A strong adsorption type temperature-resistant-45 DEG c drilling fluid wetting agent for polar drilling and a preparation method and application thereof

Abstract

The application provides a strong adsorption type temperature-resistant-45 DEG C drilling fluid wetting agent for polar drilling and a preparation method and application thereof, and belongs to the technical field of polar drilling. The wetting agent is prepared from the following raw materials: alkyl amine polyoxyethylene ether, amine-based compound and dimethylacetamide; wherein the alkyl amine polyoxyethylene ether is one of octadecylamine polyoxyethylene ether or dodecylamine polyoxyethylene ether; and the amine-based compound is one of hydroxyurea or 5-hydroxytryptamine. The wetting agent has simple raw material composition and preparation method, is safe and environmentally friendly, and has no irritating odor; the wetting agent is applied to the drilling fluid for polar drilling, can improve the ultralow-temperature dispersion performance and colloid performance of the drilling fluid, effectively solves the problem of poor dispersion performance of organic soil in the drilling fluid under the ultralow-temperature condition, and further improves the polar drilling efficiency.

Description

Technical Field

[0001] The invention relates to a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling, a preparation method and application thereof, and belongs to the technical field of polar drilling. Background Art

[0002] Drilling fluids used in polar regions (such as Antarctica) are primarily thermodynamically unstable systems with a base oil as the external phase. Organic soils in polar drilling fluids often exhibit poor dispersion and sedimentation, leading to deterioration in fluid performance. Therefore, developing a wetting material that can effectively improve the dispersion and colloidal properties of polar drilling fluids is crucial.

[0003] At present, in the field of deep oil and gas development, scholars have conducted extensive research on the development of high-temperature resistant drilling fluid wetting agents. Chinese patent document CN104789196A discloses a wetting agent for oil-based drilling fluid and its preparation method. This invention mainly modifies lecithin by amidation, so that it has good wetting properties and effectively improves its temperature resistance and electrical stability. Chinese patent document CN103194187A discloses a wetting agent for high-density oil-based drilling fluid and its application. This invention is made by mixing Span 80 and Tween 80 in a specific ratio, which can have a good wetting effect on barite in high-density oil-based drilling fluid. Chinese patent document CN103694968A discloses an amidoamine oil-based drilling fluid wetting agent and its preparation method. This wetting agent uses fatty acids as raw materials and is prepared by amidation. Studies have shown that in addition to having good suspension properties for solid particles, it also has a significant improvement effect on the rock carrying capacity and rheological properties of the drilling fluid. However, there is no relevant report on the research of wetting agents for polar ultra-low temperature drilling fluids.

[0004] Currently, there are no reports on research on ultra-low temperature resistant drilling fluid wetting agents for polar drilling. Therefore, there is an urgent need to develop ultra-low temperature drilling fluid wetting agents suitable for polar regions to improve the ultra-low temperature dispersion and colloidal properties of drilling fluids, thereby increasing drilling efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides a highly adsorbable, -45°C temperature-resistant drilling fluid wetting agent for polar drilling, as well as its preparation method and application. The wetting agent of the present invention has simple raw material composition and preparation method, and the resulting wetting agent is safe, environmentally friendly, and odorless. When used in polar drilling fluids, the wetting agent can improve the ultra-low-temperature dispersion and colloidal properties of the drilling fluid, effectively resolving the problem of poor dispersion of organic soil in drilling fluids under ultra-low temperature conditions, thereby improving polar drilling efficiency.

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

[0007] A strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling, prepared from the following raw materials: alkylamine polyoxyethylene ether, amino compound, dimethylacetamide;

[0008] The molar ratio of the alkylamine polyoxyethylene ether to the amino compound is 1:(1.5-2.2); the mass of dimethylacetamide is 60-65% of the total mass of the alkylamine polyoxyethylene ether and the amino compound; the alkylamine polyoxyethylene ether is one of octadecylamine polyoxyethylene ether and dodecylamine polyoxyethylene ether; and the amino compound is one of hydroxyurea and 5-hydroxytryptamine.

[0009] According to the present invention, preferably, the alkylamine polyoxyethylene ether is octadecylamine polyoxyethylene ether.

[0010] According to the present invention, preferably, the amino compound is hydroxyurea.

[0011] According to the preferred embodiment of the present invention, the molar ratio of the alkylamine polyoxyethylene ether to the amino compound is 1:(1.6-1.8).

[0012] The preparation method of the above-mentioned strong adsorption type temperature-resistant -45°C drilling fluid wetting agent for polar drilling includes the steps of: fully mixing and evenly dispersing alkylamine polyoxyethylene ether, amino compound and dimethylacetamide, reacting, filtering and distilling under reduced pressure to obtain the strong adsorption type drilling fluid wetting agent for polar drilling.

