Zeng Jing, Lin Yuanhua, Zhang Dong, Xie Guangyu, Chen Qing
{"title":"Simulation of the Influence of Fracture Gas State on Gas-Liquid Replacement Based on Fluent Two-Phase Flow","authors":"Zeng Jing, Lin Yuanhua, Zhang Dong, Xie Guangyu, Chen Qing","doi":"10.1007/s10553-024-01642-9","DOIUrl":null,"url":null,"abstract":"<p>Aiming at the hazards caused by drilling into fractured formations during oil drilling, linear prediction of physical properties of CO<sub>2</sub>/H<sub>2</sub>S 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 CO<sub>2</sub>/H<sub>2</sub>S 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.</p>","PeriodicalId":9908,"journal":{"name":"Chemistry and Technology of Fuels and Oils","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemistry and Technology of Fuels and Oils","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s10553-024-01642-9","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
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.
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.