CN106479458A - A kind of pair of film pressure-bearing water-base drilling fluid - Google Patents
A kind of pair of film pressure-bearing water-base drilling fluid Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
Abstract
The invention discloses a kind of pair of film pressure-bearing water-base drilling fluid, according to the mass fraction, comprise following material：Water：1000 parts, bentonite：10～30 parts, soda：5～10 parts, sealing agent：20～30 parts, film former：30～50 parts, coating agent：2～5 parts, shale inhibitor：30～50 parts, pH regulator：5～10 parts, flow pattern regulator：5～20 parts, fluid loss additive：10～40 parts and borehole wall stabilizer：20～30 parts；Salt and barite can be properly added regulation as needed；Double film pressure-bearing water-base drilling fluids of the present invention solve the particular/special requirement to drilling fluid for the shale gas drilling well, especially solve the problems, such as to miss with wellbore stability it is adaptable to the drilling well that big well opened by shale gas well two requires.
Description
Technical field
The present invention relates to shale gas exploitation drilling liquid technology, more particularly to a kind of pair of film pressure-bearing water-base drilling fluid.
Background technology
China's shale gas resources technologically recoverable reserves reach 10.3 × 1012～47.0 × 1012m3, have good surveying
Visit DEVELOPMENT PROSPECT, once successfully scale exploration and development, can effectively alleviate China's oil gas imbalance between supply and demand, therefore shale gas
Exploration and exploitation have become as " 12 " country Major Strategic.Domestic main by using mandatory water base drilling fluid system with
Keep the borehole wall stability of shale formation, such as Chinese invention patent (publication number 105331338A：Publication date：2016-02-17) report
A kind of document of the entitled Anti-leakage type high performance water-based drilling fluid in road and preparation method thereof, water-base drilling fluid bag disclosed in the document
Include water, highly efficient depressor, sodium micron sealing agent, highly-efficient lubricant, viscosifier, fluid loss additive, activity controlling agent, heavy weight additive, system
The standby water-base drilling fluid obtaining has strong rejection capability, and low-shear rate viscosity is high, and seal-off effect is strong, and lubricity is good, disclosure satisfy that hard
The drilling well skill of the easily bad ground such as borehole well instability, leakage and high angle hole or even the horizontal well such as fragile shale, microcrack growth
Art requires, but the difficult problem big wellbore section leakiness opened for shale gas two, easily collapses, it is difficult to meet to drilling fluid density, lubrication
The requirement of property, anti-blocking property and anti-collapse property.
Content of the invention
For solving the above problems, a kind of pair of film pressure-bearing water-base drilling fluid of the present invention, there is provided double film pressure-bearing water-based drillings
Lyolysis is determined the particular/special requirement to drilling fluid for the shale gas drilling well, especially solves the problems, such as leakage and wellbore stability it is adaptable to shale
The drilling well that big well left by gas well two requires.
Double film pressure-bearing water-base drilling fluids of the present invention, according to the mass fraction, comprise following material：Water：1000 parts, swelling
Soil：10～30 parts, soda：5～10 parts, sealing agent：20～30 parts, film former：30～50 parts, coating agent：2～5 parts, mud shale
Inhibitor：30～50 parts, pH regulator：5～10 parts, flow pattern regulator：5～20 parts, fluid loss additive：10～40 parts steady with the borehole wall
Determine agent：20～30 parts；Salt and barite can be properly added regulation as needed.
Further, described sealing agent be with bore sealing agent, the anti-collapse sealing agent of inorganic polymer, granularity be 500 mesh～
One of CaCO3 mixture of 2000 mesh or two or more mixture；Described is ZTC-1, HTK-1, YHS-1 with boring sealing agent
One of or two or more mixture, specifically, described ZTC-1, HTK-1, YHS-1 with bore sealing agent be modified shallow lake
The natural materials such as powder, cellulose, plant gum, humic acid, lignin and roasting glue are skeleton, add organic polymer, weak crosslinking gathers
Compound and the solid wall material of bonding prepare, and can play that adhesion-promoting, filtrate reducing, fall be glutinous, anti-collapse and the work such as leak stopping in drilling fluid
With.
Specifically, the anti-collapse sealing agent of described inorganic polymer is modified sulfonated gilsonite.
Further, described film former is BT-100 water-based film-forming sealing agent.
