Takenaka Komuten Co., Ltd.

Kabushiki Kaisha Takenaka Komuten

Takanaka Komuten Co., Ltd

Sekiso Co., Ltd.

Masayasu Kitano

Mamoru Shinozaki

Katsutoshi Ohkochi

Toshiyuki Ohshita

Seizo Kamata

Hirosuke Kubota

Motoki Kondo

Toshiyuki Oshita

Katsumi Shirai

Tomohiro Teramura

This invention provides a method of preventing loss of muddy water used in boring a hole in the ground by a drill bit or the like with the muddy water introduced into the hole to stabilize hole walls and to remove slime resulting from the boring. When the muddy water is getting lost to the soil, a chemical liquid comprising an isocyanate compound or including an isocyanate compound as a main component is introduced along with a fibrous filler to a depth of the hole. The position from which the muddy water is leaking is filled with the fibrous filler and is sealed with a cured product of the chemical liquid.

Method of preventing loss of drilling mud during boring a hole in the

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.

Growing community of inventors

Kashihara, Japan

Masayasu Kitano