CN109439295A - A kind of seawater base clean type drilling fluid - Google Patents
A kind of seawater base clean type drilling fluid Download PDFInfo
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- CN109439295A CN109439295A CN201811496022.6A CN201811496022A CN109439295A CN 109439295 A CN109439295 A CN 109439295A CN 201811496022 A CN201811496022 A CN 201811496022A CN 109439295 A CN109439295 A CN 109439295A
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- 238000005553 drilling Methods 0.000 title claims abstract description 94
- 239000012530 fluid Substances 0.000 title claims abstract description 72
- 239000013535 sea water Substances 0.000 title claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 48
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 150000003839 salts Chemical class 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003223 protective agent Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 229920002678 cellulose Polymers 0.000 claims abstract description 15
- 239000001913 cellulose Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 15
- 229920000447 polyanionic polymer Polymers 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims description 60
- 230000001070 adhesive effect Effects 0.000 claims description 60
- 230000002776 aggregation Effects 0.000 claims description 60
- 238000004220 aggregation Methods 0.000 claims description 60
- 229920006321 anionic cellulose Polymers 0.000 claims description 53
- 235000002639 sodium chloride Nutrition 0.000 claims description 40
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 19
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical group CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 239000011780 sodium chloride Substances 0.000 claims description 16
- 150000003863 ammonium salts Chemical class 0.000 claims description 12
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 229920001897 terpolymer Polymers 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- FKOZPUORKCHONH-UHFFFAOYSA-N 2-methylpropane-1-sulfonic acid Chemical compound CC(C)CS(O)(=O)=O FKOZPUORKCHONH-UHFFFAOYSA-N 0.000 claims 1
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000518 rheometry Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 239000000706 filtrate Substances 0.000 abstract description 4
- 230000001050 lubricating effect Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 239000007790 solid phase Substances 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 25
- 238000002360 preparation method Methods 0.000 description 13
- 150000002500 ions Chemical class 0.000 description 9
- 239000012188 paraffin wax Substances 0.000 description 8
- -1 Alkene nitrile ammonium salt Chemical class 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 239000013505 freshwater Substances 0.000 description 7
- 230000007062 hydrolysis Effects 0.000 description 7
- 238000006460 hydrolysis reaction Methods 0.000 description 7
- 238000013019 agitation Methods 0.000 description 6
- 239000011814 protection agent Substances 0.000 description 6
- 238000012827 research and development Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 150000001450 anions Chemical class 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000003643 water by type Substances 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
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
-
- 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
- C09K2208/34—Lubricant additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to drilling liquid technology fields, more particularly to a kind of seawater base clean type drilling fluid, be made of following raw materials according by following mass ratioes: the weight ratio of salt is 15%~20%, the weight ratio of polyanion cellulose is 0.4%~0.7%, the weight ratio of sealing agent is 0.5%~1.0%, the weight ratio of caustic soda is 0.1%~0.2%, the weight ratio of salt-resisting high-temperature-resisting filtration-reducing agent is 1%~2%, the weight ratio of oil layer protective agent is 1%~2%, surplus is water, solve existing Peru shallow sea block cryogenic conditions plunge into the commercial sea water-based clean type drilling fluid rheology control, drilling fluid temperature resistance and feature of environmental protection technical problem, the present invention has very strong seal-off effect, it can quickly be formed in nearly borehole wall band tough and tensile, fine and close sealing film is with stabilizing borehole, filtrate and solid phase is prevented further to immerse reservoir simultaneously, reach The effect of effective protection reservoir, and the drilling fluid lubricating drag-reduction effect is good, and high temperature resistant, low temperature rheological behaviour is easy to control, safety and environmental protection, hole stability in drilling process, the smooth lower going-into-well bottom of Completion Operations middle sleeve, and formula, technique with slurry are simple and easy to do.
Description
Technical field
The invention belongs to drilling liquid technology fields, and in particular to a kind of seawater base clean type drilling fluid.
Background technique
Peru's tower furthers sea region and neighbouring Ecuador's Guayaquil greater coasting area geology and geomorphology is closer to, oil
It is larger to develop dynamics at present for gas rich reserves, but the extremely unstable down-hole accident in stratum takes place frequently, according to the underground of drilled well data statistics
Accident rate is up to 14%, and lock of tool drilling happens occasionally.Meanwhile locality is influenced by tropical desert climate, fresh water shortage is seriously led
It causes a large amount of fresh water conveyings cannot be timely, seriously affects the production of offshore platform drillng operation.
If by continuous phase of seawater drilling and completing fluids cost can be increased to avoid because conveying fresh water to offshore drilling platform.
