CN101852070A - Pressure balancing inclined plane locking-type gradually deblocking packer - Google Patents
Pressure balancing inclined plane locking-type gradually deblocking packer Download PDFInfo
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Abstract
The invention relates to a pressure balancing inclined plane locking-type gradually deblocking packer, mainly aiming at solving the problems of poor safety, less packer connecting number and difficult deblocking of the existing packer. The pressure balancing inclined plane locking-type gradually deblocking packer is characterized in that the upper end of a central pipe (3) is connected with a central pipe joint (16); a reversed L-shaped opening (17) is arranged under an upper joint (13); a boss (19) arranged outside the central pipe joint (16) is arranged inside the opening (17) of the upper joint (13), and is connected by a pin (23); a right inclined plane (20) under the boss (19) is inosculated with a lower guide inclined plane (18) of the opening (17); a locking block (21) on a balance piston (14) is positioned inside opening (17); the right of the upper end of the locking block (21) is provided with a guide inclined plane (27) inosculated with a left inclined plane (22) under the boss; and the wall of the central pipe (3) at the lower end of the balance piston (14) is provided with a through hole (24). The pressure balancing inclined plane locking-type gradually deblocking packer has the characteristics of safety, reliability, more connecting number and easy deblocking.
Description
Technical field:
The present invention relates to oil recovery field, oil field water injection well used packer, especially pressure balancing inclined plane locking-type gradually deblocking packer.
Background technology:
Along with Oilfield developing, in same well, need more oil-bearing stratum flooding, to improve recovery ratio.The subdivision injection in Here it is oil field, subdivision injection just need connect the packer of a greater number on water injection string, by the packer oil-separating layer.And the technical pattern of present packer generally is that the deblocking pin while also is to set pin, be used for pinning whole setting mechanism when setting, keep the packing element compression, realize the release of packing element by cutting off this pin during deblocking. in practicality for many years, there is such problem always; If this pin is smaller, when the injecting process China and foreign countries' voltage rise was high, pin usually can be cut off automatically packer was lost efficacy, and then causes tubing string to lose efficacy, and causes normally seperated layer water injection; Reliable in order to guarantee packer, have no alternative but adopt the way that strengthens pin, this has just produced another technical problem again, and the pin shearing force increases, and each grade packer deblocking power is increased, connecting this packer on the water injection string makes tubing string become as a whole rigid body, the tubing string upper lifting force is whole packer deblocking power sums, and the tubing string upper lifting force is increased gradually, causes the deblocking difficulty, thereby cause the packer quantity that connects on the water injection string to be restricted, be generally about 4 grades.It is difficult that unsealing operation also just becomes.Some tubing strings that are lowered to multiple-string packer pull out the motionless large-scale well workover that causes during often because of well, having a strong impact on the oil field normally develops, and caused the very big wasting of resources. have again, the packer of this structure is through can't stand the interlayer high pressure, can cut off deblocking pin deblocking automatically, packer and tubing string were lost efficacy, so both the incompatibility subdivision injection also was not content with high-pressure water injection well.
Summary of the invention:
Conciliate offset nail integrative-structure in order to solve existing packer setting pin, and pin Xiao Yi deblocking that causes and pin easy deblocking very much not, can not adapt to the technical problem of the above tubing string of subdivision injection Pyatyi packer.The invention provides a kind of pressure balancing inclined plane locking-type gradually deblocking packer.This pressure balancing inclined plane locking-type gradually deblocking packer has independently setting mechanism and conciliates sealing mechanism, and packer has the part elongation when separating the sealing mechanism deblocking, and packer can independent stressed deblocking during deblocking, therefore realizes the gradually deblocking of tubing string packer.Safe and reliable under condition of high voltage, increase water injection string upper packer number of connection, the tubing string upper lifting force reduces, unsealing operation and characteristic of simple structure.
