CN111425174B - Thermal concentric layered electric ignition process pipe column - Google Patents
Thermal concentric layered electric ignition process pipe column Download PDFInfo
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- CN111425174B CN111425174B CN201910018244.5A CN201910018244A CN111425174B CN 111425174 B CN111425174 B CN 111425174B CN 201910018244 A CN201910018244 A CN 201910018244A CN 111425174 B CN111425174 B CN 111425174B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 111
- 239000007924 injection Substances 0.000 claims abstract description 111
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000004873 anchoring Methods 0.000 claims abstract description 9
- 238000003780 insertion Methods 0.000 claims abstract description 9
- 230000037431 insertion Effects 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 85
- 239000010410 layer Substances 0.000 description 51
- 239000003921 oil Substances 0.000 description 43
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003434 inspiratory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a thermal concentric layered electric ignition process pipe column, which comprises an outer pipe column and an inner pipe column; the outer pipe column is sequentially provided with an anchoring device, a first thermal fire-flooding packer, an air injection valve, an insertion sealing device, a heat insulation pipe, an upper-layer air injection sliding sleeve, a second thermal fire-flooding packer, a lower-layer air injection sliding sleeve and a plug from top to bottom; the upper gas injection sliding sleeve corresponds to the position of an upper oil layer, and the lower gas injection sliding sleeve corresponds to the position of a lower oil layer; the inner pipe string sequentially comprises an oil pipe releaser, an oil pipe and a sealed inner pipe from top to bottom; the sealing inner pipe is inserted in the inserting sealing device in a sealing mode. The thermal concentric layered electric ignition process tubular column can realize layered ignition and layered gas injection of the fireflood, improve the longitudinal use condition of a fireflood oil layer and solve the problem of uneven gas injection.
Description
Technical Field
The invention relates to an oil well fire flooding production process pipe column, in particular to a thermal concentric layered electric ignition process pipe column.
Background
Fire flooding is also called in-situ combustion, and specifically refers to an oil extraction method in which the temperature of an oil layer reaches the ignition point of crude oil by using electric and chemical methods, and air or oxygen is injected into the oil layer to continuously combust the crude oil in the oil layer. In the process of fire flooding development, oil reservoirs have great difference in longitudinal exploitation degree, air suction of each layer is uneven, a single-layer plunging phenomenon exists, the difficulty in improving air injection parameters of the gas injection well is high, the production well shows that a high part of the structure takes effect firstly, a low part of the structure takes effect later, and the problems of nonuniform effect and plunging phenomenon exist. The results of monitoring the inspiratory profile show that: the overall usage level of the fireflood reaches 75%, but the usage conditions in the longitudinal direction are greatly different. In order to improve the longitudinal utilization condition of the fire flooding oil layer and solve the problem of uneven gas injection, research and field tests of a fire flooding layered gas injection technology are needed to be carried out so as to realize relatively uniform gas injection of a gas injection well and improve the fire flooding development effect. The layered fireflood is characterized in that a development target layer is artificially layered on the basis of a conventional fireflood, layered fireflood development is realized, and the key point for ensuring the layered fireflood development effect is successful ignition and gas injection of each layer so as to form a stable combustion front edge and realize smooth displacement of underground crude oil.
The key of successful fire flooding is the success of oil layer ignition, and the electric ignition technology can obtain higher ignition temperature through an electric heater, is suitable for an oil well with higher oil layer combustion threshold temperature, but single-well electric ignition at the present stage is limited by a tubular column structure, and only single-layer ignition and single-layer quantitative gas injection can be performed. The multilayer ignition and multilayer respectively quantitative gas injection cannot be realized at the present stage.
Therefore, the inventor provides a thermal concentric layered electric ignition process pipe column by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a thermal concentric layered electric ignition process pipe column to realize layered ignition and layered gas injection of a fire-flooding oil layer, improve the longitudinal utilization condition of the fire-flooding oil layer and solve the problem of uneven gas injection.