Further, described coating agent is to be coated inhibitor binary polymer anti-sloughing agent by force, described is coated by force inhibitor two
First polymer anti-sloughing agent comprise hydrolyze poly- propionic acid amide. and polyacrylic acid natrium potassium salt bipolymer, degree of hydrolysis be 30～
80%, the molecular weight of described bipolymer is 2,000,000～7,000,000.
Further, described shale inhibitor is one of KCl, polymeric alcohol or two kinds of mixture；Described flow pattern is adjusted
Section agent is xanthan gum, height glues one of carboxymethyl cellulose or two kinds of mixture.
Specifically, described polymeric alcohol is ethylene glycol, Polyethylene Glycol, polypropylene glycol and oxirane and expoxy propane generates
Fatty alcohol-polyoxyethylene ether or fatty alcohol polyoxypropylene ether.
Further, described fluid loss additive be low viscous carboxymethyl cellulose, in carboxymethyl starch, modified sulfonated gilsonite
One or more mixture.
Further, described borehole wall stabilizer is one of chemical borehole wall stabilizer HQ-1, Colophonium or two kinds of mixture.
Further, described pH regulator is one of sodium hydroxide, potassium hydroxide or two kinds of mixture；
Further, described salt is sodium chloride, and the density of described barite is 4.0～4.2g/cm3.
Specifically, the preparation method of a kind of pair of film pressure-bearing water-base drilling fluid, follows the steps below；
Step one：The water of above-mentioned mass fraction, soda, alkali and bentonite are put in mud cap stirring, prehydration 25～
30 hours；
Step 2：It is slowly added to fluid loss additive, popular regulator, wellbore stability successively in the bentonite slurry of prehydration
Agent, sealing agent, coating agent, shale control agent, after stirring, add film former under the rotating speed of 500r/min；
Step 3：Adjust drilling liquid pH value with pH regulator between 10～12, further according to needing to add salt and barite.
Beneficial effect：
(1) whole two open big wellbore section drilling fluid density and be less than 1.20g/cm3, hole stability, smooth, ratio of dynamic shear force/yield value to plastic viscosity is more than
0.15, yield value is more than 5Pa, and plastic viscosity is less than 30mPa s, and in API, filter pressing vector is less than 5.0mL, and sealing ratiod reaches 90%
More than；
(2) antifouling property of the drilling fluid of the present invention preferably, has good rejection, mud shale rolling rate of recovery
Reach more than 90%；There is preferable greasy property, lubricating coefficient is less than 0.10.Temperature applicable range is wide, and 50 DEG C -150 DEG C all
Can apply.
(3) drilling fluid of the present invention has preferable leak preventing effect, and application well does not occur leakage etc. in leakiness stratum drilling
Complex situations；And offset well misses mud 2424.74m3 in same layer position, have lost substantial amounts of time and cost.
Specific embodiment
In order to preferably realize the present invention, with reference to specific embodiment, technical scheme is made further
Explanation.
Embodiment 1
By weight, 1000 parts of water, 5 parts of soda and 10 parts of bentonite, under 500r/min, pre- water are added in mud cap
Change 25 hours, sequentially add in the bentonite slurry after prehydration and be slowly added to 10 parts of low viscosity carboxymethyl celluloses and carboxylic successively
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of methyl starch：Carboxymethyl starch=1:10), 5 parts of xanthan gum
Mixture (preferred mass ratio, xanthan gum with high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:10), 20 parts of wells
Wall stabilizer HQ-1,20 parts of sealing agent ZTC-1,2 parts of degree of hydrolysis are 30% poly- propionic acid amide. and the binary of polyacrylic acid natrium potassium salt
(preferred polymeric alcohol is ethylene glycol, poly- second two to the mixture of copolymer (molecular weight is preferably 2,000,000), 30 parts of KCl and polymeric alcohol
The fatty alcohol-polyoxyethylene ether that alcohol, polypropylene glycol, glycerol and oxirane generate, and mass ratio, KCl：Polymeric alcohol=1:1),
After stirring under the rotating speed of 500r/min, add 30 parts of BT-100 water-based film-forming sealing agents；It is eventually adding pH adjustment
It is 10 that 5 parts of agent sodium hydroxide adjusts drilling liquid pH value.
