In recent years, some platform Wells in the Fengnan 4 well area of Xinjiang Oilfield have adopted the zipper fracturing technology in the production process, which causes the change of pore pressure near the wellbore, and then leads to the complex distribution of ground stress around the well, and increases the risk of casing deformation. Therefore, this paper considers different fracturing technology of platform wells, such as sequential fracturing of platform wells and alternating fracturing, and zipper fracturing, establish corresponding numerical models, analyzes the evolution law of pore pressure around the well, and compares and analyzes the influence of different fracturing processes on pore pressure around the middle well of the platform. The results show that the pore pressure is circularly distributed with the fracturing stage as the center during the fracturing process, and the pore pressure decreases as the distance from the center increases. During the fracturing process of the platform wells, the pore pressure diffusion regions of adjacent wells will gradually connect and influence each other. All fracturing technologies have a cumulative increase effect on pore pressure around intermediate well, and the effect of alternating fracturing in platform Wells is the most significant. The results of this study lay a foundation for the study of the variation of in-suit stress around the well during the fracturing process of the platform wells.
Multi-stage fracturing of horizontal Wells is a key technology for the economic exploitation of shale oil and gas. By "breaking" the reservoir as much as possible, a large and complex fracture network is formed to maximize the production of a single well (Jiang, 2014; Chen, 2016; Jiang, 2017; Li, 2013). With the spread of the "well factory" model, simultaneous fracturing techniques using alternating fracturing of two or even three wells, zipper fracturing, and cross-zipper fracturing techniques optimize the sequence and location of fracturing have been developed to further improve fracture complexity and reservoir reconstruction volume (Rafiee M, 2012; Waters G, 2009).
