Tackifier as well as preparation method and application thereof

Abstract

The invention provides a tackifier as well as a preparation method and application thereof. The tackifier is prepared from the following raw materials in parts by mass: 100 to 150 parts of polyisobutene, 0 to 80 parts of hydroxypropyl methylcellulose, 50 to 100 parts of unsaturated amino acid ester, 30 to 90 parts of halogenated alkane, 20 to 50 parts of methanesulfonic acid, 10 to 40 parts of polyethylene glycol, 20 to 40 parts of polyvinyl acetate, 10 to 30 parts of methacrylamide, 20 to 40 parts of multi-carboxyl monomer, 20 to 40 parts of sulfonic monomer and 20 to 50 parts of fine flake graphite particles. And 1-5 parts of a surfactant. The tackifier is rich in hydrophobic groups, so that a polymer solution generates chain association in molecules and among molecules, the overall viscosity of the tackifier is improved, the tackifying effect during use is improved, and the fine flake graphite particles improve the heat conduction and high temperature resistance of the tackifier during use.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling fluid, and in particular relates to a tackifier and a preparation method and application thereof. Background Art

[0002] In the process of oil exploration and development, reservoir protection has received more and more attention. Solid particles in drilling fluid are the main damaging factors that cause cracks and pore blockage in oil and gas reservoirs. For this reason, solid-free drilling fluids have been developed at home and abroad. In order to ensure that solid-free and low-solid drilling fluids have higher viscosity and better rheology, it is usually necessary to add viscosity enhancers to increase the viscosity of drilling fluids.

[0003] However, the thermal conductivity of common tackifiers is not good enough during use, which results in poor thermal conductivity of the drill bit during use. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a tackifier and a preparation method and application thereof.

[0005] In a first aspect, the present invention provides a tackifier, wherein the raw materials for preparing the tackifier include, by weight:

[0006]

[0007]

[0008] As a specific embodiment of the present invention, the unsaturated amino acid ester is at least one of diethylaminoethyl methacrylate, N,N-diethylaminoethyl acrylate, 2-methyl-2-acrylate-3-(dimethylamino)propyl ester, and dimethylaminoethyl methacrylate; preferably, the unsaturated amino acid ester is at least one of diethylaminoethyl methacrylate, N,N-diethylaminoethyl acrylate, and dimethylaminoethyl methacrylate.

[0009] As a specific embodiment of the present invention, the halogenated alkane is at least one of 1-chlorododecane, 1-chlorotridecane, 1-chlorodecane, 1-chloro-9-phenylnonane, 1-chloro-7-phenylheptane, 1-chloroundecane, 1-bromododecane, 1-bromodridecane and 1-bromopentadecane.

[0010] As a specific embodiment of the present invention, the polycarboxyl monomer is one of ethyl acetate or triethanolamine.

[0011] As a specific embodiment of the present invention, the sulfonic acid monomer is one of ethyl dimethylsulfonate or ethyl bromosulfonate.

[0012] As a specific embodiment of the present invention, the surfactant is one of tetrabutylammonium bromide and triethylbenzylammonium chloride.

[0013] As a specific embodiment of the present invention, the particle size of the fine flake graphite particles is 100-150 meshes.

[0014] In a second aspect, the present invention provides a method for preparing the tackifier according to the first aspect, comprising the following steps:

[0015] S1: mixing polyisobutylene, hydroxypropyl methylcellulose, unsaturated amino acid ester, halogenated alkane, methyl sulfonic acid, polyethylene glycol, and polyvinyl acetate to obtain a first mixture;

[0016] S2: adding methacryloyl, polycarboxyl monomer, and sulfonic acid monomer to the first mixture, and mixing to obtain a second mixture;

[0017] S3: quaternizing unsaturated amino acid lipids and halogenated alkanes to obtain long-chain hydrophobic monomers;

[0018] S4: adding fine flake graphite particles, a surfactant and the long-chain hydrophobic monomer obtained in step S3 to the second mixture and stirring and mixing to obtain the drilling fluid viscosity enhancer.

[0019] As a specific embodiment of the present invention, the mixing conditions include: a stirring speed of 160-180 rpm and a stirring time of 40-50 minutes.

