Efficient polyamine inhibitor as well as preparation method and application thereof

Abstract

The invention provides an efficient polyamine inhibitor as well as a preparation method and application thereof, and particularly relates to the technical field of well drilling. The high-efficiency polyamine inhibitor provided by the invention is prepared from the following components in parts by mass: 70 to 90 parts of polyamine containing a multi-branched core and 10 to 30 parts of polyamine containing a hyperbranched structure, the polyamine containing the multi-branched core is obtained by carrying out first condensation reaction on amino polybasic acid and hydroxyl polybasic acid and then carrying out second condensation reaction with polyethylene polyamine; the polyamine containing the hyperbranched structure is obtained by carrying out free radical self-polymerization on triallylamine and then carrying out free radical copolymerization on the triallylamine and allylamine. The inhibitor provided by the invention has a relative inhibition rate of 100% at normal temperature and high temperature, basically has no influence on the viscosity and water loss of the drilling fluid, and has the advantages of good inhibition, strong temperature resistance and difficult bubbling.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling, and in particular relates to a high-efficiency polyamine inhibitor and a preparation method and application thereof. Background Art

[0002] In recent years, the consumption of global oil and gas resources has been on the rise. In sharp contrast to the increasing energy consumption is the increasing depletion of conventional and shallow oil and gas resources. In today's energy crisis, shale oil resources, as an important supplement to conventional oil, play a very important role in China and even in the world. However, areas rich in oil and gas resources have high clay content, which can easily lead to problems such as mud packing of drilling tools and difficulty in wellbore purification. Inhibiting the hydration expansion and hydration dispersion of clay minerals is the fundamental solution to wellbore stability.

[0003] Shale inhibitors refer to drilling fluid additives that can significantly inhibit the volume expansion and dispersion of clay hydration, thereby maintaining the stability of the well wall. The shale inhibitors currently used on the market mainly include potassium chloride, polyols, amine inhibitors, etc. Among them, amine inhibitors have become the most widely used inhibitors due to their small addition amount and good effect.

[0004] Amine inhibitors currently on the market include polyetheramines and polyquaternary ammonium salts. However, polyetheramines have insufficient temperature resistance and are prone to foaming due to their own structure, while polyquaternary ammonium salts have a significant impact on the filtration loss and viscosity of drilling fluids. Therefore, it is of great significance to develop an efficient polyamine inhibitor with little impact on drilling fluid performance. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a high-efficiency polyamine inhibitor and its preparation method and application. The high-efficiency polyamine inhibitor provided by the present invention has little effect on the filtration loss and viscosity of the drilling fluid, has strong temperature resistance, and is not easy to foam.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The present invention provides a highly efficient polyamine inhibitor, which comprises the following components based on 100 parts by total weight: 70 to 90 parts of a polyamine containing a multi-branched core and 10 to 30 parts of a polyamine containing a hyperbranched structure;

[0008] The polyamine containing a multi-branched core is obtained by a first condensation reaction of an amino polyacid and a hydroxy polyacid and then a second condensation reaction with polyethylene polyamine;

[0009] The hyperbranched structure-containing polyamine is obtained by free radical self-polymerization of triallylamine and then free radical copolymerization with allylamine.

[0010] Preferably, in parts by mass, the amino polyacid is 6 to 12 parts, the hydroxy polyacid is 15 to 25 parts, and the polyethylene polyamine is 30 to 60 parts;

[0011] In terms of weight, the triallylamine is 5 to 15 parts, and the allylamine is 85 to 95 parts.

[0012] Preferably, the amino polyacid comprises ethylenediaminetetraacetic acid;

[0013] The hydroxy polyacid includes citric acid and / or malic acid;

[0014] The polyethylene polyamine includes diethylene triamine and / or triethylene tetramine.

[0015] The present invention also provides a method for preparing the high-efficiency polyamine inhibitor described in the above technical solution, comprising the following steps:

[0016] Mixing an amino polyacid, a hydroxy polyacid and a first catalyst to carry out a first condensation reaction to obtain an amide containing a multi-branched core;

[0017] The amide containing the multi-branched core is mixed with polyethylene polyamine and a second catalyst to carry out a second condensation reaction to obtain a polyamine containing the multi-branched core;

[0018] In an inert atmosphere, triallylamine is mixed with an initiator to undergo a free radical self-polymerization reaction to obtain polytriallylamine containing a hyperbranched structure;

[0019] The polytriallylamine containing a hyperbranched structure is mixed with allylamine to carry out a free radical copolymerization reaction to obtain a polyamine containing a hyperbranched structure;

[0020] The polyamine containing a multi-branched core is mixed with a polyamine containing a hyperbranched structure to obtain a high-efficiency polyamine inhibitor.

