CN112324415A - Combined segmented reconstruction method for selective repeated reconstruction of old well - Google Patents
Combined segmented reconstruction method for selective repeated reconstruction of old well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012856 packing Methods 0.000 claims abstract description 58
- 230000009466 transformation Effects 0.000 claims abstract description 26
- 238000005488 sandblasting Methods 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000012986 modification Methods 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 238000002715 modification method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010276 construction Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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Abstract
The invention provides a joint sectional reconstruction method for selective repeated reconstruction of an old well, which comprises the following specific steps: firstly, connecting a coiled tubing with a packing string, then lowering the coiled tubing to a preset position of a target reservoir, ensuring that each packer blocks the original reservoir and a new reservoir transformation section, and avoiding casing joint hoops; pumping soluble ball seats with corresponding specifications at the releasing and connecting back barrel, and setting a packer of a packing string and a packer of a packing reservoir stratum when the soluble ball seats are pressed to 20 Mpa; when the pressure is increased to 30Mpa, the releasing and connecting cylinder releases the releasing and connecting cylinder, and the part above the releasing and connecting cylinder is lifted out; thirdly, a fracturing pipe column is put in, and hydraulic sand blasting perforation and annular fracturing transformation are carried out on the new reservoir; and determining a modification method for the original reservoir according to the condition. The invention realizes effective packing of the original modified reservoir by using the upper packer and the lower packer, avoids fracturing fluid from leaking into the original fracture, and improves the repeated modification effect. After the transformation is completed, the packing pipe column can be pulled out in the later stage according to the requirement, the optical sleeve can be kept, and the transformation once more is facilitated.
Description
Technical Field
The invention relates to the technical field of underground operation of oil field exploration and development, in particular to a joint segmented reconstruction method for selective repeated reconstruction of an old well, and specifically belongs to the technical field of repeated fracturing of an oil and gas field.
Background
After a period of time of fracturing well completion production of the low permeability oil and gas well, the fracture conductivity is gradually reduced. In order to improve the single-well yield of the oil-gas field and excavate the production potential of the oil-gas well, an old well which has part of main stratum sand body development, good reservoir physical properties and excellent reservoir forming conditions but has poorer production dynamics than an adjacent well is selected to carry out repeated fracturing modification. Different from the reconstruction of a new well, the old well has the defects that due to long-term production, the stratum energy of a near wellbore zone is deficient, and in the process of repeatedly fracturing the old well, if the original modified reservoir is not effectively sealed, fracturing fluid leaks into the original fracture, so that the old well not only causes secondary damage to the reservoir, but also has low liquid fracture-making efficiency and limited fracture extension distance and cannot reach the target of expected reconstruction. Meanwhile, for some old wells, after a period of production, cracks of a part of reservoir near the well are blocked, the yield gradually decreases, and measures are needed to be taken for blocking removal; and if the water producing reservoir is not effectively sealed, the oil-gas well is subjected to early flooding even if the water producing reservoir is repeatedly reformed, and the overall yield of the oil-gas well is seriously influenced.
At present, repeated transformation of old wells of oil and gas well fields in Changqing oil fields is mostly limited to the adoption of a low-damage temporary plugging agent to prevent the loss of fracturing fluid, but the application effect is not obvious, and the practical problem cannot be effectively solved.
Disclosure of Invention
In order to overcome the problems that the yield of the existing old well is reduced and the reconstruction effect is not ideal through a temporary plugging agent, the invention provides a combined segmented reconstruction method for selective and repeated reconstruction of the old well.
The technical scheme adopted by the invention is as follows:
a combined sectional reconstruction method for selective repeated reconstruction of an old well comprises the following specific steps:
firstly, connecting a coiled tubing with a packing string, then lowering the coiled tubing to a preset position of a target reservoir, ensuring that each packer blocks the original reservoir and a new reservoir transformation section, and avoiding casing joint hoops;
pumping soluble ball seats with corresponding specifications at the releasing and connecting back barrel, and setting a packer of a packing string and a packer of a packing reservoir stratum when the soluble ball seats are pressed to 20 Mpa; when the pressure is increased to 30Mpa, the releasing and connecting cylinder releases the releasing and connecting cylinder, and the part above the releasing and connecting cylinder is lifted out;
thirdly, a fracturing pipe column is put in, and hydraulic sand blasting perforation and annular fracturing transformation are carried out on the new reservoir; determining a modification method for an original reservoir according to conditions;
after the transformation is completed, the fracturing string is pulled out, the oil pipe connecting sealing insertion pipe is inserted into the releasing tieback cylinder, and the oil pipe head is hung on a well mouth to be used as a production string;
and step five, if the packer string needs to be pulled out in the later stage, only an oil pipe needs to be lifted from the well mouth, all the packers are unsealed, and after the packer string is pulled out, the shaft is the optical sleeve.
