US4077657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable bent sub
Assignee: Halliburton Co
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Filing: 1976-03-22
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Granted: 1978-03-07
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Expires: 1996-03-22
Abstract
Abstract This invention relates to a device for selectively setting the axial alignment of sections of pipe from axial coincidence to an obtuse angle between the pipe sections.
Inventors
- 👤 Kurt H. Trzeciak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:27
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/05; E21B7/00; E21B7/04; E21B7/06; E21B7/067; F; F16; F16L; F16L27/00; F16L27/08; F16L27/0849
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
170 words
An adjustable bent sub comprising a hollow tubular box section, a box at one end of said box section, and a hollow tubular pin section, a pin at one end of the pin section, an end of the box section mating with an end of the pin section, the plane of the said end of the box section is inclined at an angle to the axis of the box section and the plane of said end of the pin section is inclined at an angle to the axis of the pin section, means to position the said box section and pin section at various azimuthal angles of displacement of the box section with respect to the pin section, means to lock said box section to said pin section at said azimuthal angular positions against angular displacement of one section relative to the other section, whereby the box section is positioned and locked at various vertical angles of the box section with respect of the pin section for each azimuthal position.
Claim 2
Dependent Claim
170 words
An adjustable bent sub comprising a hollow tubular box section, a box at one end of said box section, and a hollow tubular pin section, a pin at one end of the pin section, an end of the box section mating with an end of the pin section, the plane of the said end of the box section is inclined at an angle to the axis of the box section and the plane of said end of the pin section is inclined at an angle to the axis of the pin section, means to position the said box section and pin section at various azimuthal angles of displacement of the box section with respect to the pin section, means to lock said box section to said pin section at said azimuthal angular positions against angular displacement of one section relative to the other section, whereby the box section is positioned and locked at various vertical angles of the box section with respect of the pin section for each azimuthal position.
Claim 3
Dependent Claim
51 words
The adjustable sub of claim 1, in which said means to lock said pin section to said box section includes a jaw clutch between said pin section and said box section and means positioned in the hollow tubular sections for releasably connecting said tubular pin section to said tubular pin section.
Claim 4
Dependent Claim
30 words
The adjustable bent sub of claim 2 in which said releasable locking means comprises a nut positioned with one of the tubular sections and threaded into the other tubular section.
Claim 5
Dependent Claim
56 words
The adjustable bent sub of claim 1 in which said clutch is a jaw clutch, teeth positioned about the inclined end of the box section and complementary teeth positioned about the inclined end of the pin section, said teeth mating with each other, the crowns and roots of said teeth being positioned on said inclined planes.
Claim 6
Dependent Claim
52 words
The adjustable bent sub of claim 4 in which said means to lock said pin section to said box section includes a jaw clutch between said pin section and said box section and means positioned in the hollow tubular sections for releasably connecting said tubular pin section to said tubular pin section.
Claim 7
Dependent Claim
56 words
The adjustable bent sub of claim 5 in which said clutch is a jaw clutch, teeth positioned about the inclined end of the box section and complementary teeth positioned about the inclined end of the pin section, said teeth mating with each other, the crowns and roots of said teeth being positioned on said inclined planes.
Claim 8
Dependent Claim
77 words
An adjustable bent sub of claim 1 in which the angle of the inclined plane "a", the azimuthal angle "d", and the vertical angle "b" of the axis of the box end section to the pin end section, is given by the following relation: sin b = (sin a sin d)/cos c where c = tan.sup.-1 [cos a (1 - cos d)/sin d ] and b = sin.sup.-1 [sin a cos a (1 - cos d)/sin c]
Claim 9
Dependent Claim
22 words
The adjustable bent sub of claim 5 in which "b" is less than about 4° and "a" is about 10° or less.
Claim 10
Dependent Claim
86 words
The adjustable bent sub of claim 5 in which said means to lock said pin section to said box section includes a jaw clutch between said pin section and said box section and means positioned in the hollow tubular sections for connecting said tubular pin section to said tubular box section, and locking said sections against angular displacement of one section relative to the other section, and to unlock the said sections to permit relative angular displacement of one section with respect of the other section.
Claim 11
Dependent Claim
30 words
The adjustable bent sub of claim 9 in which said releasable locking means comprises a nut positioned with one of the tubular sections and threaded into the other tubular section.
Claim 12
Dependent Claim
65 words
The adjustable bent sub of claim 6 in which said clutch is a jaw clutch, teeth positioned about the inclined end of the box section and complementary teeth positioned about the inclined end of the pin section, said teeth mating with each other, the crowns and roots of said teeth being positioned on said inclined planes and separated from each other at equal angular degrees.
Claim 13
Dependent Claim
52 words
The adjustable bent sub of claim 9 in which said means to lock said pin section to said box section includes a jaw clutch between said pin section and said box section and means positioned in the hollow tubular sections for releasably connecting said tubular pin section to said tubular pin section.
Claim 14
Dependent Claim
65 words
The adjustable bent sub of claim 12 in which said clutch is a jaw clutch, teeth positioned about the inclined end of the box section and complementary teeth positioned about the inclined end of the pin section, said teeth mating with each other, the crowns and roots of said teeth being positioned on said inclined planes and separated from each other at equal angular degrees.
Claim 15
Dependent Claim
19 words
The adjustable bent sub of claim 7, in which the parameter "d" may be varied by equal angular degrees.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |