CN115584251A - Strong plugging drilling fluid and preparation method thereof - Google Patents
Strong plugging drilling fluid and preparation method thereof Download PDFInfo
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- CN115584251A CN115584251A CN202110763554.7A CN202110763554A CN115584251A CN 115584251 A CN115584251 A CN 115584251A CN 202110763554 A CN202110763554 A CN 202110763554A CN 115584251 A CN115584251 A CN 115584251A
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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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- 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
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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
- C09K8/48—Density increasing or weighting additives
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- 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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention discloses a strong plugging drilling fluid which comprises the following components in parts by weight: 100 parts of water, 2-8 parts of bentonite, 4-10 parts of a viscosity reducer, 1-9 parts of a calcium-resistant filtrate reducer, 10-30 parts of a plugging agent, 2-10 parts of a lubricant and 20-40 parts of a weighting agent; the calcium-resistant fluid loss additive comprises the following components in parts by weight: 40 parts of water, 5-7 parts of maleic anhydride, 10-12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6-8 parts of acrylamide and 14-16 parts of potassium persulfate. The strong plugging drilling fluid can effectively avoid being influenced by divalent calcium ions in saline water when being applied to high-pressure saline water layer drilling, so that the stability of a well wall is maintained, and the drilling efficiency is improved.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to strong plugging drilling fluid and a preparation method thereof.
Background
Along with the continuous deepening of exploration and development, drilling in the oil drilling process encounters more and more high-pressure brine layers, the rheological property of drilling fluid is difficult to maintain in construction, complex conditions such as borehole wall instability, barite sedimentation, drill sticking and the like are easily caused, the speed of drilling operation is seriously influenced, and the safety risk of engineering is greatly increased. Divalent calcium ions in high-pressure brine have great influence on the performance of the drilling fluid, and mainly pollute polymers and clay in the system. The polymer treating agent in the drilling fluid is easy to shrink molecular chains in a high-calcium environment, is easy to degrade and lose efficacy particularly at high temperature, destroys the adsorption and gel protection functions of the polymer and greatly reduces the fluid loss reducing capacity. Meanwhile, calcium ions can be strongly adsorbed on the surface of clay particles or enter crystal layers to perform ion exchange, a double electric layer is seriously compressed, so that the surface potential is reduced, a hydration film is thinned, clay particle flocculation is caused by surface-surface and end-end coalescence of clay wafers, the adsorption between a polymer treating agent and clay is seriously influenced by the reduction of the surface potential, the processes of tackifying, trapping, physical blockage and the like of the clay wafers are also influenced, finally, the filtration loss and rheological property of drilling fluid are out of control, the drilling operation efficiency is seriously influenced, and the engineering safety risk is increased.
In the prior art, the invention patent of the patent number "CN2020105059647" discloses a salt response type intelligent polymer saturated saline drilling fluid and a preparation method thereof, and the drilling fluid has the characteristics of salt response and self-assembly by adding a supermolecule filtrate reducer, can keep rheological properties such as rapid recovery of a sheared structure, low extreme high shear rate viscosity, good shear dilution and the like in a high-salt environment, and has good filtrate reduction, reservoir protection performance, rock debris dispersion inhibition performance and good temperature resistance and pollution resistance.
The invention patent of the patent number 'CN 2013101166279' discloses a '255 ℃ ultra-high temperature resistant water-based drilling fluid and a construction process thereof', which improves the salt pollution resistance of the drilling fluid by introducing a quaternary polymer filtrate reducer and compounding sepiolite salt-resistant soil, a polymer deflocculant, a salt-resistant paste dissolving agent, an asphalt plugging anti-collapse agent, a high-temperature stabilizer and other treating agents, has the high temperature resistance of a drilling fluid system up to 255 ℃, has good salt and paste pollution resistance, and is particularly suitable for drilling construction of a paste rock stratum well section.
The invention patent of the patent number 'CN 201810513459X' discloses a 'superhigh temperature resistant and composite salt resistant zwitterionic hydrophobic association polymer fluid loss additive and a preparation method thereof', wherein a terpolymer generated by polymerization reaction of hydrophobic comonomers with temperature-sensitive characteristics, cationic monomers and anionic monomers is utilized through aqueous solution polymerization or free radical micelle emulsion polymerization reaction, and the copolymer is mainly applied to salt water and seawater drilling fluid and has a good fluid loss reducing effect under the condition of high salt.