Technical scheme of the present invention is: this pressure balancing inclined plane locking-type gradually deblocking packer comprises well-flushing mechanism, separates sealing mechanism and setting mechanism, it is characterized in that:
Above-mentioned setting mechanism comprises lower outer pipe, lower contact, exterior central tube, central tube, set piston, promote cover, following throw-out collar, packing element and lock tube, the lower end of described central tube and lower outer pipe is connected with lower contact by screw thread respectively, described exterior central tube is with packing element outward, the lower end of described packing element is with down throw-out collar, the upper end of described promotion cover is enclosed within down on the stage of throw-out collar, promotion puts delivery port on the end wall, promoting has downward-sloping Nei Kaya in the cover lower end, the bottom that promotes cover is enclosed within the lower outer pipe, the described piston that sets places promotion cover lower end, set on the center tube wall of piston lower end inlet opening is arranged, set in the piston inside-and-outside ring groove and be filled with sealing ring, described lock tube is fixed on outside the central tube of exterior central tube lower end, and lock tube has acclivitous wild card tooth outward;
The above-mentioned sealing mechanism of separating comprises upper exterior tube, top connection, dummy piston, connector and central tube joint, described upper exterior tube is connected with top connection by screw thread, described central tube upper end is connected with the central tube joint by screw thread, described top connection lower shaft is to L shaped gap is arranged down, below curving, gap is low right high inclined-plane, a left side, described central tube joint is evenly equipped with boss outward, the following of boss formed to lower inclined plane by 2, boss places in the gap, right tilted surface below the boss and gap curve following inclined-plane and match, be filled with sealing ring in the annular groove of contact surface in central tube joint top and the top connection, annular stage is arranged in the described connector, secondary annular stage is arranged outward, the outermost stage is enclosed within the upper exterior tube, inner step is enclosed within outside the exterior central tube, described dummy piston upper surface has the lock dog that places in the gap, there is the inclined-plane that draws that the left tilted surface below boss matches on the right side, lock dog upper end, be enclosed within outside the central tube and and connect by pin, on the center tube wall of dummy piston lower end through hole is arranged, be filled with sealing ring respectively in the dummy piston inside-and-outside ring groove;
Above-mentioned well-flushing mechanism comprises the well-flushing piston, described well-flushing piston places in the cavity that the upper exterior tube of dummy piston lower end and central tube form, the well-flushing piston has annular stage in the lower end, and be enclosed within outside the annular stage of the connector second level, on the upper exterior tube wall of the corresponding connector second level annular stage liquid pass hole is arranged, well-flushing piston annular stage inner face is equipped with sealing ring, is filled with sealing ring respectively in the annular groove of well-flushing piston and upper exterior tube and central tube contact surface.
The present invention has following beneficial effect:
This pressure balancing inclined plane locking-type gradually deblocking packer setting mechanism sets piston because employing is put in the cavity between lower outer pipe and central tube, set piston push promote cover and following throw-out collar up, and by lock tube wild card tooth and optimizing structure that promotion cover Nei Kaya locks, make setting mechanism not with separate the sealing mechanism simultaneous, and then make setting mechanism simple and task is single, thereby greatly improved the security reliability of setting mechanism;
Separate sealing mechanism because employing is connected with the central tube joint at central tube, the central tube joint is connected with top connection gap cutting ferrule by boss, and lock by the lock dog on the dummy piston, decomposition pressure balance inclined plane locking-type is separated sealing mechanism, by the inclined-plane on boss, gap and the lock dog weight is decomposed, thereby improve and separate sealing mechanism safety and reliability.It is independent to separate sealing mechanism, and packer has the part elongation when separating the sealing mechanism deblocking, and packer can independent stressed deblocking during deblocking, and the tubing string upper lifting force is single packer deblocking power, therefore realizes the gradually deblocking of tubing string packer.The quantity that water injection string connects packer increases, and upper lifting pipe post power reduces, unsealing operation and simple in structure, and be adapted to high-pressure water injection well.Thus, this pressure balancing inclined plane locking-type gradually deblocking packer has under condition of high voltage safe and reliable, increases number of connection on the water injection string, and upper lifting pipe post power reduces, unsealing operation and characteristic of simple structure.
Description of drawings:
Accompanying drawing 1 is a structural representation of the present invention;
Accompanying drawing 3 is top connection structural representations;
Accompanying drawing 4 is Fig. 3 upward views;
Accompanying drawing 5 is central tube joint design schematic diagrames;
Accompanying drawing 6 is Fig. 5 upward views;
Accompanying drawing 7 is weight exploded views.
