HPHT

The Industry Challenge

Operators are completing wells in increasingly challenging environments where equipment are subject to extreme pressures, temperatures, and mechanical loading. It is critical to ensure that equipment can withstand these conditions through validation testing.

API Specification 14A (2015) Annex J provides a methodology by which manufacturers/end users may verify that the SSSV hydro mechanical system functions properly at all anticipated in service loading conditions (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

A two-year comprehensive effort to design, test, manufacture, and deploy a new high-pressure completion tubular for Chevron's deep-water Gulf of Mexico operations is presented. The completion application expected harsh, aggressive loading modes and high pressures to be encountered. The major challenge was to design, test and manufacture a subsea completion string that would provide efficient hydraulics during the fracturing operations while ensuring mechanical and pressure integrity.

Re...

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 are often approached by vendors with new and improved tool designs that are designed to address specific needs for new challenging applications. This can include tools for drilling, logging and stimulation.

The combination of extreme load, pressure, flow and temperature and environmental conditions that the tool must operate in can affect the tool performance in ways that are difficult to predict.

Therefore, it is critical for the operator to confirm the...

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:

Well operators often encounter tight spots in the wellbore that impair access to the well that may prevent deployment of artificial lift systems and lead to loss of pressure integrity in the well.

Impression blocks and caliper surveys can be used to gain a better understanding of the shape of the damaged casing; however, the information gained is usually insufficient to design repair programs or modify well designs and operating practices to avoid similar failures in the...

The Industry Challenge:

Oilfield equipment in sour service, where hydrogen sulfide is present, is susceptible to hydrogen embrittlement and stress corrosion cracking.

Complex operating conditions including multi-axis and cyclic loads make it difficult to predict how the effects of the sour environment could affect the pressure and structural integrity of the equipment.

Small-scale material tests, which are used to evaluate material performance in sour environments, typically do not reproduce the...