Fatty acid amide shear strength improving agent for Antarctic well drilling as well as preparation method and application of fatty acid amide shear strength improving agent

Abstract

The invention provides a fatty acid amide shear strength improving agent for Antarctic well drilling as well as a preparation method and application of the fatty acid amide shear strength improving agent. The fatty acid amide shear strength improving agent for Antarctic well drilling is prepared from palmitic acid, triethanolamine and a polyamine compound through a dehydration polycondensation reaction in the presence of a catalyst, the polyamine compound is one of hydroxyethyl ethylenediamine, 5-(N-ethyl-N-2-hydroxyethyl amine)-2-pentylamine, and N, N '-bis (hydroxyethyl) ethylenediamine; the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid. The shear strength improving agent is excellent in shear strength improving performance, good in suspension performance and controllable in plastic viscosity, the ultralow-temperature rheological property of drilling fluid can be effectively improved, carrying and suspension of rock debris and ice debris by the drilling fluid in the Antarctic drilling process are improved, and then safe and efficient drilling is guaranteed.

Description

Technical Field

[0001] The invention relates to a fatty acid amide shearing agent for Antarctic drilling and a preparation method and application thereof, belonging to the technical field of polar drilling. Background Art

[0002] Antarctica is rich in resources, including oil, natural gas, iron, coal, copper, diamonds and other resources. However, the harsh climate and geological environment in the Antarctic region poses great challenges to drilling projects. Drilling fluid is the blood of drilling. Currently, drilling fluids suitable for the Antarctic region often have problems such as poor rheological properties and poor chip (ice and rock) carrying performance. Therefore, it is crucial to develop a treatment agent that can effectively improve the rheological properties of drilling fluids in the Antarctic region.

[0003] At present, there have been many reports on the research and development of high-temperature resistant drilling fluid shearing agents. Chinese patent document CN104818004A discloses a viscosity-enhancing shearing agent and its preparation method and application. The invention is prepared from dimerized fatty acids, polyethylene polyamines and triethylene glycol monobutyl ether as raw materials, which effectively improves the viscosity and shear force of the soil-free oil-based drilling fluid, and also has the advantages of strong inhibition and high temperature resistance. Chinese patent document CN106566495A discloses a viscosity-enhancing shearing agent prepared from polymerized fatty acids and terminal amino polyethers, which can significantly improve the dynamic shear force of the drilling fluid system, indicating that the suspension capacity of the drilling fluid system is improved. Chinese patent document CN114436885A discloses an oil-based drilling fluid shearing agent and its preparation method. The invention uses fatty acids and oligoamides as raw materials, which have a multi-branched amphiphilic structure, so that the mechanical radius is small and the viscosity effect is low, thereby achieving the effect of low viscosity and high shear in high-density oil-based drilling fluid. Chinese patent document CN107805286A discloses a shearing agent using styrene vinyl carboxylic acid copolymer, diamine and fatty acid as raw materials and its preparation method, which has high dynamic and static suspension capacity in oil-based drilling fluid and a shearing rate of more than 40%. However, there are almost no reports on the research and development of shearing agents for Antarctic drilling fluids.

[0004] Therefore, it is urgent to develop Antarctic drilling fluid shearing agents with excellent shearing performance, good suspension performance, and controllable plastic viscosity, so as to improve the carrying and suspension of rock and ice chips by the drilling fluid during Antarctic drilling, thereby ensuring safe and efficient drilling. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a fatty acid amide shearing agent for Antarctic drilling and its preparation method and application. The shearing agent of the present invention can effectively improve the ultra-low temperature rheological properties of drilling fluid, improve the cuttings carrying performance and suspension performance of drilling fluid and other issues.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A fatty acid amide shearing agent for Antarctic drilling is prepared by reacting palmitic acid, triethanolamine and a polyamine compound in the presence of a catalyst; the polyamine compound is one of hydroxyethylethylenediamine, 5-(N-ethyl-N-2-hydroxyethylamine)-2-pentylamine and N,N'-bishydroxyethylethylenediamine; the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid.

[0008] Preferably according to the present invention, the polyamine compound is hydroxyethylethylenediamine.

[0009] According to the preferred embodiment of the present invention, the dynamic shear force of the shearing agent at -55°C is 2.50-3.00 Pa, the shearing rate is 400-500%, and the viscosity ratio (10s -1 / 100s -1 ) is 2.61~2.74.

[0010] The preparation method of the fatty acid amide cutting agent for Antarctic drilling comprises the following steps:

[0011] (1) mixing palmitic acid and triethanolamine, stirring evenly, passing nitrogen, and reacting to obtain a first reaction product;

[0012] (2) adding a polyamine compound and a catalyst to the first reaction product obtained in step (1), stirring evenly, passing nitrogen, and reacting; and then cooling to obtain a fatty acid amide shearing agent for Antarctic drilling.

[0013] Preferably according to the present invention, the molar ratio of palmitic acid to triethanolamine in step (1) is (1-1.4):1.

[0014] Preferably, according to the present invention, the stirring rate in step (1) is 300-320 r / min, and the stirring time is 10-15 min.

[0015] Preferably, according to the present invention, the time of passing nitrogen in step (1) is 15 to 30 minutes.

[0016] Preferably, according to the present invention, the reaction temperature in step (1) is 140-160° C., and the reaction time is 3.5-5.5 h.

[0017] Preferably according to the present invention, in step (2), when the first reaction product is cooled to 80-90° C., a polyamine compound and a catalyst are added.

[0018] Preferably according to the present invention, the mass ratio of the polyamine compound to triethanolamine in step (2) is 0.7-1.05:1.

[0019] Preferably, according to the present invention, the catalyst in step (2) is p-toluenesulfonic acid or concentrated sulfuric acid, preferably p-toluenesulfonic acid, and the concentration of the concentrated sulfuric acid is 98wt%; the mass of the catalyst is 0.5-1% of the total mass of palmitic acid and triethanolamine.

[0020] Preferably according to the present invention, the stirring rate in step (2) is 300-350 r / min, and the stirring time is 5-10 min.

[0021] Preferably, according to the present invention, the time for passing nitrogen in step (2) is 15 to 30 minutes.

[0022] Preferably, according to the present invention, the reaction temperature in step (2) is 160-170° C.; and the reaction time is 2-3 h.

[0023] According to the present invention, the above-mentioned fatty acid amide shearing agent for Antarctic drilling is used in Antarctic formation drilling.

[0024] Preferably, according to the present invention, the fatty acid amide type shearing agent for Antarctic drilling is applied to drilling fluid for Antarctic formations, and the content of the fatty acid amide type shearing agent for Antarctic drilling in the drilling fluid is 1-3wt%.

[0025] The technical features and beneficial effects of the present invention are as follows:

[0026] 1. The preparation method of the cutting agent of the present invention is simple, and the obtained cutting agent is safe, environmentally friendly and has no irritating odor.

[0027] 2. The shearing agent of the present invention is synthesized from three monomers: palmitic acid, triethanolamine and polyamine. The shearing agent molecule contains polar groups such as amine, ester and hydroxyl groups, which can be adsorbed on the surface of organic soil particles through hydrogen bonds, and HQA forms a spatial grid structure through the joint action of intermolecular forces, which effectively improves the dynamic shear force of the drilling fluid and the viscosity under low shear rate conditions, and improves the rheological properties of the drilling fluid. The shearing agent of the present invention is applied to drilling fluid for polar drilling, which can effectively improve the ultra-low temperature rheological properties of the drilling fluid, improve the cuttings carrying performance and suspension performance of the drilling fluid, and other problems.

[0028] 3. The monomers used in the shearing agent of the present invention are optimally combined in specific types and specific ratios, and work together to achieve the excellent effects of the present invention. In the present invention, a specific type of carboxylic acid is reacted with an amine compound. If the type of carboxylic acid or amine compound is changed, the performance of the resulting shearing agent is reduced; the molar ratio of palmitic acid to triethanolamine in the present invention needs to be appropriate. If the ratio is too low, it will affect the spatial grid structure formed between the shearing agent molecules, and then affect the low-temperature rheological properties of the shearing agent. The shearing agent of the present invention has excellent shearing performance, good suspension performance, and is an Antarctic drilling fluid shearing agent with controllable plastic viscosity, which can improve the carrying and suspension of rock and ice chips by the drilling fluid during Antarctic drilling, thereby ensuring safe and efficient drilling. DETAILED DESCRIPTION

[0029] The present invention will be further described below by means of specific examples, but is not limited thereto.

[0030] The experimental methods described in the examples are conventional methods unless otherwise specified; the reagents and materials used are commercially available unless otherwise specified.

[0031] Example 1

[0032] A method for preparing a fatty acid amide cutting agent for Antarctic drilling comprises the following steps:

[0033] 1) Add palmitic acid and triethanolamine in a molar ratio of 1.1:1 into a three-necked flask, and stir at a stirring rate of 300 r / min for 10 min until the mixture is uniformly mixed;

[0034] 2) After nitrogen was introduced for 20 min, the reaction system was heated to 150° C. and reacted at 150° C. for 5 h at a stirring rate of 300 r / min to obtain a first reaction product;

[0035] 3) The first reaction product is cooled to 80° C., and hydroxyethylethylenediamine (CAS No.: 111-41-1) is added at a stirring rate of 300 r / min, with the mass ratio of hydroxyethylethylenediamine to triethanolamine being 0.98:1; p-toluenesulfonic acid is then added, with the mass of p-toluenesulfonic acid added being 0.8% of the total mass of palmitic acid and triethanolamine; then, the mixture is stirred for 10 min and nitrogen is passed through for 20 min; the mixture is subjected to constant temperature reaction at 160° C. and a stirring rate of 300 r / min for 3 h, and after the reaction is completed, the mixture is naturally cooled to room temperature to obtain a fatty acid amide shearing agent for Antarctic drilling.

