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High temperature and salt resistant coating agent for drilling fluid and preparation method thereof
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A high temperature resistance and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of coating agent failure, poor temperature resistance, etc., to improve the coating effect and strong salt resistance , strong coating effect
Active Publication Date: 2017-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Abstract
Description
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Problems solved by technology
But at present, most coating agents have poor temperature resistance, especially when the temperature reaches 200°C, the coating agent will fail
Method used
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Embodiment 1
[0018] 1) Add 100 parts of water to the reactor, add 10 parts of acrylic acid, 10 parts of 2-acrylamide-2 methylpropanesulfonic acid, 2 parts of sodium p-styrenesulfonate, 0.05 parts of vinyl triethyl Oxysilane and 0.2 parts of aluminum chloride are added to the reaction kettle, and then stirred and dissolved to obtain a mixed aqueous solution;
[0019] 2) Adjust the pH of the aqueous solution in step 1 to 8, and then pass nitrogen gas for 10 minutes;
[0020] 3) Add 0.2 parts of ammoniumpersulfate to the reaction kettle, and react for 7 hours at 60°C to prepare the glue;
[0021] 4) Dry the obtained glue solution in an oven at a temperature of 90° C. for 12 hours, and pulverize it with a pulverizer after drying to obtain a high-temperature and salt-resistant coating agent for drilling fluid.
Embodiment 2
[0023] 1) Add 120 parts of water to the reactor, add 15 parts of acrylic acid, 12 parts of 2-acrylamide-2 methylpropanesulfonic acid, 5 parts of sodium p-styrenesulfonate, 0.1 part of isobutyl tri Ethoxysilane and 0.5 parts of aluminum chloride are added to the reaction kettle, then stirred and dissolved to obtain a mixed aqueous solution;
[0024] 2) Adjust the pH of the aqueous solution in step 1 to 12, and then pass nitrogen gas for 20 minutes;
[0025] 3) Add 0.15 parts by weight of ammoniumpersulfate and 0.1 parts by weight of sodium bisulfite to the reaction kettle, and react for 2 hours at 20°C to prepare the glue;
[0026] 4) Dry the obtained glue solution in an oven at a temperature of 90° C. for 12 hours, and pulverize it with a pulverizer after drying to obtain a high-temperature and salt-resistant coating agent for drilling fluid.
Embodiment 3
[0028] 1) Add 110 parts of water to the reactor, 12 parts of acrylic acid, 12 parts of 2-acrylamide-2 methylpropanesulfonic acid, 4 parts of sodium p-styrenesulfonate, 0.03 parts of vinyl triethyl Oxysilane, 0.03 parts of isobutyltriethoxysilane and 0.3 parts of aluminum chloride are added to the reaction kettle, and then stirred and dissolved to obtain a mixed aqueous solution;
[0029] 2) Adjust the pH of the aqueous solution in step 1 to 11, and then pass nitrogen gas for 15 minutes;
[0030] 3) Add 0.2 parts by weight of ammoniumpersulfate and 0.2 parts by weight of sodium bisulfite to the reactor, and react for 4 hours at 50°C;
[0031] 4) Dry the prepared glue solution in an oven at a temperature of 90°C for 12 hours, and pulverize it with a pulverizer after drying to obtain a high-temperature and salt-resistant coating agent for drilling fluid.
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Abstract
The invention discloses a high temperature and salt resistance encapsulating agent for drilling fluid and a preparation method of the high temperature and salt resistance encapsulating agent. The high temperature and salt resistance encapsulating agent is a multipolymer formed by copolymerizing 10-15 parts of crylic acid, 10-12 parts of 2-acrylamide-2-methyl propyl sulfonic acid, 2-5 parts of sodium p-styrenesulfonate, 0.05-0.1 part of a silanecoupling agent and 0.2-0.5 part of aluminiumchloride by weight under the effect of an initiator. The encapsulating agent disclosed by the invention contains the structures of sulfonic acid groups, benzene rings and the like, and has excellent high temperature and salt resistance. Moreover, trivalent aluminum ions are introduced in the encapsulating agent, and quick adsorption on clay surface can be realized, so that the encapsulating effect of the encapsulating agent is improved. The high temperature and salt resistance encapsulating agent for the drilling fluid disclosed by the invention can be applied to sodiumchloridedrilling fluid systems, potassiumchloride drilling fluid systems, organic salt drilling fluid systems and the like.
Description
technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a high-temperature and salt-resistant coating agent for drilling fluid and a preparation method thereof. Background technique [0002] With the continuous deepening of oil and gas drilling, the drilling depth is getting deeper and deeper, and the formation temperature is getting higher and higher. When the vertical depth exceeds 5000m, the formation temperature will be close to 200℃; on the other hand, the formation encountered by drilling is becoming more and more complex. In particular, there are more and more highly water-sensitive mud shale formations, salt rock formations, and salt-gypsum formations. Therefore, the difficulty encountered in drilling is increasing, and higher requirements are put forward for the performance of drilling fluid, especially the temperature resistance and inhibition. In order to effectively solve the problem of wellbore stability during deep w...
Claims
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Application Information
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