US 4,067,596 AGranted

Dual flow passage drill stem

AssigneeSmith International, Inc.

InventorsJackson M. Kellner, Vincent Hugo Vetter

Life of this patent

Estimating the term…

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Abstract

Dual flow passage drill stem has a tube radially supported within a drill pipe by a plurality of metal ribs welded to the middle portion of the tube and by elastomer O-rings mounted in spiders disposed around the tube connectors and seated against outwardly facing shoulders in the pipe tool joints. Axial loads are taken by elastomer rings around the tube connectors clamped between outwardly facing annular rabbets at the inner periphery of each spider and an integral flange on the pin tube connector and a threaded flange screwed onto box tube connector. The tube is preloaded in tension and the pipe and elastomer rings are preloaded in compression. The axial support elastomer rings preferably have hour-glass cross sections to increase their damping effect; in addition, the axial support elastomer rings, as well as the radial support O-rings, are preferably made of neoprene, which has a relatively flat curve of force transmission versus frequency. Desirably the elastomer mounted tube has a resonant frequency different from that of the expected cyclic loading of the pipe, e.g., when employed with a vibratory or hammer drill motor.

Claims25

Dependent claims

Dual tube drill stem comprising pipe means including connection means at each end thereof for making connection with other drill string members,

tubular means having ends adapted for making connection with other drill string members, said tubular means being disposed within the pipe means and extending longitudinally through the inside of the pipe means from one end of the pipe means to the other providing an imperforate wall fluid passage inside the tubular means from adjacent one end of the pipe means to the other and
support means within the pipe means positioning the tube means within the pipe means and placing the entire length of the tubular means in radially spaced relationship with respect to said pipe means, providing an imperforate wall fluid passage therebetween extending past said support means from said one end of the pipe means to the other,
said support means including elastomer sandwich means comprising a first annular surface on the interior of the pipe means, a second annular surface on the exterior of the tube means, and annularly disposed elastomer means disposed between said surfaces,
each of said surfaces when resolved into any components facing axially and radially including at least some axially facing component, whereby said elastomer means provides axial support for the tube means within the pipe means and said elastomer means is compressed upon relative axial movement of said pipe means and tube means in the direction bringing said surfaces closer together,
said drill stem being free of stop surfaces which would prevent limited relative axial movement of said tube means and pipe means in one axial direction and also free of stop surfaces which would prevent limited relative axial movement of said tubular means and pipe means in the opposite axial direction.

2 more elements

Dual tube drill stem comprising pipe means including connection means at each end thereof for making connection with other drill string members,

tubular means having ends adapted for making connection with other drill string members, said tubular means being disposed within the pipe means and extending longitudinally through the inside of the pipe means from one end of the pipe means to the other providing an imperforate wall fluid passage inside the tubular means from adjacent one end of the pipe means to the other, and
support means within the pipe means positioning the tube means within the pipe means and placing the entire length of the tubular means in radially spaced relationship with respect to said pipe means providing an imperforate wall fluid passage therebetween extending past said support means from said one end of the pipe means to the other,
said support means including elastomer sandwich means comprising a first annular surface on the interior of the pipe means, a second annular surface on the exterior of the tube means, and annularly disposed elastomer means disposed between said surfaces,
each of said surfaces when resolved into any components facing axially and radially including at least some axially facing component, whereby said elastomer means provides axial support for the tube means within the pipe means and said elastomer means is compressed upon relative axial movement of said pipe means and tube means in the direction bringing said surfaces closer together,
said drill stem being free of stop surfaces which would prevent limited relative axial movement of said tube means and pipe means in one axial direction and also free of stop surfaces which would prevent limited relative axial movement of said tubular means and pipe means in the opposite axial direction,
said support means including a plurality of said elastomer sandwich means disposed one near each end of the drill stem, said axially facing components of said surfaces of one of said elastomer sandwich means being directed oppositely to said axially facing components of the corresponding ones of said surfaces of the other of said elastomer sandwich means.

3 more elements

Dual tube drill stem comprising pipe means,

tubular means within the pipe means extending longitudinally through the inside of the pipe means from one end of the pipe means to the other,
support means positioning the tube means within the pipe means,
said support means including elastomer sandwich means comprising a first annular surface on the interior of the pipe means, a second annular surface on the exterior of the tube means, and annularly disposed elastomer means disposed between said surfaces,
each of said surfaces when resolved into any components facing axially and radially including at least some axially facing component, whereby said elastomer means provides axial support for the tube means within the pipe means and said elastomer means is compressed upon relative axial movement of said pipe means and tube means in the direction bringing said surfaces closer together,
said drill stem being free of stop surfaces which would prevent limited relative axial movement of said tube means and pipe means,
said support means including a plurality of said elastomer sandwich means disposed one near each end of the drill stem,
said pipe means including a pipe with shouldered tool joints connected to the ends thereof,
said tube means including a tube with telescopic connectors connected to the ends thereof, the telescopic connections of the ends of the tube being free of axial stop surfaces which would prevent axial movement of the tube means when the drill stem is connected to a drill string member having correlative tool joints and connectors and the connected tool joints are made up into shoulder to shoulder engagement,
said pipe means further including an annular spider in each tool joint extending around the pipe means,
said tube means further including an annular flange around each connector alongside the spider at that end of the drill stem,
said annular surfaces of said elastomer sandwich means being provided on said spiders and flanges.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/717,628Filed 25 Aug 1976
Granted: 10 Jan 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16L 39/005
Joints or fittings for double-walled or multi-channel pipes or pipe assemblies: for concentric pipes
E21B 17/042
Between rod or the like and bit or between rod and rod or the like: threaded
E21B 17/18
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings: pipes provided with plural fluid…
F16L 9/18
Rigid pipes: double-walled pipes; Multi-channel pipes or pipe assemblies