Continuous process of hydraulic fracturing with foam

摘要: A continuous process of hydraulic fracturing a well with in situ nitrogen foam generation, comprising the steps of: (a) preparing an aqueous solution NH 4 Cl having concentration from 2.0-6.0M; (b) NaNO 2 6.0-9.0 M; (c) acetic acid about 40% v/v; (d) adding hydroxyethylcellulose (HEC) to said at 0.3-1.2% w/v form viscosified solution; (e) simultaneously pumping and mixture equimolar amounts thereby initiating reaction between components mixture; (f) into solution, so as initiate while keeping pH 4.75 5.50; (g) injecting cushion generated (pre-flash); (h) formation by which is added sand propping agent, agent being varying zero 0.92 kg/l foaming (i) after fracturing, sand-free (over-flash) same composition foam.