Core sample taking bullet construction
In a formation sampling bullet adapted to be fired at high speed by an explosive charge from a support apparatus into an earth formation adjacent to a well borehole to penetrate the formation with nose portion to obtain and hold a formation sample core in longitudinal bore extending rearwardly from the nose member portion of the bullet, the bullet is described comprising: (a) an initial contact nose portion of a bullet forward of a longitudinal bore terminating at a circular opening of specified diameter at the nose portion; (b) an encircling wall surrounding the longitudinal bore to define the bore which bore extends to the rear of the cutting means; (c) an internal cylindrical surface defining the longitudinal bore; (d) an outer face behind the cutting means for contacting the formation on entry of the nose portion into the formation and the outer face defining an enlarged taper portion behind the nose portion; (e) the nose portion in longitudinal sectional view, being a rounded surface intersecting the outer face and the internal cylindrical surface; (f) release ring means surrounding the outer face; and (g) retainer means for holding the release ring means initially on the outer face during entry of the bullet into the formation.
- Assignee:
- Barrett Machine Works, Houston, TX
- Patent Number(s):
- US 4702327
- OSTI ID:
- 5907727
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CHEMICAL EXPLOSIVES
COMMINUTION
CORING EQUIPMENT
DESIGN
DRILLING EQUIPMENT
EQUIPMENT
EXPLORATION
EXPLOSIVE FRACTURING
EXPLOSIVES
FRACTURING
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
OPERATION
PETROLEUM DEPOSITS
RESOURCES
SAMPLING