Scale control for Deep Water Oil and Gas Production in Ultra-high-Temperature/ Ultra-high- Pressure Wells

摘要

Dcepwater oil and gas production is expected to increase rapidly in the near future with ultra-deep frontiers being the next big challenge for India. In ultra HT/HP deepwater environment, scale control during oil and gas production is often challenging not only because of the geological and mechanical limitations associated with deepwater wells, but also because of high temperature (>200 °C) and high pressure (>20,000 psi) environment, which may be associated with brine containing high TDSs (>300,000 mg/L). These extreme conditions make scale prediction, control, and testing difficult because of the requirements for special alloys, pumps, and control equipment that are not readily available. At these conditions, the thermodynamics and kinetics of scaling minerals, such as barite, calcite and gypsum needs to be accurately estimated. This paper will discuss an efficient flow loop method to study the solubility of scale minerals at ultra HT/HP conditions, scale control and inhibitor selection for deepwater oil and gas production.