Patents Assigned to H. Abe
  • Method of drilling a well by utilizing AE/MA measurement
    Patent number: 4924950
    Abstract: A method of drilling a well by utilizing AE/MA measurement which has the steps of monitoring an AE wave emitted at the periphery of the well, and drilling the well without lost circulation by providing lost circulation preventing means in the well if the energy of the AE wave emitted at the periphery of the well increases. Thus, the method can confirm a lost circulation layer, i.e., the size, the place and the direction of the underground crack to further determine whether further drilling is necessary or not.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: May 15, 1990
    Assignees: K. Nakatsuka, H. Abe, Japan Metals & Chemicals Co., Ltd., H. Niitsuma
    Inventors: Hiroaki Niitsuma, Katsuto Nakatsuka, Hiroyuki Abe, Morihiko Takanohashi, Ko Sato, Fumihiko Chiba