A fatty acid amide type thinning agent for drilling in the Antarctic, its preparation method and application

Abstract

The application provides a fatty acid amide type drilling fluid thinner for the Antarctic, and a preparation method and application thereof. The fatty acid amide type drilling fluid thinner for the Antarctic is prepared by dehydration and polycondensation reaction of palmitic acid, triethanolamine and a polyamine compound in the presence of a catalyst; the polyamine compound is one of hydroxyethyl ethylenediamine, 5-(N-ethyl-N-2-hydroxyethylamine)-2-pentylamine and N,N'-dihydroxyethyl ethylenediamine; and the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid. The drilling fluid thinner has excellent thinning performance and good suspending performance, and the plastic viscosity is controllable, so that the rheological performance of the drilling fluid at ultralow temperature can be effectively improved, the carrying and suspending of the drilling fluid on rock cuttings and ice cuttings in the drilling process in the Antarctic can be improved, and then safe and efficient drilling can be ensured.

Description

Technical Field

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

[0002] Antarctica is rich in resources, including oil, natural gas, iron, coal, copper, and diamonds. However, the harsh climate and geology of the Antarctic region present significant challenges for drilling operations. Drilling fluids, the lifeblood of drilling, currently suffer from poor rheological properties and poor chip transport (ice and rock) performance. Therefore, developing a treatment agent that effectively improves the rheological properties of drilling fluids in the Antarctic is crucial.

[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 with dimerized fatty acid, polyethylene polyamine and triethylene glycol monobutyl ether as raw materials, which effectively improves the viscosity and shear force of the soil-free oil-based drilling fluid. It also has the advantages of strong inhibition and high temperature resistance. Chinese patent document CN106566495A discloses a viscosity-enhancing shearing agent prepared with poly fatty acid and terminal amino polyether as raw materials, which can significantly improve the dynamic shear force of the drilling fluid system, indicating that the suspension ability 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 acid and oligoamide as raw materials. It has a multi-branched amphiphilic structure, which makes the mechanical radius small and the viscosity effect low, thereby achieving the effect of low viscosity and high shear in high-density oil-based drilling fluid. Chinese patent document CN107805286A discloses a shear-enhancing agent based on styrene-vinyl carboxylic acid copolymer, diamine, and fatty acid, and its preparation method. This invention demonstrates high dynamic and static suspension capabilities in oil-based drilling fluids, with a shear-enhancing rate exceeding 40%. However, there are few reports on the development of shear-enhancing agents for Antarctic drilling fluids.

[0004] Therefore, there is an urgent need to develop Antarctic drilling fluid shearing agents with excellent shearing performance, good suspension performance, and controllable plastic viscosity, so as to improve the drilling fluid's ability to carry and suspend rock and ice chips during Antarctic drilling, thereby ensuring safe and efficient drilling. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides a fatty acid amide-based shearing agent for Antarctic drilling, its preparation method, and its application. The shearing agent of the present invention can effectively improve the ultra-low temperature rheological properties of drilling fluids, and improve the drilling fluid's cuttings carrying and suspension properties.

[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; and the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid.

[0008] According to the present invention, preferably, 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-based cutting agent for Antarctic drilling comprises the following steps:

[0011] (1) mixing palmitic acid and triethanolamine, stirring uniformly, 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; 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] According to the preferred embodiment of the present invention, the stirring rate in step (1) is 300-320 r / min, and the stirring time is 10-15 min.

[0015] According to the preferred embodiment of the present invention, the nitrogen gas flow time in step (1) is 15 to 30 minutes.

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

[0017] According to a preferred embodiment of the present invention, in step (2), when the first reaction product is cooled to 80-90° C., the polyamine compound and the 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 to 1.05:1.

[0019] According to the present invention, preferably, 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 98 wt %; the mass of the catalyst is 0.5-1% of the total mass of palmitic acid and triethanolamine.

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

[0021] According to the preferred embodiment of the present invention, the nitrogen gas flow time in step (2) is 15 to 30 minutes.

[0022] According to the preferred embodiment of 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-based shearing agent for Antarctic drilling is applied to drilling fluid for Antarctic formations, and the content of the fatty acid amide-based shearing agent for Antarctic drilling in the drilling fluid is 1-3 wt%.

[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 molecules contain polar groups such as amino, ester, and hydroxyl groups, which can be adsorbed on the surface of organic soil particles through hydrogen bonds. HQA, through intermolecular forces, forms a spatial grid structure, effectively increasing the dynamic shear force of the drilling fluid and the viscosity under low shear rate conditions, thereby improving the rheological properties of the drilling fluid. The shearing agent of the present invention is applied to drilling fluids for polar drilling, and can effectively improve the ultra-low temperature rheological properties of the drilling fluid, and improve the cuttings carrying capacity and suspension performance of the drilling fluid.