However, in practical application, the high-pressure brine still has great influence on rheological property of the drilling fluid, so that the use effect is not ideal, and the preparation process is complex.
Therefore, how to provide a drilling fluid capable of improving the using effect of the drilling fluid and a preparation method thereof becomes a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a strong plugging drilling fluid which can effectively avoid the influence of divalent calcium ions in saline water when applied to drilling in a high-pressure saline water layer, thereby maintaining the stability of a well wall and improving the drilling efficiency.
The strong plugging drilling fluid provided by the invention comprises the following components in parts by weight:
100 parts of water, 2-8 parts of bentonite, 4-10 parts of a viscosity reducer, 1-9 parts of a calcium-resistant filtrate reducer, 10-30 parts of a plugging agent, 2-10 parts of a lubricant and 20-40 parts of a weighting agent;
the calcium-resistant fluid loss additive comprises the following components in parts by weight: 40 parts of water, 5-7 parts of maleic anhydride, 10-12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6-8 parts of acrylamide and 14-16 parts of potassium persulfate.
Preferably, the bentonite is 4-6 parts, the viscosity reducer is 6-8 parts, the calcium-resistant fluid loss additive is 4-6 parts, the plugging agent is 20-22 parts, the lubricant is 5-7 parts, and the weighting agent is 28-32 parts.
Preferably, the viscosity reducer is sulfonated lignite.
Preferably, the blocking agent is calcium carbonate with a particle size of 2000 mesh.
Preferably, the lubricant is graphite powder.
Preferably, the weighting agent is a mixture of API barite and nano barite, and the weight ratio of API barite: nano barite =1: (1-3)
The strong plugging drilling fluid provided by the invention has the following beneficial effects:
when the high-pressure brine layer drilling tool is applied to high-pressure brine layer drilling, the high-pressure brine layer drilling tool can effectively avoid being influenced by divalent calcium ions in brine, so that the stability of a well wall is maintained, and the drilling efficiency is improved.
The invention also provides a preparation method of the strong plugging drilling fluid, which comprises the following steps:
s1, preparing the calcium-resistant fluid loss additive;
s2, preparing the drilling fluid;
the step S1 includes:
s11, adding water into a three-neck flask according to the parts, then adding the parts of maleic anhydride into the three-neck flask, and stirring;
s12, adding the part of 2-acrylamide-2-methylpropanesulfonic acid into the three-neck flask and stirring;
s13, adding the acrylamide and the potassium persulfate in parts into the three-neck flask, and heating and stirring;
s14, stopping stirring, filtering out the obtained product after heat preservation, and drying and crushing the product to obtain the product;
the step S2 includes:
adding the water in the parts into an enamel measuring cup, stirring, and then sequentially adding the bentonite, the viscosity reducer, the calcium-resistant fluid loss additive, the plugging agent, the lubricant and the weighting agent in the parts into the enamel measuring cup, and stirring.
Preferably, in step S11 and step S12, the stirring speed is 200 rpm, and the stirring time is 5 minutes.
Preferably, in the step S13, the reaction temperature is 70 ℃, the stirring rate is 300 rpm, and the stirring time is 30 minutes.
Preferably, in step S14, the temperature is 70 ℃, the time is 6 hours, the drying temperature is 60 ℃, and the time is 4 hours.
Preferably, the step S13 further includes adding sodium hydroxide for adjusting the PH value, and adjusting the PH value to 9.
Preferably, in the step S2, the stirring rate is 1200 rpm.
Preferably, in the step S2, the adding time interval of each component is 3 minutes during the adding process of each component into the enamel measuring cup.
The interval sets up for each component can fully dissolve to the aquatic, can not produce the flocculation phenomenon and cause the drilling fluid performance not good.
Detailed Description
The present invention provides the following examples and comparative examples. The units of parts mentioned are in g by weight.
