CN102140900B - Design method of expanding type anti-sticking packer - Google Patents
Design method of expanding type anti-sticking packer Download PDFInfo
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- CN102140900B CN102140900B CN201110127535.1A CN201110127535A CN102140900B CN 102140900 B CN102140900 B CN 102140900B CN 201110127535 A CN201110127535 A CN 201110127535A CN 102140900 B CN102140900 B CN 102140900B
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- packer
- relief hole
- packing element
- pressure relief
- type anti
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Abstract
The invention relates to a design method of an expanding type anti-sticking packer substituting for a lower packer connected with an original construction pipe column, belonging to the field of oil and natural gases. The design method of the expanding type anti-sticking packer is characterized in that a preloaded spring, a pressure relief hole I and a pressure relief hole II are arranged on the lower packer, a rubber drum is clamped on the inner wall of a sleeve to be used as a stress support point of the packer when the packer is not contracted, and a central pipe downwards displaces relative to the shell of the packer so that the pressure relief hole I is communicated with the pressure relief hole II, therefore the pressure difference inside the packer is eliminated; one end of the preloaded spring is pressed below an upper joint, and the other end presses on one end of an upper pressing sleeve in a supporting way; a sleeve of the preloaded spring is positioned on an upper transition sleeve; the pressure relief hole I is arranged on a pipe wall positioned on the upper ends of lower joints; and the lower joints positioned at both sides of the pressure relief hole I are provided with sealing rings II. The invention solves the problems of drill pipe sticking accidents caused in such a way that the lower packer is not unsealed during separate-layer fracturing construction.
Description
Technical field
The invention belongs to petroleum gas field, relate in the middle of a kind of technology for pressing crack construction, the lower packet connecting on operating tool string, particularly a kind of method for designing that substitutes a kind of expanding type anti-clamp packer of the lower packet connecting on original operating tool string.
Background technology
Machinery separate stratum fracfturing construction technology technology, normal three envelopes or the two sealed packer of adopting carries out construction in layer, after construction often because of lower floor's strata pressure of construction strata pressure lower than the upper strata of just having constructed, after construction in the situation that reverse circulation is unimpeded, because lower packet still bears certain pressure reduction, can not deblocking, cause lock of tool drilling.
The on-the-spot normal mode that adopts the anti-liquid level of pumping, reduces pressure reduction between upper and lower two oil-gas Layer of packer, carries out unfreezing, and this mode longevity of service, affects continuous pressing crack construction, has caused the work holdup phenomenon of doing over again, and has also caused huge economic loss.
In addition, because of formation sand production, pumping also may form new sand card.
Summary of the invention
The method for designing that the object of this invention is to provide a kind of expanding type anti-clamp packer, when it solves separate stratum fracfturing construction, lower packet is deblocking not, the lock of tool drilling of formation.
Technical scheme of the present invention is: a kind of method for designing of expanding type anti-clamp packer, it is characterized in that: it gives tight spring, relief hole I and relief hole II by the setting on lower packet, when packer does not shrink, packing element is stuck on internal surface of sleeve pipe, stressed support point as packer, allow central tube downwards do relative displacement with packer shell, relief hole I and relief hole II are communicated with, the pressure reduction of releasing packer inside; One end of described preloading spring is pressed under top connection, and other end top is pressed in one end of gland, and the spring of preloading spring is enclosed within on spacer shell; Described relief hole I is arranged on the tube wall of lower contact upper end, in the lower contact of relief hole I both sides, has sealing ring II, and described relief hole II is arranged on the tube wall of lower rubber cylinder seat lower end.
Described expanding type anti-clamp packer, its top connection lower end internal thread is connected with upper spacer shell upper end, on upper spacer shell, there is sealing ring I, the lower end inwall of upper spacer shell and the screwed connection of central tube upper end, central tube lower end and the inwall screwed connection of lower contact upper end, the outside suit of central tube packing element, packing element two ends are respectively by the inwall screwed connection of packing element top connection and packing element lower contact and upper glue tube base and lower rubber cylinder seat one end, the other end of upper glue tube base and the screwed connection of upper spacer shell outer wall, gland on the top screwed connection of upper glue tube base has; The other end of lower rubber cylinder seat and the outer wall screwed connection of lower contact upper end, inlet opening and filter screen are arranged on the central tube of lower rubber cylinder seat correspondence; One end of preloading spring is pressed under top connection, and other end top is pressed in one end of gland, and the spring of preloading spring is enclosed within on spacer shell; Relief hole I is arranged on the tube wall of lower contact upper end, in the lower contact of relief hole I both sides, has sealing ring II, and relief hole II is arranged on the tube wall of lower rubber cylinder seat lower end.