So that above-mentioned system is stirred, then add 50% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.10g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 1, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
PV：The plastic viscosity of drilling fluid, mPa s；
YP：The yield value of drilling fluid, Pa；
YP/PV：The ratio of dynamic shear force/yield value to plastic viscosity of drilling fluid；
FL：Middle pressure dehydration under normal temperature for the drilling fluid, ml；
Admittedly containing：Whole contents of water-insoluble and solubility salt, % in drilling fluid；
MBT：Drilling fluid remove native content, g/l；
GEL：The gel strength of drilling fluid, Pa；
HSL：Rolling rate of recovery in drilling fluid for the mud shale, % (method being used to the inhibition of appraisal drilling liquid, heat
Yield of rolling back is higher, represents that inhibition is stronger)；
XS：The lubricating coefficient of drilling fluid, dimensionless；
API：Dehydration, mL is pressed in room temperature；
HTHP：High Temperature High Pressure dehydration, mL；
LSRV：Low-shear rate viscosity, mPa.s.
Property of drilling fluid assay method is executed according to following petroleum industry standard：
1st, industrial gas oil drilling fluid on-the-spot test Part I water-base drilling fluid GB/T16783.1-2006 (PV,
YP, GEL, API parameter executes according to this standard)；
2nd, shale control agent evaluation methodology SY/T6335-1997 (heat rolls back yield according to this standard execution)；
Table 1 is the drilling fluid property test data in embodiment 1：
Embodiment 2
By weight, 1000 parts of water, 6 parts of soda and 10 parts of bentonite, under 500r/min, pre- water are added in mud cap
Change 26 hours, sequentially add in the bentonite slurry after prehydration and be slowly added to 15 parts of low viscosity carboxymethyl celluloses and carboxylic successively
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of methyl starch：Carboxymethyl starch=1:5), 10 parts of xanthan gum
Mixture (preferred mass ratio, xanthan gum with high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:8), 25 parts of wells
Wall stabilizer HQ-1,22 parts of sealing agent HTK-1,4 parts of degree of hydrolysis are 40% poly- propionic acid amide. and the binary of polyacrylic acid natrium potassium salt
(preferred polymeric alcohol is ethylene glycol, poly- second two to the mixture of copolymer (molecular weight is preferably 4,000,000), 35 parts of KCl and polymeric alcohol
The fatty alcohol polyoxypropylene ether that alcohol, polypropylene glycol, glycerol and expoxy propane generate, and mass ratio, KCl：Polymeric alcohol=1:2),
After stirring under the rotating speed of 500r/min, add 35 parts of BT-100 water-based film-forming sealing agents；It is eventually adding pH adjustment
It is 12 that 8 parts of agent sodium hydroxide adjusts drilling liquid pH value.
So that above-mentioned system is stirred, then add 60% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.12g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 2, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
Table 2 is the drilling fluid property test data in embodiment 2：
Table 3 is that embodiment 2 applies well property of drilling fluid
Embodiment 3
By weight, 1000 parts of water, 7 parts of soda and 15 parts of bentonite, under 500r/min, pre- water are added in mud cap
Change 26 hours, sequentially add in the bentonite slurry after prehydration and be slowly added to 20 parts of low viscosity carboxymethyl celluloses and carboxylic successively
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of methyl starch：Carboxymethyl starch=1:3), 15 parts of xanthan gum
Mixture (preferred mass ratio, xanthan gum with high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:5), 20 parts of wells
Wall stabilizer HQ-1,25 parts of sealing agent YHS-1,5 parts of degree of hydrolysis are 50% poly- propionic acid amide. and the binary of polyacrylic acid natrium potassium salt
(preferred polymeric alcohol is ethylene glycol, poly- second two to the mixture of copolymer (molecular weight is preferably 5,000,000), 40 parts of KCl and polymeric alcohol
The fatty alcohol polyoxypropylene ether that alcohol, polypropylene glycol, glycerol and expoxy propane generate, and mass ratio, KCl：Polymeric alcohol=1:5),
After stirring under the rotating speed of 500r/min, add 40 parts of BT-100 water-based film-forming sealing agents；It is eventually adding pH adjustment
It is 10 that 10 parts of agent sodium hydroxide adjusts drilling liquid pH value.
