Optimization Of Pag Composite Absorbent Gel Synthesis And Profile Control Efficiency

The absorbent gel used in oilfield has bad flexibility and injection ability .Focused on the situation, this paper starting with performance and structure design, introduces inorganic material MMT to AM monomer homogeneous polymerization system , and adopts free radical solution polymerizing method to polymerize AM/MMT in-situ. Though cross experiment design and single factor optimum seeking method, compared to the system of AM/AA,this paper has prepared PAG composite absorbent gel successfully.The PAG absorbent gel's temperature resistance is 160℃, salt tolerance is 2x 10~5mg/l, rate of water retention (sixty days) is 98.14% in the natural environment. The paper puts forward flexibility exponent, and tests the gel's flexibility exponent is 1.2, which indicates good flexibility. It's toughness index is 0.95 evaluated by screen cloth flexibility. The PAG absorbent gel has bigger contraction degree, good water restoring and rapidly expansion speed, which shows favorable performance. This paper studies it's injection character through core flow test, and points out the mechanism that absorbent gel grain closes off the formation is pressure superposition effect. In addition, this paper brings forward the injection degree concept, which is used for absorbent gel's injection migration character assessment. With the injection degree's accretion, gel grain can migrates more distance and has better injection character. The profile amend ratio can be reached 0.931 educed by profile control experiment. Using sand-packed model, it elicits the PAG absorbent gel's oil displacement increasing extend is 18.35%, which shows better oil displacement efficiency.