CN112226216B - High-efficiency petroleum drilling fluid and preparation method thereof - Google Patents
High-efficiency petroleum drilling fluid and preparation method thereof Download PDFInfo
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- CN112226216B CN112226216B CN202011324321.9A CN202011324321A CN112226216B CN 112226216 B CN112226216 B CN 112226216B CN 202011324321 A CN202011324321 A CN 202011324321A CN 112226216 B CN112226216 B CN 112226216B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
Abstract
The scheme relates to a high-efficiency petroleum drilling fluid and a preparation method thereof, and the high-efficiency petroleum drilling fluid comprises the following components: water, bentonite, potassium chloride, a modified cellulose filtrate reducer, a plugging material and a weighting agent; the modified cellulose filtrate reducer is prepared by taking cellulose as a core and quaternary ammonium salt as a shell; the plugging material is a carbon nano tube-polyacrylonitrile composite nano fiber plugging material. The high-efficiency drilling fluid provided by the invention has reasonable component proportion, and the modified cellulose filtrate reducer has unique core-shell structure and contains abundant functional groups such as carboxyl, sulfonic group and the like in a polymer chain, so that the high-temperature-resistant and salt-resistant effects are good, and the filtration loss of the drilling fluid is effectively reduced; the nanofiber material effectively solves the problem of leakage of tiny pores, and simultaneously styrene and acrylonitrile are polymerized to provide rigid groups, so that the bearing capacity is improved, and the plugging operation of cracks of different degrees can be performed; the drilling fluid has excellent performances in rheological property, stability, plugging property, inhibitive property and the like under the condition of coal-containing stratum.
Description
Technical Field
The invention relates to the technical field of petroleum drilling fluid, in particular to high-efficiency petroleum drilling fluid and a preparation method thereof.
Background
Petroleum is a fluid mineral buried deep underground and is an important energy source and chemical principle. However, petroleum resources are limited, and thus, it is very important to improve the recovery yield of petroleum. In the process of oil exploitation, drilling fluid is generally used, and the drilling fluid mainly has the functions of carrying rock debris at the bottom of a well to the ground, keeping the bottom of the well clean, forming a filter cake on the well wall and preventing pollution to an oil-gas layer and collapse of the well wall.
The drilling fluid is divided into two categories, namely water-based drilling fluid and oil-based drilling fluid, wherein the water-based drilling fluid is most widely used due to the advantages of environmental protection, low cost and the like. However, the water-based drilling fluid also has the defects of poor thermal stability, insufficient lubrication anti-sticking capability, poor pollution resistance, complicated maintenance and treatment work and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the water-based drilling fluid which is safe and efficient and has stronger filtration loss reduction and anti-blocking performance.
In order to achieve the purpose, the invention provides the following technical scheme:
an efficient petroleum drilling fluid comprises the following components: water, bentonite, potassium chloride, a modified cellulose filtrate reducer, a plugging material and a weighting agent; the modified cellulose filtrate reducer is prepared by taking xanthate and carboxymethyl cellulose as starting materials to prepare a macromolecular RAFT reagent, carrying out emulsion polymerization on the macromolecular RAFT reagent, 2-acrylamido dodecyl sulfonic acid, acrylamide and hydroxyethyl acrylate, and then adding N, N-dimethyl epoxypropyl dodecyl ammonium chloride into an emulsion polymerization system.
