Type- and Decline-Curve Analysis With Composite Models Academic Article uri icon

abstract

  • Summary This paper presents applications of new type curves generated with a composite model for the analysis of radially damaged and stimulated wets. These type curves can be used to estimate the depth and degree of damage or stimulation. Some of the type curves include phase redistribution, and the production type curves can be used to forecast incremental production from the stimulation of damaged wells. Introduction The use of pressure and pressure-derivative type curves to improve flow-regime detection and reservoir property evaluation is not new to the petroleum industry. Several type curves have been published for analyzing transient test data from homogeneous-type reservoirs. Bourdet et al. developed pressure-derivative type curves for wans in a homogeneous reservoir with radial flow. Several type curves are available to analyze test data from wells that intercept finite- or infinite-conductivity hydraulic fractures. The conventional method for radial-flow type-curve analysis uses the steady-state or zero-thickness skin concept, which makes all conventional homogeneous, radial-flow models inadequate for analysis of test data from wells that intercept long, finite-conductivity hydraulic fractures. These radial-flow type curves are neither the correct model of a radially damaged well that results from a reduction in permeability during drilling, completion, or production, nor of a radial stimulation from an acid treatment. These types of reservoirs are best modeled by the composite system we present in this paper. Our purpose is to present a family of type curves generated from the composite model that is most applicable to the analysis of welltest data from radially damaged and stimulated wells. We introduce the term radial conductivity, C, which is a measure of the conductive capacity of the formation around the well in the radial direction. We present type curves for analyzing test data where boundary effects were felt during the test. We also present type curves for analyzing tests from damaged or stimulated wells distorted by wellbore storage and phase redistribution, which no published curves can handle. Fair phase-redistribution model was used as an inner-boundary condition. In addition to the complete set of pressure and pressure-derivative type curves for damaged and stimulated wells, we also present rate and production type curves. These type curves can be used to forecast production after remedial stimulation of a damaged well and to predict production scenarios for different degrees of stimulation. We present several example type-curve analyses to demonstrate the use of each type curve.

author list (cited authors)

  • Olarewaju, J. S., Lee, J. W., & Lancaster, D. E.

citation count

  • 4

complete list of authors

  • Olarewaju, Joseph S||Lee, W John||Lancaster, David E

publication date

  • March 1991