Perpustakaan Digital ITB

Matrix acidizing designs developed for analog wells cannot be assumed directly transferable because differences in reservoir properties, rock reactivity, injectivity, completion configuration, treatment path, and pressure constraints may alter stimulation response and hydraulic feasibility in the target well. This study evaluates carbonate matrix acidizing design transferability through classified published coreflood data, Buijse-Glasbergen reconstruction of PVbt-interstitial-velocity relationships, analytical equivalentwormhole radius, skin, and theoretical FOI calculations, analog-well acid-system screening, sequential main-acid rate and volume sensitivities, and target-well simulation. Pure Direct Transfer retains analog acid chemistry, concentration, additive package, stage sequence, rate, and volume, whereas Adapted Transfer retains the acid-system basis and stage sequence while adjusting rate and volume under target-well hydraulic constraints, thereby distinguishing failure of unchanged replication from failure of the underlying acid-system basis. The coreflood data covered mineralogy, acid formulation, concentration, temperature, permeability, and experimental conditions. Under the same EPDI acid system, calcite-dominant Indiana limestone produced a lower minimum PVbt than dolomite-dominant Silurian dolomite, 0.41 versus 2.52, with equivalent wormhole radii of 6.882 versus 2.803 ft at 100 gal/ft and 8.423 versus 3.420 ft at 150 gal/ft. Analytical skin changed from -2.785 and -1.886 to -2.987 and -2.085, while theoretical FOI increased from 1.610 and 1.345 to 1.685 and 1.396 between 100 and 150 gal/ft, indicating a stronger calcitic response with diminishing incremental improvement at higher acid volume. Four acid systems, 28% HCl, 15% HCl, HClAcetic 15/10, and HCl-Acetic 15/5, were screened for calcite-dominant Well BPK-1 and dolomitedominant Well IBU-1 under fixed treatment and model conditions. Sequential sensitivities retained HClAcetic 15/10 for BPK-1 at 2.20 bbl/min and 106 bbl, producing final skin -1.91, modeled wormhole length 2.13 ft, maximum bottomhole pressure 6,101 psi, and pressure margin 731.4 psi, and retained 28% HCl for IBU-1 at 1.00 bbl/min and 270 bbl, producing final skin -1.35, modeled wormhole length 1.23 ft, maximum bottomhole pressure 2,412 psi, and pressure margin 95.9 psi. Pure Direct Transfer to Well DOA-1 was rejected because the BPK-1- and IBU-1-derived cases reached maximum bottomhole pressures of 24,918 and 9,186 psi, exceeding the estimated target-well fracture pressure of 4,186.7 psi. After rate-volume adaptation, both designs became hydraulically feasible, and the IBU-1-derived case was selected because it achieved final skin -0.43, modeled wormhole length approximately 0.53 ft, pressure margin 330.7 psi, and treatment duration 1,772 min. This selection does not indicate intrinsic superiority of a dolomitederived design for a calcite-dominant target; it shows that transferability reflects acid chemistry, target-rock reactivity, injectivity, completion hydraulics, rate, and volume. The selected case therefore represents conditional technical feasibility under the applied model inputs and assumptions, not a field-validated or globally optimized treatment and not a direct field-execution recommendation.