| In recent years, the requirement for commercial development is higher and higher,especially in the regular fracturing technology, which is very difficult to get the expectant effect of fracturing the major fissure only. Therefore, being a kind of new fracturing technology, the volume fracturing technology emerges. Additionally, it is used more and more in the oilfield site operations, which is becoming a critical technology for commercial effective development in tight reservoirs. But at present, no matter at home and abroad, the drag reduction technology for volume fracturing is still in its primary stage.For studying the problem, two kinds of new drag reduction agent for volume fracturing are synthesized in this thesis. The two drag reduction agent monomers are synthesized at first and some kinds of their characters are studied to make sure that the quality of monomers are great, after which the two high molecular polymers are synthesized. Then the surface tension,dynamic viscosity, rheological characteristic, temperature tolerance and salt resistance are studied and then the appropriate prescription and experimental conditions are confirmed. The total mass fraction of monomer is 25%(the ratio of acrylamide/2-acrylamido-2-methylpropane sulfonic acid/acrylic acid/dimethylamine/twelve alkyl two methyl allyl ammonium chloride is50.0/25.0/10.0/10.0/5.0; the ratio of acrylamide/2-acrylamido-2-methylpropane sulfonic acid/acrylic acid/dimethylamine/fourteen alkyl two methyl allyl ammonium chloride is55.0/20.0/10.0/10.0/5.0), initiator content is 0.1%, pH value of the solution is 5, reaction temperature is 20℃, reaction time is 4h.At last, it is determined that the drag reduction effect is good of the drag reduction agents synthesized in this experiment. |
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