CN106916575A - A kind of high density low solids fluid - Google Patents
A kind of high density low solids fluid Download PDFInfo
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- CN106916575A CN106916575A CN201710086867.7A CN201710086867A CN106916575A CN 106916575 A CN106916575 A CN 106916575A CN 201710086867 A CN201710086867 A CN 201710086867A CN 106916575 A CN106916575 A CN 106916575A
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- high density
- low solids
- fluid
- density low
- calcium
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- 239000012530 fluid Substances 0.000 title claims abstract description 64
- 239000007787 solid Substances 0.000 title claims abstract description 42
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 229920002472 Starch Polymers 0.000 claims abstract description 24
- 239000008107 starch Substances 0.000 claims abstract description 24
- 235000019698 starch Nutrition 0.000 claims abstract description 24
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011575 calcium Substances 0.000 claims abstract description 22
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 22
- 239000000440 bentonite Substances 0.000 claims abstract description 19
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 19
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 19
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical class [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 claims abstract description 19
- 239000001913 cellulose Substances 0.000 claims abstract description 19
- 229920002678 cellulose Polymers 0.000 claims abstract description 19
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000001110 calcium chloride Substances 0.000 claims abstract description 18
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 18
- 229940123973 Oxygen scavenger Drugs 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 7
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 34
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 28
- 229910001622 calcium bromide Inorganic materials 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- 235000010265 sodium sulphite Nutrition 0.000 claims description 14
- 241000196324 Embryophyta Species 0.000 claims description 10
- 229920000447 polyanionic polymer Polymers 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 235000004431 Linum usitatissimum Nutrition 0.000 claims description 4
- 244000250129 Trigonella foenum graecum Species 0.000 claims description 4
- 235000001484 Trigonella foenum graecum Nutrition 0.000 claims description 4
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 229920000609 methyl cellulose Polymers 0.000 claims description 4
- 239000001923 methylcellulose Substances 0.000 claims description 4
- 235000001019 trigonella foenum-graecum Nutrition 0.000 claims description 4
- 229920002085 Dialdehyde starch Polymers 0.000 claims description 3
- 244000275012 Sesbania cannabina Species 0.000 claims description 3
- 229940084030 carboxymethylcellulose calcium Drugs 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 240000006240 Linum usitatissimum Species 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 244000241257 Cucumis melo Species 0.000 claims 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 claims 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims 1
- 150000001336 alkenes Chemical group 0.000 claims 1
- 125000002636 imidazolinyl group Chemical group 0.000 claims 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 29
- 150000003839 salts Chemical class 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- -1 1 2% Chemical compound 0.000 abstract description 2
- 235000002639 sodium chloride Nutrition 0.000 description 10
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 9
- 229920002907 Guar gum Polymers 0.000 description 7
- 239000000665 guar gum Substances 0.000 description 7
- 235000010417 guar gum Nutrition 0.000 description 7
- 229960002154 guar gum Drugs 0.000 description 7
- 230000005764 inhibitory process Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 241000894007 species Species 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 2
- 241000208202 Linaceae Species 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 description 1
- 241000219782 Sesbania Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 229940006460 bromide ion Drugs 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
-
- 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
- C09K2208/32—Anticorrosion additives
Landscapes
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Detergent Compositions (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a kind of high density low solids fluid; bentonite including 1 2%, 1 3% starch fluid loss additive, 1 3% cellulose family fluid loss additive, 1 3% natural plant gum, 1 3% corrosion inhibiter, 1 2% magnesia, 0.1% 0.5% oxygen scavenger, 1 5% detailed catalogue calcium, 50 65% calcium chloride, 40 140% calcium bromides; the high density low solids fluid has that strong rejection capability, solid concentration be low, salt resistance pollution capacity strong, the good feature of reservoir protection effect, can be used for the reservoir protection drilling well of strong retraction stratum.
Description
Technical field
The present invention relates to petroleum gas field, more particularly to a kind of high density low solids fluid.
Background technology
Development with domestic and international petroleum industry and the continuous growth to oil demand, petroleum exploration and development scope is increasingly
Extensively, bore meet strong retraction reservoir when, stratum clay hydration swelling, dispersion, migration easily cause reservoir pore and the water sensitivity such as block hinders
Evil, causes reservoir permeability to decline, thus in strong retraction drilling-in jobs, it is necessary to using with Strong Inhibitive Drilling Fluids.At present
Conventional drilling fluid mainly has oil base drilling fluid, potassium chloride salt aqueous drilling fluid, sodium chloride salt aqueous drilling fluid, organic salt drilling fluid
Deng oil base drilling fluid has high cost, the problems such as to stratum and environmental pollution, if using common salt water drilling fluid, body
Salt is mainly the monovalence salt such as sodium salt, sylvite in system, and inhibition is weaker than the divalence salt such as calcium ion, in high-density environments drilling well
Also need to add the inert materials such as a large amount of barites in liquid, easily cause the closure of reservoir pore throat, irreversible injury is caused to reservoir.