[0021] Preferably, the first catalyst comprises p-toluenesulfonic acid;

[0022] The first condensation reaction is divided into a first-stage reaction and a second-stage reaction;

[0023] The temperature of the first stage reaction is 140-155°C and the time is 1-3h;

[0024] The temperature of the second stage reaction is 160-170°C.

[0025] Preferably, the second catalyst comprises 4-dimethylaminopyrimidine;

[0026] The temperature of the second condensation reaction is 170-190° C., and the time is 3-5 hours.

[0027] Preferably, the reaction system is pressurized before the second condensation reaction, and the pressure of the reaction system is pressurized to 0.05-0.1 kPa.

[0028] Preferably, the initiator comprises benzoyl peroxide and / or azobisisobutylimidazoline hydrochloride;

[0029] The temperature of the free radical self-polymerization reaction is 45-55° C., and the time is 0.5-1.5 h.

[0030] Preferably, the temperature of the free radical copolymerization reaction is 45-55° C. and the time is 3-5 hours.

[0031] The present invention also provides the use of the high-efficiency polyamine inhibitor prepared by the preparation method described in the above technical solution in drilling fluid.

[0032] The invention provides a high-efficiency polyamine inhibitor, which comprises the following components based on 100 parts by weight: 70 to 90 parts of a polyamine containing a multi-branched core and 10 to 30 parts of a polyamine containing a hyperbranched structure; the polyamine containing the multi-branched core is obtained by subjecting an amino polyacid and a hydroxy polyacid to a first condensation reaction and then to a second condensation reaction with polyethylene polyamine; the polyamine containing a hyperbranched structure is obtained by subjecting triallylamine to free radical self-polymerization and then to free radical copolymerization with allylamine. The invention uses amino polyacid as a multi-branched core and polyethylene polyamine as a branched structure to prepare a polyamine containing a multi-branched core, which has a high amine content, has primary amines and secondary amines in the carbon chain, improves the inhibitory performance of the polyamine containing a multi-branched core, and has little effect on the filtration loss and viscosity of the drilling fluid because it does not contain quaternary ammonium salts; uses triallylamine as a hyperbranched core and allylamine as a branched structure to prepare a polyamine containing a hyperbranched structure, which has a high amine content, has primary amines and secondary amines in the carbon chain, improves the inhibitory performance of the polyamine containing a hyperbranched structure, and has little effect on the filtration loss and viscosity of the drilling fluid because it does not contain quaternary ammonium salts; the polyamine containing a multi-branched core and the polyamine containing a hyperbranched structure are compounded to synergistically enhance the inhibitory effect of the high-efficiency polyamine inhibitor. The prepared high-efficiency polyamine inhibitor has strong temperature resistance and is not easy to foam due to the special branched core and branched structure, and is convenient for on-site application. The results of the examples show that the relative inhibition rate of the high-efficiency polyamine inhibitor prepared by the present invention reaches 100% at both room temperature and high temperature, and has little effect on the viscosity and water loss of the drilling fluid, showing the remarkable effects of good inhibition, high temperature resistance, and no effect on the performance of the drilling fluid. DETAILED DESCRIPTION

[0033] The present invention provides a highly efficient polyamine inhibitor, which comprises the following components based on 100 parts by total weight: 70 to 90 parts of a polyamine containing a multi-branched core and 10 to 30 parts of a polyamine containing a hyperbranched structure;

[0034] The polyamine containing a multi-branched core is obtained by a first condensation reaction of an amino polyacid and a hydroxy polyacid and then a second condensation reaction with polyethylene polyamine;

[0035] The hyperbranched structure-containing polyamine is obtained by free radical self-polymerization of triallylamine and then free radical copolymerization with allylamine.

[0036] In the present invention, unless otherwise specified, the raw materials and equipment used are commercially available products well known in the art.

