掘削編成降下中にトップドライブ装置でビットを冷却する新工法の経済性　　高温度地熱井での実績と高温度油井に適用した場合の予測

• 齋藤 清次

  東北大学大学院工学研究科地球工学専攻

• 佐久間 澄夫

  地熱エンジニアリング(株)

書誌事項

タイトル別名

• Economics of increased bit life in high temperature wells by cooling with Top-drive Drilling System while RIH. Field results of geothermal wells and an estimate of effects for a high temperature oil well.
• クッサク ヘンセイ コウカ チュウ ニ トップドライブ ソウチ デ ビット オ レイキャク スル シン コウホウ ノ ケイザイセイ コウオンド チネツイ デ ノ ジッセキ ト コウオンド ユセイ ニ テキヨウ シタ バアイ ノ ヨソク
• Field results of geothermal wellsand an estimate of effects for a high temperature oil well
• 高温度地熱井での実績と高温度油井に適用した場合の予測

抄録

A 540°C, 3, 729m geothermal well, WD-1A, was drilled in Kakkonda, Japan. One major issue for drilling high temperature wells was how to protect temperature sensitive downhole tools from high temperature stagnant mud while RIH (Running-in-the-hole). To solve this problem, a TDS (Top-drive-drilling-system)-Cooling-Method was developed to drill the WD-1 A well. With this method, mud was pumped continuously while running a BHA (Bottom-hole-assembly) into the hole using a TDS. To evaluate this TDS-Cooling-Method, an experiment was conducted and discovered to be very effective for cooling BHAs while RIH.<br>Bit performance for two geothermal wells, drilled with and without using the TDS-Cooling-Method, was evaluated and revealed that the TDS-Cooling-Method could prolong three-cone bit life 5times. Also, economic evaluation of using the TDS-Cooling-Method was made based on the field data. More than a 40% cost reduction was simulated by using the TDS-Cooling-Method when drilling the bottom 1, 000m section of a 3, 500m well.<br>Several deep, high-temperature oil wells, with bottom hole static temperatures ranging from 180 to 230°C, have been drilled since 1990 in Japan by MITI. Reports are that bit life decreased to 15 to 30 hours, when the deeper sections of these wells were drilled. Bit performance of the MITI-Nishikubiki well was surveyed and judged that o-rings were damaged while RIH due to high temperatures. Judging from the WD-1A case, the TDS-Cooling-Method was considered to be a possible solution method to prolong the bit life. Economic evaluation of the use of TDS-Cooling-Method was made for the MITI-Nishikubiki well and determined that a 56 million yen cost reduction could be achieved by using the TDS-Cooling-Method if applied for the last 600m section.<br>TDS-Cooling-Method can be expected to extend the use of temperature sensitive tools and prolong their life for both geothermal and oil wells. Therefore, even greater cost savings can be expected in addition to those simulated.

収録刊行物

• 石油技術協会誌

  石油技術協会誌 65 (5), 403-416, 2000

  石油技術協会

キーワード

• drilling
• high temperature geothermal well
• high temperature oil well
• bit performance
• top drive drilling system
• borehole temperature
• economic evaluation
• Kakkonda
• Nishikubiki

詳細情報

• CRID: 1390282679038086272
• NII論文ID: 10009897100
• NII論文ID: 10008012804
• NII書誌ID: AN00130976
• DOI: 10.3720/japt.65.403
• ISSN: 18814131
• ISSN: 03709868
• NDL書誌ID: 5600563
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5600563
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可