Example 1
S1, preparing novel calcium-resistant filtrate reducer
S11, adding 40 parts of distilled water into a three-neck flask, then adding 6 parts of maleic anhydride into the three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s12, adding 11 parts of 2-acrylamide-2-methylpropanesulfonic acid into a three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s13, adding 7 parts of acrylamide, 15 parts of potassium persulfate and 3 parts of sodium hydroxide into a three-neck flask, heating to 70 ℃, and stirring at the speed of 300 revolutions per minute for 30 minutes;
s14, stopping stirring, keeping the temperature at 70 ℃ for 6 hours, filtering the obtained product, drying at 60 ℃ for 4 hours, and crushing to obtain the product;
s2, preparing drilling fluid
100 parts of water and 5 parts of bentonite are added into an enamel measuring cup, the mixture is stirred for 3 minutes at 1200 rpm, then 7 parts of sulfonated lignite is added, the mixture is stirred for 3 minutes at 1200 rpm, then 5 parts of the novel calcium-resistant filtrate reducer prepared in the step S1 is added, the mixture is stirred for 3 minutes at 1200 rpm, then 21 parts of calcium carbonate with the particle size of 2000 meshes are added, the mixture is stirred for 3 minutes at 1200 rpm, then 6 parts of graphite is added, the mixture is stirred for 3 minutes at 1200 rpm, then 10 parts of API barite is added, and the mixture is stirred for 3 minutes at 1200 rpm, then 20 parts of nano barite is added.
Thus obtaining the strong plugging drilling fluid A1 suitable for a high-pressure brine layer.
Example 2
S1, preparing novel calcium-resistant filtrate reducer
S11, adding 40 parts of distilled water into a three-neck flask, then adding 5 parts of maleic anhydride into the three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s12, adding 10 parts of 2-acrylamide-2-methylpropanesulfonic acid into a three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s13, adding 6 parts of acrylamide, 14 parts of potassium persulfate and 3 parts of sodium hydroxide into a three-neck flask, heating to 70 ℃, and stirring at the speed of 300 revolutions per minute for 30 minutes;
s14, stopping stirring, keeping the temperature at 70 ℃ for 6 hours, filtering the obtained product, drying at 60 ℃ for 4 hours, and crushing to obtain the product;
s2, preparing drilling fluid
Adding 100 parts of water into an enamel measuring cup, then adding 4 parts of bentonite, stirring for 3 minutes at the speed of 1200 rpm, then adding 6 parts of sulfonated lignite, stirring for 3 minutes at the speed of 1200 rpm, then adding 4 parts of the novel calcium-resistant filtrate reducer prepared in the step S1, stirring for 3 minutes at the speed of 1200 rpm, then adding 20 parts of calcium carbonate with the particle size of 2000 meshes, stirring for 3 minutes at the speed of 1200 rpm, then adding 5 parts of graphite, stirring for 3 minutes at the speed of 1200 rpm, then adding 14 parts of API barite, stirring for 3 minutes at the speed of 1200 rpm, and then adding 14 parts of nano barite.
Thus obtaining the strong plugging drilling fluid A2 suitable for a high-pressure brine layer.
Example 3
S1, preparing novel calcium-resistant filtrate reducer
S11, adding 40 parts of distilled water into a three-neck flask, then adding 7 parts of maleic anhydride into the three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s12, adding 12 parts of 2-acrylamide-2-methylpropanesulfonic acid into a three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s13, adding 8 parts of acrylamide, 16 parts of potassium persulfate and 3 parts of sodium hydroxide into a three-neck flask, heating to 70 ℃, and stirring at the speed of 300 revolutions per minute for 30 minutes;
s14, stopping stirring, keeping the temperature at 70 ℃ for 6 hours, filtering the obtained product, drying at 60 ℃ for 4 hours, and crushing to obtain the product;
s2, preparing drilling fluid
Adding 100 parts of water into an enamel measuring cup, then adding 6 parts of bentonite, stirring for 3 minutes at the speed of 1200 rpm, then adding 8 parts of sulfonated lignite, stirring for 3 minutes at the speed of 1200 rpm, then adding 6 parts of the novel calcium-resistant filtrate reducer prepared in the step S1, stirring for 3 minutes at the speed of 1200 rpm, then adding 22 parts of calcium carbonate with the particle size of 2000 meshes, stirring for 3 minutes at the speed of 1200 rpm, then adding 7 parts of graphite, stirring for 3 minutes at the speed of 1200 rpm, then adding 8 parts of API barite, stirring for 3 minutes at the speed of 1200 rpm, and then adding 24 parts of nano barite.
The strong plugging drilling fluid A3 suitable for a high-pressure brine layer is prepared.
