CN107057662A - A kind of water-base drilling fluid sealing agent and its preparation method and application - Google Patents
A kind of water-base drilling fluid sealing agent and its preparation method and application Download PDFInfo
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- CN107057662A CN107057662A CN201710045491.5A CN201710045491A CN107057662A CN 107057662 A CN107057662 A CN 107057662A CN 201710045491 A CN201710045491 A CN 201710045491A CN 107057662 A CN107057662 A CN 107057662A
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- drilling fluid
- water
- sealing agent
- base drilling
- agent
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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
- C09K8/06—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
- 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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- 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
Abstract
The invention provides a kind of water-base drilling fluid sealing agent and its preparation method and application, the sealing agent includes the component of following mass percent：Shielding diverting agent：10~30%, stearic acid：1.0~5.0%, ethylene glycol：2~10%, silica：60~80%.This water-base drilling fluid sealing agent prepared by the present invention, excellent sealing characteristics is respectively provided with to hole, microcrack, especially has good plugging effect to the microcrack of shale, can effectively be reduced the transmission of reduction pore pressure, be reduced differential sticking.To water base applicability extensively, compatibility is good.Also there is good compatibility to the water-base drilling fluid of the high solid phase of high density.The sealing characteristics of water-base drilling fluid can be significantly increased, shale gas horizontal well, carbonaceous mudstone horizontal well is met and bores the requirement for the horizontal well for meeting other stratum of easily collapsing.
Description
Technical field
The present invention relates to a kind of water-base drilling fluid sealing agent and its preparation method and application, have to hole, microcrack
There is excellent sealing characteristics, there is the water-base drilling fluid sealing agent of good plugging effect, the closure to the microcrack of shale
Agent can effectively reduce the transmission of reduction pore pressure, reduce differential sticking.
Background technology
With both at home and abroad to using shale gas as mark unconventional gas reservoir large-scale development progress, oil base drilling fluid
Using more and more extensive.Compared with traditional water-base drilling fluid, oil base drilling fluid because its good rejection, greasy property,
Rheological property is able to extensive use in shale gas probing.
But oil base drilling fluid generally existing pollution weight, oil-based drill cuttings processing is difficult, and oil base drilling fluid use cost is high to ask
Topic.Compared with oil base drilling fluid, water-base drilling fluid, which has, pollutes small, low cost and other advantages.Shale gas horizontal well can be using oil
Base drilling fluid and synthetic base drilling fluid, it would however also be possible to employ strong rejection capability water-base drilling fluid, it is desirable to its key be to ensure that wellbore stability,
Lubrication, anti-sticking and well cleaning.
For water-base drilling fluid, it is ensured that the key of borehole wall stability is to provide good shut-off capacity.The instability Mechanism of shale
And feature mainly have it is following some：Pore pressure diffusion is to cause the basic reason of borehole well instability；It is micro- between mud shale mineral grain
Stronger hydration is produced after hole Absorb Water, promotes the generation of secondary microcrack, extend with connecting, Absorb Water produces secondary split
Seam is the one of the main reasons of hard brittle shale stratum borehole well instability；Difference, drilling fluid and the hole of borehole pressure and pore pressure
The difference in chemical potential of clearance flow body, capillary pressure cause filtrate to enter stratum.In terms of closure, it is desirable to which drilling fluid can block mud page
Micropore between rock mineral grain, prevents the generation of secondary microcrack, while keeping alap filter loss.The envelope of conventional
Blocking agent is difficult to closure micropore, microcrack, causes filtrate to enter stratum, causes borehole well instability.
Horizontal patterns are used mostly in order to obtain high yield during shale gas exploration and development.To strengthen anti-collapse property
Energy and well control requirement generally use high density drilling fluid.At this moment drilling fluid seems particularly prominent the problem of in terms of rheological characteristic regulation and control
Go out, conventional sealing agent consumption is big, and there is stronger viscosifying action to high density drilling fluid, be easily caused drilling fluid thickening, lose
Mobility.