The content of the invention
It is an object of the invention to provide a kind of high density low solids fluid, there is the drilling fluid strong rejection capability, solid phase to contain
Amount is low, salt resistance pollution capacity is strong, the good feature of reservoir protection effect, it is adaptable to the reservoir protection drilling well of strong retraction stratum.
The present invention is achieved through the following technical solutions：
A kind of high density low solids fluid, including 1-2% bentonite, the starch fluid loss additive of 1-3%, 1-3%
Cellulose family fluid loss additive, the natural plant gum of 1-3%, 1-3% corrosion inhibiter, 1-2% magnesia, 0.1-0.5% oxygen scavengers, 1-
5% detailed catalogue calcium, the calcium chloride of 50-65%, the calcium bromide of 40-140%, the content of above each component in terms of the quality of water,
The starch fluid loss additive is allyl starch, HES, hydroxypropul starch, CMS, dialdehyde
At least one in starch, acrylamide starch；
The cellulose family fluid loss additive is hydroxyethyl cellulose, methylcellulose, polyanion cellulose, carboxymethyl fibre
At least one in dimension element；
The natural plant gum is at least one in sesbania gum, guar gum, flax gum, fenugreek gum；
The corrosion inhibiter is at least one in imidazoline, coloured glaze base benzothiazole, BTA；
The oxygen scavenger is sodium sulfite.
The preparation method of described high density low solids fluid, comprises the following steps：
(1) to bentonite is added in water, stir to form mixture A；
(2) the starch fluid loss additive, cellulose family fluid loss additive, plant are added to the mixture A obtained by step (1)
Glue, stirs to form mixture B；
(3) to the corrosion inhibiter is added in step (2) gained mixture B, stir to form mixture C；
(4) to the magnesia, detailed catalogue calcium is added in step (3) gained mixture C, stir to form mixture D；
(5) to the oxygen scavenger, calcium chloride, calcium bromide is added in step (4) gained mixture D, stir, institute is obtained
State high density low solids fluid.
It is under the rotating speed of 8000-12000r/min, described bentonite to be added while stirring in the step (1), stirs
10-30min is mixed, in the step (2), 30-45min is stirred；Stirring 10-20min in the step (3)；In the step (4)
Stirring 10-20min；Stirring 30-45min in the step (5).
Beneficial effects of the present invention are:
1. the high density low solids fluid has good inhibition, and DWSW liquid system inhibition is with cation
Valence state is raised and strengthened, and substantial amounts of calcium chloride, calcium bromide divalent salts are added in the drilling fluid, greatly reduces free water activity,
Drilling fluid inhibition is improve, is conducive to water-sensitive formation borehole wall stability.
2. the high density low solids fluid uses calcium chloride, calcium bromide as compound exacerbation salt, relative to conventional chlorinating
A large amount of bromide ions are introduced in calcium drilling fluid system, bromide ion is bigger compared with chlorion ionic radius, and adsorption capacity is weaker, it is easier to swim
From in drilling fluid system, the coagulation ability stronger to clay mineral is realized, improve drilling fluid inhibition, it is ensured that drilling process well
Wall stabilization.
3. salt content is high in the high density low solids fluid, and brine-base fluid density ranges up to 1.80g/cm3, in system
Need not be aggravated using inert materials such as barites, greatly reduce system solid content, reduced and reservoir pore throat is blocked, reservoir protection
Effect is good.
4. using magnesia as pH adjusting agent, on the one hand magnesia can improve pH to the high density low solids fluid
Value, on the one hand can coordinate with detailed catalogue calcium, realize temporarily blocking up the shielding of reservoir pore throat, reach protection reservoir effect.
5. the high density low solids fluid improves system inorganic agent temperature resistance by adding oxygen scavenger, and temperature resistance is up to 125
DEG C, solve the low solid phase salt-water drilling fluid temperature resistance problem of high density.
6. the high density low solids fluid contains a large amount of calcium ions, and conventional drilling liquid fluid loss additive is in high calcium-containing situation
Lower failure, single use starch fluid loss additive, cellulose family fluid loss additive or natural plant gum are also unable to reach control filter loss mesh
's.The present invention is acted on using starch fluid loss additive, cellulose family fluid loss additive, natural plant gum trielement synergistic, the drop filter of three classes first
All containing abundant hydroxyl in mistake agent structure, weak complexing effect can be formed with calcium ion, formation space net structure is reduced freely
Water activity, effectively reduces the drilling fluid filtrate under down-hole high pressure and permeates trend to stratum, also with starch fluid loss additive
Weak water-soluble plugging effect, coordinates cellulose family fluid loss additive to be lifted to drilling fluid liquid phase viscosity with natural plant gum, and trielement synergistic reaches
Control filter loss effect.
