CN111995993A - Modified bentonite drilling fluid for drilling and preparation method thereof - Google Patents
Modified bentonite drilling fluid for drilling and preparation method thereof Download PDFInfo
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- CN111995993A CN111995993A CN202010920458.4A CN202010920458A CN111995993A CN 111995993 A CN111995993 A CN 111995993A CN 202010920458 A CN202010920458 A CN 202010920458A CN 111995993 A CN111995993 A CN 111995993A
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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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
- C09K2208/34—Lubricant additives
Abstract
The invention relates to a modified bentonite drilling fluid for drilling and a preparation method thereof, wherein raw materials containing bentonite and photo-modified powder are subjected to multiple freeze-thaw circulating stirring, the internal molecular bonding strength of the raw materials is further reduced due to dehydration at low temperature, the photo-modified powder and the bentonite raw materials are more fully mixed after the dehydration, nanoscale contact is achieved, and the adjusting effect can be improved during adjustment such as tackifying and the like; then, the surface charge property of the raw material can be adjusted by further modifying in a sunlight exposure or ultraviolet light irradiation mode, so that the slurry is quickly formed after a tackifier, a flow pattern regulator, a pH regulator and the like comprising surfactants are added, the slurry forming rate is high, the sand wrapping capacity is high, the filtration loss is low, and the stability is better; the preparation method of the used light modified powder is a laser ablation method, no other raw materials are introduced in the preparation process, the light modified powder can directly ablate metal or oxide thereof to obtain a product, the yield is high, the light modified powder is safe and pollution-free, the modification of bentonite is not influenced, and the light modified powder is also suitable for other industrial applications.
Description
Technical Field
The invention relates to the field of bentonite, in particular to modified bentonite drilling fluid for drilling and a preparation method thereof.
Background
The bentonite is a non-metal mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2: the crystal structure of the type 1 has better ion exchange performance because certain cations, such as Cu, Mg, Na, K and the like, exist in a layered structure formed by montmorillonite unit cells, and the cations have unstable effects with the montmorillonite unit cells and are easy to exchange with other cations. The modified polyurethane has a specific layered structure, so that the modified polyurethane has a large specific surface area, so that the modified polyurethane has strong adsorbability, and simultaneously has excellent dispersibility, suspensibility and cohesiveness in an aqueous solution due to the existence of a hydrophilic group OH, and shows excellent thixotropy within a certain concentration range. Namely, when external stirring is carried out, the suspension is represented as sol solution with good fluidity, and the sol solution can be automatically arranged into gel with a three-dimensional net structure after the stirring is stopped, so that the sedimentation and the water separation are not generated. This property is particularly suitable for formulating drilling muds. The commonly used bentonite modification methods include sodium modification, acid modification, roasting modification, salt modification, organic modification, inorganic pillared modification, inorganic/organic composite modification and the like.
Patent CN103482638A discloses a method for manufacturing organobentonite, comprising the following steps: 1) pulping; 2) precipitating slurry; 3) removing sand by the cyclone sand remover; 4) further filtering solid impurities by using a horizontal centrifuge; 5) performing liquid-liquid separation by a disc centrifuge to obtain concentrated sodium-based montmorillonite slurry; 6) measuring the solid content; 7) adding soda ash; 8) heating, adding sulfuric acid to adjust the pH value, and keeping the temperature; 9) organic covering reaction: adding white oil and octadecyl trimethyl ammonium chloride; 10) pressing to dry; 11) and (5) drying.
Patent CN107777696A discloses a preparation method of organic bentonite, grinding calcium bentonite to fineness of 100-325 meshes by a Raymond machine, adding water for pulping, adding sodium carbonate for uniform mixing, and aging to obtain sodium bentonite slurry; adding the sodium bentonite slurry and polyacrylamide into a reaction kettle, reacting, performing filter pressing, then transferring into a modifying machine, adding dibutyl phthalate and an emulsifier into the modifying machine, modifying, drying, adding into a mixing roll, and mixing with dimethyl octadecyl benzyl ammonium chloride to obtain the organic bentonite.