[0013] According to the present invention, the reaction is preferably carried out in the absence of oxygen and under the protection of a protective gas; the protective gas is nitrogen or argon.

[0014] According to the present invention, preferably, the reaction temperature is 140° C. to 160° C., the reaction time is 4 to 6 hours, and the reaction is carried out under stirring at a stirring rate of 350 to 400 r / min.

[0015] Preferably, the reaction temperature is 150° C. to 160° C., the reaction time is 5 to 6 hours, and the stirring rate is 350 to 370 r / min.

[0016] The application of the above-mentioned strong adsorption type temperature-resistant -45°C drilling fluid wetting agent for polar drilling in polar formation drilling.

[0017] Preferably according to the present invention, the polar region is Antarctica.

[0018] According to a preferred embodiment of the present invention, the wetting agent is used in drilling fluid for polar formations.

[0019] The technical features and beneficial effects of the present invention are as follows:

[0020] 1. The raw material composition and preparation method of the wetting agent of the present invention are simple, and the obtained wetting agent is safe, environmentally friendly and has no irritating odor.

[0021] 2. The wetting agent in the present invention is synthesized from two monomers, alkylamine polyoxyethylene ether and hydroxyurea (or 5-hydroxytryptamine) (mainly through the condensation reaction of the hydroxyl and amino groups between the monomers, with dimethylacetamide as a solvent). The wetting agent of the present invention is applied to drilling fluids for polar drilling. The wetting agent molecules are well soluble in base oils due to their lipophilic long carbon chains. In addition, they have a variety of strong polar groups, such as hydroxyl, amino, imino and carbonyl groups. These strong polar groups can be strongly adsorbed on the surface of organic soil particles, significantly improving the lipophilic properties of organic soil in base oil, changing the original "face-to-face connection" to "end-to-end or end-face" connection, forming a spatial grid structure, and thereby improving the ultra-low temperature dispersion performance and ultra-low temperature colloidal stability of the drilling fluid. At the same time, the wetting agent of the present invention is applied to drilling fluids for polar drilling, and the resulting drilling fluid exhibits good low-temperature rheological properties.

[0022] 3. The monomers used in the preparation of the wetting 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. The types of the alkylamine polyoxyethylene ether and the amino compound of the present invention need to be appropriate. If they are not appropriate, the performance of the resulting wetting agent will be reduced. The molar ratio of the alkylamine polyoxyethylene ether and hydroxyurea (or 5-hydroxytryptamine) in the present invention needs to be appropriate. If it is not appropriate, the performance of the wetting agent will be reduced; if the ratio is too low, the unreacted hydroxyurea (or 5-hydroxytryptamine) will affect the molecular spatial structure of the target product, thereby affecting its wettability in the drilling fluid. At the same time, the suitability of the reaction time is also directly related to the purity of the reaction product, thereby affecting the performance of the wetting agent; if the reaction time is too short, it will lead to incomplete generation of the target product, thereby affecting the conversion rate of the reaction product and the performance of the wetting agent. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific examples, but is not limited thereto.

[0024] The experimental methods described in the examples are conventional methods unless otherwise specified; the reagents and materials used are commercially available unless otherwise specified.

[0025] In the examples, octadecylamine polyoxyethylene ether, with a total amine value (mgKOH / g) of 44 to 50, was purchased from MacLean Reagent Co., Ltd. Dodecylamine polyoxyethylene ether, with a Mw of 317, was oil-soluble and was purchased from MacLean Reagent Co., Ltd. Tallowamine polyoxyethylene ether, with a total amine value (mgKOH / g) of 115 ± 4, was purchased from MacLean Reagent Co., Ltd.

[0026] Example 1

[0027] A method for preparing a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling comprises the following steps:

[0028] (1) Add octadecylamine polyoxyethylene ether and hydroxyurea to dimethylacetamide, mix thoroughly and disperse evenly, and introduce nitrogen for 15 minutes to make the reaction system completely in an oxygen-free state;

[0029] (2) heating the reaction system to 155°C and carrying out the reaction at a constant temperature for 5 hours at a stirring rate of 360 r / min;

[0030] (3) After the reaction is completed, the reaction product is cooled to room temperature, and the solvent is removed by filtration and vacuum distillation to obtain a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling.

[0031] The mass of dimethylacetamide is 65% of the total mass of octadecylamine polyoxyethylene ether and hydroxyurea, and the molar ratio of octadecylamine polyoxyethylene ether to hydroxyurea is 1:1.8.