1-lower contact among the figure, the 2-lower outer pipe, the 3-central tube, 4-sets piston, and 5-promotes cover, throw-out collar under the 6-, 7-lock tube, 8-exterior central tube, 9-wild card tooth, 10-inlet opening, 11-Nei Kaya, 12-upper exterior tube, 13-top connection, 14-dummy piston, 15-connector, 16-central tube joint, 17-gap, 18-guide ramp, 19-boss, 20-right tilted surface, the 21-lock dog, 22-left tilted surface, 23-pin, 24-through hole, 25-well-flushing piston, the 26-liquid pass hole, 27-draws the inclined-plane, the 28-delivery port.
The specific embodiment:
The invention will be further described below in conjunction with accompanying drawing:
Shown in accompanying drawing, this pressure balancing inclined plane locking-type gradually deblocking packer comprises well-flushing mechanism, separates sealing mechanism and setting mechanism, it is characterized in that:
Above-mentioned setting mechanism comprises lower outer pipe 2, lower contact 1, exterior central tube 8, central tube 3, sets piston 4, promotes cover 5, descends throw-out collar 6, packing element and lock tube 7.
Described lower outer pipe 2 is a tubulose, and there is the Taper Pipe internal thread lower end.
The upper and lower side of described lower contact 1 has external screw thread respectively, and upper external screw thread is connected with lower outer pipe 2, and the lower end external screw thread is connected with tubing string, and the upper end also has internal thread and is connected with central tube 3.
Described exterior central tube 8 is a tubulose, is with packing element outward.
Described central tube 3 is a tubulose, and there are annular boss and fixing lock tube 7 thereon in the middle part.
The described piston 4 of setting is ring-type, is filled with sealing ring in the inside-and-outside ring groove, in step hole is arranged, and internal thread is arranged, be used for connecting and promote cover 5.
Described promotion cover 5 is a tubulose, and annular boss is arranged outside the upper end, and delivery port 28 is arranged on the boss wall, plays restriction falling effect, and downward-sloping interior card tooth 11 is arranged in the lower end, and the lower end stage has screw thread outward.
Described throw-out collar 6 down is a tubulose, and stage is arranged outside the lower end, is connected in socket and promotes cover 5.
Described lock tube 7 is a tubulose, and acclivitous wild card tooth 9 is arranged outward, in screw thread is arranged, be used for being connected with central tube 3.
The lower end of central tube 3 and lower outer pipe 2 is connected with lower contact 1 by screw thread respectively, thus the cavity that forms between central tube 3 and lower outer pipe 2.Be with packing element outside the exterior central tube 8, the lower end of packing element is with down throw-out collar 6, utilizes throw-out collar 6 protection packing elements down.The upper end that promotes cover 5 is enclosed within down on the stage of throw-out collar 6, and promoting has interior card tooth 11 in cover 5 lower ends, promotes cover 5 bottoms and is enclosed within the lower outer pipe 2, utilizes promotion cover 5 to transmit motive force and locking.Setting piston 4 places in the cavity of formation between the central tube 3 that promotes cover 5 lower ends and the lower outer pipe 2, set on piston 4 lower end central tubes 3 walls inlet opening 10 is arranged, set in the piston 4 inside-and-outside ring grooves and be filled with sealing ring, utilize inlet opening 10 to provide power fluid for setting piston 4, make to set piston 4 and push and promote to move the compression packing element on the cover 5, realize setting.Lock tube 7 is fixed on outside the central tube 3 of exterior central tube 8 lower ends, utilizes the wild card tooth 9 on the lock tube 7 to match with the interior card tooth 11 that promotes cover 5 lower ends, realizes the locking setting mechanism.
The above-mentioned sealing mechanism of separating comprises upper exterior tube 12, top connection 13, dummy piston 14, connector 15 and central tube joint 16.
Described upper exterior tube 12 is a tubulose, internal thread is arranged respectively in the upper and lower side, the upper end internal thread is connected with top connection 13, the internal thread of lower end is connected with connector 15, on the internal thread end wall of lower end the used through hole of well-flushing 24 is arranged, upper exterior tube 12 mainly plays interconnect function between top connection 13 and connector 15, and forms cavity with central tube 3.
