Title of article :
Technique of multipulse gas load fracturing
Author/Authors :
PU، نويسنده , , Chunsheng and Sun، نويسنده , , Zhiyu and Wang، نويسنده , , Xiang-zeng and LUO، نويسنده , , Ming-liang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
4
From page :
636
To page :
639
Abstract :
In destressing and fracturing formation with multipulse gas loading, the pressure gradient of deflagration gas along cracks affects crack initiation and extension. The overlay principle is used to resolve complicated loads of the borehole wall into simple ones, based on elastic mechanics and linear elastic fracture mechanics. A function describing gas pressure distribution along the crack is proposed to derive the corresponding stress strength of the crack top, and then the conditions of crack initiation in borehole rocks are concluded. The conditions reflect the influence of the gas pressure gradient varying with time on fracture geometry. The example analysis and field contrast test reveal that, compared with the common High Energy Gas Fracturing, multipulse gas loading fracturing gives rise to higher crack initiation pressure, lower crack arrest pressure, greater extension of fracturing time, and forms twice to thrice the fracture length in the formation. Combined with hydraulic fracturing, it can lower formation breakdown pressure and further improve formation permeability.
Keywords :
Multipulse , load fracturing , deflagration gas , crack extension
Journal title :
Petroleum Exploration and Development
Serial Year :
2008
Journal title :
Petroleum Exploration and Development
Record number :
2300057
Link To Document :
بازگشت