CN116445139A - Low-temperature drilling fluid and preparation method thereof - Google Patents
Low-temperature drilling fluid and preparation method thereof Download PDFInfo
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- CN116445139A CN116445139A CN202210015489.4A CN202210015489A CN116445139A CN 116445139 A CN116445139 A CN 116445139A CN 202210015489 A CN202210015489 A CN 202210015489A CN 116445139 A CN116445139 A CN 116445139A
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- 238000005553 drilling Methods 0.000 title claims abstract description 79
- 239000012530 fluid Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 26
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 239000000706 filtrate Substances 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000000314 lubricant Substances 0.000 claims abstract description 14
- 239000001103 potassium chloride Substances 0.000 claims abstract description 13
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 13
- 239000011780 sodium chloride Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000010428 baryte Substances 0.000 claims abstract description 8
- 229910052601 baryte Inorganic materials 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 42
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 32
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 16
- 229920005862 polyol Polymers 0.000 claims description 14
- 150000003077 polyols Chemical class 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000008117 stearic acid Substances 0.000 claims description 12
- 229940092782 bentonite Drugs 0.000 claims description 10
- 229910000281 calcium bentonite Inorganic materials 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 7
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 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 claims description 6
- 239000004368 Modified starch Substances 0.000 claims description 6
- 229920000881 Modified starch Polymers 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 6
- 230000036571 hydration Effects 0.000 claims description 6
- 238000006703 hydration reaction Methods 0.000 claims description 6
- 235000019426 modified starch Nutrition 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000000230 xanthan gum Substances 0.000 claims description 6
- 229920001285 xanthan gum Polymers 0.000 claims description 6
- 235000010493 xanthan gum Nutrition 0.000 claims description 6
- 229940082509 xanthan gum Drugs 0.000 claims description 6
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 5
- 229920000447 polyanionic polymer Polymers 0.000 claims description 5
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 5
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 5
- 229940080314 sodium bentonite Drugs 0.000 claims description 5
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229920001222 biopolymer Polymers 0.000 claims description 3
- 230000001804 emulsifying effect Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000007710 freezing Methods 0.000 abstract description 6
- 230000008014 freezing Effects 0.000 abstract description 6
- 230000002401 inhibitory effect Effects 0.000 abstract description 5
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 235000021355 Stearic acid Nutrition 0.000 description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000000518 rheometry Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000013138 pruning Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
-
- 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
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
-
- 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
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
-
- 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
- C09K2208/22—Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers
-
- 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
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a low-temperature drilling fluid which comprises, by weight, 100 parts of water, 1-2 parts of bentonite, 0.05-0.1 part of a cutting agent, 0.05-0.3 part of a coating inhibitor, 1-3 parts of a filtrate reducer, 2-6 parts of a plugging collapse preventing agent, 1-3 parts of a lubricant, 5-7 parts of potassium chloride, 15-25 parts of sodium chloride, 20-30 parts of composite alcohol and 0-400 parts of barite; the preparation process of the low temperature drilling fluid is also disclosed; the invention greatly improves the inhibition of the drilling fluid, is beneficial to the stability of the well wall, reduces the freezing point of the drilling fluid, ensures that the drilling fluid has good low-temperature rheological property, and has the effect of inhibiting the generation of natural gas hydrate at low temperature; in addition, the composite alcohol is added into the drilling fluid, so that the freezing point of the drilling fluid can be reduced, the drilling fluid has good low-temperature rheological property, and the composite alcohol also has the effect of inhibiting the generation of natural gas hydrate at low temperature.
Description
Technical Field
The invention belongs to the technical field of drilling fluid for petroleum drilling, and particularly relates to low-temperature drilling fluid and a preparation method thereof.
Background
The drilling of low-temperature stratum such as frozen soil layer, polar region and ocean deep water has important significance for scientific research and exploration and development of mineral and oil gas resources, the drilling and coring work of the low-temperature stratum needs the assistance of low-temperature drilling fluid with excellent performance, and compared with the drilling of conventional stratum, the drilling of the low-temperature stratum is the biggest difference in ensuring rheological property of the drilling fluid at low temperature, and for the stratum with the temperature lower than 0 ℃, the natural state and the temperature state of the frozen soil stratum of the hole wall also need to be maintained, if the temperature of the drilling fluid is too high, heat exchange is generated between the drilling fluid and the stratum in the circulation process, the original temperature of the drilled stratum is changed, the original occurrence state of the stratum is damaged, the well wall is unstable, and if the low-temperature resistance of the drilling fluid is insufficient, the drilling fluid is possibly frozen in the hole and lost due to long-time circulation of the drilling fluid in the hole.