There is internal thread described top connection 13 upper ends, be filled with sealing ring in the central slot, there is external screw thread the lower end, internal thread is connected with tubing string, external screw thread is connected with upper exterior tube 12, is processed with down L shaped gap 17 on the lower part wall, is the low right high guide ramp 18 in a left side below gap 17 curves, and the right tilted surface 20 below boss 19 matches, and forms with central tube joint 16 and separates sealing mechanism.
Described connector 15 is a tubulose, and the secondary stage is arranged outside the top, stage is arranged in the lower end and is enclosed within outside the exterior central tube 8, and top outermost one-level stage has screw thread and is connected with upper exterior tube 12, the sealing that matches with well-flushing piston 25 lower end stages of the second level stage outside the top.Connector 15 plays interconnect function and the effect of protection packing element, and forms the well-flushing switch with well-flushing piston 25.
Described dummy piston 14 is a ring-type, be filled with sealing ring in the inside-and-outside ring groove respectively, there are 4 lock dogs 21 upper surface, there is the inclined-plane of drawing 27 on the right side, lock dog 21 upper end, drawing the left tilted surface 22 of inclined-plane 27 below boss 19 matches, dummy piston 14 mainly plays a part to support lock dog 21, and boss 19 is locked in down in the L shaped gap 17, and the shearing force on the pin 23 is reduced.
Internal thread is arranged in described central tube joint 16 lower ends and be connected with central tube 3, be evenly equipped with 4 boss 19 outside the central tube joint 16, the following of boss 19 formed to lower inclined plane by 2, be left tilted surface 22 and right tilted surface 20, left tilted surface 22 and right tilted surface 20 are used for the gravity of decomposition on boss 19, reduce the shearing force on the pin 23.
Above-mentioned well-flushing mechanism comprises the well-flushing piston.
In the cavity that the upper exterior tube 12 that described well-flushing piston 25 places dummy piston 14 lower ends and central tube 3 form, the well-flushing piston has annular stage in 25 lower ends, and be enclosed within outside the annular stage of connector 15 second level, well-flushing piston 25 annular stages are built-in with sealing ring, guarantee the sealing between well-flushing piston 25 and the connector 15, formed the well-flushing switch, the well-flushing switch is in closed condition when normal water filling.On upper exterior tube 12 walls liquid pass hole 26 is arranged, and be filled with sealing ring in the annular groove on the upper exterior tube 12 contacted well-flushing pistons 25, and be filled with sealing ring in the annular groove of central tube 3 contact surfaces.During well-flushing, by the well-flushing switch opens that well-flushing piston 25 and connector 15 are formed, flushing fluid forms the anti-flushing well passage through liquid pass hole 26, upper exterior tube 12 with the cavity that central tube 3 forms, and realizes anti-flushing well.
Operating principle:
This pressure balancing inclined plane locking-type gradually deblocking packer is connected on the water injection string, is lowered in the water injection well.Set operating process, suppress by ground, water is entered by inlet opening 10 in the cavity that forms between central tube 3 and the lower outer pipe 2, and it is up to promote to set piston 4, set piston 4 push successively promote cover 5 and following throw-out collar 6 up along exterior central tube 8, make the packing element compression-expansion, with the ring set packing, promote the interior card tooth 11 of cover 5 lower ends simultaneously and combine with wild card tooth 9 on the lock tube 7, realize locking, set operation and finish, and task is single.
During normal water filling, because well-flushing piston 25 is closed, water injection pressure produces the power that makes progress all the time to dummy piston 14, make dummy piston 14 lean lower surface in top connection 13, can not be up can not be descending, locked-center union 16, thereby alleviate the downward weight that acts on the dummy piston 14, also just reduced the shearing force on the pin 23, so pin 23 that available diameter is less, to separate sealing mechanism just locked always as long as maintain water injection pressure, final safety and the reliability that guarantees to understand sealing mechanism.
The unsealing operation process, stop water filling, equilibrant force on the central tube joint 16 is damaged, so the power of upper lifting pipe post reduces greatly, with carrying water injection string on the smaller power, during the upper lifting pipe post, uppermost packer is stressed at first, the boss 19 of central tube joint 16 glides along the inclined-plane and rotates the lock dog 21 that pushes on the dummy piston 14, dummy piston 14 is moved down, and lock dog 21 is connected pin 23 with central tube 3 to be cut off, and mechanism's locking is disengaged, central tube joint 16 breaks away from top connection 13, central tube 3 is descending, promotes cover 5 along with lock tube 7 is descending and descending, the packer elongation, final packing element shrinks, and unsealing operation is finished.The next stage packer repeats these actions one by one, and tubing string packer gradually deblocking is to the complete deblocking of tubing string, and the tubing string upper lifting force is single packer deblocking power, so can increase the quantity that tubing string connects packer.
The well-flushing operating process, stop water filling, flushing fluid is entered between upper exterior tube 12 and the central tube 3 in the cavity by liquid pass hole 26, it is up to promote well-flushing piston 25, and when well-flushing piston 25 was up between upper exterior tube 12 and the central tube 3 on the cavity, passage was opened, flushing fluid cavity between exterior central tube 8 and central tube 3 enters, enter subordinate's annular space from delivery port 28 outflows that promote cover 5 upper ends, realize the anti-flushing well circulation, reach the well-flushing purpose through the tubing string bottom.
This pressure balancing inclined plane locking-type gradually deblocking packer is owing to adopt boss 19 to be enclosed within the gap 17, simultaneously by lock dog 21 lockings, the downward weight that acts on central tube joint 16 by boss 19 with draw inclined-plane 27 and decompose, decompose the weight on the lock dog 21, decompose once more by the right tilted surface of lock dog 21 upper ends and the left tilted surface 22 below the boss 19 again, the weight that finally acts on the lock dog 21 reduces greatly, thereby improves the safety of separating sealing mechanism.
The weight decomposition can be got by formula on the boss 19:
F＝SinA.P
Convert through decomposing, the weight decomposition can be got by formula on the lock dog 21:
D＝(P*Sin2A*SinB)/2
P-deblocking power D-deblocking pin allowable force
This pressure balancing inclined plane locking-type gradually deblocking packer was by test in a year, by connecting 4 grades of packers on the water injection string, be increased to more than the 8-9 level, thus the water-injection efficiency and the quality of raising water injection well, and setting mechanism can deblocking under external and internal pressure changes, and adapt to the high pressure water injection needs.
Claims (1)
1. a pressure balancing inclined plane locking-type gradually deblocking packer comprises well-flushing mechanism, separates sealing mechanism and setting mechanism, it is characterized in that:
Above-mentioned setting mechanism comprises lower outer pipe (2), lower contact (1), exterior central tube (8), central tube (3), set piston (4), promote cover (5), following throw-out collar (6), packing element and lock tube (7), the lower end of described central tube (3) and lower outer pipe (2) is connected with lower contact (1) by screw thread respectively, the outer packing element that is with of described exterior central tube (8), the lower end of described packing element is with down throw-out collar (6), the upper end of described promotion cover (5) is enclosed within down on the stage of throw-out collar (6), promoting has delivery port (28) on cover (5) upper end wall, promoting has downward-sloping Nei Kaya (11) in cover (5) lower end, the bottom that promotes cover (5) is enclosed within the lower outer pipe (2), the described piston (4) that sets places promotion cover (5) lower end, set on piston (4) lower end central tube (3) wall inlet opening (10) is arranged, set in piston (4) the inside-and-outside ring groove and be filled with sealing ring, described lock tube (7) is fixed on outside the central tube (3) of exterior central tube (8) lower end, and acclivitous wild card tooth (9) is arranged outside the lock tube (7);