[0037] The highly efficient polyamine inhibitor prepared by the present invention comprises 70 to 90 parts of polyamine containing a multi-branched core, based on 100 parts by total weight. In a specific embodiment, the polyamine containing a multi-branched core may be 70 parts, 75 parts, 80 parts, 85 parts or 90 parts.

[0038] In the present invention, the polyamine containing a multi-branched core is obtained by a first condensation reaction of an amino polyacid and a hydroxy polyacid and then a second condensation reaction with polyethylene polyamine.

[0039] In terms of mass fraction, the amino polyacid in the present invention is 6 to 12 parts, and in a specific embodiment, the amino polyacid can be 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts or 12 parts. In the present invention, the amino polyacid preferably includes ethylenediaminetetraacetic acid.

[0040] Based on the unit mass fraction of the amino polyacid, the hydroxy polyacid is 15 to 25 parts. In a specific embodiment, the hydroxy polyacid can be 15 parts, 17 parts, 20 parts, 23 parts or 25 parts. In the present invention, the hydroxy polyacid preferably includes citric acid and / or malic acid.

[0041] Based on the unit mass parts of the amino polyacid, the polyethylene polyamine is 30 to 60 parts. In a specific embodiment, the polyethylene polyamine can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts. In the present invention, the polyethylene polyamine preferably includes diethylenetriamine and / or triethylenetetramine.

[0042] The polyamine containing a multi-branched core prepared by the present invention has an amino polyacid as the multi-branched core and a high amine content, and the obtained polyamine containing a multi-branched core has a strong inhibitory effect; polyethylene polyamine is used as a branched chain structure, which extends the carbon chain and provides primary amines and secondary amines, further improving the inhibitory performance of the polyamine containing a multi-branched core. The prepared polyamine containing a multi-branched core does not contain quaternary ammonium salts, and has little effect on the filtration loss and viscosity of the drilling fluid.

[0043] The total weight parts are 100 parts. The high-efficiency polyamine inhibitor prepared by the present invention includes 10 to 30 parts of polyamine containing a hyperbranched structure. In a specific embodiment, the polyamine containing a hyperbranched structure can be 10 parts, 15 parts, 20 parts, 15 parts or 30 parts.

[0044] In terms of mass parts, the triallylamine in the present invention is 5 to 15 parts. In a specific embodiment, the triallylamine can be 5 parts, 7 parts, 10 parts, 13 parts or 15 parts.

[0045] Based on the unit mass fraction of the triallylamine, the allylamine is 85 to 95 parts. In a specific embodiment, the allylamine can be 85 parts, 90 parts or 95 parts.

[0046] The hyperbranched structure-containing polyamine prepared by the invention has triallylamine as the hyperbranched core and high amine content, and the obtained hyperbranched structure-containing polyamine has a strong inhibitory effect; allylamine is used as a branched structure, which prolongs the carbon chain and provides primary amine and secondary amine, further improving the inhibitory performance of the hyperbranched structure-containing polyamine. The prepared hyperbranched structure-containing polyamine does not contain quaternary ammonium salt, and has little effect on the filtration loss and viscosity of the drilling fluid.

[0047] The invention compounds a polyamine containing a multi-branched core and a polyamine containing a hyperbranched structure, and the synergistic effect enhances the inhibitory effect of the high-efficiency polyamine inhibitor. Due to the special branched core and branched structure, the prepared high-efficiency polyamine inhibitor has strong temperature resistance, is not easy to foam, and is convenient for on-site application.

[0048] The present invention also provides a method for preparing the high-efficiency polyamine inhibitor described in the above technical solution, comprising the following steps:

[0049] Mixing an amino polyacid, a hydroxy polyacid and a first catalyst to carry out a first condensation reaction to obtain an amide containing a multi-branched core;

[0050] The amide containing the multi-branched core is mixed with polyethylene polyamine and a second catalyst to carry out a second condensation reaction to obtain a polyamine containing the multi-branched core;

[0051] In an inert atmosphere, triallylamine is mixed with an initiator to undergo a free radical self-polymerization reaction to obtain polytriallylamine containing a hyperbranched structure;

[0052] The polytriallylamine containing a hyperbranched structure is mixed with allylamine to carry out a free radical copolymerization reaction to obtain a polyamine containing a hyperbranched structure;

[0053] The polyamine containing a multi-branched core is mixed with a polyamine containing a hyperbranched structure to obtain a high-efficiency polyamine inhibitor.

