API 17TR8 - HPHT Design Guideline for Subsea Equipment

Abstract

This paper describes the new API guidelines being proposed to establish design methodology, material functional specifications, design validation requirements for equipment designed to operating above 15 000 psi (103.5 MPa) rated working pressure and/or 350°F (177°C) operating temperature through API 17 Technical Report TR8: High Pressure -High Temperature (HPHT) Design Guidelines. The proposed design guideline is intended to provide the wording and the reference information which can be incorporated into any of the subsea hardware specifications, standards and recommended practices within the suite of subsea API (SC 17) documents. Its intent is to be a reference cited in part or in total, by the various API subsea hardware documents, allowing them to expand their working pressure and temperature classifications without having to re-write the relevant sections into their governing documents. API 17TR8 contains detailed guidelines on new design methodology, material property requirements, design validation testing, and special requirements for seals and fasteners when considering the effects of HPHT wellbore fluids passing through subsea equipment.

Influence of CO2 at HPHT Conditions on the Properties and Failures of an Amine-Cured Epoxy Novolac Coating

“…This combination of corrosive species at a reference temperature of 180 °C and a pressure of 130 bars was simulated in an enclosed batch-like reactor (autoclave) with coated steel panels placed in the chamber (details provided elsewhere) . According to the HPHT definitions, , if any of the two parameters (temperature or pressure) are fulfilled, then the condition falls under the HPHT category. Although HPHT definitions state a pressure rating of 690 bars, the role of coating technology is more prominent in the upstream oil and gas applications, where the pressure varies from ambient to as high as 150 bars .…”

“…However, the oil and gas industries rely increasingly on wells and reservoirs operating at extreme conditions . Oil drilling at temperatures greater than 149 °C (300 °F) and/or pressures of 690 bars (10,000 psi) are classified as high-temperature and high-pressure (HPHT) wells. , Under such conditions, and in the presence of hydrocarbons, seawater, and CO 2 , the substrate (steel) corrosion rate increases, along with the risk of mechanical failures …”

Impact of High Pressures on Au-Sn Solid Liquid Interdiffusion (SLID) Bonds

“…Lead-Zirconate Titanate (PZT) is commonly used as the piezoelectric material in sensor applications such as pressure sensing or ultrasound transducers for well inspection in the oil and gas industry where temperatures and pressures are considerably high. American Petroleum Institute defines high pressure, high temperature environments as temperatures and pressures greater than 177 °C and 1030 bar, respectively [6]. The development of ultrasound transducers for operation in harsh environments is still a challenge, mainly due to thermal aging effects of the piezoelectric material and the temperature limitations of polymer materials.…”

Ultrasound Transducers for High Pressure Environments Up to 1000 Bar

“…The development of ultrasound transducers for operation in high pressure, high temperature (HPHT) environments is still a challenge, mainly due to thermal aging effects of the piezoelectric material and the temperature limitations of polymer materials. The American Petroleum Institute defines HPHT environments as temperatures and pressures greater than 177 °C and 1030 bar [1].…”