Summary

In this paper, the use of various pressure measurements is investigated for determining formation pressure and permeability distributions by use of the multiprobe formation testing packer and probe modules (PPM's) in horizontal wells. It is shown that reservoir pressure measurements along the wellbore give local and reservoir-scale information about how the reservoir is being depleted and how cleanup takes place. The estimation of horizontal and vertical permeabilities, skin, and reservoir pressure along the wellbore is also presented by use of interval (local) pressure transient tests. For PPM in horizontal wells, an interpretation method is presented for determining the reservoir parameters. A few interval pressure transient test (IPTT) examples are presented for formation pressure and permeability distributions, and fluid sampling.

Introduction

With the increasing number of horizontal wells, in addition to conventional well tests, interval tests have been conducted in many wells for formation pressure, permeability, and fluid sampling. We present the use of interval (local or sectional) pressure transient testing techniques for different reservoir and wellbore conditions in horizontal wells. Because they are dynamic and direct, pressure measurements and interval (local) transient tests provide essential information for well productivity and dynamic reservoir description, and hold critical importance for exploration as well as production and reservoir engineering. For exploration, pressure measurements and interval tests may simply show that the formation is able to produce, may permit sampling of the formation fluid, and may provide productivity index, reservoir pressure, permeability, and data for heterogeneity.

SPE 53002 was revised for publication from paper SPE 39523, first presented at the 1998 SPE India Oil and Gas Conference and Exhibition, New Delhi, India, 17-19 February.

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