Three-Level System to Determine and Correct Real Time Drillstring Vibration

Abstract This paper aims to identify the impact of parameters: Rate of Penetration (ROP), Torque, and Weight on Bit (WOB) on the Specific Mechanical Energy (MSE). This concept has been implemented to evaluate bit performance, determine drilling efficiency, and analyze if the bit adequately utilizes the energy and is not dissipated elsewhere (vibration). However, MSE alone does not differentiate between the causes of inefficiency and additional energy used in drilling. Various studies have analyzed this parameter along with the MSE/DS (MSE/Drilling Strength) ratio to determine if drilling inefficiency is due to rock hardness, vibrations, bit wear, or bit balling (Raul Flores, CMP 2024). Continuing with the study, we have the following: A three-way protocol to determine and correct drill string vibration is presented with a simplified methodology. When using the original MSE equation, there are two terms: torsional load and axial load. Studies concluded that the axial load can be omitted, yielding the same result. Also, in terms of trend analysis, MSE behaves the same over the drilling time. The MSE/DS ratio led us to a simplified equation called the Ratio Factor (RF), a quick-to-calculate optimized factor. The RF is the ratio between the rotational forces and the normal axial forces on the bit. 3 case studies are shown, where based on the behavior of the MSE and the RF, the problems presented were identified and corrected, Well 1: vibrations, well 2: Bit wear and well-3: Impact of the MSE values.