Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent
1986-10-22
1988-06-14
Leppink, James A.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Firing control mechanically actuated in bore
175 44, E21B 4904
Patent
active
047505702
ABSTRACT:
Sampling bullets of the type which are fired into rock formation surrounding a wellbore. The core sampling bullet includes an internal core barrel which is defined in part by a core receiving sleeve releasably secured within the bullet structure. Following bullet retrieval, the bullet is disassembled thereby permitting rearward removal of the core sleeve with core entrapped therein. Following extraction from the bullet, the core sleeve protects the core during handling and testing. The removed core sleeve is further closed by end cap members to further secure the core against contamination and against further loss of gas in core sample prior to testing. The bullet construction also provides for efficiency of hydraulic venting during firing and provides efficiently for bullet with core removal by means of one or more cables. Core orientation is also achieved.
REFERENCES:
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patent: 3477525 (1969-11-01), Farrell et al.
patent: 4156469 (1979-05-01), Laskey
patent: 4280568 (1981-07-01), McPhee et al.
patent: 4569403 (1986-02-01), Barrett
Barrett Machine Works
Dang Hoang C.
Leppink James A.
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