US3834472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jarring accelerator
Assignee: Individual
•
Filing: 1973-03-16
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Granted: 1974-09-10
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Expires: 1993-03-16
Abstract
Abstract Accelerator apparatus for use with a jar in a drill string comprising: a cylindrical housing; a tubular mandrel disposed within the housing for axial movement between a fully retracted position and a fully extended position relative thereto; connection threads on the housing and mandrel for connecting the apparatus in a drill string above a jar; at least one annular chamber formed between the housing and mandrel; ports providing fluid communication between the chamber and a substantially constant pressure fluid source, and an annular surface carried on the mandrel within the annular chamber for transmitting forces from fluid within the chamber to the mandrel, tending to force the mandrel toward its retracted position. At least one other annular surface may be carried on a sleeve member mounted in the chamber independently of the mandrel but engagable by a portion of the mandrel on a predetermined amount of movement from its fully retracted position toward the fully extending position to cumulatively assist the first annular surface in transmitting forces from the fluid to the mandrel.
Inventors
- 👤 L Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:21
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B31/00; E21B31/107; E21B31/113
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
138 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed within said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in said drill string above said jar; d. annular chamber means formed between said housing and said mandrel; e. port means providing fluid communication between said chamber means and a substantially constant pressure fluid source; and f. annular surface means within said chamber means for transmitting forces from fluid within said chamber means to said mandrel tending to force said mandrel toward said retracted position, the effective area of said annular surface means being variable depending on the axial position of said mandrel relative to said housing.
Claim 2
Dependent Claim
138 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed within said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in said drill string above said jar; d. annular chamber means formed between said housing and said mandrel; e. port means providing fluid communication between said chamber means and a substantially constant pressure fluid source; and f. annular surface means within said chamber means for transmitting forces from fluid within said chamber means to said mandrel tending to force said mandrel toward said retracted position, the effective area of said annular surface means being variable depending on the axial position of said mandrel relative to said housing.
Claim 3
Dependent Claim
51 words
Accelerator apparatus as set forth in claim 1 in which said annular surface means comprises a plurality of annular surfaces cumulatively assisting each other in transmitting forces from said fluid to said mandrel upon predetermined axial movement of said tubular mandrel from said fully retracted position toward said fully extended position.
Claim 4
Dependent Claim
25 words
Accelerator apparatus as set forth in claim 2 in which each of said predetermined axial movements is greater than the free travel of said jar.
Claim 5
Dependent Claim
86 words
Accelerator apparatus as set forth in claim 2 in which said annular surface means comprises a first annular surface affixed to said mandrel and a second annular surface carried on sleeve means, said sleeve means being mounted in said chamber means independently of said mandrel and engagable by a portion of said mandrel on a predetermined amount of movement from said fully retracted position toward said fully extended position to increase the effective area of said annular surface means for transmitting said forces to said mandrel.
Claim 6
Dependent Claim
45 words
Accelerator apparatus as set forth in claim 4 comprising first seal means between said sleeve means and said housing and second seal means between said sleeve means and said mandrel, providing sliding sealing engagement between said sleeve means and said housing and said mandrel, respectively.
Claim 7
Dependent Claim
45 words
Accelerator apparatus as set forth in claim 5 in which said sleeve means comprises a tubular skirt portion connected to an enlarged head portion by an annular shoulder, said annular shoulder being engagable by said portion of said mandrel on said predetermined amount of movement.
Claim 8
Dependent Claim
38 words
Accelerator apparatus as set forth in claim 6 in which said head portion comprises said second annular surface, the end of said skirt portion being isolated from the pressure communicated to said chamber means through said port means.
Claim 9
Dependent Claim
76 words
Accelerator apparatus as set forth in claim 4 in which said annular surface means comprises a third annular surface carried on second sleeve means, said second sleeve means being mounted in said chamber means independently of said mandrel and engagable by another portion of said mandrel on a further predetermined amount of movement toward said fully extended position to further increase the effective area of said annular surface means for tRansmitting said forces to said mandrel.
Claim 10
Dependent Claim
44 words
Accelerator apparatus as set forth in claim 8 comprising seal means between said second sleeve means and said housing and between said second sleeve means and said mandrel, providing sliding sealing engagement between said second sleeve means and said housing and said mandrel, respectively.
Claim 11
Dependent Claim
91 words
Accelerator apparatus as set forth in claim 8 in which said second sleeve means comprises first and second sleeve members having mutually engagable tubular skirt portions connected to enlarged head portions, said third annular surface being carried on said first sleeve member head portion, the head portion of said second sleeve member comprising a forth annular surface in fluid communication with the interior of said mandrel and transmitting forces from fluid within said mandrel tending to cancel a portion of the force transmitted to said mandrel by said third annular surface.
