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• W4231103404 abstract "DST Design for Deepwater Wells with Potential Gas Hydrate Problems Shing-Ming Chen; Shing-Ming Chen Husky Energy Search for other works by this author on: This Site Google Scholar William Xiaowei Gong; William Xiaowei Gong Husky Energy Search for other works by this author on: This Site Google Scholar Geoff Antle Geoff Antle Husky Energy Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore Technology Conference, Houston, Texas, USA, May 2008. Paper Number: OTC-19162-MS https://doi.org/10.4043/19162-MS Published: May 05 2008 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Chen, Shing-Ming, Gong, William Xiaowei, and Geoff Antle. DST Design for Deepwater Wells with Potential Gas Hydrate Problems. Paper presented at the Offshore Technology Conference, Houston, Texas, USA, May 2008. doi: https://doi.org/10.4043/19162-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsOffshore Technology ConferenceOTC Offshore Technology Conference Search Advanced Search AbstractThe main objective of this paper is to present a proper DST design for deepwater gas wells with potential gas hydrate problems because of low seabed temperature.Prior to discussing the DST procedures, the importance of selecting a proper mud for drilling and interval for testing are explained. Factors affecting gas hydrate formation are discussed. Then, requirements for gas hydrate prevention during DST are described. Actions required to prevent gas hydrate formation during DST startup, fluid sampling, well shut-in and restart are addressed. Finally, procedures for incorporating gas hydrate prevention in DST are outlined.At the end of the paper, a gas well with hypothetical data is used to assist in illustrating the DST procedures.IntroductionHydrates are physical combinations of water and natural gas formed at pressures and temperatures considerably above the freezing point of water[1-5]. For deepwater gas wells, the risk for gas hydrate formation always exists due to the low seabed temperature and the coexistence of gas and water inside the wellbore.Figure 1 shows one of the popularly used pressure-temperature-gas density correlations for gas hydrate predictions[2,6]. As it can be seen from this figure, the generally low temperature of less than 50 0F in the deepwater seabed, together with the normal gas well operating pressure of several hundreds to thousands of psi, will result in wellbore temperatures below the gas hydrate temperature curve.DST and Gas HydrateAlthough a deepwater gas well may be operated at certain flow conditions to take advantage of the warm fluid coming out from the reservoir, the need for DST to shut in the well for pressure buildup tests or produce the well at low rates for fluid sampling often cool the fluid inside the wellbore to the extent that gas hydrate will form. For the deepwater DST, it has been well recognized that hydrate prevention is needed for flow assurance in order to complete the test[7-11]. Keywords: dst design, upstream oil & gas, drillstem testing, buildup test, gas well, hydrate prevention, offshore technology conference, drillstem/well testing, requirement, wellbore Subjects: Formation Evaluation & Management, Drillstem/well testing This content is only available via PDF. 2008. Offshore Technology Conference You can access this article if you purchase or spend a download." @default.
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• W4231103404 title "DST Design for Deepwater Wells with Potential Gas Hydrate Problems" @default.
• W4231103404 doi "https://doi.org/10.2118/19162-ms" @default.
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