In the third step, the concrete steps of carrying out hydraulic sand blasting perforation and annular fracturing reconstruction on the new reservoir stratum are as follows: and injecting perforating fluid from the continuous oil pipe, performing hydraulic sand blasting perforation, and injecting fracturing fluid from the oil sleeve annulus after perforation is completed, wherein the continuous oil pipe keeps injection.
In the third step, the original reservoir transformation conditions are as follows:
firstly, judging the water production of an original reservoir, and plugging a flow passage from a sleeve to an oil pipe by using a packer of a packing string without modification;
secondly, judging that the original reservoir does not produce water, but a near wellbore region is blocked, and performing hydraulic sand blasting perforation and secondary annular fracturing transformation on the reservoir;
and thirdly, judging that the original reservoir does not produce water and the oil and gas yield is normal, performing hydraulic sand blasting perforation on the reservoir only, and opening a liquid flow channel from the casing to the oil pipe.
And fifthly, lifting the packer to 8-10T, and unsealing all the packers.
The fracturing string comprises a coiled tubing and a bottom seal fracturing drilling tool, the bottom seal fracturing drilling tool at least comprises an ejector and a coiled tubing bottom packer, the coiled tubing is connected with the ejector through a safety joint, and the ejector is connected with the coiled tubing bottom packer.
The packing string consists of a releasing and connecting cylinder, a packing string packer, an oil pipe, a plurality of packing reservoir packers and a guide sieve pipe which are sequentially connected from top to bottom, wherein the plurality of packing reservoir packers are connected through oil pipe short sections.
The packer for packing the reservoir is Y341 packer, and the packer for packing the tubular column is Y441 packer.
The setting mode of the packing string packer and the packing reservoir packer is force: the pressure is increased to 15-20 Mpa, and the setting force of a packer for packing a tubular column and a plurality of packers for packing a reservoir stratum from top to bottom is reduced by 0.5 Mpa-1 Mpa in sequence from the wellhead to the bottom of the well; the deblocking method comprises the following steps: the lifting force reaches 8-10T.
The invention has the beneficial effects that:
1. before the fracturing string is put into the fracturing string, the packing string is put into the fracturing string, and after the packer is set, the upper packer and the lower packer are utilized to realize effective packing of an original modified reservoir stratum in the fracturing process, so that the fracturing fluid is prevented from leaking into an original fracture, and the repeated modification effect is improved.
2. The fracturing method of the invention is to inject fracturing fluid from the oil sleeve annulus, the coiled tubing keeps low discharge capacity accompanied injection, and the construction discharge capacity can reach 6m3More than min, the repeated modification scale can be enlarged, and the crack extension distance can be prolonged.
3. The invention can selectively open the original reservoir flow channel by using the upper and lower packers for plugging, and for the reservoir which does not produce water, the plugging of the near wellbore zone is judged, and then the hydraulic sand-blasting perforation and the secondary annular fracturing reformation are carried out on the reservoir; judging that the original reservoir does not produce water and the oil and gas yield is normal, only performing hydraulic sand-blasting perforation on the reservoir, opening a liquid flow channel from the casing to the oil pipe, and not influencing the original yield; and for a water producing reservoir, the water plugging effect is realized by utilizing an upper packer and a lower packer without any transformation.
4. After the reconstruction is completed, the packing pipe column can be pulled out at the later stage according to the requirement, the optical sleeve can be kept, and the reconstruction is facilitated.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figures, the reference numbers are: 1. a sleeve; 2. A coiled tubing; 3. a releasing tieback cylinder; 4. a packer; 5. an oil pipe; 6. bottom seal fracturing drilling tools; 7. a first packer for packing the oil pipe; 8. A second packer for packing the oil pipe; 9. a third packer for packing the oil pipe; 10. a packer IV for packing the oil pipe; 11. a fifth packer for packing the oil pipe; 12. the screen is guided.
