The refined Mechanical Specific Energy (MSE) calculation, known as the OmniLog, is based on the original Teale equation first published in 1964. The original Teale equation defined the term Mechanical Specific Energy (MSE) as the energy required to excavate a unit volume of rock. The MSE term has been used by the drilling community for decades to define and quantify Drilling Efficiency.
MSE (psi)= Unconfined Compressive Strength* drilling efficiency
Drill2Frac has refined the original Teale equation and focused on the part of equation that describes rock properties expressed as “Unconfined Compressive Strength”. By crafting a workflow and software, Drill2Frac removes noise, artifact and “inefficiencies” common to the drilling process. What remains is the signal, the relative rock strength (hardness and softness) of individual facies along the lateral.
Simply put, rock that is easier to drill is easier to frac, rock that is harder to drill is harder to frac. Operators can use the OmniLog to identify rocks of similar strength and use these observations to refine perf clusters, design diverter strategies and optimize stage lengths.