NO343087B1 - Seawater-based, particle-free, environmentally friendly drilling and completion fluids - Google Patents
Seawater-based, particle-free, environmentally friendly drilling and completion fluids Download PDFInfo
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- NO343087B1 NO343087B1 NO20111305A NO20111305A NO343087B1 NO 343087 B1 NO343087 B1 NO 343087B1 NO 20111305 A NO20111305 A NO 20111305A NO 20111305 A NO20111305 A NO 20111305A NO 343087 B1 NO343087 B1 NO 343087B1
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- Prior art keywords
- drilling
- seawater
- completion
- particle
- free
- Prior art date
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- 238000005553 drilling Methods 0.000 title claims abstract description 111
- 239000012530 fluid Substances 0.000 title claims abstract description 99
- 239000013535 sea water Substances 0.000 title claims abstract description 55
- 239000000706 filtrate Substances 0.000 claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 15
- 239000003112 inhibitor Substances 0.000 claims abstract description 14
- 238000002386 leaching Methods 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000003223 protective agent Substances 0.000 claims abstract description 11
- 239000003755 preservative agent Substances 0.000 claims abstract description 7
- 230000002335 preservative effect Effects 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 235000002639 sodium chloride Nutrition 0.000 claims description 15
- 229920000642 polymer Polymers 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 12
- 238000005260 corrosion Methods 0.000 claims description 12
- 239000000314 lubricant Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000013530 defoamer Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 229920002545 silicone oil Polymers 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 150000001298 alcohols Chemical class 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 239000000230 xanthan gum Substances 0.000 claims description 7
- 229920001285 xanthan gum Polymers 0.000 claims description 7
- 235000010493 xanthan gum Nutrition 0.000 claims description 7
- 229940082509 xanthan gum Drugs 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- NHFDKKSSQWCEES-UHFFFAOYSA-N dihydrogen phosphate;tris(2-hydroxyethyl)azanium Chemical compound OP(O)(O)=O.OCCN(CCO)CCO NHFDKKSSQWCEES-UHFFFAOYSA-N 0.000 claims description 3
- 235000011187 glycerol Nutrition 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- RLGCXRKUEUCYIY-UHFFFAOYSA-M trimethyl(prop-1-enyl)azanium chloride Chemical compound [Cl-].CC=C[N+](C)(C)C RLGCXRKUEUCYIY-UHFFFAOYSA-M 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000001103 potassium chloride Substances 0.000 claims description 2
- 235000011164 potassium chloride Nutrition 0.000 claims description 2
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 235000019198 oils Nutrition 0.000 description 17
- 239000004927 clay Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 231100000252 nontoxic Toxicity 0.000 description 7
- 230000003000 nontoxic effect Effects 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000002401 inhibitory effect Effects 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000009671 shengli Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 239000004280 Sodium formate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000015784 hyperosmotic salinity response Effects 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 2
- 235000019254 sodium formate Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009967 tasteless effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- VNDYJBBGRKZCSX-UHFFFAOYSA-L zinc bromide Chemical compound Br[Zn]Br VNDYJBBGRKZCSX-UHFFFAOYSA-L 0.000 description 2
- -1 Ca<2+> Chemical class 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical group OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001622 calcium bromide Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000004675 formic acid derivatives Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 239000000594 mannitol Substances 0.000 description 1
- 235000010355 mannitol Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 150000002892 organic cations Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
- 229940102001 zinc bromide Drugs 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
- C09K8/06—Clay-free compositions
-
- 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
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
-
- 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
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
Abstract
Foreliggende oppfinnelse vedrører sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluider benyttet på fagområdet for bore- og kompletteringsoperasjoner ved boring etter offshore olje og gass, spesielt på området for ikke-perforerende boring- og kompletteringsoperasjoner. De vedrørende sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene består essensielt av de følgende komponentene: a) rent sjøvann, b) et saltresistent og viskositetsøkende filtratreduksjonsmiddel, c) en utvaskingshemmer, d) eventuelt, et bore- og kompletteringsfluidsmøremiddel, e) eventuelt, et reservoarbeskyttende middel, f) et bore- og kompletteringsfluidpreserveringsmiddel, g) eventuelt, en pHregulator, og h) eventuelt, et bore- og kompletteringsfluidskumdempemiddel.The present invention relates to seawater-based, particle-free, environmentally friendly drilling and completion fluids used in the field of drilling and completion operations in offshore oil and gas drilling, especially in the area of non-perforating drilling and completion operations. The seawater-based, particle-free, environmentally friendly drilling and completion fluids essentially consist of the following components: a) pure seawater, b) a salt-resistant and viscosity-increasing filtrate reducing agent, c) a leaching inhibitor, d) optionally, a drilling and supplementing fluid, a reservoir protecting agent; f) a drilling and completion fluid preservative; g) optionally, a pH regulator; and h) optionally, a drilling and completion fluid antifoaming agent.
Description
Teknisk område Technical area
Foreliggende oppfinnelse vedrører sjøvannsbaserte, partikkelfrie (faststoffrie), miljøvennlige bore- og kompletteringsfluider benyttet på fagområdet for bore- og kompletteringsoperasjoner i utnyttelsen av olje og gass offshore, spesielt på området for ikke-perforeringsboring og kompletteringsoperasjoner. The present invention relates to seawater-based, particle-free (solids-free), environmentally friendly drilling and completion fluids used in the field of drilling and completion operations in the exploitation of oil and gas offshore, especially in the area of non-perforation drilling and completion operations.
Kjent teknikk Known technique
Bore- og kompletteringsfluider er fluider som er klargjort ved å benytte en mengde råmaterialer og kjemiske tilsetningsstoffer, som holder seg i kontakt med olje- og gassonen under prosessene med boring og komplettering. Bore- og kompletteringsfluider bør imøtekomme en mengde prosesskrav, miljømessige krav, og bør samtidig være i stand til å beskytte reservoaret, og forhindre at fastfasekaks eller borekaks blokkerer strupen (innløpet). De bør også forhindre at filtratet invaderer reservoaret og dermed interagere med reservoarkomponentene og slik forårsake effekter slik som leirekspansjon, partikkelmigrering og så videre, noe som blokkerer reservoaret, eller som blokkerer reservoaret med sedimentene som skyldes interaksjonen med fluidet i reservoaret. Bore- og kompletteringsfluider bør levere et visst fluidkolonnetrykk for å balansere formasjonsbelastningen og stabilisere brønnveggen, for slik å forhindre brønnspark og brønnutblåsning forårsaket av fluidinvasjon inn i brønnen. Videre bør de også sikre effektiv rensing av brønnhullet ved å frakte ut borekaks og suspendert materiale. Drilling and completion fluids are fluids prepared by using a quantity of raw materials and chemical additives, which stay in contact with the oil and gas zone during the processes of drilling and completion. Drilling and completion fluids should meet a multitude of process requirements, environmental requirements, and at the same time should be able to protect the reservoir, and prevent solid-phase cuttings or drilling cuttings from blocking the throat (inlet). They should also prevent the filtrate from invading the reservoir and thus interacting with the reservoir components and thus causing effects such as clay expansion, particle migration and so on, which block the reservoir, or which block the reservoir with the sediments resulting from the interaction with the fluid in the reservoir. Drilling and completion fluids should deliver a certain fluid column pressure to balance the formation load and stabilize the well wall, thus preventing well kick and well blowout caused by fluid invasion into the well. Furthermore, they should also ensure effective cleaning of the wellbore by transporting out drilling cuttings and suspended material.
