FIELD: oil-and-gas industry.
SUBSTANCE: set of invention relates to well drilling and is used for withdrawal of detachable core receiver. Device comprises first part with long case to be connected with lifting rope at one end and with tubular opening to receive the head arranged at opposite end. Its second part with shears-like mechanism comprises two grippers for core withdrawal to turn about common axle. Said grippers are connected by shifting device. First part comprises central axially extending groove. Said common axle slides in gap between first end position whereat shifting device covers aforesaid grippers so that the head located in tubular opening is squeezed and second position whereat opening means said pull apart said grippers for displacement of core receiver to open position with overcoming the shifting device resistance to release said head.
EFFECT: higher safety, better control.
11 cl, 16 dwg
| Title | Year | Author | Number |
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