Coring Dynamics: Data Acquisition While Coring

摘要

The Integrated Ocean Drilling Program (IODP) has developed an 8-1/4" instrumented drill collar with a 4-1/8" I.D. for routine use in the program's global coring program. An inductive data link to an instrumented core barrel has been added to acquire coring data in both core barrel and drill collar simultaneously while coring. The project consists of two independently engineered systems that interface downhole to exchange data and provide near real-time measurements made at the bit. The first component is the instrumented drill collar that measures weight-on-bit (WOB), torque-on-bit (TOB), annulus pressure, bore pressure, and annulus temperature at 1 Hz. The second component is the retrievable memory module which includes pressure and acceleration measurements and the data link system required to retrieve and store the data from the instrumented drill collar. The memory module can be fastened to the top of all standard IODP core barrels and will record the drilling dynamic data, while coring, via the inductive data link. The memory module and core barrel are returned to the rig floor using conventional wireline coring techniques which do not consume any additional rig time. Field testing has demonstrated that the concept is viable and that data can be reliably transmitted through the data link while coring.