Meanwhile being constrained by local severe law of marine environmental protection Laws & Regulations, Offshore Operation environmental protection pressure is very huge.Therefore,
A set of ocean shallow water seawater base clean type drilling and completing fluids system can be developed, will be avoided because conveying fresh water to offshore drilling platform
And increase drilling and completing fluids cost, being conducive to Chuan Qing company characteristic drilling liquid technology extends from land to sea, for further developing
Overseas marine drilling drilling liquid technology service market is laid a good foundation and technological reserve.
The key technique problem that research and development seawater base clean type drilling fluid needs to solve:
1. drilling fluid rheology control technology under cryogenic conditions
Temperature influences drilling fluid rheology performance significantly, to carry out immense pressure to drilling fluid rheology control strip under low temperature, low
One of the difficult point that warm (5 DEG C or so) influence the viscosity of water base drilling fluid system and yield value for this research.
2. the research and development of salt-resisting high-temperature-resisting filtration-reducing agent
It polymerize species drilling fluid usually under high temperature and pressure well section and saline pollution, filter loss increases, and filter cake quality is deteriorated,
It is difficult to meet the new demand of salt tolerance and temperature resistance, therefore, high temperature polymerization species water-base drilling fluid high-temperature stability and leak-off
Regulation is similarly one of difficult point of this research.
3. offshore drilling clean type drilling liquid technology
Based on drilling fluid rheology control technology under cryogenic conditions and Peru's shallow sea block sea-bottom shallow cave-in mechanism
Result of study seeks the natural environmental-protective material that abundance, bio-toxicity are small, degradable, on the one hand as rich using source as possible
Rich, cheap natural material carries out chemical modification, a possibility that on the other hand constantly exploring using new material, develops
The novel environment-friendly type inorganic agent with exploitation further grinds choosing by key inorganic agent and compatibility optimizes, constructs Peru shallow sea
Block seawater base clean type drilling fluid composition.
4. Peru's shallow sea block reservoir protection technology
For Peru's shallow sea block reservoir characteristics, a set of suitable Peru shallow sea block reservoir protection drilling fluid is constructed.
Peru offshore sea waters is one of main fishing ground in the world, while drilling fluid meets traditional performance, it is necessary to it is required that boring
Well liquid small toxicity, many-sided environmental-protecting performance requirement such as environmental sound after biological degradability is good, inanimate object accumulates and discharge.Cause
This, Peru's shallow sea block seawater base clean type drilling fluid is needed through further investigation, and research and development New drilling fluid is maximum
Peru shallow sea block cryogenic conditions are solved to plunge into the commercial sea the control of water-based clean type drilling fluid rheology, drilling fluid temperature resistance and feature of environmental protection skill
Art problem.
Summary of the invention
Seawater base clean type drilling fluid purpose provided by the invention first is that overcome in the prior art Peru's tower further sea area
Domain and neighbouring Ecuador's Guayaquil greater coasting area are influenced by locality by tropical desert climate, and fresh water shortage seriously causes
A large amount of fresh water conveyings cannot be timely, seriously affects the production of offshore platform drillng operation, and can be to avoid as continuous phase using seawater
The problem of increasing drilling and completing fluids cost because conveying fresh water to offshore drilling platform；Purpose second is that overcome in the prior art Peru it is shallow
Sea area block cryogenic conditions are plunged into the commercial sea the control of water-based clean type drilling fluid rheology, drilling fluid temperature resistance and feature of environmental protection technical problem.
For this purpose, being made of following raw materials according by following mass ratioes: salt the present invention provides a kind of seawater base clean type drilling fluid
Weight ratio be 15%~20%, the weight ratio of polyanion cellulose is 0.4%~0.7%, and the weight ratio of sealing agent is
0.5%~1.0%, the weight ratio of caustic soda is 0.1%~0.2%, and the weight ratio of salt-resisting high-temperature-resisting filtration-reducing agent is 1%~2%,
The weight ratio of oil layer protective agent is 1%~2%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.1%~0.2% and the weight ratio of low adhesive aggregation anionic cellulose is 0.3%~0.5%.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 1~5:4~10:0.1~2.
The oil layer protective agent is modified paraffin.
The mass ratio of the 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt is 3:
7:1。
The size of the nanometer sealing agent is 100~300 nanometers.