The invention aims to realize the purpose, and the thermal concentric layered electric ignition process tubular column comprises an outer tubular column and an inner tubular column which can be arranged in the outer tubular column in a penetrating way; the outer pipe string is arranged in the shaft;
the outer pipe column is sequentially provided with an anchoring device, a first thermal fire-flooding packer, an air injection valve, an insertion sealing device, a heat insulation pipe, an upper-layer air injection sliding sleeve, a second thermal fire-flooding packer, a lower-layer air injection sliding sleeve and a plug from top to bottom; the upper gas injection sliding sleeve corresponds to the position of an upper oil layer, and the lower gas injection sliding sleeve corresponds to the position of a lower oil layer;
the inner pipe string sequentially comprises an oil pipe releaser, an oil pipe and a sealed inner pipe from top to bottom; the sealing inner pipe is inserted in the inserting sealing device in a sealing mode.
In a preferred embodiment of the present invention, the insertion sealing device includes a first upper joint, a first stepped hole having a diameter larger than an inner diameter of the first upper joint is formed at an inner side of a lower portion of the first upper joint, and a first stepped portion having a diameter smaller than an outer diameter of the first upper joint is formed at an outer side of the lower portion of the first upper joint; the outer wall of the first step part is provided with a section of upward retaining ring groove, and the upward retaining ring groove is formed by tightly arranging a plurality of circles of sawtooth-shaped ring grooves; a locking ring is sleeved on the outer wall of the first step part, and the inner wall surface of the locking ring is provided with a backstop ring tooth correspondingly matched with the upward backstop ring groove; a second step hole and a third step hole with successively larger apertures are formed in the upward inner wall surface of the upper part of the first lower joint; the third stepped hole is fixedly connected with the outer wall of the first upper joint in a sealing manner, and an annular accommodating space is formed between the hole bottom of the third stepped hole and the bottom of the first upper joint; a lining ring is arranged at the bottom of the second stepped hole, the inner diameter of the lining ring is the same as that of the first lower joint, and the inner side of the lining ring is connected with a first lining pipe through a first shearing pin; a sliding sleeve capable of sliding along the wall of the third step hole is arranged in the annular accommodating space, the outer wall of the sliding sleeve extends upwards to form a section of upper sleeve body, the inner wall of the sliding sleeve extends downwards to form a section of lower sleeve body, the upper sleeve body is fixed on the first step part through a second shearing pin, and the upper sleeve body is sleeved on the outer side of the locking ring and fixed with the locking ring through a screw; the lower sleeve body is arranged between the outer wall of the first liner tube and the inner wall of the second stepped hole, and a first rubber sealing element is arranged between the bottom end of the upper sleeve body and the top end of the liner ring; the inner wall of the sliding sleeve is also fixedly provided with a first central tube, and the top end of the first central tube is abutted against the hole shoulder of the first stepped hole; the inner diameter of the top end of the first central pipe is smaller than that of the first upper joint; the sealing inner pipe comprises a second central pipe, and a sand control pipe is fixedly connected below the second central pipe; the side arm at the lower part of the sand control pipe is provided with a sieve pore; the outer diameter of the sand control pipe is larger than the inner diameter of the first liner pipe and smaller than the inner diameter of the top end of the first central pipe; the outer diameter of the second center tube is smaller than the inner diameter of the first upper joint and larger than the inner diameter of the top end of the first center tube.
In a preferred embodiment of the present invention, a second rubber sealing element is disposed between the inner wall of the third step hole and the outer wall of the first upper joint.