[0028] 3. The monomers used in the shearing agent of the present invention are optimally combined in specific types and specific ratios, and their combined effect achieves 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, thereby affecting 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 cuttings 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 with reference to 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-based shearing agent for Antarctic drilling comprises the following steps:

[0033] 1) Palmitic acid and triethanolamine were added to a three-necked flask at a molar ratio of 1.1:1 and stirred at a stirring rate of 300 rpm for 10 minutes until uniformly mixed;

[0034] 2) After nitrogen flow for 20 minutes, the reaction system was heated to 150° C. and reacted at 150° C. for 5 hours 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 a mass ratio of hydroxyethylethylenediamine to triethanolamine of 0.98:1; p-toluenesulfonic acid is then added, with the mass of p-toluenesulfonic acid being 0.8% of the total mass of palmitic acid and triethanolamine; the mixture is then stirred for 10 minutes and then nitrogen is passed through for 20 minutes; the mixture is isothermally reacted at 160° C. at a stirring rate of 300 r / min for 3 hours, and after completion of the reaction, 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-based shearing 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 rpm for 10 minutes until the mixture is uniformly mixed;

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

[0040] 3) Cooling the first reaction product to 80° C., adding hydroxyethylethylenediamine at a stirring rate of 300 r / min, wherein the mass ratio of hydroxyethylethylenediamine to triethanolamine is 0.98:1; then adding p-toluenesulfonic acid, wherein the mass of p-toluenesulfonic acid added is 0.8% of the total mass of palmitic acid and triethanolamine; stirring for 10 minutes, and then passing nitrogen for 20 minutes; isothermal reaction at 160° C. at a stirring rate of 300 r / min for 3 hours, and naturally cooling to room temperature after completion of the reaction to obtain a fatty acid amide shearing agent for Antarctic drilling.

[0041] Example 3

[0042] A method for preparing a fatty acid amide-based shearing 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 minutes until the mixture is uniformly mixed;

[0044] 2) After nitrogen flow for 20 minutes, the reaction system was heated to 150° C. and reacted at this temperature for 4 hours at a stirring rate of 300 rpm to obtain a first reaction product;

[0045] 3) Cooling the first reaction product to 80° C., adding hydroxyethylethylenediamine at a stirring rate of 300 r / min, wherein the mass ratio of hydroxyethylethylenediamine to triethanolamine is 0.98:1; then adding p-toluenesulfonic acid, wherein the mass of p-toluenesulfonic acid added is 0.8% of the total mass of palmitic acid and triethanolamine; stirring for 10 minutes, and then passing nitrogen for 20 minutes; isothermal reaction at 160° C. at a stirring rate of 300 r / min for 3 hours, and naturally cooling to room temperature after completion of the reaction 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 hydroxyethylethylenediamine is replaced with amphetamine in step 3). Other conditions are the same as in Example 1.

[0048] Comparative Example 2

[0049] 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 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. 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] The preparation method of a fatty acid amide 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 was composed as follows: first, 4# aviation kerosene and 5# white oil were prepared in a volume ratio of 6:4 to prepare a base oil, totaling 320 mL; second, H400 (organic soil) was added to the base oil at a volume ratio of 3% by weight of the base oil, and the mixture was stirred for 20 minutes to prepare a drilling fluid base fluid; then, the shearing agent described in the examples or comparative examples was added to the drilling fluid base fluid at a volume ratio of 2% by weight of the drilling fluid base fluid, and the mixture was stirred for 30 minutes on a high-speed stirrer (600 rpm) to obtain a drilling fluid sample; and the performance of the shearing agent was 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 and use a low-temperature rheometer to measure the 600r and 300r readings at -55°C. Then calculate the relevant rheological parameters such as apparent viscosity, plastic viscosity, dynamic shear force and shear 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] The data in Table 1 show that the drilling fluid shearing agent prepared by the present invention can significantly improve the rheological properties of the drilling fluid. At -55°C, the dynamic shear force of the drilling fluid can reach above 2.50 Pa, and the shearing rate can reach above 400%. The shearing effect is significant, and the viscosity increase is controllable. In addition, the shearing agent can increase the viscosity of the drilling fluid (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, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection 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 appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0076] In addition, the 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-based 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'-bis(hydroxyethylethylenediamine); the catalyst is one of concentrated sulfuric acid or p-toluenesulfonic acid; The molar ratio of the palmitic acid to triethanolamine is (1-1.4):1; the mass ratio of the polyamine compound to triethanolamine is 0.7-1.05:

1.

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

3. The method for preparing the fatty acid amide-based cutting agent for Antarctic drilling according to claim 1, comprising the following steps: (1) Palmitic acid and triethanolamine are mixed, stirred evenly, and reacted after nitrogen is passed through 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; then cooling to obtain a fatty acid amide shearing agent for Antarctic drilling.

4. The preparation method of the fatty acid amide-based cutting agent for Antarctic drilling according to claim 3, wherein: 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.

5. The preparation method of the fatty acid amide-based cutting agent for Antarctic drilling according to claim 3, wherein: In step (2), when the first reaction product is cooled to 80-90° C., a polyamine compound and a catalyst are added.

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

7. The preparation method of the fatty acid amide-based cutting agent for Antarctic drilling according to claim 3, wherein: 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.

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

9. The application according to claim 8, characterized in that: The fatty acid amide-based shearing agent for Antarctic drilling is applied to drilling fluid for Antarctic formations, and the content of the fatty acid amide-based shearing agent for Antarctic drilling in the drilling fluid is 1-3 wt %.

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