Expansion pipe inner wall spraying preparation for petroleum drilling and production as well as preparation method and application of expansion pipe inner wall spraying preparation

Abstract

The invention belongs to the field of expansion pipes for petroleum drilling and production, and discloses an expansion pipe inner wall spraying preparation for petroleum drilling and production and a preparation method thereof. The spraying preparation comprises 30-40 parts by mass of phenolic resin, 5-8 parts by mass of a graphite lubricant, 2-5 parts by mass of a nano-particle composition, 3-8 parts by mass of an anionic fluorocarbon surfactant and 3-8 parts by mass of a cationic polymeric dispersant, and the nano-particle composition is formed by combining nano-zinc oxide and nano-silica according to the mass ratio of (1-2): 3. The nano zinc oxide and the nano silicon dioxide are added into the spraying preparation, so that the toughness and the strength of the coating are improved; by adding the graphite lubricant, the lubricating effect is achieved; the surfaces of the three particles are coated with the anionic fluorocarbon surfactant, and the cationic polymeric dispersant is dispersed among the particles, so that the dispersity of the particles in the phenolic resin is improved, and the crosslinking degree between the particles and the phenolic resin is enhanced.

Description

Technical Field

[0001] This application belongs to the field of expandable tubes for oil drilling, and particularly relates to an inner wall spraying preparation for expandable tubes used in oil drilling, its preparation method and application. Background Art

[0002] As oil production reaches the middle and late stages of the oilfield, problems often occur during the production process of oil wells, which seriously affect the normal oil production work. Therefore, it is urgent to research and promote new and effective well repair technologies. The proposed expandable tube technology has played a certain role in solving this problem. Currently, expandable tubes have been successfully applied in the ocean, saving a large amount of raw materials. Using expandable tube technology for well completion can significantly increase the oil well production and reduce the drilling and well completion costs.

[0003] In order to reduce the construction operation pressure of the expandable tube and enhance the lubrication between its inner wall and the expansion tool, it is often necessary to add a coating on the inner wall of the expandable tube. In the prior art, the main raw material of this coating is resin. In order to prevent local tearing, fish-scale cracking, etc. of the coating during the expansion process of the expandable tube, which affect the use of the expandable tube, technicians often choose to add various lubricating materials to the coating raw materials, but the effect is limited. Summary of the Invention

[0004] In order to overcome the defects existing in the above-mentioned prior art, the purpose of this application is to provide an inner wall spraying preparation for expandable tubes used in oil drilling and its preparation method, so as to improve the overall toughness and strength of the coating, and prevent the inner wall coating of the expandable tube from generating tears, fish-scale cracks and peeling during the expansion process.

[0005] To achieve the above purpose, this application provides the following technical solutions:

[0006] An inner wall spraying preparation for expandable tubes used in oil drilling, comprising: 30 - 40 parts by mass of phenolic resin, 5 - 8 parts by mass of graphite lubricant, 2 - 5 parts by mass of nano-particle composition, 3 - 8 parts by mass of anionic fluorocarbon surfactant, and 3 - 8 parts by mass of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of (1 - 2) : 3.

[0007] Further, the spraying preparation comprises: 36 parts by mass of phenolic resin, 7 parts by mass of graphite lubricant, 4 parts by mass of nano-particle composition, 5 parts by mass of anionic fluorocarbon surfactant, and 5 parts by mass of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of 1 : 3.

[0008] Further, the specific surface area of the nano-silica is 150 - 200m 2 / g.

[0009] Further, the specific surface area of the nano-zinc oxide is 12 - 24 m 2 / g.

[0010] In a second aspect, the present application discloses a preparation method of a spraying preparation for the inner wall of an expansion tube used in oil drilling, including:

[0011] Weigh graphite lubricant, nano-zinc oxide and nano-silica according to preset mass parts and mix them evenly to obtain a granular mixture A, and heat the granular mixture A;

[0012] Prepare a solution of a preset mass part of an anionic fluorocarbon surfactant and atomize and spray it on the heated granular mixture A;

[0013] Mix the sprayed granular mixture A with a preset mass part of a cationic polymer dispersant to obtain a mixture B;

[0014] Mix the mixture B with a preset mass part of phenolic resin to obtain a spraying preparation.

[0015] Further, the preset mass parts include:

[0016] 30 - 40 mass parts of phenolic resin, 5 - 8 mass parts of graphite lubricant, 2 - 5 mass parts of nano-particle composition, 3 - 8 mass parts of anionic fluorocarbon surfactant, and 3 - 8 mass parts of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of (1 - 2):3.

[0017] Further, the preset mass parts include:

[0018] 36 mass parts of phenolic resin, 7 mass parts of graphite lubricant, 4 mass parts of nano-particle composition, 5 mass parts of anionic fluorocarbon surfactant, and 5 mass parts of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of 1:3.

[0019] Further, heating the granular mixture A includes:

[0020] Heat the granular mixture A to a temperature of 200 - 280 °C.

[0021] In a third aspect, the present application discloses an application of a spraying preparation for the inner wall of an expansion tube used in oil drilling, spraying the inner wall of the expansion tube based on the above spraying preparation.

[0022] Further, the application includes:

[0023] Use a ketone, ester or alcohol resin solvent to prepare the spraying preparation into a solution with a mass fraction of 30 - 40%;

[0024] Mix ethanol and the solution in a volume ratio of 1:10 and dilute to obtain a diluted solution;

[0025] Atomize and spray the diluted solution with high-pressure air at 1.05 - 1.1 times atmospheric pressure. The thickness of the sprayed coating is 2 - 5 μm;

[0026] One to two hours after spraying is completed, use high-pressure air at 1.05 - 1.1 times atmospheric pressure that has been dehumidified to dry the sprayed area.

[0027] Technical effects and advantages of this application:

[0028] 1. In this application, by adding nano-silica and nano-zinc oxide to the spraying preparation, nano-silica has a quasi-particle structure of flocculent and reticular shape, with high strength and good anti-aging performance. Nano-zinc oxide has a hexagonal crystal system crystal or spherical particle structure, with good activity and fluidity. After the two are compounded in a suitable proportion and added to phenolic resin, they can act as stress concentration centers in phenolic resin, induce a large number of crazes and shear bands, consume and absorb a large amount of energy generated during the curing process of phenolic resin. When the expansion tube expands, the internal coating is stretched accordingly. During this process, the generation of internal stress is reduced, which is beneficial to improving the overall toughness and strength and preventing the generation of fish-scale cracks.

[0029] 2. In this application, by adding graphite lubricant to the spraying preparation, it plays a lubricating role. It is doped with nano-silica and nano-zinc oxide. By coating anionic fluorocarbon surfactant on the surface of the three kinds of particles and dispersing cationic polymer dispersant between the particles, it is beneficial to improve the dispersibility of the particles in phenolic resin, enhance the cross-linking degree between the particles and phenolic resin, and further ensure that no tearing, fish-scale cracks and peeling occur on the inner wall coating during the expansion process of the expansion tube.

[0030] Other features and advantages of this application will be described in the subsequent specification, and partly become obvious from the specification, or be understood by implementing this application. The objectives and other advantages of this application can be achieved and obtained through the structures pointed out in the specification, claims and drawings. Brief Description of the Drawings

[0031] Figure 1 It is a flowchart of the preparation method of an inner wall spraying preparation for an expansion tube used in an oil well drilling in this application. Detailed Description of the Invention

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0033] The present application provides a spraying preparation for the inner wall of an expansion pipe used in oil drilling, including: 30-40 parts by mass of phenolic resin, 5-8 parts by mass of graphite lubricant, 2-5 parts by mass of nano-particle composition, 3-8 parts by mass of anionic fluorocarbon surfactant, and 3-8 parts by mass of cationic polymer dispersant. Among them, the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of (1-2):3.

[0034] In some embodiments of the present application, the spraying preparation includes: 36 parts by mass of phenolic resin, 7 parts by mass of graphite lubricant, 4 parts by mass of nano-particle composition, 5 parts by mass of anionic fluorocarbon surfactant, and 5 parts by mass of cationic polymer dispersant. Among them, the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of 1:3.

[0035] It should be noted that nano-silica has a flocculent and reticulated quasi-particle structure with high strength and good anti-aging performance. Nano-zinc oxide has a hexagonal crystal system crystal or spherical particle structure with good activity and fluidity. After the two are compounded in a suitable ratio and added to the phenolic resin, they can act as stress concentration centers in the phenolic resin, induce a large number of crazes and shear bands, consume and absorb a large amount of energy generated during the curing process of the phenolic resin, which is beneficial to improving the overall toughness and strength. When the expansion pipe expands, the internal coating is stretched accordingly. During this process, the generation of internal stress is reduced, which is beneficial to preventing the generation of fish-scale cracks; the graphite lubricant plays a major lubricating role and is doped with nano-silica and nano-zinc oxide; an anionic fluorocarbon surfactant is coated on the surface of the three particles, and a cationic polymer dispersant is dispersed between the particles, which is beneficial to improving the dispersibility of the particles in the phenolic resin, enhancing the cross-linking degree between the particles and the phenolic resin, and further ensuring that no tearing, fish-scale cracks and peeling occur in the inner wall coating during the expansion process of the expansion pipe.

[0036] In some embodiments of the present application, the specific surface area of nano-silica is 150-200m 2 / g.

[0037] In some embodiments of the present application, the specific surface area of nano-zinc oxide is 12-24m 2 / g.

[0038] Second, as Figure 1As shown, the present application discloses a preparation method of a spraying preparation for the inner wall of an expansion pipe used in oil drilling, including:

[0039] Weigh graphite lubricant, nano-zinc oxide and nano-silica according to preset mass parts and mix them evenly to obtain a particle mixture A, and heat the particle mixture A;

[0040] Prepare a solution of an anionic fluorocarbon surfactant according to preset mass parts and atomize and spray it onto the heated particle mixture A;

[0041] Mix the sprayed particle mixture A with a preset mass part of a cationic polymer dispersant to obtain a mixture B;

[0042] Mix the mixture B with a preset mass part of phenolic resin to obtain a spraying preparation.

[0043] In some embodiments of the present application, the preset mass parts include:

[0044] 30-40 mass parts of phenolic resin, 5-8 mass parts of graphite lubricant, 2-5 mass parts of nano-particle composition, 3-8 mass parts of anionic fluorocarbon surfactant, and 3-8 mass parts of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of (1-2):3.

[0045] In some embodiments of the present application, the preset mass parts include:

[0046] 36 mass parts of phenolic resin, 7 mass parts of graphite lubricant, 4 mass parts of nano-particle composition, 5 mass parts of anionic fluorocarbon surfactant, and 5 mass parts of cationic polymer dispersant, wherein the nano-particle composition is composed of nano-zinc oxide and nano-silica in a mass ratio of 1:3.

[0047] In some embodiments of the present application, heating the particle mixture A includes:

[0048] Heat the particle mixture A to a temperature of 200-280°C.

[0049] In a third aspect, the present application discloses an application of a spraying preparation for the inner wall of an expansion pipe used in oil drilling, and spray the inner wall of the expansion pipe based on the above spraying preparation.

