This paper demonstrates a new approach using the Boundary Element Method (BEM) to solve for pressure transient behavior in composite and sectionally homogeneous reservoirs. A boundary element solution is proposed in Laplace space to a piecewise homogeneous reservoir with arbitrary geometry of each region. Any number of such regions with different rock and fluid properties can be included in the solution procedure. This formulation can solve fluid injection problems which show composite behavior (as in steam injection and CO2 flooding). In addition, impermeable barriers of any shape and orientation as well as large pressure support sources (aquifers) can be included.


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