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首页> 外文会议>Deepwater reality - ultradeep potential >Well Design With Expandable Tubulars Reduces Costs and Increases Success in Deepwater Applications
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Well Design With Expandable Tubulars Reduces Costs and Increases Success in Deepwater Applications

机译：具有可扩展管状结构的油井设计可降低成本并提高深水应用的成功率

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Optimizing the casing program is one of the most critical factors in well design for deepwater applications. Conventionalrndesign often dictates that very large surface casing be used to allow passage of a high number of subsequent casing stringsrntelescoping down in size that are required to reach and penetrate target zones. The large casing, the larger surface facilitiesrnneeded to handle the large casing, and the greater level of services needed to support drilling and completion of these largerrnholes increases exploration and field-development costs significantly. In ultra-deep drilling projects, a conventional design mayrnrequire so many casing strings to reach the target zones that no additional strings are available should unexpected situationsrnoccur, such as sloughing, high pressure or lost circulation. Reaching the target zones may then become impossible, andrnpotential production from the well may be severely reduced or completely unobtainable.rnThe value of a revolutionary new technology, expandable tubulars, in reducing well costs and ensuring drilling success forrndeepwater applications has been commercially proven. With this technology, an expansion device known as the expansionrncone is propagated through a new string of downhole tubulars to expand the tubulars. An expandable hanger anchors thernexpanded string to the previous string.rnBecause an expanded string and hanger require less hole size for placement than a conventional string and hanger, smallerrninitial hole sizes and casing strings can be used to reach the target zone with the same size string as a conventional installation.rnThus, appreciable cost savings can be realized. Alternatively, rather than to reduce the size of the initial hole and subsequentrnstrings, the conservation in hole size afforded by expandable tubulars can be (1) reserved for additional strings that might bernnecessary for contingency operations or (2) used to increase the size of the final production tubulars thus allowing a significantrnincrease in production flow rates. Hence, wells may be saved that might otherwise be abandoned. Clearly, well designs thatrnutilize expandable tubulars can help reduce costs and increase success in deepwater applications.rnThe paper discusses this new technology and gives examples of commercial installations of expandable tubular systems.rnThese examples illustrate the value of including expandable tubulars in well designs and how these designs can be applied inrndeepwater drilling.
机译：在深水应用井设计中，优化套管程序是最关键的因素之一。传统的设计通常要求使用非常大的表层套管以允许大量的后续套管柱通过，从而减小并达到并穿透目标区域所需的尺寸。大型套管，处理大型套管所需的大型地面设施以及支持这些较大钻孔的钻探和完井所需的更高水平的服务显着增加了勘探和现场开发的成本。在超深层钻探项目中，常规设计可能需要很多套管柱才能到达目标区域，以防万一出现意外情况（例如泥石流，高压或井漏），没有额外的套管柱可用。然后到达目标区域可能变得不可能，并且井的潜在生产可能会严重减少或完全无法获得。革命性的新技术，可膨胀管材在降低井成本和确保深水应用中成功钻探方面的价值已得到商业证明。利用这种技术，称为膨胀锥的膨胀装置通过新的井下管柱串传播以使管膨胀。可膨胀的衣架将膨胀的绳子锚定到先前的绳子上。由于与传统的绳子和衣架相比，膨胀的绳子和衣架需要的孔尺寸较小，因此较小的孔和套管柱可用于与尺寸相同的绳子到达目标区域传统安装。因此，可以节省大量成本。替代地，不是减小初始孔和随后的管柱的尺寸，而是可保留由可膨胀管提供的孔尺寸的保留（1）预留给应急操作可能需要的附加管柱，或者（2）用于增加管柱的尺寸。最终生产管材，从而大大提高了生产流速。因此，可以保存井，否则可以将其丢弃。显然，利用可膨胀管的井设计可以帮助降低成本并提高深水应用的成功率。本文讨论了这项新技术，并举例说明了可膨胀管系统的商业安装。这些示例说明了在井设计中包括可膨胀管的价值以及这些方法如何设计可应用于深水钻探。

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