So that above-mentioned system is stirred, then add 60% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.05g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 4, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
Table 4 is the hungry drilling fluid property test data in embodiment 3：
Embodiment 4
By weight, 1000 parts of water, 8 parts of soda and 20 parts of bentonite, under 500r/min, pre- water are added in mud cap
Change 30 hours, sequentially add in the bentonite slurry after prehydration and be slowly added to 25 parts of low viscosity carboxymethyl celluloses and carboxylic successively
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of methyl starch：Carboxymethyl starch=1:1), 20 parts of xanthan gum
Mixture (preferred mass ratio, xanthan gum with high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:3), 22 parts of wells
Wall stabilizer HQ-1,28 parts of modified sulfonated gilsonites, 6 parts of degree of hydrolysis be 60% poly- propionic acid amide. and polyacrylic acid natrium potassium salt two
(preferred polymeric alcohol is ethylene glycol, poly- second to the mixture of membered copolymer (molecular weight is preferably 6,000,000), 45 parts of KCl and polymeric alcohol
The fatty alcohol polyoxypropylene ether that glycol, polypropylene glycol, glycerol and expoxy propane generate, and mass ratio, KCl：Polymeric alcohol=1:
8), after, stirring under the rotating speed of 500r/min, 45 parts of BT-100 water-based film-forming sealing agents are added；It is eventually adding pH to adjust
9 parts of regulation drilling liquid pH values of whole dose of sodium hydroxide are 11.
So that above-mentioned system is stirred, then add 60% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.15g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 1, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
Embodiment 5
By weight, 1000 parts of water, 9 parts of soda and 25 parts of bentonite, under 500r/min, pre- water are added in mud cap
Change 30 hours, sequentially add in the bentonite slurry after prehydration and be slowly added to 30 parts of low viscosity carboxymethyl celluloses and carboxylic successively
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of methyl starch：Carboxymethyl starch=1:3), 20 parts of xanthan gum
Mixture (preferred mass ratio, xanthan gum with high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:5), 25 parts of wells
Mixture (preferred mass ratio, the HQ-1 of wall stabilizer HQ-1 and Colophonium：Colophonium=1:1), 30 parts of ZTC-1 and 500 mesh CaCO3
Mixture (preferred mass ratio, ZTC-1：500 mesh CaCO3=1:2), 7 parts of degree of hydrolysis are 70% poly- propionic acid amide. and poly- third
The mixture of the bipolymer (molecular weight is preferably 7,000,000), 50 parts of KCl and polymeric alcohol of olefin(e) acid natrium potassium salt (is preferably polymerized
Alcohol is the fatty alcohol polyoxypropylene ether that ethylene glycol, Polyethylene Glycol, polypropylene glycol, glycerol and expoxy propane generate, and mass ratio,
KCl：Polymeric alcohol=1:8), after, stirring under the rotating speed of 500r/min, 45 parts of BT-100 water-based film-forming closure are added
Agent；Being eventually adding 5 parts of pH regulator sodium hydroxide and adjusting drilling liquid pH value is 11.
So that above-mentioned system is stirred, then add 60% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.13g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 1, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
Embodiment 6
By weight, 1000 parts of water, 10 parts of soda and 30 parts of bentonite are added in mud cap, under 500r/min, in advance
Aquation 30 hours, sequentially add in the bentonite slurry after prehydration be slowly added to successively 40 parts of low viscosity carboxymethyl celluloses and
Mixture (preferred mass ratio, the low viscosity carboxymethyl cellulose of carboxymethyl starch：Carboxymethyl starch=1:3), 20 parts of xanthan
Glue and mixture (preferred mass ratio, the xanthan gum of high viscous carboxymethyl cellulose：High viscous carboxymethyl cellulose=1:1), 30 parts
Mixture (preferred mass ratio, the HQ-1 of borehole wall stabilizer HQ-1 and Colophonium：Mixture=1 of Colophonium:1), 30 parts of ZTC-1 and
Mixture (preferred mass ratio, the HQ-1 of 2000 mesh CaCO3：Colophonium=1:2), 8 parts of degree of hydrolysis be 80% poly- propionic acid amide. and
The mixture of the bipolymer (molecular weight is preferably 8,000,000), 50 parts of KCl and polymeric alcohol of polyacrylic acid natrium potassium salt is (preferably
Polymeric alcohol is the fatty alcohol polyoxypropylene ether that ethylene glycol, Polyethylene Glycol, polypropylene glycol, glycerol and expoxy propane generate, and matter
Amount ratio, KCl：Polymeric alcohol=1:8), after, stirring under the rotating speed of 500r/min, 50 parts of BT-100 water-based film-formings are added
Sealing agent；It is eventually adding 6 parts of pH regulator sodium hydroxide and adjust drilling liquid pH values 11.
