Takenaka Komuten Co., Ltd.

Takanaka Komuten Co., Ltd

Sekiso Co., Ltd.

Toshiyuki Ohshita

Mamoru Shinozaki

Masayasu Kitano

Katsutoshi Ohkochi

Seizo Kamata

A capsule for conveying chemicals through a borehole for stopping lost circulation is totally made from a thermoplastic or fragile material or has a bottom plate made from such a material. The capsule containing the chemicals is let down until it reaches the location of the lost circulation, where the capsule is either destroyed by a drilling rod or softened by the high temperature and high pressure at the location. Thus, the chemicals are diffused.

Method and device for conveying chemicals through borehole

A capsule for conveying chemicals through a borehole for stopping lost circulation has a fragile bottom plate. A weight for destroying the bottom plate is suspended above the capsule by a cord which extends over knife edges. A messenger for cutting the cord is mounted to a wire line. The weight is caused to collide with the messenger to cut the cord, for breaking the bottom plate. Thus, the chemicals are diffused.

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Hirakata, Japan

Toshiyuki Ohshita