Claim 12
Dependent Claim
63 words
Accelerator apparatus as set forth in claim 10 in which said second sleeve member is provided with shoulder means engagable with said housing on still a further predetermined amount of movement toward said fully extended position to separate said first and second sleeve members to still further increase the effective area of said annular surface means for transmitting said forces to said mandrel.
Claim 13
Dependent Claim
186 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed with said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in a drill string above said jar; d. an annular chamber formed between said housing and said mandrel; e. port means in said housing providing fluid communication between said chamber and a substantially constant pressure fluid source; f. a first annular surface carried by said mandrel within said chamber for transmitting forces from fluid within said chamber to said mandrel in a direction tending to move said mandrel toward said retracted position; and g. a sleeve member mounted in said chamber for sliding sealing engagement therewith and having a second annular surface thereon, said sleeve member being adapted for engagement with a portion of said mandrel, upon predetermined axial movement toward said fully extended position, to cumulatively assist said first mentioned annular surface in transmitting forces from said fluid within said chamber to said mandrel.
Claim 14
Dependent Claim
186 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed with said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in a drill string above said jar; d. an annular chamber formed between said housing and said mandrel; e. port means in said housing providing fluid communication between said chamber and a substantially constant pressure fluid source; f. a first annular surface carried by said mandrel within said chamber for transmitting forces from fluid within said chamber to said mandrel in a direction tending to move said mandrel toward said retracted position; and g. a sleeve member mounted in said chamber for sliding sealing engagement therewith and having a second annular surface thereon, said sleeve member being adapted for engagement with a portion of said mandrel, upon predetermined axial movement toward said fully extended position, to cumulatively assist said first mentioned annular surface in transmitting forces from said fluid within said chamber to said mandrel.
Claim 15
Dependent Claim
23 words
Accelerator apparatus as set forth in claim 12 in which said predetermined axial movement is greater than the free travel of said jar.
Claim 16
Dependent Claim
29 words
Accelerator apparatus as set forth in claim 12 comprising male and female spline members carried by said housing and mandrel, permitting relative axial movement but preventing relative rotation therebetween.
Claim 17
Dependent Claim
192 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed within said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in a drill string above said jar; d. a first chamber formed between said housing and said mandrel; e. first port means in said housing providing fluid communication between said chamber and a substantially constant pressure fluid source; f. an annular surface carried by said mandrel within said first chamber for transmitting forces from fluid within said first chamber to said mandrel in a direction tending to move said mandrel toward said retracted position; g. a second annular chamber formed between said housing and said mandrel and axially spaced from said first chamber; h. second port means providing fluid communication between said second chamber and said substantially constant pressure fluid source; and i. surface Means within said second chamber for transmitting forces from fluid within said second chamber to said mandrel cumulatively assisting the forces transmitted through said mandrel annular surface.
Claim 18
Dependent Claim
192 words
Accelerator apparatus for use with a jar in a drill string comprising: a. a cylindrical housing; b. a tubular mandrel disposed within said housing for axial movement between a fully retracted position and a fully extended position relative thereto; c. connection means on said housing and mandrel for connecting said apparatus in a drill string above said jar; d. a first chamber formed between said housing and said mandrel; e. first port means in said housing providing fluid communication between said chamber and a substantially constant pressure fluid source; f. an annular surface carried by said mandrel within said first chamber for transmitting forces from fluid within said first chamber to said mandrel in a direction tending to move said mandrel toward said retracted position; g. a second annular chamber formed between said housing and said mandrel and axially spaced from said first chamber; h. second port means providing fluid communication between said second chamber and said substantially constant pressure fluid source; and i. surface Means within said second chamber for transmitting forces from fluid within said second chamber to said mandrel cumulatively assisting the forces transmitted through said mandrel annular surface.
Claim 19
Dependent Claim
77 words
Accelerator apparatus as set forth in claim 15 in which said surface means comprises a sleeve member in sliding and sealing engagement with said second chamber and having an annular surface thereon exposed to the pressure within said second chamber, said sleeve member being engagable by a portion of said mandrel on a predetermined amount of movement toward said fully extended position to effect said transmission of forces to said mandrel through said sleeve member annular surface.
Claim 20
Dependent Claim
77 words
Accelerator apparatus as set forth in claim 16 comprising another sleeve member in sliding and sealing engagement with the exterior of said mandrel and the interior of said housing and having an annular surface thereon exposed to the pressure within the interior of said mandrel, said another sleeve member being engageable with said first mentioned sleeve member to cancel at least part of the forces transmitted through said first mentioned sleeve member annular surface to said mandrel.
Claim 21
Dependent Claim
57 words
Accelerator apparatus as set forth in claim 17 in which said another sleeve member is engageable with a portion of said housing on predetermined axial movement of said mandrel toward said fully extended position separating said another sleeve member from said first mentioned sleeve member and rendering said another sleeve member ineffective for said cancellation of forces.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |