Browse Prior Art Database

COMPOSITION FOR CONTROLLING THE SCALE FORMATION OF MAGNESIUM SILICATE

IP.com Disclosure Number: IPCOM000249470D
Publication Date: 2017-Feb-28
Document File: 5 page(s) / 172K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention provides a combination of a polymer, phosphonate and a complexing agent to control the scale formation of MgSiO3 effectively. It was found that there is a significant synergy between the three components. The effectiveness of the treatment requires the use of all the three components, otherwise the performance would be greatly reduced. Previously, Magnesium Silicate deposition was difficult to control. However, after the studies conducted it was found that a composition of three chemicals [(HPS-1 or STP), PBTC and EDTA)] can be used to inhibit the Magnesium Silicate deposition.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 39% of the total text.

COMPOSITION FOR CONTROLLING THE SCALE FORMATION OF MAGNESIUM SILICATE

BACKGROUND

Scaling also known as precipitation fouling is the crystallization of solid salts, oxides and hydroxides from water solutions, for example, calcium carbonate or calcium sulfate. Scaling often results from the formation of inorganic, sparingly soluble salts from aqueous brines. This constitutes one of the major flow assurance problems. Scale forms and deposits under supersaturated condition; the deposited scale adheres on the surfaces of the water handling equipments, where it builds up in time and leads to problems in reservoirs, pumps, valves, topside facilities, etc. Since the deposition/adhesion takes place also in heat transfer equipments such as boilers and heat exchangers operating with hard water, a decrease in the performance during heat exchange as well as in flow rates occurs. These problematic conditions are found not only in the oil fields but also in the distillation plants. The rapid increase of the mineral deposits leads to inevitable damage to the equipment parts. As a result, it necessitates for the recovery or replacement of damaged parts. In many industries like oil and gas production, geothermal etc., these interruptions are accompanied by extremely high costs.

Silica and/or silicate deposits are particularly difficult to remove once they form. Silica exhibits normal solubility characteristics, which increase proportionally to temperature. In contrast, magnesium silicate exhibits inverse solubility. Magnesium silicate scale typically has non-stoichiometric ratios of magnesium to silicate. Also, magnesium silicate has a higher scaling index than the other metal silicates. 

Thus there is a need for controlling the scale formation of metal silicates. The following invention provides a composition for controlling the scale formation of MgSiO3. Experiments were carried out with different combinations of various chemical compounds to determine the most suitable formulation for controlling the scale formation of Magnesium Silicate.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a table of experimental formulations and data of various chemical compounds used for inhibiting Calcium carbonate and Magnesium carbonate.

Figure 2 is a bar graph of Magnesium Inhibition test plotting Treatments versus Inhibition efficiency.

Figure 3 is table showing an interpretation of the data of Figure 2.

DETAILED DESCRIPTION

The present invention provides a composition for controlling scale formation of Magnesium Silicate. Different compositions of various substances were tested to find the most suitable formulation for controlling the scale formation of Magnesium Silicate.

The following are experimental testing conditions:

Testing conditions

A stock solution containing 20ppm Calcium as Calcium Carbonate and 20ppm Magnesium as Calcium Carbonate was prepared by dissolving appropriate amounts of Calcium Chloride Dihydrate and Magnesium Sulfate Heptahydrate in deionized water...