CN114645688B - Packer while drilling for sealing and isolating high-pressure stratum overflow in well - Google Patents
Packer while drilling for sealing and isolating high-pressure stratum overflow in well Download PDFInfo
- Publication number
- CN114645688B CN114645688B CN202011491095.3A CN202011491095A CN114645688B CN 114645688 B CN114645688 B CN 114645688B CN 202011491095 A CN202011491095 A CN 202011491095A CN 114645688 B CN114645688 B CN 114645688B
- Authority
- CN
- China
- Prior art keywords
- packer
- rubber
- sleeve
- central tube
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 238000007789 sealing Methods 0.000 title claims abstract description 19
- 238000012856 packing Methods 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 210000002445 nipple Anatomy 0.000 claims abstract description 18
- 230000003044 adaptive effect Effects 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000002147 killing effect Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002113 nanodiamond Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Pipe Accessories (AREA)
Abstract
The invention provides a packer while drilling for sealing off high pressure stratum overflow in a well, which comprises the following components: the central tube is provided with a liquid inlet hole and a pressure relief hole; a packer rubber sleeve sleeved on the central pipe; the liquid inlet mechanism comprises a one-way valve assembly, and when the well bore is pressurized to a preset value, the liquid inlet mechanism can enable fluid in the central tube to enter a gap between the packer rubber and the central tube in a one-way mode, so that the packer rubber is inflated to form a packing; the pressure release mechanism comprises a setting and deblocking pup joint which is connected with the packer rubber, and the pressure release hole can be moved upwards by lifting the central tube, so that the internal flow passage of the central tube is communicated with the gap between the packer rubber and the central tube to finish deblocking; the packer comprises a central pipe, a connecting sleeve, a plurality of axially extending guide grooves, a plurality of seat-type unsealing nipple, a plurality of anti-rotation keys and a packer rubber barrel, wherein the plurality of axially extending guide grooves are formed in the outer wall of the central pipe, the connecting sleeve is connected with the guide grooves in an adaptive mode through the guide shear pins, the plurality of axially extending key grooves are formed in the outer wall of the central pipe, and the seat-type unsealing nipple is connected with the key grooves in an adaptive mode through the anti-rotation keys, so that the packer rubber barrel can rotate along with the central pipe.
Description
Technical Field
The invention belongs to the technical field of drilling of oil and gas fields, and particularly relates to a packer while drilling for sealing and isolating underground stratum overflow.
Background
At present, in the drilling operation process of an oil-gas field, after underground overflow occurs, a conventional treatment method is to shut in a well through a wellhead blowout preventer to prevent blowout, and then to kill the well. However, after the well is closed, a large amount of high-pressure gas invades into the well bore to increase the casing pressure and increase the pressure at the well mouth, so that the well-killing difficulty is increased, the well-killing period is prolonged, the subsequent well-killing operation is not facilitated, the blowout prevention effect of the blowout preventer is poor, and the underground high-pressure overflow cannot be effectively sealed.
It is therefore desirable to provide a downhole packer while drilling that is capable of isolating high pressure flooding at a location below the packer to reduce wellhead pressure, thereby providing favorable conditions for subsequent well killing operations.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the packer while drilling for sealing and isolating the overflow of the underground high-pressure stratum, which isolates the high-pressure overflow at a position below the packer so as to reduce wellhead pressure, thereby providing favorable conditions for subsequent well killing operation and enabling a packer rubber to rotate along with a central pipe to realize the function while drilling.
To this end, according to the present invention there is provided a packer while drilling for sealing off high pressure formation overflows downhole, comprising: the hollow tubular central tube, the side wall area of the central tube near both ends has liquid inlet and pressure relief hole separately; a packer rubber sleeve sleeved on the central pipe; the liquid inlet mechanism is arranged at the upper end of the packer rubber, and comprises a one-way valve assembly, wherein the upper end of the one-way valve assembly is connected with the central tube through a connecting sleeve, the lower end of the one-way valve assembly is connected with the packer rubber through an upper supporting sleeve, and the liquid inlet mechanism is configured to enable fluid in the central tube to pass through the liquid inlet hole when a shaft is suppressed to a preset value and enter a gap between the packer rubber and the central tube in a one-way under the action of the one-way valve assembly, so that the packer rubber is radially expanded to seal; the pressure release mechanism is arranged at the lower end of the packer rubber cylinder and comprises a setting and deblocking nipple sleeved on the central pipe, the setting and deblocking nipple is connected with the packer rubber cylinder through a lower supporting sleeve, the pressure release hole can be moved upwards by lifting the central pipe, and an inner runner of the central pipe is communicated with a radial gap between the packer rubber cylinder and the central pipe, so that deblocking is completed; the packer comprises a central tube, a connecting sleeve, a plurality of guide grooves, a plurality of setting and deblocking pup joints, a plurality of guide pins, a plurality of key grooves, a plurality of setting and deblocking pup joints and a packer rubber barrel, wherein the plurality of guide grooves extending along the axial direction are formed in the outer wall of the central tube, the connecting sleeve is connected with the guide grooves in an adaptive mode through guide shear pins, the plurality of key grooves extending along the axial direction are formed in the outer wall of the central tube, and the setting and deblocking pup joints are connected with the key grooves in an adaptive mode through anti-rotation keys, so that the packer rubber barrel can rotate along with the central tube.