Example 4
S1, preparing novel calcium-resistant filtrate reducer
S11, adding 40 parts of distilled water into a three-neck flask, then adding 7 parts of maleic anhydride into the three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s12, adding 12 parts of 2-acrylamide-2-methylpropanesulfonic acid into a three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s13, adding 8 parts of acrylamide, 16 parts of potassium persulfate and 3 parts of sodium hydroxide into a three-neck flask, heating to 70 ℃, and stirring at the speed of 300 revolutions per minute for 30 minutes;
s14, stopping stirring, keeping the temperature at 70 ℃ for 6 hours, filtering the obtained product, drying at 60 ℃ for 4 hours, and crushing to obtain the product;
s2, preparing drilling fluid
Adding 100 parts of water into an enamel measuring cup, then adding 2 parts of bentonite, stirring for 3 minutes at the speed of 1200 rpm, then adding 4 parts of sulfonated lignite, stirring for 3 minutes at the speed of 1200 rpm, then adding 1 part of the novel calcium-resistant filtrate reducer prepared in the step S1, stirring for 3 minutes at the speed of 1200 rpm, then adding 10 parts of calcium carbonate with the particle size of 2000 meshes, stirring for 3 minutes at the speed of 1200 rpm, then adding 2 parts of graphite, stirring for 3 minutes at the speed of 1200 rpm, then adding 5 parts of API barite, stirring for 3 minutes at the speed of 1200 rpm, then adding 15 parts of nano barite.
The strong plugging drilling fluid A4 suitable for the high-pressure brine layer is prepared.
Example 5
S1, preparing novel calcium-resistant filtrate reducer
S11, adding 40 parts of distilled water into a three-neck flask, then adding 7 parts of maleic anhydride into the three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s12, adding 12 parts of 2-acrylamide-2-methylpropanesulfonic acid into a three-neck flask, and stirring at the speed of 200 revolutions per minute for 5 minutes;
s13, adding 8 parts of acrylamide, 16 parts of potassium persulfate and 3 parts of sodium hydroxide into a three-neck flask, heating to 70 ℃, and stirring at the speed of 300 revolutions per minute for 30 minutes;
s14, stopping stirring, keeping the temperature at 70 ℃ for 6 hours, filtering the obtained product, drying at 60 ℃ for 4 hours, and crushing to obtain the product;
s2, preparing drilling fluid
Adding 100 parts of water into an enamel measuring cup, then adding 8 parts of bentonite, stirring for 3 minutes at the speed of 1200 rpm, then adding 10 parts of sulfonated lignite, stirring for 3 minutes at the speed of 1200 rpm, then adding 9 parts of the novel calcium-resistant filtrate reducer prepared in the step S1, stirring for 3 minutes at the speed of 1200 rpm, then adding 30 parts of calcium carbonate with the particle size of 2000 meshes, stirring for 3 minutes at the speed of 1200 rpm, then adding 10 parts of graphite, stirring for 3 minutes at the speed of 1200 rpm, then adding 15 parts of API barite, stirring for 3 minutes at the speed of 1200 rpm, then adding 25 parts of nano barite.
The strong plugging drilling fluid A5 suitable for the high-pressure brine layer is prepared.
Comparative example 1
The remaining characteristics were the same as in example 1, except that in step S2, the novel calcium-resistant fluid loss additive was replaced with a sulfonated phenol-formaldehyde resin (a common fluid loss additive) to prepare a drilling fluid D1.
Comparative example 2
The remaining characteristics were the same as in example 1, except that in step S2, the amount of the novel calcium-resistant fluid loss additive was 0.5 part, and drilling fluid D2 was prepared.
Comparative example 3
The remaining characteristics were the same as in example 1, except that in step S2, 15 parts of the novel calcium-resistant fluid loss additive was added to prepare drilling fluid D3.