[0020] As a specific embodiment of the present invention, in step S2, the mixing conditions include heating and stirring under vacuum conditions; the vacuum degree of the vacuum conditions is 0.01-0.04Mpa; the heating temperature is 70-80°C; the stirring speed is 100-120 rpm, and the stirring time is 20-30 minutes.

[0021] As a specific embodiment of the present invention, in step S3, the quaternization reaction conditions include: temperature of 180-220° C., pressure of 0.40-0.50 MPa, and reaction time of 1-3 hours.

[0022] As a specific embodiment of the present invention, in step S4, the mixing conditions include: temperature of 80-85° C., stirring speed of 100-180 rpm, and stirring time of 10-50 minutes.

[0023] In a third aspect, the present invention provides use of the tackifier described in the first aspect or the tackifier prepared by the preparation method described in the second aspect in the field of drilling fluid.

[0024] The above raw materials in the present invention can be prepared in-house or commercially available, and the present invention is not particularly limited thereto.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The thickener of the present invention is prepared by the synergistic effect of a long-chain hydrophobic monomer, a sulfonic acid monomer and methacrylamide to obtain a thickener for drilling fluid. The thickener is an associative polymethacrylamide, which is rich in hydrophobic groups, so that a polymer solution generates chain association within and between molecules, forms a supramolecular structure between molecules, and forms a three-dimensional network structure, and the viscosity of the solution is greatly increased. Even after high shearing, mechanical degradation will not occur, thereby improving the overall viscosity of the thickener and the thickening effect during use. At the same time, the thickener prepared by the method is combined with the added fine flake graphite, so that the thermal conductivity efficiency is greatly improved during use, thereby improving the thermal conductivity and high temperature resistance of the overall thickener during use. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments, but they do not constitute any limitation to the present invention.

[0028] The parts used in the embodiments of the present invention are all parts by weight.

[0029] The average particle size of the fine flake graphite particles used in the embodiments of the present invention is 120 meshes.

[0030] Example 1

[0031] This embodiment provides a tackifier and a preparation method thereof, the specific details are as follows:

[0032] S1: 100 parts of polyisobutylene, 30 parts of hydroxypropyl methylcellulose, 20 parts of methyl sulfonic acid, 10 parts of polyethylene glycol, and 20 parts of polyvinyl acetate were stirred and mixed at a stirring speed of 160 rpm for 40 minutes to obtain a first mixture;

[0033] S2: adding 10 parts of methacryloyl, 20 parts of ethyl acetate, a polycarboxyl monomer, and 20 parts of ethyl dimethylsulfonate, a sulfonic acid monomer, to the first mixture, heating to 75° C. under a vacuum condition of 0.01 MPa and stirring at 100 rpm for 20 minutes to obtain a second mixture;

[0034] S3: quaternization reaction of 50 parts of unsaturated amino acid ester diethylaminoethyl methacrylate and 30 parts of halogenated alkane 1-chlorododecane at 200° C. and 0.40 MPa for 2 hours to obtain a long-chain hydrophobic monomer;

[0035] S4: Add 20 parts of fine flake graphite particles, 1 part of surfactant tetrabutylammonium bromide and 60 parts of the long-chain hydrophobic monomer obtained in step S3 to the second mixture, heat to 82° C., stir at 120 rpm, and stir for 20 minutes to obtain the drilling fluid thickener.

[0036] Example 2

[0037] This embodiment provides a tackifier and a preparation method thereof, the specific details are as follows:

[0038] S1: 150 parts of polyisobutylene, 80 parts of hydroxypropyl methylcellulose, 50 parts of methyl sulfonic acid, 40 parts of polyethylene glycol, and 40 parts of polyvinyl acetate were stirred and mixed at a stirring speed of 170 rpm for 45 minutes to obtain a first mixture;

[0039] S2: adding 30 parts of methacryloyl, 40 parts of triethanolamine, a polycarboxyl monomer, and 40 parts of ethyl bromosulfonate, a sulfonic acid monomer, to the first mixture, heating to 75° C. under a vacuum condition of 0.04 MPa and stirring at 110 rpm for 25 minutes to obtain a second mixture;

[0040] S3: quaternization reaction of unsaturated amino acid ester: 100 parts of N,N-diethylaminoethyl acrylate and halogenated alkane: 90 parts of 1-chlorotridecane at 190° C. and 0.45 MPa for 2.5 hours to obtain a long-chain hydrophobic monomer;

[0041] S4: Add 50 parts of fine flake graphite particles, 5 parts of surfactant triethylbenzyl ammonium chloride and 50 parts of the long-chain hydrophobic monomer obtained in step S3 to the second mixture, heat to 80°C, stir at a speed of 120 rpm, and stir for 20 minutes to obtain the drilling fluid thickener.