So that above-mentioned system is stirred, then add 60% barite (density is 4.2g/cm3)；Stirring is all
Even just obtained density be 1.10g/cm3 double film pressure-bearing water-base drilling fluids.
As shown in table 1, each parameter is all to survey at 50 DEG C to double film pressure-bearing water-base drilling fluid performances that the present embodiment is prepared
Fixed, wherein, before rolling, state is mensure performance after the completion of preparation, and after rolling, state is that the drilling fluid prepared is warm at 100 DEG C
Rolling 16h, is then cooled to room temperature measuring performance；
Table 5 is the experimental performance contrast of embodiment 1 to 6：
The above, be only presently preferred embodiments of the present invention, and not the present invention is done with any pro forma restriction, every according to
Any simple modification above example made according to the technical spirit of the present invention, equivalent variations, each fall within the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of pair of film pressure-bearing water-base drilling fluid it is characterised in that：According to the mass fraction, comprise following material：Water：1000 parts,
Bentonite：10～30 parts, soda：5～10 parts, sealing agent：20～30 parts, film former：30～50 parts, coating agent：2～5 parts, mud
Shale control agent：30～50 parts, pH regulator：5～10 parts, flow pattern regulator：5～20 parts, fluid loss additive：10～40 parts and well
Wall stabilizer：20～30 parts.
2. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described sealing agent is with brill closure
Agent, the anti-collapse sealing agent of inorganic polymer, granularity are one of CaCO3 mixture of 500 mesh～2000 mesh or two or more mixed
Compound；Described is one of ZTC-1, HTK-1, YHS-1 or two or more mixture with boring sealing agent.
3. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described film former is that BT-100 is water base
Film forming sealing agent.
4. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described coating agent is to be coated by force suppression
Agent binary polymer anti-sloughing agent, described be coated by force inhibitor binary polymer anti-sloughing agent comprise hydrolyze poly- propionic acid amide. and polypropylene
The bipolymer of sour natrium potassium salt, degree of hydrolysis is 30～80%, and the molecular weight of described bipolymer is 2,000,000～7,000,000.
5. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described shale inhibitor be KCl,
One of polymeric alcohol or two kinds of mixture；Described flow pattern regulator is xanthan gum, one of high viscous carboxymethyl cellulose or
Two kinds of mixture.
6. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described fluid loss additive is low viscous carboxylic first
One of base cellulose, carboxymethyl starch or two kinds of mixture.
7. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described borehole wall stabilizer is chemical well
One of wall stabilizer HQ-1, Colophonium or two kinds of mixture.
8. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described pH regulator is hydroxide
One of sodium, potassium hydroxide or two kinds of mixture；
9. according to claim 1 pair of film pressure-bearing water-base drilling fluid it is characterised in that：Described salt is sodium chloride, described heavy
The density of spar is 4.0～4.2g/cm3.
10. a kind of pair of film pressure-bearing water-base drilling fluid preparation method it is characterised in that：Follow the steps below；
Step one：Water, soda, alkali and bentonite are put in stirring in mud cap and make bentonite slurry, then carry out prehydration；
Step 2：It is slowly added to fluid loss additive, popular regulator, wellbore stability to prehydration successively in bentonite slurry after finishing
Agent, sealing agent, coating agent, shale control agent, after stirring, add film former；
Step 3：Adjust drilling liquid pH value between 10～12 with pH regulator, add salt and barite, control the close of drilling fluid
Spend for 1.05～1.13g/cm3.
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| CN107541195A (en) * | 2017-08-25 | 2018-01-05 | 克拉玛依市创拓有限责任公司 | Filming water-base drilling fluid and preparation method thereof |
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| CN110157397A (en) * | 2019-05-23 | 2019-08-23 | 新疆格瑞迪斯石油技术股份有限公司 | A kind of drilling fluid nanometer film forming sealing agent and its preparation method and application |
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| CN110257026B (en) * | 2019-06-12 | 2022-01-25 | 中国石油化工股份有限公司 | Protective solution for low-porosity and low-permeability reservoir |
| CN115820227A (en) * | 2021-09-17 | 2023-03-21 | 中国石油天然气股份有限公司 | Borehole wall sealing pressure-bearing drilling fluid and preparation method thereof |
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