In order to solve the problem of drilling of ocean deepwater low-temperature stratum, the prior art mainly researches a constant-rheology drilling fluid technology, and the drilling fluid formed by the technology has relatively high cost and is limited to a low-temperature environment of about 4 ℃. For the drilling of polar regions and frozen soil layers, the construction is mainly carried out by a conventional drilling fluid system matched with heat preservation measures, related drilling practices under severe conditions are lacked, and related research works are just to carry out freezing point depression on the basis of the conventional drilling fluid. For example, CN201310372989 discloses a low molecular monoester ester group ultralow temperature drilling fluid for a two-component polar region, which is only suitable for polar region ice driller, cannot adjust the density of the drilling fluid, and has high preparation cost. The research reports on the low-temperature rheological property of the ocean deepwater drilling fluid at about 4 ℃ at home and abroad are more, but the viscosity of the drilling fluid treatment agent is increased sharply along with the temperature reduction, so that the application of the drilling fluid at extremely low temperature is greatly limited.
CN105505346a discloses a water-based drilling fluid for low temperature formation drilling, which has good rheology at-5 ℃, but no exact data support is available for maintaining good rheology at lower temperature conditions. CN201611044884 discloses an ultralow temperature drilling fluid for deep sea and frozen earth area drilling, which fully considers inhibiting the generation of natural gas hydrate and stabilizing the well wall, but has a complex formulation.
Disclosure of Invention
The invention solves the technical problems by adopting the following technical scheme:
the low-temperature drilling fluid comprises, by weight, 100 parts of water, 1-2 parts of bentonite, 0.05-0.1 part of a cutting agent, 0.05-0.3 part of a coating inhibitor, 1-3 parts of a filtrate reducer, 2-6 parts of a plugging anti-collapse agent, 1-3 parts of a lubricant, 5-7 parts of potassium chloride, 15-25 parts of sodium chloride, 20-30 parts of composite alcohol and 0-400 parts of barite.
Further, the composite alcohol is a mixture of ethanol, ethylene glycol and propylene glycol, and the weight ratio of the ethanol to the ethylene glycol to the propylene glycol is (0.1-0.5) 1 (0.1-0.5).
Further, the bentonite is natural sodium bentonite after 24 hours of hydration or calcium bentonite after sodium modification.
Further, the filtrate reducer is a mixture of ultra-low viscosity polyanion cellulose and modified starch, and the weight ratio of the two is 1: (1-3) and the apparent viscosity of the filtrate reducer 2% aqueous solution at 25 ℃ is <10 mPa.s.
Further, the plugging anti-collapse agent is a mixture of a polyalcohol-stearic acid copolymer BZ-YFT and calcium carbonate, and the weight ratio of the polyalcohol-stearic acid copolymer BZ-YFT to the calcium carbonate is 1: (2-6).
Further, the coating inhibitor comprises at least one of polyacrylamide potassium salt and polyacrylamide.
Further, the lubricant is polyether polyol, and is formed by emulsifying propylene oxide and ethylene oxide block polymers and a surfactant.
Further, the cutting agent refers to biopolymer xanthan gum.
Further, the calcium bentonite is subjected to sodium modification through anhydrous sodium carbonate, wherein the weight of the anhydrous sodium carbonate is 3.5-5% of that of the calcium bentonite.
The preparation method of the low-temperature drilling fluid comprises the following steps:
adding bentonite into the water in a stirring state, stirring and maintaining;
and in a stirring state, adding a cutting agent, a coating inhibitor and a filtrate reducer, stirring, adding a plugging anti-collapse agent and a lubricant, continuously stirring, adding sodium chloride, potassium chloride and composite alcohol, stirring, adding barite to adjust the density, stirring, and curing to obtain the drilling fluid.