[0054] The present invention mixes amino polyacid, hydroxy polyacid and a first catalyst, and performs a first condensation reaction to obtain an amide containing a multi-branched core.

[0055] The present invention has no special requirements on the mixing method, and the mixing may be carried out by using technical means well known in the art, such as stirring.

[0056] In the present invention, the first catalyst is preferably p-toluenesulfonic acid. Based on the unit mass fraction of the amino polyacid, the amount of the second catalyst is preferably 0.2 to 0.4 parts. In a specific embodiment, the first catalyst can be 0.2 parts, 0.3 parts or 0.4 parts.

[0057] In the present invention, the first condensation reaction is preferably divided into a first-stage reaction and a second-stage reaction; the temperature of the first-stage reaction is preferably 140-155°C, and in a specific embodiment, the temperature of the first-stage reaction can be 140°C, 145°C, 150°C or 155°C; the time is preferably 1-3h, and in a specific embodiment, the time of the first-stage reaction can be 1h, 2h or 3h. In the present invention, the temperature of the second-stage reaction is preferably 160-170°C, and in a specific embodiment, the temperature of the second-stage reaction can be 160°C, 165°C or 170°C. The second-stage reaction is preferably reacted until no water is produced. In the first condensation reaction process of the present invention, under the action of the first catalyst, the hydroxyl group in the hydroxyl polyacid and the carboxyl group in the amino polyacid are condensed to obtain an amide containing a multi-branched core.

[0058] After obtaining the amide containing a multi-branched core, the present invention mixes the amide containing a multi-branched core with polyethylene polyamine and a second catalyst to carry out a second condensation reaction to obtain a polyamine containing a multi-branched core.

[0059] In the present invention, the second catalyst preferably includes 4-dimethylaminopyrimidine. Based on the unit mass fraction of the triallylamine, the amount of the second catalyst is preferably 0.3 to 0.5 parts. In a specific embodiment, the amount of the 4-dimethylaminopyrimidine can be 0.3 parts, 0.4 parts or 0.5 parts.

[0060] In the present invention, the temperature of the second condensation reaction is preferably 170-190°C, and in a specific embodiment, the temperature of the second condensation reaction can be 170°C, 175°C, 180°C, 185°C or 190°C; the time is preferably 3-5h, and in a specific embodiment, the time can be 3h, 4h or 5h. In the second condensation reaction process of the present invention, under the action of the second catalyst, the amine group in the polyethylene polyamine reacts with the carboxyl group in the amide containing the multi-branched core to form an amide, thereby obtaining a polyamine containing the multi-branched core.

[0061] In the present invention, the reaction system is preferably pressurized before the second condensation reaction. The pressure of the reaction system is preferably 0.05-0.1 kPa. In a specific embodiment, the pressure of the reaction system can be 0.05 kPa, 0.06 kPa, 0.07 kPa, 0.08 kPa, 0.09 kPa or 0.1 kPa.

[0062] In the present invention, after the second condensation reaction, it is preferred to further include cooling to 70-85° C. and adding water. Based on the unit mass fraction of the triallylamine, the amount of water is preferably 25-35 parts. In a specific embodiment, the water may be 25 parts, 27 parts, 30 parts, 33 parts or 35 parts. Adding water allows the reaction product to be dispersed, which facilitates the subsequent reaction.

[0063] In the present invention, triallylamine is mixed with an initiator in an inert atmosphere to carry out a free radical self-polymerization reaction to obtain polytriallylamine containing a hyperbranched structure.

[0064] In the present invention, the inert atmosphere is preferably a nitrogen atmosphere. The present invention performs free radical polymerization in an inert atmosphere to avoid inhibition during the free radical polymerization.

[0065] In the present invention, the initiator is preferably benzoyl peroxide and / or azobis(isobutylene)imidazoline hydrochloride (VA-044). Based on the unit mass fraction of the triallylamine, the amount of the initiator is preferably 0.3 to 0.5 parts. In a specific embodiment, the initiator can be 0.3 parts, 0.4 parts or 0.5 parts.

