Boring or penetrating the earth – Boring with explosion in inaccessible hole – With position orienting or indicating
Patent
1990-04-12
1991-08-20
Dang, Hoang C.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
With position orienting or indicating
166 50, 166 551, 166241, E21B 43116, E21B 2300
Patent
active
050406191
ABSTRACT:
A perforating gun assembly is set forth. It incorporates a swivel connected with a cable head assembly and a navigation system for determining the instantaneous angle of the tool with respect to a vertical reference. There are first and second spaced cages formed of sleeves supported on bearing assemblies. The sleeves support free wheeling rollers which engage the casing when the tool is in the slant hole region of the well. There is an eccentric which falls downwardly, i.e., pointing toward gravity, and thereby defines a vertical reference and hence a horizontal reference. This eccentric mounts an elongate tubular housing for the shaped charges. Initially, the angle of firing of the shaped charges is adjusted at the time of installation with respect to the horizon and that in turn is correlated to the formation of interest in the well borehole which is then perforated with perforations which are parallel to the formation bedding plane.
REFERENCES:
patent: 3209828 (1965-10-01), Lebourg
patent: 4194577 (1980-03-01), Vann
patent: 4410051 (1983-10-01), Daniel et al.
patent: 4438810 (1984-03-01), Wilkinson
patent: 4637478 (1987-01-01), George
Gilbert Gregory N.
Grigar Larry L.
Jordan John W.
Slagle Terry L.
Tomek Martin L.
Beard William J.
Dang Hoang C.
Halliburton Logging Services Inc.
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