CN114645688A - Packer while drilling for packing underground high-pressure stratum overflow - Google Patents
Packer while drilling for packing underground high-pressure stratum overflow Download PDFInfo
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- CN114645688A CN114645688A CN202011491095.3A CN202011491095A CN114645688A CN 114645688 A CN114645688 A CN 114645688A CN 202011491095 A CN202011491095 A CN 202011491095A CN 114645688 A CN114645688 A CN 114645688A
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- 238000005553 drilling Methods 0.000 title claims abstract description 52
- 238000012856 packing Methods 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 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 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 11
- 230000006978 adaptation Effects 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
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- 238000004073 vulcanization Methods 0.000 claims description 2
- 230000001012 protector Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 230000002349 favourable effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
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- 230000004323 axial length Effects 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention provides a packer while drilling for isolating downhole high-pressure formation overflow, comprising: the central pipe 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 shaft is suppressed to a preset value, the liquid inlet mechanism enables the fluid in the central pipe to enter a gap between the packer rubber sleeve and the central pipe in a one-way mode so as to enable the packer rubber sleeve to expand to form packing; the pressure relief mechanism comprises a setting and deblocking short joint connected with the packer rubber cylinder, the central pipe is lifted up to enable the pressure relief hole to move upwards, and an internal flow passage of the central pipe is communicated with a gap between the packer rubber cylinder and the central pipe to complete deblocking; wherein, be equipped with a plurality of guide ways along axial extension on the outer wall of center tube, the adapter sleeve passes through direction shear pin and guide way adaptation connection, is equipped with a plurality of keyway along axial extension on the outer wall of center tube, sits and seals the deblocking nipple joint through preventing commentaries on classics key and keyway adaptation connection to make the packer packing element can rotate along with the center tube.
Description
Technical Field
The invention belongs to the technical field of oil and gas field drilling, and particularly relates to a packer while drilling for packing underground stratum overflow.
Background
At present, in the drilling operation process of an oil and gas field, after underground overflow occurs, the conventional treatment method is to close the well through a wellhead blowout preventer to prevent blowout, and then carry out well killing. However, after the well is shut down, a large amount of high-pressure gas is invaded into the shaft to increase the casing pressure and increase the pressure of 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 preventer is poor in blowout prevention effect, and the underground high-pressure overflow cannot be effectively sealed.
It is therefore desirable to provide a downhole while drilling packer that can isolate the high pressure kick below the packer to reduce the wellhead pressure, thereby providing advantages for subsequent kill operations.
Disclosure of Invention
In view of the above technical problems, the present invention is directed to a packer while drilling for isolating high pressure formation overflow in a well, which isolates the high pressure overflow below the packer to reduce the pressure at the well head, thereby providing advantages for subsequent killing operations and enabling a packer rubber cylinder to rotate along with a base pipe to perform a function while drilling.
To this end, according to the invention there is provided a packer while drilling for isolating high pressure formation overflow downhole, comprising: the pressure relief valve comprises a hollow tubular central pipe, wherein the side wall areas of the central pipe close to two ends are respectively provided with a liquid inlet hole and a pressure relief hole; the packer rubber sleeve is sleeved on the central pipe; the liquid inlet mechanism is arranged at the upper end of the packer rubber barrel and comprises a one-way valve assembly, the upper end of the one-way valve assembly is connected with the central pipe through a connecting sleeve, the lower end of the one-way valve assembly is connected with the packer rubber barrel through an upper supporting sleeve, and the liquid inlet mechanism is constructed to enable fluid in the central pipe to pass through the liquid inlet hole and enter a gap between the packer rubber barrel and the central pipe in a single direction under the action of the one-way valve assembly when a shaft is suppressed to a preset value, so that the packer rubber barrel is radially expanded to be sealed; the pressure relief mechanism is arranged at the lower end of the packer rubber cylinder and comprises a setting and deblocking short section sleeved on the central pipe, the setting and deblocking short section is connected with the packer rubber cylinder through a lower supporting sleeve, the pressure relief hole can be moved upwards by lifting the central pipe, an internal flow passage of the central pipe is communicated with a radial gap between the packer rubber cylinder and the central pipe, and deblocking is finished; wherein be equipped with a plurality of guide ways of extending along the axial on the outer wall of center tube, the adapter sleeve through the direction shear pin with guide way adaptation is connected be equipped with a plurality of keyway of extending along the axial on the outer wall of center tube, the setting deblocking nipple joint through prevent changeing the key with keyway adaptation is connected, thereby makes the packer packing element can follow the center tube rotates.