In a preferred embodiment of the present invention, the upper gas injection sliding sleeve includes an outer sleeve, an upper end of the outer sleeve is connected to a lower end of the second upper joint through an internal thread, and a lower end of the outer sleeve is connected to an upper end of the second lower joint through an internal thread; a plurality of first gas injection holes are formed in the circumferential direction of the side wall of the outer sleeve; a fourth stepped hole with the diameter larger than the inner diameter of the outer sleeve is arranged at the upper end of the inner wall surface of the outer sleeve, and an upward annular retaining shoulder is formed between the fourth stepped hole and the inner wall surface of the outer sleeve; a supporting sleeve is sleeved on the inner side of the outer sleeve, a sleeve body is sleeved on the outer wall of the supporting sleeve, the sleeve body is fixedly connected to the supporting sleeve through a third shearing pin, the sleeve body is arranged at the fourth stepped hole, an annular retaining shoulder is supported on the bottom surface of the sleeve body, and a plurality of second gas injection holes which are correspondingly communicated with the first gas injection holes are formed in the circumferential direction of the side wall of the supporting sleeve; a fifth stepped hole and a sixth stepped hole which are sequentially increased in diameter are formed in the inner wall of the lower portion of the second upper joint from top to bottom; the upper part of the support sleeve is arranged in the fifth stepped hole in a penetrating mode, the outer diameter of the upper part of the support sleeve is the same as the aperture of the fifth stepped hole, and the inner diameter of the support sleeve is the same as the inner diameter of the second upper joint and the inner diameter of the second lower joint; the outer wall of the upper part of the supporting sleeve is provided with a ring of annular grooves, the annular grooves are circumferentially and symmetrically provided with two through holes, the inner wall of the upper part of the supporting sleeve is sleeved with a second liner tube, the outer wall surface of the second liner tube is provided with a sunk groove corresponding to the through holes, the positions corresponding to the two through holes are respectively provided with a locking block, each locking block is arranged in the annular groove, the top of each locking block is flush with the top of the annular groove, and the lower parts of the locking blocks penetrate through the corresponding through holes and are clamped in the corresponding sunk grooves; an annular block withdrawing space is formed between the outer wall of the upper part of the support sleeve and the sixth stepped hole.
In a preferred embodiment of the present invention, an annular sealing gasket is respectively disposed at the threaded connection positions of the second upper joint and the second lower joint and the outer sleeve 1.
In a preferred embodiment of the present invention, a seventh stepped hole with a diameter that is enlarged is upwardly formed on an inner wall of an upper portion of the second lower joint, and the diameter of the seventh stepped hole is the same as the outer diameter of the support sleeve; the distance between the step part of the seventh stepped hole and the bottom end of the support sleeve is greater than the axial distance between the locking block and the annular withdrawing block space.
In a preferred embodiment of the present invention, the inner wall of the upper end of the second upper joint is provided with an internal thread for connecting an upper pipe; the outer wall of the lower end of the second lower joint is provided with an external thread used for connecting a pipe fitting below.
In a preferred embodiment of the present invention, the lower gas injection sliding sleeve includes an outer layer tube, a plurality of third gas injection holes are circumferentially formed on a tube wall of the outer layer tube, and an inner layer tube is sleeved on an inner side of the outer layer tube and is fixedly connected to the outer layer tube by fourth shear pins; the inner pipe covers the inner side of the third gas injection hole.
In a preferred embodiment of the present invention, a connecting tube is disposed at the bottom end of the outer tube.
From the above, the thermal concentric layered electric ignition process tubular column can ensure that the upper oil layer and the lower oil layer are in two different gas injection systems, and the problem of uneven gas suction caused by different gas injection amount of the lower stratum of the same gas injection system is solved; the layered ignition and layered gas injection in the fire flooding can be realized, the longitudinal use condition of a fire flooding oil layer is improved, and the problem of uneven gas injection is solved. The sealing performance of the pipe column can be ensured in the construction process, and normal-temperature air is injected into the pipe column all the time; the steel wire operation is more convenient, faster and more economical than the modes of a continuous oil pipe and the like.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is a structural schematic diagram of the thermal concentric layered electric ignition process pipe column.
FIG. 2: is a structural schematic diagram of the insertion sealing device in the invention.
FIG. 3: is a structural schematic diagram of the middle and upper layer gas injection sliding sleeve.
FIG. 4 is a schematic view of the structure of the outer tube of the present invention.
