成果報告書詳細
管理番号20160000000339
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム CO2レーザ照射による超臨界水雰囲気高温岩体の掘削システム開発
公開日2016/6/22
報告書年度2015 - 2015
委託先名日本海洋掘削株式会社 株式会社超臨界技術研究所 株式会社テルナイト 国立大学法人東北大学 国立大学法人大阪大学
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Development of a laser drilling system employing CO2 laser for deep hot dry rock in supercritical water (FY2015-FY2016) FY2015 Annual Report

1. Abstract
The project is the development of new drilling technology employing CO2 laser in deep hot dry rock.
CO2 laser has a wavelength with a high liquid absorption rate. Irradiating CO2 laser induces a cone-shaped bubble in opaque water. The collapse pressure of the induced bubbles causes to eject molten materials from a cavity generated in the rock underwater. However, for supercritical environment, we cannot expect bubbles induced by irradiation of CO2 laser for ejecting molten materials. Additionally, the drilling fluid system will be affected by thermal degradation in extremely HTHP (High Temperature High Pressure) condition.
For verification of CO2 laser processing and drilling fluid behavior in supercritical environment, the research in annual 2015 consists of items listed and below:
A. Verification of CO2 laser processing: How irradiating CO2 laser can drill hot rock in supercritical environment.
a.1) Thermodynamic analysis of a high temperature/high pressure vessel containing a supercritical water.
a.2) Planned experiments for processing a material in supercritical water by laser irradiation of two selected laser wavelengths.
B. Verification of drilling fluid behavior: How drilling fluid system will work in supercritical environment.
b.1) Planned experiment design.
b.2) Investigation and rearranging for the prior risk in supercritical experiment.
b.3) Review of HTHP mud system and encountering lost circulation.
2. Results
The results are listed below:
The characters from a.1) to b.1) denote those described in abstract.
a.1) Thermodynamic analysis of a high temperature-high pressure vessel containing supercritical water.
*Tabularization properties of elements of the designed vessel
a.2) Planned experiments for verification of processing a material in supercritical water by laser irradiation of two selected laser wavelengths.
*Determination of specification of a high temperature-high pressure vessel
*Design of high temperature-high pressure vessels
*Design of laser beam focusing device
*Selection of high speed camera for capturing phenomenon in supercritical water
*Selection of test specimen
*Determination of methods of analysis of test specimen
*Estimation of thermal diffusivity of supercritical water
*Estimation of absorption rate in supercritical water of laser beam
b.1) Planned experiment design.
*Determined mud formulation for supercritical testing
*Considered overview of supercritical testing
*Determined the items of mud test
b.2) Investigation and rearranging for the prior risk in supercritical experiment.
*Alkaline corrosion.
*Testing times
b.3) Review of HTHP mud system and encountering lost circulation.
*Research of using HPHT mud system in domestic geothermal drilling location
*Review of technical survey for HTHP mud systems of worldwide mud competitors
*Review of encountering lost circulation has yet been scarcely
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