In one embodiment, the check valve assembly comprises a check valve housing, a check valve body and an end sleeve fixedly connected with the connecting sleeve, wherein an upward-facing shoulder is arranged on the inner wall of the check valve housing, so that an annular space is formed between the shoulder and the axial direction of the connecting sleeve, the check valve body and the end sleeve are installed in the annular space, the lower end face of the end sleeve abuts against the shoulder, the check valve body is fixedly connected with the end sleeve through a setting shear pin, a gap channel for communicating the liquid inlet hole with the annular space is formed between the connecting sleeve and the central tube, the check valve body is configured to seal the gap channel in an initial state, and the setting shear pin is sheared and descends to open the gap channel when the well bore is pressed down to reach a preset value.
In one embodiment, the check valve assembly further comprises a spring sleeved on the central tube, two ends of the spring respectively abut against the lower end face of the check valve body and the shoulder, and the spring can rebound to enable the check valve body to reseal the gap channel, so that fluid can only flow from the liquid inlet hole to the annular space.
In one embodiment, the part of the connecting sleeve extending into the annular space is provided with a through hole penetrating through the side wall, and the through hole is communicated with the gap channel and the annular space when the check valve body descends to the lower end of the through hole.
In one embodiment, the packer rubber comprises an inner rubber, an outer rubber and an elastic framework arranged between the inner rubber and the outer rubber, wherein the upper end of the outer rubber is fixedly connected with the upper support sleeve through a shoulder pad, and the lower end of the outer rubber is fixedly connected with the lower support sleeve.
In one embodiment, the length of the inner rubber cylinder is greater than that of the elastic framework, so that axially outward extending parts are formed at two ends of the inner rubber cylinder respectively, an upper supporting ring and a lower supporting ring are arranged at two ends of the packer rubber cylinder respectively, and the extending parts at two ends of the inner rubber cylinder respectively form compression fit with the upper supporting sleeve and the lower supporting sleeve through the upper supporting ring and the lower supporting ring.
In one embodiment, the check valve housing and the upper support ring are in clearance fit with the center tube, thereby forming a clearance flow passage which communicates the annular space and the clearance between the packer rubber and the center tube,
And the fluid in the central tube enters the annular space through the one-way valve assembly, and then enters a gap between the packer rubber and the central tube through the gap runner, so that the packer rubber is radially expanded to finish setting.
In one embodiment, the elastic framework, the inner rubber cylinder and the outer rubber cylinder are integrally formed in a vulcanization mode.
In one embodiment, the outer surface of the outer packing element is provided with a wear resistant coating.
In one embodiment, the connecting sleeve is fixedly connected with the outer wall of the central tube through a deblocking shear pin, and during deblocking, the deblocking shear pin is sheared by lifting the central tube, and the pressure release hole on the central tube is moved up to a gap between the packer rubber and the central tube to release pressure, so that deblocking is completed.
Compared with the prior art, the application has the advantages that:
The packer while drilling for sealing off the high-pressure stratum overflow in the well can isolate the high-pressure overflow at a position below the packer so as to reduce wellhead pressure, thereby providing favorable conditions for subsequent well killing operation. And, while drilling packer passes through direction shear pin and guide way adaptation to and prevent that the change key is connected with the keyway adaptation, thereby form and prevent changeing the structure, make packer packing element, feed liquor mechanism, and pressure release mechanism can rotate along with the center tube is synchronous, thereby realize while drilling function, this can effectively guarantee the wholeness of while drilling packer, is favorable to reinforcing its packing performance. In addition, the packer while drilling is wear-resistant and erosion-resistant in the drilling process, can adapt to the high-temperature and high-pressure environment in the well, is very favorable for guaranteeing the packing performance of the packer while drilling, and prolongs the service life of the packer while drilling. The packer while drilling is equivalent to moving the wellhead blowout preventer down the well, so that the wellhead operation risk is greatly reduced, and the operation safety performance is remarkably enhanced.
Drawings
The present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a half cross-sectional view of a packer while drilling for sealing off high pressure formation flooding downhole in accordance with the present invention.
FIG. 2 is a cross-sectional view of a fluid intake mechanism in the while-drilling packer of FIG. 1.
FIG. 3 is a half cross-sectional view of a pressure relief mechanism in the while-drilling packer of FIG. 1.
In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In the present application, the end of the packer for sealing off the overflow of the high pressure formation in the well, which is located near the well head when the packer is lowered into the well bore, is defined as the upper end or the like, and the end of the packer, which is located far from the well head, is defined as the lower end or the like.
