High volume repair and insulation treatments as effective water coning prevention method

Abstract

Introduction. For massive carbonate reservoir with high vertical permeability and underlying water, coning of bottom water is a necessary part of development process. As an example, the way for water coning prevention using thermogelling composition for Zapadno-Hosedauskoe field is described.

Aim. The aim of investigation is planning and realization of water coning prevention pilot project. It is also necessary to determine well candidate criteria, to analyze first results, and to look for technology optimization variants.

Methods. For coning evaluation Chan’s diagnostic plots and well flow profile were used.

Results. The pilot project has been realized in three steps, based on first step results the additional well candidate criteria has determined and methodology basis for candidate search and treatments planning has developed. During second step, treatment volumes have been varying, in third step, alternative composition has been approved and repeated treatments have been done. In 2019–2022 years period 26 treatments were done, all except one were successful, oil rate increment and watercut reduction were obtained. Additional oil production due to pilot project realization is more than 120 000 tons.

Conclusions. Authors showed results of three years water coning prevention treatments pilot project, determined success well candidate criteria and estimated additional oil production.