Researching the mineralized deposition of BPEI-MTM and its application in enhancing wellbore stability

The shale reservoir consists mainly of mud shale, characterized by its unique physical and chemical properties, extensive bedding, and micro-cracks. As a result, it is susceptible to hydration and dispersion, leading to the instability of the wellbore during drilling. To address this issue, chemical or physical methods are necessary to enhance the wellbore integrity and ensure stability during the drilling process. This paper focuses on simulating the biomimetic mineralization process to study the composite membrane structure formed by the deposition of montmorillonite and polyelectrolyte. The study investigates the reinforcement effect of the composite membrane on the wellbore wall. By examining the morphology and structure of montmorillonite and BPEI deposition films, the influence of deposition times and polyelectrolyte variations on the deposition film is analyzed. Additionally, the mechanical properties of the montmorillonite and BPEI deposition film are evaluated. The investigation also employs simulated drilling fluid circulation deposition to assess the reinforcement effect of the deposition film on the well wall. Experimental results indicate that the deposition film formed by montmorillonite and BPEI demonstrates a certain level of effectiveness in improving wellbore stability. These findings provide a solid basis for further research on process technology and offer new insights for ensuring the safety of shale oil reservoir drilling.