Sulfonate filtrate reducer for drilling fluid and preparation method of sulfonate filtrate reducer

Abstract

The invention relates to the technical field of oilfield development, and discloses a sulfonate filtrate reducer for drilling fluid and a preparation method thereof, the preparation method comprises the following steps: adding dehydroabietylamine into a solvent, adding butylene oxide and a catalyst, and reacting to obtain a modifier; the preparation method comprises the following steps: adding 2-acrylamido-2-methylpropanesulfonic acid into deionized water, adjusting the pH value to 7-9, adding sodium p-styrenesulfonate and acrylamide, and stirring to obtain a water phase; adding an emulsifier into the water phase, and stirring to obtain a pre-emulsion; adding an initiator and a modifier into the pre-emulsion under the condition of nitrogen, reacting for 30-60 minutes at the temperature of 30-40 DEG C, heating to 70-90 DEG C, and reacting for 2-4 hours to obtain the sulfonate filtrate reducer for the drilling fluid. The modifier is prepared by taking a natural product derivative dehydroabietylamine as a raw material, and is used for improving the temperature resistance of the filtrate reducer and reducing the filter loss.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and specifically relates to a sulfonate filtration reducer for drilling fluid and a preparation method thereof. Background Art

[0002] A filtration reducer is a chemical agent that can be applied in the process of oilfield drilling and can effectively reduce the filtration loss. With the continuous improvement of exploration technology, more and more deep wells and ultra-deep wells have emerged, which have put higher requirements on the high-temperature resistance performance of the filtration reducer for drilling fluid.

[0003] The invention patent with the publication number CN118406183A discloses a high-temperature resistant filtration reducer for oil-based drilling fluid. The filtration reducer is prepared from the following raw materials: acrylic acid, acrylamide, N-[tris(hydroxymethyl)methyl]acrylamide, dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, 3-((2-(acryloyloxy)ethyl)dimethylammonium)propane-1-sulfonate inner salt, 3-acetyl-N-vinylpyrrolidone, N,N`-methylenebisacrylamide, inorganic base, initiator and water. Although the high-temperature resistance performance of the filtration reducer obtained by this invention has been improved to a certain extent, the high-temperature resistance performance of this filtration reducer still cannot fully meet the existing requirements. Therefore, it is of great significance to develop a filtration reducer with better high-temperature resistance performance. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the disadvantage of poor high-temperature resistance of the filtration reducer in the prior art, so as to provide a sulfonate filtration reducer for drilling fluid and a preparation method thereof, and the obtained filtration reducer has good high-temperature resistance performance and a low filtration loss.

[0005] To solve the above technical problem, a preparation method of a sulfonate filtration reducer for drilling fluid includes the following steps: (1) Adding dehydroabietylamine to a solvent, adding epoxybutene and a catalyst, and reacting to obtain a modifier; (2) Adding 2-acrylamido-2-methylpropanesulfonic acid to deionized water, adjusting the pH to 7-9, then adding sodium styrenesulfonate and acrylamide, and stirring to obtain an aqueous phase; (3) Adding an emulsifier to the aqueous phase and stirring to obtain a pre-emulsion; (4) Under the condition of nitrogen, adding an initiator and a modifier to the pre-emulsion, reacting at 30-40°C for 30-60 minutes, and then heating to 70-90°C and reacting for 2-4 hours to obtain a sulfonate filtration reducer for drilling fluid; The reaction process formula for the preparation of the modifier is: ; The catalyst is at least one of zinc or nano-zinc oxide;

[0006] The emulsifier is at least one of nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether; The initiator is a composite initiator of potassium persulfate and sodium bisulfite; The mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid, sodium styrenesulfonate, acrylamide, and modifier is 40-50:10-20:20-30:10-20.

[0007] Preferably, the solvent in step (1) is N,N-dimethylformamide.

[0008] Preferably, the molar ratio of the dehydroabietylamine to epoxybutene in step (1) is 1:2-1:3, the reaction temperature is 70-100 °C, and the reaction time is 4-8 h.

[0009] Preferably, the mass ratio of the dehydroabietylamine to the catalyst is 100:1-2, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the emulsifier is 4-5:1, and the mass ratio of the modifier to the initiator is 6-15:1.

[0010] Preferably, the mass ratio of the potassium persulfate to the sodium bisulfite is 1:2-2:1.

[0011] Preferably, the mass ratio of the emulsifier to deionized water is 10:120-150.

[0012] Preferably, the stirring time in step (2) is 20-30 min, and the temperature is 25-30 °C.

[0013] Preferably, the stirring time in step (3) is 10-20 min, and the temperature is 25-30 °C.

[0014] The present invention also provides a sulfonate filtrate reducer for drilling fluid, which is prepared by using the described preparation method.