When the drilling fluid is used after preparation, on one hand, excessive reagents are added in modification, and even some drilling fluids are toxic or high in danger; some modification processes are too complicated. Moreover, in actual use, due to poor fusion of bentonite itself with other reagents, it is inevitable that sedimentation and water segregation may occur even after a long period of still time in actual use.
Laser irradiation and ablation processing are high-efficiency modification methods proposed in recent years, and the method is safe and non-toxic on one hand, good in controllability and high in laser energy on the other hand, can reach nanometer level for processing materials, and is widely applied to preparation of various colloids. In addition, zinc oxide and titanium oxide are high-efficiency light modification materials, and particularly, the nano-scale zinc oxide and titanium oxide have high specific surface area and can directly cause electron transfer after absorbing light so as to adjust the charge characteristics of the nano-scale zinc oxide and titanium oxide.
Disclosure of Invention
In view of the above, in order to solve the problems of the prior art, the present application provides a modified bentonite drilling fluid for drilling, comprising the following components: bentonite, a tackifier, a filtrate reducer, a flow pattern regulator, a plugging agent, a weighting agent, light modification powder, a pH regulator, a lubricant and water;
the tackifier is one or more of xanthan gum, amine oxide and polyvinylpyrrolidone; the fluid loss additive is one or more of sulfomethyl phenolic resin and lignite resin; the flow pattern regulator is polyamide LH-OWA or polyamide LH-ORM; the weighting agent is barite; the optical modified powder is nano ZnO or nano TiO 2; the pH regulator is a mixture of sulfuric acid, polyvinyl alcohol, sodium silicate and sodium carbonate; the lubricant is graphite powder or silicon dioxide nano microspheres;
wherein the bentonite comprises, by weight, 5-8 parts of bentonite, 2-3 parts of tackifier, 2-3 parts of filtrate reducer, 3-5 parts of flow pattern regulator, 2-5 parts of plugging agent, 40-50 parts of weighting agent, 10-15 parts of light modifying powder, 5-8 parts of pH regulator, 1-2 parts of lubricant and 100 parts of water.
On the other hand, the preparation method of the modified bentonite drilling fluid for drilling comprises the following steps:
step 1, mixing and stirring raw materials
Mixing bentonite, a filtrate reducer, a plugging agent, a lubricant, a weighting agent and light modification powder, stirring and mixing for more than 1 hour by using a high-speed mixer after mixing, then adding water with equal weight into the mixture for mixing, and stirring for more than 1 hour after mixing;
step 2, freezing and forming
Freezing the mixture obtained in the step 1 at-20 ℃ for 10 hours; the frozen product is thawed in an open air mode at room temperature, and stirring and crushing are carried out after the product is thawed;
step 3, light irradiation modification
Carrying out multiple freeze-thaw cycles on the product obtained in the step 2 until the water content is lower than 30%; then spreading the mixture into a thickness of less than 5cm, placing the mixture in the sun, keeping the water content of 30-35% exposed for more than 100 hours, turning the mixture once every 10 hours, and requiring the average power density of the sun to be more than 30W/m 2; or ultraviolet laser irradiation for more than 50 hours is used for replacing the sunshine insolation, and the stirring is carried out once every 5 hours; the laser power density is required to be more than 50W/m2 when the laser is irradiated, the laser wavelength is less than 300nm, and water is added for supplement when the water content is insufficient in the modification process;
and 4, adding the modified product obtained in the step 3 into a tackifier, a flow pattern regulator, a pH regulator and water for fully mixing to obtain the modified bentonite drilling fluid.
Wherein the light modification powder is nano ZnO or nano TiO2, and the particle size is less than 200 nm.
The preparation method of the light modified powder comprises the following steps:
step A, adding 10 times of volume of water into industrial zinc oxide or titanium dioxide powder to mix, wherein the purity of zinc oxide and titanium dioxide raw materials is higher than 98%;
b, placing the product mixed in the step A in a stirrer, stirring at a high speed, and then placing the product in an infrared pulse laser for ablation preparation, wherein the single pulse energy of the laser is required to be more than 100J/cm2, the laser repetition frequency is more than 500Hz, the ablation time is more than 10 hours, and the product is processed until the particle size is less than 200 nm;
and C, drying the product in the step B.