På fagområdet for bore- og kompletteringsoperasjoner blir bore- og kompletteringsfluider med faste stoffer vanlig benyttet per i dag. Det grunnleggende prisnippet for anvendelse av den skjermende, midlertidige pluggingsteknikken for å beskytte olje- og gassonen er å benytte loven for midlertidige plugging for faste partikler: en tynn, kompakt beskyttelsesring med en svært lav permeabilitet, en tykkelse som kan bli perforert av en perforerende kule og enkel for utførelse av oppløsningsprosessering blir dannet nær brønnveggen i løpet av den svært korte tiden når reservoaret åpnes ved boring, for å forhindre at borekompletteringsfluidene invaderer og forurenser formasjonen for å oppnå formålet med olje- og gassonebeskyttelse. Når det gjelder reservoaret med benyttelsen av de ikke-perforerende bore- og kompletteringsoperasjonene så er ikke den skjermende, midlertidige pluggingsteknikken anvendbar for olje- og gassonebeskyttelse, men i stedet bør faststoffrie bore- og kompletteringsfluider bli benyttet for å beskytte olje- og gassonen. Spesielt krever offshore oljeutvinning og –utvikling at bore- og kompletteringsfluider bør ha konvensjonelle egenskaper slik som tetthet, surhet og alkaliskhet, filtrat, reologiske egenskap, stabilitet, i tillegg til kravene lav eller ikke-toksisitet og miljømessig ufarlighet for bore- og kompletteringsfluidene osv. In the field of drilling and completion operations, drilling and completion fluids with solids are commonly used as of today. The basic tip for applying the shielding temporary plugging technique to protect the oil and gas zone is to use the law of temporary plugging for solid particles: a thin, compact protective ring with a very low permeability, a thickness that can be perforated by a perforating ball and easy to perform dissolution processing is formed near the well wall during the very short time when the reservoir is opened by drilling, to prevent the drilling completion fluids from invading and contaminating the formation to achieve the purpose of oil and gas zone protection. As for the reservoir using the non-perforating drilling and completion operations, the shielding, temporary plugging technique is not applicable for oil and gas zone protection, but instead solids-free drilling and completion fluids should be used to protect the oil and gas zone. In particular, offshore oil extraction and development requires that drilling and completion fluids should have conventional properties such as density, acidity and alkalinity, filtrate, rheological properties, stability, in addition to the requirements of low or non-toxicity and environmental harmlessness for the drilling and completion fluids, etc.
For å kunne imøtekomme de stadig strengere miljøkravene offshore, og behovet for å redusere kostnaden for bore- og kompletteringsfluider, så må bore- og kompletteringsfluider ha god miljømessig aksept, og ha sjøvann som den kontinuerlige fasen for å unngå økningen i kostnaden for bore- og kompletteringsfluider som påløper ved transport av ferskvann til offshore boreplattformene. Dersom ferskvann blir benyttet som den kontinuerlige fasen vil kostnaden for bore- og kompletteringsfluidene være svært høy (1 m<3>ferskvann koster opptil flere titalls Yuan (RMB) og hver fot som bores krever omtrent 2,02 m<3>vann, og vannleveringen i stor skala kan forstyrres på grunn av værpåvirkning.) Dersom sjøvann benyttes er et stort antall uorganiske kationer slik som Ca<2+>, Mg<2+>og Na<2+>i sjøvann nyttige for å forbedre brønnveggstabiliteten. In order to meet the increasingly strict environmental requirements offshore, and the need to reduce the cost of drilling and completion fluids, drilling and completion fluids must have good environmental acceptance, and have seawater as the continuous phase to avoid the increase in the cost of drilling and completion fluids incurred during the transport of fresh water to the offshore drilling platforms. If fresh water is used as the continuous phase, the cost of the drilling and completion fluids will be very high (1 m<3>of fresh water costs up to tens of Yuan (RMB) and each foot drilled requires approximately 2.02 m<3>of water, and the water supply on a large scale can be disrupted due to weather influences.) If seawater is used, a large number of inorganic cations such as Ca<2+>, Mg<2+> and Na<2+> in seawater are useful for improving well wall stability.
De vanlig anvendte partikkelfrie bore- og kompletteringsfluidene inkluderer boreog kompletteringsfluidene av ren saltoppløsning av uorganiske salter som i hovedsak er sammensatt av ren saltoppløsning av uorganiske salter og en leirestabilisator og de partikkelfrie bore- og kompletteringsfluidene av polymer og format. De uorganiske saltkomponentene i bore- og kompletteringsfluidene av ren saltoppløsning av uorganiske salter, slik som natriumklorid, ammoniumklorid, kalsiumklorid, kalsiumbromid, sinkbromid osv., har ganske store korroderende effekter og skader dermed i stor grad nedihullsfasiliteter, rørledninger, pumper osv., og uorganiske saltkomponenter har en tendens til å krystallisere, blokkere formasjon, og noen systemer omfatter toksiske komponenter som er skadelige for mennesker og miljøet. The commonly used particle-free drilling and completion fluids include the drilling and completion fluids of pure saline solution of inorganic salts which are essentially composed of pure saline solution of inorganic salts and a clay stabilizer and the particle-free drilling and completion fluids of polymer and formate. The inorganic salt components in the drilling and completion fluids of pure brine of inorganic salts, such as sodium chloride, ammonium chloride, calcium chloride, calcium bromide, zinc bromide, etc., have quite large corrosive effects and thus greatly damage downhole facilities, pipelines, pumps, etc., and inorganic salt components tend to crystallize, block formation, and some systems include toxic components that are harmful to humans and the environment.
Patentsøknaden CN 2008 10049256.6 tilkjennegir også høytemperaturresistente og saltresistente partikkelfrie bore- og kompletteringsfluider fremstilt fra vann, format, klebemiddel, filtreringstapsreduserende middel, oljelagsbeskyttende middel og polymeralkohol anti-utvaskingsmiddel, men fluidene er ikke sjøvannsbaserte, partikkelfrie bore- og kompletteringsmidler. The patent application CN 2008 10049256.6 also discloses high-temperature resistant and salt-resistant particle-free drilling and completion fluids made from water, formate, adhesive, filtration loss reducing agent, oil layer protective agent and polymer alcohol anti-leaching agent, but the fluids are not seawater-based, particle-free drilling and completion fluids.