In one embodiment, the check valve assembly comprises a check valve housing fixedly connected with the connecting sleeve, a check valve body and a sleeve, wherein a shoulder with an upward end face 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 sleeve are installed in the annular space, the lower end face of the sleeve abuts against the shoulder, the check valve body is fixedly connected with the sleeve through a setting shear pin, a gap channel communicated with the liquid inlet hole and the annular space is formed between the connecting sleeve and the central pipe, and the check valve body is configured to seal the gap channel in an initial state and cut the setting shear pin and move downwards to open the gap channel when wellbore pressure reaches a preset value.
In one embodiment, the check valve assembly further comprises a spring sleeved on the central pipe, two ends of the spring respectively abut against the lower end face and the shoulder of the check valve body, 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.
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 sleeve comprises an inner rubber sleeve, an outer rubber sleeve and an elastic framework arranged between the inner rubber sleeve and the outer rubber sleeve, wherein the upper end of the outer rubber sleeve is fixedly connected with the upper supporting sleeve through a shoulder pad, and the lower end of the outer rubber sleeve is fixedly connected with the lower supporting sleeve.
In one embodiment, the length of the inner rubber sleeve is greater than that of the elastic framework, so that axially outward extending parts are formed at two ends of the inner rubber sleeve respectively, an upper supporting ring and a lower supporting ring are arranged at two ends of the packer rubber sleeve respectively, and the extending parts at two ends of the inner rubber sleeve form a pressing fit with the upper supporting sleeve and the lower supporting sleeve respectively through the upper supporting ring and the lower supporting ring.
In one embodiment, the one-way valve housing and the upper support ring are in clearance fit with the central tube, thereby forming a clearance flow passage communicating the annular space and the clearance between the packer rubber and the central 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 sleeve and the central tube through the gap flow passage, so that the packer rubber sleeve is radially expanded to complete setting.
In one embodiment, the elastic skeleton is integrated with the inner rubber sleeve and the outer rubber sleeve by means of vulcanization.
In one embodiment, the outer surface of the outer rubber sleeve is provided with a wear-resistant coating.
In one embodiment, the connection sleeve is fixedly connected with the outer wall of the central pipe through a deblocking shear pin, and during deblocking, the deblocking shear pin is sheared by lifting the central pipe upwards, and the pressure relief hole in the central pipe is moved upwards to a gap between the packer rubber sleeve and the central pipe to relieve pressure, so that deblocking is completed.
Compared with the prior art, the method has the advantages that:
the packer while drilling for isolating the high-pressure stratum overflow in the well can isolate the high-pressure overflow at a position below the packer so as to reduce the pressure of a well head, thereby providing favorable conditions for subsequent well killing operation. And the packer while drilling is in adaptive connection with the guide groove through the guide shear pin, and the anti-rotation key is in adaptive connection with the key groove, so that an anti-rotation structure is formed, a packer rubber cylinder, a liquid inlet mechanism and a pressure relief mechanism can synchronously rotate along with the central pipe, the function while drilling is realized, the integral connectivity of the packer while drilling can be effectively guaranteed, and the packing performance of the packer while drilling can be enhanced. In addition, the packer while drilling is wear-resistant and erosion-resistant in the drilling process, can adapt to the underground high-temperature and high-pressure environment, is very favorable for ensuring the packing performance of the packer while drilling and prolonging the service life of the packer while drilling. By using the packer while drilling, the blowout preventer of the wellhead is moved to the underground, the operation risk of the wellhead is greatly reduced, and the operation safety performance is obviously enhanced.
Drawings
The invention will now be described with reference to the accompanying drawings.
FIG. 1 is a semi-sectional view of a packer while drilling used to seal off high pressure formation kick downhole in accordance with the present invention.
FIG. 2 is a cross-sectional view of a fluid admitting 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, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it should be noted that the end near the wellhead of the packer while drilling for isolating high pressure formation overflow in the well is defined as the upper end or the like, and the end far from the wellhead is defined as the lower end or the like.
FIG. 1 is a semi-sectional view of a packer 100 while drilling for isolating high pressure formation kick downhole in accordance with the present invention. As shown in fig. 1, the packer while drilling 100 comprises a base pipe 1, which is a hollow tubular structure having an internal flow passage. And two ends of the central pipe 1 are respectively provided with a threaded joint for connecting other downhole tools. The upper outer wall of the central tube 1 is provided with a plurality of steps with the end faces facing downwards, preferably two steps, so as to form a step-shaped joint for connecting other parts. The side wall of the central tube 1 close to the upper end is provided with a liquid inlet hole 11 penetrating through the side wall, and the liquid inlet hole 11 is positioned on the axial inner side of the step-shaped joint. 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 functions of the inlet hole 11 and the pressure relief hole 12 will be described below.
As shown in fig. 1, the packer 100 while drilling further includes a packer rubber 2 sleeved on the neutral pipe 1, a liquid inlet mechanism 3 disposed at an upper end of the packer rubber 2, and a pressure relief mechanism 6 disposed at a lower end of the packer rubber 2. The liquid inlet mechanism 3 is constructed to enable fluid in an internal flow channel of the central tube 1 to pass through the liquid inlet hole 11 and enter a gap between the packer rubber cylinder 2 and the central tube 1 from the inside of the central tube 1 in a one-way mode when the shaft is suppressed to a preset value, so that the packer rubber cylinder 2 is radially expanded to perform packing, and therefore sealing of a drilling tool and a shaft wall annular gap is achieved. When needing the deblocking, lift center tube 1 and carry out the pressure release through pressure release mechanism 6, make center tube 1 lift to the clearance correspondence of pressure release hole 12 and packer packing element 2 and center tube 1 and release pressure for packer packing element 2 restores to warp, thereby accomplishes the deblocking.
According to the invention, the packer rubber 2 comprises an inner rubber sleeve 21, an outer rubber sleeve 22 and an elastic framework 23 arranged between the inner rubber sleeve 21 and the outer rubber sleeve 22. The upper end of the packer rubber barrel 2 is fixedly and hermetically connected with the liquid inlet mechanism 3 through an upper support sleeve 5, and the lower end of the packer rubber barrel is fixedly and hermetically connected with the pressure relief mechanism 6 through a lower support sleeve 7. In one embodiment, the resilient framework 23 is a supporting steel plate. In order to avoid extrusion of the packer rubber 2 during setting by inflation, a shoulder 24 is provided between the outer rubber sleeve 22 and the upper support sleeve 5. The upper end of the shoulder pad 24 is fixedly connected with the upper support sleeve 5 through threads, and the lower end part of the shoulder pad is correspondingly positioned at the radial outer part of the outer rubber sleeve 22 and extends along the axial direction to form wrapping type installation on the end part of the outer rubber sleeve 22, so that the outer rubber sleeve 22 can be well supported in the expansion process of the packer rubber sleeve 2, and the outer rubber sleeve 22 can be effectively prevented from being extruded.
The outer surface of the outer rubber cylinder 22 is provided with a wear-resistant coating. In one embodiment, the wear resistant coating may be, for example, a mechanical protective coating, nano-diamond, ceramic, or other wear resistant material sprayed on the outer surface of the outer rubber cylinder 22. The wear-resistant coating ensures that the packer rubber barrel 2 is wear-resistant and erosion-resistant in the drilling process, can adapt to the underground high-temperature and high-pressure environment, is very favorable for ensuring the packing performance of the packer 100 while drilling and prolonging the service life of the packer.
According to an embodiment of the present invention, the axial length of the inner rubber tube 21 is set to be greater than the axial length of the elastic bobbin 23, so that axially outward extensions are formed at both ends of the inner rubber tube 21, respectively. An upper support ring 8 and a lower support ring 9 are respectively arranged at two ends of the packer rubber barrel 2, and extension parts at two ends of the inner rubber barrel 21 are respectively matched with the upper support sleeve 5 and the lower support sleeve 7 in a pressing mode through the corresponding support rings 8. The inner rubber sleeve 21 can form stable connection through the support ring 8 and the end ring 9, and the two ends of the packer rubber sleeve 2 are effectively prevented from falling off.
