Research Article
Cyclic Injection to Enhance Hydraulic Fracturing Efficiency: Insights from Laboratory Experiments
Table 1
Result summary for the first batch of sandstone.
| Specimen no. | Injection method | Injection flowrate or injection pressure | Breakdown pressure (MPa) | Tensile strength (MPa) | Compressive strength (MPa) |
| 1 | Conventional | 2.4 mL/min | 43.09 | 9.282 | 172.85 | 2 | Conventional | 2.4 mL/min | 38.42 | 8.455 | 150.84 | 3 | Conventional | 2.4 mL/min | 47.59 | 11.611 | 152.73 | 4 | Stepped pressure | 4-8-12-16-20-24 MPa | 29.03 | 10.010 | 171.02 | 5 | Constant pressure | 20 MPa | 31.53 | 9.148 | 157.51 | 6 | Constant pressure | 25 MPa | 42.75 | 10.498 | 164.90 | 7 | Constant pressure | 25 MPa | 36.28 | 8.690 | 153.56 |
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