The high adhesive aggregation anionic cellulose viscosity is 20~100mpa.s, low adhesive aggregation anionic cellulose dehydration 2.0~
10ml。
Beneficial effects of the present invention: this seawater base clean type drilling fluid provided by the invention,
1, the present invention solves the problems, such as the water-base drilling fluid low temperature thickening that ocean deepwater drilling operation is encountered, and passes through research and development
With preferred clean type inorganic agent, the sea water base drilling fluid system of a set of low temperature rheological behaviour having had is constructed, overcomes ocean depth
Water-base drilling fluid low temperature that water drilling well operations are encountered thickens problem, so that 5 DEG C and 25 DEG C of sea water base drilling fluid system apparent
The yield value ratio that viscosity ratio reaches 1.37,5 DEG C and 25 DEG C reaches 1.18, and low temperature rheological behaviour is well controlled.
2, research shows that the main damage factors of Peru's shallow sea block reservoir be in inclined strong retraction, therefore, change system filtrate
Property (as improved inhibition) and reduction immersion amount are to control the main starting point of reservoir damage, and the system of research and development should mention as far as possible
Highly inhibited, reduction dehydration, to achieve the purpose that protect reservoir.2- acrylamide-2-methylpro panesulfonic acid, acrylamide and water
Solve polyacrylonitrile ammonium salt terpolymer have well drop dehydration effect, by competitive Adsorption, chelating, shielding high price from
The effects of son, hydrophobic effect and absorption solubilising, drilling fluid filtrate is prevented to enter oil reservoir, while from can making to be adsorbed on rock surface again
Macromolecule polyalcohol is desorbed completely, and prevents polymer from adsorbing again, and there is anti-saturation salt (can resist for sulfonic acid group in drilling fluid
C 1 content is 91326mg/L, can anti-total hardness be 8926mg/L), amide group makes it have good hydrolytic stability, living
Bold and vigorous double bond makes it have polymerization again, and itrile group has preferable salt tolerant and heat resistance (can resist 150 DEG C), and NH4+ is in shale
In there is tessellation, there is certain caving control effect, and influenced by salinity, pH value small.
3, by research and development and preferred clean type inorganic agent, a set of sea water base drilling fluid system, the BOD5/ of system are constructed
CODCr is 0.663, degradable, bio-toxicity EC50 > 106mg/L, is nontoxic.
4, it is directed to reservoir formation feature, develops a kind of oil soluble temporary blocking type oil layer protective agent, which has good
Good high-temperature stability, oil layer protective agent remain to maintain good leak-off wave making machine and greasy property under 150 DEG C of high temperature, protect
Shield oil reservoir mechanism is generated on the borehole wall molecular film (isolation film) using the functional group that itself has, and the grain of oily molten water dispersion
It is temporarily stifled that son is capable of forming shielding again under certain pressure difference.Oil soluble temporary blocking type oil layer protective agent can form secured in the periphery of the borehole wall
Protective layer, prevent drilling fluid filtrate and pit shaft inner solid particulate phase from entering reservoir throat, effectively prevent stratum hydration swelling, seal
Stifled stratum stratification crack, prevents the migration of reservoir endoparticle, so that oil-gas Layer be effectively protected.
Detailed description of the invention
Fig. 1 is 1 low temperature rheological behaviour curve graph of embodiment；
Fig. 2 is 1 high temperature rheology curve graph of embodiment.
Specific embodiment
Embodiment 1:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 20%, is gathered
The weight ratio of anionic cellulose is 0.7%, and the weight ratio of sealing agent is 0.5%, and the weight ratio of caustic soda is 0.1%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 1%, and the weight ratio of oil layer protective agent is 2%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.2% and the weight ratio of low adhesive aggregation anionic cellulose is 0.5%；The high adhesive aggregation anion
Cellulose viscosity is 60mpa.s, low adhesive aggregation anionic cellulose dehydration 6ml
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 200 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 3:7:1.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 9.
Embodiment 2:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 20%, is gathered
The weight ratio of anionic cellulose is 0.4%, and the weight ratio of sealing agent is 1.0%, and the weight ratio of caustic soda is 0.1%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 1.5%, and the weight ratio of oil layer protective agent is 1.5%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.1% and the weight ratio of low adhesive aggregation anionic cellulose is 0.3%；The high adhesive aggregation anion
Cellulose viscosity is 20mpa.s, low adhesive aggregation anionic cellulose dehydration 2.0ml.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 100 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 5:4:1.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 8.
Embodiment 3:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 20%, is gathered
The weight ratio of anionic cellulose is 0.6%, and the weight ratio of sealing agent is 0.8%, and the weight ratio of caustic soda is 0.1%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 2.0%, and the weight ratio of oil layer protective agent is 1.0%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.2% and the weight ratio of low adhesive aggregation anionic cellulose is 0.4%；The high adhesive aggregation anion
Cellulose viscosity is 100mpa.s, low adhesive aggregation anionic cellulose dehydration 10ml.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 300 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 1:10:0.1.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 10.
