Temperature-resistant thickening agent copolymerization association compound and preparation method thereof

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 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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  • Temperature-resistant thickening agent copolymerization association compound and preparation method thereof
  • Temperature-resistant thickening agent copolymerization association compound and preparation method thereof
  • Temperature-resistant thickening agent copolymerization association compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Weigh 440g NaCl and dissolve it in 1650g deionized water; then weigh 28g DMAPS and 90g DMAM respectively and dissolve it in NaCl solution; 2 Deoxygenation was performed for 1 hour, while the temperature was raised to 55° C., kept for 30 minutes, then 0.45 g of ammonium persulfate was added, and an intermediate product was obtained after 2 hours of reaction. Then, 20 g of cationic polyamine 1 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 evenly, and the temperature was raised to 65°C at the same time, and the reaction was continued for 4 hours. A precipitate was obtained by precipitation with acetone. After drying at 110°C for 24 hours, it was pulverized to obtain DMAPS / DMAM tackifier.

Embodiment 2

[0064] Weigh 112g CaCl 2 Dissolve in 910g deionized water; weigh 56g DMAPS and 78g DMAM respectively in CaCl 2 in the solution; fully dissolved and then transferred to the reactor, and N 2 Deoxygenation was performed for 1 hour, while the temperature was raised to 60° C., kept for 30 minutes, then 0.45 g of sodium persulfate was added, and the reaction was carried out for 1 hour to obtain an intermediate product. Then, 20 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 evenly, and the temperature was raised to 70° C., and the reaction was continued for 3 hours. A precipitate was obtained by precipitation with acetone. After drying at 120°C for 24 hours, it was pulverized to obtain DMAPS / DMAM tackifier.

Embodiment 3

[0066] Weigh 40g AlCl 3 Dissolve in 660g deionized water; then weigh 84g DMAPS and 70g DMAM in AlCl 3 in the solution; fully dissolved and then transferred to the reactor, and N 2 Deoxygenation for 0.5h, while raising the temperature to 60°C, keeping for 30min, adding 0.54g of potassium persulfate, and reacting for 1.5h to obtain an intermediate product. Then, 25 g of cationic polyamine 3 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 evenly, and the temperature was raised to 65°C at the same time, and the reaction was continued for 4 hours. A precipitate was obtained by precipitation with acetone. After drying at 120°C for 16 hours, it was pulverized to obtain DMAPS / DMAM tackifier.

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Abstract

The invention discloses a temperature-resistant thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is N,N-dimethylacrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), and the structural unit C is an ion association body of the structural unit B and cationic polyamine; and based on the total amount of the copolymerization association compound, the content of the N,N-dimethylacrylamide is 10-75% by weight, preferably 30-65% by weight, the total content of the amphoteric monomer is 8-55% by weight, preferably 20-60% by weight, and the content of the cationic polyamine is 1-50% by weight, preferably 3-40% by weight. 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 viscosifier used in 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 walls. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/38C08F8/44C09K8/035
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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