He, Youwei (China University of Petroleum, and Texas A&M University) | Cheng, Shiqing (China University of Petroleum) | Qin, Jiazheng (China University of Petroleum) | Tang, Hewei (Texas A&M University) | Chai, Zhi (Texas A&M University) | Wang, Yang (China University of Petroleum) | Chen, Zhiming (China University of Petroleum) | Yu, Haiyang (China University of Petroleum) | Killough, John (Texas A&M University)
High water-cut has been observed for many multi-fractured horizontal wells (MFHWs) in China soon after waterflooding begins. Available well-testing models of single well ignored the effect of adjacent wells on the MFHW, and they are unable to evaluate whether MFHW (producer) and surrounding vertical wells (injectors) are in good pressure communication. To fill this gap, this work presents a multi-well interference testing (MWIT) model to consider the interference of injectors and further match the interference pressure data.
The MWIT model is established to investigate the effect of multiple injection wells on transient-pressure behavior of the MFHW. Due to the interferences from injectors, the pressure and pressure-derivative curves of MWIT move down beginning with the biradial flow regime for single MFHW model, and pseudo-radial flow (horizontal line with the value of 0.5 on pressure-derivative curve) disappears. Sensitivity analysis was conducted to discuss the effects of crucial parameters on the pressure response, including total injection rates, unequal injection rates of injectors, well spacing, injector distribution, number and production of hydraulic fractures. When total injection rates are lower than the production rate, the pressure derivative will eventually stabilize at 0.5*(1-Σ(