Studies On Synthesis And Properties Of Graft Copolymer With Sodium Humate And Acrylamide

This paper introduced sodium humate and acrylamide as raw materials to synthetize graftcopolymer by water solution polymerization. A new type of humic acid profile syetem wasprepared by the graft copolymer as the main body. Details as follows:Using sodium humate and acrylamide as raw materials and potassium peroxydisulfate asinitiator synthesized humic acid sodium/acrylamide graft copolymers through aqueoussolution polymerization. Studied the effect of material ratio, initiator, time and temperature tointrinsic viscosity and percent conversion. The best synthesis condition was that materialratio(acrylamide: sodium humate) was about50:1,the temperayure was70℃,the reaction timewas about6h.On the optimum synthesis conditions monomer conversion rate was more than99%and intrinsic viscosity of the graft copolymer was154ml/g. Copolymer structure wasanalysised by infrared spectrum. In addition, the effects of temperature,concentration,shearing rate,shearing time,salt and shear recovery to the apparent viscosity ofcopolymer in aqueous solution and adsorbability were studied.The result indicated thatcopolymer solution had good salt tolerance, shear resistance and adsorbability.Studied adsorptivity of Sodium humate/acrylamide graft copolymers in the oil sand asthe main agent of adjustable cutting syeterm. When plateauing the concentration of relativepermeability improve agent was about600mg/L and the saturated extent of adsorption wasabout3.40287mg/g. The effects of formaldehyde,amine,alkali,temperature and mineral saltwere studied. The result showed that the scheme had good abilities of alkali resistance andthermal endurance and were resistant to salt sex at the formation conditions of45℃. The rockcore-flowage simulation experiments showed that the residual resistance factor of the schemefor oil was1.5and for water was29.8and the breakthrough pressure gradient was great than12MPa.It indicated the scheme had good resistance to erosion sex. This system had strongerability to improve the sweep efficiency so it could enhance oil recovery in the deep profilecontrol process.