[0032] Example 2

[0033] A method for preparing a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling comprises the following steps:

[0034] (1) Add octadecylamine polyoxyethylene ether and 5-hydroxytryptamine to dimethylacetamide, mix thoroughly and disperse evenly, and introduce nitrogen for 15 minutes to make the reaction system completely in an oxygen-free state;

[0035] (2) heating the reaction system to 155°C and carrying out the reaction at a constant temperature for 5 hours at a stirring rate of 360 r / min;

[0036] (3) After the reaction is completed, the reaction product is cooled to room temperature, and the solvent is removed by filtration and vacuum distillation to obtain a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling.

[0037] The mass of dimethylacetamide is 65% of the total mass of octadecylamine polyoxyethylene ether and 5-hydroxytryptamine, and the molar ratio of octadecylamine polyoxyethylene ether to 5-hydroxytryptamine is 1:1.8.

[0038] Example 3

[0039] A method for preparing a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling comprises the following steps:

[0040] (1) Add octadecylamine polyoxyethylene ether and hydroxyurea to dimethylacetamide, mix thoroughly and disperse evenly, and introduce nitrogen for 15 minutes to make the reaction system completely in an oxygen-free state;

[0041] (2) heating the reaction system to 155°C and carrying out the reaction at a constant temperature for 5 hours at a stirring rate of 360 r / min;

[0042] (3) After the reaction is completed, the reaction product is cooled to room temperature, and the solvent is removed by filtration and vacuum distillation to obtain a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling.

[0043] The mass of dimethylacetamide is 65% of the total mass of octadecylamine polyoxyethylene ether and hydroxyurea, and the molar ratio of octadecylamine polyoxyethylene ether to hydroxyurea is 1:1.6.

[0044] Example 4

[0045] A method for preparing a highly adsorbable -45°C temperature-resistant drilling fluid wetting agent for polar drilling is as described in Example 1, except that in step (2), the reaction temperature is changed from 155°C to 140°C. The other steps and conditions are the same as in Example 1.

[0046] Example 5

[0047] A method for preparing a strong adsorption-type temperature-resistant -45°C drilling fluid wetting agent for polar drilling is as described in Example 1, except that the reaction time in step (2) is changed from 5 hours to 4 hours. The other steps and conditions are the same as in Example 1.

[0048] Example 6

[0049] A method for preparing a highly adsorbable, -45°C temperature-resistant drilling fluid wetting agent for polar drilling is as described in Example 1, except that in step (1), the molar ratio of octadecylamine polyoxyethylene ether to hydroxyurea is changed from 1:1.8 to 1:2.2. The other steps and conditions are the same as those in Example 1.

[0050] Example 7

[0051] A method for preparing a strong adsorption-type -45°C temperature-resistant drilling fluid wetting agent for polar drilling is as described in Example 1, except that in step (1), octadecylamine polyoxyethylene ether is replaced with dodecylamine polyoxyethylene ether, and the other steps and conditions are the same as in Example 1.

[0052] Example 8

[0053] A method for preparing a highly adsorbable -45°C temperature-resistant drilling fluid wetting agent for polar drilling is as described in Example 1, except that in step (1), the mass of dimethylacetamide is changed to 60% of the total mass of octadecylamine polyoxyethylene ether and hydroxyurea. The other steps and conditions are the same as in Example 1.

[0054] Comparative Example 1

[0055] A cationic wetting agent: dioctadecyldimethylammonium chloride (DODMAC).

[0056] Comparative Example 2

[0057] A method for preparing a drilling fluid wetting agent is as described in Example 1, except that in step (1), octadecylamine polyoxyethylene ether is replaced with tallowamine polyoxyethylene ether, and the other steps and conditions are the same as those in Example 1.

[0058] Comparative Example 3

[0059] A method for preparing a drilling fluid wetting agent is as described in Example 1, except that hydroxyurea is replaced with anilinoacetonitrile in step (1). Other steps and conditions are the same as those in Example 1.

[0060] Comparative Example 4

[0061] A method for preparing a drilling fluid wetting agent is as described in Example 1, except that in step (1), the mass of dimethylacetamide is changed to 70% of the total mass of octadecylamine polyoxyethylene ether and hydroxyurea, and the other steps and conditions are the same as in Example 1.

[0062] Test Example 1

[0063] The wetting agents in Examples 1-8 and Comparative Examples 1-4 were tested for colloid rate, contact angle, and rheological properties.

