Grafted starch thickening agent copolymerization association compound and preparation method thereof

A technology of grafted starch and associated compounds, which is applied in the field of drilling fluid polymers and its 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 above 200°C; the salt-resistant and calcium-resistant properties are not mentioned, but from the monomers used and the preparation method It is speculated that there is no significant improvement in salt and calcium resistance

Method used

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  • Grafted starch thickening agent copolymerization association compound and preparation method thereof
  • Grafted starch thickening agent copolymerization association compound and preparation method thereof
  • Grafted starch thickening agent copolymerization association compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Weigh 170g DMAPS, 100g AM and 100g corn starch respectively for later use. Then, 6830 g of deionized water and 1758 g of NaCl were weighed to prepare NaCl solution, and the solution was equally divided into two parts. Add cornstarch to a part of NaCl solution and gelatinize at 80°C for 30min, 2 After 30 min, 3.7 g of potassium persulfate was added, and then AM and DMAPS were added to another part of NaCl solution to dissolve, then transferred to a gelatinized starch reactor, and reacted at 65 ° C for 2 h to obtain an intermediate product. Then, 70 g of cationic polyamine 1 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 evenly, and the temperature was raised to 75°C at the same time, and the reaction was continued for 4 hours. The precipitate was washed with acetone. The precipitate was dried at 70°C for 12 hours and then pulverized to obtain a gra...

Embodiment 2

[0069] Weigh 150g DMAPS, 80g AM and 100g potato starch respectively for later use. Then weigh 2770g deionized water and 330g CaCl 2 Formulated as CaCl 2 solution, the solution was divided into two parts with a volume ratio of 6:4. Add potato starch to one more part of CaCl 2 The solution was gelatinized at 70°C for 30min, and N 2 After 30min, add 1.7g sodium persulfate, then add AM and DMAPS to the remaining CaCl 2 After the solution was dissolved, it was transferred to a gelatinized starch reactor, and an intermediate product was obtained after reacting at 70° C. for 1.5 h. Then, 60 g of cationic polyamine 2 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 evenly, and the temperature was raised to 80° C., and the reaction was continued for 3 hours. The precipitate was washed with acetone. The precipitate was dried at 80°C for 12 hours and then pulveri...

Embodiment 3

[0071] Weigh 130g DMAPS, 120g AM and 100g potato starch respectively for later use. Then weigh 1785g deionized water and 105g AlCl 3 Formulated as AlCl 3 solution, divide the solution into two equal parts. Add potato starch to a portion of AlCl 3 The solution was gelatinized at 60°C for 30min, and N 2 Add 5.3g ammonium persulfate after 30min, then add AM and DMAPS to another part of AlCl 3 After the solution was dissolved, it was transferred to a gelatinized starch reactor, and the intermediate product was obtained after reacting for 2 hours at 60°C. 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 evenly, and the temperature was raised to 70°C at the same time, and the reaction was continued for 4 hours. The precipitate was washed with acetone. The precipitate was dried at 80°C for 12 hours and then pulverized to obt...

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Abstract

The invention discloses a grafted starch thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B, a structural unit C and a structural unit D, the structural unit A is acrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), the structural unit C is an ion association body of the structural unit B and cationic polyamine, and the structural unit D is starch; and based on the total amount of the copolymerization association compound, the content of the acrylamide is 6-45wt%, the total content of the amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate is 5-35wt%, the content of the cationic polyamine is 2-30wt%, and the content of the starch is 5-35wt%. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G73/02C08F251/00C09K8/035
CPCC08F251/00C08G73/024C08G81/024C09K8/035C08F220/387
Inventor 杨超张志智孙潇磊鲁娇尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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