FIG. 5 is a schematic structural view of a second upper joint according to the present invention.
FIG. 6 is a schematic view of the structure of the second lower joint of the present invention.
FIG. 7 is a schematic structural view of the support sleeve of the present invention.
FIG. 8 is a schematic view of the second liner of the present invention.
FIG. 9 is a schematic view of the lock block of the present invention.
FIG. 10 is a schematic structural view of the lower gas injection sliding sleeve according to the present invention.
Reference numerals:
100. an upper gas injection sliding sleeve;
1. an outer sleeve;
11. a first gas injection hole;
12. a fourth stepped hole;
121. an annular shoulder;
2. a second upper joint;
21. a fifth stepped hole;
22. a sixth stepped hole;
3. a second lower joint;
31. a seventh stepped bore;
4. a support sleeve;
41. a second gas injection hole;
42. a ring groove;
421. through holes;
5. a ferrule body;
51. a third shear pin;
6. a second liner;
61. sinking a groove;
7. a locking block;
8. an annular block withdrawing space;
9. an annular seal;
200. a lower gas injection sliding sleeve;
201. an outer tube;
2011. a third gas injection hole;
202. an inner layer tube;
203. a fourth shear pin;
204. a connecting pipe;
300. inserting a sealing device;
301. a first upper joint;
3011. a first stepped hole;
3012. a first step portion;
30121. an upward stopping ring groove;
302. locking a ring;
303. a first lower joint;
3031. a second stepped bore;
3032. a third stepped bore;
304. a liner ring;
3041. a first shear pin;
305. a first liner tube;
306. a sliding sleeve;
3061. an upper sleeve body;
30611. a second shear pin;
30612. a screw;
3062. a lower sleeve body;
307. a first rubber seal;
308. a first center tube;
309. a second rubber seal;
310. a compression nut;
400. sealing the inner tube;
401. a second center tube;
402. a sand control pipe;
4021. screening holes;
901. an anchoring device;
902. a first thermal fireflood packer;
903. an air injection valve;
904. a heat insulating pipe;
905. a second thermal fireflood packer;
906. plugging with a thread;
907. an oil pipe releaser;
908. an oil pipe;
909. an upper oil layer;
910. and a lower oil layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise indicated, all references to up and down directions herein are to the same extent as the references to up and down directions in FIG. 1 shown in the present application and described herein.
As shown in fig. 1, the present invention provides a thermal concentric layered electric ignition process pipe column, which comprises an outer pipe column and an inner pipe column capable of penetrating through the outer pipe column; the outer pipe string is arranged in the shaft;
the outer pipe column is sequentially provided with an anchoring device 901, a first thermal type fireflood packer 902, a gas injection valve 903, an insertion sealing device 300, a heat insulation pipe 904, an upper gas injection sliding sleeve 100, a second thermal type fireflood packer 905, a lower gas injection sliding sleeve 200 and a plug 906 from top to bottom; the upper gas injection sliding sleeve 100 corresponds to the upper oil layer 909, and the lower gas injection sliding sleeve 200 corresponds to the lower oil layer 910;
the inner pipe string comprises an oil pipe releaser 907, an oil pipe 908 and a sealed inner pipe 400 from top to bottom in sequence; the sealing inner tube 400 is sealingly inserted in the insertion sealing device 300.
The use mode of the thermal concentric layered electric ignition process pipe column is described as follows:
1. connecting the process pipe columns according to the structural sequence, and sequentially setting the outer pipe columns; an anchoring device 901 in the outer pipe column is a high-temperature resistant split anchoring device, and a special extension pipe and an oil pipe for fireflooding can be connected above the anchoring device 901; and lifting and lowering the mechanical setting high-temperature-resistant split anchoring device. The gas injection valve 903 is in an open state.
2. Sequentially setting the inner pipe column again according to the structural sequence; at this time, the upper gas injection sliding sleeve 100 is in an open state (normally open state), and the lower gas injection sliding sleeve 200 is in a closed state (normally closed state).
3. The sealing inner pipe 400 is inserted into the insertion sealing device 300 and compressed by the weight of the inner pipe string, ensuring that the inner and outer pipe string walls are in a sealed state.
4. An electric igniter is lowered along the inner tubular string to the position of the first thermal fireflood packer 902 (the first thermal fireflood packer 902 is prior art), and the first thermal fireflood packer 902 is heated and set, so that the tightness between the outer tubular string and the wellbore casing is ensured.
5. Then, an electric igniter is put down along the inner pipe column to the position of the upper gas injection sliding sleeve 100, and meanwhile, normal temperature air is injected from the inner pipe column. The normal temperature air is heated by the electric igniter in the heat insulation pipe 904 and becomes high temperature air which can reach 500 ℃ at most. The heated air enters the upper oil layer 909 through the upper gas injection sliding sleeve 100, and the electric ignition construction of the upper oil layer 909 is realized. While the hot air also heats the lower second thermal fireflood packer 905 for setting (this second thermal fireflood packer 905 is prior art).
6. Providing an electric igniter; the air injection of the inner pipe column is stopped, normal temperature air is injected into an annular space (a sandwiched wall) between the inner pipe column and the outer pipe column instead, and the normal temperature air enters the upper oil layer 909 through the air injection valve 903, so that the continuous combustion of the upper oil layer 909 is ensured.
7. A steel wire operation tool is put in, and the lowest end of the steel wire is connected with a sliding sleeve reversing impact head; the impact head is used to close the upper gas injection sliding sleeve 100 while the lower gas injection sliding sleeve 200 is opened. The wireline tool is then presented. At this time, the upper gas injection sliding sleeve 100 is in a closed state, and the lower gas injection sliding sleeve 200 is in an open state.
8. And then, an electric igniter is put into the lower gas injection sliding sleeve 200 along the inner pipe column, and normal-temperature air is injected from the inner pipe column again, and is heated by the electric igniter in the heat insulation pipe 904, so that the normal-temperature air is changed into high-temperature air which can reach 500 ℃ at most. Heated air enters the lower oil layer 910 from the lower gas injection sliding sleeve 200, and electric ignition construction of the lower oil layer 910 is achieved.
9. Finally, an electric igniter is proposed.
From the above, the thermal concentric layered electric ignition process tubular column can ensure that the upper oil layer and the lower oil layer are in two different gas injection systems, and the problem of uneven gas suction caused by different gas injection amount of the lower stratum of the same gas injection system is solved; the layered ignition and layered gas injection in the fire flooding can be realized, the longitudinal use condition of a fire flooding oil layer is improved, and the problem of uneven gas injection is solved. The sealing performance of the pipe column can be ensured in the construction process, and normal-temperature air is injected into the pipe column all the time; the steel wire operation is more convenient, faster and more economical than the modes of a continuous oil pipe and the like.
The thermal concentric layered electric ignition process pipe column has the following advantages:
1. need not the water injection, inner tube tubular column tool cluster reduces, all puts the sealing member of gas injection sliding sleeve and interior outer tube on outer tube tubular column, and the easier construction.
2. The heat insulation pipe is arranged on the outer pipe column, and the size is abundant below the inner pipe column, so that heat can be collected by the electric igniter better, and the ignition effect is ensured.
3. The inner pipe column does not need to be impacted when being put down, and the stability and the safety of the upper gas injection sliding sleeve can be more reliably ensured.
4. More reasonable size and structure have guaranteed the effective air injection cross-section of upper portion oil reservoir and lower part oil reservoir respectively, the air injection volume in the assurance oil reservoir that can be abundant.
