The Woodford shale in Oklahoma is an ultra-low permeability reservoir that must be effectively fracture stimulated for the development of shale oil. Hundreds of horizontal wells with 4000ft-5000ft lateral length were stimulated by hydraulic fracture technology. Several pilots with 9000ft lateral length were also tested to figure out the relationship between lateral length and outcome. The research found that the shape of manual fracturein Woodford(WDFD) formation is the most important factor affecting the production.
The wells were stimulated in stages with large hydraulic fracture treatments. However, production isn't directly related to the size of the stimulated volume. Microseismic mapping techniques, simulation method, post-production analysis and formationstress calculation are cooperated to study the characteristics of fracture extension. It is found that there are two kinds of fracture shape which are different from Barnett shale. This paper will test the effect of fracturing liquid and proppant on the fracture growth; The values of triaxial stresswere obtained in the neighboring layers and WDFD formation; Finally, the pilot wellisan example to illuminate fracture extension.
Understanding fracture growth in the Woodford shale will enhance the development of the play by helping operators optimize fracture completion and well placement strategies.