The invention has the advantages and positive effects that:
the sodium chloride and the potassium chloride are added into the drilling fluid, so that the inhibition of the drilling fluid is greatly improved, the stability of a well wall is facilitated, meanwhile, the freezing point of the drilling fluid is reduced, the drilling fluid has good low-temperature rheological property, and the sodium chloride and the potassium chloride also have the effect of inhibiting the generation of natural gas hydrate at a low temperature; in addition, the composite alcohol is added into the drilling fluid, so that the freezing point of the drilling fluid can be reduced, the drilling fluid has good low-temperature rheological property, and the composite alcohol also has the effect of inhibiting the generation of natural gas hydrate at low temperature.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein may be continued to be any combination or pruning between such features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Example 1
The low-temperature drilling fluid comprises, by weight, 100 parts of water, 1-2 parts of bentonite, 0.05-0.1 part of a cutting agent, 0.05-0.3 part of a coating inhibitor, 1-3 parts of a filtrate reducer, 2-6 parts of a plugging anti-collapse agent, 1-3 parts of a lubricant, 5-7 parts of potassium chloride, 15-25 parts of sodium chloride, 20-30 parts of composite alcohol and 0-400 parts of barite.
Wherein the bentonite is natural sodium bentonite after 24 hours of hydration or calcium bentonite after sodium modification; the calcium bentonite is subjected to sodium modification through anhydrous sodium carbonate, wherein the weight of the anhydrous sodium carbonate is 3.5-5% of that of the calcium bentonite; the cutting agent is biopolymer xanthan gum; the coating inhibitor comprises at least one of polyacrylamide potassium salt and polyacrylamide; the filtrate reducer is a mixture of ultra-low viscosity polyanion cellulose and modified starch, and the weight ratio of the two is 1: (1-3) and the apparent viscosity of the filtrate reducer 2% aqueous solution at 25 ℃ is <10 mPa-s; the plugging collapse preventing agent is a mixture of a polyol stearic acid copolymer BZ-YFT and calcium carbonate which are industrial products of a company, and the weight ratio of the polyol stearic acid copolymer BZ-YFT to the calcium carbonate is 1: (2-6), wherein the granularity of the calcium carbonate is 800-2000 meshes; the lubricant is polyether polyol, and is formed by emulsifying propylene oxide and ethylene oxide block polymers and a surfactant; the composite alcohol is a mixture of ethanol, glycol and propylene glycol, and the weight ratio of the ethanol to the glycol is (0.1-0.5) 1 (0.1-0.5).
The preparation method of the low-temperature drilling fluid comprises the following steps:
adding bentonite into the water in a stirring state, stirring and maintaining;
and in a stirring state, adding a cutting agent, a coating inhibitor and a filtrate reducer, stirring, adding a plugging anti-collapse agent and a lubricant, continuously stirring, adding sodium chloride, potassium chloride and composite alcohol, stirring, adding barite to adjust the density, stirring, and curing to obtain the drilling fluid.
Example 2
Weighing 100 parts of clear water by weight, adding 1 part of natural sodium bentonite in a stirring state, stirring for 30min at a rotating speed of 2000+/-100 r/min, and maintaining at room temperature for at least 24h;
slowly adding 0.1 part of a cutting agent xanthan gum, 0.3 part of a coating inhibitor polyacrylamide potassium salt and 1 part of a filtrate reducer in a stirring state, wherein the weight ratio of the ultra-low viscosity polyanionic cellulose to the modified starch is 1:1, stirring for 1h at a low speed, and adding 6 parts of plugging and anti-collapse agent, wherein the plugging agent is a mixture of a polyol stearic acid copolymer BZ-YFT and calcium carbonate which are industrial products of a company, the granularity of the calcium carbonate is 800-2000 meshes, and the weight ratio of the calcium carbonate to the polyol stearic acid copolymer BZ-YFT is 1:6, simultaneously adding 3 parts of lubricant polyether polyol, continuously stirring for 1h, adding 15 parts of sodium chloride and 7 parts of potassium chloride, adding 30 parts of composite alcohol (wherein the mass ratio of ethanol to glycol to propylene glycol is 0.1:1:0.5), stirring for 1h, adding 30 parts of heavy crystal stone to adjust the density, continuously stirring for 30min, and maintaining for 16-24h at room temperature to prepare the low-temperature drilling fluid.