The content of the invention
It is an object of the invention to provide a kind of water-base drilling fluid sealing agent and its preparation method and application, existing water is overcome
Seal-off effect that base drilling fluid sealing agent is present is weak, particularly poor to hole, microcrack plugging effect and high density drilling fluid compatibility
The problem of property is poor, heat-resisting property is not good.
The technical scheme is that：A kind of water-base drilling fluid sealing agent, is consisted of the following components in percentage by weight：
Shielding diverting agent, 10~30%；Tackifier, 1.0~5.0%；Antifreeze, 2~10%；Nanometer grade silica dispersion liquid, 60
~80%.
The shielding diverting agent is according to quality percentage by butadiene, styrene, 2- acrylamide-2-methylpro panesulfonic acids
Than 3：1：The polymer of 1 synthesis.
The tackifier are the mixtures of one kind in stearic acid, magnesium stearate, aluminum stearate or two of which.
The antifreeze is the mixture of one or both of ethylene glycol, glycerine.
The particle size range of silica is 10~50nm in the nanometer grade silica dispersion liquid.
A kind of preparation method of water-base drilling fluid sealing agent, takes nanometer grade silica dispersion liquid to add reaction vessel,
Under the conditions of 80 DEG C, 60~120r/min, shielding diverting agent is added into nanometer grade silica dispersion liquid while stirring, and stir
30 min are mixed, tackifier are then added into solution, maintenance temperature 70 C continues to stir stopping heating after 20 min, finally added
Enter antifreeze, continue to stir 10 min, be cooled to room temperature, complete the preparation of water-base drilling fluid sealing agent,
The addition of above raw material is added according to formula ratio.
A kind of application of water-base drilling fluid sealing agent, the sealing agent is used to prepare water-base drilling fluid, closure shale and
The crack of carbonaceous mudstone, microcrack, water-base drilling fluid are well mixed obtained by the component of following mass percent：3% closure
Agent, 1% low adhesive aggregation anionic cellulose, 2% CMS, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% weight are brilliant
Stone and 75.8% water.
This water-base drilling fluid sealing agent that the present invention is provided has following prominent compared with conventional drilling fluid sealing agent
Go out advantage：
1st, excellent sealing characteristics, can effectively block shale, the crack of carbonaceous mudstone, microcrack, meet shale, carbonaceous mudstone
Requirement to drilling fluid anti-sloughing performance, makes its caving-preventing characteristic suitable with oil base drilling fluid；
2nd, with good filtrate loss controllability, the normal temperature and pressure filter loss and HTHP leak-off of water-base drilling fluid can be reduced
Amount, quickly forms mud cake, contributes to improvement of mud cake；
3rd, compatibility is good, has good compatibility, the rheology impact to drilling fluid in high-density water-based drilling fluid
It is small, the viscous of high density drilling fluid will not be dramatically increased and cut, be conducive to rheological characteristic to regulate and control；
4th, heat-resisting property is good, and excellent plugging effect can be also provided under high temperature, and the good high temperature of heat endurance is not easily decomposed.
The present invention is described in further details below with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is the sealing characteristics comparison diagram of the drilling fluid containing sealing agent and traditional drilling fluid；
Fig. 2 is the mud cake for adding sealing agent formation；
Fig. 2-1 is the mud cake for not adding sealing agent formation；
Fig. 3 is the comparison diagram that blank base slurry oozes the time with adding the first drop filtrate of different content sealing agent base slurry；
Fig. 4 is high temperature and high pre ssure filtration comparison diagram of the blank base slurry with adding different content sealing agent base slurry；
Fig. 5 is the heat-resisting property comparison diagram of drilling fluid before and after addition sealing agent；
Fig. 6 is the repression of swelling performance comparison figure of sealing agent and traditional additive for drilling fluid.
Embodiment
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：
Shielding diverting agent, 10~30%；Tackifier, 1.0~5.0%；Antifreeze, 2~10%；Nanometer grade silica dispersion liquid, 60
~80%.
The shielding diverting agent is according to quality percentage by butadiene, styrene, 2- acrylamide-2-methylpro panesulfonic acids
Than 3：1：The polymer of 1 synthesis.
The tackifier are the mixtures of one kind in stearic acid, magnesium stearate, aluminum stearate or two of which.
The antifreeze is the mixture of one or both of ethylene glycol, glycerine.
The particle size range of silica is 10~50nm in the nanometer grade silica dispersion liquid.
A kind of preparation method of water-base drilling fluid sealing agent, takes nanometer grade silica dispersion liquid to add reaction vessel,
Under the conditions of 80 DEG C, 60~120r/min, shielding diverting agent is added into nanometer grade silica dispersion liquid while stirring, and stir
30 min are mixed, tackifier are then added into solution, maintenance temperature 70 C continues to stir stopping heating after 20 min, finally added
Enter antifreeze, continue to stir 10 min, be cooled to room temperature, complete the preparation of water-base drilling fluid sealing agent,
The addition of above raw material is added according to formula ratio.
A kind of application of water-base drilling fluid sealing agent, the sealing agent is used to prepare water-base drilling fluid, closure shale and
The crack of carbonaceous mudstone, microcrack, water-base drilling fluid be by following mass percent well mixed obtained 3% sealing agent of component,
1% low adhesive aggregation anionic cellulose, 2% CMS, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite
With 75.8% water.
It should be noted that be to strengthen the viscosity of sealing agent as the stearic acid, magnesium stearate and aluminum stearate of tackifier,
And be then to reduce the condensation point of sealing agent, prevent it from solidifying as the ethylene glycol of antifreeze, glycerine；Nano silicon point
Dispersion liquid, particle size range 10-50nm belongs to commercially available prod, belongs to prior art, being can be directly in the raw material bought on the market；Screen
It is G325 to cover diverting agent, is the polymer synthesized by butadiene, styrene and 2- acrylamide-2-methylpro panesulfonic acids, three
Mass percent be butadiene：Styrene：2- acrylamide-2-methylpro panesulfonic acid=3：1：1.
Embodiment 1：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 10%；Aluminum stearate, 2%；Glycerine, 8%；Nanometer grade silica dispersion liquid, 80%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 2：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 12%；Magnesium stearate, 3%；Ethylene glycol, 7%；Nanometer grade silica dispersion liquid, 78%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 3：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 3%；Aluminum stearate, 1%；Ethylene glycol, 9%；Nanometer grade silica dispersion liquid, 77%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 4：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 15%；Stearic acid, 5%；Ethylene glycol, 5%；Nanometer grade silica dispersion liquid, 75%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 5：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 17%；Aluminum stearate and stearic acid mixture, 5%；Ethylene glycol, 10%；Nanometer grade silica dispersion liquid, 68%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 6：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 19%；Aluminum stearate and magnesium stearate mixture, 2.5%；Ethylene glycol, 5.5%；Nanometer grade silica dispersion liquid, 73%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 7：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 20%；Stearic acid, 4%；Ethylene glycol, 6%；Nanometer grade silica dispersion liquid, 70%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 8：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 23%；Magnesium stearate, 3.5%；Glycerine, 3%；Nanometer grade silica dispersion liquid, 70.5%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 9：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 25%；Magnesium stearate and aluminum stearate mixture, 4.5%；Glycerine, 4%；Nanometer grade silica dispersion liquid, 66.5%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 10：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 28%；Stearic acid, 5%；Ethylene glycol and glycerol mixture, 5%；Nanometer grade silica dispersion liquid, 62%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 11：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 30%；Stearic acid, 2%；Ethylene glycol, 8%；Nanometer grade silica dispersion liquid, 60%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 12：
A kind of water-base drilling fluid sealing agent is present embodiments provided, is consisted of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 10%；Stearic acid, 5%；Ethylene glycol, 5%；Nanometer grade silica dispersion liquid, 80%.
Above-mentioned water-base drilling fluid is with the preparation method of sealing agent：By proportioning, nanometer grade silica dispersion liquid is taken to add
Three-necked flask, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent.
The sealing agent prepared is used for crack, the microcrack for preparing water-base drilling fluid, closure shale and carbonaceous mudstone, water base
Drilling fluid is component well mixed obtained 3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% carboxylic by following mass percent
Methyl starch, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite, 10% barite and 75.8% water.
Embodiment 13：
The present embodiment randomly selects the experiment that some of 1~embodiment of embodiment 12 embodiment carries out sealing agent performance, specifically
Process of the test and result of the test it is as follows.
First, embodiment 11 is chosen, following test is carried out to it：
Test 1：Water-base drilling fluid is prepared by the proportioning of embodiment 11 and carries out the sealing characteristics test of drilling fluid.
Seal up the water-based drilling formula of liquid of blocking agent：The low CMS of adhesive aggregation anionic cellulose+2% of 3% sealing agent+1%+
The water of+10% barite of 0.2% sodium hydroxide+3% sulfonated gilsonite of+5% potassium chloride+75.8%.
The water-based drilling formula of liquid of blocking agent is not sealed up：0.3% high adhesive aggregation anionic cellulose（PAC-HV）+ 0.3% low adhesive aggregation
Anionic cellulose（PAC-LV）+ 10% barite of potassium chloride of+0.3% xanthans XCD+0.2% sodium hydroxides+3%+excess water.
The spurt that instrument test adds drilling fluid before and after sealing agent is blocked using OFITE permeability, contrast adds envelope
The sealing characteristics of drilling fluid before and after blocking agent, as a result as shown in figure 1, by formula（1）Calculate spurt.
…………………………………………………（1）
In formula：V0 is spurt, mL；
V7.5 is 7.5min high temperature and high pre ssure filtration, mL；
V30 is 30min high temperature and high pre ssure filtration, mL.
Result is understood as shown in Figure 1, and sealing agent prepared by the raw material as selected by embodiment 11 can significantly reduce drilling fluid
Spurt, the spurt for adding the drilling fluid of the sealing agent prepared does not seal up the drilling fluid of blocking agent, table far smaller than
The bright sealing agent can reduce the intrusion of filtrate in frosted panel surface formation mud cake, help to suppress the generation of secondary microcrack,
Extension is with connecting, so as to play anti-collapse effect.
The result shown in Fig. 2 and Fig. 2-1, adds the smooth densification of mud cake of the drilling fluid formation of sealing agent, does not add
The mud cake of the drilling fluid formation of sealing agent is coarse loose.
Test 2：Water-base drilling fluid, which is prepared, by embodiment 11 and blank base slurry is contrasted is starched with adding different content sealing agent base
First drop filtrate ooze the time.
Press《The industrial gas oil drilling fluid on-the-spot test part 1s of GB/T 16783.2-2014:Water-based drilling
Liquid》In the filter loss of water-base drilling fluid that configures of regulation testing example 11, the time is oozed as commenting using the first drop filtrate
Valency index, is as a result shown in Fig. 3.
From above-mentioned test result, what the blank base slurry first for not adding the present embodiment sealing agent dripped filtrate oozes the time
Only 18s, adding the time that oozes of the first drop filtrate of drilling fluid after 3% sealing agent increases to 192s, and first drips oozing for filtrate
Time dramatically increases, show sealing agent prepared by embodiment 11 can quick blocking, form mud cake, advantageously reduce filtrate pair
The infringement on stratum, so as to play a part of anti-collapse, stabilizing borehole.
Test 3：Water-base drilling fluid, which is prepared, by embodiment 11 and HTHP drop is carried out considers mistake performance test.
The water-base drilling fluid prepared according to embodiment 11 is pressed after heat rolling 16h at a temperature of 120 DEG C《GB/T
16783.2-2014 industrial gas oil drilling fluid on-the-spot test part 1s:Water-base drilling fluid》In regulation using sea
The high temperature and high pre ssure filtration for the water-base drilling fluid that sensible high pressure high temperature filter tester testing example 11 is configured, refers in this, as evaluation
Mark, is as a result shown in Fig. 4.
From test result, the drilling fluid of the present embodiment sealing agent is not added（Base is starched）High temperature and high pre ssure filtration be up to
The high temperature and high pre ssure filtration of drilling fluid is reduced to 2.0mL after 16mL, plus the sealing agent of 3% embodiment 11.Show the sealing agent of embodiment 11
The high temperature and high pre ssure filtration of drilling fluid can be effectively reduced, good closure can be also provided under conditions of the HTHP of shaft bottom
Performance.
Binding test 1 and the experimental result of test 2 understand that the sealing agent of embodiment 11 has excellent sealing characteristics, especially
It is quick blocking ability, can quickly reduces leak-off, intrusion of the filtrate to stratum is prevented, so as to prevent the aquation of mud shale swollen
It is swollen.The present embodiment sealing agent can significantly improve drilling fluid has good closure to shale, the crack of carbonaceous mudstone, microcrack
Performance, is allowed to be adapted to shale gas horizontal well, bores the horizontal well for meeting the big heterogeneous carbonaceous mudstone of section, crushed zone or other stratum of easily collapsing
The requirement constructed to water-base drilling fluid sealing characteristics.
2nd, embodiment 7 is chosen, following test is carried out to it：
Test 4：Water-base drilling fluid is prepared by the proportioning of embodiment 7 and carries out compatibility test.
Seal up the water-based drilling formula of liquid of blocking agent：The low CMS of adhesive aggregation anionic cellulose+2% of 3% sealing agent+1%+
The water of+10% barite of 0.2% sodium hydroxide+3% sulfonated gilsonite of+5% potassium chloride+75.8%.
The water-based drilling formula of liquid of blocking agent is not sealed up：1.0% low adhesive aggregation anionic cellulose（PAC-LV）+ 2.0% carboxymethyl
+ 58% barite of sulfonated gilsonite of+5% potassium chloride of the sodium hydroxide of starch+0.2%+3%+excess water.
The water-base drilling fluid prepared by embodiment 7, after heat rolling 16h at a temperature of 120 DEG C, is pressed《GB/T 16783.2—
2014 industrial gas oil drilling fluid on-the-spot test part 1s：Water-base drilling fluid》In regulation carry out rheological property survey
Examination, respectively using rheological property as evaluation index, investigates sealing agent to the compatibility of high density drilling fluid, the results are shown in Table 1.
The rheological property table of the high density drilling fluid of table 1
| Density, g/cm3 | Apparent viscosity, mPa.s | Plastic viscosity, mPa.s | Yield value, Pa | High temperature and high pre ssure filtration, mL | |
| Base is starched | 2.00 | 97.5 | 78 | 19.5 | 6.0 |
| Base starches+1% sealing agent | 2.00 | 97 | 78 | 19 | 4.0 |
| Base starches+2% sealing agent | 2.00 | 95 | 78 | 17 | 2.4 |
| Base starches+3% sealing agent | 2.00 | 93 | 79 | 14 | 1.6 |
Base slurry in table 1 refers to the potassium chloride+3% of 1%+0.2% sodium hydroxide of low+2% CMS of adhesive aggregation anionic cellulose+5%
The water of the barite of sulfonated gilsonite+10%+75.8%, from the data of table 1, sealing agent has good compatibility to drilling fluid,
The sealing agent of embodiment 7 is added in high-density water-based drilling fluid, the rheological property of high density drilling fluid is not also bad
Influence, does not occur the thickening bad phenomenon such as cause mobility to be lost, it is to avoid be forced to use in high density drilling fluid field application
Macrodilution, reduces mud emission, reduces drilling cost.
3rd, embodiment 12 is chosen, following test is carried out to it：
Test 5：Water-base drilling fluid is prepared by the proportioning of embodiment 12 and carries out heat-resisting property test.
