CN2597659Y - Tail pipe ball trap locking device - Google Patents
Tail pipe ball trap locking device Download PDFInfo
- Publication number
- CN2597659Y CN2597659Y CNU022889000U CN02288900U CN2597659Y CN 2597659 Y CN2597659 Y CN 2597659Y CN U022889000 U CNU022889000 U CN U022889000U CN 02288900 U CN02288900 U CN 02288900U CN 2597659 Y CN2597659 Y CN 2597659Y
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- ball device
- ball
- sleeve
- catch
- locking bed
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- Expired - Lifetime
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Abstract
The utility model provides a liner ball catching locking device relating to a liner cementing ball catching locking device in well drilling process, the utility model consists of three main parts a ball catcher assembly, a locking support assembly and a baffle, and a plurality of components such as a ball catcher shell, a ball catcher body, a sleeve, a sleeve cutting nail, a pastern bowl, a ball baffle, a cutting cover, a locking support shell and a locking support body. When in the process of liner cementing in well with big pitch and the horizontal well, the ball can be easily caught and can ensure fixing in the device, which realizes the sealing and pressure building and hanging. The locking device can prevent back pressing after the cement being injected, the attachments have good performance of drilling. The utility model can be used for cementing in petroleum well drilling industry.
Description
Technical field:
The utility model relates to the sealing device in a kind of well-drilling borehole, and what relate more specifically to be used for drilling liner cementing catches the ball locking device.
Background technology:
In petroleum drilling technology, the drilling liner cementing technology is increasingly mature and be used widely.But conventional hydraulic pressure extension hanger uses in high angle hole, horizontal well and remains in certain limitation, because the common hole deviation of this class well near or greater than 90 °, give built the pressure normally, the shackle of seat extension, cementing, running tool and propose all to bring very big difficulty.Conventional hydraulic pressure extension hanger is applied to horizontal well, its difficult point is the build-up pressure difficulty, because ball seat is connected the bottom of tail pipe string usually, be positioned at the horizontal segment or the high angle hole section of well, pitching is trapped in certain box cupling place of horizontal segment tail pipe easily, and be difficult to arrive smoothly the locking bed position, can't implement to build the pressure and the seat extension.Each producer is for addressing this problem both at home and abroad, many countermeasures have been found out, if any producer use the bakelite ball to replace original Metal Ball, mode by pumping, make it arrive the ball seat position, on-the-spot proof, this mode poor effect used, sometimes throwing several bakelite balls can not build-up pressure, illustrates that ball fails to arrive sealing station.For addressing the above problem, further enlarge the scope of application of hydraulic pressure extension hanger, improve cementing quality, need exploitation new catch the ball locking device.
Summary of the invention:
The technical problems to be solved in the utility model is:
At not good this problem of fluid pressure type extension hanger result of use in high angle hole and horizontal well, design a kind of tail pipe and caught the ball locking device, it is caught ball portion and is connected in the tail pipe string of hanger bottom, can capture pitching at an easy rate, and ball delivered to the locking bed position of tail pipe lower horizontal, thereby can guarantee to build the pressure and seat is hung the smooth implementation of operation.
The technical solution of the utility model is:
This tail pipe is caught the ball locking device and is comprised and catch ball device assembly 33, locking bed assembly 34 and baffle plate 32, wherein:
The outside of catching ball device assembly 33 be tubular catch ball device shell 2, catch to be equipped with in the ball device shell and catch ball device body 9, catching ball device body interior is cavity; At the outer circumference surface of catching ball device body top and catch between the inwall of ball device shell sleeve 6 is housed, sleeve and catch between the ball device body fixingly by sleeve shear pin 5, at the inwall of catching ball device shell one ladder being arranged is shell shoulder 7, the sleeve lower end withstands on the shell shoulder; At the outer circumference surface of catching ball device body middle part and catch one or more glue bowls 8, the glue bowl external diameter internal diameter greater than following sleeve pipe is housed between the inwall of ball device shell; Make that the glue bowl plays the effect of catching ball device body of setting upright when catching ball device body along the sleeve pipe of outside when descending.