The aperture of described relief hole I is 16 mm, and the aperture of described relief hole II is 12mm.
Described relief hole I and relief hole II are respectively 1-4, along the even cloth of central tube axial direction.
Described relief hole I and relief hole II are respectively 2.
The invention has the beneficial effects as follows: central tube relatively packer shell carries out the displacement of certain distance; In the lower contact of central tube lower end, be provided with relief hole I, lower rubber cylinder seat lower end is provided with relief hole II; When packer does not shrink, packing element is stuck on internal surface of sleeve pipe, stressed support point as packer, allow central tube downwards and packer shell do certain relative displacement, these two holes are communicated with, just can reach the effect of linking up upper and lower construction layer position pressure, remove the pressure reduction of packer inside, reach deblocking releasing object.
The effect of preloading spring is to allow the packing element of packer can set in normally state.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described, but not as a limitation of the invention:
Fig. 1 is that separate stratum fracfturing construction technique principle figure is pressed in two envelope choosings;
Fig. 2 is the packer of the embodiment of the present invention structural representation when normal condition;
Fig. 3 is the packer of the embodiment of the present invention structural representation when pressure release state;
Fig. 4 is the structural representation that amplify the packer bottom of the embodiment of the present invention.
In figure, 1, oil pipe; 2, upper packer; 3, pilot sandblast; 4, construction layer position II; 5, lower packet; 6, ball-and-seat; 7, construction layer position I; 8, sleeve pipe; 9, top connection; 10, preloading spring; 11, upper spacer shell; 12, upper gland; 13, upper glue tube base; 14, packing element; 15, central tube; 16, lower rubber cylinder seat; 17, inlet opening and filter screen; 18, relief hole I; 19, relief hole II; 20, lower contact; 21, sealing ring I; 22, packing element top connection; 23, packing element lower contact; 24, sealing ring II.
The specific embodiment
The structure not describing in detail in an embodiment, its structure is identical with existing known structure.
A kind of method for designing of expanding type anti-clamp packer, it gives tight spring 10, relief hole I 18 and relief hole II 19 by the setting on lower packet 5, when packer does not shrink, packing element 14 is stuck on sleeve pipe 8 inwalls, stressed support point as packer, allow central tube 15 do relative displacement with packer shell downwards, relief hole I 18 and relief hole II 19 are communicated with, the pressure reduction of releasing packer inside; One end of described preloading spring 10 is pressed in top connection 9 times, and other end top is pressed in one end of gland 12, and the spring of preloading spring 10 is enclosed within on spacer shell 11; Described relief hole I 18 is arranged on the tube wall of lower contact 20 upper ends, in the lower contact 20 of relief hole I 18 both sides, has sealing ring II 24, and described relief hole II 19 is arranged on lower rubber cylinder seat 16 lower end tube walls.
