CN114646458A - Device and method for testing performance of downhole packer - Google Patents
Device and method for testing performance of downhole packer Download PDFInfo
- Publication number
- CN114646458A CN114646458A CN202011492490.3A CN202011492490A CN114646458A CN 114646458 A CN114646458 A CN 114646458A CN 202011492490 A CN202011492490 A CN 202011492490A CN 114646458 A CN114646458 A CN 114646458A
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- 238000012360 testing method Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title description 9
- 210000002445 nipple Anatomy 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 238000012546 transfer Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a downhole packer performance testing device, which comprises a testing pipe string connected with a drilling tool, wherein the testing pipe string comprises: a packer that is set under pressure; the circulating short section is arranged below the packer, is started under certain pressure and establishes a circulating channel inside and outside the test pipe string; the pressure holding mechanism is arranged below the circulating short section and is configured to be capable of sealing the inside of the test pipe string after being started so as to hold pressure above the test pipe string; after the pressure holding mechanism is started, holding pressure in the test pipe string, and setting the packer in an annular space between the test pipe string and the well wall when the pressure is increased to a certain value; and after the pressure is continuously increased, the circulation nipple is opened, circulation is established below the packer, and the pressure in the drilling tool is measured to obtain the seal checking pressure at the lower part of the packer.
Description
Technical Field
The invention relates to a device and a method for testing the performance of an underground packer, and belongs to the field of testing of oil and gas field drilling devices.
Background
The underground blowout preventer is connected with a drilling tool and rotates along with the drilling tool, the underground blowout preventer can be matched with a wellhead blowout preventer to treat underground overflow, an underground blowout preventer packer unit adopts an expansion structure to meet the requirement of annular sealing with large expansion ratio, large extrusion deformation and upward displacement occur in the packer setting process, a shoulder protecting structure is designed at the upper end of a packer rubber sleeve, the packer shoulder protecting structure adopts a metal plastic material with better ductility and is designed into a sawtooth structure, the shoulder protecting structure deforms and clings to a well wall in the packer expansion sealing process, the friction force between the packer and the well wall is increased, the opening faces the rubber sleeve after the shoulder protecting structure deforms, the rubber sleeve is prevented from being damaged by lower annular high pressure, and the pipe column shoulder protecting structure is lifted to shrink when the packer is unpacked. Because conventional packer goes into well experimental restriction by wellbore structure can only realize annular pressure testing, unable true test packer operating condition to lift on the deblocking packer annular pressure testing lead to the packer to take place the deblocking action in advance easily, consequently annular pressure testing method can not verify the function of shoulder pad on the conventional packer, and lead to the packer deblocking easily, carry out ground test usually, can not fully verify downhole preventer function.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a device and a method for testing the performance of an underground packer, which can realize setting in a pipe and carry out pressure sealing performance test on the lower annular space of the packer after setting.
In one aspect of the present invention, a downhole packer performance testing apparatus is provided, including:
a test string for connecting a drilling tool, the test string comprising:
a packer that is set under pressure;
the circulating short section is arranged below the packer, is started under certain pressure and establishes a circulating channel inside and outside the test pipe string; and
the pressure holding mechanism is arranged below the circulating short section and is configured to be capable of sealing the inside of the test pipe string after being started so as to hold pressure above the test pipe string;
after the pressure holding mechanism is started, holding pressure in the test pipe string, and setting the packer in an annular space between the test pipe string and the well wall when the pressure is increased to a certain value; and after the pressure is continuously increased, the circulation nipple is opened, circulation is established below the packer, and the pressure in the drilling tool is measured to obtain the seal checking pressure at the lower part of the packer.
The invention further improves the technical scheme that the packer comprises a central pipe connected to the drilling tool, and a packer shell is arranged on the outer side of the central pipe; a rubber sleeve is arranged on the packer shell;
the central pipe is provided with pressure transmitting holes along the radial direction, and the pressure transmitting holes are communicated with the inside of the central pipe and the inner side of the rubber cylinder; and the pressure in the central tube is transmitted to the inner side of the rubber tube through the pressure transmitting hole, and the rubber tube is pushed to expand and set by the pressure.
The invention further improves the technical scheme that the pressure transfer hole is arranged at the upper part of the central pipe, and a flow passage is arranged between the central pipe and the packer shell; the pressure transmitting hole is connected with the inner side of the rubber cylinder through a flow passage.
The invention is further improved in that a single valve is arranged in the pressure transfer hole, and liquid enters the flow channel from the central pipe through the single valve;
the lower part of the central pipe is provided with a pressure relief hole; the pressure relief valve is arranged below the rubber cylinder and the flow channel; after the sealing is set, the testing pipe string is lifted up to move the pressure relief hole to the position of the rubber cylinder, and the rubber cylinder is relieved through the pressure relief hole.
The invention has the further improvement that the circulating short section comprises a circulating short section body, the outer wall of the circulating short section body is provided with a circulating hole, and a differential pressure sliding sleeve is arranged in the circulating short section body;
when in an initial state, the differential pressure sliding sleeve is in a first position and blocks the circulating hole; the pressure difference sliding sleeve can move to a second position in the circulation nipple body under the action of pressure, and the circulation hole is opened.
The invention has the further improvement that the upper end surface of the pressure difference sliding sleeve is provided with an annular pressure difference surface, and the pressure difference sliding sleeve is connected with the circulating short section body through shear pins when in the first position.
The invention is further improved in that the inner side of the circulation nipple body is provided with an inner limiting step, the outer wall of the pressure difference sliding sleeve is provided with an outer limiting step, and when the pressure difference sliding sleeve moves to the second position, the inner limiting step is in butt joint fit with the outer limiting step.
The invention has the further improvement that a plurality of sealing rings are arranged between the outer walls of the two ends of the differential pressure sliding sleeve and the inner wall of the circulation nipple body.
In a further improvement of the present invention, the pressure-holding mechanism includes a ball seat, and after the pressure-holding ball is put into the pressure-holding mechanism, the pressure-holding ball is engaged with the ball seat, so as to block the inside of the test tube string and hold the upper portion of the test tube string.
According to another aspect of the invention, a downhole packer performance testing method is also provided, which comprises the following steps:
assembling the downhole packer performance testing device;
putting a pressure-holding ball to hold the pressure-holding mechanism, setting the packer when the pressure in the test pipe string is increased, and then opening the circulation channel by the circulation nipple;
and detecting the pressure in the test pipe string so as to obtain the seal checking pressure of the lower part of the packer.
Compared with the prior art, the invention has the advantages that:
the device and the method for testing the performance of the downhole packer can realize setting in a pipe and carry out pressure sealing performance test on the lower annular space of the packer after setting. According to the invention, the packer is lowered to a setting position, a pressure holding condition is established by throwing a pressure holding ball to reach a ball seat position, and the pressure in the pipe is increased to reach a packer setting condition so as to set the packer; and continuously suppressing pressure after the packer is set, opening a circulating short section at the lower end of the packer to enable the lower annulus of the packer to be communicated with the pipe string, continuously suppressing pressure in the pipe, and enabling the pressure in the pipe to enter the lower end of the packer through the circulating short section, so that the pressure test of the lower annulus of the packer is realized, and the performance verification of the setting state of the packer is really verified.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic structural diagram of a downhole packer performance testing apparatus according to an embodiment of the invention, showing an initial state;
FIG. 2 is a schematic structural diagram of a downhole packer performance testing device according to an embodiment of the invention, showing the states of packer setting and circulating pup joint opening;
FIG. 3 is a schematic structural diagram of a downhole packer performance testing device according to an embodiment of the invention, showing the state of seal verification of the lower annulus of the packer;
FIG. 4 is a schematic structural diagram of a packer according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a circulation nipple according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a pressure building mechanism according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. the device comprises a circulating short section, 2, a packer, 3, a pressure-building mechanism, 4, a drilling tool, 5, a well wall, 11, a circulating short section body, 12, a pressure difference sliding sleeve, 13, a circulating hole, 14, a shear pin, 15, an inner limiting step, 16, an outer limiting step, 21, a central pipe, 22, a rubber sleeve, 23, a pressure transmission hole, 24, a pressure relief hole, 25, a flow channel, 31, a ball seat, 32 and a pressure-building ball.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically shows a downhole packer performance testing apparatus according to an embodiment of the present invention, including a test string connected to the lower side of a drilling tool 4. The test tube string comprises a packer 2, and the packer 2 is set under the action of a certain pressure. And a circulation nipple 1 is arranged below the packer 2, and the circulation nipple 1 is started under certain pressure and establishes a circulation channel inside and outside the test pipe string. And a pressure-building mechanism 3 is arranged below the circulation nipple 1, and the pressure-building mechanism 3 is constructed to be capable of sealing the inside of the test tube string after being started so as to build pressure above the test tube string. Wherein the pressure for starting the circulation nipple 1 is larger than the pressure for setting the packer 2.
