Multi-stage fracturing horizontal well currently has been proved to be the most effective method to produce
shale gas. This method can activate the natural fractures system defined as stimulated reservoir volume (SRV), the remaining
region similarly is defined as un-stimulated reservoir volume (USRV). At present, no type curves have been developed
for hydraulic fractured shale gas reservoirs in which the SRV zone has triple-porosity dual-depletion flow behavior
and the USRV zone has double porosity flow behavior. In this paper, the SRV zone and USRV zone respectively are
simplified as cubic triple-porosity and slab dual porosity media. We have established a new productivity model for multifractured
horizontal well shale gas with Comprehensive consideration of desorption, diffusion, viscous flow, stress sensitivity
and dual-depletion mechanism in matrix. The rate transient responses are inverted into real time space with stehfest
numerical inversion algorithm. Type curves are plotted, and different flow regimes in shale gas reservoirs are identified.
Effects of relevant parameters are analyzed as well. The whole flow period can be divided into 8 regimes: bilinear flow in
SRV; pseudo elliptic flow; dual inter-porosity flow; transitional flow; linear flow in USRV; inter-porosity flow and
boundary-dominated flow. The stress sensitivity basically has negative influence on the whole productivity period .The
less the value of Langmuir volume and the lager the value of Langmuir pressure, the more lately the inter-porosity flow
and boundary-dominated flow occurs. It in concluded that the USRV zone has positive influence on production and could
not be ignored.
Productivity Model for Shale Gas Reservoir with Comprehensive Consideration
of Multi-mechanisms
