水力压裂控制坚硬顶板室内试验及现场测试
Lab Experiment and Field Test of Hydraulic Fracturing in Controlling Hard Roof
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摘要: 为了获得坚硬顶板在水力压裂作用下的裂缝扩展规律,采用室内试验研究了不同的预制横向切槽参数和泵注速率作用下的压裂效果。室内试验结果表明:预制横向切槽可有效的降低水力裂缝的起裂压力,较长的切槽长度与合适的切槽角度可使水力裂纹有更平滑的转向路径,从而改善近井筒区域裂缝复杂性。此外,对水力压裂的影响范围及效果进行了现场试验。现场试验结果表明:水力裂纹的扩展范围在30~50 m间,处理后的顶板无明显冲击性来压。随工作面推进顶板能及时跨落,说明水力压裂能有效控制坚硬顶板。Abstract: To obtain the crack growth law of hard roof under hydraulic fracturing, laboratory experiments were used to study the fracturing effect under the effect of different prefabricated transverse grooving parameters and pump injection rate. The experiments result shows: prefabricated transverse grooving can effectively reduce the initiation pressure, and longer grooving length and appropriate grooving angle may result in a smoother reorientation path for hydraulic fracture, thus improving the near-wellbore complexity. Besides, field experiments are also conducted to test the influence range and treatment effect. The result of field experiments shows: the propagation of hydraulic fractures ranges from 30 m to 50 m and no obvious impact pressure occurs after treatment. The roof fragments can also drop freely with the advancing of working face, which shows that hydraulic fracturing can effectively control the hard roof.
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