Acid-based cement slurry with controllable properties

Abstract

Intensive occurrence of sand related problems in wells diminishes oil flow rate and leads to heavy expenses on production and equipment maintenance. Hard geological factors on field bedding, heterogeneity of reservoir porosity and permeability, strict constraints on physicochemical property of oil and produced water restrict the efficient application of several available methods and technologies for sand control. The increasing densification of sand related problems at late stages of development gives rise to implementation of different type of workover. There exist several backfilling compositions with a number of draw-backs to control sand influx from the reservoir into the well. With the purpose to work out more effective technology to ensure the consolidation of reservoir there was developed a new grouting mortar. This slurry contains cement, hydrated aluminum silicate and 7-8% hydrochloric acid solution. Barrier of grouting mortar has high resistance and adhesive characteristics and penetrates much deeper into pores increasing consolidation efficiency.