Experimental procedure and experimental data:
the drilling fluids prepared in examples 1 to 5 and comparative examples 1 to 3 were added with 20% calcium chloride solution, and then tested for rheological properties and fluid loss properties, specifically according to the standard "laboratory test for drilling fluids in the oil and gas industry" (GB/T29170 2012), the data are as follows:
the drilling fluid prepared by the invention has good rheological property and fluid loss property, the apparent viscosity is small, the fluidity is good, the dynamic shear force is also less than 15Pa, the starting pump pressure during stirring is not required to be too large, the integral rheological property is good, and the fluid loss reaches below 5ml, so that the compact mud cake can be quickly formed. The calcium-resistant filtrate reducer mainly plays a role, and because of introduction of groups such as sulfonic groups, the sensitivity of the filtrate reducer to salt is greatly reduced, namely the salt resistance of the filtrate reducer is improved, the filtrate reducer can still keep good filtrate reduction performance in a 20% calcium chloride solution environment, and the rheological property of the drilling fluid is not influenced. For D1, as the conventional sulfonated phenolic resin is used as the fluid loss additive, the fluid loss additive has good fluid loss performance under normal conditions, but once a brine layer is encountered, the performance of the fluid loss additive is greatly influenced, the fluid loss is greatly increased in an experiment, for D2, the fluid loss is still more than 10ml due to the fact that the addition amount of the novel calcium-resistant fluid loss additive is small, which indicates that the optimization is still needed, for D3, the fluid loss is small due to the fact that the addition amount of the novel calcium-resistant fluid loss additive is too large, but as the novel calcium-resistant fluid loss additive is a high polymer, the drilling fluid is thickened after the addition amount of the novel calcium-resistant fluid loss additive is too large, and the rheological performance is poor experimentally.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the invention.
Claims (13)
1. The strong plugging drilling fluid is characterized by comprising the following components in parts by weight:
100 parts of water, 2-8 parts of bentonite, 4-10 parts of a viscosity reducer, 1-9 parts of a calcium-resistant fluid loss additive, 10-30 parts of a plugging agent, 2-10 parts of a lubricant and 20-40 parts of a weighting agent;
the calcium-resistant fluid loss additive comprises the following components in parts by weight: 40 parts of water, 5-7 parts of maleic anhydride, 10-12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6-8 parts of acrylamide and 14-16 parts of potassium persulfate.
2. The strong plugging drilling fluid according to claim 1, wherein the bentonite is 4-6 parts, the viscosity reducer is 6-8 parts, the calcium-resistant fluid loss reducer is 4-6 parts, the plugging agent is 20-22 parts, the lubricant is 5-7 parts, and the weighting agent is 28-32 parts.
3. The strong plugging drilling fluid of claim 1, wherein the viscosity reducer is sulfonated lignite.
4. The strong plugging drilling fluid of claim 1, wherein the plugging agent is calcium carbonate with a particle size of 2000 mesh.
5. Strong plugging drilling fluid according to claim 1, wherein the lubricant is graphite powder.
6. The strongly plugging drilling fluid according to claim 5, wherein the weighting agent is a mixture of API barite and nano barite, and the weight ratio of API barite: nano barite =1: (1-3).
7. The preparation method for preparing the strong plugging drilling fluid of any one of claims 1-6 is characterized by comprising the following steps:
s1, preparing the calcium-resistant filtrate reducer;
s2, preparing the drilling fluid;
the step S1 includes:
s11, adding water into a three-neck flask according to the parts, then adding the parts of maleic anhydride into the three-neck flask, and stirring;
s12, adding the parts of 2-acrylamide-2-methylpropanesulfonic acid into the three-neck flask and stirring;
s13, adding the acrylamide and the potassium persulfate into the three-neck flask in parts, and heating and stirring;
s14, stopping stirring, filtering out the obtained product after heat preservation, and drying and crushing to obtain the product;
the step S2 includes:
and adding the water in parts into an enamel measuring cup, stirring, and then sequentially adding the bentonite, the viscosity reducer, the calcium-resistant filtrate reducer prepared in the step S1, the plugging agent, the lubricant and the weighting agent into the enamel measuring cup, and stirring.
8. The preparation method of the strong plugging drilling fluid according to claim 7, wherein in the step S11 and the step S12, the stirring speed is 200 rpm, and the stirring time is 5 minutes.
9. The preparation method of the strong plugging drilling fluid according to claim 7, wherein in the step S13, the reaction temperature is 70 ℃, the stirring speed is 300 rpm, and the stirring time is 30 minutes.
10. The preparation method of the strong plugging drilling fluid according to claim 7, wherein in the step S14, the temperature is maintained at 70 ℃, the time for maintaining is 6 hours, and the drying temperature is 60 ℃ and the time is 4 hours.
11. The preparation method of the strong plugging drilling fluid according to claim 7, wherein in the step S13, sodium hydroxide for adjusting the pH value is added, and the pH value is adjusted to 9.
12. The preparation method of the strong plugging drilling fluid according to claim 7, wherein in the step S2, the stirring speed is 1200 rpm.
13. The method for preparing the strong plugging drilling fluid according to claim 7, wherein in the step S2, the adding time interval of each component is 3 minutes during the adding of each component into the enamel measuring cup.
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