Multiple Thermal Fluid Huff-Puff Mechanism Based on Discrete Wellbore Model

doi:10.7657/XJPG20200312

Abstract

Abstract:

After several cycles of multiple thermal fluid huff-puff, the oil production of onshore heavy oil reservoirs decreased significantly, and the development effect became worse. Due to the lack of understanding of the mechanism of multiple thermal fluid huff-puff, it is difficult to propose effective adjustment strategy after multiple thermal fluid huff-puff and it is necessary to further clarify the development mechanism of the multiple thermal fluid huff-puff in horizontal wells. The paper optimizes discrete wellbore models by using numerical method and analyzes multiple thermal fluid huff-puff process by comparing with hot water huff-puff. The results show that the discrete wellbore model considering the influence of variable mass flow of multiple thermal fluid and the coupling between wellbore and formation can better reflect the changes of temperature field and viscosity field of multiple thermal fluid huff-puff in horizontal wells in heavy oil reservoirs. Based on the simulation results of the multiple thermal fluid huff-puff with the discrete wellbore model, it can be found that the heated area along the horizontal well is in the shape of a “long-spoon”, and the viscosity reduction area has been expanded gradually due to gas-liquid separation. The multiple thermal fluid huff-puff technology combines multiple mechanisms such as heat-gas compound viscosity reduction, increasing sweep coefficient, gas-assisted gravity drainage and improving heat efficiency and the recovery factor has been improved.

Key words: Bohai, heavy oil reservoir, multiple thermal fluid, huff-puff mechanism, horizontal well, discrete wellbore model, numeri- cal simulation, EOR

CLC Number:

TE345

ZHANG Na, ZHU Yuanrui, ZHU Yangwen, LI Jinpan, WEI Cuihua. Multiple Thermal Fluid Huff-Puff Mechanism Based on Discrete Wellbore Model[J]. Xinjiang Petroleum Geology, 2020, 41(3): 332-336.

Figures/Tables 6

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