Or the preparation method of the light modified powder comprises the following steps:
step A, adding 15 times of volume of water into industrial zinc powder or titanium powder to mix, wherein the purity of the zinc powder and the titanium powder is higher than 95%;
b, placing the product mixed in the step A in a stirrer, stirring at a high speed, and then placing the product in an infrared pulse laser for ablation preparation, wherein the single pulse energy of the laser is required to be more than 100J/cm2, the laser repetition frequency is more than 500Hz, the ablation time is more than 10 hours, and the product is processed until the particle size is less than 200 nm; maintaining the water temperature below 30 deg.C during ablation;
and C, drying the product in the step B.
Wherein, the infrared laser is a carbon dioxide laser.
The invention has the beneficial effects that: when the drilling fluid is prepared, the raw materials containing bentonite and light modified powder are subjected to freeze-thaw cycle stirring for multiple times, the molecular connection strength in the raw materials is further reduced due to dehydration at low temperature, the light modified powder and the bentonite raw materials are more fully mixed after the molecular connection strength is reduced, nanoscale contact is achieved, and the adjusting effect can be improved during adjustment such as tackifying and the like; then, the surface charge property of the raw material can be adjusted by further modifying in a sunlight exposure or ultraviolet light irradiation mode, so that the slurry is quickly formed after a tackifier, a flow pattern regulator, a pH regulator and the like comprising surfactants are added, the slurry forming rate is high, the sand wrapping capacity is high, the filtration loss is low, and the stability is better;
the preparation method of the used light modified powder is a laser ablation method, no other raw materials are introduced in the preparation process, the light modified powder can directly ablate metal or oxide thereof to obtain a product, the yield is high, the light modified powder is safe and pollution-free, the modification of bentonite is not influenced, and the light modified powder is also suitable for other industrial applications.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosed subject matter, are incorporated in and constitute a part of this specification. The drawings illustrate the implementations of the disclosed subject matter and, together with the detailed description, serve to explain the principles of implementations of the disclosed subject matter. No attempt is made to show structural details of the disclosed subject matter in more detail than is necessary for a fundamental understanding of the disclosed subject matter and various modes of practicing the same.
FIG. 1 is a flow diagram of a modification of the present invention;
FIG. 2 is a flow chart of the light modifying powder processing of the present invention
FIG. 3 is another process flow diagram of the light-modifying powder of the present invention.
Detailed Description
The advantages, features and methods of accomplishing the same will become apparent from the drawings and the detailed description that follows.
Example 1:
with reference to fig. 1, the present application provides a modified bentonite drilling fluid for drilling, comprising the following components: bentonite, a tackifier, a filtrate reducer, a flow pattern regulator, a plugging agent, a weighting agent, light modification powder, a pH regulator, a lubricant and water;
the tackifier is one or more of xanthan gum, amine oxide and polyvinylpyrrolidone; the fluid loss additive is one or more of sulfomethyl phenolic resin and lignite resin; the flow pattern regulator is polyamide LH-OWA or polyamide LH-ORM; the weighting agent is barite; the optical modified powder is nano ZnO or nano TiO 2; the pH regulator is a mixture of sulfuric acid, polyvinyl alcohol, sodium silicate and sodium carbonate; the lubricant is graphite powder or silicon dioxide nano microspheres;
wherein the bentonite comprises, by weight, 5-8 parts of bentonite, 2-3 parts of tackifier, 2-3 parts of filtrate reducer, 3-5 parts of flow pattern regulator, 2-5 parts of plugging agent, 40-50 parts of weighting agent, 10-15 parts of light modifying powder, 5-8 parts of pH regulator, 1-2 parts of lubricant and 100 parts of water.
