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Copolymer for drilling fluid tackifier and preparation method thereof

The technology of an associate and a tackifier is applied in the field of polymers for drilling fluids and its preparation, which can solve the problems of no obvious improvement in salt resistance and calcium resistance, and achieve the effect of high temperature and salt resistance.

Active Publication Date: 2019-01-25
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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  • Copolymer for drilling fluid tackifier and preparation method thereof
  • Copolymer for drilling fluid tackifier and preparation method thereof
  • Copolymer for drilling fluid tackifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Weigh 170g of MAPS, 140g of DMAM and 100g of cornstarch for later use, then weigh 6730g of deionized water and 1758g of NaCl to prepare NaCl solution, and divide the solution 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 DMAM and MAPS were added to the remaining NaCl solution, dissolved and then transferred to gelatinized starch, and reacted at 65°C for 2 h to obtain an 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 evenly, and the temperature was raised to 75°C at the same time, and the reaction was continued for 4 hours. A precipitate was obtained by washing with acetone, and the precipitate was dried at 70° C. for 12 hours and then pulverized to obtain a grafted starch thickener...

Embodiment 2

[0071] Weigh 150g MAPS, 112g DMAM and 100g potato starch respectively for later use. Then weigh 2870g 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 DMAM and MAPS 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, 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 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 pul...

Embodiment 3

[0073] Weigh 130g MAPS, 168g DMAM 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 After 30min, add 5.3g ammonium persulfate, then add DMAM and MAPS to the remaining 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 pulveri...

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