrawn
- 2020-09-18 WO PCT/US2020/051641 patent/WO2021055859A1/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5837654A (en) * | 1997-05-06 | 1998-11-17 | Southern Clay Products, Inc. | High temperature environmentally benign drilling fluid, and viscosifying additives for use therewith |
CN101260290A (en) * | 2008-01-10 | 2008-09-10 | 韩一波 | Environmental-friendly type drilling fluid (EFD) |
CN110082271A (en) * | 2018-01-26 | 2019-08-02 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid nano particle closure effect evaluation method |
CN109762541A (en) * | 2019-01-07 | 2019-05-17 | 西南石油大学 | A kind of drilling fluid micro-nano compound leakage stop agent and preparation method thereof and drilling fluid and its application |
CN111334265A (en) * | 2020-04-13 | 2020-06-26 | 西南石油大学 | Clay mineral nano hydrogel plugging agent and water-based drilling fluid |
Non-Patent Citations (1)
Title |
---|
See also references of EP4031636A4 * |
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US11692120B2 (en) | 2023-07-04 |
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