نمایش نتیجه 1 تا 3 از 3 نتیجه یافت شده برای FO cementer closing sleeve:
n: See FO cementer closing sleeve.
n: which is joined with the bottom of drill stem and lied under the cementer opening sleeve.The tool of FO cementer collar valve orifice is closed after cementing completed.
n: which is joined with the drill pipe or the bottom of flow string and lied under the FO cementer closing sleeve,used to the pressure of drill stems weight to open the FO cementer collar valve orifice .
© ۱۳۹۲-۱۳۹۷ این اثر شامل قانون حمایت از مولفین بوده و هرگونه کپی برداری از آن ممنوع است.
