The Importance of Clean Off-Plane Perforations in all Phases of a Deepwater Well and its Productivity Impact
- Karthik A. V. Mahadev (BP) | Prashant Haldipur (BP) | Steven J. Tinker (BP) | Carlos Stewart (BP) | Alistair M. Roy (BP)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2019
- Document Type
- Journal Paper
- 372 - 381
- 2019.Society of Petroleum Engineers
- productivity, skin, fracturing and stimulation, completion effectiveness,, deepwater, strategic, sand control, frac-packs
- 14 in the last 30 days
- 92 since 2007
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High-permeability reservoirs in deepwater Gulf of Mexico (GOM) have been completed with frac packs, resulting in high-production-rate wells. The initial production rates for these wells range from 3,000 B/D to almost 40,000 B/D; and these rates can be sustained over extended periods of time (several years). Most of these developments in the GOM require sand control with cased hole frac packs (CHFPs) as the preferred completion technique. In addition to providing reliable sand control, frac packs result in relatively low skin by bypassing near-wellbore damage. During the past few years, operators have focused on reducing skin and improving the production from these wells, leading to a more detailed analysis of frac-pack performance. This paper will demonstrate that in high-permeability reservoirs, production from the off-plane perforations is as important as production from the fracture. It examines the theoretical basis of the contribution of off-plane perforations to total flow and demonstrates the adverse effect on this contribution because of damage from drilling fluids and solids, cementing spacers and solids, fluid-loss materials, perforating debris, wellbore debris, and crosslinked gel. Three case histories are analyzed to evaluate and quantify these effects and to show that the lower the conductivity contrast between the (high permeability) reservoir and the fracture, the higher the production benefit that can be realized by effectively cleaning the off-plane perforations.
|File Size||1 MB||Number of Pages||10|
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