De nevnte, nåværende, partikkelfrie bore- og kompletteringsfluidene lider av problemer med korrosjon og skumdannelse i kompletteringsoperasjonene innen fagfeltet for offshore oljeutvinning og -utvikling. De nåværende bore- og kompletteringsfluidene kan ikke løse disse problemene. The aforementioned, current, particle-free drilling and completion fluids suffer from problems with corrosion and foam formation in the completion operations in the field of offshore oil extraction and development. The current drilling and completion fluids cannot solve these problems.
US 2006/0019834 beskriver partikkelfrie, klare borefluider som eksempelvis deionisert vann, KCl/sjø saltvann og natrium klorid-mettet vann. US 2006/0019834 describes particle-free, clear drilling fluids such as deionized water, KCl/sea salt water and sodium chloride-saturated water.
YUE QIANSHENG et al., Petroleum Exploration and Development, vol. 37(2): 232-236 beskriver sjøvannsbasert, faststoff-fritt borefluider. YUE QIANSHENG et al., Petroleum Exploration and Development, vol. 37(2): 232-236 describes seawater-based, solids-free drilling fluids.
US 2007/0197399 beskriver fluider inneholdende skumdemper. US 2007/0197399 describes fluids containing foam suppressors.
Beskrivelse av oppfinnelsen Description of the invention
Foreliggende oppfinnelse har som formål å tilveiebringe et sjøvannsbasert, partikkelfritt, miljøvennlig bore- og kompletteringsfluid der de benyttede komponentene alle er miljøvennlige. Slike sjøvannsbaserte, partikkelfrie miljøvennlige bore- og kompletteringsfluider er hensiktsmessige for offshore oljeog gassboreoperasjoner og -kompletteringsoperasjoner, spesielt ikke-perforerende bore- og kompletteringsoperasjoner. Det ikke bare optimaliserer egenskapene for bore- og kompletteringsfluidene, men oppnår også effektene med å beskytte reservoaret, beskytte miljøet og forbedre utnyttelsesgraden av offshore olje- og naturgassressurser. The purpose of the present invention is to provide a seawater-based, particle-free, environmentally friendly drilling and completion fluid where the components used are all environmentally friendly. Such seawater-based, particle-free environmentally friendly drilling and completion fluids are suitable for offshore oil and gas drilling and completion operations, especially non-perforating drilling and completion operations. It not only optimizes the properties of the drilling and completion fluids, but also achieves the effects of protecting the reservoir, protecting the environment and improving the utilization rate of offshore oil and natural gas resources.
De sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene beskrevet heri inneholder fortrinnsvis essensielt de følgende komponentene: The seawater-based, particle-free, environmentally friendly drilling and completion fluids described herein preferably essentially contain the following components:
a) rent sjøvann, a) clean seawater,
b) et saltresistent og viskositetsøkende filtratreduksjonsmiddel, b) a salt-resistant and viscosity-increasing filtrate reducing agent,
c) en utvaskingshemmer, c) a leaching inhibitor,
d) eventuelt, et bore- og kompletteringsfluidsmøremiddel, d) optionally, a drilling and completion fluid lubricant,
e) eventuelt, et reservoarbeskyttende middel, e) possibly, a reservoir protective agent,
f) et bore- og kompletteringsfluidpreserveringsmiddel (også kjent som bore- og kompletteringsfluidkorrosjonshemmere), f) a drilling and completion fluid preservative (also known as drilling and completion fluid corrosion inhibitors),
g) eventuelt, en pH-regulator, og g) optionally, a pH regulator, and
h) eventuelt, et bore- og kompletteringsfluidskumdempemiddel. h) optionally, a drilling and completion fluid defoamer.
Blant disse blir det rene sjøvannet i a) benyttet som en kontinuerlig fase (også kjent som den grunnleggende væsken i det sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidet), og det referer fortrinnsvis til det rene sjøvannet som oppnås ved å filtrere gjennom et sjøvannsfilter med en filterkjerneporestørrelse på ≤ 5 μm, fortrinnsvis ≤ 3 μm. Sjøvannet er enkelt og billig tilgjengelig. Videre er sjøvannet stabilt og miljøvennlig. Among these, the pure seawater in a) is used as a continuous phase (also known as the basic fluid in the seawater-based, particle-free, environmentally friendly drilling and completion fluid), and it preferably refers to the pure seawater obtained by filtering through a seawater filter with a filter core pore size of ≤ 5 μm, preferably ≤ 3 μm. Seawater is easily and cheaply available. Furthermore, the seawater is stable and environmentally friendly.
Det saltresistente og viskositetsøkende filtratreduksjonsmiddelet i b) er minst ett som fortrinnsvis er valgt fra hydroksyetylcellulose (HEC), xantangummi (XC), natriumkarboksymetylcellulose (CMC) og polyanionisk cellulose (PAC). Den nevnte xantangummien (XC) er smaksløs, ikke-toksisk og har høy trygghetsprofil. The US Food and Drug Administration godkjente anvendelsen av xantangummi i matvarer i 1969. I 1983 godkjente the Food and Agriculture Organization i FN xantangummi som et tilsetningsstoff i matvarer uten å begrenses dens dosering. Xantangummi har høy viskositet, god termisk stabilitet (anvendelsestemperatur: -18 ºC ~ 130 ºC), høye surhets-, alkali- og salttoleranseegenskaper (i stand til å opprettholde de opprinnelige egenskapene ved pH-verdier fra 1 til 12), og mens den foreligger sammen med salter som har høye konsentrasjoner forblir den fremdeles et stabilt fortykningssystem. Den har god suspensjonsegenskap for uløselige, faste partikler og oljedråper, og en unik, reologisk egenskap slik at ved skjærevirkningen så minsker viskositeten i løsningen raskt, men med en gang skjæret frigjøres så vil viskositeten straks endres tilbake. Slike gode egenskaper gjør xantangummi til et utbredt benyttet middel i oljeboring og gruvedrift. Polymerene med medium molekylvekt som blir valgt som det saltresistente og viskositetsøkende filtratreduksjonsmiddelet slik som hydroksyetylcellulose (HEC), natriumkarboksymetylcellulose (CMC), polyanionisk cellulose (PAC) osv., har gode saltresistente og temperaturresistente egenskaper og virker som kontrollmidlene for fortyknings- og filtratreduksjonsegenskapene i systemet. Disse polymerene med medium molekylvekt inneholder et stort antall funksjonelle grupper, slik som hydroksylgrupper (-OH), karboksylgrupper (-COOH), som kan bli adsorbert på overflatene av leirpartikler for å danne absorpsjonslag og dermed øke hydratiseringsskalltykkelsen på leirpartiklene på brønnveggen for å forhindre at leirpartiklene flokkulerer og fortykkes og bindes til større partikler. Som et resultat av dette dannes en tynn, seig mud-masse på brønnveggen. The salt-resistant and viscosity-increasing filtrate reducing agent in b) is at least one preferably selected from hydroxyethyl cellulose (HEC), xanthan gum (XC), sodium carboxymethyl cellulose (CMC) and polyanionic cellulose (PAC). The aforementioned xanthan gum (XC) is tasteless, non-toxic and has a high safety profile. The US Food and Drug Administration approved the use of xanthan gum in foods in 1969. In 1983, the Food and Agriculture Organization of the United Nations approved xanthan gum as an additive in foods without limiting its dosage. Xanthan gum has high viscosity, good thermal stability (use temperature: -18 ºC ~ 130 ºC), high acidity, alkali and salt tolerance properties (capable of maintaining the original properties at pH values from 1 to 12), and while together with salts that have high concentrations, it still remains a stable thickening system. It has good suspension properties for insoluble, solid particles and oil droplets, and a unique, rheological property so that the viscosity of the solution decreases quickly during the cutting action, but as soon as the cutting is released, the viscosity will immediately change back. Such good properties make xanthan gum a widely used agent in oil drilling and mining. The medium molecular weight polymers that are selected as the salt-resistant and viscosity-increasing filtrate reducing agent such as hydroxyethyl cellulose (HEC), sodium carboxymethyl cellulose (CMC), polyanionic cellulose (PAC), etc., have good salt-resistant and temperature-resistant properties and act as the control agents for the thickening and filtrate-reducing properties of the system . These medium molecular weight polymers contain a large number of functional groups, such as hydroxyl groups (-OH), carboxyl groups (-COOH), which can be adsorbed on the surfaces of clay particles to form absorption layers and thus increase the hydration shell thickness of the clay particles on the well wall to prevent the clay particles flocculate and thicken and bind to larger particles. As a result, a thin, tough mud mass forms on the well wall.