FIG. 1 is a semi-sectional view of a packer 100 while drilling for sealing off high pressure formation spills downhole in accordance with the present invention. As shown in fig. 1, the packer 100 includes a base pipe 1, which is a hollow tubular structure having an internal flow passage. Threaded joints are respectively arranged at two ends of the central pipe 1 and are used for connecting other downhole tools. The outer wall of the upper end of the central tube 1 is provided with a plurality of steps with the end face facing downwards, preferably two steps, so that a step-shaped joint is formed for connecting other parts. The side wall of the central tube 1 near the upper end is provided with a liquid inlet hole 11 penetrating through the side wall, and the liquid inlet hole 11 is positioned at the inner side of the stepped joint in the axial direction. The side wall of the central tube 1 near the lower end is provided with a pressure relief hole 12 penetrating through the side wall. The function of the inlet opening 11 and the pressure relief opening 12 will be described below.
As shown in fig. 1, the packer while drilling 100 further comprises a packer rubber 2 sleeved on the central pipe 1, a liquid inlet mechanism 3 arranged at the upper end of the packer rubber 2, and a pressure release mechanism 6 arranged at the lower end of the packer rubber 2. The liquid inlet mechanism 3 is configured to enable fluid in an inner flow channel of the central tube 1 to pass through the liquid inlet hole 11 when the well bore is pressurized to a preset value, and enter a gap between the packer rubber 2 and the central tube 1 in a unidirectional way from the central tube 1, so that the packer rubber 2 is radially expanded to seal, and therefore, the annular gap between the drilling tool and the well wall is sealed. When the packing is required to be unpacked, the central tube 1 is lifted up and pressure is released through the pressure release mechanism 6, so that the central tube 1 is lifted up to the pressure release hole 12, the gap between the packer rubber 2 and the central tube 1 corresponds to the pressure release hole, the packer rubber 2 is enabled to be deformed in a restoring mode, and the unpacking is completed.
According to the invention, the packer rubber 2 comprises an inner rubber 21, an outer rubber 22 and an elastic skeleton 23 arranged between the inner rubber 21 and the outer rubber 22. The upper end of the packer rubber 2 is fixedly and hermetically connected with the liquid inlet mechanism 3 through an upper supporting sleeve 5, and the lower end of the packer rubber is fixedly and hermetically connected with the pressure release mechanism 6 through a lower supporting sleeve 7. In one embodiment, the elastic skeleton 23 is a supporting steel plate. In order to avoid extrusion of the packer rubber 2 during inflation setting, a shoulder 24 is provided between the outer rubber 22 and the upper support sleeve 5. The upper end of the shoulder pad 24 is fixedly connected with the upper supporting sleeve 5 through threads, and the lower end part is correspondingly positioned at the radial outer part of the outer rubber cylinder 22 and extends along the axial direction to form wrapped installation on the end part of the outer rubber cylinder 22, so that the outer rubber cylinder 22 can be well supported in the expanding process of the packer rubber cylinder 2, and extrusion of the outer rubber cylinder 22 can be effectively prevented.
An abrasion-resistant coating is provided on the outer surface of the outer barrel 22. In one embodiment, the wear resistant coating may be, for example, an engine protective coating sprayed onto the outer surface of the outer barrel 22, nanodiamond, ceramic, or other wear resistant material. The wear-resistant coating enables the packer rubber 2 to be wear-resistant and erosion-resistant in the drilling process, can adapt to the high-temperature and high-pressure environment in the well, is very beneficial to ensuring the packing performance of the packer 100 while drilling and prolonging the service life of the packer.
According to one embodiment of the present invention, the axial length of the inner packing element 21 is set to be greater than the axial length of the elastic bobbin 23, so that axially outwardly extending portions are formed at both ends of the inner packing element 21, respectively. The two ends of the packer rubber 2 are respectively provided with an upper supporting ring 8 and a lower supporting ring 9, and the extension parts at the two ends of the inner rubber 21 respectively form compression fit with the upper supporting sleeve 5 and the lower supporting sleeve 7 through the corresponding upper supporting rings 8. The inner rubber cylinder 21 can form stable connection through the upper support ring 8 and the lower support ring 9, and the falling off of the two ends of the packer rubber cylinder 2 is effectively avoided.
As shown in fig. 2, the upper support ring 8 is sleeved on the central tube 1, and the outer wall of the lower end of the upper support ring 8 is configured into a conical surface. The lower end of the upper support ring 8 is installed between the extended portion of the upper end of the inner packing element 21 and the radial direction of the center tube 1 by the tapered surface axially downward, so that a radial pressing force is formed on the extended portion of the upper end of the inner packing element 21 by the upper support ring 8. Thereby, the extension of the upper end of the inner rubber 21 is press fitted between the upper support sleeve 5 and the radial direction of the upper support ring 8 by the upper support ring 8. In this embodiment, the upper support ring 8 is in clearance fit with the center tube 1, thereby allowing fluid to flow past, so that fluid entering the fluid intake mechanism 3 can enter the gap between the packer rubber 2 and the center tube 1.
Likewise, as shown in fig. 3, the lower support ring 9 is fitted over the central tube 1, and the upper end outer wall of the lower support ring 9 is constructed as a tapered surface. The upper end of the lower support ring 9 is installed axially upward between the extended portion of the lower end of the inner packing element 21 and the radial direction of the center tube 1 by the tapered surface, so that a radial pressing force is formed on the extended portion of the lower end of the inner packing element 21 by the lower support ring 9. Thereby, the extension of the lower end of the inner rubber 21 is press fitted between the lower support sleeve 7 and the radial direction of the lower support ring 9 by the lower support ring 9. And, a seal is formed between the extended portion of the lower end of the inner packing element 21 and the center pipe 1. In this embodiment, the lower support ring 9 is initially in the upper end position of the pressure relief hole 12. The mode that this kind of through last support ring 8 and lower support ring 9 of packer packing element 2 carries out the installation of compress tightly can effectively avoid the both ends of packer packing element 2 to drop, has effectively guaranteed the installation stability of packer packing element 2, is favorable to very much reinforcing packer packing element 2's packing performance.
As shown in fig. 2, the liquid intake mechanism 3 includes a check valve assembly 30, and the check valve assembly 30 includes a check valve housing 31, a check valve body 32, and an end cap 33. The check valve housing 31 is sleeved on the central tube 1, and the upper end of the check valve housing 31 is fixedly connected with a step-shaped joint of the outer wall of the upper end of the central tube 1 through the connecting sleeve 4. The inner wall of the check valve housing 31 is provided with an upwardly facing shoulder so that an annular space 34 is formed between the shoulder and the axial direction of the nipple 4. The check valve body 32 and the end sleeve 33 are arranged in the annular space 34, the lower end face of the end sleeve 33 abuts against the shoulder, and the check valve body 32 is fixedly connected with the end sleeve 33 through the setting shear pin 35.
The upper end of the connecting sleeve 4 is constructed into a step joint and is used for being connected with the step joint of the outer wall of the upper end of the central tube 1 in an adapting way. And, the upper end of adapter sleeve 4 is through deblocking shear pin 43 and the outer wall fixed connection of center tube 1, during deblocking, cut deblocking shear pin 43 through lifting up center tube 1 to make the pressure release hole 12 on center tube 1 shift up to the clearance between packer packing element 2 and center tube 1 in order to release pressure, thereby accomplish the deblocking.
According to one embodiment of the invention, the inner wall of the upper end portion of the connection sleeve 4 forms a seal with the outer wall of the center tube 1 at the upper end of the inlet opening 11. And a slit passage is formed between the inner wall of the lower end portion of the connection sleeve 4 and the outer wall surface of the center tube 1 corresponding to the inlet port 11, the slit passage communicating the inlet port 11 with the annular space 34. The check valve body 32 is configured to block the slit passage in an initial state, and to shear the setting shear pin 35 and descend to open the slit passage when the wellbore pressure reaches a predetermined value P 1. In one embodiment, a through hole 42 is provided through the side wall at the portion of the connection sleeve 4 extending into the annular space 34. The through hole 42 communicates the slit passage and the annular space when the check valve body 32 descends to the lower end of the through hole 42, thereby opening the slit passage. Thereby, the fluid in the inner flow passage of the center tube 1 is made to pass through the inlet holes 11, the slit passages, the through holes 42 in this order and enter the annular space 34.
In one embodiment, the upper end of the check valve body 32 is provided with rubber, through which the slit passage can be effectively blocked, thereby ensuring the sealing performance of the check valve assembly 3.
The check valve assembly 3 further comprises a spring 36 sleeved on the central tube 1, two ends of the spring 36 respectively abut against the lower end face and the shoulder of the check valve body 32, and the spring 36 can rebound when the fluid pressure in the inner flow passage of the central tube 1 is smaller than the fluid pressure in the annular space 34, so that the check valve body 32 is reset to block the gap passage again, and therefore the fluid in the inner flow passage of the central tube 1 can only flow from the liquid inlet 11 to the annular space 34. Thereby, the function of the check valve assembly 3 is realized that enables only one-way fluid flow.
According to the invention, the check valve housing 31 and the upper support ring 8 are both in clearance fit with the central tube 1, so that a clearance flow passage is formed which communicates the annular space 34 and the clearance between the packer rubber 2 and the central tube 1. The fluid in the central tube 1 enters the annular space 34 through the one-way valve assembly 3 and then enters a gap between the packer rubber 2 and the central tube 1 through a gap runner, so that the packer rubber 2 is radially expanded and setting is completed.
As shown in fig. 3, the pressure release mechanism 6 includes a setting and unsetting nipple 61 that is sleeved on the base pipe 1. The outer wall of the upper end of the setting and deblocking nipple 61 is constructed into a step-shaped joint, the outer wall of the step-shaped joint is provided with threads, and the setting and deblocking nipple 61 is fixedly connected with the lower supporting sleeve 7 through the step-shaped joint. The setting and unsetting nipple 61 is connected with the packer rubber 2 through the lower support sleeve 7. In the initial state, the pressure relief hole 12 is at the lower end position of the lower support ring 9. When the packing is required to be unpacked, the pressure release hole 12 can be moved upwards by lifting the central tube 1, and the inner runner of the central tube 1 is communicated with the radial gap between the packer rubber and the central tube 1, so that the fluid pressure in the radial gap between the packer rubber and the central tube 1 is released, and the unpacking is completed.
In one embodiment, a first end ring 81 is provided between the upper support ring 8 and the axial direction of the check valve housing 31, and a second end ring 91 is provided between the lower support ring 9 and the axial direction of the setting and unseating nipple 61. The first end ring is fitted over the central tube 1 and the first end ring 81 is in a clearance fit with the central tube 1, thereby creating a gap in which the fluid can flow. The upper end face and the lower end face of the first end ring 81 respectively lean against the lower end face of the check valve housing 31 and the upper end face of the upper support ring 8, so that axial limit is formed on the upper support ring 8, and compression installation of the upper end of the packer rubber 2 is effectively ensured. Similarly, the second end ring 91 is also sleeved on the central tube 1, and the upper end face and the lower end face of the second end ring 91 respectively abut against the lower end face of the lower support ring 9 and the upper end face of the setting and unsetting nipple 61, so that axial limit is formed on the lower support ring 9, and compression installation of the lower end of the packer rubber 2 is effectively ensured. Therefore, the two ends of the packer rubber 2 can be effectively prevented from falling off, and the mounting stability of the packer rubber 2 is guaranteed.
According to one embodiment of the invention, a plurality of axially extending guide grooves 13 are provided in the outer wall of the central tube 1 near the upper end, the plurality of guide grooves 13 being evenly distributed in the circumferential direction. The connecting sleeve 4 is connected with the guide groove 13 in a fitting way through the guide shear pin 41, and can transmit torque. Meanwhile, a plurality of axially extending key grooves 14 are formed in the outer wall of the central tube 1 near the lower end, and the plurality of key grooves 14 are uniformly distributed in the circumferential direction. The setting and unsetting nipple 61 is connected with the key groove 14 in an adaptive manner through an anti-rotation key 62, and can transmit torque. Therefore, the guide shear pin 41 is connected with the guide groove 13 in an adaptive manner, and the anti-rotation key 62 is connected with the key groove 14 in an adaptive manner, so that an anti-rotation structure is formed, and the packer rubber 2, the liquid inlet mechanism 3 and the pressure release mechanism 6 can synchronously rotate along with the central tube 1, so that the function while drilling is realized.
To ensure the sealing performance of the while-drilling packer 100, a seal is provided between the connection faces of the interconnected components. For example, a sealing member may be provided between the connecting sleeve 4 and the outer wall surface of the upper end portion of the center tube 1 located in the liquid inlet 11, a sealing member may be provided at the junction between the check valve housing 31 and the connecting sleeve 4 and the upper support sleeve 5, a sealing member may be provided at the junction between the lower support sleeve 7 and the setting and unsetting nipple 61, a sealing member may be provided between the setting and unsetting nipple 61 and the center tube 1, and the like.
During actual operation of the packer while drilling 100 for sealing off high pressure formation spills downhole according to the present invention, the packer while drilling 100 is first connected into a string and lowered into a predetermined formation in a wellbore. When setting is needed, the check valve body 32 is pushed to shear the setting shear pin 35 and move downwards until the wellbore pressure is increased to reach the preset value P 1, so that the gap channel and the through hole 42 are opened, and the fluid in the inner flow channel of the central tube 1 sequentially passes through the liquid inlet hole 11, the gap channel and the through hole 42 and enters the annular space 34. Under the action of the pressure holding, the fluid entering the annular space 34 continues to pass through the clearance flow channel between the check valve shell 31, the upper support ring 8, the first end ring and the central pipe 1 and enters the clearance between the packer rubber 2 and the central pipe 1. Fluid enters a gap between the inner rubber cylinder 21 and the central tube 1 to enable the inner rubber cylinder 21 to be filled with liquid for expansion, the inner rubber cylinder 21 drives the elastic framework 23 and the outer rubber cylinder 22 to be radially expanded at the same time, and the packer rubber cylinder 2 is fully expanded after the pressure in the central tube 1 reaches a set value P 2, so that setting is completed. By moving the packer while drilling 100 in concert with moving the wellhead blowout preventer downhole, this greatly reduces the risk of wellhead operations, significantly enhancing the safety performance of the operations.
According to one embodiment of the invention, a circulation nipple (not shown) is connected to the upper end of the central tube 1, the circulation nipple being provided with a circulation hole communicating the internal flow passage of the central tube 1 with the well bore annulus. When the setting is completed, the pressure is continuously suppressed until the pressure in the central tube 1 reaches P 3, so that the circulating hole in the tube string is opened to communicate the internal pressure and the external pressure of the tube string. At this time, the fluid pressure in the internal flow passage of the center tube 1 is reduced to be balanced with the wellbore pressure and smaller than the fluid pressure in the check valve assembly 30, so that the check valve body 32 is rebound and reset under the action of the spring 36, thereby closing the check valve assembly 30 and keeping the fluid pressure between the packer rubber 2 and the center tube 1 unchanged at P 3. Therefore, after the circulation hole is opened, the packer rubber can be kept in a seat sealing state all the time. This enables circulation of heavy slurry above the packer glue 2, providing an advantage for handling overflows. It is understood that P 1 is less than P 2,P2 and less than P 3 herein.
After the overflow operation is completed, when the deblocking is needed, the central tube 1 is lifted up to shear the deblocking shear pins 43, so that the central tube 1 moves upwards to generate axial relative motion with the pressure release mechanism 6, the packer rubber 2 and the liquid inlet mechanism, thereby enabling the pressure release hole 12 to move upwards, enabling the inner runner of the central tube 1 to release high pressure in the radial gap between the packer rubber 2 and the central tube 1 through the radial gap between the packer rubber 2 and the central tube 1, and the packer rubber 2 recovers to deform under the action of self elasticity and the elastic framework 23, thereby completing deblocking.
The while-drilling packer 100 for packing off high pressure formation spills downhole according to the present invention is capable of isolating high pressure spills below the packer to reduce wellhead pressure, thereby enabling advantageous conditions for subsequent well killing operations. And, while-drilling packer 100 is connected with guide slot 13 adaptation through direction shear pin 41 to and prevent that rotary key 62 is connected with keyway 14 adaptation, thereby form and prevent changeing the structure, make packer packing element 2, feed liquor mechanism 3, and relief mechanism 6 can rotate along with center tube 1 is synchronous, thereby realize while-drilling function, this can effectively guarantee while-drilling packer 100's bulk connectivity, is favorable to reinforcing its packing performance. In addition, the packer 100 is wear-resistant and erosion-resistant in the drilling process, can adapt to the high-temperature and high-pressure environment in the well, is very beneficial to ensuring the packing performance of the packer 100 while drilling and prolonging the service life of the packer.
Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A packer while drilling for sealing off an overflow of a downhole formation, comprising:
A hollow tubular central tube (1), wherein the side wall areas of the central tube, which are close to two ends, are respectively provided with a liquid inlet hole (11) and a pressure relief hole (12);
a packer rubber sleeve (2) sleeved on the central pipe;
the liquid inlet mechanism (3) is arranged at the upper end of the packer rubber, and comprises a one-way valve assembly (30), wherein the upper end of the one-way valve assembly is connected with the central pipe through a connecting sleeve (4), the lower end of the one-way valve assembly is connected with the packer rubber through an upper supporting sleeve (5), and the liquid inlet mechanism is configured to enable fluid in the central pipe to pass through the liquid inlet hole when a shaft is pressed to a preset value and enter a gap between the packer rubber and the central pipe in a one-way under the action of the one-way valve assembly, so that the packer rubber is radially expanded to seal; and
The pressure release mechanism (6) is arranged at the lower end of the packer rubber, and comprises a setting and deblocking nipple (61) sleeved on the central pipe, the setting and deblocking nipple is connected with the packer rubber through a lower supporting sleeve (7), the pressure release hole can be moved upwards by lifting the central pipe, and an inner runner of the central pipe is communicated with a radial gap between the packer rubber and the central pipe, so that deblocking is completed;
The outer wall of the central pipe is provided with a plurality of guide grooves (13) extending along the axial direction, the connecting sleeve is connected with the guide grooves in an adaptive manner through guide shear pins (41), the outer wall of the central pipe is provided with a plurality of key grooves (14) extending along the axial direction, and the setting and deblocking pup joint is connected with the key grooves in an adaptive manner through anti-rotation keys (62), so that the packer rubber can rotate along with the central pipe;
The one-way valve assembly comprises a one-way valve shell (31), a one-way valve body (32) and an end sleeve (33) which are fixedly connected with the connecting sleeve, wherein the inner wall of the one-way valve shell is provided with an upward-facing shoulder, so that an annular space (34) is formed between the shoulder and the axial direction of the connecting sleeve, the one-way valve body and the end sleeve are arranged in the annular space,
The lower end face of the end sleeve abuts against the shoulder, the one-way valve body is fixedly connected with the end sleeve through a setting shear pin (35), a gap channel which is used for communicating the liquid inlet hole with the annular space is formed between the connecting sleeve and the central tube, the one-way valve body is configured to seal the gap channel in an initial state, and cut off the setting shear pin and move downwards to open the gap channel when the well bore is pressurized to reach a preset value,
The check valve assembly further comprises a spring (36) sleeved on the central tube, two ends of the spring respectively lean against the lower end face of the check valve body and the shoulder, and the spring can rebound to enable the check valve body to block the gap channel again, so that fluid can only flow from the liquid inlet hole to the annular space.
2. A packer as claimed in claim 1, wherein the part of the connection sleeve extending into the annular space is provided with a through hole (42) penetrating the side wall, the through hole communicating the slit passage with the annular space when the one-way valve body is lowered to the lower end of the through hole.
3. The packer while drilling according to claim 1, wherein the packer rubber comprises an inner rubber (21), an outer rubber (22) and an elastic framework (23) arranged between the inner rubber and the outer rubber, the upper end of the outer rubber is fixedly connected with the upper support sleeve through a shoulder pad (24), and the lower end of the outer rubber is fixedly connected with the lower support sleeve.
4. A packer as claimed in claim 3, wherein the length of the inner packing element is greater than the length of the elastic framework so that axially outwardly extending portions are formed at both ends, respectively, an upper support ring (8) and a lower support ring (9) are provided at both ends of the packer packing element, respectively, and the extending portions at both ends of the inner packing element form a press fit with the upper and lower support sleeves, respectively, via the upper and lower support rings.
5. The packer while drilling of claim 4, wherein the check valve housing and the upper support ring are each in clearance fit with the center tube to form a clearance flow passage communicating the annular space and a clearance between the packer packing element and the center tube,
And the fluid in the central tube enters the annular space through the one-way valve assembly, and then enters a gap between the packer rubber and the central tube through the gap runner, so that the packer rubber is radially expanded to finish setting.
6. The packer while drilling of claim 3, wherein the elastomeric carcass is integrally formed with the inner and outer packing elements by vulcanization.
7. The packer while drilling of claim 3, wherein an outer surface of the outer packing element is provided with a wear resistant coating.
8. The packer while drilling of claim 5, wherein the connection sleeve is fixedly connected to the outer wall of the center tube by a deblocking shear pin (43), and when deblocking is completed, the deblocking shear pin is sheared by lifting the center tube and the pressure relief hole in the center tube is moved up to a gap between the packer rubber and the center tube to relieve pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491095.3A CN114645688B (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for sealing and isolating high-pressure stratum overflow in well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491095.3A CN114645688B (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for sealing and isolating high-pressure stratum overflow in well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114645688A CN114645688A (en) | 2022-06-21 |
| CN114645688B true CN114645688B (en) | 2024-05-28 |
Family
ID=81990995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011491095.3A Active CN114645688B (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for sealing and isolating high-pressure stratum overflow in well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114645688B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115628021B (en) * | 2022-10-28 | 2024-05-07 | 西南石油大学 | Sand removal tool while drilling bottom |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7314658A (en) * | 1972-10-25 | 1974-04-29 | ||
| CN101812981A (en) * | 2010-04-17 | 2010-08-25 | 西南石油大学 | Mechanical underground all-in-one blowout preventer |
| RU2409736C1 (en) * | 2009-09-21 | 2011-01-20 | Закрытое акционерное общество "Научно-производственное предприятие "СибБурМаш" | Packer |
| CN102071900A (en) * | 2010-11-23 | 2011-05-25 | 中国石油天然气股份有限公司 | Custom-pressure expandable naked eye packer |
| CN102235158A (en) * | 2011-05-26 | 2011-11-09 | 西南石油大学 | Underground annular blowout preventer and assembly process thereof |
| CA2803032A1 (en) * | 2010-06-22 | 2011-12-29 | Inflatable Packers International Pty Ltd | Inflatable packer and control valve |
| CN204024576U (en) * | 2014-08-27 | 2014-12-17 | 中国石油化工股份有限公司 | A kind of packer |
| CN104653145A (en) * | 2013-11-25 | 2015-05-27 | 天津大港油田钻采技术开发公司 | Long-rubber-barrel differential pressure type water filling packer capable of washing well |
| CN104806192A (en) * | 2015-05-08 | 2015-07-29 | 中石化石油工程机械有限公司研究院 | Lifting valve eccentric type downhole blowout preventer |
| CN104968888A (en) * | 2012-12-21 | 2015-10-07 | 资源成套设备公司 | Multi-stage well isolation and fracturing |
| CN105370241A (en) * | 2014-08-29 | 2016-03-02 | 中国石油化工股份有限公司 | Packing device and method during drilling for abandoning well |
| CN206874249U (en) * | 2017-06-05 | 2018-01-12 | 华运隆腾机械制造有限公司 | Fluid power expansion type well packer capable of flushing well |
| CN109098684A (en) * | 2018-11-09 | 2018-12-28 | 铁岭曲氏石油技术开发服务有限公司 | Expanding underseal drag fracturing packer and its construction method |
| CN209145557U (en) * | 2018-11-30 | 2019-07-23 | 齐齐哈尔亚盛机械制造有限公司 | A kind of repeatable long packing element packer set |
| CN110593803A (en) * | 2019-10-17 | 2019-12-20 | 成都理工大学 | Integrated infinite-stage fracturing packer |
| CN110847846A (en) * | 2020-01-15 | 2020-02-28 | 山东博赛特石油技术有限公司 | Well washing protection integrated packer and method |
| CN111075385A (en) * | 2018-10-22 | 2020-04-28 | 中国石油化工股份有限公司 | Single-pipe double-control safe well-flushing packer |
| CN211549659U (en) * | 2019-10-24 | 2020-09-22 | 中国石油化工股份有限公司 | Long-life water injection string of offshore oil field |
| CN111749645A (en) * | 2019-03-28 | 2020-10-09 | 中国石油天然气股份有限公司 | Blanking plug |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI3803032T3 (en) * | 2018-05-30 | 2023-04-27 | Numa Tool Co | Pneumatic drilling with packer slideable along stem drill rod |
-
2020
- 2020-12-17 CN CN202011491095.3A patent/CN114645688B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7314658A (en) * | 1972-10-25 | 1974-04-29 | ||
| RU2409736C1 (en) * | 2009-09-21 | 2011-01-20 | Закрытое акционерное общество "Научно-производственное предприятие "СибБурМаш" | Packer |
| CN101812981A (en) * | 2010-04-17 | 2010-08-25 | 西南石油大学 | Mechanical underground all-in-one blowout preventer |
| CA2803032A1 (en) * | 2010-06-22 | 2011-12-29 | Inflatable Packers International Pty Ltd | Inflatable packer and control valve |
| CN102071900A (en) * | 2010-11-23 | 2011-05-25 | 中国石油天然气股份有限公司 | Custom-pressure expandable naked eye packer |
| CN102235158A (en) * | 2011-05-26 | 2011-11-09 | 西南石油大学 | Underground annular blowout preventer and assembly process thereof |
| CN104968888A (en) * | 2012-12-21 | 2015-10-07 | 资源成套设备公司 | Multi-stage well isolation and fracturing |
| CN104653145A (en) * | 2013-11-25 | 2015-05-27 | 天津大港油田钻采技术开发公司 | Long-rubber-barrel differential pressure type water filling packer capable of washing well |
| CN204024576U (en) * | 2014-08-27 | 2014-12-17 | 中国石油化工股份有限公司 | A kind of packer |
| CN105370241A (en) * | 2014-08-29 | 2016-03-02 | 中国石油化工股份有限公司 | Packing device and method during drilling for abandoning well |
| CN104806192A (en) * | 2015-05-08 | 2015-07-29 | 中石化石油工程机械有限公司研究院 | Lifting valve eccentric type downhole blowout preventer |
| CN206874249U (en) * | 2017-06-05 | 2018-01-12 | 华运隆腾机械制造有限公司 | Fluid power expansion type well packer capable of flushing well |
| CN111075385A (en) * | 2018-10-22 | 2020-04-28 | 中国石油化工股份有限公司 | Single-pipe double-control safe well-flushing packer |
| CN109098684A (en) * | 2018-11-09 | 2018-12-28 | 铁岭曲氏石油技术开发服务有限公司 | Expanding underseal drag fracturing packer and its construction method |
| CN209145557U (en) * | 2018-11-30 | 2019-07-23 | 齐齐哈尔亚盛机械制造有限公司 | A kind of repeatable long packing element packer set |
| CN111749645A (en) * | 2019-03-28 | 2020-10-09 | 中国石油天然气股份有限公司 | Blanking plug |
| CN110593803A (en) * | 2019-10-17 | 2019-12-20 | 成都理工大学 | Integrated infinite-stage fracturing packer |
| CN211549659U (en) * | 2019-10-24 | 2020-09-22 | 中国石油化工股份有限公司 | Long-life water injection string of offshore oil field |
| CN110847846A (en) * | 2020-01-15 | 2020-02-28 | 山东博赛特石油技术有限公司 | Well washing protection integrated packer and method |
Non-Patent Citations (2)
| Title |
|---|
| 扩张式封隔器性能测试装置的设计;谷磊;;机械制造(第07期);第88页-第90页 * |
| 液压压胀式尾管顶部封隔器研制与试验;邵志香;马兰荣;朱和明;谷磊;薛占峰;廖洪千;;石油矿场机械(第06期);第63页-第67页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114645688A (en) | 2022-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2734871C (en) | Annulus isolation valve | |
| CA1187407A (en) | Hydraulic setting tool with flapper valve | |
| US4420159A (en) | Packer valve arrangement | |
| US20030089501A1 (en) | Tubing hanger with annulus bore | |
| CA2105008A1 (en) | Casing hanger seal with test port | |
| AU2010246353A1 (en) | Metal-to-metal seal with wiper element and wellhead system incorporating same | |
| US11391130B2 (en) | Gas-lift system | |
| USRE32345E (en) | Packer valve arrangement | |
| US20180334876A1 (en) | Annular blowout preventer | |
| CN114575773A (en) | Tail pipe suspension device with top packer and tail pipe suspension assembly | |
| CN114645688B (en) | Packer while drilling for sealing and isolating high-pressure stratum overflow in well | |
| CN110439500A (en) | It is a kind of can pressure release self-sealing cup packer and its application method | |
| RU57797U1 (en) | HYDRAULIC PACKER FOR CUP CEMENTING | |
| CN209799937U (en) | Separate-layer water injection device of casing damage repair well | |
| CN208184692U (en) | Deepwater drilling casing head and annular space sealing device tripping in tool | |
| CN211115910U (en) | Three-piston hydraulic balance washable well packer | |
| RU2560035C1 (en) | Bypass valve | |
| CN110905442B (en) | Empty cement paste of sleeve pipe outer loop fills packer | |
| RU128896U1 (en) | DEVICE FOR TRANSFER OF WELLS, INCLUDING WATERFILLED, TO OPERATION ON TWO LIFT COLUMNS | |
| CN114439445B (en) | Sand prevention sliding sleeve | |
| RU2752804C1 (en) | Downhole hydromechanical packer | |
| US4372387A (en) | Downhole tool with ratchet | |
| CN210068068U (en) | Compression packer | |
| US4862960A (en) | Blowout preventer testing apparatus | |
| GB2399361A (en) | Downhole bypass valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |