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Title: Micro-mechanical modeling of perforating shock damage

Shaped charge jet induced formation damage from perforation treatments hinders productivity. Manifestation of this damage is in the form of grain fragmentation resulting in fines that plug up pore throats along with the breakdown of inter-grain cementation. The authors use the Smooth Particle Hydrodynamic (SPH) computational method as a way to explicitly model, on a grain pore scale, the dynamic interactions of grains and grain/pores to calculate the damage resulting from perforation type stress wave loading. The SPH method is a continuum Lagrangian, meshless approach that features particles. Clusters of particles are used for each grain to provide representation of a grain pore structure that is similar to x-ray synchrotron microtomography images. Numerous damage models are available to portray fracture and fragmentation. In this paper the authors present the results of well defined impact loading on a grain pore structure that illustrate how the heterogeneity affects stress wave behavior and damage evolution. The SPH approach easily accommodates the coupling of multi-materials. Calculations for multi-material conditions with the pore space treated as a void, fluid filled, and/or clay filled show diverse effects on the stress wave propagation behavior and damage. SPH comparisons made with observed damage from recovered impacted sandstone samplesmore » in gas gun experiments show qualitatively the influence of stress intensity. The modeling approach presented here offers a unique way in concert with experiments to define a better understanding of formation damage resulting from perforation completion treatments.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. Los Alamos National Lab., NM (United States)
  2. Schlumberger Perforating and Testing (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
OSTI Identifier:
650174
Report Number(s):
LA-UR--97-4841; CONF-980226--
ON: DE98004246; TRN: AHC2DT04%%86
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: SPE formation damage control conference, Lafayette, IN (United States), 18-19 Feb 1998; Other Information: PBD: 17 Nov 1997
Research Org:
Los Alamos National Lab., NM (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; WELL COMPLETION; PERFORATION; FORMATION DAMAGE; HYDRODYNAMICS; CALCULATION METHODS; STRESS INTENSITY FACTORS; MATHEMATICAL MODELS; PORE STRUCTURE; RESERVOIR ROCK