基于井筒离散模型的多元热流体吞吐机理

doi:10.7657/XJPG20200312

摘要/Abstract

摘要：

海上稠油油藏在多元热流体多轮次吞吐后,产量明显递减,开发效果变差。由于缺乏对多元热流体吞吐机理的认识,很难提出吞吐后开发调整的有效措施,有必要对水平井多元热流体吞吐开发机理进行研究。采用数值模拟方法,优选出井筒离散模型,通过与热水吞吐对比,剖析了多元热流体吞吐过程。结果表明,考虑多元热流体变质量流动影响以及井筒与地层耦合作用的井筒离散模型,能更真实反映稠油油藏水平井多元热流体吞吐的温度场和黏度场变化。井筒离散模型下的多元热流体吞吐模拟结果表明,沿水平井加热范围呈“长勺”状,且气液分离导致降黏范围逐渐增加。多元热流体吞吐通过热气复合降黏、扩大波及系数、气体辅助重力泄油和提高热效率,达到提高采收率的目的。

关键词: 渤海, 稠油油藏, 多元热流体, 吞吐机理, 水平井, 井筒离散模型, 数值模拟, 提高采收率

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

中图分类号:

TE345

张娜, 朱元芮, 祝仰文, 李金潘, 魏翠华. 基于井筒离散模型的多元热流体吞吐机理[J]. 新疆石油地质, 2020, 41(3): 332-336.

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.

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