[0015] The technical solution of the present invention has the following advantages: A sulfonate filtrate reducer for drilling fluid and a preparation method thereof provided by the present invention use a natural product derivative, dehydroabietylamine, as a raw material to prepare a modifier, which is used to improve the temperature resistance performance of the filtrate reducer and reduce the filtrate loss. The obtained modifier molecule contains a rigid ring structure, which can enhance its temperature resistance. In addition, the modifier molecule also contains two double bond structures, which can not only polymerize with other components, but also act as a cross-linking agent to further promote the polymerization between compounds, thereby enhancing the temperature resistance ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the FT-IR diagram of the modifier of the present invention. Detailed implementation manners

[0017] The following embodiments are provided to better further understand the present invention. They are not limited to the best implementation manners, and do not constitute a limitation to the content and protection scope of the present invention. Any product that is the same as or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with those of other prior arts falls within the protection scope of the present invention.

[0018] For those not specifying specific experimental steps or conditions in the embodiments, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0019] FT-IR (Fourier transform infrared spectroscopy) uses a Nicolet IS50 infrared spectrometer.

[0020] Example 1 A preparation method of a sulfonate filtrate reducer for drilling fluid, comprising the following steps: (1) Add 28.5 g of dehydroabietylamine to 300 mL of N,N-dimethylformamide, add 15.6 g of epoxybutene and 0.5 g of nano-zinc oxide, and react at 80 °C for 6 h to obtain a modifier; (2) Add 45 g of 2-acrylamido-2-methylpropanesulfonic acid to 130 g of deionized water, adjust the pH to 8 with 40% sodium hydroxide, then add 15 g of sodium styrenesulfonate and 25 g of acrylamide, and stir at 25 °C for 30 min to obtain an aqueous phase; (3) Add 10 g of fatty alcohol polyoxyethylene ether to the aqueous phase, and stir at 25 °C for 20 min to obtain a pre-emulsion; (4) Under nitrogen conditions, add 0.5 g of sodium bisulfite, 1 g of potassium persulfate and 20 g of the modifier to the pre-emulsion, react at 35 °C for 40 min, then raise the temperature to 80 °C and react for 3 h, and dry the product at 65 °C and pulverize it to obtain a sulfonate filtrate reducer for drilling fluid.

[0021] The FT-IR diagram of the obtained modifier is as Figure 1 shown. It can be seen from Figure 1 that a characteristic absorption peak of hydroxyl appears at 3314.03 cm -1 , a characteristic absorption peak of terminal =C-H appears at 3079.92 cm -1 , and a characteristic absorption peak of carbon-carbon double bond appears at 1623.16 cm -1 .

[0022] Example 2 A preparation method of a sulfonate filtrate reducer for drilling fluid, comprising the following steps: (1) Add 28.5 g of dehydroabietylamine to 300 mL of N,N-dimethylformamide, add 21.0 g of epoxybutene and 0.5 g of nano-zinc oxide, and react at 100 °C for 8 h to obtain a modifier; (2) Add 50 g of 2-acrylamido-2-methylpropanesulfonic acid to 150 g of deionized water, adjust the pH to 9 with 40% sodium hydroxide, then add 20 g of sodium styrenesulfonate and 30 g of acrylamide, and stir at 30 °C for 30 min to obtain an aqueous phase; (3) Add 10 g of fatty alcohol polyoxyethylene ether to the aqueous phase and stir at 30 °C for 20 min to obtain a pre-emulsion; (4) Under nitrogen conditions, add 0.5 g of sodium bisulfite, 0.5 g of potassium persulfate and 15 g of the modifier to the pre-emulsion, react at 40 °C for 60 min, then raise the temperature to 90 °C and react for 4 h, and dry the product at 65 °C and pulverize it to obtain a sulfonate filtrate reducer for drilling fluid.

[0023] Example 3 A preparation method of a sulfonate filtrate reducer for drilling fluid, comprising the following steps: (1) Add 28.5 g of dehydroabietylamine to 300 mL of N,N-dimethylformamide, add 14.0 g of epoxybutene and 0.5 g of zinc, and react at 70 °C for 4 h to obtain a modifier; (2) Add 40 g of 2-acrylamido-2-methylpropanesulfonic acid to 120 g of deionized water, adjust the pH to 7 with 40% sodium hydroxide, then add 10 g of sodium styrenesulfonate and 20 g of acrylamide, and stir at 30 °C for 20 min to obtain an aqueous phase; (3) Add 10 g of nonylphenol polyoxyethylene ether to the aqueous phase and stir at 30 °C for 20 min to obtain a pre-emulsion; (4) Under nitrogen conditions, add 1.0 g of sodium bisulfite, 0.5 g of potassium persulfate and 10 g of the modifier to the pre-emulsion, react at 30 °C for 60 min, then raise the temperature to 70 °C and react for 2 h, and dry the product at 65 °C and pulverize it to obtain a sulfonate filtrate reducer for drilling fluid.

