Wells – Means for guiding insertable element laterally of well axis
Patent
1984-05-11
1986-08-05
Goldberg, Howard N.
Wells
Means for guiding insertable element laterally of well axis
29157R, 29558, 29DIG26, 72340, 138108, 138177, 138DIG11, E21B 700, B21D 5300
Patent
active
046037365
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of producing side-pocket mandrels free of welds.
Mandrels having offset side pockets with seatings for flow control valves to be placed in and removed from the side pockets, are interposed in a string of well tubing, the main bores of the mandrels being aligned with and generally of the same diameter as the bore of the well tubing. The valves are installed in or removed from the seatings therefor in the side pockets by a valve-handling apparatus or kickover tool, means being provided for moving the apparatus through the tubing and mandrels, the latter accommodating at an upper or lower level therein orienting sleeves adapted to guide the valve-handling apparatus into an attitude relative to the valve seating appropriate for installing a valve therein or removing a valve therefrom.
Hitherto, in the construction of side-pocket mandrels in the main, a window has been formed in the side of an elongate tubular body by cutting a segment out of the wall of said body and a fabricated insert has been substituted for the segment and has been welded in the window. In other constructions adjacent tubular members have been joined together using circumferential butt welds.
The majority of the failures that have occured in side-pocket mandrels over the years they have been in use have been directly attributable to weld seams giving way to stresses created in the mandrels as result of forces applied thereto during operational use.
The object of the present invention is to provide a method of producing side-pocket mandrels in which welding is entirely dispensed with and the resulting mandrels are free of welds and thus not subject to the failures hitherto directly attributable to welds.
In accordance with a first aspect of the present invention, a method of producing a side-pocket mandrel comprises diameter from each of the two ends thereof to predetermined depths to leave a land between the blind bores; smaller diameter than said blind bores and coaxial with or axially offset from but parallel to said blind bores; about a diametrical plane of said smaller bore is of semicircular arch periphery from one end of said land with the plane and parallel flanks thereof penetrating said smaller bore and effectively forming a window of actuate segmental shape in the periphery of the latter, and continues into a full bore of predetermined peripheral shape forming a valve pocket separated from and axially parallel to said smaller bore and emerging from the other end of said land; valve pocket; diameter and axially aligned with said smaller bore;
In accordance with a second aspect of the present invention, a method of producing a side-pocket mandrel comprises diameter from one end thereof to a predetermined depth to leave a land between the blind bore and the opposite end of the bar; smaller diameter than said blind bore and coaxial with or axially offset from but parallel to said blind bore; opposite end at least one bore which is symmetrical about a diametrical plane of said smaller bore, is of semicircular arch periphery from one end of said land with the plane and parallel flanks thereof penetrating said smaller bore and effectively forming a window of arcuate segmental shape in the periphery of the latter, and continues into a full bore of predetermined peripheral shape forming a valve pocket separated from and axially parallel to said smaller bore and emerging from the other end of said land into said larger bore; valve pocket; lesser external diameter and axially aligned with said smaller bore; opposite end to provide an end length of lesser external diameter;
In accordance with a third aspect of the present invention, a method of producing a side-pocket mandrel comprises cylindrical metal bar of predetermined length and diameter; opposite ends at least one bore which is symmetrical about a diametrical plane of said bore, is of semicircular arch periphery from one end of said land with the plane and parallel flanks thereof penetrating said bore and effectively forming a window of arcuate segme
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Goldberg Howard N.
Wallace R. S.
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