The above-mentioned sealing mechanism of separating comprises upper exterior tube (12), top connection (13), dummy piston (14), connector (15) and central tube joint (16), described upper exterior tube (12) is connected with top connection (13) by screw thread, described central tube (3) upper end is connected with central tube joint (16) by screw thread, described top connection (13) lower shaft is to L shaped gap (17) is arranged down, below curving, gap (17) is the low right high guide ramp (18) in a left side, the outer boss (19) that is evenly equipped with of described central tube joint (16), the following of boss (19) formed to lower inclined plane by 2, boss (19) places in the gap (17), right tilted surface (20) below the boss (19) curves following guide ramp (18) with gap (17) and matches, be filled with sealing ring in the annular groove of central tube joint (16) top and the interior contact surface of top connection (13), described connector has annular stage in (15), secondary annular stage is arranged outward, the outermost stage is enclosed within the upper exterior tube (12), inner step is enclosed within outside the exterior central tube (8), described dummy piston (14) upper surface has the lock dog (21) that places in the gap (17), the right side, lock dog (21) upper end has that the left tilted surface (22) below boss matches draws inclined-plane (27), be enclosed within outside the central tube (3) and and connect by pin (23), on dummy piston (14) lower end central tube (3) wall through hole (24) is arranged, be filled with sealing ring respectively in dummy piston (14) the inside-and-outside ring groove;
Above-mentioned well-flushing mechanism comprises well-flushing piston (25), in the cavity that the upper exterior tube (12) that described well-flushing piston (25) places dummy piston (14) lower end and central tube (3) form, well-flushing piston (25) has annular stage in the lower end, and be enclosed within outside the annular stage of connector (15) second level, on upper exterior tube (12) wall of corresponding connector (15) second level annular stage liquid pass hole (26) is arranged, the annular stage inner face of well-flushing piston (25) is equipped with sealing ring, is filled with sealing ring respectively in the annular groove of well-flushing piston (25) and upper exterior tube (12) and central tube (3) contact surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010174620 CN101852070B (en) | 2010-05-18 | 2010-05-18 | Pressure balancing inclined plane locking-type gradually deblocking packer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010174620 CN101852070B (en) | 2010-05-18 | 2010-05-18 | Pressure balancing inclined plane locking-type gradually deblocking packer |
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| Publication Number | Publication Date |
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| CN101852070A true CN101852070A (en) | 2010-10-06 |
| CN101852070B CN101852070B (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010174620 Active CN101852070B (en) | 2010-05-18 | 2010-05-18 | Pressure balancing inclined plane locking-type gradually deblocking packer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103291240A (en) * | 2013-06-19 | 2013-09-11 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Packer central pipe unscrewing-resistant locking mechanism and packer with mechanism |
| CN103982157A (en) * | 2013-02-07 | 2014-08-13 | 韦特福特/兰姆有限公司 | Hydraulic set packer with piston to annulus communication |
| CN104806194A (en) * | 2015-05-18 | 2015-07-29 | 长春市恒大石油机械有限公司 | Environment-friendly well-washable step-by-step deblocking water injection packer |
| CN104929563A (en) * | 2015-05-27 | 2015-09-23 | 中国石油天然气股份有限公司 | Water injection packer |
| CN104963652A (en) * | 2015-06-30 | 2015-10-07 | 中国石油集团渤海钻探工程有限公司 | Self-sealing compressed packer |
| CN110485926A (en) * | 2019-08-27 | 2019-11-22 | 中国石油大学(北京) | Rail mounted radial well guider layer-changing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103982157A (en) * | 2013-02-07 | 2014-08-13 | 韦特福特/兰姆有限公司 | Hydraulic set packer with piston to annulus communication |
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| CN103291240B (en) * | 2013-06-19 | 2016-03-16 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Packer central tube anti-back button locking mechanism and the packer containing this locking mechanism |
| CN104806194A (en) * | 2015-05-18 | 2015-07-29 | 长春市恒大石油机械有限公司 | Environment-friendly well-washable step-by-step deblocking water injection packer |
| CN104806194B (en) * | 2015-05-18 | 2017-07-18 | 长春市恒大石油机械有限公司 | Environment-friendly type washing well water injection packer with step-by-step deblocking |
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| CN104929563B (en) * | 2015-05-27 | 2017-10-17 | 中国石油天然气股份有限公司 | Water injection packer |
| CN104963652A (en) * | 2015-06-30 | 2015-10-07 | 中国石油集团渤海钻探工程有限公司 | Self-sealing compressed packer |
| CN110485926A (en) * | 2019-08-27 | 2019-11-22 | 中国石油大学(北京) | Rail mounted radial well guider layer-changing device |
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|---|---|
| CN101852070B (en) | 2012-12-19 |
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