Detailed Description
Example 1:
in order to overcome the problems that the yield of the existing old well is reduced and the reconstruction effect of the temporary plugging agent is not ideal, the invention provides a combined segmented reconstruction method for selective repeated reconstruction of the old well as shown in figure 1.
A combined sectional reconstruction method for selective repeated reconstruction of an old well comprises the following specific steps:
firstly, connecting a coiled tubing 2 with a packing string and then putting the string to a preset position of a target reservoir, ensuring that each packer blocks the original reservoir and a new reservoir transformation section, and avoiding casing joint hoops;
pumping soluble ball seats with corresponding specifications to fall on the releasing and connecting back barrel 3, and setting the packer 4 of the packing string and the packer of the packing reservoir when the pressure is increased to 20 Mpa; when the pressure is increased to 30Mpa, the releasing tieback cylinder 3 releases the releasing and the part above the releasing tieback cylinder 3 is lifted out;
thirdly, a fracturing pipe column is put in, and hydraulic sand blasting perforation and annular fracturing transformation are carried out on the new reservoir; determining a modification method for an original reservoir according to conditions;
fourthly, after the reformation is completed, the fracturing string is pulled out, the oil pipe connecting sealing insertion pipe is inserted into the releasing tieback cylinder 3, and the oil pipe head is hung on a well mouth to be used as a production string;
and step five, if the packer string needs to be pulled out in the later stage, only an oil pipe needs to be lifted from the well mouth, all the packers are unsealed, and after the packer string is pulled out, the shaft is the optical sleeve.
Before the fracturing string is put into the fracturing string, the packing string is put into the fracturing string, and after the packer is set, the upper packer and the lower packer are utilized to realize effective packing of an original modified reservoir stratum in the fracturing process, so that the fracturing fluid is prevented from leaking into an original fracture, and the repeated modification effect is improved. The invention can selectively open the original reservoir flow channel by using the upper and lower packers for plugging, and for the reservoir which does not produce water, the plugging of the near wellbore zone is judged, and then the hydraulic sand-blasting perforation and the secondary annular fracturing reformation are carried out on the reservoir; judging that the original reservoir does not produce water and the oil and gas yield is normal, only performing hydraulic sand-blasting perforation on the reservoir, opening a liquid flow channel from the casing to the oil pipe, and not influencing the original yield; and for a water producing reservoir, the water plugging effect is realized by utilizing an upper packer and a lower packer without any transformation.
After the reconstruction is completed, the packing pipe column can be pulled out at the later stage according to the requirement, the optical sleeve can be kept, and the reconstruction is facilitated. The fracturing method of the invention is that the secondary oil sleeveThe fracturing fluid is injected into the annular space, the coiled tubing keeps low discharge capacity and injection, and the construction discharge capacity can reach 6m3More than min, the repeated modification scale can be enlarged, and the crack extension distance can be prolonged.
Example 2:
based on embodiment 1, in this embodiment, preferably, in the third step, the specific steps of performing hydraulic sand blasting perforation and annular fracturing reformation on the new reservoir stratum include: and injecting perforating fluid from the continuous oil pipe 2, performing hydraulic sand blasting perforation, and after the perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the continuous oil pipe 2 in the process of injection.
Preferably, in the third step, the original reservoir transformation condition is as follows:
firstly, judging the water production of an original reservoir, and blocking a liquid flow channel from a sleeve 1 to an oil pipe 5 by using a packer 4 of a packing string without modification;
secondly, judging that the original reservoir does not produce water, but a near wellbore region is blocked, and performing hydraulic sand blasting perforation and secondary annular fracturing transformation on the reservoir;
and thirdly, judging that the original reservoir does not produce water and the oil and gas yield is normal, performing hydraulic sand blasting perforation on the reservoir only, and opening a liquid flow channel from the casing 1 to the oil pipe 5.
Preferably, in the fifth step, the lifting force reaches 8-10T, and all the packers are unset.
Preferably, the fracturing string comprises a coiled tubing 2 and a bottom seal fracturing drilling tool, the bottom seal fracturing drilling tool at least comprises an ejector and a coiled tubing bottom packer, the coiled tubing 2 is connected with the ejector through a safety joint, and the ejector is connected with the coiled tubing bottom packer.
