Preparation method of microbial polysaccharide modified copolymer gel plugging agent
A technology of microbial polysaccharide and gel plugging agent, applied in the field of oilfield chemistry, can solve the problems of poor temperature and salt resistance and erosion resistance, operator and formation damage, short production cycle, etc., and achieve salt resistance and shear resistance. Good, high sweep efficiency, improve the effect of mobility ratio
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Embodiment 1
[0032] The xanthan gum was prepared into a solution with a mass fraction of 0.1% with distilled water and stirred evenly, followed by adding 2.5 g of acrylamide (the mass ratio of xanthan gum to acrylamide was 1:10), 0.0825 g of N,N'-methylene bisacrylamide (accounting for 3% of the total mass of xanthan gum and acrylamide), nitrogen was introduced into the system, and Na 2 SO 3 0.0294g, (NH 4 ) 2 S 2 O 8 0.0532g (this initiation system accounts for 3% of the total mass of xanthan gum and acrylamide, wherein Na 2 SO 3 with (NH 4 ) 2 S 2 O 8 The molar ratio of 1:1), stirred evenly, and reacted in a constant temperature water bath at 50 °C for 8 h to form a gel.
[0033] The viscosity of the gel was measured by NDJ-8S viscometer 3.68×10 4 The effects of mPa·s, temperature and salinity on the gel strength of copolymers are as follows figure 2 and attached Figure 4 shown.
[0034] from figure 2 In the specific example 1, the influence curve of temperature on the ...
Embodiment 2
[0037]Xanthan gum is mixed with distilled water and is the solution that mass fraction is 0.3% and stirs evenly, adds the 2-acrylamido-2-methylpropanesulfonic acid of 5.0g successively (xanthan gum and 2-acrylamido-2- The mass ratio of methylpropanesulfonic acid is 1:20), 0.0525g of N,N'-methylenebisacrylamide (1% of the total mass of xanthan gum and 2-acrylamido-2-methylpropanesulfonic acid %), feed nitrogen into the system, add Na in turn 2 SO 3 0.0373g, (NH 4 ) 2 S 2 O 8 0.0676g (this initiating system accounts for 2% of the total mass of xanthan gum and 2-acrylamido-2-methylpropanesulfonic acid, wherein Na 2 SO 3 with (NH 4 ) 2 S 2 O 8 The molar ratio is 1:1), stirred evenly and reacted in a constant temperature water bath at 50°C for 8 hours to form a gel.
[0038] Measure the viscosity of the gel with NDJ-8S viscometer 4.26×10 4 mPa·s, the effect of temperature and salinity on the gel strength of the copolymer is shown in the attached figure 2 and attached ...
Embodiment 3
[0042] Chitosan was formulated with distilled water into a solution with a mass fraction of 1% and stirred evenly, followed by adding 15g of acrylamide (the mass ratio of chitosan to acrylamide was 1:15), 0.8g of N,N'-methylene base bisacrylamide (accounting for 5% of the total mass of chitosan and acrylamide), feed nitrogen into the system, add initiator (NH 4 ) 2 [Ce(NO 3 ) 6 ] 0.64g (the initiation system accounts for 4% of the total mass of chitosan and acrylamide), stirred evenly and reacted in a constant temperature water bath at 50°C for 8h to form a gel.
[0043] Measure the viscosity of the gel with NDJ-8S viscometer 8.64×10 4 mPa·s, the effect of temperature and salinity on the gel strength of the copolymer is shown in the attached figure 2 and attached Figure 4 shown.
[0044] from figure 2 In specific example 3, the influence curve of temperature on the copolymer gel strength can be seen that as the ambient temperature increases, the gel viscosity increas...
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