Example 3
Weighing 100 parts of clear water, adding 2 parts of calcium bentonite and 0.07 part of anhydrous sodium carbonate in a stirring state, stirring for 30min at a rotating speed of 2000+/-100 r/min, and curing for at least 24h at room temperature;
in terms of parts by weight, slowly adding 0.1 part of a cutting agent xanthan gum and 0.05 part of a coating inhibitor polyacrylamide under a stirring state, and slowly adding 3 parts of a filtrate reducer, wherein the filtrate reducer is ultra-low viscosity polyanion cellulose and modified starch, and the weight ratio of the two is 1:3, stirring for 1h at a low speed, and adding 2 parts of plugging and anti-collapse agent, wherein the plugging and anti-collapse agent is a mixture of a polyol stearic acid copolymer BZ-YFT and calcium carbonate which are industrial products of a company, the granularity of the calcium carbonate is 800-2000 meshes, and the weight ratio of the calcium carbonate to the polyol stearic acid copolymer BZ-YFT is 1:2, simultaneously adding 1 part of lubricant polyether polyol, continuously stirring for 1h, adding 25 parts of sodium chloride and 5 parts of potassium chloride, adding 20 parts of composite alcohol (wherein the mass ratio of ethanol to glycol to propylene glycol is 0.1:1:0.1), stirring for 1h, adding 30 parts of heavy crystal stone to adjust the density, continuously stirring for 30min, and maintaining for 16-24h at room temperature to prepare the low-temperature drilling fluid.
Example 4
Comprises 100 parts by weight of water, 1-2 parts by weight of bentonite, 0.05-0.1 part by weight of cutting agent, 0.05-0.3 part by weight of coating inhibitor, 1-3 parts by weight of filtrate reducer, 2-6 parts by weight of plugging anti-collapse agent, 1-3 parts by weight of lubricant, 5-7 parts by weight of potassium chloride, 15-25 parts by weight of sodium chloride, 20-30 parts by weight of composite alcohol and 0-400 parts by weight of barite.
Weighing 100 parts of clear water by weight, adding 1 part of natural sodium bentonite in a stirring state, stirring for 30min at a rotating speed of 2000+/-100 r/min, and maintaining at room temperature for at least 24h;
in terms of parts by weight, slowly adding 0.05 part of a cutting agent xanthan gum and 0.2 part of a coating inhibitor in a stirring state, wherein the inhibitor is polyacrylamide potassium salt and polyacrylamide with a mass ratio of 1:1, and adding 2 parts of a filtrate reducer, wherein the weight ratio of the ultra-low viscosity polyanion cellulose to the modified starch is 1:2, stirring for 1h at a low speed, and adding 3 parts of plugging and anti-collapse agent, wherein the plugging and anti-collapse agent is a mixture of a polyol stearic acid copolymer BZ-YFT and calcium carbonate which are industrial products of a company, the granularity of the calcium carbonate is 800-2000 meshes, and the weight ratio of the calcium carbonate to the polyol stearic acid copolymer BZ-YFT is 1:4, adding 2 parts of lubricant polyether polyol, continuing stirring for 1h, adding 20 parts of sodium chloride and 7 parts of potassium chloride, adding 25 parts of composite alcohol (wherein the mass ratio of ethanol to glycol to propylene glycol is 0.1:1:0.1), stirring for 1h, adding 30 parts of heavy crystal stone to adjust the density, continuing stirring for 30min, and maintaining for 16-24h at room temperature to prepare the low-temperature drilling fluid.
Example 5
The drilling fluids of examples 2, 3 and 4 were subjected to experiments on the relevant properties and parameters, and the results are shown in table 1:
table 1 drilling fluid freezing point and rheological fluid loss test data
The plastic viscosity is used for measuring the strength of internal friction when the network structure in the drilling fluid is damaged or recovered, the dynamic shear force is used for measuring the strength of the space network structure capacity in the drilling fluid, and the test results in the table 1 show that the low-temperature drilling fluid provided by the invention has good rheological property and fluid loss property under the low-temperature condition that the solidifying point of the low-temperature drilling fluid is < -25 ℃.
Low temperature formation drilling, shale and hydration and ice layer dissolution cause instability of the borehole wall, and therefore, low temperature drilling fluids are required to have good inhibition. The drilling fluids in examples 2, 3 and 4 are subjected to expansion experiments and rolling recovery experiments to obtain the shale hydration inhibition capability of the low-temperature drilling fluid, and the results are shown in table 2, so that the drilling fluid in the embodiment of the invention has smaller expansion rate and higher rolling recovery rate, and the drilling fluid has excellent shale hydration inhibition capability.