[0036] Example 2

[0037] A method for preparing a fatty acid amide cutting agent for Antarctic drilling comprises the following steps:

[0038] 1) Add palmitic acid and triethanolamine in a molar ratio of 1.3:1 into a three-necked flask, and stir at a stirring rate of 300 r / min for 10 min until the mixture is uniformly mixed;

[0039] 2) After nitrogen was introduced for 20 min, the reaction system was heated to 150° C. and reacted at 150° C. for 5 h at a stirring rate of 300 r / min to obtain a first reaction product;

[0040] 3) The first reaction product is cooled to 80° C., and hydroxyethylethylenediamine is added at a stirring rate of 300 r / min, with the mass ratio of hydroxyethylethylenediamine to triethanolamine being 0.98:1; p-toluenesulfonic acid is then added, with the mass of p-toluenesulfonic acid added being 0.8% of the total mass of palmitic acid and triethanolamine; the mixture is subsequently stirred for 10 min and nitrogen is passed through for 20 min; the mixture is subjected to constant temperature reaction at 160° C. and a stirring rate of 300 r / min for 3 h, and the mixture is naturally cooled to room temperature after the reaction is completed, to obtain a fatty acid amide shearing agent for Antarctic drilling.

[0041] Example 3

[0042] A method for preparing a fatty acid amide cutting agent for Antarctic drilling comprises the following steps:

[0043] 1) Add palmitic acid and triethanolamine in a molar ratio of 1.1:1 into a three-necked flask, and stir at a stirring rate of 300 r / min and 150°C for 10 min until the mixture is uniformly mixed;

[0044] 2) After nitrogen was introduced for 20 min, the reaction system was heated to 150° C. and reacted at a constant temperature for 4 h at a stirring rate of 300 r / min to obtain a first reaction product;

[0045] 3) The first reaction product is cooled to 80° C., and hydroxyethylethylenediamine is added at a stirring rate of 300 r / min, with the mass ratio of hydroxyethylethylenediamine to triethanolamine being 0.98:1; p-toluenesulfonic acid is then added, with the mass of p-toluenesulfonic acid added being 0.8% of the total mass of palmitic acid and triethanolamine; the mixture is subsequently stirred for 10 min and nitrogen is passed through for 20 min; the mixture is subjected to constant temperature reaction at 160° C. and a stirring rate of 300 r / min for 3 h, and the mixture is naturally cooled to room temperature after the reaction is completed, to obtain a fatty acid amide shearing agent for Antarctic drilling.

[0046] Comparative Example 1

[0047] A method for preparing a fatty acid amide-based shearing agent for Antarctic drilling is as described in Example 1, except that in step 3), hydroxyethylethylenediamine is replaced by amphetamine, and other conditions are the same as in Example 1.

[0048] Comparative Example 2

[0049] A method for preparing a fatty acid amide-based cutting agent for Antarctic drilling is as described in Example 1, except that palmitic acid is replaced by adipic acid in step 1), and other conditions are the same as in Example 1.

[0050] Comparative Example 3

[0051] A method for preparing a fatty acid amide shearing agent for Antarctic drilling is as described in Example 1, except that the reaction temperature in step 3) is changed from 160°C to 100°C, and the other steps and conditions are the same as in Example 1.

[0052] Comparative Example 4

[0053] A fatty acid shearing agent is prepared according to the method of Example 1 of Chinese patent document CN104818004A.

[0054] Comparative Example 5

[0055] A method for preparing a fatty acid amide-based shearing agent for Antarctic drilling is as described in Example 1, except that palmitic acid is replaced by valproic acid in step 1), and other conditions are the same as in Example 1.

[0056] Comparative Example 6

[0057] A method for preparing a fatty acid amide shearing agent for Antarctic drilling is as described in Example 1, except that in step 3), hydroxyethylethylenediamine is replaced by N-acetylethylenediamine, and other conditions are the same as in Example 1.

[0058] Comparative Example 7

[0059] A method for preparing a fatty acid amide shearing agent for Antarctic drilling is as described in Example 1, except that in step 1), the molar ratio of palmitic acid to triethanolamine is replaced with 1:3, and other conditions are the same as in Example 1.

[0060] Test Example 1

[0061] The rheological properties of the shearing agents in Examples 1-3 and Comparative Examples 1-7 were tested.