When the downhole packer performance testing device is used, after the pressure holding mechanism 3 is started, the pressure is held in the test pipe string, and when the pressure is increased to a certain value, the packer 2 is set in an annular space between the test pipe string and the well wall 5; and after the pressure is continuously increased, the circulation nipple 1 is opened, circulation is established below the packer 2, and the pressure in the drilling tool 4 is measured to obtain the seal checking pressure at the lower part of the packer 2.
In one embodiment, the packer 2 comprises a base pipe 21 attached to the drilling tool 4, the base pipe 21 being a cylindrical tubular structure. The outside of the central tube 21 is provided with a packer casing, and the packer casing is of a cylindrical structure and is sleeved outside the central tube 21. The packer casing is provided with a packing element 22, and the packing element 22 can expand under the action of pressure. In this embodiment, the rubber sleeve 22 is externally provided with a metal shoulder of the packer 2 for setting with the borehole wall 5.
Wherein, the central tube 21 is provided with a pressure transfer hole 23 along the radial direction, and the pressure transfer hole 23 communicates the inside of the central tube 21 and the inside of the rubber cylinder 22; the pressure in the central tube 21 is transmitted to the inner side of the rubber cylinder 22 through the pressure transmission hole 23, and the rubber cylinder 22 is pushed to expand and set by the pressure.
When the downhole packer performance testing device according to the embodiment is used for testing, after the pressure is suppressed by the pressure suppressing mechanism 3, the pressure of the liquid in the central pipe 21 is increased. When the pressure is increased to a certain degree, the liquid enters the inner side of the rubber tube 22 through the pressure transmitting hole 23 of the central tube 21, and the rubber tube 22 starts to expand and set under the action of the liquid pressure.
In a preferred embodiment, the pressure transfer hole 23 is arranged at the upper part of the base pipe 21, and a flow passage 25 is arranged between the base pipe 21 and the packer shell; the pressure transfer hole 23 is connected with the inner side of the rubber cylinder 22 through a flow passage 25.
In one embodiment, a single valve is arranged in the pressure transfer hole 23, and liquid enters the flow passage 25 from the central pipe 21 through the single valve, so that the packer 2 is also in a setting state after the pressure build-up is stopped. The lower part of the central tube 21 is provided with a pressure relief hole 24; the pressure relief valve is arranged below the rubber cylinder 22 and the flow channel 25; after setting, the test tube string is lifted up to move the pressure relief hole 24 to the position of the rubber cylinder 22, and the rubber cylinder 22 is relieved of pressure through the pressure relief hole 24.
When the pipe string needs to be unpacked, the rubber sleeve 22 is fixed with the packer shell because the rubber sleeve 22 is in a setting state, and the central pipe 21 moves upwards along with the pipe string. When the pressure relief hole 24 moves to the position of the rubber cylinder 22, the rubber cylinder 22 is relieved through the pressure relief hole 24, and therefore unsealing is completed.
In one embodiment, the circulating short section 1 comprises a circulating short section body 11, and the circulating short section body 11 is a tubular short section structure, and a circulating hole 13 is arranged in the upper part of the circulating short section structure along the radial direction. The inside of circulation nipple joint body 11 is provided with pressure differential sliding sleeve 12, and pressure differential sliding sleeve 12 can slide in the inside of circulation nipple joint body 11 under the effect of pressure. Wherein, the differential pressure sliding sleeve 12 is in a first position in an initial state and blocks the circulation hole 13; when the pressure reaches a certain value, the differential pressure sliding sleeve 12 moves to a second position, so that the circulating hole 13 is opened.
In a preferred embodiment, the upper end surface of the differential pressure sliding sleeve 12 is provided with a differential pressure surface, and the differential pressure surface is used for bearing pressure and providing a downward force for the differential pressure sliding sleeve 12. In this embodiment, in the initial state, the differential pressure sliding sleeve 12 is in the first position and is connected to the circulation nipple body 11 through the shear pins 14.
When the downhole blowout preventer for treating downhole overflow according to the embodiment is used, after the pressure-holding mechanism 3 holds pressure, the packer 2 is set when the pressure reaches a certain value, the pressure continues to be increased, and the shear pin 14 is sheared when the pressure applied to the pressure difference surface is greater than the shearing force of the shear pin 14. At this time, the differential pressure sliding sleeve 12 is pushed downward by the pressure applied to the differential pressure surface, and moves to the second position. When the differential pressure sliding sleeve 12 moves to the second position, the circulating hole 13 is opened, so that circulation is performed. In the present embodiment, the circulation hole 13 can be prevented from being opened in advance by providing the shear pins 14, and the pressure for opening the circulation hole 13 is controlled by selecting the shear pins 14.
In one embodiment, an inner limiting step 15 is arranged on the inner side of the circulation nipple body 11, an outer limiting step 16 is arranged on the outer wall of the pressure difference sliding sleeve 12, and when the pressure difference sliding sleeve 12 moves to the second position, the inner limiting step 15 is in clamping fit with the outer limiting step 16.
In one embodiment, a plurality of sealing rings are arranged between the outer walls of the two ends of the differential pressure sliding sleeve 12 and the inner wall of the circulation nipple body 11. When the differential pressure sliding sleeve 12 is at the first position, the sealing ring at the upper part is positioned above the circulating hole 13; the lower sealing ring is positioned below the second step. In this way, complete sealing of the circulation hole 13 can be ensured by the sealing ring.
In a preferred embodiment, the pressure holding mechanism 3 includes a ball seat 31, and after the pressure holding ball 32 is put into the pressure holding mechanism, the pressure holding ball 32 is clamped on the ball seat 31, so as to seal the inside of the test tube string and hold the pressure on the upper portion of the test tube string.
According to another aspect of the invention, a downhole packer performance testing method is provided, and the method is realized by the downhole packer performance testing device in the embodiment. The method comprises the following steps:
and (3) assembling the downhole packer performance testing device, namely assembling the packer 2, the circulation nipple 1 and the pressure building mechanism 3 into a testing pipe string and connecting the testing pipe string with a drilling tool 4.
Putting a pressure holding ball 32, wherein the pressure holding ball 32 is positioned at the pressure holding mechanism 3 to hold the pressure holding mechanism 3, the pressure in the test pipe string is increased, and when the pressure in the test pipe string reaches a certain value, the packer 2 is set; the pressure is then increased until the circulation nipple 1 opens the circulation channel.
And detecting the pressure in the test pipe string so as to obtain the lower seal checking pressure of the packer 2.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A downhole packer performance testing device, comprising:
a test string connecting a drilling tool (4), the test string comprising:
a packer (2), said packer (2) being set at a pressure;
the circulating short section (1) is arranged below the packer (2), the circulating short section (1) is started under certain pressure, and circulating channels are established inside and outside the test pipe string; and
the pressure-holding mechanism (3) is arranged below the circulating short section (1), and the pressure-holding mechanism (3) is configured to be capable of sealing the inside of the test tube string after being started so as to hold pressure above the test tube string;
after the pressure building mechanism (3) is started, building pressure inside the test pipe string, and setting the packer (2) in an annular space between the test pipe string and the well wall (5) when the pressure is increased to a certain value; and after the pressure is continuously increased, the circulation nipple (1) is opened, circulation is established below the packer (2), and the pressure in the drilling tool (4) is measured to obtain the seal checking pressure at the lower part of the packer (2).
2. A downhole packer performance testing device according to claim 1, characterized in that the packer (2) comprises a base pipe (21) connected to the drill tool (4), and a packer housing is arranged outside the base pipe (21); a rubber sleeve (22) is arranged on the packer shell;
wherein, a pressure transfer hole (23) is arranged on the central tube (21) along the radial direction, and the pressure transfer hole (23) is communicated with the inside of the central tube (21) and the inner side of the rubber cylinder (22); the pressure in the central tube (21) is transmitted to the inner side of the rubber cylinder (22) through the pressure transmission hole (23), and the rubber cylinder (22) is pushed to expand and set by the pressure.
3. A downhole packer performance testing device according to claim 2, characterized in that the pressure transfer hole (23) is arranged in the upper part of the base pipe (21), and a flow channel (25) is arranged between the base pipe (21) and the packer housing; the pressure transfer hole (23) is connected with the inner side of the rubber cylinder (22) through a flow passage (25).
4. A downhole packer performance testing device according to claim 3, characterised in that a single valve is arranged in the pressure transfer bore (23), through which liquid from the base pipe (21) enters the flow channel (25);
the lower part of the central pipe (21) is provided with a pressure relief hole (24); the pressure relief valve is arranged below the rubber cylinder (22) and the flow channel (25); after setting, the test tube string is lifted up to move the pressure relief hole (24) to the position of the rubber cylinder (22), and the rubber cylinder (22) is relieved through the pressure relief hole (24).
5. The downhole packer performance testing device according to any one of claims 1 to 4, wherein the circulation nipple (1) comprises a circulation nipple body (11), a circulation hole (13) is formed in the outer wall of the circulation nipple body (11), and a differential pressure sliding sleeve (12) is arranged in the circulation nipple body (11);
wherein, in an initial state, the differential pressure sliding sleeve (12) is in a first position and blocks the circulating hole (13); the differential pressure sliding sleeve (12) can move to a second position in the circulation nipple body (11) under the action of pressure, and the circulation hole (13) is opened.
6. The downhole packer performance testing device according to claim 5, wherein an annular pressure difference surface is arranged on the upper end surface of the pressure difference sliding sleeve (12), and the pressure difference sliding sleeve (12) is connected with the circulation nipple body (11) through shear pins (14) in the first position.
7. The downhole packer performance testing device according to claim 6, wherein an inner limiting step (15) is arranged on the inner side of the circulation nipple body (11), an outer limiting step (16) is arranged on the outer wall of the differential pressure sliding sleeve (12), and when the differential pressure sliding sleeve (12) moves to the second position, the inner limiting step (15) is in butt fit with the outer limiting step (16).
8. The downhole packer performance testing device according to claim 7, wherein a plurality of sealing rings are arranged between the outer walls of the two ends of the differential pressure sliding sleeve (12) and the inner wall of the circulation nipple body (11).
9. The downhole packer performance testing device according to claim 8, wherein the pressure build-up mechanism (3) comprises a ball seat (31), and after a pressure build-up ball (32) is thrown in, the pressure build-up ball (32) is snapped in the ball seat (31) so as to seal the inside of the test string and build up pressure on the upper portion of the test string.
10. A downhole packer performance testing method is characterized by comprising the following steps:
assembling a downhole packer performance testing apparatus according to any one of claims 1 to 9;
putting a pressure-holding ball (32) to hold the pressure of the pressure-holding mechanism (3), setting the packer (2) when the pressure in the test pipe string is increased, and then opening a circulation channel by the circulation nipple (1);
and detecting the pressure in the test pipe string so as to obtain the seal checking pressure of the lower part of the packer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492490.3A CN114646458A (en) | 2020-12-17 | 2020-12-17 | Device and method for testing performance of downhole packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492490.3A CN114646458A (en) | 2020-12-17 | 2020-12-17 | Device and method for testing performance of downhole packer |
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| Publication Number | Publication Date |
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| CN114646458A true CN114646458A (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011492490.3A Pending CN114646458A (en) | 2020-12-17 | 2020-12-17 | Device and method for testing performance of downhole packer |
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| CN (1) | CN114646458A (en) |
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