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A technology of polyacrylamide and aldehyde hydrogen, which is applied in the field of self-crosslinking polyacrylamide, can solve the problems of complex construction process, high construction cost, and many equipments, and achieve good profile control effect, convenient construction and safe use Effect
Inactive Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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[0002] In oil extraction, polyacrylamide is used as a profile control agent, generally polyacrylamide and cross-linking agent are used together to play a role in polymer injection and profile control in oil exploration formations, but it also has the following disadvantages Or disadvantages: ① due to the common use of polyacrylamide and cross-linking agent, the preparation is cumbersome and the construction process is more complicated; ② more equipment is used, more construction personnel are used, and the construction cost is high; ③ polyacrylamide and cross-linking agent are injected into the well, Due to the chromatographic effect, the two products cannot migrate synchronously, and the gelation is unstable or even non-gelling, which fails to achieve the purpose of profile control, resulting in waste of manpower, material resources, and financial resources; ④The polymer has inaccessible pore volume in the formation, reducing The swept volume of polymer flooding is reduced, resulting in poor effects of polymer injection and profile control
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Embodiment 1
[0022] Add 260Kg of acrylamide, 20Kg of N-methylolphenol carbonyl acrylamide, 20Kg of N-methylolacrylamide, and 700Kg of deionized water into the reaction kettle. Stir with nitrogen gas for 25 minutes, and then add an initiator. The initiator has a mass ratio of 1: 1 Potassium persulfate: sodium sulfite, initiate polymerization at 25°C for 6 hours, then react at 40°C for 55 minutes, dry and granulate to obtain self-crosslinked polyacrylamide reacted with aldehyde hydrogen.
[0023] In the reaction, R1 and R2 are mutually reactive groups. R1 is The terminal group, R2 is end group. The ratio of R1 to R2 is 1:1. The content of the monomers of R1 and R2 in the polymer was 1% by mass.
[0024]
Embodiment 2
[0026] Add 250Kg acrylamide, 25Kg N-methylol phenol carbonyl acrylamide, 25Kg N-methylol acrylamide, 750Kg deionized water into the reaction kettle, blow nitrogen gas for 30 minutes and stir well, then add initiator, the initiator is mass ratio 1: 1 Potassium persulfate: sodium sulfite, initiate polymerization reaction at 30°C for 7 hours, then react at 50°C for 60 minutes, dry and granulate to obtain self-crosslinked polyacrylamide reacted with aldehyde hydrogen.
[0027] In the reaction, R1 and R2 are mutually reactive groups. R1 is The terminal group, R2 is containing The terminal group; the ratio of R1 to R2 is 1:1. The content of monomers containing R1 and R2 in the polymer was 25% by mass.
Embodiment 3
[0029] Add 270Kg of acrylamide, 30Kg of N-methylol phenol carbonyl acrylamide, 30Kg of N-methylol acrylamide, and 800Kg of deionized water into the reaction kettle. Stir for 35 minutes with nitrogen gas, and then add the initiator. The initiator has a mass ratio of 1: 1 Potassium persulfate: sodium sulfite, initiate polymerization reaction at 30°C for 8 hours, then react at 60°C for 65 minutes, dry and granulate to obtain self-crosslinked polyacrylamide reacted with aldehyde hydrogen.
[0030] In the reaction, R1 and R2 are mutually reactive groups. R1 The terminal group, R2 is containing end group. The ratio of R1 to R2 is 1:1. The content of monomers containing R1 and R2 in the polymer is 50% by mass.
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Abstract
The invention provides an aldehydic hydrogen-based self-crosslinking polyacrylamide which is prepared through aqueous solution polymerization or emulsion polymerization. The aldehydic hydrogen-based self-crosslinking polyacrylamide has a structural formula as described in the specification; in the formula, R1 is a group containing aldehydic hydrogen, a group with its end group being phenol or CHO and R2 is a group with its end group being phenol, a group containing aldehydic hydrogen or CHO. A preparation method for the aldehydic hydrogen-based self-crosslinking polyacrylamide comprises the following steps: adding acrylamide, N-hydroxymethyl-phenol-carbonyl acrylamide, N-hydroxymethyl acrylamide and deionized water into a reaction kettle, blowing nitrogen gas into the kettle for 25 to 35 minutes, carrying out uniform stirring, adding an initiator, carrying out initiated polymerization at a temperature of 25 to 30 DEG C for 6 to 8 hours, then carrying out a reaction at a temperature of 40 to 60 DEG C for 55 to 65 minutes and carrying out drying and granulation so as to obtain the aldehydic hydrogen-based self-crosslinking polyacrylamide. The aldehydic hydrogen-based self-crosslinking polyacrylamide provided in the invention has the characteristics of a single product, convenient construction, low cost, stable gelation, controllable gelation time, a good profile control effect, capacity of self-crosslinking, safety and convenience in usage, etc., and is widely used in the process of polymer injection in oil exploration.
Description
technical field [0001] The invention relates to high molecular polymer polyacrylamide, in particular to a self-crosslinking polyacrylamide reacted with aldehyde hydrogen. Background technique [0002] In oil extraction, polyacrylamide is used as a profile control agent, generally polyacrylamide and cross-linking agent are used together to play a role in polymer injection and profile control in oil exploration formations, but it also has the following disadvantages Or disadvantages: ① due to the common use of polyacrylamide and cross-linking agent, the preparation is cumbersome and the construction process is more complicated; ② more equipment is used, more construction personnel are used, and the construction cost is high; ③ polyacrylamide and cross-linking agent are injected into the well, Due to the chromatographic effect, the two products cannot migrate synchronously, and the gelation is unstable or even non-gelling, which fails to achieve the purpose of profile control, ...
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