Time Delayed and Low-impairment Fluid-loss Control using a Succinoglycan Biopolymer with an Internal Acid Breaker

Abstract

The formation damage that results from the incomplete back-production of viscous, fluid-loss control pills can be minimised if a slow acting internal breaker is employed. In particular, core-flow tests have indicated that combining a succinoglycan-based pill with a hydrochloric acid internal breaker enables a fluid-loss system with sustained control followed by delayed breakback and creates only low levels of impairment. To describe the delayed breaking of the succinoglycan/hydrochloric acid system, a model, based on bond breaking rate, has been used. With this model, it is possible to predict the change of the rheological properties of the polymer as a function of time for various formation temperatures, transition temperatures of the succinoglycan and acid concentrations. Hence, the model can be used to identify optimum formulations of succinoglycan and acid breaker on the basis of field requirements, such as the time interval over which fluid-loss control is needed, the overbalance a pill should be able to withstand and the brine density required.

Fluid loss additives

“…Succinoglycan can be degraded with an internal acid breaker [88]. The formation damage that results from the incomplete back-production of viscous fluid loss control pills can be minimized if a slow-acting internal breaker is employed.…”

Specifics of Well Killing Technology During Well Service Operation in Complicated Conditions

“…Calculation of the stress state of the rock in the near-wellbore zone based on geomechanical modeling can make a significant contribution to the optimization of well killing processes. Among the works on the assessment of the stress state in the near-wellbore zone can be distinguished (Elchin et al, 2019;Lakatos et al, 2013;Fischer et al, 1973;Dorman and Udvary, 1996;Bouts et al, 1997;Orlov et al, 1991;Musabirov et al, 2019).…”

Advances in Raw Material Industries for Sustainable Development Goals

“…The considered characteristic features of carbonate reservoirs can lead to low coverage of the formation impact, low displacement efficiency, quick well flooding, gas breakthrough, and, as a result, a rapid decline in oil production (Bouts et al 1997;Dorman & Udvary 1996;Rogachev & Strizhnev 2006).…”