CA1177057A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Fixed-contact stabilizer
Assignee: Individual
•
Filing: 1981-06-08
•
Granted: 1984-10-30
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Expires: 2001-06-08
Abstract
Abstract FIXED-CONTACT STABILIZER ABSTRACT OF THE INVENTION A drill string stabilizer in which the wall-contacting wear elements or blades are secured in their accommodating pockets by a lateral interference fit. One embodiment includes recess-and-projection connections between end-to-end aligned, individual wear elements, the surfaces of mating parts permitting rotation. Cap screws and locking blocks are also employed in some embodiments. Surfaces of the locking block and the pocket permit its insertion without longitudinal movement. An alternate embodiment not using a plurality of elements or a locking block employs a transverse thrust surface which is slightly angled to permit rotation fitting into the accommodating pocket. The blades are made to assure uniform side pressure within their respective accommo-dating pockets by slight inward dimension tapering or by longitudinal underneath blade slotting to provide a leg structure that flexes, the tapering or slotting acting in opposition to natural loosening that would occur if a uniformly dimensioned and non-flexible blade were pressed into a uniformly dimensioned pocket.
Inventors
- 👤 William R. Garrett
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-09 03:25
CPC Classifications
—
Claims Analysis
Total Claims: 55
Claim 1
Independent Claim
136 words
Borehole contacting apparatus adaptable for use as an element in a drill string, comprising an annular elongated body having a fluid circulation hole therethrough and threaded at each end for connection within a drill string to adjoining members cooperatively threaded therewith, a plurality of outwardly opening elongated slotted pockets about said body having substantially parallel elongated body sides, and a plurality of releasably securable wear blades, at least one of said blades being accommodated in each of said pockets, each of said blades extending radially beyond the surface of said body, each of said blades having substantially parallel sides for respective interference mating engagement with said parallel elongated body sides of said pockets, each of said blades being held tightly within its accommodating pocket by elastic deformation of at least one of said blade and body.
Claim 2
Dependent Claim
136 words
Borehole contacting apparatus adaptable for use as an element in a drill string, comprising an annular elongated body having a fluid circulation hole therethrough and threaded at each end for connection within a drill string to adjoining members cooperatively threaded therewith, a plurality of outwardly opening elongated slotted pockets about said body having substantially parallel elongated body sides, and a plurality of releasably securable wear blades, at least one of said blades being accommodated in each of said pockets, each of said blades extending radially beyond the surface of said body, each of said blades having substantially parallel sides for respective interference mating engagement with said parallel elongated body sides of said pockets, each of said blades being held tightly within its accommodating pocket by elastic deformation of at least one of said blade and body.
Claim 3
Dependent Claim
26 words
Borehole apparatus in accordance with claim 1, wherein said uppermost blade accommodated in each of said pockets includes an engagement surface actionable by a removal tool.
Claim 4
Dependent Claim
15 words
Borehole apparatus in accordance with claim 2, wherein said engagement surface is an undercut recess.
Claim 5
Dependent Claim
41 words
Borehole apparatus in accordance with claim 1, wherein each of said pockets includes a transverse limit surface and including end abutment thrust means between the end of at least one blade in each of said pockets and said pocket limit surface.
Claim 6
Dependent Claim
42 words
Borehole apparatus in accordance with claim 4, wherein said pocket limit surface is at an outwardly slanting obtuse angle with respect to said at least one accommodated blade, said pocket including a notch for accommodating a removal tool for dislodging said blade.
Claim 7
Dependent Claim
19 words
Borehole apparatus in accordance with claim 1, and including thrust means intermediate the ends of each of said blades.
Claim 8
Dependent Claim
50 words
Borehole apparatus in accordance with claim 1, wherein respectively each of said blades is bored for the receipt of at least one cap screw, said body being bored and tapped in alignment therewith, and including a cap screw for additional releasably securing said respective blades at each cap screw bore.
Claim 9
Dependent Claim
51 words
Borehole apparatus in accordance with claim 7, wherein each of said pockets includes a limit surface at a large angle with respect to said parallel body sides, and including end abutment thrust means between the end of at least one blade in each of said pockets and said pocket limit surface.