[0066] In the present invention, the temperature of the free radical self-polymerization reaction is preferably 45-55°C. In a specific embodiment, the temperature of the free radical self-polymerization reaction can be 45°C, 50°C or 55°C; the time of the free radical self-polymerization reaction is preferably 0.5-1.5h. In a specific embodiment, the time of the free radical self-polymerization reaction can be 0.5h, 1h or 1.5h.

[0067] After obtaining the polytriallylamine containing a hyperbranched structure, the present invention mixes the polytriallylamine containing a hyperbranched structure with allylamine to carry out a free radical copolymerization reaction to obtain a polyamine containing a hyperbranched structure.

[0068] In the present invention, the temperature of the free radical copolymerization reaction is preferably 45-55°C. In a specific embodiment, the temperature of the free radical copolymerization reaction can be 45°C, 50°C or 55°C; the time is 3-5h. In a specific embodiment, the time can be 3h, 4h or 5h.

[0069] In the present invention, the free radical copolymerization reaction preferably includes pressurizing the reaction system, and the pressure of the pressurized reaction system is preferably 0.05-0.1 kPa. In a specific embodiment, the pressure of the pressurized reaction system can be 0.05 kPa, 0.06 kPa, 0.07 kPa, 0.08 kPa, 0.09 kPa or 0.1 kPa.

[0070] After obtaining the polyamine containing a hyperbranched structure, the present invention mixes the polyamine containing a multi-branched core with the polyamine containing a hyperbranched structure to obtain a high-efficiency polyamine inhibitor.

[0071] The present invention also provides application of the high-efficiency polyamine inhibitor prepared by the preparation method in drilling fluid.

[0072] The present invention has no special requirements on the method and technique of the application, and the commonly used technical means in the art may be adopted.

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with specific embodiments below. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Any modification, equivalent replacement, improvement, etc. made to the implementation methods of the present invention based on the technical essence and general principles of the present invention without creative work should be within the scope of protection of the present invention.

[0074] Example 1

[0075] By mass, add 6 parts of ethylenediaminetetraacetic acid to the reactor, turn on the stirrer, add 15 parts of citric acid, 0.2 parts of p-toluenesulfonic acid, heat to 150°C, react for 2 hours, continue to heat to 165°C, and react until no water is produced. Add 45 parts of diethylenetriamine and 0.3 parts of 4-dimethylaminopyrimidine, pressurize to 0.08 kPa, heat to 180°C, react for 4 hours, cool to 80°C, add 30 parts of water, stir, and cool to room temperature to obtain a polyamine containing a multi-branched core, recorded as component A.

[0076] In another reactor, 15 parts of triallylamine were added by mass, the stirrer was turned on, the temperature was raised to 50°C, nitrogen was passed through, 0.3 parts of benzoyl peroxide were added dropwise, the reaction was continued for 0.5h, the pressure was increased to 0.08kPa, 85 parts of allylamine were added, the reaction was continued for 4h, and a polyamine containing a hyperbranched structure was obtained, which was recorded as component B.

[0077] By weight, 80 parts of a polyamine containing a multi-branched core and 20 parts of a polyamine containing a hyperbranched structure are mixed to obtain a high-efficiency polyamine inhibitor.

[0078] Example 2

[0079] By mass, 12 parts of ethylenediaminetetraacetic acid were added to the reactor, the stirrer was turned on, 20 parts of malic acid and 0.4 parts of p-toluenesulfonic acid were added, the temperature was raised to 150°C, the reaction was continued for 2 hours, the temperature was further raised to 165°C, and the reaction was continued until no water was produced. 60 parts of triethylenetetramine and 0.5 parts of 4-dimethylaminopyrimidine were added, the pressure was increased to 0.08 kPa, the temperature was raised to 180°C, the reaction was continued for 4 hours, the reaction was cooled to 80°C, 30 parts of water were added, the mixture was stirred, and the mixture was cooled to room temperature to obtain a polyamine containing a multi-branched core, which was recorded as component A.

[0080] In another reactor, 5 parts of triallylamine were added by mass, the stirrer was turned on, the temperature was raised to 50°C, nitrogen was passed through, 0.5 parts of VA-044 was added dropwise, the reaction was continued for 0.5h, the pressure was increased to 0.08kPa, 95 parts of allylamine were added, the reaction was continued for 4h, and a polyamine containing a hyperbranched structure was obtained, which was recorded as component B.

[0081] By weight, 80 parts of a polyamine containing a multi-branched core and 20 parts of a polyamine containing a hyperbranched structure are mixed to obtain a high-efficiency polyamine inhibitor.

[0082] Comparative Example 1 (lacking component B)

[0083] 6 parts of ethylenediaminetetraacetic acid were added to the reactor by mass, the stirrer was turned on, 15 parts of citric acid and 0.2 parts of p-toluenesulfonic acid were added, the temperature was raised to 150°C, the reaction was continued for 2 hours, the temperature was further raised to 165°C, and the reaction was continued until no water was produced. 45 parts of diethylenetriamine and 0.3 parts of 4-dimethylaminopyrimidine were added, the pressure was increased to 0.08 kPa, the temperature was raised to 180°C, the reaction was continued for 4 hours, the inhibitor was obtained after the reaction was cooled to 80°C, 30 parts of water were added, the reaction was stirred, and the reaction was continued to cool to room temperature.

[0084] Comparative Example 2 (component B does not contain a hyperbranched core)

[0085] 6 parts of ethylenediaminetetraacetic acid were added to the reactor by mass, the stirrer was turned on, 15 parts of citric acid and 0.2 parts of p-toluenesulfonic acid were added, the temperature was raised to 150°C, the reaction was continued for 2 hours, the temperature was further raised to 165°C, and the reaction was continued until no water was produced. 45 parts of diethylenetriamine and 0.3 parts of 4-dimethylaminopyrimidine were added, the pressure was increased to 0.08 kPa, the temperature was raised to 180°C, the reaction was continued for 4 hours, the reaction was cooled to 80°C, 30 parts of water were added, the reaction was stirred, and the reaction was cooled to room temperature to obtain a polyamine containing a multi-branched core.

[0086] In another reactor, 15 parts of triallylamine were added by mass, the stirrer was turned on, the temperature was raised to 50°C, nitrogen was passed through, 0.3 parts of benzoyl peroxide was added dropwise, and the reaction was carried out for 0.5h to obtain polyamine.

[0087] By weight, 80 parts of a polyamine containing a multi-branched core and 20 parts of a polyamine are mixed to obtain a polyamine inhibitor.

[0088] Comparative Example 3 (component A does not contain a multi-branched core)

[0089] In terms of mass, 15 parts of citric acid are heated to 150°C, 45 parts of diethylenetriamine and 0.3 parts of 4-dimethylaminopyrimidine are added, the pressure is increased to 0.08 kPa, the temperature is increased to 180°C, the reaction is carried out for 4 hours, the mixture is cooled to 80°C, 30 parts of water are added, the mixture is stirred, and the mixture is cooled to room temperature to obtain a polyamine.

[0090] In another reactor, 15 parts of triallylamine were added by mass, the stirrer was turned on, the temperature was raised to 50°C, nitrogen was passed through, 0.3 parts of benzoyl peroxide were added dropwise, the reaction was continued for 0.5h, the pressure was increased to 0.08kPa, 85 parts of allylamine were added, the reaction was continued for 4h, and a polyamine containing a hyperbranched structure was obtained.

[0091] 80 parts by mass of polyamine and 20 parts by mass of polyamine containing a hyperbranched structure are mixed to obtain a polyamine inhibitor.

[0092] The inhibitory properties of the products and their effects on the performance of the base slurry were tested according to standard Q / SH CG0180-2023 and plotted in Table 1. Among them, Nanhua inhibitor NH-1 is a polyamine inhibitor produced by Sinopec Nanjing Chemical Group Co., Ltd.

[0093] Table 1 Performance comparison of inhibitors prepared in Examples 1 to 2 and Comparative Examples 1 to 3

[0094]

[0095] From the data in Table 1, it can be seen that although the Nanhua inhibitor NH-1 has a good inhibitory effect, it has a greater impact on the viscosity and water loss of the drilling fluid. At a dosage of 0.5%, the water loss increased by 6 mL and the apparent viscosity increased by 10 mPa·s.

