CN107556990A - It is a kind of to strengthen the organic salt drilling fluid suppressed with sealing characteristics - Google Patents
It is a kind of to strengthen the organic salt drilling fluid suppressed with sealing characteristics Download PDFInfo
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Abstract
The invention provides a kind of organic salt drilling fluid strengthened and suppressed with sealing characteristics, including 2 4% antisaline soils, 0.3 0.5% soda ash, 30 60% organic salts, 0.2 0.5% extracting and cutting agent, 0.5 2% fluid loss additive, 1 4% suppression sealing agent, 1 4% nanometer of sealing agent, 0.2 0.5% fluorocarbon alcohol, 0.5 2.5% polymeric alcohol, 0.5 1% inhibitor polyetheramine, 1 2% crystalline flake graphite, 3 5% superfine light calcium carbonate, 190 260% barites；Above percentage composition is in terms of the mass content of water.It is weaker to the shut-off capacity of mud shale microcrack that the drilling fluid solves conventional organic salt drilling fluid, the problem of surface hydration rejection is undesirable, there is good inhibition and seal-off effect under the conditions of chance shale, mudstone stratum is bored, disclosure satisfy that requirement of the unconventionaloil pool well construction to water-base drilling fluid.
Description
Technical field
The invention belongs to oil drilling drilling liquid technology field, and in particular to a kind of organic salt drilling fluid.
Background technology
On long terms, energy relative shortage will be a great difficult problem that China faces.Supplied in conventional energy resource increasingly tight
In the case of, rational exploitation and utilization unconventional energy resource resource is extremely urgent, and in unconventional energy resource, shale gas resource reserve is rich
Richness has larger potentiality to be exploited, however, utilization of the China to shale gas are still at an early stage, experience is deficient, technology
Immature, policy is left to be desired.Generally there is the mud shale stratum in China high shale content, stratification development, microcrack to develop
Feature, exploration and development process easily cause borehole well instability, " blood " of the drilling fluid as drilling engineering, and the performance of drilling fluid is right
The exploitation success or failure of the unconventional energy resource such as shale gas are most important.
Shale gas drilling well can use oil base drilling fluid and synthetic base drilling fluid, can also use strong rejection capability water-based drilling
Liquid, its key are to ensure that wellbore stability, lubrication, anti-sticking and well cleaning.Current domestic shale gas drilling well is mainly bored using oil base
Well liquid, for environmental protection pressure and cost of exploration ＆ development is reduced, also has part shale gas well to use high performance water-based drilling fluid.But
During the unconventional energy resource such as exploitation shale gas, often there is microcrack in mud shale stratum, drilling fluid filtrate is easily being pressed
Enter stratum along microcrack under difference effect, the pressure of drilling fluid is transmitted in the earth formation, causes borehole well instability, and this is water-based drilling
Liquid facing challenges.
Organic salt drilling fluid system has good inhibition, is the drilling fluid system quickly grown in recent years, organic salt
Drilling fluid system, filtrate viscosity is high, water activity is low, advantageously reduces capillary pressure, suppresses water and penetrates into shale pore throat and microcrack,
Be advantageous to wellbore stability.But many shale gas stratum are rich in organic matter, cause stratum to have not only hydrophilic but also oleophylic characteristic, table
The performance of face aquation outstanding problem, conventional organic salt drilling fluid system, its seal-off effect and suppression surface hydration can't be complete
Meet the exploitation demand of the unconventional energy resource such as shale gas, application is restricted.
The content of the invention
It is an object of the invention to provide a kind of organic salt drilling fluid system strengthened and suppressed with sealing characteristics, broadening are organic
Salt drilling fluid application, is adapted to the exploitation of the unconventional energy resource such as shale gas, the drilling fluid system have high inhibition, strong closure,
The features such as high temperature resistance, high density, system environmental protection, moderate cost.
The present invention is achieved through the following technical solutions：
A kind of organic salt drilling fluid system for strengthening suppression and sealing characteristics, including 2-4% antisaline soils, 0.3-0.5%
Soda ash, 30-60% organic salts, 0.2-0.5% extracting and cutting agents, 0.5-2% fluid loss additives, 1-4% suppress sealing agent, 1-4% nanometers
Sealing agent, 0.2-0.5% fluorocarbon alcohol, 0.5-2.5% polymeric alcohols, 0.5-1% polyetheramines, 1-2% crystalline flake graphites, 3-5%
Superfine light calcium carbonate, 190-260% barites；Above percentage composition is in terms of the mass content of water.
The antisaline soil is modified meerschaum or attapulgite；
The organic salt is potassium formate and/or sodium formate；
The extracting and cutting agent is xanthans, welan gum or chitosan；
The fluid loss additive is carboxymethyl cellulose or polyanion cellulose；
The suppression sealing agent is albino bitumen, sulfonated gilsonite；
The nanometer sealing agent is vinyl acetate-ethylene copolymerization compound emulsion, butylbenzene nanoemulsions, polycarbonate nano breast
One or more in liquid and surface modified nano silicon.
The vinyl acetate-ethylene copolymerization compound emulsion is vinyl acetate-ethylene copolymerization compound of the particle diameter in 100-200nm
Emulsion；Butylbenzene nanoemulsions are styrene-butadiene emulsion of the particle diameter in 50-100nm；Polycarbonate nano emulsion is particle diameter in 50-100nm
Polycarbonate emulsion；Surface modified nano silicon is silica of the particle diameter in 50-80nm of surface modification.
The fluorocarbon alcohol is tetrafluoro butanediol, five fluorine propyl alcohol or hexafluoroisopropanol.
The superfine light calcium carbonate is the superfine light calcium carbonate of 600 mesh, 1250 mesh and 2500 mesh according to 1:1-2:1-2
Ratio compounding forms.
Beneficial effects of the present invention：It is provided by the invention to strengthen the organic salt drilling fluid suppressed with sealing characteristics, due to profit
With fluorocarbon alcohol class surfactant, mud shale surface characteristic can be changed, make angle of wetting close to 90 DEG C, reduce organic salt drilling fluid
The interfacial tension between mud shale, mud shale surface hydrophobicity oleophobic property is enhanced, coordinate the potent inhibitors such as polyetheramine, effectively suppress mud
Shale permeates aquation and surface hydration effect, keeps mud shale green strength, maintains wellbore stability.Using micro-nano solid phase material
Deng closure, consolidating stratum micropore and microcrack, slow pressure transmission and filtrate intrusion are hindered, consolidates the borehole wall, coordinates compounding use different
The calcium carbonate superfine powder of particle diameter, further increase its seal-off effect.The drilling fluid system that the present invention is formed has high inhibition, strong closure
The characteristics of, the system is more environmentally friendly compared to oil base drilling fluid, cost is low, therefore can be attempted in shale gas horizontal well.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail, but example is not as the limit to the present invention
It is fixed.
Embodiment 1
It is a kind of strengthen suppress and sealing characteristics organic salt drilling fluid system, including 2% modified meerschaum, 0.3% it is pure
Alkali, 60% potassium formate, 0.2% xanthans, 2% carboxymethyl cellulose, 1.5% albino bitumen, 1% vinyl acetate-ethylene copolymerization close
Thing emulsion (D50 values are 81nm), 1% nano silicon (particle diameter is in 54nm), 0.2% tetrafluoro butanediol, 0.5% polymeric alcohol,
0.5% polyetheramine, 1% crystalline flake graphite, 3% superfine light calcium carbonate, 190% barite；Above percentage composition is with water
Mass content meter.The superfine light calcium carbonate is 600 mesh, 1250 mesh and 2500 mesh according to mass ratio 1:1:1 compounding forms.
Under high-speed stirred drilling fluid is prepared according to mode of the present invention.
Embodiment 2
It is a kind of strengthen suppress and sealing characteristics organic salt drilling fluid system, including 4% attapulgite, 0.4% soda ash,
30% sodium formate, 0.5% welan gum, 0.5-2% polyanion celluloses, 2% sulfonated gilsonite, 2% vinyl acetate-ethylene copolymerization
Compound emulsion (D50 values are 81nm), 1% styrene-butadiene emulsion (D50 values are 90nm), 0.4% 5 fluorine propyl alcohol, 1.5% polymeric alcohol, 1%
Polyetheramine, 2% crystalline flake graphite, 5% superfine light calcium carbonate, 220% barite；Above percentage composition is with the mass content of water
Meter.The superfine light calcium carbonate is 600 mesh, 1250 mesh and 2500 mesh according to mass ratio 1:1:2 compoundings form.In high-speed stirred
Under according to mode of the present invention prepare drilling fluid.
Embodiment 3
It is a kind of strengthen suppress and sealing characteristics organic salt drilling fluid system, including 3% modified meerschaum, 0.5% it is pure
Alkali, 30% potassium formate, 30% sodium formate, 0.4% chitosan, 0.5% carboxymethyl cellulose, 1% polyanion cellulose, 4%
Albino bitumen, 1% vinyl acetate-ethylene copolymerization compound emulsion (D50 values are 81nm), 1% styrene-butadiene emulsion (D50 values are 90nm), 1%
Polycarbonate emulsion (D50 values are 65nm), 1% nano silicon (particle diameter 54nm), 0.4% tetrafluoro butanediol, 2.5% gather
Close alcohol, 1% polyetheramine, 2% crystalline flake graphite, 4% superfine light calcium carbonate, 260% barite；Above percentage composition is with water
Mass content meter.The superfine light calcium carbonate is 600 mesh, 1250 mesh and 2500 mesh according to mass ratio 1:1:1 compounding forms.
Under high velocity agitation drilling fluid is prepared according to mode of the present invention.
Embodiment 4
It is a kind of strengthen suppress and sealing characteristics organic salt drilling fluid system, including 2% attapulgite, 0.3% soda ash,
50% potassium formate, 0.3% xanthans, 1% carboxymethyl cellulose, 1% polyanion cellulose, 1% sulfonated gilsonite, 1% poly- carbon
Acid esters emulsion (D50 values are 65nm), 2% nano silicon (particle diameter 54nm), 0.3% hexafluoroisopropanol, 2.5% polymerization
Alcohol, 0.5% polyetheramine, 1% crystalline flake graphite, 4% superfine light calcium carbonate, 260% barite；Above percentage composition is with water
Mass content meter.The superfine light calcium carbonate is 600 mesh, 1250 mesh and 2500 mesh according to mass ratio 1:2:2 compoundings form.
Under high-speed stirred drilling fluid is prepared according to mode of the present invention.
Embodiment 5
It is a kind of strengthen suppress and sealing characteristics organic salt drilling fluid system, including 4% modified meerschaum, 0.4% it is pure
Alkali, 40% sodium formate, 0.4% welan gum, 2% carboxymethyl cellulose, 4% albino bitumen, 1% styrene-butadiene emulsion (D50 values are 90nm),
1% nano silicon (particle diameter 54nm), 0.2% tetrafluoro butanediol, 2% polymeric alcohol, 1% polyetheramine, 1% crystalline flake graphite,
5% superfine light calcium carbonate, 260% barite；Above percentage composition is in terms of the mass content of water.The superthin light carbonic acid
Calcium is 600 mesh, 1250 mesh and 2500 mesh according to mass ratio 1:2:2 compoundings form.Under high velocity agitation according to of the present invention
Mode prepares drilling fluid.
Comparative example 1
A kind of organic salt drilling fluid system, including 2% modified meerschaum, 0.3% soda ash, 60% potassium formate, 0.2% Huang
Virgin rubber, 2% carboxymethyl cellulose, 1.5% albino bitumen, 0.5% polymeric alcohol, 1% crystalline flake graphite, 190% barite；Above percentage
Content is in terms of the mass content of water.It is identical with each component dosage of embodiment 1, only it is not added with polyetheramine, fluorocarbon alcohol and nanometer envelope
Blocking agent.Under high velocity agitation drilling fluid is prepared according to mode of the present invention.
