Tackifier copolymerization associate used for drilling fluid and preparation method of tackifier copolymerization associate

A technology of associates and viscosifiers, applied in the field of drilling fluid polymers and their preparation, can solve the problem of no obvious improvement in salt and calcium resistance, and achieve high temperature and salt resistance

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101955564A, CN103113518A, and CN102127401A disclose high-temperature-resistant tackifiers. The high-temperature-resistant performance of the tackifier has been significantly improved, and the temperature resistance can reach

Method used

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  • Tackifier copolymerization associate used for drilling fluid and preparation method of tackifier copolymerization associate
  • Tackifier copolymerization associate used for drilling fluid and preparation method of tackifier copolymerization associate
  • Tackifier copolymerization associate used for drilling fluid and preparation method of tackifier copolymerization associate

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0067] Example 1

[0068] Weigh 170g MAPS, 140g DMAM and 100g corn starch for later use, then weigh 6730g deionized water and 1758g NaCl to prepare NaCl solution, and divide the solution into two equal parts. Add corn starch to a part of NaCl solution and gelatinize at 80℃ for 30min, then pass in N 2 After 30 minutes, 3.7g potassium persulfate was added, and then DMAM and MAPS were added to the remaining part of the NaCl solution. After dissolution, they were transferred to the gelatinized starch and reacted at 65°C for 2 hours to obtain the intermediate product. Then 140 g of cationic polyamine 1 was dissolved in 300 g of deionized water to prepare a cationic polyamine solution, and then the cationic polyamine solution was added to the intermediate product, mixed uniformly, and the temperature was raised to 75° C., and the reaction was continued for 4 hours. The precipitate is washed with acetone, and the precipitate is dried at 70° C. for 12 hours and then pulverized to obtain ...

Example Embodiment

[0069] Example 2

[0070] Weigh 150g MAPS, 112g DMAM and 100g potato starch for use. Weigh 2870g deionized water and 330g CaCl respectively 2 Formulated into CaCl 2 Solution, divide the solution into two parts with a volume ratio of 6:4. Add potato starch to the more CaCl 2 The solution was gelatinized at 70℃ for 30min, and then N was passed through 2 Add 1.7g sodium persulfate after 30min, then add DMAM and MAPS to the remaining little CaCl 2 After the solution is dissolved, it is transferred to a gelatinized starch reactor and reacted at 70°C for 1.5 hours to obtain an intermediate product. Then, 30 g of cationic polyamine 2 was dissolved in 100 g of deionized water to prepare a cationic polyamine solution, and then the cationic polyamine solution was added to the intermediate product, mixed uniformly, and the temperature was raised to 80° C., and the reaction was continued for 3 hours. Wash with acetone to obtain a precipitate. The precipitate was dried at 80°C for 12 hours ...

Example Embodiment

[0071] Example 3

[0072] Weigh 130g MAPS, 168g DMAM and 100g potato starch for use. Weigh 1785g deionized water and 105g AlCl respectively 3 Formulated into AlCl 3 Solution, divide the solution into two equal parts. Add potato starch to a part of AlCl 3 The solution is gelatinized at 60℃ for 30min, and then N 2 Add 5.3g ammonium persulfate after 30min, then add DMAM and MAPS to the remaining part of AlCl 3 After the solution is dissolved, it is transferred to a gelatinized starch reactor and reacted at 60°C for 2h to obtain an intermediate product. Then 60 g of cationic polyamine 3 was dissolved in 200 g of deionized water to prepare a cationic polyamine solution, and then the cationic polyamine solution was added to the intermediate product, mixed uniformly, and the temperature was raised to 70° C., and the reaction was continued for 4 hours. Wash with acetone to obtain a precipitate. The precipitate was dried at 80°C for 12 hours and then crushed to obtain a grafted starch t...

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Abstract

The invention discloses a tackifier copolymerization associate used for a drilling fluid and a preparation method of the tackifier copolymerization associate. The copolymerization associate comprises a constitutional unit A, a constitutional unit B, a constitutional unit C and a constitutional unit D. The constitutional unit A is N, N-dimethylacrylamide, the constitutional unit B is N-methyl diallyl propylsulfonate (MAPS) which is an amphoteric ionic monomer, the constitutional unit C is an ionic associate of the constitutional unit B and cationic polyamine, and the constitutional unit D is starch. Based on the total amount of the copolymerization associate, the copolymerization associate comprises 6-45% by weight of N, N-dimethylacrylamide, 5-35% by weight of the N-methyl diallyl propylsulfonate which is an amphoteric ionic monomer, 2-30% by weight of the cationic polyamine, and 5-35% by weight of starch. A tackifier obtained through the preparation method can resist temperature as high as 180 DEG C, can resist a saturated NaCl solution, and resist a CaCl2 solution with the concentration being 20%. The tackifier is excellent shale inhibition and filtrate reduction.

Description

technical field [0001] The invention relates to a polymer used in drilling fluid in the oil drilling process and a preparation method thereof, in particular to a high-temperature-resistant and calcium-resistant grafted starch tackifier for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling process, in order to ensure that the drilling fluid has a high viscosity and good rheology under low solid phase, it is usually necessary to add a viscosifier to increase the viscosity of the drilling fluid. Drilling fluid viscosifiers are all water-soluble high molecular polymers with long molecular chains. In addition to the viscosifying effect, viscosifiers often also serve as shale inhibitors (coating agents), fluid loss reducers and flow control agents. type improver, etc. Therefore, the use of viscosifiers is often beneficial to improving the rheological properties of drilling fluids, and is also beneficial to the stability of wellbore...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F228/02C08F220/54C08G73/02C09K8/588
Inventor 田丹杨超
Owner CHINA PETROLEUM & CHEM CORP
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