Preparation And Flocculating Performance Of Inverse Emulsion Of Water Soluble Polymer

To solve the shortcomings of the low permeability heterogeneous reservoir water plugging and profile control in the gel or swellable particles to hardly enter the deep reservoir and t-he relatively shorter water plugging valid period, in this thesis,we have used Span80and OP-10as compound emulsifier,kerosene as medium,acrylamide,2-acrylamide-methyl propanesulfonic acid and acrylic acid as monomer, N,N-methylene bis acrylamide as the crosslinking agent to afford two kinds of water soluble polymer AM/AA and AM/AA/AMPS copolymer by the method of inverse emulsion polymerization. Moreover, the reaction conditions and the monomer content were confirmed,, the structure of the polymer was testified by opticalmicroscope and infrared spectrum and nuclear magnetism, The reaction was examined underdifferent reaction conditions, The pattern and particle size of polymer microspheres werecharacterized by microscope and laser particle size analyzer.The affect was examined ofdifferent salts solution on the absorption properties of the copolymer, The results show that:At the reaction temperature45℃, pH is7, oil-water ratio of1.2:1, emulsifying m (SPAN80)/m (OP-10)=9:1, emulsifying agent is6%of whole system, initiator agent(m (APS)/m (NaHSO3)=1) of monomer0.15%, the ratio of m (AM): m (AA) is6:4, thetotal mass of AM and AA accounts for the water massfraction is30%, crosslinkingagent MBAA amount of monomer0.15%, reaction time4h, P(AM/AA)linked polymermicro-ball with better water absorbency can be preparation. When the reactiontemperature45℃, pH is7, initiator agent (m (APS)/m (NaHSO3)=1) of monomer0.2%, theratio of m (AM): m (AA):m(AMPS) is7:2:1, crosslinking agent MBAA amount ofmonomer0.1%, reaction time4h, P(AM/AA/AMPS)linked polymer micro-ball with betterwater absorbency can be preparation. The microspheres which had homogeneous particle sizeand complete roundness were obtaine. the water absorbent properties of the copolymer wasdifferent in different concentration of salt solution and the divalent salt play a greaterinfluence than the monovalent salt solution. The core flow experiment showed that: Twokinds of polymer microsphere latex has good injectivity, can smoothly enter the lowpermeability core, and water flooding core pressure gradient increased after injection andexpansion of latex static, polymer microsphere latex had good plugging effect, and plugging rate of them was more than90%.In this article, To improve the profile control effect of microspheres, we studied theunderground copolymerization couplet rubber water plugging system, determined the best ofplugging agent formulation which was composed of acrylamide (6%),2-acrylamide-methallyl sulfonate (1%), acrylic acid(3%), cross-linking agent(0.15%),ammonium persulfate(0.15%), polyacrylamide(0.1%). the influence factors forpolymerization reaction were discussed, the polymerizable gel properties were also evaluated.The results showed that the gelling time of this plugging agent was controllable, Thepolymerization time can be adjusted to control the amount of inhibitor, the amount canbe controlled in the range of0.01%~0.05%,the gelling time between50~260min.the formedgel was strong, water swelling and had well salt resistance.