Filtermassepermeabiliteten blir redusert, filtrat blir minsket, og imens er den poreblokkerende og filtratviskositetsforbedrende effekten til filtratreduksjonsmiddelet nyttig for filtratreduksjon. Filter mass permeability is reduced, filtrate is reduced, and meanwhile the pore-blocking and filtrate viscosity-improving effect of the filtrate reducing agent is useful for filtrate reduction.
Utvaskingshemmeren c) er minst én som fortrinnsvis er valgt fra vannløselige formater, polyakrylamidkalium (K-PAM), polymer-alkohol anti-utvaskingsmidler, organisk silikon og kaliumklorid. Formater har de følgende tre effektene i bore- og kompletteringsfluider: (1) øker det flytende saltinnholdet i bore- og kompletteringsfluidet, reduserer inntrengningen av vannmolekyler med de todelte effektene av å innlegge de organiske kationene og den elektrostatiske kraften for å forhindre eller redusere den osmotiske hydreringen, for slik å spille rollen som utvaskingshemmer, (2) redusere den frie vannaktiviteten i bore- og kompletteringsfluider slik at dannelsen av vann gjennomgår revers osmose mot brønnhullet og fremmer stabiliteten til brønnveggen; format HCOO-, en polar hydreringsgruppe med et forholdsvis lite volum blir adsorbert på leiroverflaten via hydrogenbindingskrefter, for slik å øke hydreringsskalltykkelsen, og forhindre den ytterligere hydreringen av leire og danne en struktur som tillater at bore- og kompletteringsfluidet har god reologi og stabilitet, (3) har en forholdsvis høy tetthet og virker også som et vektemiddel, god løselighet i vann, rask oppløsning, uovertruffen kompatibilitet og termisk stabilitet. Formatbore- og formatkompletteringsfluidene som slik er formulert er trygge og ikke-toksiske ved anvendelse, godt kompatible med miljøet og lett nedbrytbare, noe som gir en miljøvennlig bore- og kompletteringfluidtilsetning. For det tidligere nevnte polyakrylamidkaliumsaltet blir adsorpsjonsgruppene på polymerene derav absorbert på leire, binder sammen et stort antall leirpartikler og belegger dem. Dette forhindrer leiren fra å dispergere på den ene siden, og forhindrer på den andre siden at vannmolekyler lett kan trenge inn i leirens krystallag og forhindrer leire fra å ekspandere og dispergere på grunn av hydrering, for slik å oppnå utvaskingshemmereffekten. Produktet er en vanlig benyttet ikke-toksisk, ikkekorroderende utvaskingsinhibitor som har de kombinerte effektene av å redusere filtrat, forbedre strømningsmønsteret og øke smøring. Det kan forbedre de reologiske egenskapene til kompletteringsfluider, har god kompatibilitet med andre prosesseringsmidler og sterk anti-temperaturevne (≥ 150 ºC). The leaching inhibitor c) is at least one preferably selected from water-soluble formats, polyacrylamide potassium (K-PAM), polymer-alcohol anti-leaching agents, organic silicone and potassium chloride. Formates have the following three effects in drilling and completion fluids: (1) increase the liquid salt content of the drilling and completion fluid, reduce the penetration of water molecules with the twofold effects of intercalating the organic cations and the electrostatic force to prevent or reduce the osmotic the hydration, so as to play the role of leaching inhibitor, (2) reduce the free water activity in drilling and completion fluids so that the formation of water undergoes reverse osmosis towards the wellbore and promotes the stability of the well wall; format HCOO-, a polar hydration group with a relatively small volume is adsorbed on the clay surface via hydrogen bonding forces, thus increasing the hydration shell thickness, and preventing the further hydration of clay and forming a structure that allows the drilling and completion fluid to have good rheology and stability, ( 3) has a relatively high density and also acts as a weighting agent, good solubility in water, rapid dissolution, unsurpassed compatibility and thermal stability. The format drilling and format completion fluids formulated in this way are safe and non-toxic in use, well compatible with the environment and easily degradable, which provides an environmentally friendly drilling and completion fluid additive. For the previously mentioned polyacrylamide potassium salt, the adsorption groups on the polymers thereof are absorbed on clay, binding together a large number of clay particles and coating them. This prevents the clay from dispersing on the one hand, and on the other hand prevents water molecules from easily penetrating the crystal layer of the clay and prevents the clay from expanding and dispersing due to hydration, thus achieving the anti-leaching effect. The product is a commonly used non-toxic, non-corrosive leaching inhibitor that has the combined effects of reducing filtrate, improving flow pattern and increasing lubrication. It can improve the rheological properties of completion fluids, has good compatibility with other processing agents and strong anti-temperature ability (≥ 150 ºC).