[0096] In Example 1 and Example 2, not only are the amine values ​​high, but the relative inhibition rates at room temperature and high temperature both reach 100%, and they have little effect on the viscosity and water loss of the drilling fluid, showing the remarkable effects of good inhibition, high temperature resistance, and no effect on the performance of the drilling fluid.

[0097] Comparative Example 1 lacks component B, which is lower than that of Example 1, and has little effect on the performance of the drilling fluid, but its amine value is reduced and the inhibitory effect is weakened. Comparative Example 2, relative to Example 1, does not contain a hyperbranched structure in component B, which changes the structure of component B. Although the amine value increases and the inhibitory property does not change significantly, the viscosity of the system increases and the water loss increases; Comparative Example 3 loses the initial hyperbranched core in component A. Although the amine value increases and the normal temperature inhibitory property is not affected, the high temperature inhibitory effect is reduced, and the mud performance is greatly affected, the viscosity increases, and the water loss increases.

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A highly effective polyamine inhibitor, characterized in that: The total weight parts are 100 parts, and the components include: 70 to 90 parts of polyamine containing a multi-branched core and 10 to 30 parts of polyamine containing a hyperbranched structure; The polyamine containing a multi-branched core is obtained by a first condensation reaction of an amino polyacid and a hydroxy polyacid and then a second condensation reaction with polyethylene polyamine; The hyperbranched structure-containing polyamine is obtained by free radical self-polymerization of triallylamine and then free radical copolymerization with allylamine.

2. The high-efficiency polyamine inhibitor according to claim 1, characterized in that In terms of weight, the amino polyacid is 6 to 12 parts, the hydroxy polyacid is 15 to 25 parts, and the polyethylene polyamine is 30 to 60 parts; In terms of weight, the triallylamine is 5 to 15 parts, and the allylamine is 85 to 95 parts.

3. The high-efficiency polyamine inhibitor according to claim 1 or 2, characterized in that The amino polyacid includes ethylenediaminetetraacetic acid; The hydroxy polyacid includes citric acid and / or malic acid; The polyethylene polyamine includes diethylene triamine and / or triethylene tetramine.

4. The method for preparing a highly efficient polyamine inhibitor according to any one of claims 1 to 3, characterized in that: The following steps are involved: Mixing an amino polyacid, a hydroxy polyacid and a first catalyst to carry out a first condensation reaction to obtain an amide containing a multi-branched core; The amide containing the multi-branched core is mixed with polyethylene polyamine and a second catalyst to carry out a second condensation reaction to obtain a polyamine containing the multi-branched core; In an inert atmosphere, triallylamine is mixed with an initiator to undergo a free radical self-polymerization reaction to obtain polytriallylamine containing a hyperbranched structure; The polytriallylamine containing a hyperbranched structure is mixed with allylamine to carry out a free radical copolymerization reaction to obtain a polyamine containing a hyperbranched structure; The polyamine containing a multi-branched core is mixed with a polyamine containing a hyperbranched structure to obtain a high-efficiency polyamine inhibitor.

5. The preparation method according to claim 4, characterized in that: The first catalyst includes p-toluenesulfonic acid; The first condensation reaction is divided into a first-stage reaction and a second-stage reaction; The temperature of the first stage reaction is 140-155°C and the time is 1-3h; The temperature of the second stage reaction is 160-170°C.

6. The preparation method according to claim 4, characterized in that: The second catalyst includes 4-dimethylaminopyrimidine; The temperature of the second condensation reaction is 170-190° C., and the time is 3-5 hours.

7. The preparation method according to claim 4 or 6, characterized in that: The method further comprises pressurizing the reaction system before the second condensation reaction, wherein the pressure of the reaction system is pressurized to 0.05-0.1 kPa.

8. The preparation method according to claim 4, characterized in that: The initiator includes benzoyl peroxide and / or azobisisobutylimidazoline hydrochloride; The temperature of the free radical self-polymerization reaction is 45-55° C., and the time is 0.5-1.5 h.

9. The preparation method according to claim 4, characterized in that: The temperature of the free radical copolymerization reaction is 45-55° C. and the time is 3-5 hours.

10. Use of the high-efficiency polyamine inhibitor according to any one of claims 1 to 3 or the high-efficiency polyamine inhibitor prepared by the preparation method according to any one of claims 4 to 9 in drilling fluid.

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