| abstract |
Short PGA fibers that (a) have strengths of 1 to 20 g/den and (b) decrease in mass by at least 10% after 14 days in 60°C water, whereby (c) three days in 60°C water with a solids concentration of 2 mass% results in a pH of 1 to 5. Said short PGA fibers preferably also have either: (d1) outside diameters of 1 to 120 µm, (e1) lengths of 2 to 30 mm, and (f1) weights of 0.1 to 25 den; or (d2) outside diameters of 1 to 200 µm, (e2) lengths less than 2 mm, and (f2) aspect ratios of 2 to 1,200. Also, a well-treatment fluid containing said short PGA fibers. |