Lessons learned from evaluation of frac-pack flow performance before and after full clean-up for subsea wells in high-permeability gas reservoirs

M. Nozaki, R. C. Burton, V. J. Pandey, K. Furui

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

The objectives of this paper are: 1) to evaluate clean-up flow effects on High Rate Water Pack (HRWP) and Cased Hole Frac Pack (CHFP) completions and 2) to develop predictive models to quantify clean-up effects on well inflow performance in these types of sand control completions. Analysis methods include: data acquisition and well test design for reservoir property estimation, multirate test and non-Darcy skin factor analysis, and perforation tunnel permeability factor (Kpt/Kr) analysis to evaluate gravel pack flow performance. Eight zones from five gas wells have been investigated using this procedure. All pressure data were obtained by intelligent well systems' (IWS) permanent downhole pressure gauges located at reservoir depth. The study results show a two-fold improvement in the average perforation tunnel permeability after clean-up flow. Based upon the study findings, two empirical correlations that can predict postclean-up well inflow performance are developed. For planning purposes, Kpt/Kr improvement factors can be estimated based on formation permeability while for wells tested using short-term clean-up flows Kpt/Kr improvement factors and stabilized well flow potential can be calculated from Water/Gas Ratio (WGR) data collected during the clean-up flow period. These predictive models are expected to help engineers assess future well performance for high-rate water pack and frac-pack completions in high permeability reservoirs. A thorough review and comparative well performance analysis of a series of HRWP and CHFP wells has been conducted using high quality downhole pressure data. The perforation tunnel permeability (Kpt/Kr) database and correlations presented in this work can be used for predicting both initial and long-term well flow performance of gravel and frac-packed wells, which can be very useful information for optimizing future completion designs and field development plans.

Original languageEnglish
DOIs
Publication statusPublished - 2017
EventSPE Annual Technical Conference and Exhibition 2017 - San Antonio, United States
Duration: 2017 Oct 92017 Oct 11

Other

OtherSPE Annual Technical Conference and Exhibition 2017
CountryUnited States
CitySan Antonio
Period17/10/917/10/11

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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    Nozaki, M., Burton, R. C., Pandey, V. J., & Furui, K. (2017). Lessons learned from evaluation of frac-pack flow performance before and after full clean-up for subsea wells in high-permeability gas reservoirs. Paper presented at SPE Annual Technical Conference and Exhibition 2017, San Antonio, United States. https://doi.org/10.2118/187227-ms