The strong rejection capability and the inhibition of the organic salt drilling fluid system of strong seal-off effect that this patent provides for convenience of description
With the effect of seal-off effect, the inhibition to each embodiment and seal-off effect have carried out measuring respectively.
Inhibition is tested
To embodiment 1-5 drilling fluid system according to GB/T 29170-2012《Industrial gas oil drilling fluid laboratory
Test》In shale specified in 23 chapters " shale roll recovery test " roll scattered rate of recovery experimental method, have rated drilling fluid
The inhibition of system.The core that experiment uses is derived from Sichuan Changning Weiyuan block Longma small stream group stratum, experiment hot rolling temperature 130
DEG C, rolling rate of recovery data are as shown in table 2.
To embodiment 1-5 drilling fluid system, using OFITE 150-80-1 high temperature dynamic linear shale expansion instrument, evaluation
Its inhibition.Experiment suppresses artificial core using drilling fluid expansion test bentonite (meeting SY/T 5490-2015), in
25 DEG C of measure expansion rates.Expansion rate data are as shown in table 2.
Each embodiment shale rolling rate of recovery of table 1
| Embodiment | Comparative example | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Primary recovery | 94.2% | 99.0% | 98.7% | 99.1% | 98.8% | 99.0% |
| Secondary returning yield | 88.2% | 98.7% | 98.7% | 99.0% | 98.8% | 98.7% |
| The rate of recovery three times | 79.2% | 98.5% | 98.5% | 98.8% | 98.5% | 98.6% |
Each embodiment expansion rate data of table 2
| Embodiment | Comparative example | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Expansion rate | 26.1% | 20.1% | 15.0% | 10.3% | 11.2% | 11.9% |
The inhibition that embodiment 1-5 is can be seen that from Tables 1 and 2 data is significantly stronger than comparative example, it was demonstrated that this patent
The organic salt drilling fluid system of the strong rejection capability of offer and strong seal-off effect has excellent inhibition.
Seal-off effect is evaluated
To embodiment 1-5 drilling fluid system according to GB/T16783.1-2014《Industrial gas oil drilling fluid scene
Test part 1：Water-base drilling fluid》Determine its high temperature and high pre ssure filtration, 130 DEG C of experimental temperature.30min filter losses FL
(HTHP) as shown in table 3.
Each embodiment high temperature and high pre ssure filtration of table 3
According to《GB/T 29170-2012 industrial gas oil drilling fluids laboratory is tested》, instrument is blocked using permeability
Determine the seal-off effect of embodiment 1-5 drilling fluid system.Filtration media used in experiment is the potsherd of the millidarcy of permeability 400,
Pressure difference 6.9MPa (1000Psi), 130 DEG C of experimental temperature, record 30min filter losses (VPPT)。
Each embodiment seal-off effect data of table 4
| Embodiment | Comparative example | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| VPPT/mL | 9.0 | 5.4 | 4.8 | 4.2 | 4.8 | 5.0 |
Pressure transportation experiment.Mud shale permeability is extremely low, and micropore is often filled by stratum water, only a small amount of filtrate intrusion,
Sidewall Surrounding Rock inner pore pressure can be caused to significantly improve, then be superimposed with " pressure transmission " effect, cause country rock pore pressure to improve, drop
Low effective stress supporting role, aggravate borehole wall mechanics destabilization problems.Using HTHP borehole wall stability analogue experiment installation, enter
Row pressure transportation experiment, test core is put into core holding unit, is pumped into through upstream test solution entrance in test liquid and rock core
End contact, rock core top pressure 2.0MPa is maintained, (drilling fluid), bottom initial pressure 1.0MPa (normal saline solution), passes through prison
Measuring pressure transfer rate, so as to evaluate its sealing characteristics.
