Premium Connections

C-FER has been performing premium connection evaluation and qualification testing to ISO 13679:2002  since 2003 and also has considerable experience with both FDIS/ISO 13679:2011 and API RP 5C5:2017.

C-FER is one of a select few independent laboratories worldwide capable of executing test programs to these test protocols from CAL I for connections in relatively simple, low-consequence loading environments all the way to CAL IV for critical applications where gas-tight sealability of the...

Presentation Outline

Tahiti field deepwater environment

Loading conditions and connection performance issues

Extreme-load connection qualification tests - tubing and drill pipe

Analytical and experimental evaluation of vacuum insulated tubing (VIT)string

Summary

 

Abstract

One of the most important functions of a tubular connection is sealability. This is especially the case for premium connections which are commonly used in the demanding conditions of HPHT and Thermal Well applications.  Sealability therefore also is one of the most important criteria used during connection qualification in which the capability of the connection is verified for the characteristics of the application.  During qualification tests it has been found that breakdown in...

Summary

One of the most important functions of a tubular connection is sealability. This is especially the case for premium connections that are commonly used in the demanding conditions of high-pressure/high-temperature (HP/HT) and thermal-well applications. Sealability, therefore, also is one of the most important criteria used during connection qualification in which the capability of the connection is verified for the characteristics of the application. During qualification tests, it has...

The Industry Challenge

HPHT wells often encounter sour and corrosive operating conditions where hydrogen sulfide, carbon dioxide and high salinity formation water can severely impact the integrity of premium casing and tubing connections. Existing testing facilities cannot simultaneously expose representative, large diameter specimens to the combination of chemical environment and loading conditions that occur in these wells.

The project will establish a new facility where large-scale, high load...

The Industry Challenge

Collapse tests on 9-5/8” well casing specimens at 180°C show a marked decrease in collapse resistance. At present, testing facilities are not capable of testing larger diameter specimens that are representative of common well configurations at elevated temperatures.

The project would establish a high pressure (up to 40,000 psi), high temperature (up to 300°C) testing facility for large scale well casing and downhole equipment.

For more information contact Kirk Hamilton at...

The Industry Challenge:

Operators require gas tight connections for a variety of applications including thermal, HPHT and tight oil wells. Premium connections that incorporate a metal-to-metal seal near the nose of the casing pin end can provide this level of seal performance.

Premium connections do not follow a specific design code so their performance can vary considerably among manufacturers and even among different casing sizes.

Conventional torque-turns measurements during connection...

The Industry Challenge:

As operators develop challenging applications (e.g. deepwater reservoirs), they require well completions that must operate beyond normal temperature and pressure ranges.

The complex interaction of load, temperature, pressure and environmental conditions make it difficult to design and verify the performance of new equipment using conventional design calculations or modeling.

In some cases, advanced design methods such as strain-based design are required to accommodate the...

The Industry Challenge:

Steam Assisted Gravity Drainage (SAGD) requires complex well designs and completion configurations to ensure that steam can be delivered efficiently throughout the reservoir interval.

Conventional well completion approaches use multiple injection strings in “toe and heel” configurations to provide multi-point steam injection along the horizontal section of the wellbore.

The flow dynamics of these multi-string completions are extremely complicated due to heat transfer...

The Industry Challenge:

Premium connections are considered proprietary designs for casing and tubing connections offered by a variety of Vendors that use various connection design approaches to achieve high levels of seal integrity and structural strength.

The operating conditions in thermal and HPHT operations can vary significantly due to well depth, well geometry and operating temperature which makes it difficult for operators to determine which premium connection type is best suited to an...