3[1]Samuel M, Card R J, Nelson E B, et al. Polymer-free fluid for hydra ulic Fracturing[Z]. SPE 38 622,1997.
4[2]Samuel M, Card R j, Nelson E B, et al. A polymer-free fluid for fracturin g applications[J]. Soc Petrol Engrs Drilling & Completion, 1999,14(4):27-33.
5[3]Pitoni E, Marple B D, Heitmann N, et al. Seawater in polymer-free fluids optimizes offshore fracturing[J]. World Oil,2000,221(11):35-40.
6[4]Pitoni E, Burrafato G, Devia F, et al. Polymer-free fracturing fluid revi ves shut-in well[J]. World Oil, 1999,220(9):77-82.
