Abstract
Abstract The available hydraulic fracturing (HF) techniques for horizontal wells (HW) allow stimulating one or several HW intervals, as well as creating fractures lying at various angles to the horizontal wellbore. The simplest of these methods available to operators is conventional HF; besides, operators may make use of different interval-wise HW stimulation techniques – both with and without packer systems. During 2006-2007, Rosneft Oil Company performed over 20 HW HF operations. Two HF technologies have been tested: Conventional Frac and multiple-point Hydrajet stimulation. The obtained results demonstrate the efficiency of HF on Rosneft fields, in West Siberian geological conditions: HF has allowed reactivating a number of wells. The considerable stock of horizontal wells has made it possible to analyze the influence of various factors affecting HF efficiency, such as completion, wellbore orientation, and formation permeability. Several operations were successfully carried out against weak water and gas barriers. This paper presents Rosneft's experience of HF in horizontal wells and adaptation of conventional HW hydrofrac techniques to West Siberian geological conditions. The article features also some details of HF operations and the results arrived at; HW HF risks and limit conditions for different technologies are defined. Some criteria for HF candidate selection are given.
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