As shown in fig. 2, the upper support ring 8 is fitted over the center tube 1, and the lower outer wall of the upper support ring 8 is configured as a tapered surface. The lower end of the upper support ring 8 is axially and downwardly installed between the extension part of the upper end of the inner rubber sleeve 21 and the radial direction of the central tube 1 through the conical surface, so that radial extrusion force is formed on the extension part of the upper end of the inner rubber sleeve 21 through the upper support ring 8. Thereby, the extension of the upper end of the inner rubber tube 21 is press-fitted between the upper support sleeve 5 and the upper support 8 in the radial direction by the upper support ring 8. In this embodiment, the upper support ring 8 is in clearance fit with the base pipe 1, so that fluid can flow through, and fluid entering the liquid inlet mechanism 3 can enter a gap between the packer rubber 2 and the base pipe 1.
Similarly, as shown in fig. 3, the lower support ring 9 is fitted around the center pipe 1, and the upper end outer wall of the lower support ring 9 is configured as a tapered surface. The upper end of the lower support ring 9 is axially and upwardly mounted between the extension part of the lower end of the inner rubber sleeve 21 and the radial direction of the central tube 1 through a conical surface, so that radial pressing force is formed on the extension part of the lower end of the inner rubber sleeve 21 through the lower support ring 9. Thereby, the extension of the lower end of the inner rubber tube 21 is press-fitted between the lower support sleeve 7 and the lower support sleeve 9 in the radial direction by the lower support ring 9. And a seal is formed between the extension of the lower end of the inner rubber sleeve 21 and the central tube 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 packer packing element 2 carries out the pressing mode installation through last support ring 8 and under bracing ring 9 can effectively avoid the both ends of packer packing element 2 to drop, has effectively guaranteed packer packing element 2's installation stability, is favorable to reinforcing packer packing element 2's packing performance very much.
As shown in fig. 2, the 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 a jacket 33. The one-way valve shell 31 is sleeved on the central tube 1, and the upper end of the one-way valve shell 31 is fixedly connected with a step-shaped joint on the outer wall of the upper end of the central tube 1 through a connecting sleeve 4. The inner wall of the check valve housing 31 is provided with a shoulder facing upwards so that an annular space 34 is formed between the shoulder and the axial direction of the connecting sleeve 4. The one-way valve body 32 and the end sleeve 33 are installed in the annular space 34, the lower end face of the end sleeve 33 abuts against a shoulder, and the one-way 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 configured into a step-shaped joint and is used for being matched and connected with the step-shaped joint of the outer wall of the upper end of the central tube 1. And the upper end of the connecting sleeve 4 is fixedly connected with the outer wall of the central pipe 1 through the deblocking shear pin 43, and during deblocking, the deblocking shear pin 43 is sheared by lifting the central pipe 1 upwards, and the pressure relief hole 12 on the central pipe 1 is moved upwards to the gap between the packer rubber sleeve 2 and the central pipe 1 to relieve pressure, so that deblocking is completed.
According to one embodiment of the present invention, the inner wall of the upper end portion of the connection sleeve 4 forms a seal with the outer wall of the center line pipe 1 at the upper end of the liquid inlet hole 11. And a gap channel is formed between the inner wall of the lower end part of the connecting sleeve 4 and the outer wall surface of the central tube 1 corresponding to the liquid inlet hole 11, and the gap channel is communicated with the liquid inlet hole 11 and the annular space 34. The valve body 32 of the one-way valve is configured to be able to block the slit passage in an initial state and to reach a predetermined value P when the wellbore is suppressed1The setting shear pin 35 is sheared and moved down to open the slit passage. In one embodiment, a through-hole 42 is provided through the side wall in the portion of the connection sleeve 4 that projects into the annular space 34. The through bore 42 communicates the slit passage with the annular space when the check valve body 32 descends to the lower end of the through bore 42, thereby opening the slit passage. Thereby, the fluid in the internal flow passage of the base pipe 1 passes through the liquid inlet hole 11, the slit passage, and the through hole 42 in this order and enters the annular space 34.
In one embodiment, the upper end of the check valve body 32 is provided with rubber, so that the slit passage can be effectively blocked by the rubber, and the sealing performance of the check valve assembly 3 is ensured.