The pressure transmission data of table 5
Consolidated statement 3-5 data, which can be seen that embodiment 1-5, can strengthen the seal-off effect of organic salt drilling fluid, and the present invention carries
The organic salt drilling fluid system of the strong rejection capability of confession and strong seal-off effect has outstanding seal-off effect.In summary, the present invention provides
Strong rejection capability and strong seal-off effect organic salt drilling fluid system inhibition sealing characteristics it is excellent, can further widen organic salt
The application of drilling fluid system, it disclosure satisfy that requirement of the unconventionaloil pool well construction to water-base drilling fluid.
Above example only be choose several preferred embodiments of the invention, not to the present invention do it is any in form
Limitation, every technical spirit according to the present invention, any equivalent modifications made to above example, each fall within guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that including 2-4% antisaline soils, 0.3-
0.5% soda ash, 30-60% organic salts, 0.2-0.5% extracting and cutting agents, 0.5-2% fluid loss additives, 1-4% suppress sealing agent, 1-
4% nanometer of sealing agent, 0.2-0.5% fluorocarbon alcohol, 0.5-2.5% polymeric alcohols, 0.5-1% polyetheramines, 1-2% crystalline flake graphites,
3-5% superfine light calcium carbonate, 190-260% barites；Above percentage composition is in terms of the mass content of water.
2. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the antisaline soil
For modified meerschaum or attapulgite.
3. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the organic salt
For potassium formate and/or sodium formate.
4. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the extracting and cutting agent
For xanthans, welan gum or chitosan.
5. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the filtrate reducing
Agent is carboxymethyl cellulose or polyanion cellulose.
6. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that described to suppress envelope
Blocking agent is albino bitumen, sulfonated gilsonite.
7. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the nanometer envelope
Blocking agent is vinyl acetate-ethylene copolymerization compound emulsion, butylbenzene nanoemulsions, polycarbonate nano emulsion and surface-modified nano two
One or more in silica.
8. as claimed in claim 7 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the acetic acid second
Alkene-ethylene copolymer emulsion is vinyl acetate-ethylene copolymerization compound emulsion of the particle diameter in 100-200nm；Butylbenzene nanoemulsions
It is styrene-butadiene emulsion of the particle diameter in 50-100nm；Polycarbonate nano emulsion is polycarbonate emulsion of the particle diameter in 50-100nm；Table
Face modified manometer silicon dioxide is silica of the particle diameter in 50-80nm of surface modification.
9. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that the fluorocarbon alcohol
For tetrafluoro butanediol, five fluorine propyl alcohol or hexafluoroisopropanol.
10. as claimed in claim 1 strengthen the organic salt drilling fluid suppressed with sealing characteristics, it is characterised in that described ultra-fine
Precipitated calcium carbonate is the superfine light calcium carbonate of 600 mesh, 1250 mesh and 2500 mesh according to 1:1-2:1-2 ratios compounding forms.
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| CN113583638A (en) * | 2021-09-13 | 2021-11-02 | 洲际海峡能源科技有限公司 | Calcium-based saline water polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid and preparation and application thereof |
| CN113583638B (en) * | 2021-09-13 | 2023-06-23 | 洲际海峡能源科技有限公司 | Calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid, and preparation and application thereof |
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| CN113897187B (en) * | 2021-11-27 | 2022-04-22 | 石家庄华莱鼎盛科技有限公司 | Polymer clean drilling fluid system |
| CN115322759A (en) * | 2022-09-14 | 2022-11-11 | 中国石油大学(华东) | Temperature-resistant and salt-resistant modified nano graphite jelly dispersion system with strong self-growth effect, jelly dispersion, and preparation method and application thereof |
| US11959012B1 (en) | 2022-09-14 | 2024-04-16 | China University Of Petroleum (East China) | Temperature-resistant and salt-resistant modified nano-graphite dispersed particle gel system with strong self-growth effect |
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