Embodiment 2
As shown in Figure 2 and Figure 4, described expanding type anti-clamp packer, its top connection 9 lower end internal threads are connected with upper spacer shell 11 upper ends, on upper spacer shell 11, have sealing ring I 21, with the screw thread thorn sealing on upper glue tube base 13, leak; The lower end inwall of upper spacer shell 11 and central tube 15 upper end screwed connections, central tube 15 lower ends and lower contact 20 upper end inwall screwed connections, the outside suit packing element 14 of central tube 15, packing element 14 two ends are respectively by the inwall screwed connection of packing element top connection 22 and packing element lower contact 23 and upper glue tube base 13 and lower rubber cylinder seat 16 one end, the other end of upper glue tube base 13 and the 11 outer wall screwed connections of upper spacer shell, gland 12 on upper glue tube base 13 top screwed connections have; The other end of lower rubber cylinder seat 16 and lower contact 20 upper end outer wall screwed connections, inlet opening and filter screen 17 are arranged on the central tube 15 of lower rubber cylinder seat 16 correspondences; One end of preloading spring 10 is pressed in top connection 9 times, and other end top is pressed in one end of gland 12, and the spring of preloading spring 10 is enclosed within on spacer shell 11, by preloading spring 10, upper gland 12 and upper spacer shell 11 is held out against, and plays pretension effect; Relief hole I 18 is arranged on the tube wall of lower contact 20 upper ends, in the lower contact 20 of relief hole I 18 both sides, has sealing ring II 24, and relief hole II 19 is arranged on lower rubber cylinder seat 16 lower end tube walls; Wherein, in packing element top connection 22, all adopt sulfuration process with packing element lower contact 23 and packing element 14, sulfuration is integrated, and forms the overall part of shell of packer.
The aperture of described relief hole I 18 is 16 mm, and the aperture of described relief hole II 19 is 12 mm; Described relief hole I 18 and relief hole II 19 are respectively 2 (for optimum value), along the even cloth of central tube axial direction.
During conventional construction (as shown in Figure 2), relief hole I 18 does not communicate with relief hole II 19, can normal construction, but when there is lower packet deblocking form bit freezing (as shown in Figure 3), under the effect of packer internal pressure, packing element 14 is together with being stuck between sleeve pipe 8, can not in cover, move up and down, take packer shell as fulcrum, utilize the weight of former operating tool string, transfer operating tool string, the weight of operating tool string is added on the lower packet central tube 15 of deblocking not, make packer central tube 15 and packing element 14 produce relative displacement, and then the relief hole I 18 in lower contact is communicated with the relief hole II 19 on lower rubber cylinder seat 16, just can reach levels pressure is linked up mutually, play the upper and lower pressure reduction of packer, dwindle gradually, reach the object of deblocking.
The relief hole I of expanding type anti-clamp packer of the present invention and the preferred number of relief hole II are 1-4.
1, separate stratum fracfturing construction technology is pressed in two envelope choosings
As shown in Figure 1, during construction, first to carry out perforation to construction layer position II 4 and the construction layer position I 7 of construction, then upper packer 2, pressure-guiding sand blower 3, lower packet 5 and ball-and-seat 6 are serially connected on oil pipe 1 successively to G.I.H oil reservoir position as shown in Figure 1; Allow two packers block construction layer position I 7 and carry out fracturing construction.
Construction finish after, then on carry drilling tool, allow two packers block construction layer position II 4 and carry out fracturing construction, reach the requirement of construction in layer.
2, by a kind of method for designing of expanding type anti-clamp packer, replace the lower packet in former tubing string
The method for designing of a kind of expanding type anti-clamp packer of the present invention is exactly in order to replace the lower packet 5 in tubular column structure as shown in Figure 1, to solve the not problem of deblocking of rear lower packet of pressing.Two envelopes that a kind of method for designing of expanding type anti-clamp packer is connected to as shown in Figure 1 select the structural tube of compression technology principle to alter, and replace lower packet 5, and G.I.H carries out separate stratum fracfturing construction.
3, operation using method
1) after I construction in construction layer position finishes, the sand that recoils, goes out remaining sand in well, and upper lifting pipe is altered the construction of carrying out construction layer position II.
2) after construction layer position II construction, adopt to control to bleed off pressure, after anti-circulating process, if operating tool string hair fastener is carried in the safe weight range of tubing string motionlessly, explanation is lower packet bit freezing.
3) under regular situation, adopt pumping to fall the mode of liquid level, the pressure differential of dwindling upper and lower two layer positions, reaches the be honored as a queen technological requirement of unfreezing of solution.This method time is oversize, has influence on the continuity of separate stratum fracfturing, and construction cost increases.
4) adopt after the method for designing of this kind of expanding type anti-clamp packer, as long as utilize the weight of tubing string, transfer the certain distance of tubing string, the relief hole on packer central tube is communicated with the relief hole on packer shell, just can reach the requirement of removing seal for packer and unfreezing.