Further, the preparation steps of the modified cellulose filtrate reducer are as follows:
1) adding potassium ethyl xanthate and acetone into a reaction bottle, stirring to dissolve the potassium ethyl xanthate and the acetone, dropwise adding 2-bromopropionic acid with the same mole into the reaction bottle, stirring at room temperature to react for 2 hours, extracting with ethyl acetate to separate an organic phase, removing the ethyl acetate by rotary evaporation, and drying to obtain xanthate;
2) adding the xanthate into a reaction bottle, adding trichloromethane to dissolve the xanthate, slowly dropwise adding a trichloromethane solution of N, N-dicyclohexylcarbodiimide and 4-dimethylaminopyridine into the reaction bottle to obtain a mixed solution, slowly dropwise adding the mixed solution into a trichloromethane solution of carboxymethyl cellulose, stirring the mixed solution at room temperature for reaction for 48 hours, placing the reaction solution into cold absolute ethyl alcohol for crystallization after the reaction is finished, filtering out solids, and performing vacuum drying to obtain a macromolecular RAFT reagent;
3) sequentially adding an initiator, an emulsifier, 2-acrylamido dodecyl sulfonic acid, acrylamide and hydroxyethyl acrylate into water according to a certain proportion, uniformly stirring to obtain a mixed solution, introducing nitrogen, heating to 60-70 ℃ under the nitrogen atmosphere, adding the macromolecular RAFT reagent, stirring and reacting for 2-3h under the protection of nitrogen, and then cooling to room temperature to obtain a polymer emulsion;
4) dissolving N, N-dimethyl epoxy propyl dodecyl ammonium chloride in water, then dropwise adding the solution into the polymer emulsion, adjusting the pH of the emulsion system to 8-9 by using hydrochloric acid and sodium hydroxide solution, and heating to 80 ℃ for reaction for 8 hours;
5) and after the reaction is finished, cooling to room temperature, dialyzing, and freeze-drying to obtain the modified cellulose filtrate reducer.
Further, the mass ratio of the carboxymethyl cellulose to the xanthate to the N, N-dicyclohexylcarbodiimide to the 4-dimethylaminopyridine is 1: 1-5: 0.1-0.5.
Further, the molar ratio of the macro-molecule RAFT reagent to the 2-acrylamido dodecyl sulfonic acid, the acrylamide, the hydroxyethyl acrylate, the initiator and the emulsifier is 1: 50-100: 50-80: 60-100: 0.1-0.5; the molar ratio of the N, N-dimethyl epoxy propyl dodecyl ammonium chloride to the hydroxyethyl acrylate is 1: 1.
Further, the water, the bentonite, the potassium chloride, the modified cellulose filtrate reducer, the plugging material and the weighting agent are respectively 100 parts by weight of water, 3-5 parts by weight of bentonite, 5-8 parts by weight of potassium chloride, 1-2 parts by weight of the modified cellulose filtrate reducer, 1-2 parts by weight of the plugging material and 50-80 parts by weight of the weighting agent.
Further, the plugging material is a carbon nanotube-polyacrylonitrile composite nanofiber plugging material.
Further, the carbon nanotube-polyacrylonitrile composite nanofiber plugging material is prepared by carrying out free radical polymerization on acrylonitrile and styrene to obtain a polyacrylonitrile-styrene copolymer, then dissolving the polyacrylonitrile-styrene copolymer in N, N-dimethylformamide, adding the multiwalled carbon nanotube and calcium carbonate, and then carrying out electrostatic spinning.
Furthermore, the mass ratio of the acrylonitrile to the styrene is 1: 0.5-1, and the mass ratio of the polyacrylonitrile-styrene copolymer, the multi-wall carbon nano tube and the calcium carbonate is 1: 0.01-0.1: 0.5-1.
Further, the weighting agent is one or more of barite, calcium carbonate powder, iron ore powder and hematite powder.
Further, the initiator is a persulfate; the emulsifier is sodium dodecyl sulfate.
The invention further discloses a method for preparing the high-efficiency petroleum drilling fluid, which comprises the following steps: uniformly stirring and mixing water and bentonite at the stirring speed of 2500-3500r/min, and sealing and standing for 24 h; then adding potassium chloride, modified cellulose filtrate reducer, plugging material and weighting agent, and uniformly stirring at the stirring speed of 7000-9000r/min to prepare the high-efficiency petroleum drilling fluid.
