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Feasibility study on the reduction of hydrostatic pressure in a deep-water riser using a gas-lift method.

机译：利用气举法降低深水立管静水压力的可行性研究。

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摘要

Recent successful exploration efforts in deep waters have heightened interest in developing oil and gas reservoirs on the continental slope. Leases have been obtained in water depths up to 10,000 ft with a requirement that they be drilled within the next decade. Use of current techniques to drill these leases will require extremely large floating drilling units and large diameter marine riser systems.; This study presents the results of a feasibility study on the use of an automated gas-lift system for a marine riser that will maintain the hydrostatic pressure in the subsea well-head equal to that of the sea water at the sea floor. Hydrostatic control of abnormal formation pressure could still be maintained by a weighted mud system that is not gas-cut below the sea floor. Such a dual density mud system could reduce drilling costs by reducing the number of casing strings required to drill the well and so reducing the time required to drill a deep-water well. The system would have the advantages of riserless drilling without giving up the well control advantages of a closed, weighted mud system.; A steady-state numerical model was developed that can be used to determine the gas injection requirements needed to achieve a desired dual density configuration. The numerical model was verified through tests conducted in a 6,000 foot research well. Once verified, the model was used to define the gas requirements and practical limits of a marine gas-lift system based on estimated additional costs of gas compression and nitrogen membrane filters.; The practical limits are presented in terms of maximum mud density, water depth, and riser diameter combinations. The dissertation also discusses the operational changes that would be required for various drilling procedures such as making a connection, running casing, kick detection, and well control operations.
机译：最近在深水领域成功进行的勘探工作引起了人们对在大陆斜坡上开发油气藏的兴趣。已在水深达10,000英尺的地方获得了租赁，要求在未来十年内进行钻探。使用当前的技术来钻探这些租赁，将需要非常大的浮动钻探单元和大直径的海上立管系统。这项研究提出了一项关于为海上立管使用自动气举系统的可行性研究的结果，该系统将使海底井口的静水压力与海底海水的压力相等。仍可通过未在海底以下进行气割的称重泥浆系统来维持对异常地层压力的流体静力控制。这种双密度泥浆系统可通过减少钻井所需的套管柱数量，从而减少钻井成本，从而减少钻井成本。该系统将具有无立管钻井的优点，而不会放弃封闭式加重泥浆系统的井控优势。开发了稳态数值模型，该模型可用于确定实现所需的双密度配置所需的气体注入要求。通过在6,000英尺的研究井中进行的测试对数值模型进行了验证。一旦得到验证，该模型将根据气体压缩和氮气膜过滤器的估计额外成本，用于定义船用天然气举升系统的气体需求和实际限制。实际极限以最大泥浆密度，水深和立管直径组合的形式给出。论文还讨论了各种钻井程序所需的操作变化，例如进行连接，下套管，踢井检测和井控操作。

著录项

  • 作者

    Lopes, Clovis Antonio.;

  • 作者单位

    Louisiana State University and Agricultural & Mechanical College.;

  • 授予单位 Louisiana State University and Agricultural & Mechanical College.;
  • 学科 Engineering Petroleum.; Operations Research.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 171 p.
  • 总页数 171
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;运筹学;
  • 关键词

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