Hot water huff and puff (HWHP) technology is an effective means to improve the recovery factor (RF) of the tight volcanic reservoir, but the oil recovery effect still needs to be further optimized. In this paper, taking a staged fracturing horizontal well in a tight volcanic reservoir as the object, the influencing factors and optimal design of construction parameters in the process of HWHP were studied by numerical simulation. The results show that the oil production of HWHP is positively correlated with water injection volume (WIV), water injection pressure(WIP), huff and puff cycles(HPC), well soaking time(WST), and fracture density(FD), and negatively correlated with water injection rate(WIR) and water reinjection pressure(WRP). The weight of influencing factor of HWHP from large to small is WRP, FD, HPC, WIV, WIR, WIP, and WST. The best combination of construction parameters of HWHP for a single fractured well in a tight volcanic reservoir is that the FD is 36, WIV is 15000 m3, WIP is 50 MPa, WIR is 300 m3/d, WST is 30 d, HPC is 5, and WRP is 5 MPa. This research can provide an important basis for improving the RF of the HWHP in a tight volcanic reservoir.
Keywords tight volcanic reservoir; HWHP; influencing factors; parameter optimization; numerical simulation