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Polymer for high-temperature cement retarder and preparation method thereof

A technology of high-temperature cement and retarder, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of inapplicability and retarder not meeting the requirements of use, and achieve good thermal stability and retardation performance, Good retarding effect and simple process

Inactive Publication Date: 2010-10-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this retarder cannot meet the requirements for the circulation temperature above 180°C, and is not suitable for deep wells and ultra-deep wells with high bottom-hole temperatures.

Method used

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  • Polymer for high-temperature cement retarder and preparation method thereof

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preparation example Construction

[0024] The invention provides a kind of preparation method for the polymer of high-temperature cement retarder, comprising:

[0025] An organic solvent and a surfactant are mixed to obtain an oil phase solution, and the surfactant is a mixture of fatty acid sorbitan and polysorbate;

[0026] 2-acrylamide-2-methylpropanesulfonic acid, styrenesulfonic acid and itaconic acid are dissolved in water to obtain an aqueous phase solution, the 2-acrylamide-2-methylpropanesulfonic acid, styrenesulfonic acid The molar ratio to itaconic acid is 6-8: 0.1-1.5: 1.5-3;

[0027] mixing the aqueous phase solution with the oil phase solution, and obtaining a reaction solution after deoxygenation;

[0028] An initiator is added to the reaction solution, and the temperature is raised to 20° C. to 80° C. to carry out a polymerization reaction to obtain a polymer.

[0029] The invention adopts an inverse emulsion copolymerization method to prepare polymers for high-temperature cement retarders, wh...

Embodiment 1

[0044] At 30°C, add 50g of a surfactant mixture of Tween 60 and Span 80 and 250g of cyclohexane into a four-necked reaction flask, and stir and emulsify at 3000rmp / min for 4h to obtain an oil phase. The HLB value of the surfactant mixture is is 9.2;

[0045] Dissolve AMPS, styrene-based sulfonic acid and IA in deionized water at a molar ratio of 6.5: 1.5: 2.0 to prepare 1000 g of monomer aqueous solution, wherein the total amount of AMPS, styrene-based sulfonic acid and IA accounts for 1% of the aqueous solution weight 50%; add dropwise a NaOH solution with a mass concentration of 30% in the monomer aqueous solution, adjust the pH to 6.0, and obtain an aqueous phase;

[0046] At 40°C and a stirring speed of 500rmp / min, the water phase was slowly added dropwise to the oil phase, stirred for 0.5h, and N 2 , and then add 0.4g potassium persulfate initiator, heat up to 50°C for polymerization reaction, react for 6h, add acetone to precipitate, and obtain a polymer.

[0047] The ...

Embodiment 2

[0050] At 20°C, add 40g of the surfactant mixture of Tween 60 and Span 60 and 600g of No. 10 white oil into the four-necked reaction flask, and stir and emulsify at 5000rmp / min for 0.5h to obtain the oil phase, wherein the HLB of the surfactant mixture Value is 8.0;

[0051] Dissolve AMPS, styrene-based sulfonic acid and IA in deionized water according to the molar ratio of 7.3:0.2:2.5, and prepare 300g monomer aqueous solution, wherein, the total amount of AMPS, styrene-based sulfonic acid and IA accounts for the weight of the aqueous solution 50%; add dropwise a NaOH solution with a mass concentration of 30% in the monomer aqueous solution, adjust the pH to 6.5, and obtain an aqueous phase;

[0052] At 20°C and a stirring speed of 200rmp / min, the water phase was slowly added dropwise to the oil phase, stirred for 0.5h, and N 2 , and then add 0.15g of 2,2-azobis(2-imidazolinylpropane) dihydrochloride initiator, heat up to 30°C for polymerization, react for 24h, add acetone t...

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Abstract

The invention provides a method for preparing a polymer for a high-temperature cement retarder. The method comprises the following steps of: mixing an organic solvent and a surfactant to obtain oil phase solution, wherein the surfactant is a mixture of fatty acid sorbitan and polysorbate; dissolving 2-acrylamide-2-methylpropanesulfonic acid, styrene sulfonic acid and itaconic acid in deionized water to obtain aqueous phase solution, wherein the molar ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the styrene sulfonic acid to the itaconic acid is 6-8:0.1-1.5:1.5-3; mixing the aqueous phase solution and the oil phase solution, and deoxygenizing to obtain reaction solution; and adding an initiator into the reaction solution, and raising the temperature to between 20 and 80 DEG C for polymerization so as to obtain the polymer. The invention also provides the polymer for the high-temperature cement retarder. The polymer provided by the invention has the advantages of good thermal stability and setting retardancy.

Description

technical field [0001] The invention relates to the technical field of high-molecular polymers, in particular to a polymer used for high-temperature cement retarders and a preparation method thereof. Background technique [0002] With the deepening of oilfield exploration and development technology and the development of drilling technology, the depth of oil and gas wells continues to increase, and the temperature at the bottom of the well is also getting higher and higher. With the increase of the bottom hole temperature, the solidification speed of cement will also be accelerated, which requires the cement retarder to slow down the solidification speed of cement slurry at a higher circulating temperature and prolong the thickening time of cement slurry. [0003] The cement retarders commonly used in the prior art are mostly polymer materials such as lignosulfonate and glucose, but these retarders can only function when the circulation temperature is about 90°C. Adding ret...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F212/14C08F222/02C08F2/32C04B24/20C09K8/467C04B103/22
Inventor 徐昆王丕新张文德谭颖李文波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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