Bore- og kompletteringsfluidsmøremiddelet er minst ett som fortrinnsvis er valgt fra hvit olje, silikonolje og polymer-alkohol smøremidler. Polymer-alkohol smøremidlene kan være polyeter-polyol anti-utvaskingssmøremidler fremskaffet ved kopolymerisering av etylenoksid (EO) og propylenoksid (PO) med lavmolekylvekts-alkoholer som igangsetter, som har en sterkt hemmende effekt og gode smøreegenskaper. De kan vesentlig redusere friksjonskoeffisienten for kompletteringsfluidet, øke styrken for ekstremtrykkfilmen, forbedre filtratevnen til kompletteringsfluidet, har en sterk evne til å beskytte reservoaret og er ikkefluorescerende. De har en EC50-verdi som er høyere enn 1,0 x 10<5>mg/l og er fullstendig ikke-toksiske. Testresultatene for det biologiske oksygenkravet i sjøvann viser at de enkelt brytes ned biologisk. Den ovenfor nevnte hvite oljen kan være flytende olje fremskaffet fra fraksjonene med smørende oljer fra petroleumsolje ved avvoksing, hydrogenering og raffinering og kjemisk raffinering. Fordi den hvite oljen er ikke-toksisk, smaksløs, har lavt nivå av fluorescens og ikke påvirker loggingen av geologisk fluorescens så blir den hyppig benyttet ved oljeboring som kompletteringsfluidsmøremiddelet for å redusere friksjonen mellom veggen og boreredskapet (eller foring), redusere borestrengrotasjonsdreiemoment og motstanden mot å trekke ut av hull og kjøre inn i hull, og forbedre smøringen i kompletteringsfluidet. The drilling and completion fluid lubricant is at least one preferably selected from white oil, silicone oil and polymer-alcohol lubricants. The polymer-alcohol lubricants can be polyether-polyol anti-washout lubricants obtained by copolymerizing ethylene oxide (EO) and propylene oxide (PO) with low molecular weight alcohols as initiators, which have a strong inhibitory effect and good lubricating properties. They can significantly reduce the friction coefficient of the completion fluid, increase the strength of the extreme pressure film, improve the filtration ability of the completion fluid, have a strong ability to protect the reservoir and are non-fluorescent. They have an EC50 value higher than 1.0 x 10<5>mg/l and are completely non-toxic. The test results for the biological oxygen demand in seawater show that they are easily broken down biologically. The above-mentioned white oil can be liquid oil obtained from the fractions with lubricating oils from petroleum oil by dewaxing, hydrogenation and refining and chemical refining. Because the white oil is non-toxic, tasteless, has a low level of fluorescence and does not affect the logging of geological fluorescence, it is frequently used in oil drilling as the completion fluid lubricant to reduce friction between the wall and the drilling tool (or casing), reduce drill string rotation torque and resistance to to pull out of holes and drive into holes, and improve lubrication in the completion fluid.
Det reservoarbeskyttende middelet i e) er minst ett som er valgt fra reservoarbeskyttende midler av modifiserte polymeralkoholer og trimetylpropenylammoniumklorid. Den primære komponenten i det ikkefluorescerende reservoarbeskyttende middelet av modifiserte polymeralkoholer er en ikke-ionisk, mettet karbonkjedepolymer. Fordi hovedmolekylkjedene alle har karbonatomer, og fordi de fleste av sidekjedene er hydroksylgrupper, tillates det at en stor mengde hydrogenbindinger dannes mellom alkoholmolekylene og leirpartikler. I mellomtiden, fordi polymeralkoholer har egenskapen med blakkingspunkt som er justerbart, så er polymeralkoholer løselige i vann når temperaturen er lav, og kan da bli adsorbert på boreredskapet og brønnveggen, og danne en molekylær film i en fase som likner oljefasen for å forbedre smøreevnen til borefluider, og når temperaturen er høyere enn blakkingspunktet blir polymeralkoholer separert fra vann og kan feste seg til brønnveggen for å danne hydrofobe lag, for slik å forbedre kvaliteten på mud-masser og samarbeide med filtratreduksjonsmidler for å danne en tett, glatt filtermasse for å hindre at fuktigheten trenger inn i formasjonen. Derfor har de uovertrufne effekter på forhindring av skiferhydrering og -dispergering, stabilisering av brønnveggen og beskyttelse av reservoaret. Det nevnte trimetylpropenylammoniumkloridet er en liten kationstabilisator. Fordi elektriske dobbeltlag blir dannet på grunn av leirpartiklene som absorberer vann og ekspanderer kan den lille kationstabilisatoren komprimere elektriske dobbeltlag for å unngå ekspansjon, og samtidig forhindre at leire som møter vann fra å løsne fra steinmatriksen noe som blokkerer strupen etter forflytning, for derved å øke permeabiliteten og redusere skaden på reservoaret. The reservoir protecting agent in e) is at least one selected from reservoir protecting agents of modified polymer alcohols and trimethylpropenylammonium chloride. The primary component of the non-fluorescent reservoir-protecting agent of modified polymeric alcohols is a non-ionic, saturated carbon chain polymer. Because the main molecular chains all have carbon atoms, and because most of the side chains are hydroxyl groups, a large amount of hydrogen bonds are allowed to form between the alcohol molecules and clay particles. Meanwhile, because polymer alcohols have the characteristic of flash point which is adjustable, polymer alcohols are soluble in water when the temperature is low, and then can be adsorbed on the drilling tool and the well wall, forming a molecular film in a phase similar to the oil phase to improve the lubricity of drilling fluids, and when the temperature is higher than the flash point, polymer alcohols are separated from water and can adhere to the well wall to form hydrophobic layers, thus improving the quality of mud masses and working with filtrate reducers to form a dense, smooth filter mass to prevent that moisture penetrates into the formation. Therefore, they have unrivaled effects on preventing shale hydration and dispersion, stabilizing the well wall and protecting the reservoir. The aforementioned trimethylpropenylammonium chloride is a small cation stabilizer. Because electrical double layers are formed due to the clay particles absorbing water and expanding, the small cation stabilizer can compress electrical double layers to avoid expansion, while preventing clays encountering water from loosening from the rock matrix blocking the throat after displacement, thereby increasing permeability and reduce damage to the reservoir.
Bore- og kompletteringsfluidpreserveringsmiddelet i f) er minst ett som fortrinnsvis er valgt fra 2-alkyl-N-hydroksyetyl-N-hydroksypropyl-sulfo-imidazolin, trietanolaminfosfat-dihydrofosfat og molybdatkomplekskorrosjonsinhibitorer. The drilling and completion fluid preservative in f) is at least one which is preferably selected from 2-alkyl-N-hydroxyethyl-N-hydroxypropyl-sulfo-imidazoline, triethanolamine phosphate dihydrophosphate and molybdate complex corrosion inhibitors.
2-alkyl-N-hydroksyetyl-N-hydroksypropyl-sulfo-imidazolin kan bli adsorbert på metalloverflater og har gode surhets-, alkali- og salttoleranseegenskaper slik at det effektivt reduserer korrosjonen forårsaket av saltløsning på utstyr. 2-Alkyl-N-hydroxyethyl-N-hydroxypropyl-sulfo-imidazoline can be adsorbed on metal surfaces and has good acidity, alkali and salt tolerance properties so that it effectively reduces the corrosion caused by salt solution on equipment.
