Drilling

Field Experience: Diagnosing a BHA Washout During a drilling operation, a gradual reduction in SPP was observed, eventually reaching 500 psi. After monitoring the trend and evaluating possible causes, the decision was made to POOH and inspect the drill string and BHA for signs of a washout. Upon inspection, a significant washout was found at the connection between the string stabilizer pin (upper component) and the float sub box (lower component), as shown in the attached photos. Based on the washout geometry visible on both components, which failure mechanism do you believe occurred first? Scenario 1: The float sub box developed a crack or defect first, initiating the washout and subsequently damaging the stabilizer pin connection. Scenario 2: The stabilizer pin developed a crack or defect first, initiating the washout and subsequently damaging the float sub box connection. I am interested to hear the opinions of drilling, L/MWD, directional drilling, and drilling tool specialists. Which scenario would you support, and what evidence from the washout pattern leads you to that conclusion? ✍ Credit