CN115596395A - Safe abandoned well plugging method - Google Patents
Safe abandoned well plugging method Download PDFInfo
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- CN115596395A CN115596395A CN202110773244.3A CN202110773244A CN115596395A CN 115596395 A CN115596395 A CN 115596395A CN 202110773244 A CN202110773244 A CN 202110773244A CN 115596395 A CN115596395 A CN 115596395A
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- plugging
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- packer
- releasing
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 72
- 230000000903 blocking effect Effects 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims description 22
- 238000005553 drilling Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 14
- 239000000243 solution Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a safe abandoned well plugging method, and belongs to the technical field of oil field well plugging. The safety abandoned well plugging method comprises the following steps: separating a plugging layer and a layer to be plugged in the sleeve; placing a releasing packer into the casing and setting the releasing packer above the plugging layer; cementing the plugging layer; sealing the releasing packer, and pressurizing cement in the plugging layer to enable the cement to enter an oil layer of the plugging layer; and after the cement in the blocking layer is solidified, opening the blocking layer and the layer to be blocked, and blocking the layer to be blocked. The method for safely abandoning the well plugging can protect the casing, effectively reduce the risk of plugging construction, shorten the construction period, improve the plugging quality and reduce the construction cost.
Description
Technical Field
The invention relates to the technical field of oil field well plugging, in particular to a safe abandoned well plugging method.
Background
At present, the plugging method of abandoned wells in Liaohe oil field is from top to bottom, drilling out after each plugging layer is plugged by a cement plug, and drilling out the cement plug to plug the next layer after the pressure test is qualified. This kind of shutoff mode, the cost is lower, but is great to the longer well of abandoning of service life danger coefficient, because the casing pipe of shutoff above the shutoff layer all will bear great cement injection pressure each time, so when the shutoff layer absorption effect is not good, can cause cement injection pressure to increase, makes risk coefficient greatly increased simultaneously, in case the casing pipe breaks this moment, will cause the engineering accident.
Disclosure of Invention
The invention provides a method for plugging a safe abandoned well, which solves or partially solves the technical problems that in the prior art, a casing pipe plugged above a plugging layer in the plugging method of the abandoned well bears larger cementing pressure each time, so that the risk coefficient is increased, and once the casing pipe is broken at the moment, an engineering accident is caused.
In order to solve the technical problem, the invention provides a method for plugging a safe abandoned well, which comprises the following steps: separating a plugging layer and a layer to be plugged in the sleeve; placing a releasing packer into the casing and setting the releasing packer above the plugging layer; cementing the plugging layer; sealing the releasing packer, and pressurizing cement in the plugging layer to enable the cement to enter an oil layer of the plugging layer; and after the cement in the blocking layer is solidified, opening the blocking layer and the layer to be blocked, and blocking the layer to be blocked.
Further, the separation of the plugging layer and the layer to be plugged in the casing comprises: and placing a cement plug into the sleeve, and arranging the cement plug between the blocking layer and the layer to be blocked.
Further, the cement plug is arranged 5-10 meters below the plugging layer.
Further, the placing of the releasing packer into the casing comprises: placing the releasing packer into the casing through a releasing string; and when the releasing packer reaches the upper part of the plugging layer, pressing the setting releasing packer to seal the releasing packer with the sleeve.
Further, the releasing packer is anchored on the inner wall of the casing through slips; and when the sealing of the releasing packer is finished, the releasing tubular column is taken out.
Further, the cementing the plugging layer comprises: and (4) penetrating the extruded plugging pipe column through the releasing packer to the bottom of the plugging layer, and performing cementing.
Further, the sealing a release packer and pressurizing cement within the plugging layer comprises: a sealing mandrel is arranged on the extrusion plugging pipe column; lifting the extrusion blocking pipe column to enable a sealing mandrel on the extrusion blocking pipe column to reach the central pipe of the releasing packer and sealing; pressurizing cement in the plugging layer through the extrusion plugging pipe column so that the cement enters an oil layer of the plugging layer; and when the pressurization is finished, the extrusion plugging pipe column is taken out.
Further, after the cement in the plugging layer is solidified, the safe abandoned well plugging method further comprises the following steps: running a reamer bit into the casing; and grinding the cement solidified at the plugging layer in the sleeve by the reaming bit, and performing pressure test.
Further, the step of opening the plugging layer and the layer to be plugged comprises the step of drilling the cement plug through the reaming bit when the pressure test is qualified; pulling out the reamer bit while the cement plug is drilled through; and plugging the layer to be plugged.
And further, when the plugging of the layer to be plugged is finished, the releasing packer is lifted out.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the packer is separated from the layer to be plugged in the sleeve, the packer is placed in the sleeve and is arranged above the packer, the packer is injected with cement, the packer is sealed, and the cement in the packer is pressurized, so that the cement enters an oil layer of the packer, high pressure generated by the pressurized cement cannot be transmitted to the packer, the sleeve above the packer is fully protected, the plugging construction risk is effectively reduced, the construction period is shortened, the plugging quality is improved, the construction cost is reduced, after the cement in the layer to be plugged is solidified, the packer and the layer to be plugged are opened, the layer to be plugged is plugged, so that the high pressure generated by squeezing the cement in the layer to be plugged is blocked by the solidified cement at the part of the packer and cannot be transmitted to the above the packer, the sleeve is fully protected, the plugging construction risk is effectively reduced, the construction period is shortened, the plugging quality is improved, and the construction cost is reduced.