Trietanolaminfosfat-dihydrofosfat kan danne et lag med en beskyttende film som har god kjemisk stabilitet på ståloverflaten i naturlig sjøvann slik at det effektivt hemmer korrosjonen av stål i sjøvann. Når konsentrasjonen derav er 135 mg/l – 225 mg/l er den korrosjonshemmende effektiviteten så høy som >99 %. Det har fortrinnet av den lave konsentrasjonen, den høye korrosjonshemmende effektiviteten, den enkle ”chean-up” og enkelt tilgjengelige råmaterialene, ikketoksisitet, ingen forurensing og så videre. Natriummolybdatkomplekskorrosjonshemmer har en god korrosjonshemmende evne på karbonstål med en korrosjonshemmende effektivitet på omtrent 95 % som øker ettersom temperaturen stiger. Triethanolamine phosphate-dihydrophosphate can form a layer with a protective film that has good chemical stability on the steel surface in natural seawater so that it effectively inhibits the corrosion of steel in seawater. When the concentration thereof is 135 mg/l – 225 mg/l, the corrosion-inhibiting efficiency is as high as >99%. It has the advantage of the low concentration, the high corrosion-inhibiting efficiency, the easy "chean-up" and easily available raw materials, non-toxicity, no pollution and so on. Sodium molybdate complex corrosion inhibitor has a good corrosion inhibitory ability on carbon steel with a corrosion inhibitory efficiency of about 95% which increases as the temperature rises.
pH- regulatoren i g) er minst én som fortrinnsvis er valgt fra kaliumhydroksid (KOH), natriumhydroksid (NaOH), natriumkarbonat (Na2CO3) for anvendelse i justering av pH-verdier for bore- og kompletteringsfluider til området på fra 7 til 11, fortrinnsvis fra 8 til 10. The pH regulator in g) is at least one which is preferably selected from potassium hydroxide (KOH), sodium hydroxide (NaOH), sodium carbonate (Na2CO3) for use in adjusting pH values for drilling and completion fluids to the range of from 7 to 11, preferably from 8 to 10.
Bore- og kompletteringsfluidskumdempemiddelet i h) er minst ett som fortrinnsvis er valgt fra glyserinpolyeter, emulgert silikonolje, dimetylsilikonolje og skumdemper 7501 (Defoamer 7501). Glyserinpolyeter, også kjent som trihydroksypolyeter eller polyetertriol, som har en molekylvekt på 3000 ± 300, er en fargeløs eller lysegul, transparent, viskøs væske som er ikke-toksisk med en relativ tetthet (20 ºC/4 ºC) på 1,004 ~ 1,005, et flammepunkt på 268 ºC, en viskositet (25 ºC) på 470 ~ 520 mPa·s, er uløselig i vann men løselig i etanol, benzen og andre organiske løsningsmidler. Dimetylsilikonolje, som er fargeløs og transparent, er et nytt, syntetisk polymermateriale som har et høyt flammepunkt og lavt frysepunkt, som kan bli benyttet ved en temperatur på -50 ºC ~ 200 ºC i lang tid. Den har en liten viskositet-temperaturkoeffisient, høy kompresjonsrate, lav overflatespenning og er ikke løselig i vann, animalske og vegetabilske oljer og mineraloljer med høyt kokepunkt, med god kjemisk stabilitet og er ikke-toksisk. Den har blitt benyttet hyppig som et skumdempemiddel i petroleumsoljeindustrien, kjemisk industri, medisinsk industri, farmasøytisk industri og matvareprosessindustri. Den emulgerte silikonoljen er en rent hvit emulsjon med nøytral pH, liten overflatespenning, en vid vannkontaktvinkel, god smøreegenskap, ingen toksiske eller skadelige effekter på organismer (inkludert menneskekroppen), ingen korrosjon og belegning av metaller, ingen volatilitets-, varmeresistens- og antioksidasjonsegenskaper. Skumdemper 7501 er en sammensetning av mannitol, fettsyrer, natriumhydroksid, som er et lysegult kolloid som er uløselig i vann. Det er et godt oljeløselig, ikke-ionisk overflateaktivt polyolmiddel. The drilling and completion fluid defoamer in h) is at least one which is preferably selected from glycerin polyether, emulsified silicone oil, dimethyl silicone oil and defoamer 7501 (Defoamer 7501). Glycerin polyether, also known as trihydroxypolyether or polyethertriol, which has a molecular weight of 3000 ± 300, is a colorless or pale yellow, transparent, viscous liquid that is non-toxic with a relative density (20 ºC/4 ºC) of 1.004 ~ 1.005, a flash point of 268 ºC, a viscosity (25 ºC) of 470 ~ 520 mPa·s, is insoluble in water but soluble in ethanol, benzene and other organic solvents. Dimethyl silicone oil, which is colorless and transparent, is a new synthetic polymer material that has a high flash point and low freezing point, which can be used at a temperature of -50 ºC ~ 200 ºC for a long time. It has a small viscosity-temperature coefficient, high compression rate, low surface tension and is not soluble in water, animal and vegetable oils and high boiling mineral oils, with good chemical stability and is non-toxic. It has been used frequently as a defoamer in the petroleum industry, chemical industry, medical industry, pharmaceutical industry and food processing industry. The emulsified silicone oil is a pure white emulsion with neutral pH, small surface tension, a wide water contact angle, good lubrication property, no toxic or harmful effects on organisms (including the human body), no corrosion and coating of metals, no volatility, heat resistance and antioxidation properties. Antifoam 7501 is a composition of mannitol, fatty acids, sodium hydroxide, which is a pale yellow colloid that is insoluble in water. It is a good oil-soluble, non-ionic polyol surfactant.
De foretrukket tilsatte mengdene av komponentene ovenfor for det sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidet er som følger (vekt/volum-prosent (tonn/m<3>%)): The preferred added amounts of the above components for the seawater-based, particle-free, environmentally friendly drilling and completion fluid are as follows (weight/volume percent (tons/m<3>%)):
b) det saltresistente og viskositetsøkende filtratreduksjonsmiddelet er 2 % - 6,5 %, mer foretrukket 3 % - 5 %, b) the salt-resistant and viscosity-increasing filtrate reducing agent is 2% - 6.5%, more preferably 3% - 5%,
c) utvaskingshemmeren er 2 % - 15,5 %, mer foretrukket 5 % - 11 %, c) the leaching inhibitor is 2% - 15.5%, more preferably 5% - 11%,
d) bore- og kompletteringsfluidsmøremiddelet er 3 % - 8 %, mer foretrukket 4 % -6 %, d) the drilling and completion fluid lubricant is 3%-8%, more preferably 4%-6%,
e) det reservoarbeskyttende middelet er 2 % - 8 %, mer foretrukket 3 % - 7 %, e) the reservoir protectant is 2% - 8%, more preferably 3% - 7%,
f) bore- og kompletteringsfluidpreserveringsmiddelet er 1 % - 5 %, mer foretrukket 1,5 % - 4 %, enda mer foretrukket 2 % - 3 %, f) the drilling and completion fluid preservative is 1% - 5%, more preferably 1.5% - 4%, even more preferably 2% - 3%,
g) pH-regulatoren er 0,5 % - 3 %, mer foretrukket 1 % - 2 %, g) the pH regulator is 0.5% - 3%, more preferably 1% - 2%,
h) bore- og kompletteringsfluidskumdempemiddelet er 0 % - 2 %, fortrinnsvis 0,1 % - 1 %. h) the drilling and completion fluid defoamer is 0% - 2%, preferably 0.1% - 1%.