Specific embodiment
With reference to specific embodiment, the present invention is further elaborated, and each component content is in terms of the quality of water.
Embodiment 1
The present invention provide a kind of high density low solids fluid, including 1% bentonite, 2% hydroxypropul starch,
1% polyanion cellulose, 1% guar gum, 1% imidazoline, 1% magnesia, 0.1% sodium sulfite, 2% detailed catalogue
Calcium, 65% calcium chloride, 40% calcium bromide and water.
The preparation method of the high density low solids fluid is as follows：
(1) under the rotating speed of 12000r/min, Xiang Shuizhong adds 1% bentonite while stirring, stirs 30min；
(2) 2% hydroxypropul starch, 1% polyanion cellulose, 1% guar gum is sequentially added, 30min is stirred；
(3) 1% imidazoline is added, 10min is stirred；
(4) 1% magnesia, 2% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.1% sodium sulfite, 65% calcium chloride, 40% calcium bromide are sequentially added, 45min is stirred, is obtained described
High density low solids fluid.
Embodiment 2
The present invention provide a kind of high density low solids fluid, including 1.5% bentonite, 3% CMS,
1.0% methylcellulose, 0.5% carboxymethylcellulose calcium, 1% flax gum, 1% BTA, 1.5% magnesia,
0.2% sodium sulfite, 1% detailed catalogue calcium, 50% calcium chloride, 140% calcium bromide and water.
The preparation method of the high density low solids fluid is as follows：
(1) under the rotating speed of 8000r/min, Xiang Shuizhong adds 1.5% bentonite while stirring, stirs 20min；
(2) 3% CMS, 1.0% methylcellulose, 0.5% carboxymethylcellulose calcium, 1% is sequentially added
Flax gum, stir 40min；
(3) 1% BTA is added, 15min is stirred；
(4) 1.5% magnesia, 1% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.2% sodium sulfite, 50% calcium chloride, 140% calcium bromide are sequentially added, 30min is stirred, institute is obtained
State high density low solids fluid.
Embodiment 3
The present invention provide a kind of high density low solids fluid, including 1% bentonite, 1% dialdehyde starch, 1%
Acrylamide starch, 2% hydroxyethyl cellulose, 0.5% sesbania gum, 0.5% fenugreek gum, 1% BTA, 2%
Magnesia, 0.2% sodium sulfite, 3% detailed catalogue calcium, 60% calcium chloride, 90% calcium bromide and water.
The preparation method of the high density low solids fluid is as follows：
(1) under the rotating speed of 10000r/min, Xiang Shuizhong adds 1% bentonite while stirring, stirs 20min；
(2) sequentially add 1% dialdehyde starch, 1% acrylamide starch, 2% hydroxyethyl cellulose, 0.5%
Sesbania gum, 0.5% fenugreek gum, stir 45min；
(3) 1% BTA is added, 15min is stirred；
(4) 2% magnesia, 3% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.2% sodium sulfite, 60% calcium chloride, 90% calcium bromide are sequentially added, 45min is stirred, is obtained described
High density low solids fluid.
Comparative example 1
High density low solids fluid, using 1% bentonite, 2% polymerization species fluid loss additive, 1% it is poly- cloudy from
Subbundle element, 1% guar gum, 1% imidazoline, 1% magnesia, 0.1% sodium sulfite, 2% detailed catalogue calcium, 65% chlorination
Calcium, 40% calcium bromide and water.
Wherein polymerization species fluid loss additive is Shandong De Shunyuan Petroleum Technology Co., Ltd co-polymer of sulfonate fluid loss additive
DSP-2。
The preparation method of the drilling fluid is as follows：
(1) under the rotating speed of 12000r/min, to 1% bentonite is added while stirring, 30min is stirred；
(2) 2% polymerization species fluid loss additive, 1% polyanion cellulose, 1% guar gum is sequentially added, is stirred
30min；
(3) 1% imidazoline is added, 10min is stirred；
(4) 1% magnesia, 2% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.1% sodium sulfite, 65% calcium chloride, 40% calcium bromide are sequentially added, 45min is stirred, is obtained described
High density low solids fluid.
Comparative example 2
High density low solids fluid, using 1% bentonite, 1% polyanion cellulose, 1% guar gum,
1% imidazoline, 1% magnesia, 0.1% sodium sulfite, 2% detailed catalogue calcium, 50% calcium chloride, 140% calcium bromide and water.
