<b>新規地熱掘削用リグ（ZJ50DBST）の紹介 </b>

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  • <b>Introduction of the (ZJ50DBST) Geothermal Drilling Rig </b>
  • 新規地熱掘削用リグ(ZJ50DBST)の紹介
  • シンキ チネツ クッサクヨウ リグ(ZJ50DBST)ノ ショウカイ

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<p>Nittetsu Mining Consultants Co., Ltd. (hereinafter referred to as NMCC) purchased an AC electric-drive rig “ZJ50DBST” for geothermal drilling manufactured by HONGHUA, China in 2013. This rig includes 1,600HP drawworks, top drive system and two mud pumps which develop 1,300HP and is capable of drilling a largediameter hole at shallow depths using a mud motor and running 9-5/8”CSG string to 2,500m. Furthermore, most of the components can be transported by 15-ton trucks and the mast doesn’t need to be raised because it can be assembled stacking up each section of it with a crane. It allows the rig to be rigged up even at a narrow site. On the other hand, some of the components such as small motors and a centrifuge are of poor quality. Therefore it is necessary to replace whole of those components or some parts of the components with products made in Japan or the USA.</p><p>There are some concerns about sustaining the performance of the rig such as parts procurement, how to do periodic maintenance, theft and trouble in transit. NMCC has considered solutions regarding these concerns.</p><p>This rig has a good reputation for usability from the drilling crews. NMCC plans to modify it to be easier to use. It cost approximately 1 billion yen to purchase the rig, excluding the expenses for meetings and inspection.</p>

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