The inner chamber of catching ball device body is equipped with the device 10 of blocking, and the device inner ring of blocking has downward elasticity pawl, ball is passed through from the top down, but can not oppositely move; Guarantee that the ball that drops into can only pass the device of blocking, and can not when hole deviation changes too greatly, migrate backward, thereby avoid causing the ball seal failure that can guarantee that copper ball seat in shear sleeve is steady, the seat of implementing to build the pressure is hung because of gravity effect.The outer rim of device upper end of blocking withstands on catches on the ball device body shoulder 21, and the device lower end of blocking is withstood by shear sleeve 20 cylindraceous; The part of shear sleeve 20 upper surfaces can match with ball and form sealing, and the shear sleeve internal diameter is caught ball device body and fallen less than catching ball device body internal diameter, making ball to pass, and blocks but be sheared cover, and forms sealing with the part of shear sleeve upper surface.Shear sleeve and catch between the ball device body by shear sleeve shear pin 14 fixing;
The outside of locking bed assembly 34 is locking bed shells 25 of tubular, and locking bed body 26 is housed in the shell, and the locking bed body is the inner cylindric part of cavity that is;
Baffle plate 32 is the circular dull and stereotyped of perforate;
Catch ball device assembly 33 and be installed on the sleeve pipe of extension hanger bottom, locking bed assembly 34 is installed in the bunch tube of tail pipe bottom, and baffle plate 32 is installed in more following; After the sleeve shear pin is cut off by pressure, catch ball device body and can descendingly be inserted in the locking bed body; After the shear sleeve shear pin was cut off by pressure, shear sleeve can descendingly pass together with the ball that drops into and catch ball device body and locking bed body, arrives baffle plate, and this moment, fluid can form circulation by the hole of baffle plate.
Described glue bowl 8 lower ends are withstood by pressure cap 13, and pressure cap, is fixed on the glue bowl and catches on the ball device body on the outer circumference surface of catching ball device body 9 with thread connection; When using more than one glue bowl, separation sleeve 22 cylindraceous is housed between the glue bowl, the two ends up and down of glue bowl have the isodiametric section of stretching out respectively, and the section of stretching out that separation sleeve will be gone up lower adhesive bowl is fixed on the outer circumference surface of catching ball device body simultaneously, plays the effect of further fixing glue bowl.
Outer circumference surface at sleeve 6 has one or more annular grooves, and sleeve and body seal circle 4 are housed in the annular groove, with sleeve and catch clearance seal between ball device shell 2 inner peripheral surfaces; Have one or more annular grooves at the outer circumference surface of catching ball device body 9, sleeve and this body sealing ring 3 are housed in the annular groove, with sleeve and catch clearance seal between ball device body 9 outer circumference surfaces; Outer circumference surface at shear sleeve 20 has one or more annular grooves, and shear sleeve sealing ring 18 is housed in the annular groove, with shear sleeve and catch clearance seal between ball device body 9 inner peripheral surfaces.
General anti-unloading device can be: have annular groove on the outer circumference surface of catching ball device body 9 bottoms, the metallic elastic ring of opening is housed in the annular groove, the outer wall of elastic ring is the inclined-plane, the posterior end external diameter is installed less than catching this body diameter of ball device, upper end external diameter internal diameter greater than locking bed body 26 endoporus; When catch ball device body when inserting locking bed body endoporus, elastic ring shrinks, when arriving locking bed endoporus annular groove 31, elastic ring opens, snaps in the annular groove, make and catch ball device body and can not withdraw from.
Catch ball device assembly and the locking bed assembly is connected in the bunch tube, internal thread or external screw thread are arranged respectively, internal thread or external screw thread are arranged respectively, can cooperate with respective threads on the sleeve pipe at the two ends up and down of locking bed shell at the two ends up and down of catching ball device shell.
There is tooth embedding 17 lower end of catching ball device body 9, at the hypomere of locking bed body 26 inside, corresponding tooth embedding 30 is arranged, make catch ball device body insert the locking bed body after, the mutual interlock of tooth embedding, prevent to catch ball device body and rotate, so that be convenient to bore when boring annex afterwards.
The inside of catching ball device body 9, catch ball device body shoulder 21 above, a conical section arranged, the internal diameter of conical section top is greater than the internal diameter of below, plays ball that guiding drops into and drops into effect in the device of blocking from the top.
Most of part of this device is formed by drillability materials such as Birmasil, rubber, in the drilling out operation in step down the saving of labor, save time.As the material of catching ball device body, locking bed body, shear sleeve is a Birmasil; The material of glue bowl, sealing ring is a rubber.
The beneficial effects of the utility model are:
Make in high angle hole and the horizontal well drilling liner cementing process, can successfully capture pitching, and guarantee that it is fixed in the device, realize sealing, build the pressure and the seat extension.Design has retaining mechanism, can prevent back pressure behind cemented up.Annex all has good drillability.
Description of drawings:
Fig. 1 is the assembly drawing that a kind of tail pipe is caught the ball locking device.
Fig. 2 is the sectional view of catching ball device assembly.
Fig. 3 is the sectional view of locking bed assembly.
Fig. 4 is the sectional view of baffle plate.
The specific embodiment:
Below describe and only represent a kind of specific embodiment of the present utility model,, and the utility model is not limited just in order further the utility model to be described.
Tail pipe catch the ball locking device by catch ball device assembly 33, locking bed assembly 34, baffle plate 32 totally three parts form, wherein:
The outside of catching ball device assembly 33 be tubular catch ball device shell 2, catch to be equipped with in the ball device shell and catch ball device body 9, catching ball device body interior is cavity; At the outer circumference surface of catching ball device body top and catch between the inwall of ball device shell sleeve 6 is housed, catch ball device outer casing sleeve and catch between the ball device body fixing by sleeve shear pin 5, at the inwall of catching ball device shell one ladder being arranged is shell shoulder 7, and the sleeve lower end withstands on the shell shoulder; Between the outer circumference surface of catching ball device body middle part and the inwall of catching ball device shell three glue bowls 8 are housed, glue bowl external diameter is slightly larger than the internal diameter of following sleeve pipe, and feasible when catching ball device body along the sleeve pipe of outside when descending, the glue bowl plays the effect of catching ball device body of setting upright;
The inner chamber of catching ball device body is equipped with the device 10 of blocking, and the device inner ring of blocking has downward elasticity pawl, ball is passed through from the top down, but can not oppositely move; Guarantee that the ball that drops into can only pass the device of blocking, and can not when hole deviation changes too greatly, migrate backward, thereby avoid causing the ball seal failure that can guarantee that copper ball seat in shear sleeve is steady, the seat of implementing to build the pressure is hung because of gravity effect.The outer rim of device upper end of blocking withstands on catches on the ball device body shoulder 21, and the device lower end of blocking is withstood by shear sleeve 20 cylindraceous; The part of shear sleeve 20 upper surfaces and ball match and form sealing, the shear sleeve internal diameter is less than catching ball device body internal diameter, making a diameter can pass less than the ball of catching ball device body internal diameter catches ball device body and falls, but the shear sleeve littler than ball by diameter blocks, and forms sealing with the part of shear sleeve upper surface.Shear sleeve and catch between the ball device body by shear sleeve shear pin 14 fixing;
The outside of locking bed assembly 34 is locking bed shells 25 of tubular, and locking bed body 26 is housed in the shell, and the locking bed body is the inner cylindric part of cavity that is;
Baffle plate 32 is the circular dull and stereotyped of perforate;
Catch ball device assembly 33 and be installed on the sleeve pipe of extension hanger bottom, generally be placed in the less well section of straight well section or gradient; Locking bed assembly 34 is installed in the bunch tube of tail pipe bottom, specifically is to be placed on the sleeve pipe of following high angle hole section; Baffle plate 32 is installed on the more following float collar in the square casing.After the sleeve shear pin is cut off by pressure, catch that ball device body is descending to be inserted in the locking bed body; After the shear sleeve shear pin was cut off by pressure, shear sleeve was caught ball device body and locking bed body together with descending the passing of ball of dropping into, and arrived baffle plate, was blocked by baffle plate, and circulation of fluid is blocked in the unlikely shaft bottom of falling; This moment, fluid can form circulation by the hole of baffle plate.
Withstood by pressure cap 13 in glue bowl 8 lower ends, pressure cap, is fixed on the glue bowl and catches on the ball device body on the outer circumference surface of catching ball device body 9 with thread connection; Separation sleeve 22 cylindraceous is housed between the adjacent glue bowl, the two ends up and down of glue bowl have the isodiametric section of stretching out respectively, the separation sleeve internal diameter equals the external diameter of the glue bowl section of stretching out substantially, the section of stretching out that separation sleeve will be gone up lower adhesive bowl is fixed on the outer circumference surface of catching ball device body simultaneously, plays the effect of further fixing glue bowl.
Outer circumference surface at sleeve 6 has an annular groove, and sleeve and body seal circle 4 are housed in the annular groove, with sleeve and catch clearance seal between ball device shell 2 inner peripheral surfaces; Have an annular groove at the outer circumference surface of catching ball device body 9, sleeve and this body sealing ring 3 are housed in the annular groove, with sleeve and catch clearance seal between ball device body 9 outer circumference surfaces; Outer circumference surface at shear sleeve 20 has an annular groove, and shear sleeve sealing ring 18 is housed in the annular groove, with shear sleeve and catch clearance seal between ball device body 9 inner peripheral surfaces.
Used anti-unloading device is: have annular groove on the outer circumference surface of catching ball device body 9 bottoms, the metallic elastic ring of opening is housed in the annular groove, the outer wall of elastic ring is the inclined-plane, the posterior end external diameter is installed less than catching this body diameter of ball device, upper end external diameter internal diameter greater than locking bed body 26 endoporus; When catch ball device body when inserting locking bed body endoporus, elastic ring shrinks, when arriving locking bed endoporus annular groove 31, elastic ring opens, snaps in the annular groove, make and catch ball device body and can not withdraw from.
Catch ball device assembly and the locking bed assembly is connected in the bunch tube, have internal thread, lower end that external screw thread is arranged, have internal thread, lower end that external screw thread is arranged, can cooperate with respective threads on the sleeve pipe in the upper end of locking bed shell in the upper end of catching ball device shell.
Locking bed body 26 usefulness thread connection on the outer circumference surface of locking bed body bottom, screw thread below, have an annular groove in locking bed shell 25, this body sealing ring of locking bed 28 is housed, with the clearance seal between locking bed body and the locking bed shell in the annular groove.
There is tooth embedding 17 lower end of catching ball device body 9, at the hypomere of locking bed body 26 inside, corresponding tooth embedding 30 is arranged, make catch ball device body insert the locking bed body after, the mutual interlock of tooth embedding, prevent to catch ball device body and rotate, so that be convenient to bore when boring annex afterwards.
The inside of catching ball device body 9, catch ball device body shoulder 21 above, a conical section arranged, the internal diameter of conical section top is greater than the internal diameter of below, plays ball that guiding drops into and drops into effect in the device of blocking from the top.
The material of catching ball device body, locking bed body, shear sleeve of this device is a Birmasil; The material of glue bowl, sealing ring is a rubber.
Trying one's best extension hanger 44 during use and catching ball device assembly 33 is placed in straight well section or the less well section of gradient, and the arrangement mode of ordinary circumstance lower tubular column is:
Extension hanger 44+ short sleeve+catch ball device assembly 33+ sleeve combination+locking bed assembly 34+ sleeve pipe+baffle plate 32+ sleeve pipe+float collar+sleeve pipe+float shoe.
With under the tubing string behind the precalculated position, press normal procedure, from well head pitching 40, and with the pumping of float amount.
When pump pressure begins to rise, illustrate that pitching has arrived the position of catching the ball device, carefully build the pressure to 8～11MPa, slowly transfer drilling tool after 2 minutes, when total suspending weight drops to when equaling to veer away the drilling tool gross weight, seat is hung successfully.
Continue to build the pressure to 12～13MPa, catch ball device outer casing sleeve and the sleeve shear pin of catching between the ball device body is cut off, pumping is afterwards caught ball device body to locking bed position, bottom, and catch ball device body and insert locking bed body endoporus, tooth embedding interlock, the anti-back device blocks.Continue to build the pressure to 16～17MPa, the shear sleeve shear pin is cut off again, and shear sleeve, the device of blocking are descending together with ball, fall on the baffle plate, and it is unimpeded to circulate.
Claims (9)
1 one kinds of tail pipes are caught the ball locking device, and this locking device comprises catches ball device assembly (33), locking bed assembly (34) and baffle plate (32), it is characterized in that:
The outside of catching ball device assembly (33) be tubular catch ball device shell (2), catch to be equipped with in the ball device shell and catch ball device body (9), catching ball device body interior is cavity; At the outer circumference surface of catching ball device body top and catch between the inwall of ball device shell sleeve (6) is housed, sleeve and catch between the ball device body by sleeve shear pin (5) fixing, at the inwall of catching ball device shell one ladder being arranged is shell shoulder (7), and the sleeve lower end withstands on the shell shoulder; At the outer circumference surface of catching ball device body middle part and catch one or more glue bowls (8), the glue bowl external diameter internal diameter greater than following sleeve pipe is housed between the inwall of ball device shell;
The inner chamber of catching ball device body is equipped with the device of blocking (10), and the device inner ring of blocking has downward elasticity pawl, ball is passed through from the top down, but can not oppositely move; The outer rim of device upper end of blocking withstands on catches on the ball device body shoulder (21), and the device lower end of blocking is withstood by shear sleeve cylindraceous (20); The part of shear sleeve (20) upper surface can match with ball and form sealing, and the shear sleeve internal diameter is less than catching ball device body internal diameter, and shear sleeve is fixed by shear sleeve shear pin (14) with catching between the ball device body;
The outside of locking bed assembly (34) is the locking bed shell (25) of tubular, and locking bed body (26) is housed in the shell, and the locking bed body is the inner cylindric part of cavity that is;
Baffle plate (32) is the circular dull and stereotyped of perforate;
Catch ball device assembly (33) and be installed on the sleeve pipe of extension hanger bottom, locking bed assembly (25) is installed in the bunch tube of tail pipe bottom, and baffle plate (32) is installed in more following; After the sleeve shear pin is cut off by pressure, catch ball device body and can descendingly be inserted in the locking bed body; After the shear sleeve shear pin was cut off by pressure, shear sleeve can descendingly pass together with the ball that drops into and catch ball device body and locking bed body, arrives baffle plate, and this moment, fluid can form circulation by the hole of baffle plate.
2 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: described glue bowl (8) lower end is withstood by pressure cap (13), pressure cap with thread connection on the outer circumference surface of catching ball device body (9); Separation sleeve cylindraceous (22) is housed between the more than one glue bowl, and the two ends up and down of glue bowl have the isodiametric section of stretching out respectively, and the section of stretching out that separation sleeve will be gone up lower adhesive bowl is fixed on the outer circumference surface of catching ball device body simultaneously.
3 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: the outer circumference surface at sleeve (6) has one or more annular grooves, sleeve and body seal circle (4) are housed, with sleeve and catch clearance seal between ball device shell (2) inner peripheral surface in the annular groove; Have one or more annular grooves at the outer circumference surface of catching ball device body (9), sleeve and this body sealing ring (3) are housed in the annular groove, with sleeve and catch clearance seal between ball device body (9) outer circumference surface; Outer circumference surface at shear sleeve (20) has one or more annular grooves, and shear sleeve sealing ring (18) is housed in the annular groove, with shear sleeve and catch clearance seal between ball device body (9) inner peripheral surface.
4 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: anti-unloading device (16) is arranged on the outer circumference surface of catching ball device body (9) bottom, on the outer circumference surface of catching ball device body (9) bottom, the top of anti-unloading device, have one or more annular grooves, be equipped with in the annular groove and catch ball device and locking bed sealing ring (15), on the inner peripheral surface on locking bed body (26) top, have locking bed endoporus annular groove (31); Make when catch ball device body insert locking bed body endoporus after, prevent that unloading device can snap in the annular groove, will catch ball device body and the locking bed body is bound up, and will catch the clearance seal between ball device body (9) outer circumference surface and locking bed body (26) inner peripheral surface simultaneously.
5 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: at the two ends up and down of catching ball device shell internal thread or external screw thread are arranged respectively, at the two ends up and down of locking bed shell internal thread or external screw thread are arranged respectively.
6 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: locking bed body (26) uses thread connection in locking bed shell (25), on the outer circumference surface of locking bed body bottom, screw thread below, have one or more annular grooves, locking this body sealing ring (28) is housed, with the clearance seal between locking bed body and the locking bed shell in the annular groove.
7 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: there is tooth embedding (17) lower end of catching ball device body (9), at the inner hypomere of locking bed body (26), corresponding tooth embedding (30) is arranged, make catch ball device body insert the locking bed body after, the mutual interlock of tooth embedding, prevent to catch ball device body and rotate.
8 tail pipes according to claim 1 are caught the ball locking device, it is characterized in that: in the inside of catching ball device body (9), catch ball device body shoulder (21) the top, a conical section is arranged, the internal diameter of conical section top is greater than the internal diameter of below.
9 tail pipes according to claim 4 are caught the ball locking device, it is characterized in that described anti-unloading device is: on the outer circumference surface of catching ball device body (9) bottom, have annular groove, the metallic elastic ring of opening is housed in the annular groove, the outer wall of elastic ring is the inclined-plane, the posterior end external diameter is installed less than catching this body diameter of ball device, upper end external diameter internal diameter greater than locking bed body (26) endoporus; When catch ball device body when inserting locking bed body endoporus, elastic ring shrinks, when arriving locking bed endoporus annular groove (31), elastic ring opens, snaps in the annular groove, make and catch ball device body and can not withdraw from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022889000U CN2597659Y (en) | 2002-11-28 | 2002-11-28 | Tail pipe ball trap locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022889000U CN2597659Y (en) | 2002-11-28 | 2002-11-28 | Tail pipe ball trap locking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2597659Y true CN2597659Y (en) | 2004-01-07 |
Family
ID=34151208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU022889000U Expired - Lifetime CN2597659Y (en) | 2002-11-28 | 2002-11-28 | Tail pipe ball trap locking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2597659Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482001B (en) * | 2008-01-11 | 2012-05-23 | 中国石油化工股份有限公司 | Rubber plug system used for drilling liner cementing of horizontal well |
| CN103308260A (en) * | 2012-03-08 | 2013-09-18 | 中国石油化工股份有限公司 | Pressure bearing detection device and method of one-way valve |
| CN107120088A (en) * | 2016-02-25 | 2017-09-01 | 中国石油化工股份有限公司 | Seal receptacle and ball sealer |
| CN107178353A (en) * | 2017-07-13 | 2017-09-19 | 重庆峰丽能源技术有限公司 | A kind of well head catches ball device |
-
2002
- 2002-11-28 CN CNU022889000U patent/CN2597659Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482001B (en) * | 2008-01-11 | 2012-05-23 | 中国石油化工股份有限公司 | Rubber plug system used for drilling liner cementing of horizontal well |
| CN103308260A (en) * | 2012-03-08 | 2013-09-18 | 中国石油化工股份有限公司 | Pressure bearing detection device and method of one-way valve |
| CN103308260B (en) * | 2012-03-08 | 2015-08-12 | 中国石油化工股份有限公司 | The pressure-bearing pick-up unit of retaining valve and method |
| CN107120088A (en) * | 2016-02-25 | 2017-09-01 | 中国石油化工股份有限公司 | Seal receptacle and ball sealer |
| CN107178353A (en) * | 2017-07-13 | 2017-09-19 | 重庆峰丽能源技术有限公司 | A kind of well head catches ball device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121128 Granted publication date: 20040107 |