Embodiment 4:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 20%, is gathered
The weight ratio of anionic cellulose is 0.7%, and the weight ratio of sealing agent is 0.5%, and the weight ratio of caustic soda is 0.1%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 1.0%, and the weight ratio of oil layer protective agent is 2.0%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.2% and the weight ratio of low adhesive aggregation anionic cellulose is 0.5%；The high adhesive aggregation anion
Cellulose viscosity is 50mpa.s, low adhesive aggregation anionic cellulose dehydration 5ml.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 150 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 2:7:1.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 9.
Embodiment 5:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 15%, is gathered
The weight ratio of anionic cellulose is 0.5%, and the weight ratio of sealing agent is 1.0%, and the weight ratio of caustic soda is 0.2%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 1.5%, and the weight ratio of oil layer protective agent is 2.0%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.15% and the weight ratio of low adhesive aggregation anionic cellulose is 0.35%；The high adhesive aggregation yin from
Subbundle element viscosity is 70mpa.s, low adhesive aggregation anionic cellulose dehydration 7ml.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 250 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 4:5:1.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 10.
Embodiment 6:
A kind of seawater base clean type drilling fluid is made of following raw materials according by following mass ratioes: the weight ratio of salt is 17%, is gathered
The weight ratio of anionic cellulose is 0.4%, and the weight ratio of sealing agent is 1.0%, and the weight ratio of caustic soda is 0.15%, and salt resistance is anti-
The weight ratio of high temperature fluid loss agent is 1.5%, and the weight ratio of oil layer protective agent is 2.0%, and surplus is water.
The salt is sea salt.
The polyanion cellulose includes high adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, high adhesive aggregation yin
The weight ratio of ion fiber element is 0.20% and the weight ratio of low adhesive aggregation anionic cellulose is 0.20%；The high adhesive aggregation yin from
Subbundle element viscosity is 40mpa.s, low adhesive aggregation anionic cellulose dehydration 4ml.
The sealing agent is nanometer sealing agent, and nanometer sealing agent is nanometer calcium carbonate；The granularity ruler of the nanometer sealing agent
Very little is 100 nanometers.
The salt-resisting high-temperature-resisting filtration-reducing agent is 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolysis poly- third
Alkene nitrile ammonium salt terpolymer, the quality of 2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt
Than for 3:8:2.
The oil layer protective agent is modified paraffin.
The preparation method of the seawater base clean type drilling fluid, the specific steps are as follows: weigh raw material by above-mentioned weight ratio, first
Water is added in a reservoir, is then under agitation added to the container sea salt, is stirred well to and is completely dissolved；Then successively add
Enter high adhesive aggregation anionic cellulose, sealing agent, low adhesive aggregation anionic cellulose, salt-resisting high-temperature-resisting filtration-reducing agent and oil layer protection
Agent is stirred 50 minutes；It is eventually adding alkalinity regulator caustic soda, the pH for adjusting solution completes preparation when being 9.
Modified paraffin of the invention be it is existing can be in market purchasing, by petroleum works limited public affairs in petrochemical industry Central Plains in Ningbo City
Department provides.
Effect assessment test of the invention and result
One, embodiment 1-6 sea water base drilling fluid can anti-total hardness, anti-Cl-Total concentration evaluation
It is taken in sea salt room with scene and prepares sea water base drilling fluid, prepared with the brine ratio that saturated brine mass ratio is 20%,
Each ion concentration testing result is shown in Table 1 in seawater:
1 seawater intermediate ion Concentration Testing result of table
As shown in Table 1, in embodiment 1, Cl in sea water base drilling fluid-Content is 91326mg/L, total Ca2+、Mg2+Content is (total
Hardness) it is 8926mg/L；
In embodiment 2, Cl in sea water base drilling fluid-Content is 91321mg/L, total Ca2+、Mg2+Content (total hardness) is
8918mg/L；
In embodiment 3, Cl in sea water base drilling fluid-Content is 91258mg/L, total Ca2+、Mg2+Content (total hardness) is
8915mg/L；
In embodiment 4, Cl in sea water base drilling fluid-Content is 91278mg/L, total Ca2+、Mg2+Content (total hardness) is
8893mg/L；
In embodiment 5, Cl in sea water base drilling fluid-Content is 91234mg/L, total Ca2+、Mg2+Content (total hardness) is
8909mg/L；
In embodiment 6, Cl in sea water base drilling fluid-Content is 91256mg/L, total Ca2+、Mg2+Content (total hardness) is
8861mg/L。
Two, embodiment 1-6 sea water base drilling fluid system inhibition is evaluated
The rock core expansion rate test experiments of 2 sea water base drilling fluid system of table
Found out by 2 rock core expansion rate test data of table, reaches 62.74% or more, 16h after rock core swell increment reduced rate 8h
After reach 60.19% or more, illustrate that the inhibition of system is very strong.
