Hydraulic fracturing became one of the main techniques for production enhancement in the Pokamasovskoye oilfield. While analysing production data (Qliq, water cut, BHP) and fracturing data (net pressure), similar trends became apparent, relating to the proportion of oil and water production after fracture treatments. In particular, after analysing several wells we were able to find similar explanations for production profiles before and after treatments.
Correctly determining initial conditions was the basis for developing this integrated approach. In particular, the following parameters were determined: formation pressure (including measurements from observation wells); long term pre-fracture production data; permeability calculated with petrophysical relationship “core-SP”; identifying lithology types from openhole & cased hole logging data for sandstone, shaly-sandstone, shale, tight rock; rock-mechanics properties measured on cores (E, ν); fluid rheology (k’, n’, viscosity); water source (pH, Fe, Cl); and “StimLab” proppant specifications (including proppant damage factor for reservoir conditions).
Author(s): B. Davidson; Carbo Ceramics, and V. Vasiljeva, S. Beryuschev and R. Bebee; Lukoil-AIK, PetroAlliance SCL, J. Shaoul; StrataGen Engineering
Paper Number: SPE 101585