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水力压裂裂缝内的导流能力是影响油气井压后产量的重要因素。为研究防回流纤维对裂缝内支撑剂导流能力的影响,运用FCES-100裂缝导流仪,对不同粒径支撑剂在纤维以及压裂液影响下的导流能力进行实验测试,掌握了其影响规律。实验结果表明,纤维对不同粒径支撑剂导流能力的影响具有相似规律,在闭合压力较低时几乎无影响,而随闭合压力的增高其影响逐渐增大,当闭合压力达到70MPa后由于纤维的影响可导致导流能力下降30%～40%。压裂液残渣可导致支撑剂导流能力下降50%以上,而在较高闭合压力下由于纤维和压裂液残渣的共同影响可导致支撑剂导流能力下降70%以上。因此对于闭合压力较高的地层应慎重使用纤维防止支撑剂回流。
The hydraulic conductivity in hydraulic fracturing is an important factor that influences the post-pressure production of hydraulic well. In order to study the effect of backflow prevention fiber on the conductivity of proppant in fracture, the conductivity of proppant with different particle size under the influence of fiber and fracturing fluid was tested by using FCES-100 fracture conductivity meter. Affect the law. The experimental results show that the influence of fibers on the conductivity of proppant with different particle sizes is similar, and it has almost no effect when the closing pressure is low. However, the influence of the fibers increases with the closure pressure increasing. When the closing pressure reaches 70MPa, The effects of this can lead to a 30% to 40% reduction of the flow conductivity. Fracturing fluid residues can cause the proppant flux to drop by more than 50%, while at higher closure pressures, proppant flow conductivity can be reduced by more than 70% due to the combination of fiber and fracturing fluid residues. Therefore, the closure of the higher pressure strata should be used carefully to prevent proppant backflow.