Compared with the prior art, the invention has the beneficial effects that: the high-efficiency water-based drilling fluid provided by the invention has the advantages that the components are reasonable in proportion and have a synergistic effect, and the use effect of the drilling fluid is good; the modified cellulose filtrate reducer has a unique core-shell structure, and a polymer chain contains rich functional groups such as carboxyl, sulfonic acid and the like, so that the modified cellulose filtrate reducer has good high-temperature resistance and salt resistance effects, and the filtrate loss of the drilling fluid is effectively reduced; the nanofiber membrane prepared from the carbon nanotube and the acrylonitrile is used as a plugging agent, so that the problem of leakage of tiny pores is effectively solved by the nanofiber material, and meanwhile, styrene and the acrylonitrile are polymerized to provide rigid groups, so that the bearing capacity is improved, and the plugging operation of cracks in different degrees can be performed; the water-based drilling fluid disclosed by the invention has good performances in the aspects of rheological property, stability, plugging property, inhibitive property and the like under the condition of a coal-containing stratum.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example (b): an efficient petroleum drilling fluid comprises the following components: water, bentonite, potassium chloride, modified cellulose filtrate reducer, plugging material and weighting agent.
The preparation process of the modified cellulose filtrate reducer comprises the following steps:
1) adding 8g of potassium ethyl xanthate and acetone into a reaction bottle, stirring to dissolve the potassium ethyl xanthate and the acetone, dropwise adding 7.7g of 2-bromopropionic acid into the reaction bottle, stirring at room temperature to react for 2 hours, extracting with ethyl acetate to separate an organic phase, removing the ethyl acetate by rotary evaporation, and drying to obtain 8.81g of xanthate;
2) adding 0.2mol of xanthate into a reaction bottle, adding 10ml of trichloromethane to make the solvent, respectively and slowly dropwise adding 0.2mol of N, N-Dicyclohexylcarbodiimide (DCC) and 0.02mol of trichloromethane solution of 4-Dimethylaminopyridine (DMAP) to obtain a mixed solution, slowly dropwise adding the mixed solution into 0.2mol of trichloromethane solution of carboxymethyl cellulose, stirring and reacting for 48 hours at room temperature, placing the reaction solution into cold absolute ethanol for crystallization after the reaction is finished, filtering out a solid, and performing vacuum drying to obtain a macromolecular RAFT reagent;
3) sequentially adding 0.005mol of sodium persulfate, 0.005mol of sodium dodecyl sulfate, 2.5mol of 2-acrylamido dodecyl sulfonic acid, 2.5mol of acrylamide and 3mol of hydroxyethyl acrylate into water, uniformly stirring to obtain a mixed solution, introducing nitrogen, heating to 60-70 ℃ under the nitrogen atmosphere, adding 0.05mol of macromolecular RAFT reagent, stirring for reacting for 2-3h under the protection of nitrogen, and then cooling to room temperature to obtain a polymer emulsion;
4) dissolving 3mol of N, N-dimethyl epoxy propyl dodecyl ammonium chloride in water, then dropwise adding the solution into the polymer emulsion, adjusting the pH value of the emulsion system to 8-9, and heating to 80 ℃ for reaction for 8 hours;
5) and after the reaction is finished, cooling to room temperature, dialyzing, and freeze-drying to obtain the modified cellulose filtrate reducer with the core-shell structure.
The preparation process of the plugging material comprises the following steps:
adding acrylonitrile, styrene and benzoyl peroxide into a N, N-Dimethylformamide (DMF) solvent, heating to 80 ℃, stirring for reacting for 2-3h, adding a multi-walled carbon nano tube and calcium carbonate after the reaction is finished, and performing electrostatic spinning to obtain the nano-composite material.
Further, the method for preparing the high-efficiency petroleum drilling fluid comprises the following steps: uniformly stirring and mixing water and bentonite at the stirring speed of 2500-3500r/min, and sealing and standing for 24 h; then adding potassium chloride, modified cellulose fluid loss additive, plugging material and weighting agent, and uniformly stirring at the stirring speed of 7000-9000r/min to prepare the high-efficiency petroleum drilling fluid.
Example 1: 100 parts of water, 3 parts of bentonite, 5 parts of potassium chloride, 1 part of modified cellulose filtrate reducer, 1 part of plugging material and 50 parts of calcium carbonate powder.
The preparation process of the plugging material comprises the following steps: adding 10mmol of acrylonitrile, 10mmol of styrene and 0.1mmol of benzoyl peroxide into 10ml of N, N-Dimethylformamide (DMF) solvent, heating to 80 ℃, stirring for reaction for 2-3h, adding 0.15g of multi-walled carbon nano-tube and 7g of calcium carbonate after the reaction is finished, and then carrying out electrostatic spinning to obtain the nano-composite material.
Example 2: 100 parts of water, 5 parts of bentonite, 5 parts of potassium chloride, 2 parts of modified cellulose filtrate reducer, 2 parts of plugging material, 20 parts of iron ore powder and 50 parts of calcium carbonate powder.
The preparation process of the plugging material comprises the following steps: adding 10mmol of acrylonitrile, 10mmol of styrene and 0.1mmol of benzoyl peroxide into 10ml of DMF solvent, heating to 80 ℃, stirring for reaction for 2-3h, adding 0.15g of multi-walled carbon nano-tube and 7g of calcium carbonate after the reaction is finished, and then carrying out electrostatic spinning to obtain the nano-composite material.
Example 3: 100 parts of water, 5 parts of bentonite, 5 parts of potassium chloride, 2 parts of modified cellulose filtrate reducer, 2 parts of plugging material, 30 parts of barite and 40 parts of calcium carbonate powder.
The preparation process of the plugging material comprises the following steps: adding 10mmol of acrylonitrile, 10mmol of styrene and 0.1mmol of benzoyl peroxide into 10ml of DMF solvent, heating to 80 ℃, stirring for reacting for 2-3h, adding 0.3g of multi-walled carbon nano-tube and 10g of calcium carbonate after the reaction is finished, and then carrying out electrostatic spinning to obtain the nano-composite material.
Comparative example 1: the difference from example 3 is that the modified cellulose fluid loss additive was changed to a plain cellulose fluid loss additive.
Comparative example 2: the difference from example 3 is that the plugging material was replaced by a commercially available plugging agent.
The drilling fluids prepared in examples 1-3 and comparative examples 1-2 were aged in a roller oven type XGRL-2 at 120 ℃ for 16 hours, and the basic properties were measured according to GB/T16783.1-2014, and the results are recorded in Table 1.
TABLE 1
| AV/mPa . s | PV/mPa . s | YP/Pa | Gel(Pa/Pa) | FL/ml | |
| Example 1 | 44 | 23 | 17 | 1.5/5.5 | 9.2 |
| Example 2 | 39 | 22 | 15.5 | 1.0/5.0 | 8.8 |
| Example 3 | 30 | 18 | 14 | 0.5/2.5 | 8.1 |
| Comparative example 1 | 62 | 26 | 21 | 4.5/11.5 | 18.9 |
| Comparative example 2 | 56 | 30 | 23.5 | 6.0/15.5 | 16.2 |
As can be seen from the data in Table 1, the apparent viscosity AV, the plastic viscosity PV, the dynamic shear (stress) force YP and the static shear force Gel of the high-efficiency drilling fluids prepared in examples 1 to 3 are all superior to those of comparative examples 1 to 2, and are particularly obvious in the aspect of improving the fluid loss performance, so that the drilling fluids prepared by the method have good rheological property, stability and fluid loss property, and can meet the safe drilling requirement under the condition of a coal-containing stratum.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (7)
1. The efficient oil drilling fluid is characterized by comprising the following components in parts by weight: 100 parts of water, 3-5 parts of bentonite, 5-8 parts of potassium chloride, 1-2 parts of modified cellulose filtrate reducer, 1-2 parts of plugging material and 50-80 parts of weighting agent; the modified cellulose filtrate reducer is a core-shell structure modified cellulose filtrate reducer prepared by taking xanthate and carboxymethyl cellulose as starting materials to prepare a macromolecular RAFT reagent, carrying out emulsion polymerization on the macromolecular RAFT reagent, 2-acrylamido dodecyl sulfonic acid, acrylamide and hydroxyethyl acrylate, and then adding N, N-dimethyl epoxypropyl dodecyl ammonium chloride into an emulsion polymerization system; the plugging material is a carbon nano tube-polyacrylonitrile composite nanofiber plugging material, and is prepared by carrying out free radical polymerization on acrylonitrile and styrene to obtain a polyacrylonitrile-styrene copolymer, dissolving the polyacrylonitrile-styrene copolymer in N, N-dimethylformamide, adding a multi-wall carbon nano tube and calcium carbonate, and then carrying out electrostatic spinning.
