Impact of geological structure on process and effect of pulsating hydraulic fracturing
HAO Jun
Abstract：In order to study the impact of the geological structure on the process and effect of pulsating hydrau-lic fracturing(PHF),the industrial experiments of PHF is carried out in the tectonic zone and the non-tectonic zone respectively,then the difference of the process and effect of pulsating hydraulic fracturing in the two cases is analyzed.The results show:The fault structure brings out a weak surface in pulsating hydraulic fracturing ar-ea,easily inducing seam crack extension to the fault,and pulsating water continuously moves towards the direc-tion of fault.The pulsating water injection time and injection volume of of PHF in the tectonic zone are signifi-cantly larger than those in the non-tectonic zone,which has a large water blocking effect on gas drainage and hinders the dynamic process of gas migration;The natural pressure relief zone of the fault prevents the pulsa-tion pressure from rising during hydraulic fracturing process,which reduces the effect of PHF;The geological structure reduces the increment of stable gas drainage concentration before and after PHF,and improves the in-itial concentration of gas drainage.
Keywords：geological structurepulsatinghydraulic fracturingwater blocking effect
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 55-60,75 )