CN208870570U - A kind of solvable bridge plug - Google Patents
A kind of solvable bridge plug Download PDFInfo
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- CN208870570U CN208870570U CN201821646710.1U CN201821646710U CN208870570U CN 208870570 U CN208870570 U CN 208870570U CN 201821646710 U CN201821646710 U CN 201821646710U CN 208870570 U CN208870570 U CN 208870570U
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- central tube
- lock ring
- guide shoe
- bridge plug
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- 238000007789 sealing Methods 0.000 claims description 33
- 229920001971 elastomer Polymers 0.000 claims description 22
- 239000002195 soluble material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 241000282342 Martes americana Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a kind of solvable bridge plug, is related to oil exploration technology field, solves common bridge plug in the prior art and is easy the technical issues of causing damage to wellbore casing inner wall in anchoring.The device includes central tube, and the outside of the central tube is successively arranged with lock ring cap, upper lock ring, seal assembly, cone, slips, lower lock ring and guide shoe from top to bottom；Wherein, monodirectional locking structure one is equipped between the upper lock ring and central tube；The lower lock ring is equipped with monodirectional locking structure two between central tube；Monodirectional locking structure three is equipped between the guide shoe and lower lock ring；The locking direction of the monodirectional locking structure one and monodirectional locking structure three is along the axial direction of central tube and far from guide shoe direction, and the locking direction of the monodirectional locking structure two is along the axial direction of central tube and towards guide shoe direction.The utility model is used in oil exploration, not damaged to wellbore casing inner wall in anchoring, and is not needed to bore and be removed, will not also generative center blockage phenomenon.
Description
Technical Field
The utility model belongs to the technical field of the oil exploration technique and specifically relates to a soluble bridging plug is related to.
Background
Along with the continuous deepening of oil exploration and development, unconventional oil and gas reservoirs with low permeability, low porosity and the like are increased continuously, the development requirements cannot be met by a conventional vertical well, and a horizontal well gradually becomes a necessary means for improving the comprehensive benefits of the oil exploration and development. The horizontal well has the advantages of large oil drainage area, high single well yield, large penetration degree, high reserve utilization degree, capability of effectively avoiding obstacles and harsh environment zones and the like, and becomes the focus of attention of people in scientific research and practice of the petroleum industry.
At present, the bridge plug clustering perforation combination-staged fracturing technology is widely used, and has the advantages of one-time pipe column operation, no staged limitation, simple tool pipe column structure, smooth shaft and the like. As one of the important tools for staged fracturing, bridge plugs are increasingly used.
The applicant has found that the prior art has at least the following technical problems:
1. the common bridge plug in the prior art is easy to generate the central pipe blockage phenomenon;
2. in the prior art, the common bridge plug can be conveyed by using a conveying oil pipe after being drilled and removed in the previous production, so that the process is complicated;
3. in the prior art, the slips of a common bridge plug are the slips with teeth or embedded teeth, and the inner wall of a casing pipe is damaged when the slips are anchored.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a soluble bridging plug to solve the ordinary bridging plug that exists among the prior art and cause the technical problem of damage to pit shaft sleeve pipe inner wall easily when the anchor. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a soluble bridge plug, which comprises a central tube, wherein a lock ring cap, an upper lock ring, a sealing component, a cone, a slip, a lower lock ring and a guide shoe are sequentially sleeved on the outer side of the central tube from top to bottom; wherein,
a one-way locking structure I is arranged between the upper locking ring and the central pipe; a second unidirectional locking structure is arranged between each lower locking ring and the central pipe; a unidirectional locking structure III is arranged between the guide shoe and the lower locking ring; the locking directions of the first unidirectional locking structure and the third unidirectional locking structure are both along the axial direction of the central tube and far away from the guide shoe direction, and the locking directions of the second unidirectional locking structure are both along the axial direction of the central tube and towards the guide shoe direction;
the cone is matched with the slips; the cone is movably connected to the central tube;
the central tube, the locking ring cap, the upper locking ring, the sealing assembly, the cone, the slips, the lower locking ring and the guide shoe are all made of soluble materials; and the outer side surface of the slip is coated with a carborundum wear-resistant coating;
when setting is completed, the slips are anchored on the inner wall of the well casing; the sealing assembly clings to the inner wall of the well casing.
