CA1127075A - Tubing drain - Google Patents
Tubing drainInfo
- Publication number
- CA1127075A CA1127075A CA339,843A CA339843A CA1127075A CA 1127075 A CA1127075 A CA 1127075A CA 339843 A CA339843 A CA 339843A CA 1127075 A CA1127075 A CA 1127075A
- Authority
- CA
- Canada
- Prior art keywords
- tubing
- closure
- retainer
- drain passage
- bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Pressure Vessels And Lids Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A well tubing drain assembly includes a tubing wall containing a bore intersecting the tubing interior and a counterbore intersecting the tubing exterior, an annular retainer in the counterbore having connection to the wall, the retainer forming a side drain passage, a retainer member carried by the retainer and projecting into the drain passage, a closure in alignment with the drain passage and retained by the member at the side thereof closest to the tubing bore interior, the closure closing off said tubing wall bore, the closure adapted to be blow out the drain passage when fluid pressure in the tubing bore transmits sufficient force via the closure to rupture said member, and a sealing washer located in the counterbore and extending about the closure to have sealing engagement therewith in response to pressure exerted on the washer by the fluid in the tubing.
A well tubing drain assembly includes a tubing wall containing a bore intersecting the tubing interior and a counterbore intersecting the tubing exterior, an annular retainer in the counterbore having connection to the wall, the retainer forming a side drain passage, a retainer member carried by the retainer and projecting into the drain passage, a closure in alignment with the drain passage and retained by the member at the side thereof closest to the tubing bore interior, the closure closing off said tubing wall bore, the closure adapted to be blow out the drain passage when fluid pressure in the tubing bore transmits sufficient force via the closure to rupture said member, and a sealing washer located in the counterbore and extending about the closure to have sealing engagement therewith in response to pressure exerted on the washer by the fluid in the tubing.
Description
BACKGROUND OF THE INVENTION
This inven-tion relates generally to tubing drains, and more particularly concerns a very simple drain assembly characterized by ease oE removal and replacement as well as by assured operation at predetermined pressure level~
Oil well tubing drains are employed to drain pressurized fluid from within the tuhiny when the fluid pressure in the tubing is.increased. Prior tubing ..
drainsare characterized as excessively complex in construction, which add to their original as well as maintenance cost or expense. One example of such a prior drain i5 that shown at page 4212 of the 1957 l 'IComposite Catalogue of Oil Field Equipment and Services", published by ~Jorld Oil.
SUM~L~RY OF THE INVE~TION
I~ is a major object o~ the invention to provide a signi~icantly improved tubing drain, as will be described.
Basically, the drain assembly is receivable in a tubing 29 wall containing a kore intersecting the tubing interior, and a counterbore intersecting the tubing exterlor, the assembly comprising a~ an annular retainer receivable in the counterbore for connection to said wall, the retainer forming a drain passage, b) a retaining member carried by the retainer and projecting into said drain passage, ?~. .
~;
'
This inven-tion relates generally to tubing drains, and more particularly concerns a very simple drain assembly characterized by ease oE removal and replacement as well as by assured operation at predetermined pressure level~
Oil well tubing drains are employed to drain pressurized fluid from within the tuhiny when the fluid pressure in the tubing is.increased. Prior tubing ..
drainsare characterized as excessively complex in construction, which add to their original as well as maintenance cost or expense. One example of such a prior drain i5 that shown at page 4212 of the 1957 l 'IComposite Catalogue of Oil Field Equipment and Services", published by ~Jorld Oil.
SUM~L~RY OF THE INVE~TION
I~ is a major object o~ the invention to provide a signi~icantly improved tubing drain, as will be described.
Basically, the drain assembly is receivable in a tubing 29 wall containing a kore intersecting the tubing interior, and a counterbore intersecting the tubing exterlor, the assembly comprising a~ an annular retainer receivable in the counterbore for connection to said wall, the retainer forming a drain passage, b) a retaining member carried by the retainer and projecting into said drain passage, ?~. .