[0042] Example 3

[0043] This embodiment provides a tackifier and a preparation method thereof, the specific details are as follows:

[0044] S1: 140 parts of polyisobutylene, 50 parts of hydroxypropyl methylcellulose, 30 parts of methyl sulfonic acid, 20 parts of polyethylene glycol, and 30 parts of polyvinyl acetate were stirred and mixed at a stirring speed of 180 rpm for 50 minutes to obtain a first mixture;

[0045] S2: adding 20 parts of methacryloyl, 30 parts of ethyl acetate, a polycarboxyl monomer, and 30 parts of ethyl bromosulfonate, a sulfonic acid monomer, to the first mixture, heating to 75° C. and stirring at 120 rpm for 30 minutes under a vacuum condition of 0.02 MPa, to obtain a second mixture;

[0046] S3: quaternization reaction of unsaturated amino acid ester: 70 parts of dimethylaminoethyl methacrylate and halogenated alkane: 60 parts of 1-bromopentadecane at 210° C. and 0.50 MPa for 2 hours to obtain a long-chain hydrophobic monomer;

[0047] S4: Add 40 parts of fine flake graphite particles, 3 parts of surfactant tetrabutylammonium bromide and 55 parts of the long-chain hydrophobic monomer obtained in step S3 to the second mixture, heat to 85° C., stir at a speed of 120 rpm, and stir for 20 minutes to obtain the drilling fluid thickener.

[0048] Comparative Example 1

[0049] This comparative example provides a viscosity enhancer, and its preparation method is the same as that of Example 1, except that fine flake graphite particles are not added to prepare the drilling fluid viscosity enhancer.

[0050] Comparative Example 2

[0051] This comparative example provides a viscosity enhancer, and its preparation method is the same as that of Example 1, except that no long-chain hydrophobic monomer is added to prepare the drilling fluid viscosity enhancer.

[0052] Comparative Example 3

[0053] This comparative example provides a viscosity enhancer, and the preparation method thereof is the same as that of Example 1, except that methacrylamide is not added to prepare the drilling fluid viscosity enhancer.

[0054] Test Case

[0055] The drilling fluid thickeners prepared in Examples 1-3 and Comparative Examples 1-3 were tested, and the test data are shown in Table 1:

[0056] Table 1

[0057] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Viscosity(s) 63.5 63.3 62.8 56.7 56.9 57.2 Liquidity (cps) 1..9 1.8 1.7 1.2 1.6 1.5

[0058] As can be seen from Table 1, the viscosity and fluidity of the tackifiers obtained in Examples 1-3 are better than those of the tackifiers in Comparative Examples 1-3.

[0059] Test Example 2

[0060] Preparation of drilling fluid base slurry: 5 parts of bentonite, 3 parts of anhydrous sodium carbonate and 92 parts of water are mixed uniformly by weight to obtain a drilling fluid base slurry.

[0061] The drilling fluid thickeners prepared in Examples 1-3 and Comparative Examples 1-3 were added to the above-mentioned drilling fluid base slurry at a ratio of 5%, and the performance of the drilling fluid was tested. The results are shown in Table 2:

[0062] Table 2

[0063] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Viscosity 64.5 64.3 63.8 57.7 58.9 587.2 Liquidity (cps) 2..9 2.8 2.7 2.2 2.4 2.5

[0064] It can be seen from Table 2 that the viscosity enhancers obtained in Examples 1-3 of the present invention can increase the viscosity and fluidity of the drilling fluid; the effect is better than that of the viscosity enhancers in Comparative Examples 1-3.

[0065] In summary, the thickener of the present invention is prepared by the synergistic effect of long-chain hydrophobic monomers, sulfonic acid monomers and methacrylamide to obtain a drilling fluid thickener, which is an associative polymethacrylamide, wherein the presence of hydrophobic groups is rich, so that the polymer solution produces chain association within and between molecules, and a supramolecular structure is formed between molecules, forming a three-dimensional network structure, and the solution viscosity is greatly increased. Even after high shear, mechanical degradation will not occur, thereby increasing the overall viscosity of the thickener, improving the thickening effect during use, and at the same time, the fine flake graphite particles added are combined, so that the thickener prepared by the modified method has greatly improved thermal conductivity during use, thereby improving the thermal conductivity and high temperature resistance of the overall thickener during use.

[0066] Any numerical value mentioned in the present invention, if there is only an interval of two units between any minimum value and any maximum value, includes all values ​​from the minimum value to the maximum value each time increasing by one unit. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, time, etc. is declared to be 50-90, in this specification it means that 51-89, 52-88... and 69-71 and 70-71 are specifically listed. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 can be appropriately considered as a unit. These are just some specially specified examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed minimum and maximum values ​​are considered to have been disclosed.

[0067] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A tackifier, characterized in that The raw materials for its preparation include, by weight:

2. The tackifier according to claim 1, characterized in that The unsaturated amino acid ester is at least one of diethylaminoethyl methacrylate, N,N-diethylaminoethyl acrylate, 2-methyl-2-acrylate-3-(dimethylamino)propyl ester, and dimethylaminoethyl methacrylate.

3. The tackifier according to claim 1 or 2, characterized in that The halogenated alkane is at least one of 1-chlorododecane, 1-chlorotridecane, 1-chlorodecane, 1-chloro-9-phenylnonane, 1-chloro-7-phenylheptane, 1-chloroundecane, 1-bromododecane, 1-bromodridecane and 1-bromopentadecane.

4. The drilling fluid viscosity enhancer according to any one of claims 1 to 3, characterized in that: The polycarboxyl monomer is one of ethyl acetate and triethanolamine; and / or, The sulfonic acid monomer is one of ethyl dimethylsulfonate or ethyl bromosulfonate; and / or, The surfactant is one of tetrabutylammonium bromide and triethylbenzylammonium chloride.

5. The tackifier according to any one of claims 1 to 4, characterized in that The particle size of the fine flake graphite particles is 100-150 meshes.

6. A method for preparing the tackifier according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: mixing polyisobutylene, hydroxypropyl methylcellulose, unsaturated amino acid lipid, halogenated alkane, methyl sulfonic acid, polyethylene glycol, and polyvinyl acetate to obtain a first mixture; S2: adding methacryloyl, polycarboxyl monomer, and sulfonic acid monomer to the first mixture, and mixing to obtain a second mixture; S3: quaternizing unsaturated amino acid lipids and halogenated alkanes to obtain long-chain hydrophobic monomers; S4: adding fine flake graphite particles, a surfactant and the long-chain hydrophobic monomer obtained in step S3 to the second mixture and stirring and mixing to obtain the drilling fluid viscosity enhancer.

7. The preparation method according to claim 6, characterized in that: In the step S1, the mixing conditions include: a stirring speed of 160-180 rpm and a stirring time of 40-50 minutes.

8. The preparation method according to claim 6 or 7, characterized in that: In step S2, the mixing conditions include heating and stirring under vacuum conditions; the vacuum degree of the vacuum conditions is 0.01-0.04Mpa; the heating temperature is 70-80°C; the stirring speed is 100-120 rpm, and the stirring time is 20-30 minutes.

9. The preparation method according to any one of claims 6 to 8, characterized in that: In step S3, the quaternization reaction conditions include: temperature of 180-220° C., pressure of 0.40-0.50 MPa, and reaction time of 1-3 hours; and / or In the step S4, the mixing conditions include: temperature of 80-85° C., stirring speed of 100-180 rpm, and stirring time of 10-50 minutes.

10. Use of the tackifier according to any one of claims 1 to 5 or the tackifier prepared by the preparation method according to any one of claims 6 to 9 in the field of drilling fluid.

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