5) in the time of can not deblocking in 10 minutes, can relatively extend its deblocking time to 1 hour, in the time of will reaching balance by several relief holes because of the pressure of upper and lower two oil reservoirs, need the regular hour.
Claims (1)
1. an expanding type anti-clamp packer, it is characterized in that: it is by preloading spring (10), relief hole I (18) and relief hole II (19) in the upper setting of lower packet (5), when packer does not shrink, packing element (14) is stuck on sleeve pipe (8) inwall, stressed support point as packer, allow central tube (15) downwards do relative displacement with packer shell, make relief hole I (18) and relief hole II (19) connection, the pressure reduction of releasing packer inside, one end of described preloading spring (10) is pressed under top connection (9), and other end top is pressed in one end of gland (12), and the spring of preloading spring (10) is enclosed within on spacer shell (11), described relief hole I (18) is arranged on the tube wall of lower contact (20) upper end, in the lower contact (20) of relief hole I (18) both sides, has sealing ring II (24), and described relief hole II (19) is arranged on the tube wall of lower rubber cylinder seat (16) lower end, the top connection of described expanding type anti-clamp packer (9) lower end internal thread is connected with upper spacer shell (11) upper end, on upper spacer shell (11), there is sealing ring I (21), the lower end inwall of upper spacer shell (11) and central tube (15) upper end screwed connection, central tube (15) lower end and lower contact (20) upper end inwall screwed connection, the outside suit of central tube (15) packing element (14), packing element (14) two ends are respectively by the inwall screwed connection of packing element top connection (22) and packing element lower contact (23) and upper glue tube base (13) and lower rubber cylinder seat (16) one end, the other end of upper glue tube base (13) and upper spacer shell (11) outer wall screwed connection, in upper glue tube base (13) top screwed connection, there is upper gland (12), the other end of lower rubber cylinder seat (16) and lower contact (20) upper end outer wall screwed connection, inlet opening and filter screen (17) are arranged on the central tube (15) that lower rubber cylinder seat (16) is corresponding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110127535.1A CN102140900B (en) | 2011-05-17 | 2011-05-17 | Design method of expanding type anti-sticking packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110127535.1A CN102140900B (en) | 2011-05-17 | 2011-05-17 | Design method of expanding type anti-sticking packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102140900A CN102140900A (en) | 2011-08-03 |
| CN102140900B true CN102140900B (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110127535.1A Expired - Fee Related CN102140900B (en) | 2011-05-17 | 2011-05-17 | Design method of expanding type anti-sticking packer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213891B (en) * | 2013-06-05 | 2017-11-07 | 中国石油天然气股份有限公司 | Old well repeats transformation coiled tubing controllable confining process pipe string |
| CN110359894B (en) * | 2019-06-26 | 2021-09-21 | 天地科技股份有限公司 | Hydraulic fracturing pressure relief method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622522A2 (en) * | 1993-04-27 | 1994-11-02 | Ctc International Corporation | Hydraulic port collar |
| CN2360595Y (en) * | 1998-12-17 | 2000-01-26 | 中原石油勘探局采油工艺技术研究所 | Stratified extruding clogging tube pole |
| CN2675853Y (en) * | 2004-02-02 | 2005-02-02 | 中国石油化工股份有限公司中原油田分公司采油工程技术研究院 | Integrated two-stage packer |
| CN202073528U (en) * | 2011-05-17 | 2011-12-14 | 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 | Expanding type anti-clamp packer |
-
2011
- 2011-05-17 CN CN201110127535.1A patent/CN102140900B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622522A2 (en) * | 1993-04-27 | 1994-11-02 | Ctc International Corporation | Hydraulic port collar |
| CN2360595Y (en) * | 1998-12-17 | 2000-01-26 | 中原石油勘探局采油工艺技术研究所 | Stratified extruding clogging tube pole |
| CN2675853Y (en) * | 2004-02-02 | 2005-02-02 | 中国石油化工股份有限公司中原油田分公司采油工程技术研究院 | Integrated two-stage packer |
| CN202073528U (en) * | 2011-05-17 | 2011-12-14 | 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 | Expanding type anti-clamp packer |
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| CN102140900A (en) | 2011-08-03 |
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Granted publication date: 20140212 Termination date: 20210517 |