Three, embodiment 1-6 sea water base drilling fluid system reservoir protection is evaluated
3 sea water base drilling fluid system of table is temporarily blocked up and de-plugging evaluation experimental
From the data in table 3, it can be seen that the oil layer protective agent of various concentration is added in sea water base drilling fluid system, temporarily stifled rate and de-plugging
Rate reaches 90% or more, reaches good reservoir protection effect.
Four, embodiment 1-6 sea water base drilling fluid system environmental protection index is evaluated
4 seawater base environment-friendly type drilling and completing fluids system environmental protection index of table
As seen from table, seawater base environment-friendly type drilling and completing fluids system BOD5/CODCrIt is 0.663 or more, degradable, biology poison
Property EC50>106Mg/L is nontoxic.
Five, rheological characteristic is evaluated under embodiment 1-6 sea water base drilling fluid system low temperature, under high temperature
1. rheological characteristic is evaluated under low temperature
5 low temperature rheological data of table
In embodiment 1 it can be seen from data in table and Fig. 1,5 DEG C and 25 DEG C of apparent viscosity ratio reach 1.37,5 DEG C and
25 DEG C of yield value ratio reaches 1.18.
2. 6 high temperature rheological data of rheological characteristic evaluation table under high temperature
Data and Fig. 2 can be seen that when the temperature of system reaches 160 DEG C from table, and system viscosity bust illustrates system
150 DEG C of highest temperature resistance.
The formula of the drilling fluid system is simplified, and inexpensive trend is obvious, and extemporaneous preparation, service procedure are easy, operability
By force, it lays a good foundation and technological reserve to open up overseas marine drilling drilling liquid technology service market in next step.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (9)
1. a kind of seawater base clean type drilling fluid, it is characterised in that: be made of following raw materials according by following mass ratioes: the weight ratio of salt
It is 15%~20%, the weight ratio of polyanion cellulose is 0.4%~0.7%, the weight ratio of sealing agent is 0.5%~
1.0%, the weight ratio of caustic soda is 0.1%~0.2%, and the weight ratio of salt-resisting high-temperature-resisting filtration-reducing agent is 1%~2%, and oil reservoir is protected
The weight ratio for protecting agent is 1%~2%, and surplus is water.
2. seawater base clean type drilling fluid as described in claim 1, it is characterised in that: the salt is sea salt.
3. seawater base clean type drilling fluid as described in claim 1, it is characterised in that: the polyanion cellulose includes height
Adhesive aggregation anionic cellulose and low adhesive aggregation anionic cellulose, the weight ratio of high adhesive aggregation anionic cellulose are 0.1%~0.2%
Weight ratio with low adhesive aggregation anionic cellulose is 0.3%~0.5%.
4. seawater base clean type drilling fluid as described in claim 1, it is characterised in that: the sealing agent is nanometer sealing agent,
Nanometer sealing agent is nanometer calcium carbonate.
5. seawater base clean type drilling fluid as described in claim 1, it is characterised in that: the salt-resisting high-temperature-resisting filtration-reducing agent is
2- acrylamide-2-methylpro panesulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt terpolymer, 2- acrylamido-
The mass ratio of 2- methyl propane sulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt is 1~5:4~10:0.1~2.
6. seawater base clean type drilling fluid as described in claim 1, it is characterised in that: the oil layer protective agent is modified stone
Wax.
7. seawater base clean type drilling fluid as claimed in claim 5, it is characterised in that: the 2- acrylamido -2- methyl
The mass ratio of propane sulfonic acid, acrylamide and hydrolyzed polyacrylonitrile ammonium salt is 3:7:1.
8. seawater base clean type drilling fluid as claimed in claim 4, it is characterised in that: the size of the nanometer sealing agent
It is 100~300 nanometers.
9. seawater base clean type drilling fluid as claimed in claim 3, it is characterised in that: the high adhesive aggregation anionic cellulose is viscous
Degree is 20~100mpa.s, 2.0~10ml of low adhesive aggregation anionic cellulose dehydration.
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