Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1983-12-27
1985-05-07
Leppink, James A.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 551, 166317, 166319, 166373, E21B 3408, E21B 43116
Patent
active
045152179
ABSTRACT:
A method and apparatus for effecting the perforation of a well casing and the adjoining production formation comprises a tubular housing connected between a perforating gun housing and the lower end of a tubular string. The perforating gun housing contains a firing mechanism, and the tubular housing contains a radial port normally closed by a sleeve. The sleeve is inserted at the surface in an open bottom, annular chamber, thus trapping surface ambient air between one end of the sleeve and the closed end of the fluid pressure chamber. The other end of the fluid pressure chamber is connected by fluid passage means to the interior of the perforating gun housing, hence gas pressure generated by the discharge of the perforating gun and formation fluid pressure produced by formation fluids flowing through the newly formed perforations are brought in contact with the other end of the sleeve. The sleeve is shear pinned in its port closing position, but is shiftable to a port opening position by the excess fluid pressure forces exerted by the firing of the perforating gun and the flow of formation fluids into the perforating gun housing. Normally, the fluid pressure in the tubular housing at the time of perforating is substantially less than the anticipated formation fluid pressure.
REFERENCES:
patent: 2251977 (1941-08-01), Burt
patent: 4151880 (1979-05-01), Vann
patent: 4299287 (1981-11-01), Vann et al.
patent: 4330039 (1982-05-01), Vann et al.
patent: 4436155 (1984-03-01), Brieger
Baker Oil Tools, Inc.
Dang Hoang C.
Leppink James A.
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