On the other hand, the preparation method of the modified bentonite drilling fluid for drilling comprises the following steps:
step 1, mixing and stirring raw materials
Mixing bentonite, a filtrate reducer, a plugging agent, a lubricant, a weighting agent and light modification powder, stirring and mixing for more than 1 hour by using a high-speed mixer after mixing, then adding water with equal weight into the mixture for mixing, and stirring for more than 1 hour after mixing;
step 2, freezing and forming
Freezing the mixture obtained in the step 1 at-20 ℃ for 10 hours; the frozen product is thawed in an open air mode at room temperature, and stirring and crushing are carried out after the product is thawed;
step 3, light irradiation modification
Carrying out multiple freeze-thaw cycles on the product obtained in the step 2 until the water content is lower than 30%; then spreading the mixture into a thickness of less than 5cm, placing the mixture in the sun, keeping the water content of 30-35% exposed for more than 100 hours, turning the mixture once every 10 hours, and requiring the average power density of the sun to be more than 30W/m 2; or ultraviolet laser irradiation for more than 50 hours is used for replacing the sunshine insolation, and the stirring is carried out once every 5 hours; the laser power density is required to be more than 50W/m2 when the laser is irradiated, the laser wavelength is less than 300nm, and water is added for supplement when the water content is insufficient in the modification process;
and 4, adding the modified product obtained in the step 3 into a tackifier, a flow pattern regulator, a pH regulator and water for fully mixing to obtain the modified bentonite drilling fluid.
Wherein the light modification powder is nano ZnO or nano TiO2, and the particle size is less than 200 nm.
Wherein the number of freeze-thaw cycles is at least 5, and if the moisture content during the freeze-thaw cycles is less than 30%, replenishing water to a moisture content of 30%.
Example 2:
referring to fig. 3, the preparation method of the light modifying powder is as follows:
step A, adding 10 times of volume of water into industrial zinc oxide or titanium dioxide powder to mix, wherein the purity of zinc oxide and titanium dioxide raw materials is higher than 98%;
b, placing the product mixed in the step A in a stirrer, stirring at a high speed, and then placing the product in an infrared pulse laser for ablation preparation, wherein the single pulse energy of the laser is required to be more than 100J/cm2, the laser repetition frequency is more than 500Hz, the ablation time is more than 10 hours, and the product is processed until the particle size is less than 200 nm;
and C, drying the product in the step B.
Example 3:
referring to fig. 2, the preparation method of the light modifying powder is as follows:
step A, adding 15 times of volume of water into industrial zinc powder or titanium powder to mix, wherein the purity of the zinc powder and the titanium powder is higher than 95%;
b, placing the product mixed in the step A in a stirrer, stirring at a high speed, and then placing the product in an infrared pulse laser for ablation preparation, wherein the single pulse energy of the laser is required to be more than 100J/cm2, the laser repetition frequency is more than 500Hz, the ablation time is more than 10 hours, and the product is processed until the particle size is less than 200 nm; maintaining the water temperature below 30 deg.C during ablation;
and C, drying the product in the step B.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. The modified bentonite drilling fluid for drilling is characterized by comprising the following components: bentonite, a tackifier, a filtrate reducer, a flow pattern regulator, a plugging agent, a weighting agent, light modification powder, a pH regulator, a lubricant and water;
the tackifier is one or more of xanthan gum, amine oxide and polyvinylpyrrolidone; the fluid loss additive is one or more of sulfomethyl phenolic resin and lignite resin; the flow pattern regulator is polyamide LH-OWA or polyamide LH-ORM; the weighting agent is barite; the optical modified powder is nano ZnO or nano TiO2(ii) a The pH regulator is a mixture of sulfuric acid, polyvinyl alcohol, sodium silicate and sodium carbonate; the lubricant is graphite powderOr silica nanospheres.
2. The modified bentonite drilling fluid for drilling according to claim 1, characterized in that:
the bentonite comprises, by weight, 5-8 parts of bentonite, 2-3 parts of a tackifier, 2-3 parts of a fluid loss agent, 3-5 parts of a flow pattern regulator, 2-5 parts of a plugging agent, 40-50 parts of a weighting agent, 10-15 parts of light modifying powder, 5-8 parts of a pH regulator, 1-2 parts of a lubricant and 100 parts of water.