[0050] In some embodiments of the present application, the application includes:

[0051] Use a ketone, ester or alcohol resin solvent to prepare the spraying preparation into a solution with a mass fraction of 30-40%;

[0052] Mix ethanol and the solution in a volume ratio of 1:10 for dilution to obtain a diluted solution;

[0053] Atomize and spray the dilution solution with high-pressure air at 1.05 - 1.1 times atmospheric pressure, and the thickness of the sprayed coating is 2 - 5 μm;

[0054] 1 - 2 hours after spraying is completed, use high-pressure air at 1.05 - 1.1 times atmospheric pressure that has been dehumidified to dry the sprayed area.

[0055] To better illustrate this solution, the following examples and comparative examples are also provided.

[0056] Example 1

[0057] Prepare the inner wall spraying preparation for the expansion tube of oil drilling by the following raw materials in parts by mass:

[0058] 36 parts of phenolic resin, 7 parts of graphite lubricant, 4 parts of nano-particle composition, 5 parts of anionic fluorocarbon surfactant, and 5 parts of cationic polymer dispersant. Among them, the nano-particle composition is composed of nano-zinc oxide and nano-silica in a ratio of 1:3, the specific surface area of nano-silica is 150 - 200 m 2 / g, and the specific surface area of nano-zinc oxide is 12 - 24 m 2 / g.

[0059] In this example, the preparation method of the inner wall spraying preparation for the expansion tube of oil drilling includes the following steps:

[0060] (1) Weigh the graphite lubricant, nano-zinc oxide, and nano-silica according to the specified weight parts, uniformly mix the three to form a particle mixture A, heat the particle mixture A to 255°C, configure the specified weight parts of anionic fluorocarbon surfactant into a solution, atomize and spray it onto the heated particle mixture A to make the outside of the particle mixture A coated with anionic fluorocarbon surfactant;

[0061] (2) Uniformly mix the particle mixture with the outside coated with anionic fluorocarbon surfactant with the specified weight parts of cationic polymer dispersant. The cationic polymer dispersant is dispersed between the particles of the particle mixture to form a mixture B, and then add the mixture B to the specified weight parts of phenolic resin and mix evenly.

[0062] Example 2

[0063] Configure the inner wall spraying preparation for the expansion tube of oil drilling by the following raw materials in parts by weight: 30 parts of phenolic resin, 5 parts of graphite lubricant, 2 parts of nano-particle composition, 3 parts of anionic fluorocarbon surfactant, and 3 parts of cationic polymer dispersant. Among them, the nano-particle composition is composed of nano-zinc oxide and nano-silica in a ratio of 2:3, the specific surface area of nano-silica is 150 - 200 m 2 / g, the specific surface area of the nano-zinc oxide is 12 - 24 m 2 / g.

[0064] The preparation method of the spraying preparation for the inner wall of the expansion pipe used in the oil drill of this embodiment includes the following steps:

[0065] (1) Weigh the graphite lubricant, nano-zinc oxide and nano-silica according to the specified weight parts, uniformly mix the three to form a granular mixture A, heat the granular mixture A to 200 °C, configure the specified weight parts of the anionic fluorocarbon surfactant into a solution through a solvent, and atomize and spray it onto the heated granular mixture A to make the outer surface of the granular mixture A coated with the anionic fluorocarbon surfactant;

[0066] (2) Uniformly mix the granular mixture with the outer surface coated with the anionic fluorocarbon surfactant with the specified weight parts of the cationic polymer dispersant. The cationic polymer dispersant is dispersed between the particles of the granular mixture to form a mixture B, and then add the mixture B to the specified weight parts of the phenolic resin and mix evenly.

[0067] Example 3

[0068] Prepare the spraying preparation for the inner wall of the expansion pipe used in the oil drill according to the following weight parts of raw materials: 40 parts of phenolic resin, 8 parts of graphite lubricant, 5 parts of nano-particle composition, 8 parts of anionic fluorocarbon surfactant and 8 parts of cationic polymer dispersant. Among them, the nano-particle composition is composed of nano-zinc oxide and nano-silica in a ratio of 1:3. The specific surface area of the nano-silica is 150 - 200 m 2 / g, the specific surface area of the nano-zinc oxide is 12 - 24 m 2 / g.

[0069] The preparation method of the spraying preparation for the inner wall of the expansion pipe used in the oil drill in this embodiment includes the following steps:

[0070] (1) Weigh the graphite lubricant, nano-zinc oxide and nano-silica according to the specified weight parts, uniformly mix the three to form a granular mixture A, heat the granular mixture A to 280 °C, configure the specified weight parts of the anionic fluorocarbon surfactant into a solution through a solvent, and atomize and spray it onto the heated granular mixture A to make the outer surface of the granular mixture A coated with the anionic fluorocarbon surfactant;

[0071] (2) Uniformly mix the granular mixture with the outer surface coated with the anionic fluorocarbon surfactant with the specified weight parts of the cationic polymer dispersant. The cationic polymer dispersant is dispersed between the particles of the granular mixture to form a mixture B, and then add the mixture B to the specified weight parts of the phenolic resin and mix evenly.

[0072] Comparative Example 1

[0073] The nanoparticle composition of Comparative Example 1 is composed of nano-zinc oxide and nano-silica combined in a mass ratio of 1:1, and the other components are the same as those in Example 1.

[0074] The preparation method of Comparative Example 1 is the same as that of Example 1.

[0075] Comparative Example 2

[0076] The raw materials of Comparative Example 2 are exactly the same as those of Example 1.

[0077] The preparation method of Comparative Example 2 includes the following steps: Weigh each component raw material according to the specified weight parts, and after mixing each component raw material evenly, place it in a solvent to prepare a solution with a mass fraction of 35%.

[0078] Perform performance tests on the preparations obtained in Examples 1-3 and Comparative Examples 1-2, using the existing phenolic resin raw material as the blank control group, and the test results are shown in Table 1:

[0079] Table 1

[0080] Grouping Compressive strength Tensile strength Blank control group 74 MPa 15.43 MPa Example 1 127 MPa 23.67 MPa Example 2 116 MPa 22.15 MPa Example 3 121 MPa 22.46 MPa Comparative example 1 97 MPa 18.44 MPa Comparative example 2 86 MPa 16.71 MPa

[0081] As can be seen from Table 1, the compressive strength and tensile strength of the preparations obtained in Examples 1-3 are greatly improved compared with the control group and Comparative Examples 1-2.

[0082] Spray the inner wall of the expansion tube with the preparations obtained in Examples 1-3 and Comparative Examples 1-2, and prepare 5 expansion tubes with an inner coating respectively. The steps are as follows: Place the expansion tube inner wall spraying preparation for petroleum drilling in a solvent to prepare a solution with a mass fraction of 35%, mix and dilute it with ethanol and the spraying preparation solution according to a volume ratio of 1:10, atomize and spray the diluted solution with high-pressure air at 1.05-1.1 times atmospheric pressure, the thickness of the sprayed coating is 2-5 μm, and after 1-2 hours of spraying, use dehumidified high-pressure air at 1.05-1.1 times atmospheric pressure to dry the inner wall of the pipe.

[0083] Conduct an expansion test on each group of prepared expansion tubes. The expansion pressure is reduced from 28 MPa to 24 MPa, and during the process of expanding a 15-meter expansion tube, the pressure is maintained at 24-25 MPa. After the expansion test, detect the expanded expansion tube, and the detection results are as follows:

[0084] Table 2

[0085]

[0086] As can be seen from Table 2, although the preparations obtained in Examples 1-3 have a small lubricant dosage and no lubricant adhesion enhancer is added, it is still possible to ensure that there are no cracks and fish-scale-like exfoliations on the inner surface of the expansion tube.

[0087] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for spraying a preparation on the inner wall of an expansion tube for oil drilling, characterized in that: include: 30-40 parts by weight of phenolic resin, 5-8 parts by weight of graphite lubricant, 2-5 parts by weight of nanoparticle composition, 3-8 parts by weight of anionic fluorocarbon surfactant and 3-8 parts by weight of cationic polymer dispersant, wherein the nanoparticle composition is composed of nano zinc oxide and nano silicon dioxide in a mass ratio of (1-2):

3.

2. The method for spraying a preparation on the inner wall of an expansion tube for oil drilling according to claim 1, characterized in that: include: 36 parts by mass of phenolic resin, 7 parts by mass of graphite lubricant, 4 parts by mass of nanoparticle composition, 5 parts by mass of anionic fluorocarbon surfactant and 5 parts by mass of cationic polymer dispersant, wherein the nanoparticle composition is composed of nano zinc oxide and nano silicon dioxide in a mass ratio of 1:

3.

3. The method for spraying a preparation on the inner wall of an expansion pipe for oil drilling according to claim 1, characterized in that: The specific surface area of ​​the nano-silicon dioxide is 150-200m 2 / g.

4. The method for spraying a preparation on the inner wall of an expansion tube for oil drilling according to claim 1, characterized in that: The specific surface area of ​​the nano zinc oxide is 12-24m 2 / g.

5. A method for preparing a spray coating agent on the inner wall of an expansion tube for oil drilling, characterized in that: include: Weighing a graphite lubricant, nano zinc oxide and nano silicon dioxide according to preset weight parts and mixing them evenly to obtain a particle mixture A, and heating the particle mixture A; A predetermined amount of anionic fluorocarbon surfactant is prepared into a solution and then atomized and sprayed onto the heated particle mixture A; Mixing the sprayed particle mixture A with a preset mass fraction of a cationic polymer dispersant to obtain a mixture B; The mixture B is mixed with a predetermined amount of phenolic resin to obtain a spray preparation.

6. The method for preparing a spray coating agent for the inner wall of an expansion tube for oil drilling according to claim 5, characterized in that: The preset mass parts include: 30-40 parts by weight of phenolic resin, 5-8 parts by weight of graphite lubricant, 2-5 parts by weight of nanoparticle composition, 3-8 parts by weight of anionic fluorocarbon surfactant and 3-8 parts by weight of cationic polymer dispersant, wherein the nanoparticle composition is composed of nano zinc oxide and nano silicon dioxide in a mass ratio of (1-2):

3.

7. The method for preparing a spray coating agent for the inner wall of an expansion tube for oil drilling according to claim 5, characterized in that: The preset mass parts include: 36 parts by mass of phenolic resin, 7 parts by mass of graphite lubricant, 4 parts by mass of nanoparticle composition, 5 parts by mass of anionic fluorocarbon surfactant and 5 parts by mass of cationic polymer dispersant, wherein the nanoparticle composition is composed of nano zinc oxide and nano silicon dioxide in a mass ratio of 1:

3.

8. The method for preparing a spray coating agent for the inner wall of an expansion tube for oil drilling according to claim 5, characterized in that: The step of heating the particle mixture A comprises: The particle mixture A is heated to 200-280°C.

9. An application of spraying a preparation on the inner wall of an expansion tube for oil drilling, characterized in that: The application is based on spraying the inner wall of the expansion pipe with the spray preparation described in claims 1 to 4.

10. The use of a spraying agent on the inner wall of an expansion pipe for oil drilling according to claim 9, characterized in that: include: The spray preparation is prepared into a solution with a mass fraction of 30-40% using a ketone, ester or alcohol resin solvent; The ethanol and the solution are mixed and diluted in a volume ratio of 1:10 to obtain a diluted solution; Atomizing and spraying the diluted solution using high-pressure air at 1.05-1.1 times the atmospheric pressure, wherein the coating thickness after spraying is 2-5 μm; 1-2 hours after spraying, use dehumidified high-pressure air at 1.05-1.1 times the atmospheric pressure to blow dry the sprayed area.

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