Seal up the water-based drilling formula of liquid of blocking agent：The low CMS of adhesive aggregation anionic cellulose+2% of 3% sealing agent+1%+
The water of+10% barite of 0.2% sodium hydroxide+3% sulfonated gilsonite of+5% potassium chloride+75.8%.
The water-based drilling formula of liquid of blocking agent is not sealed up：1.0% low adhesive aggregation anionic cellulose（PAC-LV）+ 2.0% carboxymethyl
+ 58% barite of sulfonated gilsonite of+5% potassium chloride of the sodium hydroxide of starch+0.2%+3%+excess water.
The spurt that instrument test adds drilling fluid before and after sealing agent is blocked using OFITE permeability, contrast adds envelope
The sealing characteristics of drilling fluid before and after blocking agent.As a result it is as shown in Figure 5.By formula（1）Calculate spurt.
As shown in Figure 5, sealing agent has good heat-resisting property.The drilling fluid prepared using the sealing agent of embodiment 12 is existed
Still there is good sealing characteristics after 150 DEG C of heat rollings, spurt is only 5.2mL, do not seal up blocking agent preparation far smaller than
Drilling fluid spurt.The drilling fluid spurt for not sealing up blocking agent preparation is 18.6mL.Above-mentioned result of the test shows, seals
Also excellent plugging effect can be provided under blocking agent high temperature, the good high temperature of heat endurance is not easily decomposed.Overcome current common drilling fluid
Sealing agent heat endurance is poor, at high temperature labile shortcoming.
4th, prepare sealing agent by the proportioning of embodiment 4 and carry out clay swell performance comparison processed and test.
Seal up the water-based drilling formula of liquid of blocking agent：The low CMS of adhesive aggregation anionic cellulose+2% of 3% sealing agent+1%+
The water of+10% barite of 0.2% sodium hydroxide+3% sulfonated gilsonite of+5% potassium chloride+75.8%.
The water-based drilling formula of liquid of blocking agent is not sealed up：1.0% low adhesive aggregation anionic cellulose（PAC-LV）+ 2.0% carboxymethyl
+ 58% barite of sulfonated gilsonite of+5% potassium chloride of the sodium hydroxide of starch+0.2%+3%+excess water.
The suppression clay swell performance of different inhibitor is tested using OFITE linear expansions instrument and is contrasted, as a result
As shown in Figure 6.
It will be appreciated from fig. 6 that the present embodiment sealing agent quickly can be embedded in micropore, microcrack by the small advantage of particle diameter,
And carry out it is deformable closure form firm plugged zone, be provided simultaneously with certain hydrophobic effect.Both prevent invading for water at mutually collaboration
Enter, therefore the linear expansion rate of clay is relatively low.Result of the test shows that the present embodiment sealing agent has good suppression clay swell
Performance.The expansion rate of clay reaches 70% in clear water after 16 hours, and the clay swell rate for adding the present embodiment sealing agent is only
27.8%.The drilling fluid inhibitor that respectively less than potassium chloride, sodium formate, polyamine etc. are commonly used.
There is excellent sealing characteristics it is an object of the invention to provide a kind of water-base drilling fluid sealing agent, it is especially right
Shale, the crack of carbonaceous mudstone, microcrack have good sealing characteristics.And be especially suitable for shale gas horizontal well, bore and meet big section
Requirement of the horizontal well construction on heterogeneous carbonaceous mudstone or other stratum of easily collapsing to water-base drilling fluid sealing characteristics, significantly increases water
The sealing characteristics of base drilling fluid, makes its performance close to oil base drilling fluid.
Water-base drilling fluid sealing agent provided by the present invention has following protrusion compared with conventional drilling fluid sealing agent
Advantage：1st, excellent sealing characteristics, can effectively block shale, the crack of carbonaceous mudstone, microcrack, meet shale, carbonaceous mud
Requirement of the rock to drilling fluid anti-sloughing performance, makes its caving-preventing characteristic suitable with oil base drilling fluid；2nd, with good filtrate loss controllability.