2. The high efficiency oil drilling fluid according to claim 1, wherein the modified cellulose fluid loss additive is prepared by the following steps:
1) adding potassium ethyl xanthate and acetone into a reaction bottle, stirring to dissolve the potassium ethyl xanthate and the acetone, dropwise adding 2-bromopropionic acid with the same mole into the reaction bottle, stirring at room temperature to react for 2 hours, extracting with ethyl acetate to separate an organic phase, removing the ethyl acetate by rotary evaporation, and drying to obtain xanthate;
2) adding the xanthate into a reaction bottle, adding trichloromethane to dissolve the xanthate, slowly dropwise adding a trichloromethane solution of N, N-dicyclohexylcarbodiimide and 4-dimethylaminopyridine into the reaction bottle to obtain a mixed solution, slowly dropwise adding the mixed solution into a trichloromethane solution of carboxymethyl cellulose, stirring the mixed solution at room temperature for reaction for 48 hours, placing the reaction solution into cold absolute ethyl alcohol for crystallization after the reaction is finished, filtering out solids, and performing vacuum drying to obtain a macromolecular RAFT reagent;
3) sequentially adding an initiator, an emulsifier, 2-acrylamido dodecyl sulfonic acid, acrylamide and hydroxyethyl acrylate into water according to a certain proportion, uniformly stirring to obtain a mixed solution, introducing nitrogen, heating to 60-70 ℃ under the nitrogen atmosphere, adding the macromolecular RAFT reagent, stirring and reacting for 2-3h under the protection of nitrogen, and then cooling to room temperature to obtain a polymer emulsion;
4) dissolving N, N-dimethyl epoxy propyl dodecyl ammonium chloride in water, then dropwise adding the solution into the polymer emulsion, adjusting the pH of the emulsion system to 8-9 by using hydrochloric acid and sodium hydroxide solution, and heating to 80 ℃ for reaction for 8 hours;
5) and after the reaction is finished, cooling to room temperature, dialyzing, freezing and drying to obtain the modified cellulose filtrate reducer.
3. The efficient oil drilling fluid according to claim 2, wherein the mass ratio of the carboxymethyl cellulose to the xanthate to the N, N-dicyclohexylcarbodiimide to the 4-dimethylaminopyridine is 1: 1-5: 0.1-0.5.
4. The high-efficiency oil drilling fluid according to claim 2, wherein the molar ratio of the macro-RAFT agent to the 2-acrylamido dodecyl sulfonic acid, the acrylamide, the hydroxyethyl acrylate, the initiator and the emulsifier is 1: 50-100: 50-80: 60-100: 0.1-0.5; the mol ratio of the N, N-dimethyl epoxy propyl dodecyl ammonium chloride to the hydroxyethyl acrylate is 1: 1.
5. The efficient oil drilling fluid as claimed in claim 1, wherein the mass ratio of the acrylonitrile to the styrene is 1: 0.5-1, and the mass ratio of the polyacrylonitrile-styrene copolymer, the multi-walled carbon nanotube and the calcium carbonate is 1: 0.01-0.1: 0.5-1.
6. The high-efficiency oil drilling fluid according to claim 1, wherein the weighting agent is one or more of barite, calcium carbonate powder, iron ore powder and hematite powder.
7. The preparation method of the high-efficiency petroleum drilling fluid as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps: uniformly stirring and mixing water and bentonite at the stirring speed of 2500-3500r/min, and sealing and standing for 24 h; then adding potassium chloride, modified cellulose filtrate reducer, plugging material and weighting agent, and uniformly stirring at the stirring speed of 7000-9000r/min to prepare the high-efficiency petroleum drilling fluid.
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| CN112708403A (en) * | 2020-12-29 | 2021-04-27 | 扬州工业职业技术学院 | Petroleum drilling fluid and preparation method thereof |
| CN113773818B (en) * | 2021-10-08 | 2023-05-12 | 扬州工业职业技术学院 | Inhibitor for water-based drilling fluid and preparation method thereof |
| CN114574267A (en) * | 2022-03-29 | 2022-06-03 | 北京市政建设集团有限责任公司 | Shield tail sealing grease for shield tunneling machine and preparation method thereof |
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