[0064] (1) Sample preparation:

[0065] The drilling fluid base fluid was composed as follows: first, 4# aviation kerosene and 5# white oil were mixed in a volume ratio of 7:3 to prepare a base oil, totaling 350 mL; secondly, 3% by weight of the base oil of T150 organic clay (produced by Shanghai Wanzhao Fine Chemical Co., Ltd.) was added to prepare a drilling fluid base fluid; and the wetting agents described in the examples or comparative examples were added to the drilling fluid base fluid in an amount of 2% by weight of the base fluid. The samples were thoroughly stirred on a high-speed stirrer for 25 minutes to obtain samples; and the performance of the samples was tested at -45°C.

[0066] (2) Test method:

[0067] Colloid rate test: Pour a certain amount of prepared drilling fluid into a colorimetric tube, then place the tube in a low-temperature constant temperature oven (-45°C) and let it stand for 16 hours. Calculate the colloid rate: Colloid rate = (lower volume / total volume) * 100%. The lower volume refers to the volume of the colloid, and the upper volume refers to the volume of the clear liquid after sedimentation.

[0068] Rheological test: Pour a certain amount of prepared drilling fluid into the test slurry cup, use a low-temperature rheometer to test the 600r and 300r readings at -45°C, and then calculate the relevant rheological parameters.

[0069] Contact angle test: The mica sheet was immersed in the prepared drilling fluid and frozen at -45°C in a DW-40 ultra-low temperature constant temperature chamber for 16 hours. The contact angle was then measured using a contact angle meter. The mica sheet was removed and the contact angle between the oil droplet and the mica sheet was measured using a 5.0 μL oil droplet as a probe. Each sample was measured three times, and the average value was recorded.

[0070] The test results of colloid rate, rheological properties and contact angle are shown in Table 1.

[0071] Table 1 Performance test of drilling fluid wetting agent at -45℃

[0072]

[0073] The data in Table 1 show that the drilling fluid wetting agent prepared by the present invention has good lipophilicity and a contact angle of less than 15.6°. It can effectively improve the dispersion of organic soil in base oil at -45°C, and the colloid rate can still reach more than 79.0% after standing for 16 hours. It also has a good shearing effect, and the shearing rate at -45°C can reach more than 100%, indicating that the wetting agent can also make the drilling fluid have good ultra-low temperature rheological properties.

[0074] In summary, the -45°C temperature-resistant drilling fluid wetting agent of the present invention can meet the needs of polar drilling.

[0075] 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.

[0076] 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.

[0077] 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 strong adsorption type temperature-resistant -45°C drilling fluid wetting agent for polar drilling, characterized in that: The method comprises the following raw materials: alkylamine polyoxyethylene ether, amino compound, and dimethylacetamide; The molar ratio of the alkylamine polyoxyethylene ether to the amino compound is 1:(1.5-2.2); the mass of dimethylacetamide is 60-65% of the total mass of the alkylamine polyoxyethylene ether and the amino compound; the alkylamine polyoxyethylene ether is one of octadecylamine polyoxyethylene ether and dodecylamine polyoxyethylene ether; and the amino compound is one of hydroxyurea and 5-hydroxytryptamine.

2. The polar drilling strong adsorption type temperature-resistant -45°C drilling fluid wetting agent according to claim 1, characterized in that: The alkylamine polyoxyethylene ether is octadecylamine polyoxyethylene ether.

3. The strong adsorption type -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to claim 1, characterized in that: The amino compound is hydroxyurea.

4. The strong adsorption type -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to claim 1, characterized in that: The molar ratio of the alkylamine polyoxyethylene ether to the amino compound is 1:(1.6-1.8).

5. The method for preparing the strong adsorption type -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to any one of claims 1 to 4, comprising the steps of: thoroughly mixing and uniformly dispersing an alkylamine polyoxyethylene ether, an amino compound, and dimethylacetamide, reacting the mixture, filtering, and distilling under reduced pressure to obtain the strong adsorption type -45°C temperature-resistant drilling fluid wetting agent for polar drilling.

6. The method for preparing the highly adsorbable -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to claim 5, characterized in that: The reaction is carried out in the absence of oxygen and under protective gas protection, the protective gas is nitrogen or argon; the reaction temperature is 140° C. to 160° C., the reaction time is 4 to 6 hours, and the reaction is carried out under stirring conditions at a stirring rate of 350 to 400 r / min.

7. The method for preparing the highly adsorbable -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to claim 6, characterized in that: The reaction temperature is 150°C to 160°C, the reaction time is 5 to 6 hours, and the stirring rate is 350 to 370 r / min.

8. Use of the highly adsorbent -45°C temperature-resistant drilling fluid wetting agent for polar drilling according to any one of claims 1 to 4 in polar formation drilling.

9. The use according to claim 8, characterized in that The polar region is Antarctica.

10. The use according to claim 8, characterized in that The wetting agent is applied to drilling fluid for polar formations.

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