Abstract:

To find the failure mechanics mechanism of BHA, A thorough research on the stress distribution of BHA was done. In this paper, a analytic mechanics model of BHA in curvature hole was developed to find the bending moment or bending stress distributions feature based on the beam theory in structure mechanics. Considering higher rate of build - up, a differentmethod unlike the co.analyzedcriticaloil, well, SBNDuan YQs good results in many oil and gas reservoirs. However, a lot of experiments indicate that fractured reservoir and low permeability reservoir are typical stress sensitive zone. The permeability decreases with decreasing of pore pressure and increasing of effective stress in oil field exploitation. So changes of permeability and porosity with stress should be considered in well test interpretation. According to results of experiment, this paper presented a mathematics model of fractured reservoirs with stress sensitivity and obtains type curves through by numerical Laplace inversion. This paper also discussed pressure transient and characteristics of type curves, and investigated stress impacting on buildup interpretation.

Key words: stress sensitive reservoir, pressure transient, well testing