Claim 10
Dependent Claim
26 words
Borehole apparatus in accordance with claim 8, wherein said uppermost blade accommodated in each of said pockets includes an engagement surface actionable by a removal tool.
Claim 11
Dependent Claim
18 words
Borehole apparatus in accordance with claim 9, wherein said removal tool includes wedging surfaces for providing blade dislodging.
Claim 12
Dependent Claim
54 words
Borehole apparatus in accordance with claim 1, wherein each of said pockets includes first interlock means in the end of said pocket nearest the lower end of the apparatus as it is located within the drill string, and where the adjacent accommodated blade includes a second interlock means connectable with said first interlock means.
Claim 13
Dependent Claim
57 words
Borehole apparatus in accordance with claim 1, wherein each of said pockets includes an undercut recess in the end of said pocket nearest the lower end of the apparatus as it is located within the drill string, and wherein the adjacent accommodated blade includes a projection for mating with said undercut recess in the respective accommodating pocket.
Claim 14
Dependent Claim
34 words
Borehole apparatus in accordance with claim 12, wherein the lower extended surface of said lowermost accommodated blade in each of said pockets is tapered, and including a wear resistant surface on said tapered surface.
Claim 15
Dependent Claim
49 words
Borehole apparatus in accordance with claim 12, wherein the inside portion of said undercut recess includes a curvilinear surface with a small radius, and wherein said mating projection includes a contiguous curvilinear surface with a radius larger than said small radius of the curvilinear surface of said undercut recess.
Claim 16
Dependent Claim
44 words
Borehole apparatus in accordance with claim 12, and including a second respectively accommodated blade in each of said accommodating pockets, the upper end of said firstnamed blade including a second recess, said second blade including a second projection for mating with said second recess.
Claim 17
Dependent Claim
101 words
Borehole apparatus in accordance with claim 12, and including a second respectively accommodated blade in each of said accommodating pockets, the upper end of said first named blade including a first shoulder at a recess for its extended surface, said body having a hole bored and tapped in alignment with said upper end, the lower end of said second blade including a second shoulder at a recess from its extended surface, and including a cap screw accommodated in said hole for securing within the accommodated pocket the upper end of said firstnamed blade and the lower end of said second blade.
Claim 18
Dependent Claim
53 words
Borehole apparatus in acordance with claim 12, and including a block respectively accommodated in each of said accommodating pockets between the uppermost blade and the upper end of the pocket, the upper end of said uppermost blade including a second recess, said block including a second projection for mating with said second recess.
Claim 19
Dependent Claim
74 words
Borehole apparatus in accordance with claim 17, wherein the inside portion of said second recess includes a curvilinear surface with a small radius, and wherein said mating projection from said block includes a contiguous surface with a radius larger than said small radius of the curvilinear surface of said second recess, said block being cut away outwardly of said mating projection to permit rotational insertion of said block with no substantial longitudinal movement -thereof.
Claim 20
Dependent Claim
69 words
Borehole apparatus in accordance with claim 17, wherein the upper end of each of said pockets includes a limit surface at a large angle with respect to said parallel body sides deep within said pocket, said pocket being cut away outwardly thereof to permit rotational insertion of said block with no substantial longitudinal movement thereof, so that the blades within said pockets are restricted from substantial longitudinal thrust movement.
Claim 21
Dependent Claim
45 words
Borehole apparatus in accordance with claim 17, wherein said block extends less than radially beyond the surface of said body, the sides of said block being spaced apart less than said parallel elongated body sides so as not to form an interference mating engagement therewith.
Claim 22
Dependent Claim
114 words
Borehole contacting apparatus adaptable for use as an element in a drill string, comprising an annular elongated body having a fluid circulation hole therethrough and threaded at each end for connection within a drill string to adjoining members cooperatively threaded therewith, a plurality of outwardly opening elongated slotted pockets about said body having substantially parallel elongated body sides, and a plurality of releasably securable wear blades, at least one of said blades being accommodated in each of said pockets, each of said blades extending radially beyond the surface of said body, and means for assuring a tighter gripping of each of said wear blades nearer its outer periphery than deeper within its accommodating pocket.
Claim 23
Dependent Claim
114 words
Borehole contacting apparatus adaptable for use as an element in a drill string, comprising an annular elongated body having a fluid circulation hole therethrough and threaded at each end for connection within a drill string to adjoining members cooperatively threaded therewith, a plurality of outwardly opening elongated slotted pockets about said body having substantially parallel elongated body sides, and a plurality of releasably securable wear blades, at least one of said blades being accommodated in each of said pockets, each of said blades extending radially beyond the surface of said body, and means for assuring a tighter gripping of each of said wear blades nearer its outer periphery than deeper within its accommodating pocket.
Claim 24
Dependent Claim
26 words
Borehole apparatus in accordance with claim 21, wherein said uppermost blade accommodated in each of said pockets includes an engagement surface actionable by a removal tool.
Claim 25
Dependent Claim
18 words
Borehole apparatus in accordance with claim 22, wherein said removal tool includes wedging surfaces for providing blade dislodging.
Claim 26
Dependent Claim
15 words
Borehole apparatus in accordance with claim 22, wherein said engagement surface is an undercut recess.
Claim 27
Dependent Claim
51 words
Borehole apparatus in accordance with claim 21, wherein the sides of said blades and the corresponding sides of said accommodating pockets are dimensioned to form an interference fit therebetween, the dimensions at the outer periphery of said blades and said pockets interfering more than the dimensions thereof deep within said pockets.
Claim 28
Dependent Claim
62 words
Borehole apparatus in accordance with claim 21, wherein the sides of said blades and the corresponding sides of said accommodating pockets are dimensioned to form an interference fit therebetween, the inner portion of each of said blades including an elongated slot so that the outer periphery of each of said blades is less resilient than it is deep within its accommodating pocket.
Claim 29
Dependent Claim
55 words
Borehole apparatus in accordance with claim 21, wherein each of said pockets includes a limit surface at a large angle with respect to the thrust loading direction on said accommodated blades, and including end abutment thrust means between the end of at least one blade in each of said pockets and said pocket limit surface.
Claim 30
Dependent Claim
42 words
Borehole apparatus in accordance with claim 27, wherein said pocket limit surface is at an outwardly slanting obtuse angle with respect to said at least one accommodated blade, said pocket including a notch for accommodating a removal tool for dislodging said blade.
Claim 31
Dependent Claim
18 words
Borehole apparatus in accordance with claim 28, wherein said removal tool includes wedging surfaces for providing blade dislodging.
Claim 32
Dependent Claim
19 words
Borehole apparatus in accordance with claim 21, and including thrust means intermediate the ends of each of said blades.
Claim 33
Dependent Claim
50 words
Borehole apparatus in accordance with claim 21, wherein respectively each of said blades is bored for the receipt of at least one cap screw, said body being bored and tapped in alignment therewith and including a cap screw for additional releasably securing at each cap screw bore said respective blades.
Claim 34
Dependent Claim
55 words
Borehole apparatus in accordance with claim 31, wherein each of said pockets includes a limit surface at a large angle with respect to the thrust loading direction on said accommodated blades, and including end abutment thrust means between the end of at least one blade in each of said pockets and said pocket limit surface.
Claim 35
Dependent Claim
26 words
Borehole apparatus in accordance with claim 32, wherein said uppermost blade accommodated in each of said pockets includes an engagement surface actionable by a removal tool.
Claim 36
Dependent Claim
54 words
Borehole apparatus in accordance with claim 21, wherein each of said pockets includes first interlock means in the end of said pocket nearest the lower end of the apparatus as it is located within the drill string, and wherein the adjacent accommodated blade includes a second interlock means connectable with said first interlock means.
Claim 37
Dependent Claim
57 words
Borehole apparatus in accordance with claim 21, wherein each of said pockets includes an undercut recess in the end of said pocket nearest the lower end of the apparatus as it is located within the drill string, and wherein the adjacent accommodated blade includes a projection for mating with said undercut recess in the respective accommodating pocket.
Claim 38
Dependent Claim
34 words
Borehole apparatus in accordance with claim 35, wherein the lower extended surface of said lowermost accommodated blade in each of said pockets is tapered, and including a wear resistant surface on said tapered surface.
Claim 39
Dependent Claim
49 words
Borehole apparatus in accordance with claim 35, wherein the inside portion of said undercut recess includes a curvilinear surface with a small radius, and wherein said mating projection includes a contiguous curvilinear surface with a radius larger than said small radius of the curvilinear surface of said undercut recess.
Claim 40
Dependent Claim
44 words
Borehole apparatus in accordance with claim 35, and including a second respectively accommodated blade in each of said accommodating pockets, the upper end of said firstnamed blade including a second recess, said second blade including a second projection for mating with said second recess.
Claim 41
Dependent Claim
100 words
Borehole apparatus in accordance with claim 35, and including a second respectively accommodated blade in each of said accommodating pockets, the upper end of said firstnamed blade including a first shoulder at a recess from its extended surface, said body having a hole bored and tapped in alignment with said upper end, the lower end of said second blade including a second shoulder at a recess from its extended surface, and including a cap screw accommodated in said hole for securing within the accommodated pocket the upper end of said firstnamed blade and the lower end of said second blade.
Claim 42
Dependent Claim
53 words
Borehole apparatus in accordance with claim 35, and including a block respectively accommodated in each of said accommodating pockets between the uppermost blade and the upper end of the pocket, the upper end of said uppermost blade including a second recess, said block including a second projection for mating with said second recess.
Claim 43
Dependent Claim
74 words
Borehole apparatus in accordance with claim 40, wherein the inside portion of said second recess includes a curvilinear surface with a small radius, and wherein said mating projection from said block includes a contiguous surface with a radius larger than said small radius of the curvilinear surface of said second recess, said block being cut away outwardly of said mating projection to permit rotational insertion of said block with no substantial longitudinal movement thereof.
Claim 44
Dependent Claim
69 words
Borehole apparatus in accordance with claim 41, wherein the upper end of each of said pockets includes a limit surface at a large angle with respect to said parallel body sides deep within said pocket, said pocket being cut away outwardly thereof to permit rotational insertion of said block with no substantial longitudinal movement thereof, so that the blades within said pockets are restricted from substantial longitudinal thrust movement.
Claim 45
Dependent Claim
45 words
Borehole apparatus in accordance with claim 40, wherein said block extends less than radially beyond the surface of said body, the sides of said block being spaced apart less than said parallel elongated body sides so as not to form an interference mating engagement therewith.
Claim 46
Dependent Claim
50 words
Borehole apparatus comprising a tubular body having a flow axis, said body having a plurality of equiazimuthally spaced substantially parallel sided slots each extending in a direction having at least a paraxial component, and blade means received in each slot making an interference fit with the sides of the slot.
Claim 47
Dependent Claim
50 words
Borehole apparatus comprising a tubular body having a flow axis, said body having a plurality of equiazimuthally spaced substantially parallel sided slots each extending in a direction having at least a paraxial component, and blade means received in each slot making an interference fit with the sides of the slot.
Claim 48
Dependent Claim
31 words
Apparatus according to claim 44, the lateral stress on the sides of the blade means being at least as great at the mouth of each slot as at the bottom thereof.
Claim 49
Dependent Claim
15 words
Apparatus according to claim 44, each slot having a length/width ratio of at least five-to-one.
Claim 50
Dependent Claim
13 words
Apparatus according to claim 44, each blade means having outwardly flaring side walls.
Claim 51
Dependent Claim
22 words
Apparatus according to claim 44, each slot having two sides and a bottom, the junctures of the sides and bottom being filleted.
Claim 52
Dependent Claim
43 words
Apparatus according to claim 44, including supplemental radial retention means for retaining each blade means in its slot against radial withdrawal therefrom, and paraxial retention means independent of said radial retention means for transferring paraxial loads on the blade means to the body.
Claim 53
Dependent Claim
31 words
Apparatus according to claim 49, wherein said paraxial retention means comprises dowel pin means in the bottom of each slot extending into sockets at the inner edge of each blade means.
Claim 54
Dependent Claim
38 words
Apparatus according to claim 44, wherein each slot has locking means at the ends thereof, and each blade means has locking means at the ends thereof for locking with the locking means at the ends of the slot.
Claim 55
Dependent Claim
42 words
Apparatus according to claim 51, wherein each blade means comprises a plurality of components each having locking means at its ends for locking with the adjacent ones of the locking means on the adjacent components and at the ends of the slot.
References Cited (Backward Citations)
No citation records indexed.
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