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Method for synthesizing suspensible and deformable polyacrylamide

A technology for polyacrylamide and a synthesis method, which is applied in the field of suspendable deformable polyacrylamide synthesis, can solve the problems of easy plugging of near-well formations, poor elastic deformation ability, increased injection procedures, etc., so as to be suitable for large-scale industrial production, prevent Subsidence, the effect of improving the transport coefficient

Active Publication Date: 2007-10-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Petroleum is an important strategic resource of the country. There is still a considerable amount of recoverable oil in the formation after the secondary and tertiary oil recovery. The method of injecting bulky granular polyacrylamide to adjust the water absorption profile of the formation to increase the crude oil production has been applied, but in In practical application, many problems are encountered: surface active agents need to be added to prevent the sedimentation of granular polymers when preparing such polymers, and the addition of sodium soil additives during injection causes wear and tear on injection equipment and formation pollution. Low water swelling rate results in poor elastic deformation ability, not only poor profile control effect, but also easy to block formation near wellbore
The production of volume-expanding granular polyacrylamide at home and abroad mainly adopts the process of acrylamide polymerization hydrolysis or acrylamide and acrylic acid copolymerization, and adds crosslinking agent and sodium soil additives to it. The product has low water expansion rate and poor elastic deformation. Difficult to enter the deep part of the oil layer, easy to block the wellhead or formation near the well
Moreover, it is necessary to prepare additional carrier liquid during injection, which increases the injection process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare 1000g of reaction solution, 510g of acrylamide aqueous solution with a concentration of 30%, 10g of functional monomer 3,5-diacryloyloxyethyl-benzenesulfonic acid, 0.008g of potassium persulfate, 0.008g of sodium bisulfite, and 480g of deionized water .

[0026] The initial temperature of the reaction was 10° C., the catalyst was added after blowing nitrogen for 30 minutes, and after continuing to blow nitrogen for 2 minutes, the blowing of nitrogen was stopped and the reactor was sealed. After 3 hours, the reaction is over, take out the colloid, cut the colloid into small pieces with scissors and then dry it in an oven at 60°C for 10 hours. The sample in the lower middle is ready for use.

[0027] Table 1 1000g small test product quality

[0028] sample name

Embodiment 2

[0030] Prepare 12 tons of reaction solution, 6120 kg of acrylamide aqueous solution with a concentration of 20%, 120 kg of functional monomer 3,5-diacryloyloxyethyl-benzenesulfonic acid, 0.096 kg of potassium persulfate, 0.096 kg of sodium bisulfite, and remove 5,760 kg of ionized water, the initial reaction temperature is 0°C, blow nitrogen for 20 minutes, add the catalyst, continue to blow nitrogen for 5 minutes, stop blowing nitrogen and close the reactor, after 3 hours after the reaction is over, pour out the colloid, and pre-grind the colloid Grind into small pieces, and then granulate through a granulator. The size of the ground colloid particles is 1mm-20mm, and dry in a fluidized bed. The feed rate of the dryer is kept at about 3t / h, and the bed height is 15-20cm. The drying temperature of the front and rear sections of the dryer is set at 50-55°C and 60-65°C, and the finished product is packaged after drying.

[0031] Product batch

Embodiment 3

[0033] Prepare reaction solution, 25% of acrylamide, 4% of 3,5-diacryloyloxyethyl-benzenesulfonic acid, add deionized water to make 100%, potassium persulfate 10ppm, sodium bisulfite 5ppm, reaction initial temperature at 5°C, blow nitrogen for 50 minutes, add the catalyst, continue blowing nitrogen for 5 minutes, stop blowing nitrogen and close the reactor, after 3 hours after the reaction is over, pour out the colloid, grind the colloid into small pieces in the pre-grinding, and then pass through the Granulator granulation, grinding colloidal particles with a size of 1mm-20mm, drying in a fluidized bed, the feed rate of the dryer is kept at about 3t / h, the bed height is 15-20cm, and the drying temperature of the front and rear sections of the dryer is set at 50-55°C, 60-65°C, after drying, pack the finished product.

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Abstract

This invention relates to a method for synthesizing suspension-deformable polyacrylamide that can be used to adjust the stratum injection profile to increase crude oil productivity after second and third oil production. The method comprises: mixing acrylamide 20-30%, 3,5-diacryloyloxyethyl-benzenesulfonic acid 2-8%, and desalted water as balance, adding catalysts potassium persulfate 5-10 ppm and sodium bisulfate 5-10 ppm, and polymerizing at 0-15 deg.C to obtain polyacrylamide. Polyacrylamide thus synthesized has high salt resistance, which is not limited by the mineralization degree of speed are adjustable according to the spot conditions. The colloid particles have certain solubility and viscosity in aqueous solution, thus can be uniformly suspended in the solution without any volume change when contacting oil. When absorbing water, the colloid particles expand and turn soft. Under the action of outside force, the colloid particles can deform, and the deformation is reversible. The polyacrylamide can change the underground pressure field and flow field driven by water flow, thus can adjust the stratum injection profile. The polyacrylamide is suitable for bulk polymerization in kettle.

Description

Technical field: [0001] The invention relates to a synthesis method of suspendable deformable polyacrylamide, which is used for adjusting the stratum water absorption profile after secondary and tertiary oil recovery in an oil field to increase crude oil output, and is suitable for large-block still-type polymerization of polyacrylamide produced industrially. Background technique: [0002] Petroleum is an important strategic resource of the country. There is still a considerable amount of recoverable oil in the formation after the secondary and tertiary oil recovery. The method of injecting bulky granular polyacrylamide to adjust the water absorption profile of the formation to increase crude oil production has been applied, but in In practical application, many problems are encountered: surface active agents need to be added to prevent the settlement of granular polymers when preparing such polymers, and the addition of sodium soil additives during injection causes wear and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56
Inventor 周云霞金龙渊孙华白亮王志勇张跃虎云飞索庆华
Owner PETROCHINA CO LTD
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