The preparation method of the drilling fluid is as follows：
(1) under the rotating speed of 12000r/min, Xiang Shuizhong adds 1% bentonite while stirring, stirs 30min；
(2) 1% polyanion cellulose, 1% guar gum is sequentially added, 30min is stirred；
(3) 1% imidazoline is added, 10min is stirred；
(4) 1% magnesia, 2% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.1% sodium sulfite, 50% calcium chloride, 140% calcium bromide are sequentially added, 45min is stirred, institute is obtained
State high density low solids fluid.
Comparative example 3
High density low solids fluid, using 1% bentonite, 2% hydroxypropul starch, 1% polyanion fiber
Element, 1% imidazoline, 1% magnesia, 0.1% sodium sulfite, 2% detailed catalogue calcium, 60% calcium chloride, 90% calcium bromide and
Water.
The preparation method of the drilling fluid is as follows：
(1) under the rotating speed of 12000r/min, Xiang Shuizhong adds 1% bentonite while stirring, stirs 30min；
(2) 2% hydroxypropul starch, 1% polyanion cellulose is sequentially added, 30min is stirred；
(3) 1% imidazoline is added, 10min is stirred；
(4) 1% magnesia, 2% detailed catalogue calcium are sequentially added, 20min is stirred；
(5) 0.1% sodium sulfite, 60% calcium chloride, 90% calcium bromide are sequentially added, 45min is stirred, is obtained described
High density low solids fluid.
Table 1 is organic salt drilling fluid Evaluation results of the present invention, tests the rheological characteristic of drilling fluid of the present invention under high temperature
Can, the index such as filtrate loss controllability and linear shale expansion reduced rate.
Table 1：High density low solids fluid performance
Note：Rheological property is measured at 50 DEG C.
As it can be seen from table 1 high density low solids fluid of the present invention has excellent performance, can effectively suppress shale swollen
It is swollen, it is ensured that the borehole wall stability during strong retraction drilling-in jobs, prevent underground complex accident from occurring, the drilling fluid uses starch
Class fluid loss additive, cellulose family fluid loss additive, the class inorganic agent of natural plant gum three simultaneously compound action, in the case of drilling fluid high calcium-containing
Reduction filter loss purpose is reached.
Claims (8)
1. a kind of high density low solids fluid, it is characterised in that the starch filtrate reducing of bentonite, 1-3% including 1-2%
Agent, the cellulose family fluid loss additive of 1-3%, the natural plant gum of 1-3%, 1-3% corrosion inhibiter, 1-2% magnesia, 0.1%-0.5%
Oxygen scavenger, the detailed catalogue calcium of 1-5%, the calcium chloride of 50-65%, the calcium bromide of 40-140%, the content of above each component is with water
Quality meter.
2. high density low solids fluid according to claim 1, it is characterised in that：The starch fluid loss additive is alkene
At least one in propyl group starch, HES, hydroxypropul starch, CMS, dialdehyde starch, acrylamide starch.
3. high density low solids fluid according to claim 1, it is characterised in that：The cellulose family fluid loss additive is
At least one in hydroxyethyl cellulose, methylcellulose, polyanion cellulose, carboxymethylcellulose calcium.
4. high density low solids fluid according to claim 1, it is characterised in that：The natural plant gum is sesbania gum, melon
At least one in your glue, flax gum, fenugreek gum.
5. high density low solids fluid according to claim 1, it is characterised in that：The corrosion inhibiter is imidazoline, coloured glaze
At least one in base benzothiazole, BTA.
6. high density low solids fluid according to claim 1, it is characterised in that：The oxygen scavenger is sodium sulfite.
7. a kind of preparation method of high density low solids fluid as claimed in claim 1, it is characterised in that including following step
Suddenly：
(1) to bentonite is added in water, stir to form mixture A；
(2) the starch fluid loss additive, cellulose family fluid loss additive, natural plant gum are added to the mixture A obtained by step (1),
Stir to form mixture B；
(3) to the corrosion inhibiter is added in the mixture B obtained by step (2), stir to form mixture C；
(4) to the magnesia, detailed catalogue calcium is sequentially added in the mixture C obtained by step (3), stir to form mixture D；
(5) to the oxygen scavenger, calcium chloride, calcium bromide is added in the mixture D obtained by step (4), stir, be obtained described
High density low solids fluid.
8. preparation method according to claim 7, it is characterised in that be in 8000-12000r/min in the step (1)
Rotating speed under, described bentonite is added while stirring, stir 10-30min, in the step (2), stir 30-45min；Institute
State stirring 10-20min in step (3)；Stirring 10-20min in the step (4)；Stirring 30-45min in the step (5).
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| CN117535037A (en) * | 2023-11-07 | 2024-02-09 | 荆州嘉华科技有限公司 | A kind of shale gas green water-based drilling fluid and its application |
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