Design and Evaluation of Compound Chemical Scale Remover

Abstract

Scale deposition, including organic and inorganic substances, is always found in oil and gas field due to the changes of environmental factors in production. As a result, it is puzzled by the formation damage and wellbore plug. In fact, many wells face to complex scale, and even it is difficult to identify the type. In order to simplify treatment and promote efficiency, it is necessary to develop combining scale remover. A compound chemical scale remover is designed to relieve the complex scale comprised of calcium carbonate, guar gum and paraffin. Inorganic scale removing efficiency, paraffin removing rate and viscosity reduction ratio are used to determine the main agents respectively. Surfactants and lacquer solvent are added to develop an emulsion solution due to the incompatibility of water solution and organic solvent. This formula can dissolve 72.58% weight of calcium carbonate, reduce the viscosity of guar gum to 2.736mPa×s and remove the paraffin with a rate of 0.018 g/min.

Comprehensive Design and Manufacturing Solutions for Sand Control and Tooling towards Enhanced Oil Recovery

“…First, scale deposition always results in formation damage, wellbore plugging and corrosion. This eventually decreases oil exploitation efficiency and increases expensive investment [29]. Second, the cost of scale buildup can be high, both in terms of deferred production and necessary remedial treatments.…”

“…Second, the cost of scale buildup can be high, both in terms of deferred production and necessary remedial treatments. Third, scale growth may prevent fluid inflow, and as consequence oil production falls [29], [30].…”