Asaad Pireh
Samaneh Kansar Zamin Company, Iran
Title: Natural fractures of GarauShaly formation in Zagros fold and thrust belt of Iran and prediction of drilling direction
Biography
Biography: Asaad Pireh
Abstract
Shale-gas production depends on natural and hydraulic fractures to flow it to well.Well completion practices employ hydraulic fracturing technology to access the natural fracture system and to create new fractures.Older fractures direction and hydraulic fractures direction in response to maximum stress direction is the important factor in value of production. For further crossing of hydraulic fractures, drilling perpendicular to maximum horizontal stress is the finest direction of drilling in unconventional resources and said that’s mechanical properties is determinant factor in productivity. I should say that theory is correct about creating hydraulic fractures in isotropic rocks but almost all of the rocks of the resources of the world have heterogeneous properties. Such a situation will rarely be encountered in real rocks that are usually full of heterogeneities (different layers) and weak planes (bedding contacts, cleavages or existing fractures). Based on hydraulic fracturing and determinant factor of productivity, drilling perpendicular to minimum horizontal stress will be the worst direction of drilling, but in drilling perpendicular to maximum horizontal stress the stability of borehole is the lowest. Based on of pronounced theories and practical works, some of the weak planes have a potential of reactivation before the others and before creating hydraulic fractures with minimum of stress implies from hydraulic fracturing which improve the productivity.
