Calcium Carbonate Scale Control in Geothermal Wells

Abstract

Scaling of wells represents a major problem to many geothermal power plants. Geothermal brines contain dissolved minerals that have a high tendency to precipitate in critical areas. In particular, formation and growth of calcium carbonate scales are hamtfirl to operations by restricting brine flow and causing a decrease in power generating efficiency. Removal of the scale involves laking the well o#-line and either physically or chemically removing the deposits downhole. This process restores the well eflciency but is extremely costly and time consuming.

This paper explores the technology behind how polymeric antiscalant additives eflectively and economically prevent ,downhole scale formation and allow uninterrupted eBcient power generation. Feeding methods, monitoring techniques and results from major geothermal developers in the US resource area will also be discussed. The paper was originally presenfed at one of the GRC conferences.