This paper describes the development, design, lab and field testing of a new generation rotary shouldered connection for BHA components. Originally pursued to enable data transmission through the BHA, this new connection further provides a dramatic increase in fatigue resistance to cyclic loads. Additional benefits from the optimized design are gained in handling and repair performance. Lab results from resonant bending fatigue tests are discussed. Successful results from the industry's first field trials of these new connections are also provided. The paper describes a critical field application where the new BHA connection has been selected to provide advanced fatigue resistance. The paper further illustrates how the connection may be used in the harshest fatigue environments to minimize risk of failure and improve well economics.

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