Formation Integrity and Pore System Evaluation for Stimulated SandstoneFormation Using In-Situ Generated Acid Catalyzed by A Fused ChemicalReaction

摘要

This study aims at evaluating the mechanical integrity and the changes in the pore system of illitic sandstoneformations being treated with HF acid generated in-situ and thermochemical fluids(TCF).Firstly,the acid-generating fluids were injected separately inside the core within a typical core flooding experiment.Afterthat the core permeability,NMR porosity and rock static and dynamic parameters such as rock strength(UCS),dynamic Young's modulus,Poisson's ratio,shear modulus and bulk compressibility were evaluatedbefore and after the treatment.Sand production prediction model was used to examine the potential of sandproduction problems for the cores treated with the in-situ generated acid(ISGA)and the TCF.Treating Scioto cores with the ISGA only led to permeability enhancement with final to initialpermeability ratio K_(final)/K_(initial)of 1.2.In addition,treating the same cores with acid generating fluids andthermochemicals resulted in higher permeability enhancement with