A Study of Stress Sensitivity of Abnormal High Pressure Shale Gas#br#
Reservoir and Reasonable Productivity Allocation

doi:10.11885/j.issn.1674-5086.2014.03.11.01

Abstract

Abstract:

Production of abnormal high pressure shale gas reservoir is characteristic of rapid decline of initial production. On the
one hand，this is related to the well production by fracturing of low permeability shale gas；on the other hand，it may be related
to the pressure-dependent permeability of reservoir and fracture. This paper analyzes the stress- sensitivity of hydraulic fracture
and shale gas reservoir，and find out that there is a big difference in the mechanical properties between them，so they should be
taken into account separately. By using numerical simulation method，we calculate the effect of pressure-dependent permeability
and production allocationon the estimated ultimate recovery（E UR），and the results show that the effect of stress sensitivity on
shale gas reservoir is little，while the influence of hydraulic fracture stress sensitivity is stronger. If stress sensitive permeability
is only related to pressure，the production allocation has very little influence on EUR. But if under the high production rate and
with stronger permeability stress sensitivity decay curve，the initial production proration has a greater influence on EUR. With
graphics diagnosis method，we confirmed that gas wells with lower initial allocation are of greater production potential. The
research results can be used for reasonable proration optimization of high pressure shale gas wells.

Key words: shale gas, stress sensitivity, allocation, abnormal high pressure, reservoir simulation

CLC Number:

TE37

YANG Bo1*, LUO Di2, ZHANG Xin1, WU Dong2, SHANG Shaofen2. A Study of Stress Sensitivity of Abnormal High Pressure Shale Gas#br# Reservoir and Reasonable Productivity Allocation[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.03.11.01.

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A Study of Stress Sensitivity of Abnormal High Pressure Shale Gas#br# Reservoir and Reasonable Productivity Allocation

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