[0062] (1) Sample preparation:

[0063] The drilling fluid base fluid is composed as follows: first, 4# aviation kerosene and 5# white oil are prepared into a base oil in a volume ratio of 6:4, with a total of 320 mL; secondly, H400 (organic soil) is added to the base oil at a volume ratio of 3% by mass of the base oil, and stirred for 20 minutes to prepare a drilling fluid base fluid; then, the shearing agent in the embodiment or the comparative example is added to the drilling fluid base fluid, with a mass of 2% by mass of the drilling fluid base fluid, and the mixture is fully stirred on a high-speed stirrer (600 r / min) for 30 minutes to obtain a drilling fluid sample; and the performance of the shearing agent is tested at -55°C.

[0064] (2) Test method:

[0065] Rheological test:

[0066] 1) Viscosity and dynamic shear force test: Pour the prepared drilling fluid into the test slurry cup, use a low-temperature rheometer to test the 600r and 300r readings at -55°C, and then calculate the relevant rheological parameters, such as apparent viscosity, plastic viscosity, dynamic shear force and shear lift rate.

[0067] 2) Low shear rate (10s -1 )Viscosity and high shear rate (100s -1 ) Viscosity ratio test: The prepared drilling fluid is placed in an ultra-low temperature constant temperature box and frozen (-55℃) for 16 hours. Then, the low shear rate viscosity and high shear rate viscosity are tested by a Haake rheometer at 4℃, and the ratio is calculated.

[0068] The rheological properties were determined and the test results are shown in Table 1.

[0069] Table 1 Performance test of drilling fluid cutting agent at -55℃

[0070]

[0071]

[0072] It can be seen from the data in Table 1 that the drilling fluid shearing agent prepared by the present invention can significantly improve the rheological properties of the drilling fluid. Under the condition of -55°C, the dynamic shear force of the drilling fluid can reach more than 2.50Pa, and the shearing rate can reach more than 400%, with significant shearing effect and controllable viscosity increase. In addition, the shearing agent can make the drilling fluid viscosity ratio (10s -1 / 100s -1 ) increased from 1.03 to above 2.61, and the shear thinning performance was good, indicating that the cuttings carrying performance of the drilling fluid can be effectively improved.

[0073] In summary, the fatty acid amide shearing agent for Antarctic drilling of the present invention can meet the needs of polar drilling.

[0074] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0076] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A fatty acid amide cutting agent for Antarctic drilling, characterized in that: The shearing agent is prepared by reacting palmitic acid, triethanolamine and a polyamine compound in the presence of a catalyst; the polyamine compound is one of hydroxyethylethylenediamine, 5-(N-ethyl-N-2-hydroxyethylamine)-2-pentylamine and N,N'-bishydroxyethylethylenediamine; the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid.

2. The fatty acid amide-based cutting agent for Antarctic drilling according to claim 1, characterized in that: The polyamine compound is hydroxyethylethylenediamine.

3. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 1 comprises the following steps: (1) mixing palmitic acid and triethanolamine, stirring evenly, passing nitrogen, and reacting to obtain a first reaction product; (2) adding a polyamine compound and a catalyst to the first reaction product obtained in step (1), stirring evenly, passing nitrogen, and reacting; and then cooling to obtain a fatty acid amide shearing agent for Antarctic drilling.

4. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 3, characterized in that: The molar ratio of palmitic acid to triethanolamine in step (1) is (1-1.4):

1.

5. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 3, characterized in that: In step (1), the stirring rate is 300-320 r / min, and the stirring time is 10-15 min; the nitrogen flow time is 15-30 min; the reaction temperature is 140-160° C., and the reaction time is 3.5-5.5 h.

6. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 3, characterized in that: In step (2), when the first reaction product is cooled to 80-90° C., a polyamine compound and a catalyst are added; the mass ratio of the polyamine compound to triethanolamine is 0.7-1.05:

1.

7. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 3, characterized in that: The catalyst in step (2) is p-toluenesulfonic acid or concentrated sulfuric acid, preferably p-toluenesulfonic acid, and the concentration of the concentrated sulfuric acid is 98wt%; the mass of the catalyst is 0.5-1% of the total mass of palmitic acid and triethanolamine.

8. The method for preparing the fatty acid amide cutting agent for Antarctic drilling according to claim 3, characterized in that: In step (2), the stirring rate is 300-350 r / min, and the stirring time is 5-10 min; the nitrogen flow time is 15-30 min; the reaction temperature is 160-170° C.; and the reaction time is 2-3 h.

9. Use of the fatty acid amide shearing agent for Antarctic drilling according to claim 1 in Antarctic formation drilling.

10. The use according to claim 9, characterized in that: The fatty acid amide type shearing agent for Antarctic drilling is applied to drilling fluid for Antarctic formations, and the content of the fatty acid amide type shearing agent for Antarctic drilling in the drilling fluid is 1-3wt%.

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