Preferably, the packing string consists of a release tieback cylinder 3, a packing string packer 4, an oil pipe 5, a plurality of packing reservoir packers and a guide sieve tube 12 which are sequentially connected from top to bottom, and the plurality of packing reservoir packers are connected through oil pipe short joints.
The fracturing string and the fracturing fluid are both in the prior art, and further description is not provided in the invention.
Preferably, the packer for the packing reservoir is a Y341 packer, and the packer string 4 is a Y441 packer.
The setting mode of the packer string packer 4 and the packer reservoir layer packer is force: the pressure is increased to 15-20 Mpa, and the setting force of a string packer 4 and a plurality of packer reservoir packers is reduced by 0.5 Mpa-1 Mpa from top to bottom in the direction from the well mouth to the well bottom; the deblocking method comprises the following steps: the lifting force reaches 8-10T.
In the invention, the length of the oil pipe 5 is determined according to the depth of a construction oil-gas well and the depth of a producing zone. After the packer tubular column is put in and set for releasing, the fracturing tubular column is used for carrying out fracturing operation on a designed reservoir stratum, perforating or fracturing operation is carried out on an original water-producing reservoir stratum, the fracturing tubular column is taken out, the oil inlet pipe is connected with the sealing insertion pipe and is inserted into the releasing tieback cylinder to be taken as a production tubular column, and the packer tubular column can be taken out at the later stage according to requirements.
Example 3:
based on the embodiment 1 or 2, in this embodiment, 2-stage repeated reconstruction is performed on the original 3 stages of reservoirs (assuming that the original reservoir i produces water, the original reservoir ii is fractured in a zone near the wellbore, and the original reservoir iii produces normal oil and gas) to explain the fracturing method. The method is characterized by comprising the following steps:
(1) the oil pipe is connected with a packing pipe column and is put down to a preset position of a target reservoir, the original reservoir and the position of a new reservoir transformation section are guaranteed to be clamped by an upper packer and a lower packer, and casing joint hoops are avoided;
(2) pumping a soluble ball seat with corresponding specification to fall on the releasing and connecting barrel 3, and setting a Y441 packer 4, a first packer 7 of a packing reservoir stratum, a second packer 8 of a packing reservoir stratum, a third packer 9 of the packing reservoir stratum, a fourth packer 10 of the packing reservoir stratum and a fifth packer 11 of the packing reservoir stratum when the soluble ball seat is pressurized to 20 Mpa; when the pressure is increased to 30Mpa, the releasing tieback cylinder 3 releases the releasing and the part above the releasing tieback cylinder 3 is lifted out;
(3) a fracturing pipe column is put in, and because the original reservoir I produces water, the original reservoir I does not need to be reformed; drag coiled tubing 2 will aim at I departments of new reservoir bed to end seal fracturing drilling tool 6, carry out hydraulic sand blasting perforation, annular space fracturing transformation: and injecting perforating fluid from the coiled tubing, and performing hydraulic sand blasting perforation. After perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping low-displacement accompanied injection of the continuous oil pipe; after the new reservoir stratum I is transformed, lifting the fracturing string to the original reservoir stratum II for hydraulic sand blasting perforation and annular fracturing transformation; after the original reservoir II is transformed, lifting the fracturing string to a new reservoir II for hydraulic sand blasting perforation and annular fracturing transformation; and after the new reservoir II is transformed, lifting the fracturing pipe column to the original reservoir III, and performing hydraulic sand blasting perforation.
(4) And (5) after the reservoir is completely transformed, pulling out the fracturing string. Because the well needs I original reservoir stratum to produce water, the lower oil pipe is connected with the sealing insertion pipe and inserted into the releasing and returning cylinder 3, and the oil pipe head is hung on the well mouth to be used as a production pipe column.
(5) In the later production stage, when the packer string needs to be pulled out, only the oil pipe needs to be lifted from the well mouth, and after the lifting force reaches 10T, the Y441 packers 4 and the Y341 packers 7, 8, 9, 10 and 11 are respectively deblocked, so that the packer string is pulled out.
The method comprises the steps of connecting a packing string through an oil pipe, placing the packing string at a preset position of a target reservoir, pumping a soluble ball setting packer with a specified specification, realizing packing of an original reservoir and a new reservoir reconstruction section, then placing the packing string into a fracturing string for gradual reconstruction, pulling out the fracturing string after the reconstruction is finished, and placing the fracturing string into a production string. The invention realizes effective packing of the original modified reservoir by using the upper packer and the lower packer, avoids fracturing fluid from leaking into the original fracture, and improves the repeated modification effect. For a new reservoir, the construction displacement can reach 6m3More than min, the repeated modification scale can be enlarged, and the crack extension distance can be prolonged. For the original reservoir, the liquid flow channel can be selectively opened according to the requirement. After the transformation is completed, the packing pipe column can be pulled out in the later stage according to the requirement, the optical sleeve can be kept, and the transformation once more is facilitated.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The apparatus structure and the method steps thereof, which are not described in detail in the present invention, are prior art and will not be further described in the present invention.
Claims (8)
1. A joint sectional reconstruction method for selective repeated reconstruction of an old well is characterized by comprising the following steps: the method comprises the following specific steps:
firstly, connecting a coiled tubing (2) with a packing string and then putting the coiled tubing to a preset position of a target reservoir, ensuring that each packer blocks the original reservoir and the position of a new reservoir transformation section, and avoiding casing joint hoops;
pumping soluble ball seats with corresponding specifications at the releasing and connecting back barrel (3), and setting a packer of a packing string (4) and a packer of a packing reservoir stratum when the soluble ball seats are pressed to 20 Mpa; when the pressure is increased to 30Mpa, the releasing and connecting cylinder (3) releases the releasing and connecting cylinder, and the part above the releasing and connecting cylinder (3) is lifted;
thirdly, a fracturing pipe column is put in, and hydraulic sand blasting perforation and annular fracturing transformation are carried out on the new reservoir; determining a modification method for an original reservoir according to conditions;
fourthly, after the reformation is completed, the fracturing string is pulled out, the oil pipe connecting sealing insertion pipe is inserted into the releasing tieback cylinder (3), and the oil pipe head is hung on a well mouth to be used as a production string;
and step five, if the packer string needs to be pulled out in the later stage, only an oil pipe needs to be lifted from the well mouth, all the packers are unsealed, and after the packer string is pulled out, the shaft is the optical sleeve.
2. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: in the third step, the concrete steps of carrying out hydraulic sand blasting perforation and annular fracturing reconstruction on the new reservoir stratum are as follows: and injecting perforating fluid from the coiled tubing (2), performing hydraulic sand blasting perforation, and after the perforation is finished, injecting fracturing fluid from the annular space of the oil sleeve, and simultaneously keeping the coiled tubing (2) in concomitant injection.
3. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: in the third step, the original reservoir transformation conditions are as follows:
firstly, judging the water production of an original reservoir, and plugging a liquid flow channel from a sleeve (1) to an oil pipe (5) by using a packer (4) of a packing pipe column without modification;
secondly, judging that the original reservoir does not produce water, but a near wellbore region is blocked, and performing hydraulic sand blasting perforation and secondary annular fracturing transformation on the reservoir;
and thirdly, judging that the original reservoir does not produce water and the oil and gas yield is normal, performing hydraulic sand blasting perforation on the reservoir only, and opening a liquid flow channel from the casing (1) to the oil pipe (5).
4. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: and fifthly, lifting the packer to 8-10T, and unsealing all the packers.
5. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: the fracturing string comprises a coiled tubing (2) and a bottom seal fracturing drilling tool, the bottom seal fracturing drilling tool at least comprises an ejector and a coiled tubing bottom packer, the coiled tubing (2) is connected with the ejector through a safety joint, and the ejector is connected with the coiled tubing bottom packer.
6. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: the packer tubular column consists of a releasing and connecting sleeve (3), a packer tubular column packer (4), an oil pipe (5), a plurality of packer reservoir layer packers and a guide sieve tube (12) which are sequentially connected from top to bottom, and the packer reservoir layer packers are connected through oil pipe short sections.
7. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: the packer for packing the reservoir is Y341 packer, and the packer tubular column packer (4) is Y441 packer.
8. The selective re-engineering combined staged reconstruction method for old wells according to claim 1, characterized in that: the setting mode of the packing string packer (4) and the packing reservoir packer is force: the pressure is increased to 15-20 Mpa, and the setting force of a string packer (4) and a plurality of packer reservoir packers is reduced by 0.5 Mpa-1 Mpa from top to bottom in the direction from the well mouth to the well bottom; the deblocking method comprises the following steps: the lifting force reaches 8-10T.
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| CN112324415B (en) | 2023-04-07 |
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