Interference Analysis of Shale Gas Horizontal Wells Considering Magnetic Azimuth Correction

Abstract

In order to analyze the interference risk of shale gas horizontal wells, a model is established to analyze the interference domain in shale gas horizontal wells. With this model, the borehole uncertainty and the fracturing interference domain can be coupled reasonably. To reduce borehole uncertainty and further reduce the interference domain, the multi-station analysis (MSA) is employed to correct the magnetic azimuth of the shale gas horizontal wells. The interference domain of a shale gas horizontal well was studied. With magnetic azimuth correction, the semimajor axis of ellipse of borehole uncertainty (EOU) decreases from 23.10 m to 19.48 m (lateral) at the measure depth of 5671.60 m. And the edge length of the interference domain decreases from 206.20 m to 198.96 m. The results show that, magnetic azimuth correction based on MSA can reduce the interference domain and interference risk. And this analysis method can provide a theoretical reference for avoiding interference in shale gas horizontal wells.