**3. Engineered completion using surface drilling-derived logs in every unconventional well**

 Production diagnostic tools have time and time again confirmed the variable performance of stimulated stages, prompting the need to geoengineer completions to adapt the treatment to the variable nature of the stress and rock properties along the wellbore. Fortunately, the use of surface drilling data leads to the estimation of key rock property logs, minimum stress and CMSE that could be used as a reference log to geoengineer the different hydraulic fracturing stages. The objective is to set the stages and the clusters in rock with similar fracture gradients, so they break at a common treating pressure. **Figure 3** shows a well that has benefited from the use of the CMSE derived from surface drilling data and the variable reference log used to geoengineer the completion. When starting with a geometric design an initial cluster efficiency of 62% is computed along the wellbore. As shown in **Figure 3** in the two red rectangles, minor changes in the position of the stages and their clusters could increase the cluster efficiency to 70%. Current applications of this technology to various wells have shown a consistent increase from 10 to 30% of cluster efficiency when using the logs derived from surface drilling data. Fiber optic measurements have confirmed the ability of these surface drilling derived logs to predict the cluster efficiency within a reasonable engineering error. While fiber optic measurements are extremely rare and very expensive, on the order of a million dollars, the logs derived from surface drilling are available at every well at an insignificant cost.

Given the density of unconventional wells, this newly available information provides the opportunity to go beyond the wellbore and start propagating this wellcentric information into a 3D representation of the reservoir.

### **Figure 3.**

*Using a surface drilling derived reference log to geoengineer completions by moving stages to target similar rock, increasing cluster efficiency.* 

*Surface Drilling Data for Constrained Hydraulic Fracturing and Fast Reservoir Simulation… DOI: http://dx.doi.org/10.5772/intechopen.84759* 
