Simulation of the Influence of Fracture Gas State on Gas-Liquid Replacement Based on Fluent Two-Phase Flow

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS
Zeng Jing, Lin Yuanhua, Zhang Dong, Xie Guangyu, Chen Qing
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引用次数: 0

Abstract

Aiming at the hazards caused by drilling into fractured formations during oil drilling, linear prediction of physical properties of CO2/H2S under different well depths are carried out, based on Fluent to simulate gas-liquid placement in near-critical, critical and supercritical states of gas. The results show that when the well depth is small, the CO2/H2S near-critical state and the initial bottom hole pressure of the critical state invading the annulus are lower than the formation pressure, and the gas invading the annulus is suspended in the annulus until the hydrostatic pressure of the missing drilling fluid is supplemented for about 1s and 1.2 s respectively, the formation pressure can be balanced before the upward return can be continued; the bottom hole pressure of the supercritical state invades the annulus rapidly drops within 2 s; the gas-liquid replacement rate in the supercritical state is slower than that in the non-supercritical state, with a difference of 60-80 s. During the drilling process, it can be judged according to the bottom hole pressure change whether it has encountered a fractured formation and the state of the gas contained, and well control measures should be taken in time.

Abstract Image

基于流体两相流的断裂气态对气液置换的影响模拟
针对石油钻井过程中钻进裂缝地层造成的危害,基于 Fluent 模拟气体的近临界、临界和超临界状态,对不同井深下 CO2/H2S 的物性进行了线性预测。结果表明,当井深较小时,CO2/H2S近临界状态和临界状态侵入环空的初始孔底压力低于地层压力,侵入环空的气体悬浮在环空中,直到缺失的钻井液静水压力得到补充,分别约为1s和1.在钻井过程中,根据底孔压力变化可判断是否遇到裂缝地层及含气状态,及时采取井控措施。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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