The normal temperature and pressure filter loss and high temperature and high pre ssure filtration of water-base drilling fluid can be reduced, mud cake is quickly formed, helps to improve mud
Cake quality；3rd, compatibility is good, has good compatibility in high-density water-based drilling fluid, to the rheological characteristic shadow of drilling fluid
Sound is small, will not dramatically increase the viscous of high density drilling fluid and cut, be conducive to rheological characteristic to regulate and control；4th, heat-resisting property is good, also can under high temperature
Excellent plugging effect is provided, the good high temperature of heat endurance is not easily decomposed.
The present invention can strengthen the caving-preventing characteristic of drilling fluid, applied to shale gas horizontal well, bore and meet carbonaceous mudstone, other stratum
Unstable horizontal well, substantially meet horizontal well horizontal segment construction in water-base drilling fluid caving-preventing characteristic an urgent demand.
The technology can make to substitute using water-base drilling fluid in the national shale gas demonstration area in Changning-Weiyuan and the anti-turn-key projects in shell Sichuan
Oil base drilling fluid, large-scale application；The exploitation of the tight gas reservoir of shale gas gas reservoir and the Northwest for southwest provides skill
Art is supported, drilling cost can be significantly reduced again, meets environmental requirement, is obtained good economic benefit and social benefit, is worth pushing away
Wide application.
It is exemplified as above be only to the present invention for example, do not constitute the limitation to protection scope of the present invention, it is all
It is to be belonged to the same or analogous design of the present invention within protection scope of the present invention.The portion that the present embodiment is not described in detail
Part and structure belong to the well-known components and common structure or conventional means of the industry, do not describe one by one here.
Claims (7)
1. a kind of water-base drilling fluid sealing agent, it is characterised in that consist of the following components in percentage by weight：Shielding is temporarily stifled
Agent, 10~30%；Tackifier, 1.0~5.0%；Antifreeze, 2~10%；Nanometer grade silica dispersion liquid, 60~80%.
2. water-base drilling fluid sealing agent as claimed in claim 1, it is characterised in that the shielding diverting agent is by fourth two
Alkene, styrene, 2- acrylamide-2-methylpro panesulfonic acids are according to mass percent 3：1：The polymer of 1 synthesis.
3. water-base drilling fluid sealing agent as claimed in claim 1, it is characterised in that the tackifier are stearic acid, tristearin
The mixture of one kind or two of which in sour magnesium, aluminum stearate.
4. water-base drilling fluid sealing agent as claimed in claim 1, it is characterised in that the antifreeze is ethylene glycol, the third three
The mixture of one or both of alcohol.
5. water-base drilling fluid sealing agent as claimed in claim 1, it is characterised in that the nanometer grade silica dispersion liquid
The particle size range of middle silica is 10~50nm.
6. a kind of preparation method of water-base drilling fluid sealing agent, it is characterised in that take nanometer grade silica dispersion liquid to add
Reaction vessel, under the conditions of 80 DEG C, 60~120r/min, adds shielding temporary into nanometer grade silica dispersion liquid while stirring
Blocking agent, and 30 min of stirring, tackifier are then added into solution, temperature 70 C is maintained, and are continued to stir stopping after 20 min and are added
Heat, is eventually adding antifreeze, continues to stir 10 min, is cooled to room temperature, completes the preparation of water-base drilling fluid sealing agent,
The addition of above raw material is added according to formula ratio.
7. a kind of application of water-base drilling fluid sealing agent, it is characterised in that the sealing agent is used to prepare water-base drilling fluid, seals
Crack, the microcrack of stifled shale and carbonaceous mudstone, water-base drilling fluid are well mixed obtained by the component of following mass percent：
3% sealing agent, 1% low adhesive aggregation anionic cellulose, 2% CMS, 0.2% sodium hydroxide, 5% potassium chloride, 3% sulfonated gilsonite,
10% barite and 75.8% water.
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Application publication date: 20170818 |