The check valve assembly 3 further comprises a spring 36 sleeved on the central pipe 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 internal flow passage of the central pipe 1 is smaller than the fluid pressure in the annular space 34, so that the check valve body 32 resets to block the gap passage again, and therefore fluid in the internal flow passage of the central pipe 1 can only flow to the annular space 34 from the fluid inlet hole 11. Thereby, a function of the check valve assembly 3 enabling only one-way fluid flow is realized.
According to the invention, the one-way valve shell 31 and the upper support ring 8 are in clearance fit with the base pipe 1, so that a clearance flow passage communicating the annular space 34 and the clearance between the packer rubber 2 and the base pipe 1 is formed. The fluid in the central tube 1 enters the annular space 34 through the check valve assembly 3 and then enters the gap between the packer rubber 2 and the central tube 1 through the gap flow channel, so that the packer rubber 2 is radially expanded, and then the setting is completed.
As shown in fig. 3, the pressure relief mechanism 6 includes a setting and unsetting nipple 61 fitted on the central tube 1. The upper end outer wall of setting deblocking nipple joint 61 constructs into the step and connects, and the outer wall that the step connects is equipped with the screw thread, and setting deblocking nipple joint 61 passes through the step and connects 7 fixed connection with the lower support sleeve. The setting and unsetting short joint 61 is connected with the packer rubber sleeve 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 unsealing is needed, the central tube 1 is lifted upwards to enable the pressure relief hole 12 to move upwards, so that the internal flow channel of the central tube 1 is communicated with the radial gap between the packer rubber sleeve and the central tube 1, and the fluid pressure in the radial gap between the packer rubber sleeve and the central tube 1 is released, thereby completing the unsealing.
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 unsetting nipple 61. The first end ring is fitted around the base pipe 1, and the first end ring 81 is in clearance fit with the base pipe 1, thereby forming a gap through which fluid can flow. The upper and lower terminal surface of first end ring 81 supports the up end that leans on the lower terminal surface of check valve shell 31 and last support still 8 respectively to it is spacing to last support still 8 formation axial, effectively guarantees the installation that compresses tightly of the upper end of packer packing element 2. Similarly, the second end ring 91 is also sleeved on the central tube 1, and the upper and lower end surfaces of the second end ring 91 respectively abut against the lower end surface of the lower support ring 9 and the upper end surface of the setting and unsetting short section 61, so that the lower support ring 9 is axially limited, and the lower end of the packer rubber sleeve 2 is effectively guaranteed to be mounted in a pressing manner. From this, can effectively avoid the both ends of packer packing element 2 to drop, this is favorable to guaranteeing packer packing element 2's installation stability very much.
According to one embodiment of the invention, a plurality of axially extending guide grooves 13 are provided on the outer wall of the center tube 1 near the upper end, the plurality of guide grooves 13 being evenly distributed in the circumferential direction. The connecting sleeve 4 is in fit connection with the guide groove 13 through the guide shear pin 41 and can transmit torque. Meanwhile, a plurality of key grooves 14 extending in the axial direction are formed in the outer wall of the center tube 1 near the lower end, and the plurality of key grooves 14 are uniformly distributed in the circumferential direction. Setting and unsealing nipple 61 is through preventing that commentaries on classics key 62 and keyway 14 adapter coupling can transmit the moment of torsion. From this, through direction shear pin 41 and guide way 13 adaptation connection to and prevent changeing key 62 and keyway 14 adaptation connection, thereby form anti-rotation structure, make packer packing element 2, feed liquor mechanism 3, and pressure relief mechanism 6 can rotate along with central tube 1 is synchronous, thereby realize following the drill function.
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 connection sleeve 4 and the outer wall surface of the central pipe 1 at the upper end portion of the liquid inlet hole 11, a sealing member may be provided at a connection portion between the check valve housing 31 and the connection sleeve 4 and the upper support sleeve 5, a sealing member may be provided at a connection portion 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 central pipe 1, and the like.
In actual operation of the packer 100 while drilling for isolating high pressure formation kick downhole according to the present invention, the packer 100 while drilling is first connected to a string and lowered into the wellbore to a desired formation. When setting is needed, the pressure is held until the shaft pressure reaches a preset value P1When the valve body 32 of the one-way valve is pushed to cut the setting shear pin 35 and move downwards to open the gap channel and the through hole 42, so that the fluid in the internal 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 pressure build-up effect, the fluid entering the annular space 34 continues to pass through the gap flow channel between the one-way valve shell 31, the upper support ring 8, the first end ring and the base pipe 1, and enters the gap between the packer rubber sleeve 2 and the base pipe 1. The fluid enters the gap between the inner rubber tube 21 and the central tube 1 to make the inner rubber tube 21 fill liquid and expand, the inner rubber tube 21 drives the elastic framework 23 and the outer rubber tube 22 to expand radially at the same time until the pressure in the central tube 1 reaches the set valueP2The rear packer packing element 2 is fully expanded, thereby completing the setting. By having the packer 100 while drilling equivalent to moving a wellhead blowout preventer downhole, this greatly reduces wellhead operation risks, significantly enhancing operational safety.
According to one embodiment of the invention, a circulation nipple (not shown) is connected to the upper end of the base pipe 1, and the circulation nipple is provided with a circulation hole for communicating the internal flow passage of the base pipe 1 with the well bore annulus. After the setting is finished, the pressure is continuously suppressed until the pressure in the central tube 1 reaches P3When the pressure is applied, the circulation holes in the pipe string are opened to communicate the pressure inside and outside the pipe string. At this time, the fluid pressure in the internal flow passage of the base pipe 1 is reduced to be balanced with the wellbore pressure and is lower than the fluid pressure in the check valve assembly 30, so that the check valve 32 is returned by the spring 36, thereby closing the check valve assembly 30 and maintaining the fluid pressure between the packer rubber 2 and the base pipe 1 at P3And is not changed. Therefore, after the circulation hole is opened, the packer rubber barrel can be kept in a setting state all the time. This allows recirculation of heavy slurry above the packer rubber 2, thereby providing an advantage in treating the overflow. It is understood that P here1Less than P2，P2Less than P3。
After the completion overflow operation, when needing the deblocking, cut deblocking shear pin 43 through lifting center tube 1 up, make center tube 1 go upward and produce axial relative motion with pressure relief mechanism 6, packer packing element 2 and feed liquor mechanism, from this, make pressure release hole 12 move up, and make the internal flow of center tube 1 pass through the radial clearance who communicates packer packing element 2 and center tube 1, release the high pressure in the radial clearance of packer packing element 2 and center tube 1, packer packing element 2 resumes the deformation under the effect of self elasticity and elastic skeleton 23, thereby accomplish the deblocking.
The packer 100 while drilling for isolating high pressure formation kick downhole according to the present invention can isolate the high pressure kick at a location below the packer to reduce the wellhead pressure, which can provide advantages for subsequent kill operations. In addition, the packer 100 while drilling is in adaptive connection with the guide groove 13 through the guide shear pin 41, and the anti-rotation key 62 is in adaptive connection with the key groove 14, so that an anti-rotation structure is formed, the packer rubber cylinder 2, the liquid inlet mechanism 3 and the pressure relief mechanism 6 can synchronously rotate along with the central pipe 1, the function while drilling is achieved, the integral connectivity of the packer 100 while drilling can be effectively guaranteed, and the packing performance of the packer 100 while drilling can be enhanced. In addition, the packer 100 while drilling is wear-resistant and erosion-resistant in the drilling process, can adapt to the underground high-temperature and high-pressure environment, is very favorable for 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-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present 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 embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A packer while drilling for packing a downhole formation overflow, comprising:
the device comprises a hollow tubular central pipe (1), wherein the side wall areas of the central pipe close to two ends are respectively provided with a liquid inlet hole (11) and a pressure relief hole (12);
a packer rubber cylinder (2) sleeved on the central pipe;
the liquid inlet mechanism (3) is arranged at the upper end of the packer rubber barrel and comprises a one-way valve assembly (30), 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 barrel 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 and enter a gap between the packer rubber barrel and the central pipe in a single direction under the action of the one-way valve assembly when a shaft is suppressed to a preset value, so that the packer rubber barrel is expanded radially to be sealed; and
the pressure relief mechanism (6) is arranged at the lower end of the packer rubber cylinder and comprises a setting and deblocking short section (61) sleeved on the central pipe, the setting and deblocking short section is connected with the packer rubber cylinder through a lower support sleeve (7), the central pipe is lifted upwards to enable the pressure relief hole to move upwards, so that an internal flow channel of the central pipe is communicated with a radial gap between the packer rubber cylinder and the central pipe, and deblocking is completed;
wherein be equipped with a plurality of guide ways (13) of extending along the axial on the outer wall of center tube, the adapter sleeve through direction shear pin (41) with guide way adaptation connection be equipped with a plurality of keyway (14) of extending along the axial on the outer wall of center tube, the setting deblocking nipple joint through prevent commentaries on classics key (62) with keyway adaptation connection, thereby make the packer packing element can follow the center tube rotates.
2. The packer while drilling as recited in claim 1, wherein the one-way valve assembly comprises a one-way valve housing (31) fixedly connected with the connecting sleeve, a one-way valve body (32) and a sleeve (33), an inner wall of the one-way valve housing is provided with a shoulder with an upward end face, 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 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 (35), a gap channel communicated with the liquid inlet hole and the annular space is formed between the connecting sleeve and the central pipe, the check valve body is constructed to be used for plugging the gap channel in an initial state, and the setting shear pin is cut off and descends to open the gap channel when the pressure of a shaft reaches a preset value.
3. The packer while drilling of claim 2, wherein the check valve assembly further comprises a spring (36) disposed around the central tube, opposite ends of the spring abutting against the lower end surface and the shoulder of the check valve body, respectively, the spring being resilient to allow the check valve body to re-block the interstitial channel, thereby allowing fluid flow only from the inlet port to the annular space.
4. A packer while drilling as claimed in claim 2 or 3, wherein the portion of the connection sleeve projecting into the annular space is provided with a through bore (42) through the sidewall, the through bore communicating the interstitial channel with the annular space when the check valve body is lowered to the lower end of the through bore.
5. The packer while drilling as recited in claim 2 or 3, wherein the packer rubber comprises an inner rubber sleeve (21), an outer rubber sleeve (22) and an elastic framework (23) arranged between the inner rubber sleeve and the outer rubber sleeve, the upper end of the outer rubber sleeve is fixedly connected with the upper support sleeve through a shoulder protector (24), and the lower end of the outer rubber sleeve is fixedly connected with the lower support sleeve.
6. The packer while drilling as recited in claim 5, wherein the length of the inner rubber sleeve is greater than that of the elastic framework, so that axially outward extending portions are respectively formed at two ends of the inner rubber sleeve, an upper support ring (8) and a lower support ring (9) are respectively arranged at two ends of the packer rubber sleeve, and the extending portions at two ends of the inner rubber sleeve are respectively in press fit with the upper support sleeve and the lower support sleeve through the upper support ring and the lower support ring.
7. The packer as drilling tool of claim 6, wherein the check valve housing and the upper support ring are each in clearance fit with the base pipe to form a clearance flow path communicating the annular space and a clearance between the packer rubber and the base pipe,
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 sleeve and the central tube through the gap flow passage, so that the packer rubber sleeve is radially expanded to complete setting.
8. The packer as drilling tool of claim 5, wherein the elastomeric carcass is integrally formed with the inner and outer barrels by vulcanization.
9. The packer as drilling tool of claim 5, wherein an outer surface of the outer packer element is provided with a wear resistant coating.
10. The packer while drilling as recited in claim 7, wherein the connection sleeve is fixedly connected with the outer wall of the central pipe through a deblocking shear pin (43), and when deblocking is performed, the deblocking shear pin is sheared by lifting the central pipe upwards, and the pressure relief hole in the central pipe is moved upwards to a gap between the packer rubber sleeve and the central pipe to relieve pressure, so that deblocking is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491095.3A CN114645688A (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for packing underground high-pressure stratum overflow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491095.3A CN114645688A (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for packing underground high-pressure stratum overflow |
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| CN114645688A true CN114645688A (en) | 2022-06-21 |
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| CN202011491095.3A Pending CN114645688A (en) | 2020-12-17 | 2020-12-17 | Packer while drilling for packing underground high-pressure stratum overflow |
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Cited By (1)
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| CN115628021A (en) * | 2022-10-28 | 2023-01-20 | 西南石油大学 | Along with boring shaft bottom sand removal instrument |
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