**4.2 Re-fracturing methods**

There are many ways available to perform re-fracturing; however, three most common re-fracturing methods are selected for consideration, namely, the diversion method, the coiled tubing fracturing method, and the mechanical isolation method [43]:


As re-fracturing technology gains popularity in unconventional reservoirs, the ability to isolate reservoir access points and redirect the fracturing fluids and proppant to different parts of the reservoir is crucial to achieving a successful treatment. All known methods have advantages and disadvantages; however, the often selected method is based on their ease of use, cost-effectiveness, and environmental impact.