~;
'
-2 ;
~9~Z~5 c) a closure in alignment with said drain phssage, the en-tirety of the closure retained by said member a-t the side thereof closest to the tubing bo~e interior, the closure adapted to close.off said -tubing wall bore, the closure adapted to be blown out said drain passage when fluid pressure in the tubing bore transmits sufficient force via said closure to rupture said member, d) and a sealing washer to be located in said counterbore, and exte.nding about said closure to have sealing engagement therewith in response ~o pressure exerted Qn the washer by the fluid in said tubing.
As will be seen, the annular retainer has simple thxeaded connection to the counterbore to retain the washer and closure piston in position so as to be easily removable upon unthreading of the retainer from the counterbore, and the piston is typically entirely located or confined at the tubing bore side of the retaining member in the form of a shear pin.
These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from t~e following description and drawings in which:
DRAWING DESCRIPTION
Fig. 1 is a vertical section through sub in a pipe or tubing string, and Fig. 2 is a fragmentary horizontal section taken on lines 2-2 of Fig. 1.
~:2~
DETAILED DESCRIPTION
~ n Fig. 1 a pipe or tubing string 10 includes a tubu-lar sub 11 having an externally threaded pin lla connected at 12 wi-th box 13 of lower pipe or t~biny 1~, and an internally threaded box llb connected at lS with pin 16 of upper pip~ or tubing 17. At times, ik is desired that the fluid in the tubing be released to the tubing exteri.or or annulus 19, wit.hin well 20.
In accordance with the invention, a tubing drain assembly 21 is provided in the wall of the tubing, for automatically draining the fluid pressure when it reach~s a predetermined level. ~he wall contai.ns a cylindrical bore 22 and cylindrical counterbore 23, these being coaxial, the bore 22 intersecting the tubing interior 18, and the coun~erbore intersectin~ th~.tubing interior 19. An annular shoulder 24 demarks the intersection of the bore and counterbore.
The drain assen~ly includes an annular retainer 25 in the couI~terbore and havirlg conllection to -I:he tubin~
wall. Such connection may be afforded by threadin~ a~ 26,`
and the outer end of the retainer may be slotted at 27 to receive a tool to rotate the rekainer into or out of position, thus facilitating qui~k disassembly and clean-out, or replacement, of the drain assembly. The retainer carries a retaining member such as a shear pin 28 projecting into a central drain passa~e 29 formed by the annular retainer.
, .
'75 Pin 28 pxeferably ex-tends completely across passage 29 and is supported in drilled openings 30 in opposite sides of the retainer.
The ass~emblY also includes a closwre, as for example disc-shaped piston 31, partly received in bore portion 32 formed by the retainer, at the side of the pin closesk to the sub in-terior 18. The closure inner face 31a typically firmly engages shoulder 24, whereas its outer face 31b firmly engages pin 28. Also, the closure closes off the tubing wall bore 22. A sealing washer 33 is located in counterbore 23 be-tween the inner end 25a of the closure and the radially outer portion o shoulder 24, to seal about the radially outer cylindrical surface 31c of the piston closure Fluid pressure within the sub interior 18, gaining access to the inner face 33a i of the washer 33, s~ueezes it toward the retainer 25, causing the inner diameter of the washer to increase its sealing engagement with the piston and also with the retainer face 25a. This prevents leak~ge from the drain prior to sudden rupture of the assembly. Washer 33 is typically elastomeric, and may consist of rubber.
Such rupture occurs when the fluid pressure reaches a predetermined level, or level range, characterized in t~at fluid pressure exerted on the piston face 31a causes the piston to shear or fracture the pin 28. At such time, the piston, and ruptured pin extent at the outer side of the piston are blown out the drain passage 29, to the exterior, to relieve the pressure in the sub.
Of unusual advantage are the simplicity and effectiveness of the assembly construction and mode oE
7$
operation, as described, as well as the ease of replacement or repair. Thus, the user may quickly unscrew the retainer 25 and remove the elements 31 and 33. The Eractured pin remnants may be removed from the retainer and replaced by a new pin, and the par-ts quickly returned -to the counterbore 23. The fewer number of par-ts, as compared wlth prior devices, contributes to these advantages and results. The fact that the piston is entirely confined at the sub interior side of the rupturable pin contributes to enhanced simplicity, and ease of parts removal and - replacement, as well as assured pin rupture at predetermined pressure level.
The outer diameter of circular disc or piston 21 is slightly less than the inner diameter or bore diameter 40 of the retainer, to facilitate blow-out o~ the piston.
~9~Z~5 c) a closure in alignment with said drain phssage, the en-tirety of the closure retained by said member a-t the side thereof closest to the tubing bo~e interior, the closure adapted to close.off said -tubing wall bore, the closure adapted to be blown out said drain passage when fluid pressure in the tubing bore transmits sufficient force via said closure to rupture said member, d) and a sealing washer to be located in said counterbore, and exte.nding about said closure to have sealing engagement therewith in response ~o pressure exerted Qn the washer by the fluid in said tubing.
As will be seen, the annular retainer has simple thxeaded connection to the counterbore to retain the washer and closure piston in position so as to be easily removable upon unthreading of the retainer from the counterbore, and the piston is typically entirely located or confined at the tubing bore side of the retaining member in the form of a shear pin.
These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from t~e following description and drawings in which:
DRAWING DESCRIPTION
Fig. 1 is a vertical section through sub in a pipe or tubing string, and Fig. 2 is a fragmentary horizontal section taken on lines 2-2 of Fig. 1.
~:2~
DETAILED DESCRIPTION
~ n Fig. 1 a pipe or tubing string 10 includes a tubu-lar sub 11 having an externally threaded pin lla connected at 12 wi-th box 13 of lower pipe or t~biny 1~, and an internally threaded box llb connected at lS with pin 16 of upper pip~ or tubing 17. At times, ik is desired that the fluid in the tubing be released to the tubing exteri.or or annulus 19, wit.hin well 20.
In accordance with the invention, a tubing drain assembly 21 is provided in the wall of the tubing, for automatically draining the fluid pressure when it reach~s a predetermined level. ~he wall contai.ns a cylindrical bore 22 and cylindrical counterbore 23, these being coaxial, the bore 22 intersecting the tubing interior 18, and the coun~erbore intersectin~ th~.tubing interior 19. An annular shoulder 24 demarks the intersection of the bore and counterbore.
The drain assen~ly includes an annular retainer 25 in the couI~terbore and havirlg conllection to -I:he tubin~
wall. Such connection may be afforded by threadin~ a~ 26,`
and the outer end of the retainer may be slotted at 27 to receive a tool to rotate the rekainer into or out of position, thus facilitating qui~k disassembly and clean-out, or replacement, of the drain assembly. The retainer carries a retaining member such as a shear pin 28 projecting into a central drain passa~e 29 formed by the annular retainer.
, .
'75 Pin 28 pxeferably ex-tends completely across passage 29 and is supported in drilled openings 30 in opposite sides of the retainer.
The ass~emblY also includes a closwre, as for example disc-shaped piston 31, partly received in bore portion 32 formed by the retainer, at the side of the pin closesk to the sub in-terior 18. The closure inner face 31a typically firmly engages shoulder 24, whereas its outer face 31b firmly engages pin 28. Also, the closure closes off the tubing wall bore 22. A sealing washer 33 is located in counterbore 23 be-tween the inner end 25a of the closure and the radially outer portion o shoulder 24, to seal about the radially outer cylindrical surface 31c of the piston closure Fluid pressure within the sub interior 18, gaining access to the inner face 33a i of the washer 33, s~ueezes it toward the retainer 25, causing the inner diameter of the washer to increase its sealing engagement with the piston and also with the retainer face 25a. This prevents leak~ge from the drain prior to sudden rupture of the assembly. Washer 33 is typically elastomeric, and may consist of rubber.
Such rupture occurs when the fluid pressure reaches a predetermined level, or level range, characterized in t~at fluid pressure exerted on the piston face 31a causes the piston to shear or fracture the pin 28. At such time, the piston, and ruptured pin extent at the outer side of the piston are blown out the drain passage 29, to the exterior, to relieve the pressure in the sub.
Of unusual advantage are the simplicity and effectiveness of the assembly construction and mode oE
7$
operation, as described, as well as the ease of replacement or repair. Thus, the user may quickly unscrew the retainer 25 and remove the elements 31 and 33. The Eractured pin remnants may be removed from the retainer and replaced by a new pin, and the par-ts quickly returned -to the counterbore 23. The fewer number of par-ts, as compared wlth prior devices, contributes to these advantages and results. The fact that the piston is entirely confined at the sub interior side of the rupturable pin contributes to enhanced simplicity, and ease of parts removal and - replacement, as well as assured pin rupture at predetermined pressure level.
The outer diameter of circular disc or piston 21 is slightly less than the inner diameter or bore diameter 40 of the retainer, to facilitate blow-out o~ the piston.
Claims (6)
1. In an oil well tubing drain assembly, a) a tubing wall containing a bore intersecting the tubing interior and a counterbore intersecting the tubing exterior, b) an annular retainer in the counterbore having connection to said wall, the retainer forming a side drain passage, c) a retaining member carried by the retainer and projecting into said drain passage, said retaining member comprising a pin extending across said drain passage and received in drilled passages in the retainer, d) a closure in alignment with said drain passage and retained by said member with a surface of the closure located at the side of said member closest to the tubing bore interior, the closure closing off said tubing wall bore, the closure adapted to be blown out said drain passage when fluid pressure in the tubing bore transmits sufficient force via said closure to rupture said member, said closure comprising a disc-shaped piston having a diameter approximately the same as the diameter of said drain passage, e) and a sealing washer located in said counterbore and extending about said closure to have sealing engagement therewith in response to pressure exerted on the washer by the fluid in said tubing, said washer being elastomeric and located in engagement with the end of said retainer closest to the tubing bore interior.
2. The assembly of claim 1 wherein the annular retainer has threaded connection to said counterbore.
3. The assembly of claim 1 wherein the washer has an inner diameter approximately the same as the outer diameter of said piston.
4 The assembly of claim 1 including a tubular sub defining said wall, the sub having threaded pin and box ends for connection in a string of oil wall tubing.
5. The assembly of claim 1 wherein the piston is entirely confined at the side of the pin closest the tubing bore interior.
6. In a well tubing drain assembly to be received in a tubing wall containing a bore intersecting the tubing interior and a counterbore intersecting the tubing exterior, the assembly comprising a) an annular retainer receivable in the counterbore for connection to said wall, the retainer forming a drain passage, b) a retaining member carried by the retainer and projecting into said drain passage, said retaining member comprising a pin extending across said drain passage and received in drilled passages in the retainer, c) a closure in alignment with said drain passage, the entirety of the closure retained by said member with a surface of the closure located at the side of said member closest to the tubing bore interior, the closure adapted to close off said tubing wall bore, the closure adapted to be blown out said drain passage when fluid pressure in the tubing bore transmits sufficient force via said closure to rupture said member, said closure comprising a disc-shaped piston having a diameter approximately the same as the diameter of said drain passage, d) and a sealing washer to be located in said counterbore, and extending about said closure to have sealing engagement therewith in response to pressure exerted on the washer by the fluid in said tubing, said washer being elastomeric and located in engagement with the end of said retainer closest to the tubing bore interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA339,843A CA1127075A (en) | 1979-11-14 | 1979-11-14 | Tubing drain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA339,843A CA1127075A (en) | 1979-11-14 | 1979-11-14 | Tubing drain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127075A true CA1127075A (en) | 1982-07-06 |
Family
ID=4115613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA339,843A Expired CA1127075A (en) | 1979-11-14 | 1979-11-14 | Tubing drain |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1127075A (en) |
-
1979
- 1979-11-14 CA CA339,843A patent/CA1127075A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |