Oil Well Descaling - Oil Well Scale Inhibitor | Schlumberger

DeScal Service: Scale Dissolution

A portfolio of safe and field-proven scale dissolvers

PREVENT Technologies
Chemistry to mitigate production threats
PERFORM Technologies
Chemistry to achieve full field potential
CURE Technologies
Chemistry to restore full production

A portfolio of safe and field-proven scale dissolvers

When scale—mineral or elemental—has accumulated downhole, on the topsides, or on export terminals, the DeScal descaling, decontamination, and decommissioning service is the answer. Mineral scale deposition can plug the most permeable reservoir, forcing operators into a relentless and costly struggle to maintain a clear pathway to maximize production.

Together with advanced and site-specific analytical methodologies, Schlumberger provides an extensive suite of new-generation, noncorrosive, environmentally compatible scale dissolvers. As an added bonus, scale dissolvers used by the DeScal service remove the largest amounts of scale per liter, reducing overall treatment costs.

BASOL 2000 HP scale dissolver

This powerful yet nonhazardous and noncorrosive scale dissolver and sequestrant provides the optimal pH for sulfate scale dissolution.

With capacities of up to 80g/L, the converting and catalyzing agents integral to BASOL 2000 HP scale dissolver ensure rapid dissolution rates compared with other industry products.

CAL-ACID scale dissolver

The uniquely formulated CAL-ACID scale dissolver and sequestrant provides a viable, fast-acting, noncorrosive alternative to conventional mineral acid treatments for carbonate scales.

It has the same calcium carbonate scale dissolution capacity (260 g/L) as hydrochloric acid (HCl). However, it possesses an inherent sequestering capacity that prevents the reprecipitation of undesired substances, such as iron (liberated through scale dissolution), that could potentially damage the formation.

DeScal Chemical Solutions
DeScal Chemical SOlutions
Caliper and gamma readings were conducted before scale dissolution treatment to identify the location and thickness of the scale deposit (red line, gray shaded areas) and to facilitate design of the chemical treatment to remove the scale. After chemical deployment, caliper and gamma readings were again taken to confirm successful removal of barium sulfate scale (green line, black shaded areas).

GYPSOL scale dissolver

GYPSOL scale dissolver and sequestrant provides the optimal pH (7–8) to dissolve calcium sulfate scale, while retaining the ability to dissolve coprecipitated barium and strontium sulfate scales.

PYRISOL iron sulfide scale dissolver

PYRISOL scale dissolver is a unique alkaline dissolver designed to remove iron sulfide, iron oxide, and sulfur in a safe and controlled manner without the liberation of H2S.

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