Drawings
Fig. 1 is a schematic plugging diagram of a safe abandoned well plugging method according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the safety abandoned well plugging method provided by the embodiment of the invention comprises the following steps:
And 2, putting the releasing packer 5 into the sleeve 2 and arranging the releasing packer above the plugging layer 3.
And 3, cementing the plugging layer 3.
And 4, sealing the releasing packer 5, and pressurizing cement in the plugging layer 3 to enable the cement to enter an oil layer of the plugging layer 3.
And 5, after the cement in the blocking layer 3 is solidified, opening the blocking layer 3 and the layer 4 to be blocked, and blocking the layer 4 to be blocked.
This application embodiment is owing to separate shutoff layer 3 and treat shutoff layer 4 in sleeve pipe 2, put into sleeve pipe 2 release packer 5, and set up in shutoff layer 3 top, carry out the cement injection to shutoff layer 3, seal up release packer 5, and pressurize the cement in shutoff layer 3, make cement get into in the oil reservoir of shutoff layer 3, so, the high pressure that extruded cement produced can not transmit more than the release shutoff 5 ware, sleeve pipe 2 more than sufficient protection release packer 5, effectively reduce shutoff construction risk, shorten construction cycle, improve the shutoff quality, reduce construction cost, because treat the cement solidification back in shutoff layer 3, unblock shutoff layer 3 and treat shutoff layer 4, treat shutoff layer 4 and carry out the shutoff, so, the high pressure that produces at the cement of treating shutoff layer 4 extrusion is hindered by the cement that shutoff layer department 3 solidifies, can not transmit more than shutoff layer 3, the sleeve pipe 2 has fully been protected, effectively reduced the shutoff risk, shorten the shutoff cycle, improve the construction quality, reduce construction cost.
Specifically, the separation of the plugging layer 3 from the layer to be plugged 4 within the casing 2 comprises:
put into sleeve pipe 2 with cement stopper 1 in, and set up at shutoff layer 3 and treat between shutoff layer 4, separate shutoff layer 3 and treat shutoff layer 4 through cement stopper 1, because cement stopper 1 cost is low, easily acquires, can reduce cost.
In the embodiment, the cement plug 1 is arranged 5-10 meters below the plugging layer 3, so that cement can enter the oil layer of the plugging layer 3.
In this embodiment, the cement plug 1 has a thickness of 10 meters, ensuring that the blocking layer 3 can be separated from the layer 4 to be blocked.
Specifically, placing the back-off packer 5 into the casing 2 comprises:
the back-off packer 5 is placed into the casing 2 through the back-off string.
When the releasing packer 5 reaches the upper part of the plugging layer 3, the setting releasing packer is pressed to seal the releasing packer 5 with the sleeve 2, and the high-pressure resistant releasing packer 5 is ensured to separate the sleeve at the position of the plugging layer 3 from the sleeve above the high-pressure resistant releasing packer 5.
The releasing packer 5 is anchored on the inner wall of the casing 2 through a slip, and the releasing packer 5 is firmly connected with the casing 2.
When the sealing of the releasing packer 5 is finished, the releasing string is released, and the releasing string is prevented from interfering the subsequent plugging process.
In this embodiment, the back-off packer 5 is fixedly disposed on the inner wall of the casing 2. Wherein, the releasing packer 5 can be a high pressure resistant large drift diameter releasing packer.
Specifically, cementing the plugging layer 3 includes:
and (3) penetrating the extrusion plugging pipe column 6 through the releasing packer 5 to the bottom of the plugging layer 3, and cementing. And the plugging layer 3 is cemented by adopting the extrusion plugging pipe column 6, so that the operation is convenient.
Specifically, sealing the packer 5, and pressurizing the cement in the plugging layer 3 includes:
and a sealing mandrel 7 is arranged on the extrusion plugging pipe column 6.
And lifting the pressing blocking pipe column 6 to enable the sealing mandrel 7 on the pressing blocking pipe column 6 to reach the central pipe of the releasing packer 5, and sealing.
The cement in the plugging layer 3 is pressurized by extruding the plugging pipe column 6, so that the cement enters the oil layer of the plugging layer 3.
And when the pressurization is finished, the extrusion blocking pipe column 6 is lifted out.
In the present embodiment, the entry of cement into the oil layer of the plugging layer 3 includes:
the casing 2 is provided with a plurality of perforations.
When the cement between the releasing packer 5 and the layer 4 to be plugged is pressurized by the extrusion plugging pipe column 6, the cement enters the oil layer of the plugging layer 3 through the perforation, and the plugging of the plugging layer 3 is ensured to be complete.
In the embodiment, when the cement in the plugging layer 3 is solidified, the extrusion plugging pipe column 6 is pulled out, so that the extrusion plugging pipe column 6 is prevented from interfering with the subsequent processes.
Specifically, after the cement in the plugging layer 3 is solidified, the safety abandoned well plugging method further comprises the following steps:
a reamer bit is lowered into the casing 2.
The cement solidified at the plugging layer 3 in the sleeve 2 is ground by the reaming bit, and pressure test is carried out to test whether the solidified cement at the plugging layer 3 meets the requirements.
Specifically, opening the plugging layer 3 and waiting for the plugging layer 4 includes:
and when the pressure test is qualified, drilling the cement plug 1 through the reaming bit.
When the cement plug 1 is drilled through, the reaming bit is lifted out to plug the layer 4 to be plugged.
In the embodiment, when the layer 4 to be plugged is plugged, the extrusion plugging pipe column 6 sequentially passes through the releasing packer 5 and the plugging layer 3 to reach the bottom of the layer 4 to be plugged, and cement is injected. By pressurizing the cement in the layer to be plugged 4 by the extrusion plugging pipe column 6, the cement enters the oil layer of the layer to be plugged 4 through the perforation, and the plugging of the layer to be plugged 4 is ensured to be complete. When the cement in the layer 4 to be plugged is solidified, the extrusion plugging pipe column 6 is pulled out, and the extrusion plugging pipe column 6 is prevented from interfering the subsequent processes.
Specifically, when the plugging of the layer 4 to be plugged is finished, the releasing packer 5 is lifted out, and the plugging process is completed.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A safe abandoned well plugging method is characterized by comprising the following steps:
separating a plugging layer and a layer to be plugged in the sleeve;
placing a releasing packer into the casing and setting the releasing packer above the plugging layer;
cementing the plugging layer;
sealing the releasing packer, and pressurizing cement in the plugging layer to enable the cement to enter an oil layer of the plugging layer;
and after the cement in the blocking layer is solidified, opening the blocking layer and the layer to be blocked, and blocking the layer to be blocked.
2. The method of plugging a safety abandoned well according to claim 1, wherein the step of separating the plugging layer from the layer to be plugged inside the casing comprises:
and putting a cement plug into the sleeve, and arranging the cement plug between the blocking layer and the layer to be blocked.
3. The method of plugging a safety abandoned well according to claim 2, wherein:
the cement plug is arranged 5-10 meters below the plugging layer.
4. The method of safely abandoning well plugging according to claim 1, wherein the placing of the packer into the casing comprises:
placing the releasing packer into the casing through a releasing string;
and when the releasing packer reaches the upper part of the plugging layer, pressing the setting releasing packer to seal the releasing packer with the casing.
5. The safety abandoned well plugging method according to claim 4, wherein:
the releasing packer is anchored on the inner wall of the casing through slips;
and when the sealing of the releasing packer is finished, the releasing tubular column is taken out.
6. The method of plugging a safety abandoned well according to claim 1 wherein the cementing of the plugging layer comprises:
and (4) penetrating the extruded plugging pipe column through the releasing packer to the bottom of the plugging layer, and performing cementing.
7. The method of safely abandoning well plugging according to claim 6, wherein the sealing a packer and pressurizing cement within the plugging layer comprises:
a sealing mandrel is arranged on the extrusion plugging pipe column;
lifting the extrusion blocking pipe column to enable a sealing mandrel on the extrusion blocking pipe column to reach the central pipe of the releasing packer and sealing;
pressurizing cement in the plugging layer through the extrusion plugging pipe column so that the cement enters an oil layer of the plugging layer;
and when the pressurization is finished, the extrusion blocking pipe column is taken out.
8. The safety abandoned well plugging method of claim 1, wherein after the cement in the plugging layer sets, the safety abandoned well plugging method further comprises:
running a reamer bit into the casing;
and grinding the cement solidified at the plugging layer in the sleeve by the reaming bit, and performing pressure test.
9. The method of plugging a safety abandoned well according to claim 8, wherein said opening a plugging layer with said layer to be plugged comprises:
when the pressure test is qualified, drilling the cement plug through the reaming bit;
pulling out the reamer bit while the cement plug is drilled through;
and plugging the layer to be plugged.
10. The safety abandoned well plugging method according to claim 1, wherein:
and when the plugging of the layer to be plugged is finished, the releasing packer is lifted out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110773244.3A CN115596395A (en) | 2021-07-08 | 2021-07-08 | Safe abandoned well plugging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110773244.3A CN115596395A (en) | 2021-07-08 | 2021-07-08 | Safe abandoned well plugging method |
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| Publication Number | Publication Date |
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| CN115596395A true CN115596395A (en) | 2023-01-13 |
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| CN202110773244.3A Pending CN115596395A (en) | 2021-07-08 | 2021-07-08 | Safe abandoned well plugging method |
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Citations (6)
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|---|---|---|---|---|
| CN1456785A (en) * | 2003-05-30 | 2003-11-19 | 中国石化胜利油田有限公司采油工艺研究院 | Selective multi-stage inner pipe cementing process and cemented tubular column there from |
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2021
- 2021-07-08 CN CN202110773244.3A patent/CN115596395A/en active Pending
Patent Citations (6)
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