TABLE 2
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. The low-temperature drilling fluid is characterized by comprising, by weight, 100 parts of water, 1-2 parts of bentonite, 0.05-0.1 part of a cutting agent, 0.05-0.3 part of a coating inhibitor, 1-3 parts of a filtrate reducer, 2-6 parts of a plugging collapse preventing agent, 1-3 parts of a lubricant, 5-7 parts of potassium chloride, 15-25 parts of sodium chloride, 20-30 parts of composite alcohol and 0-400 parts of barite.
2. A cryogenic drilling fluid according to claim 1, characterized in that: the composite alcohol is a mixture of ethanol, glycol and propylene glycol, and the weight ratio of the ethanol to the glycol is (0.1-0.5) 1 (0.1-0.5).
3. A cryogenic drilling fluid according to claim 1, characterized in that: the bentonite is natural sodium bentonite after 24 hours of hydration or calcium bentonite after sodium modification.
4. A cryogenic drilling fluid according to claim 1, characterized in that: the filtrate reducer is a mixture of ultra-low viscosity polyanion cellulose and modified starch, and the weight ratio of the two is 1: (1-3) and the apparent viscosity of the filtrate reducer 2% aqueous solution at 25 ℃ is <10 mPa.s.
5. A cryogenic drilling fluid according to claim 1, characterized in that: the plugging collapse preventing agent is a mixture of a polyalcohol-stearic acid copolymer BZ-YFT and calcium carbonate, and the weight ratio of the polyalcohol-stearic acid copolymer BZ-YFT to the calcium carbonate is 1: (2-6).
6. A cryogenic drilling fluid according to claim 1, characterized in that: the coating inhibitor comprises at least one of polyacrylamide potassium salt and polyacrylamide.
7. A cryogenic drilling fluid according to claim 1, characterized in that: the lubricant is polyether polyol, and is formed by emulsifying propylene oxide and ethylene oxide block polymers and a surfactant.
8. A cryogenic drilling fluid according to claim 1, characterized in that: the cutting agent refers to biopolymer xanthan gum.
9. A cryogenic drilling fluid according to claim 1, characterized in that: the calcium bentonite is subjected to sodium modification through anhydrous sodium carbonate, wherein the weight of the anhydrous sodium carbonate is 3.5-5% of that of the calcium bentonite.
10. A method of preparing a low temperature drilling fluid according to any one of claims 1 to 9, comprising the steps of:
adding bentonite into the water in a stirring state, stirring and maintaining;
and in a stirring state, adding a cutting agent, a coating inhibitor and a filtrate reducer, stirring, adding a plugging anti-collapse agent and a lubricant, continuously stirring, adding sodium chloride, potassium chloride and composite alcohol, stirring, adding barite to adjust the density, stirring, and curing to obtain the drilling fluid.
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| CN105018052A (en) * | 2015-08-17 | 2015-11-04 | 成都理工大学 | Low-solid-phase low-temperature polymer drilling fluid |
| CN105505346A (en) * | 2015-12-09 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Water-based drilling fluid for low-temperature formation drilling |
| CN110804424A (en) * | 2019-10-11 | 2020-02-18 | 中国石油大学(华东) | Water-based clay-phase-free drilling fluid and application thereof in drilling of polar frozen earth formation |
| CN112480883A (en) * | 2020-11-26 | 2021-03-12 | 中国石油集团渤海钻探工程有限公司 | Desulfonation environment-friendly water-based drilling fluid and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018052A (en) * | 2015-08-17 | 2015-11-04 | 成都理工大学 | Low-solid-phase low-temperature polymer drilling fluid |
| CN105505346A (en) * | 2015-12-09 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Water-based drilling fluid for low-temperature formation drilling |
| CN110804424A (en) * | 2019-10-11 | 2020-02-18 | 中国石油大学(华东) | Water-based clay-phase-free drilling fluid and application thereof in drilling of polar frozen earth formation |
| CN112480883A (en) * | 2020-11-26 | 2021-03-12 | 中国石油集团渤海钻探工程有限公司 | Desulfonation environment-friendly water-based drilling fluid and preparation method thereof |
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