Balansen er rent sjøvann. The balance is pure seawater.
Betegnelsen ”vekt/volum-prosent” henviser i dette dokument til ”tonn/m<3>%”. The term "weight/volume percentage" refers in this document to "ton/m<3>%".
De nevnte komponentene i b) – h) blir også kalt tilsetningsstoffer. De tilsatte mengdene av tilsetningsstoffene varierer i anvendelse i overensstemmelse med de ulike tetthetsområdene for bore- og kompletteringsfluider og termiske resistenskrav. Spesielt i tilfellene med høy temperatur og den høye tettheten for bore- og kompletteringsfluidene så vil de tilsatte mengdene bli økt i noen grad. The mentioned components in b) – h) are also called additives. The added quantities of the additives vary in application in accordance with the different density ranges for drilling and completion fluids and thermal resistance requirements. Especially in the cases of high temperature and the high density of the drilling and completion fluids, the added quantities will be increased to some extent.
Beskrevet heri er også en fremgangsmåte for fremstilling av de tidligere nevnte sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene som omfatter: dispergere de tidligere nevnte komponentene b), c), eventuelt d), eventuelt e), f), eventuelt g), eventuelt h), fortrinnsvis ved en temperatur på -5 ºC ~ 50 ºC, mer foretrukket ved romtemperatur, jevnt fordelt i sjøvann a) og fortsette å røre i en viss tidsperiode for å oppnå de sjøvannsbaserte, partikkelfrie, miljøvennlige boreog kompletteringsfluidene. Also described herein is a method for producing the previously mentioned seawater-based, particle-free, environmentally friendly drilling and completion fluids which comprise: dispersing the previously mentioned components b), c), optionally d), optionally e), optionally g), optionally h), preferably at a temperature of -5 ºC ~ 50 ºC, more preferably at room temperature, evenly distributed in seawater a) and continue stirring for a certain period of time to obtain the seawater-based, particle-free, environmentally friendly drilling and completion fluids.
Sammenlignet med den kjente teknikken har denne oppfinnelsen de følgende fortrinn: De sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene som blir tilveiebrakt ved foreliggende oppfinnelse er hensiktsmessige for ikke-perforerende bore- og kompletteringsoperasjoner ved offshore olje- og gassboring, i tillegg er komponentene som er valgt for bore- og kompletteringsfluidene all miljøvennlige, kjemiske midler som ikke bare optimaliserer egenskapene til bore- og kompletteringsfluidene men som også oppnår effektene med å beskytte reservoaret og miljøet. Eksperimenter viste at de sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene ifølge foreliggende oppfinnelse har en EC50-verdi på ≥ 6,0 x 10<5>mg/l, fortrinnsvis ≥ 6,5 x 10<5>mg/l, og en gjenvinningsverdi for fjellpermeabilitet på ≥ 90,5 %, fortrinnsvis 93,0 %. I reservoartesten i Bohai-havet ved en brønndybde på 3502 meter til 3913 meter hadde de sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidene en tetthet på 1,05 g/cm<3>– 1,10 g/cm<3>. Brønnen ble utsatt for en DST der en struper med en diameter på 8 med mer ble benyttet til blow-out, og vi oppnådde produktiviteten: daglig råoljekapasitet på ≥ 150 m<3>, fortrinnsvis ≥ 160 m<3>, naturgass ≥ 13000 m<3>, fortrinnsvis ≥ 14500 m<3>. Slik var produksjonseffekten uovertruffen. Compared to the known technique, this invention has the following advantages: The seawater-based, particle-free, environmentally friendly drilling and completion fluids provided by the present invention are suitable for non-perforating drilling and completion operations in offshore oil and gas drilling, in addition, the components which have been chosen for the drilling and completion fluids, all environmentally friendly chemical agents that not only optimize the properties of the drilling and completion fluids but also achieve the effects of protecting the reservoir and the environment. Experiments showed that the seawater-based, particle-free, environmentally friendly drilling and completion fluids according to the present invention have an EC50 value of ≥ 6.0 x 10<5>mg/l, preferably ≥ 6.5 x 10<5>mg/l, and a rock permeability recovery value of ≥ 90.5%, preferably 93.0%. In the reservoir test in the Bohai Sea at a well depth of 3,502 meters to 3,913 meters, the seawater-based, particle-free, environmentally friendly drilling and completion fluids had a density of 1.05 g/cm<3>– 1.10 g/cm<3>. The well was subjected to a DST where a choke with a diameter of 8 and more was used for blow-out, and we achieved the productivity: daily crude oil capacity of ≥ 150 m<3>, preferably ≥ 160 m<3>, natural gas ≥ 13000 m <3>, preferably ≥ 14500 m<3>. Thus the production effect was unsurpassed.
Utførelse av oppfinnelsen Implementation of the invention
De følgende eksemplene ble benyttet for å forklare foreliggende oppfinnelse i detalj uten at dette er ment å skulle begrense oppfinnelsen på noen måte. The following examples were used to explain the present invention in detail without this being intended to limit the invention in any way.
Eksempel 1: Example 1:
250 m<3>med rent sjøvann klargjort ved filtrering gjennom et sjøvannsfilter med en porekjernestørrelse på 5 μm ble injisert inn i produksjonstanken med en elektrisk rører, og etter at tilsetningen av rent sjøvann var ferdig ble den elektriske røreren skrudd på, og mens det ble rørt, med en blandetrakt utstyrt med en hydraulisk jetpumpe, ble 15 tonn natriumformat som utvaskingshemmer (som også virker som vektemiddel), 12,5 tonn hvit olje som bore- og kompletteringsfluidsmøremiddel, 15 tonn med modifisert polymeralkohol PGP-5 som det reservoarbeskyttende middelet, 2,5 tonn trietanolamin fosfatdihydro-fosfat som preserveringsmiddelet, 2,5 tonn natriumhydroksid som det pH-regulerende middelet, 250 kilogram dimetylsilikonolje som skumdempemiddel for bore- og kompletteringsfluidene og 5 tonn polyanionisk cellulose (PAC) som det saltresistente og viskositetsøkende filtratreduksjonsmidlet ble tilsatt i sekvens. Etter at alle råmaterialene var tilsatt ble røringen fortsatt i ikke mindre enn fire timer for fullstendig og jevnt løse opp råmaterialene for å gi det sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidet. Nevnte sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluid ble benyttet i en 30A-1-brønn i en region i Shengli-oljefeltet i Bohai-havet, og de spesifikke resultatene er vist i tabell 1 nedenfor. 250 m<3> of pure seawater prepared by filtering through a seawater filter with a pore core size of 5 μm was injected into the production tank with an electric stirrer, and after the addition of pure seawater was finished, the electric stirrer was turned on, and while stirred, with a mixing hopper equipped with a hydraulic jet pump, 15 tons of sodium formate as a leaching inhibitor (which also acts as a weighting agent), 12.5 tons of white oil as a drilling and completion fluid lubricant, 15 tons of modified polymer alcohol PGP-5 as the reservoir protective agent, 2.5 tonnes of triethanolamine phosphate dihydro-phosphate as the preservative, 2.5 tonnes of sodium hydroxide as the pH regulating agent, 250 kilograms of dimethyl silicone oil as a defoamer for the drilling and completion fluids and 5 tonnes of polyanionic cellulose (PAC) as the salt-resistant and viscosity-increasing filtrate reducer were added in sequence. After all the raw materials were added, stirring was continued for no less than four hours to completely and evenly dissolve the raw materials to provide the seawater-based, particle-free, environmentally friendly drilling and completion fluid. Said seawater-based, particle-free, environmentally friendly drilling and completion fluid was used in a 30A-1 well in a region of the Shengli oil field in the Bohai Sea, and the specific results are shown in Table 1 below.
Eksempel 2: Example 2:
200 m<3>rent sjøvann klargjort ved filtrering gjennom et sjøvannsfilter med en filterkjerneporestørrelse på 3 μm ble injisert inn i produksjonstanken med en elektrisk rører, og etter at tilsetningen av rent sjøvann var ferdig ble den elektriske røreren skrudd på. Og under omrøring, med en blandetrakt utstyrt med en hydraulisk jetpumpe, så ble 30 tonn natriumformat som utvaskingshemmeren (som også virker som vektemiddelet), 10 tonn med hvit olje som bore- og kompletteringsfluidsmøremiddelet, 12 tonn modifisert polymeralkohol PGP-5 som det reservoarbeskyttende middelet, 2 tonn med trietanolamin fosfatdihydro-fosfat som preserveringsmiddelet, 2 tonn med natriumhydroksid som det pH-regulerende middelet, 200 kg skumdempemiddel 7501 for bore- og kompletteringsfluider og 4 tonn med hydroksyetylcellulose (HEC) XT-20 som det saltresistente og viskositetsøkende filtratreduksjonsmiddelet tilsatt i sekvens. Etter at alle råmaterialene var tilsatt ble røringen fortsatt i ikke mindre enn fire timer for fullstendig og jevnt løse opp råmaterialene for å gi det sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidet. Nevnte sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluid ble benyttet i en 30A-1-brønn i en region i Shengli-oljefeltet i Bohai-havet, og de spesifikke resultatene er vist i tabell 1 nedenfor. 200 m<3>pure seawater prepared by filtering through a seawater filter with a filter core pore size of 3 μm was injected into the production tank with an electric stirrer, and after the addition of pure seawater was finished, the electric stirrer was turned on. And while stirring, with a mixing hopper equipped with a hydraulic jet pump, 30 tons of sodium formate as the leaching inhibitor (which also acts as the weighting agent), 10 tons of white oil as the drilling and completion fluid lubricant, 12 tons of modified polymer alcohol PGP-5 as the reservoir protective agent . sequence. After all the raw materials were added, stirring was continued for no less than four hours to completely and evenly dissolve the raw materials to provide the seawater-based, particle-free, environmentally friendly drilling and completion fluid. Said seawater-based, particle-free, environmentally friendly drilling and completion fluid was used in a 30A-1 well in a region of the Shengli oil field in the Bohai Sea, and the specific results are shown in Table 1 below.
Bore- og kompletteringsfluidene ifølge foreliggende oppfinnelse ble benyttet på feltene i en region i Shengli-oljefeltet i Bohai-havet, og de spesifikke resultatene er vist i tabell 1 nedenfor. The drilling and completion fluids according to the present invention were used in the fields in a region of the Shengli oil field in the Bohai Sea, and the specific results are shown in Table 1 below.
Tabell 1 Table 1
Arbeidsprosedyrer for sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluider Work procedures for seawater-based, particle-free, environmentally friendly drilling and completion fluids
1. Før operasjoner blir boreredskapene kjørt ned i bunnen av brønnen for skylling av den indre veggen av foringsrøret og den indre veggen av ”ground loop pipeline” med sirkulert vann. 1. Before operations, the drilling tools are driven down to the bottom of the well to flush the inner wall of the casing and the inner wall of the "ground loop pipeline" with circulated water.
2. Etter grundig vask av sirkulasjonstanken blir det sjøvannsbaserte, partikkelfrie, miljøvennlige bore- og kompletteringsfluidet ifølge eksempel 1 eller eksempel 2 injisert inn i brønnen og sirkulasjonstanken med en slampumpe, og uten å gå gjennom vibrasjonssikt, sirkulerer gjennom hele brønnen inntil alle tilsetningsstoffer er løst, og går deretter gjennom en 80-mesh (porestørrelse på 0,18 med mer) vibrasjonssikten inntil vibrasjonssiktstekstilet ikke er tilklint. 2. After thorough washing of the circulation tank, the seawater-based, particle-free, environmentally friendly drilling and completion fluid according to example 1 or example 2 is injected into the well and the circulation tank with a mud pump, and without going through a vibrating screen, circulates through the entire well until all additives are dissolved , and then passes through an 80-mesh (pore size of 0.18 and more) vibrating screen until the vibrating screen fabric is not stuck.
3. Under innboring bør vedlikeholdsbehandlingen bli utført i en gelvæsketank ved formulering av bore- og kompletteringsfluidene ifølge formuleringene i eksempel 1 eller eksempel 2. 3. During drilling, the maintenance treatment should be carried out in a gel liquid tank by formulating the drilling and completion fluids according to the formulations in example 1 or example 2.
4. Etter sluttført boring blir boret trukket ut og kjørt i hullet på en kort distanse. Når boret kjøres i hullet til bunnen blir en vibrerende sikt med et 150-mesk (porestørrelse på 0,102 med mer) sikttekstil benyttet for fullstendig sirkulasjon av bore- og kompletteringsfluidene. Operasjonsprosedyrene for opptrekk av boret fra hullet og innsetting av sikten bør ikke bli utført før det ikke lenger returneres steinavfall fra den vibrerende sikten. 4. After completed drilling, the drill is pulled out and driven into the hole for a short distance. When the drill is run in the hole to bottom, a vibrating screen with a 150-mesh (pore size of 0.102 and more) screen fabric is used for complete circulation of the drilling and completion fluids. The operating procedures for withdrawing the drill bit from the hole and inserting the screen should not be carried out until no more waste rock is returned from the vibrating screen.
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| CN113653452B (en) * | 2021-09-09 | 2022-10-25 | 中国石油大学(北京) | Oil-based drilling mixture reinjection composition, oil-based drilling mixture reinjection slurry, and preparation method and application thereof |
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| US20060019834A1 (en) * | 2004-07-22 | 2006-01-26 | Mohand Melbouci | Water-based drilling fluids |
| US20070197399A1 (en) * | 2006-02-23 | 2007-08-23 | Sau Arjun C | Ethoxylated raw cotton linters for completion and workover fluids |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101979457B (en) | 2013-06-05 |
| CN101979457A (en) | 2011-02-23 |
| MX2011010227A (en) | 2012-03-27 |
| MX353521B (en) | 2018-01-16 |
| NO20111305A1 (en) | 2012-03-29 |
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