3. A method of preparing a modified bentonite drilling fluid for drilling according to claim 1 or 2, characterized by comprising the steps of:
step 1, mixing and stirring raw materials
Mixing bentonite, a filtrate reducer, a plugging agent, a lubricant, a weighting agent and light modification powder, stirring and mixing for more than 1 hour by using a high-speed mixer after mixing, then adding water with equal weight into the mixture for mixing, and stirring for more than 1 hour after mixing;
step 2, freezing and forming
Freezing the mixture obtained in the step 1 at-20 ℃ for 10 hours; the frozen product is thawed in an open air mode at room temperature, and stirring and crushing are carried out after the product is thawed;
step 3, light irradiation modification
Carrying out multiple freeze-thaw cycles on the product obtained in the step 2 until the water content is lower than 30%; then spreading the mixture into a thickness of less than 5cm, placing the mixture in the sun, keeping the water content of 30-35% and exposing the mixture for more than 100 hours, turning the mixture once every 10 hours, and requiring the average power density of the sun to be more than 30W/m2(ii) a Or ultraviolet laser irradiation for more than 50 hours is used for replacing the sunshine insolation, and the stirring is carried out once every 5 hours; the laser power density is required to be more than 50W/m during laser irradiation2The laser wavelength is less than 300nm, and water is added for supplement when the water content is insufficient in the modification process;
and 4, adding the modified product obtained in the step 3 into a tackifier, a flow pattern regulator, a pH regulator and water for fully mixing to obtain the modified bentonite drilling fluid.
4. The method for preparing a modified bentonite drilling fluid for well drilling according to claim 3, wherein the modified bentonite drilling fluid comprises the following components:
the optical modified powder is nano ZnO or nano TiO2The particle size is less than 200 nm.
5. The method for preparing the modified bentonite drilling fluid for well drilling according to claim 4, wherein the modified bentonite drilling fluid comprises the following components:
the preparation method of the light modified powder comprises the following steps:
step A, adding 10 times of volume of water into industrial zinc oxide or titanium dioxide powder to mix, wherein the purity of zinc oxide and titanium dioxide raw materials is higher than 98%;
step B, placing the product mixed in the step A in a stirrer to stir at a high speed, and then placing the product in an infrared pulse laser to perform ablation preparation, wherein the laser single pulse energy is required to be more than 100J/cm2Laser repetition frequency is more than 500Hz, ablation time is more than 10 hours, and processing is carried out until the grain diameter is less than 200 nm;
and C, drying the product in the step B.
6. The method for preparing the modified bentonite drilling fluid for well drilling according to claim 4, wherein the modified bentonite drilling fluid comprises the following components:
the preparation method of the light modified powder comprises the following steps:
step A, adding 15 times of volume of water into industrial zinc powder or titanium powder to mix, wherein the purity of the zinc powder and the titanium powder is higher than 95%;
step B, placing the product mixed in the step A in a stirrer to stir at a high speed, and then placing the product in an infrared pulse laser to perform ablation preparation, wherein the laser single pulse energy is required to be more than 100J/cm2Laser repetition frequency is more than 500Hz, ablation time is more than 10 hours, and processing is carried out until the grain diameter is less than 200 nm; maintaining the water temperature below 30 deg.C during ablation;
and C, drying the product in the step B.
7. The method for preparing a modified bentonite drilling fluid for drilling according to claim 5 or 6, wherein:
the infrared laser is a carbon dioxide laser.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113136181A (en) * | 2021-04-07 | 2021-07-20 | 中国石油天然气股份有限公司 | Biosynthesis-based drilling fluid and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165244A (en) * | 2018-02-07 | 2018-06-15 | 西南石油大学 | A kind of drilling fluid for inhibiting surface of clay aquation and preparation method thereof |
| CN108384524A (en) * | 2018-02-07 | 2018-08-10 | 西南石油大学 | A kind of drilling fluid and preparation method thereof suitable for shale gas well |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165244A (en) * | 2018-02-07 | 2018-06-15 | 西南石油大学 | A kind of drilling fluid for inhibiting surface of clay aquation and preparation method thereof |
| CN108384524A (en) * | 2018-02-07 | 2018-08-10 | 西南石油大学 | A kind of drilling fluid and preparation method thereof suitable for shale gas well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113136181A (en) * | 2021-04-07 | 2021-07-20 | 中国石油天然气股份有限公司 | Biosynthesis-based drilling fluid and preparation method thereof |
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