本文へジャンプ

成果報告書詳細
管理番号20190000000188
タイトル*平成30年度中間年報 超臨界地熱発電技術研究開発 調査井の資材(ケーシング材及びセメント材)等の開発 超臨界地熱発電に必要な坑井及び地上設備仕様の調査・検討
公開日2019/5/16
報告書年度2018 - 2018
委託先名国立大学法人秋田大学 エヌケーケーシームレス鋼管株式会社 地熱エンジニアリング株式会社 富士電機株式会社
プロジェクト番号P18008
部署名新エネルギー部
和文要約
英文要約Title: Research and Development on Supercritical Geothermal Power Generation Technology / Development of Casing, Cement and Other Materials and Equipment for Supercritical Geothermal Exploration Well / Study on Well Design and Surface Facilities Specification Required for Supercritical Geothermal Power Generation (FY2018-FY2019) FY2018 Annual Report

Casing and cement materials, downhole equipment, and surface power generation system suitable for exploration and production of supercritical geothermal resources were studied.
(1) Based on the casing program proposed in the FY 2017 study, casing materials for supercritical geothermal wells, in which the supposed subsurface temperature and pH were approximately 500 degrees Celsius and 3.0 respectively, were concluded to have mechanical properties equivalent to the API casing grade T95. According to the test results in FY 2017 study, the SiC/SiC composite material has insufficient mechanical properties for casing strings on which various stresses will act under supercritical geothermal conditions at the moment. Estimation of corrosion rates for metal materials under supercritical subsurface conditions and ceramic coating technologies to metal tubulars were also studied.
(2) Prototypes of high-Alumina cement systems suitable for drilling and completing supercritical geothermal wells were experimentally made. The rheological properties of the cement slurries and mechanical properties of the solidified cements were tested at elevated temperatures. A high-pressure and high-temperature test equipment for cement materials was delivered to the Akita University. Modification of the "GEOTEMP2" wellbore temperature simulator code to design optimum cementing procedures is ongoing.
(3) Well design and drilling plan for supercritical geothermal wells proposed in FY 2017 study were modified according to the formation pressure and temperature conditions recorded in the "Kakkonda WD-1a" superhot geothermal exploration well. Casing running and cementing procedures were reviewed based on the downhole pressure, temperature, and corrosive environment estimated by use of a commercial flow simulator "OLGA," and the stresses acted on and deformations generated in the casing strings caused by the repeated changes of thermal stresses simulated by use of a commercial casing design software "WELLCAT." Chemical and thermodynamic properties of supercritical geothermal fluids were also evaluated.
(4) Three types of steam cleaning methods to remove silica precipitation from supercritical geothermal fluids were proposed and examined in consideration of required thermal energy to generate sufficient electrical power according to the amount and properties of silica precipitation estimated to be produced from supercritical geothermal wells.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る