Design of a Surfactant/Polymer Process in a Hard Brine Context: A Case Study Applied to Bramberge Reservoir

Abstract

Bramberge reservoir is a low temperature (40°C), high permeability (∼1 Darcy) sandstone reservoir located in Germany. Waterflooded during several decades, oil production has been declining for the past few years. These conditions make this reservoir a good candidate for surfactant-polymer flooding. Despite favourable attributes, the use of production brine, which exhibits very high hardness, as a re-injection fluid makes this project challenging and unique. In this paper, we illustrate how this specific hurdle can be managed using a new strategy specifically developed for hard brines. We show that surfactant/polymer formulations can be optimized in Bramberge re-injection brine despite its hardness with adequate properties for SP flooding (ultra-low interfacial tension and good solubility). The high level of divalent ions, and especially calcium ions, makes alkalis irrelevant for this project. We demonstrate using coreflood experiments that conventional injection strategies, successfully applied in soft brines (salinity gradient, etc…), and brine management options fail in these specific conditions because of the high chemicals adsorption. This high adsorption is showed to be strongly related to divalent ions. We finally propose a successful alternative based on a careful selection of adsorption inhibitors. Using these additives, high oil recovery (94 %OOIP) was obtained together with low anionic surfactant and polymer adsorption. The overall technical performance is in line with conventional alkali-surfactant-polymer strategy in soft brine making this project very attractive and promising. The process is currently in an optimization phase for pilot and field scale simulations allowing technical and economical optimization.

Review of surfactant-assisted chemical enhanced oil recovery for carbonate reservoirs: challenges and future perspectives

“…More recently, adsorption inhibitors and sacrificial agents are also proposed by many researchers to mitigate the adsorption problems (Tabary et al 2012;ShamsiJazeyi et al 2014a, b;Delamaide et al 2015;He et al 2015;Tay et al 2015). These are chemicals which preferentially adsorb on the surface thereby reducing the chances of adsorption of expensive surfactants.…”

Status of surfactant EOR technology

“…Many new surfactants are developed in laboratories in China which are presented in our database. For surfactants used in hard brines, use of adsorption inhibitors was proposed byTabary et al (2012).…”

Surfactant Flooding in Challenging Conditions: Towards Hard Brines and High Temperatures

“…The use of adsorption inhibitors as a realistic way to manage adsorption in hard brines was recently proposed (Tabary, 2012). The use of adsorption inhibitors as a realistic way to manage adsorption in hard brines was recently proposed (Tabary, 2012).…”

“…For hard brines, promising adsorption inhibitors (Tabary, 2012) were selected based on their impact on adsorption reduction of low-IFT surfactants using static adsorption tests (crushed rock). The performance of the most efficient products was assessed using dynamic adsorption tests (single phase flow and subsequent effluent titration).…”

“…However, when considering more challenging conditions, performance of surfactant flooding can drastically decrease using conventional strategies (Tabary, 2012). However, when considering more challenging conditions, performance of surfactant flooding can drastically decrease using conventional strategies (Tabary, 2012).…”