Optionally or preferably, the pipe fitting further comprises a lock ring sleeve, wherein the lock ring sleeve is sleeved on the central pipe; the shapes of the upper end and the lower end of the lock ring sleeve are respectively matched with the shapes of the lock ring cap and the sealing component; the inner side of the lock ring sleeve is also provided with an accommodating space matched with the upper lock ring, the upper lock ring is positioned in the accommodating space of the lock ring sleeve, and the lock ring sleeve is sleeved between the upper lock ring and the sealing component.
Alternatively or preferably, the inner diameter of the base pipe is larger than the outer diameter of the tool for other work operations after fracturing.
Optionally or preferably, the sealing assembly comprises a rubber cylinder, an inner back ring and an outer back ring assembly which are sequentially sleeved on the outer side of the central tube from top to bottom; wherein,
the upper end and the lower end of the rubber cylinder are both provided with a recess, and the lock ring sleeve and the inner back ring are respectively provided with a bulge matched with the recess;
the contact surfaces of the outer back ring assembly, the inner back ring and the cone are inclined surfaces; when the outer back ring assembly is pressed by force, the outer back ring assembly can be pressed towards the inner wall of the shaft casing along the radial direction of the central pipe, and the outer back ring assembly can slide towards the inner wall of the shaft casing along the inclined plane.
Optionally or preferably, the outer back ring assembly comprises a first back ring and a second back ring which are symmetrically arranged, and the first back ring is movably connected with the second back ring.
Alternatively or preferably, the first back ring is clamped with the second back ring.
Optionally or preferably, the sealing assembly further comprises a rubber cylinder inner ring sleeved outside the central tube, and the rubber cylinder inner ring is arranged inside the rubber cylinder.
Optionally or preferably, the inner wall of the central tube at the end where the guide shoe is arranged is provided with a plurality of anti-clogging grooves, and the anti-clogging grooves are formed along the length direction of the central tube.
Optionally or preferably, a longitudinal limiting structure is arranged between the slip and the guide shoe.
Optionally or preferably, the longitudinal limiting structure comprises a plurality of limiting protrusions arranged at the lower end part of the slip and a plurality of limiting grooves arranged at the upper end part of the guide shoe, and the limiting protrusions and the limiting grooves are correspondingly arranged and matched.
Based on the technical scheme, the embodiment of the utility model provides a can produce following technological effect at least:
in the process of putting into production and using the soluble bridge plug, the central tube, the lock ring cap, the upper lock ring, the sealing assembly, the cone, the slips, the lower lock ring and the guide shoe are made of soluble materials, so that the central tube, the lock ring cap, the upper lock ring, the sealing assembly, the cone, the slips, the lower lock ring and the guide shoe can be slowly dissolved to form a full drift diameter without drilling; in addition, because the outer side surface of the slip is coated with the carborundum wear-resistant coating, the inner wall of the shaft sleeve is not damaged when the slip is anchored.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of section A of FIG. 1;
FIG. 3 is an enlarged schematic view of section B of FIG. 1;
FIG. 4 is a schematic view of the embodiment of the present invention in use when encountering a large object;
FIG. 5 is an enlarged view of section C of FIG. 4;
FIG. 6 is a schematic view of the connection of the rubber tube with the inner back ring and the lock ring sleeve according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a release mechanism used in use according to an embodiment of the present invention;
FIG. 8 is a schematic view of the embodiment of the present invention installed on a release mechanism;
fig. 9 is a schematic view of the force transmission direction in setting of the embodiment of the present invention;
FIG. 10 is a partial schematic view of the embodiment of the present invention as installed on a release mechanism;
fig. 11 is a schematic structural diagram of a pawl in a release mechanism according to an embodiment of the present invention.
In the figure: 1. a central tube; 2. a lock ring cap; 3. an upper lock ring; 4. a seal assembly; 401. a rubber cylinder; 402. an inner dorsal loop; 403. an outer back ring assembly; 4031. a first back ring; 4032. a second dorsal ring; 404. an inner ring of the rubber cylinder; 5. a cone; 6. slips; 7. a lower lock ring; 8. guiding a shoe; 9. a lock ring sleeve; 10. anti-clogging grooves; 11. a mandrel; 12. a claw; 13. a support ring; 14. a check ring; 15. fishing the cap; 16. an inner connector; 17. an outward pushing cylinder; 18. removing the pins; 19. a larger object; 20. a wellbore casing; 21. recessing; 22. and (4) protruding.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-11:
the utility model provides a soluble bridge plug, which comprises a central tube 1, wherein a lock ring cap 2, an upper lock ring 3, a sealing component 4, a cone 5, a slip 6, a lower lock ring 7 and a guide shoe 8 are sequentially sleeved on the outer side of the central tube 1 from top to bottom; wherein,
a one-way locking structure I is arranged between the upper locking ring 3 and the central tube 1; a one-way locking structure II is arranged between each lower locking ring 7 and the central tube 1; a one-way locking structure III is arranged between the guide shoe 8 and the lower lock ring 7; the locking directions of the first unidirectional locking structure and the third unidirectional locking structure are both along the axial direction of the central tube 1 and far away from the guide shoe 8, and the locking directions of the second unidirectional locking structure are both along the axial direction of the central tube 1 and towards the guide shoe 8;
the cone 5 is matched with the slips 6; the cone 5 is movably connected to the central tube 1;
the central tube 1, the locking ring cap 2, the upper locking ring 3, the sealing component 4, the cone 5, the slips 6, the lower locking ring 7 and the guide shoe 8 are all made of soluble materials; and the outer side surface of the slips 6 is coated with a carborundum wear-resistant coating;
when setting is completed, the slips 6 are anchored to the inner wall of the wellbore casing 20; the seal assembly 4 is positioned against the inside wall of the wellbore casing 20.
Specifically, the one-way locking structure I is a one-way locking thread I which is arranged on the contact surface of the upper lock ring 3 and the central tube 1 and is matched with the contact surface; the locking direction of the one-way locking structure I is along the axial direction of the central tube 1 and away from the guide shoe 8 (namely, the upper locking ring 3 can be prevented from moving along the central tube 1 and away from the guide shoe 8);
the one-way locking structure II is a one-way locking thread II which is arranged on the contact surface of the lower locking ring 7 and the central tube 1 and is matched with the lower locking ring; the locking directions of the second one-way locking structures are both along the axial direction of the central tube 1 and towards the guide shoe 8 (namely, the lower locking ring 7 can be prevented from moving along the central tube 1 towards the guide shoe 8);
the unidirectional locking structure III is a unidirectional locking thread III which is arranged on the contact surface of the guide shoe 8 and the lower lock ring 7 and is matched with each other; the locking direction of the one-way locking structure III is along the axial direction of the central tube 1 and away from the guide shoe 8 (namely, the guide shoe 8 and the lower locking ring 7 can be prevented from moving relatively in the direction away from the guide shoe 8).
Specifically, cone 5 threaded connection is on center tube 1, and 1 piston effect stress of center tube can directly transmit on slips 6 in the fracturing process, reduces seal assembly 4's pressurized load, can improve sealed stability.
In the process of putting into production and using the soluble bridge plug, the central tube 1, the locking ring cap 2, the upper locking ring 3, the sealing component 4, the cone 5, the slips 6, the lower locking ring 7 and the guide shoe 8 are made of soluble materials, and the central tube 1, the locking ring cap 2, the upper locking ring 3, the sealing component 4, the cone 5, the slips 6, the lower locking ring 7 and the guide shoe 8 can be slowly dissolved, so that a full drift diameter can be formed without drilling; in addition, because the outer side surface of the slips 6 is coated with the carborundum wear-resistant coating, the inner wall of the shaft casing 20 is not damaged when the slips are anchored.
As an optional embodiment, the pipe fitting further comprises a lock ring sleeve 9, wherein the lock ring sleeve 9 is sleeved on the central pipe 1; the shapes of the upper end and the lower end of the lock ring sleeve 9 are respectively matched with the shapes of the lock ring cap 2 and the sealing component 4; the inner side of the lock ring sleeve 9 is also provided with an accommodating space matched with the upper lock ring 3, the upper lock ring 3 is positioned in the accommodating space of the lock ring sleeve 9, and the lock ring sleeve 9 is sleeved between the upper lock ring 3 and the sealing component 4; the lock ring sleeve 9 is made of dissoluble materials.
As an alternative embodiment, the inner diameter of the central pipe 1 is larger than the outer diameter of other operation running tools after fracturing; the central tube 1 is not easy to block due to the larger inner drift diameter, so that the central tube 1 is prevented from being blocked; in addition, as the inner drift diameter of the central pipe 1 is larger than the outer diameter of other operation running tools after fracturing, the central pipe can be directly run into a conveying oil pipe for use without drilling during the previous production, so that the production can be implemented without drilling in the previous period, the working procedures are simplified, and the central pipe can also be directly run into a workover tool for workover operation during workover; in addition, in the process of putting into production and using, the central tube 1, the locking ring cap 2, the upper locking ring 3, the sealing assembly 4, the cone 5, the slips 6, the lower locking ring 7 and the guide shoe 8 are all made of soluble materials, so that the central tube 1, the locking ring cap 2, the upper locking ring 3, the sealing assembly 4, the cone 5, the slips 6, the lower locking ring 7 and the guide shoe 8 can be slowly dissolved, a full drift diameter is formed, and drilling is not needed. In addition, since the inner diameter of the base pipe 1 is larger than the outer diameter of other work running tools after fracturing, oil and gas can be produced even if the bridge packings are not dissolved or drilled out.
As an alternative embodiment, the contact surface between the slips 6 and the cone 5 forms an angle D of 4 ° to 10 ° with the axial direction of the base pipe 1, and setting D at an angle of 4 ° to 10 ° increases the positive pressure of the slips 6 against the inner wall of the wellbore casing 20, increases friction, increases anchoring force, and forms an interlock between the slips 6 and the cone 5.
As an alternative embodiment, the sealing assembly 4 comprises a rubber cylinder 401, an inner back ring 402 and an outer back ring assembly 403 which are sleeved on the outer side of the central tube 1 from top to bottom in sequence; wherein,
the upper end and the lower end of the rubber cylinder 401 are both provided with a recess 21, and the lock ring sleeve 9 and the inner back ring 402 are respectively provided with a bulge 22 matched with the recess 21;
the contact surfaces of the outer back ring assembly 403, the inner back ring 402 and the cone 5 are inclined surfaces; when the outer back ring assembly 403 is pressed by force, the outer back ring assembly 403 is pressed toward the inner wall of the wellbore casing 20 along the radial direction of the base pipe 1, and the outer back ring assembly 403 slides along the inclined surface toward the inner wall of the wellbore casing 20.
As an alternative embodiment, the external back ring assembly 403 includes a first back ring 4031 and a second back ring 4032 symmetrically arranged, and the first back ring 4031 and the second back ring 4032 are movably connected.
As an alternative embodiment, the first back ring 4031 is clamped with the second back ring 4032.
Specifically, the first back ring 4031 and the second back ring 4032 are respectively provided with an annular clamping groove and an annular clamping protrusion on the connected end surfaces; the annular clamping groove is matched with the annular clamping bulge; the clamping protrusions on the second back ring 4032 are clamped in the clamping grooves of the first back ring 4031.
During setting, the outer back ring assembly 403 will be pressed towards the inner wall of the wellbore casing 20 along the radial direction of the central pipe 1 until being tightly attached to the inner wall of the wellbore casing 20, which can effectively prevent the rubber cylinder 401 and the inner back ring 402 from being extruded downwards.
As an alternative embodiment, the sealing assembly 4 further includes a rubber sleeve inner ring 403 sleeved outside the central tube 1, and the rubber sleeve inner ring 403 is arranged inside the rubber sleeve 401.
As an alternative embodiment, the central tube 1 is provided with a plurality of anti-clogging grooves 10 on an inner wall of one end of the guide shoe 8, and the anti-clogging grooves 10 are formed along the length direction of the central tube 1. The anti-blocking groove 10 at the lower end of the central tube 1 is arranged in the guide shoe 8 before setting, after setting, the guide shoe 8 moves upwards, the anti-blocking groove 10 at the lower end of the central tube 1 is exposed, the anti-blocking groove 10 can provide a large flow passage when the lower end of the bridge plug is blocked by a large object 19, fluid can flow into the central tube 1 from the anti-blocking groove 10 in the direction of arrow a in fig. 5, and the channel of the central tube 1 is prevented from being blocked in the backflow process.
Specifically, the inner diameter of the central tube 1 is ensured to be larger than the outer diameter of a tool for other operations after fracturing; correspondingly, the sizes of the locking ring cap 2, the upper locking ring 3, the sealing assembly 4, the cone 5, the slips 6, the lower locking ring 7, the guide shoe 8 and the locking ring sleeve 9 which are arranged outside the central pipe 1 are designed according to the size of the central pipe 1 and the size of the shaft casing 20 (on the premise that the inner diameter of the central pipe 1 needs to be ensured to be larger than the outer diameter of other operation running tools after fracturing, the inner diameter of the central pipe 1 is increased, and the sizes of the locking ring cap 2, the upper locking ring 3, the sealing assembly 4, the cone 5, the slips 6, the lower locking ring 7, the guide shoe 8 and the locking ring sleeve 9 are relatively thinner than those of the locking ring cap 2, the upper locking ring 3, the sealing assembly 4, the cone 5, the slips 6, the lower locking ring 7, the guide shoe 8 and the locking ring sleeve 9 in the prior art); such as: the model of the well casing is 5-1/2 ' 26.8 ', and the inner diameter of the central pipe of the applicable soluble bridge plug is 2.125 '; moreover, the designed anti-blocking groove 10 can also play a role in preventing the central tube 1 from being blocked, so that the effect of preventing the central tube 1 from being blocked can be further enhanced.
As an alternative embodiment, a longitudinal limiting structure is arranged between the slip 6 and the guide shoe 8. The longitudinal limiting structure can prevent the slips 6 and the guide shoe 8 from transmitting relative movement in the setting process of the bridge plug, and the stability of the setting process can be ensured.
As an optional embodiment, the longitudinal limiting structure comprises a plurality of limiting protrusions 22 arranged at the lower end part of the slip 6 and a plurality of limiting grooves arranged at the upper end part of the guide shoe 8, and the limiting protrusions 22 and the limiting grooves are correspondingly arranged and matched.
In this embodiment, the central tube 1, the locking ring cap 2, the upper locking ring 3, the cone 5, the slip 6, the lower locking ring 7, the guide shoe 8 and the locking ring sleeve 9 are all made of a soluble magnesium alloy material sold by marten technologies ltd, which has a corrosion rate of 0.06-0.5 mm/h at a medium temperature of 60-120 ℃, and specific performance parameters are shown in table 1 below; of course, the soluble magnesium alloy material may be produced by other manufacturers as long as the performance parameters of table 1 below are satisfied. The sealing assembly 4 is made of soluble polyurethane rubber, and the polyurethane rubber contains a large amount of molecules which are sensitive to water and can be hydrolyzed into molecules with small molecular weight. Macroscopically, the rubber cylinder is swollen earlier, the elasticity is reduced, and then the rubber cylinder is loosely degraded into tiny particles.
TABLE 1 soluble magnesium alloy material performance parameter table
| Performance items | Detection method and standard | Standard value |
| Density of | 1.8-2.0g/cm3 | |
| Compressive strength | GB/T 7314-2005 | ≥400MPa |
| Tensile strength | GB/T 228.1-2010 | ≥280MPa |
| Permanent set in tension | GB/T 228.1-2010 | ≥3％ |
| Tensile yield strength | GB/T 228.1-2010 | ≥220MPa |
| Hardness HB | GB/T 231.1-2009 | ≥90 |
When the soluble bridge plug of the present invention is set, it is put into the shaft casing 20 through the releasing mechanism, which includes the mandrel 11, the claw 12, the supporting ring 13, the retaining ring 14, the fishing cap 15, the inner connector 16, the outer pushing cylinder 17 and the releasing pin 18, since the releasing mechanism is the prior art, it will not be described in detail here, as shown in fig. 6.
In this embodiment, be equipped with on the inner wall of guide 8 and be connected the dent with the release mechanism cooperation release, will the utility model provides a soluble bridging plug connects when releasing the mechanism on, is to connect guide 8 on the jack catch 12 of release mechanism, and guide 8 is connected the dent through the release connection with jack catch 12. In the process of setting, the soluble bridge plug of the utility model has the following advantages:
a. in-process at the setting, the utility model discloses the upper and lower end synchronous compression of well soluble bridging plug, seal assembly 4 seals and goes on simultaneously with 6 anchoring of slips, and each other does not influence.
b. Because the guide shoe 8 is connected with the release mechanism through the claw 12, in the process of running into the well casing 20, the impact force borne by the guide shoe 8 can be transmitted to the mandrel 11 through the claw 12, the mandrel 11 is directly transmitted to the setting tool, the slips 6 or other tool components can be prevented from being impacted in the process of running into the well casing 20, and the force transmission direction is in the direction b indicated by an arrow in the following figure 8:
C. the hand-free pin 18 has no residue in the well: the length B of the polished rod after the releasing pin 18 is sheared is larger than the gap A between the clamping jaw 12 and the mandrel 11, the slotting width C of the slip 6 is smaller than the diameter of the polished rod of the releasing pin 18, the releasing pin 18 is still remained in the pin hole on the mandrel 11 after being sheared and is lifted along with a releasing tool, and the releasing pin 18 has no residue in the underground
The utility model provides a soluble bridge plug's working process does:
(1) the soluble bridge plug of the utility model is firstly arranged on a releasing mechanism, then is connected with gunpowder or a hydraulic setting tool, and is conveyed to the appointed position of the shaft sleeve 20 by a cable or a continuous oil pipe;
(2) the setting tool is started through gunpowder explosion or other modes, the pressure of the setting tool acts on the locking ring cap 2, the locking ring cap 2 pushes the upper locking ring 3 and the locking ring sleeve 9 to move downwards to compress the sealing component 4, and the outer back ring assembly 403 is opened;
(3) at the same time, the pressure of the setting tool acts on the guide shoe 8 from bottom to top through the internal release mechanism, the guide shoe 8 pushes the lower lock ring 7 and the slips 6 to move upwards, and when the pressure reaches a certain value, the slips 6 are broken;
(4) when the pressure reaches the shearing value of the releasing pin 18, the releasing pin 18 is sheared, the sealing component 4 reaches the maximum compression amount, the outer back ring assembly 403 is expanded to be tightly attached to the inner wall of the casing, and the rubber cylinder 401 and the inner back ring 402 can be effectively prevented from being extruded downwards; slips 6 are anchored on the inner wall of the casing, the upper ring 3 and the lower part of the casing are locked with the central pipe 1, and setting is completed.
(5) And lifting the cable to drive the perforating gun to move, igniting and perforating after the cable reaches a designated position, lifting the perforating gun, a setting tool and other tools after perforating is finished, throwing balls, performing fracturing construction, closing the well after fracturing is finished, and naturally dissolving the soluble bridge plug in the well.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A soluble bridge plug, comprising: the sealing device comprises a central tube, wherein a locking ring cap, an upper locking ring, a sealing assembly, a cone, a slip, a lower locking ring and a guide shoe are sequentially sleeved on the outer side of the central tube from top to bottom; wherein,
a one-way locking structure I is arranged between the upper locking ring and the central pipe; a second unidirectional locking structure is arranged between each lower locking ring and the central pipe; a unidirectional locking structure III is arranged between the guide shoe and the lower locking ring; the locking directions of the first unidirectional locking structure and the third unidirectional locking structure are both along the axial direction of the central tube and far away from the guide shoe direction, and the locking directions of the second unidirectional locking structure are both along the axial direction of the central tube and towards the guide shoe direction;
the cone is matched with the slips; the cone is movably connected to the central tube;
the central tube, the locking ring cap, the upper locking ring, the sealing assembly, the cone, the slips, the lower locking ring and the guide shoe are all made of soluble materials; and the outer side surface of the slip is coated with a carborundum wear-resistant coating;
when setting is completed, the slips are anchored on the inner wall of the well casing; the sealing assembly clings to the inner wall of the well casing.
2. The soluble bridge plug according to claim 1, wherein: the lock ring sleeve is sleeved on the central pipe; the shapes of the upper end and the lower end of the lock ring sleeve are respectively matched with the shapes of the lock ring cap and the sealing component; the inner side of the lock ring sleeve is also provided with an accommodating space matched with the upper lock ring, the upper lock ring is positioned in the accommodating space of the lock ring sleeve, and the lock ring sleeve is sleeved between the upper lock ring and the sealing component.
3. The soluble bridge plug according to claim 1, wherein: the inner drift diameter of the central pipe is larger than the outer diameter of a running tool for other operations after fracturing.
4. The soluble bridge plug of claim 2, wherein: the sealing assembly comprises a rubber cylinder, an inner back ring and an outer back ring assembly which are sequentially sleeved on the outer side of the central tube from top to bottom; wherein,
the upper end and the lower end of the rubber cylinder are both provided with a recess, and the lock ring sleeve and the inner back ring are respectively provided with a bulge matched with the recess;
the contact surfaces of the outer back ring assembly, the inner back ring and the cone are inclined surfaces; when the outer back ring assembly is pressed by force, the outer back ring assembly can be pressed towards the inner wall of the shaft casing along the radial direction of the central pipe, and the outer back ring assembly can slide towards the inner wall of the shaft casing along the inclined plane.
5. The soluble bridge plug of claim 4, wherein: the outer back ring assembly comprises a first back ring and a second back ring which are symmetrically arranged, and the first back ring is movably connected with the second back ring.
6. The soluble bridge plug according to claim 5, wherein: the first back ring is clamped with the second back ring.
7. The soluble bridge plug according to claim 6, wherein: the sealing assembly further comprises a rubber cylinder inner ring sleeved on the outer side of the central tube, and the rubber cylinder inner ring is arranged on the inner side of the rubber cylinder.
8. A soluble bridge plug according to any one of claims 1 to 7, wherein: the inner wall of the central tube at one end provided with the guide shoes is provided with a plurality of anti-blocking grooves, and the anti-blocking grooves are formed along the length direction of the central tube.
9. The soluble bridge plug of claim 8, wherein: and a longitudinal limiting structure is arranged between the slips and the guide shoe.
10. The soluble bridge plug of claim 9, wherein: the longitudinal limiting structure comprises a plurality of limiting protrusions arranged at the end part of the lower end of the slip and a plurality of limiting grooves arranged at the end part of the upper end of the guide shoe, and the limiting protrusions and the limiting grooves are correspondingly arranged and matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821646710.1U CN208870570U (en) | 2018-10-11 | 2018-10-11 | A kind of solvable bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109025898A (en) * | 2018-10-11 | 2018-12-18 | 天津市玛特瑞科技有限公司 | A kind of solvable bridge plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109025898A (en) * | 2018-10-11 | 2018-12-18 | 天津市玛特瑞科技有限公司 | A kind of solvable bridge plug |
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Effective date of registration: 20190905 Address after: 434000 Yinhu Small and Medium-sized Enterprise City B5, No. 13 Road, Shacheng District, Jingzhou City, Hubei Province Patentee after: Jingzhou Sunrise Energy Technology Co., Ltd. Address before: 300450 Tianjin Binhai New Area Tianjin Free Trade Test Area (CBD) Haijing Beiyuan 19-S9 (Tianjin Hexin Business Secretary Co., Ltd. Trusteeship No. 219) Patentee before: Tianjin Matrix Technology Co., Ltd. |