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Title: Evaluation of flow characteristics of perforations including nonlinear effects with the finite-element method

This study presents results of finite-element modeling of steady-state flow in perforated natural completions. Use of a mesh chosen carefully by grid sensitivity analysis permits evaluation of flow with more precision than that achieved by previous investigators. Also, for the first time, flow characteristics of perforated completions are evaluated with the non-Darcy effect resulting form converging flow around the perforation taken into account. The results indicate confirmation of Locke's results qualitatively but 5 to 10% overprediction by the nomograph, the importance of angular phasing between adjacent perforations, the uncertainty in generally accepted severe permeability impairment in the compacted zone, and a significant reduction in productivity owing to a non-Darcy effect around the perforation for high-rate gas wells.
Authors:
Publication Date:
OSTI Identifier:
6776458
Resource Type:
Journal Article
Resource Relation:
Journal Name: SPE (Society of Petroleum Engineers) Product. Eng.; (United States); Journal Volume: 2:2
Research Org:
Schlumberger Perforating and Testing Center
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; NATURAL GAS WELLS; FLOW MODELS; PERFORATION; STEADY FLOW; OIL WELLS; ACCURACY; DATA COVARIANCES; FINITE ELEMENT METHOD; INCIDENCE ANGLE; NOMOGRAMS; NONLINEAR PROBLEMS; PERMEABILITY; PRODUCTION; SENSITIVITY ANALYSIS; STEADY-STATE CONDITIONS; WELL COMPLETION; DIAGRAMS; FLUID FLOW; MATHEMATICAL MODELS; NUMERICAL SOLUTION; WELLS 020300* -- Petroleum-- Drilling & Production; 030300 -- Natural Gas-- Drilling, Production, & Processing