Thread compounds are used for three distinct purposes: – to prevent corrosion of the connection parts during storage; – to facilitate the running of connections during make-up/break-out; – to seal the helical paths in the thread profile of tapered interference fit thread seals To serve the first purpose, storage compounds were developed. These compounds can … Connection Thread compounds

Threaded casing connections utilise three basic mechanisms to establish a leak tight joint. These mechanisms are: tapered interference fit thread seal; metal-to-metal seal; resilient seal. 1 Tapered interference-fit thread seal Tapered interference fit thread seals, such as the API round and API buttress threads, are not inherently leak tight, but have helical leak paths included … Connection sealing

This article addresses the possible loads on a connection and its sealing and structural capacity. It should be highlighted that these capacities do not always produce the same value. 1 Imposed loads In general a connection is subjected to two types of load: Make-up load: Making up the parts will impose stresses in the connection. … Reliability and structural integrity of connections

Casing connections should satisfy several functional and operational requirements which are presented in this article. Functional aspects to provide a leak resistance to internal or external fluid pressures to have sufficient structural rigidity to transmit externally applied loads to have good geometry in order not to increase the outer diameter or reduce the inner diameter … Connection types

In order to ensure the functional efficiency of a connection, even after multiple make-up operations, surface treatments are applied to the box, the pin or to both. The surface treatments are applied to improve: the resistance to galling; the sealing capability; the resistance to corrosion. Below the effect of the different surface treatments on these … Connections Surface treatments

The general accepted method for the qualification of casing connection designs is, at the moment, the conducting of tests on a number of full scale specimens. The aim of such an investigation is to assess the following primary characteristics: the galling tendency; the sealing capacity, the structural load bearing capacity. Qualification Tests The tests to … Connections Testing and qualification

Before casing joints are installed in a well, they are exposed to a variety of harsh conditions during transport, handling and storage. The threaded pipe ends frequently have to withstand accidental impact loading during shipment from the mill to the wellsite and once at the wellsite, during handling, cleaning and running into the hole. In … Casing Thread protectors

When selecting a casing connection the actual load on the connection should be compared to the connection’s capacity. This is applicable for all types of wells: exploration, appraisal and development wells. ·Design load: The load can be derived from the same design loads as laid down for the complete casing string.With respect to the strength … Connections Selection and ordering

This article present friction factors for typical Casing Thread Compounds. Thread Compounds Friction Factors Bestolife 270 1.00 Houghton Stap Pb6 1.00 Houghton Joint No. 1 1.00 Jet/Lube Tef Kote 1.00 Jet-Lube API Modified 1.00 Jet-Lube Polar 1.00 Molykote HCS (M0S2) 1.00 Shell API Modified Compound 1.00 Shell France Modified Thread Compound 1.00 Shell Myrina S7715 … Casing Thread Compounds Friction Factors