Acrylamide graft copolymer oil-displacing agent and preparation method thereof

A graft copolymer and acrylamide technology, which is applied in the field of acrylamide graft copolymer oil displacement agent and preparation, can solve problems such as failure to achieve engineering construction, sudden change of solution properties, etc. water soluble effect

Inactive Publication Date: 2015-01-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PAM or HPAM are highly sheared, highly valenced mineral ions (Ca 2+ , Mg 2+ etc.), high temperature and other conditions, it is easy to hydrolyze, degrade, chain curl, etc., resulting in a sudden change in the performance of the solution and failing to meet the requirements of engineering construction

Method used

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  • Acrylamide graft copolymer oil-displacing agent and preparation method thereof
  • Acrylamide graft copolymer oil-displacing agent and preparation method thereof
  • Acrylamide graft copolymer oil-displacing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of AM / AA / APEG / KGM graft copolymer

[0029]According to the ratio of raw materials in Table 1, take KGM in a 150mL three-necked flask, add 20ml of deionized water, and stir at a constant temperature of 30°C for 30min to allow it to fully swell. Then add AM, AA and APEG in sequence, then use 25% NaOH to adjust the pH to the specified value, make the system into a 25% aqueous solution, pass nitrogen gas for 10 minutes, raise the temperature to 40°C and keep the temperature for 20 minutes, add the initiator cerium ammonium nitrate, and pass Nitrogen for 10 minutes, after reacting at 40°C for 8 hours, a light yellow transparent viscous liquid was obtained. Slowly pour the product into a beaker filled with absolute ethanol and keep stirring to obtain a white precipitated floc, which is soaked for 5 hours. The unreacted konjac glucomannan, graft copolymer and self-polymer were all insoluble in absolute ethanol, filtered under reduced pressure, an...

Embodiment 2

[0032] Embodiment 2: AM / AA / APEG / KGM graft copolymer structure characterization

[0033] The infrared spectrogram of the graft copolymer AM / AA / APEG / KGM synthesized by embodiment 1 is as follows figure 1 shown. The figure shows that the infrared spectrum of the copolymer is at 3434cm -1 There is a strong absorption peak at , which is the stretching vibration of O-H in the hydroxyl group, and the peak intensity is relatively strong, indicating the existence of polyhydroxyl structure; the stretching vibration of N-H is at 3300cm -1 Left and right, because the hydroxyl absorption peak is very strong, it covers the N-H absorption vibration peak, so the N-H absorption peak does not appear; at 2938cm -1 The strong absorption peak at -CH 2 - stretching vibration at 1677cm -1 It is the stretching vibration of -C=O, which proves that there is an amide structure in the polymer molecule, and the product is an AM / AA / APEG / KGM graft copolymer.

Embodiment 3

[0034] Embodiment 3: the mensuration of AM / AA / APEG / KGM graft copolymer relative molecular weight

[0035] With reference to GB / T 12005.10-92 "Polyacrylamide Molecular Weight Determination Viscosity Method", the tetrapolymer prepared in Example 2 was used to prepare a 0.1wt% solution, and at 30±0.1°C, it was measured by stepwise dilution method. The intrinsic viscosity of the branch copolymer was 1129.3 mL / g. Using empirical formula M=802[η] 1.25 , M is the viscosity-average relative molecular mass, [η] is the intrinsic viscosity, 802, and 1.25 are empirical constants. The calculated viscosity-average relative molecular weight of the polymer is about 5.3×10 6 .

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Abstract

The invention relates to an acrylamide graft copolymer oil-displacing agent and a preparation method thereof. The acrylamide graft copolymer oil-displacing agent is water-soluble, is low in using amount and has relatively high thickening property and good temperature resistance and shear resistance. The invention adopts the technical scheme as follows: the acrylamide graft copolymer oil-displacing agent comprises the following raw materials and monomers in mass percentages: with gram as a mass unit, 51.5-58.8% of AM (acrylamide), 40-45.5% of AA (acrylic acid), 0.1-1.5% of APEG (allyl polyethylene glycol ether) and 0.1-1.5% of KGM (konjac glucomannan). The preparation method of the acrylamide graft copolymer oil-displacing agent comprises the following steps: adding the KGM into a reactor, adding deionized water, and stirring for 30 minutes at the constant temperature of 30 DEG C so as to sufficiently swell the obtained mixture; sequentially adding the AM, the AA and the APEG; regulating PH to 6-8, inflating nitrogen for 10 minutes, and adding an initiator ceric ammonium nitrate; and reacting for 8 hours at 35-55 DEG C, and roughly separating, refining, drying and pulverizing a product to obtain a polymer AM / AA / APEG / KGM. The viscosity retaining rate of a 0.1wt% solution of the acrylamide graft copolymer oil-displacing agent at 100 DEG C is as high as 91.3%; and the acrylamide graft copolymer oil-displacing agent can improve the recovery factor of simulation crude oil by 11.3%.

Description

technical field [0001] The invention relates to an acrylamide graft copolymer oil displacement agent used in the petroleum industry and a preparation method thereof. Background technique [0002] Petroleum is an important energy and chemical raw material. With the rapid development of social economy, people's demand for petroleum continues to increase. However, petroleum is a non-renewable resource, and its reserves are constantly decreasing. However, about 60% of crude oil in domestic oil reservoirs cannot be exploited by conventional oil recovery technology, which directly restricts the development of national economy. In order to ensure the normal needs of the national economy, it is imminent to enhance oil recovery. Therefore, there is an urgent need to redevelop old oilfields, explore the potential of old oilfields, and stabilize oil production. Enhanced Oil Recovery (EOR) is one of the methods to increase the production of old oilfields. This technology has been appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F251/00C08F220/56C08F220/06C08F216/14C08F291/06C08F283/06
Inventor 叶仲斌封明明苟绍华刘曼蒋文超刘贤明周利华
Owner SOUTHWEST PETROLEUM UNIV
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