[0024] Comparative Example 1 A preparation method of a sulfonate filtrate reducer for drilling fluid, comprising the following steps: (2) Add 45 g of 2-acrylamido-2-methylpropanesulfonic acid to 130 g of deionized water, adjust the pH to 8 with 40% sodium hydroxide, then add 15 g of sodium styrenesulfonate and 25 g of acrylamide, and stir at 25 °C for 30 min to obtain an aqueous phase; (2) Add 10 g of fatty alcohol polyoxyethylene ether to the aqueous phase and stir for 20 min at 25 °C to obtain a pre-emulsion. (3) Under nitrogen conditions, add 0.5 g of sodium bisulfite, 1 g of potassium persulfate, and 20 g of crosslinking agent N,N`-methylenebisacrylamide to the pre-emulsion. After reacting at 35 °C for 40 min, raise the temperature to 80 °C and react for 3 h. Then dry the product at 65 °C and pulverize it to obtain a sulfonate filtrate reducer for drilling fluid.

[0025] White oil-based drilling fluid formula: 240 mL of No. 5 white oil, 6 g of organophilic clay, 60 mL of 20% CaCl2 solution, 12 g of main emulsifier, 4 g of auxiliary emulsifier, and 12 g of filtrate reducer. Test the samples prepared in the examples. According to GB / T16783.2-2012 Petroleum and natural gas industries - Drilling fluids - Field testing - Part 2: Oil-based drilling fluids standard, measure the filtration loss at room temperature before aging and after aging at 150 °C, 200 °C, and 230 °C for 16 h, and measure the high-temperature and high-pressure filtration loss at 150 °C and 3.5 MPa.

[0026] Table 1 Performance indicators of different examples and comparative examples

[0027] As can be seen from Table 1, in this application, a modifier is prepared using the natural product derivative dehydroabietylamine as a raw material to improve the temperature resistance of the filtrate reducer and reduce the filtration loss. The obtained modifier molecule contains a rigid ring structure, which can enhance its heat resistance. In addition, the modifier molecule also contains two double bond structures, which can not only polymerize with other components but also act as a crosslinking agent to further promote the polymerization between compounds, thereby enhancing the temperature resistance.

[0028] Obviously, the above examples are only for clear illustration and not a limitation of the implementation mode. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation modes here. And the obvious changes or variations derived therefrom are still within the protection scope of this invention.

Claims

1. A preparation method of a sulfonate filtrate reducer for drilling fluid, characterized in that, It includes the following steps: (1) Add dehydroabietylamine into a solvent, then add epoxybutene and a catalyst, and react to obtain a modifier; (2) Add 2-acrylamido-2-methylpropanesulfonic acid into deionized water, adjust the pH to 7-9, then add sodium styrenesulfonate and acrylamide, and stir to obtain an aqueous phase; (3) Add an emulsifier into the aqueous phase and stir to obtain a pre-emulsion; (4) Under nitrogen conditions, add an initiator and a modifier into the pre-emulsion, react at 30-40 °C for 30-60 min, then raise the temperature to 70-90 °C and react for 2-4 h to obtain a sulfonate filtrate reducer for drilling fluid; The catalyst is at least one of zinc or nano-zinc oxide; The emulsifier is at least one of nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether; The initiator is a composite initiator of potassium persulfate and sodium bisulfite; The mass ratio of 2-acrylamido-2-methylpropanesulfonic acid, sodium styrenesulfonate, acrylamide and the modifier is 40-50:10-20:20-30:10-20.

2. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that, The solvent in step (1) is N,N-dimethylformamide.

3. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 2, characterized in that, In step (1), the molar ratio of dehydroabietylamine to epoxybutene is 1:2-1:3, the reaction temperature is 70-100 °C, and the reaction time is 4-8 h.

4. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that, The mass ratio of dehydroabietylamine to the catalyst is 100:1-2, the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to the emulsifier is 4-5:1, and the mass ratio of the modifier to the initiator is 6-15:

1.

5. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that, The mass ratio of potassium persulfate to sodium bisulfite is 1:2-2:

1.

6. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that The mass ratio of the emulsifier to deionized water is 10:120-150.

7. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that, In step (2), the stirring time is 20-30 min and the temperature is 25-30 °C.

8. The preparation method of the sulfonate filtrate reducer for drilling fluid according to claim 1, characterized in that, In step (3), the stirring time is 10-20 min and the temperature is 25-30 °C.

9. A sulfonate filtrate reducer for drilling fluid, characterized in that, It is prepared by using the preparation method described in any one of claims 1-8.

Images