Further, as shown in fig. 2, in the present embodiment, the insertion sealing device 300 includes a first upper joint 301, a first stepped hole 3011 having a diameter larger than the inner diameter of the first upper joint 301 is formed inside the lower portion of the first upper joint 301, and a first stepped portion 3012 having a diameter smaller than the outer diameter of the first upper joint 301 is formed outside the lower portion of the first upper joint 301; the outer wall of the first step part 3012 is provided with a section of upward stopping ring slot 30121, and the upward stopping ring slot 30121 is formed by tightly arranging a plurality of circles of sawtooth-shaped ring slots; a locking ring 302 is sleeved on the outer wall of the first step part 3012, and the inner wall surface of the locking ring 302 is provided with a backstop ring tooth correspondingly matched with the upward backstop ring groove 30121; a second stepped hole 3031 and a third stepped hole 3032 with successively larger aperture diameters are arranged on the inner wall surface of the upper part of the first lower joint 303; the third stepped hole 3032 is fixedly connected with the outer wall of the first upper joint 301 in a sealing manner, and an annular accommodating space is formed between the bottom of the third stepped hole 3032 and the bottom of the first upper joint 301; a liner ring 304 is arranged at the bottom of the second stepped hole 3031, the inner diameter of the liner ring 304 is the same as that of the first lower joint 303, and the inner side of the liner ring 304 is connected with a first liner pipe 305 through a first shearing pin 3041; a sliding sleeve 306 capable of sliding along the wall of the third stepped hole 3032 is arranged in the annular accommodating space, a section of upper sleeve 3061 extends upwards from the outer wall of the sliding sleeve 306, a section of lower sleeve 3062 extends downwards from the inner wall of the sliding sleeve 306, the upper sleeve 3061 is fixed on the first stepped part 3012 through a second shearing pin 30611, and the upper sleeve 3061 is sleeved on the outer side of the locking ring 302 and fixed with the locking ring 302 through a screw 30612; the lower sleeve 3062 is arranged between the outer wall of the first liner pipe 305 and the inner wall of the second stepped hole 3031, and a first rubber sealing element 307 is arranged between the bottom end of the upper sleeve 3061 and the top end of the lining ring 304; a first central tube 308 is further fixedly arranged on the inner wall of the sliding sleeve 306, and the top end of the first central tube 308 abuts against a hole shoulder of the first stepped hole 3011; the inner diameter of the top end of the first center pipe 308 is smaller than that of the first upper joint 301; the sealed inner pipe 400 comprises a second base pipe 401, and a sand control pipe 402 is fixedly connected below the second base pipe 401; a side arm at the lower part of the sand control pipe 402 is provided with a sieve hole 4021; the outer diameter of the sand control pipe 402 is greater than the inner diameter of the first liner 305 and less than the inner diameter of the top end of the first base pipe 308; the outer diameter of the second center tube 401 is smaller than the inner diameter of the first top sub 301 and larger than the inner diameter of the top end of the first center tube 308. A second rubber sealing element 309 is arranged between the inner wall of the third stepped hole 3032 and the outer wall of the first upper joint 301; a compression nut 310 is sleeved on the outer wall of the first upper joint 301 above the second rubber sealing element 309, and the inner wall of the third stepped hole 3032 is in threaded connection with the outer wall of the compression nut 310. As shown in fig. 2, the sliding sleeve 306 can be assembled from multiple parts.
When the inner sealing pipe 400 is inserted into the sealing device 300, the bottom of the sand control pipe 402 first contacts with the top end of the first liner pipe 305, and the downward pressure shears the first shear pin 3041 and pushes the first liner pipe 305 downward, at this time, the upper pipe wall of the sand control pipe 402 is located inside the first rubber sealing element 307 (i.e. at the position of the original first liner pipe 305), the inner sealing pipe 400 is further lowered, so that the bottom of the second base pipe 401 contacts with the top of the first base pipe 308 and drives the first base pipe 308 to move downward, at this point, the first base pipe 308 drives the sliding sleeve 306 to move downward, the lower sleeve 3062 of the sliding sleeve 306 presses the first rubber sealing element 307 downward, the first rubber sealing element 307 expands and deforms, and the inside of the first rubber sealing element 307 contacts with and seals the upper pipe wall of the sand control pipe 402 (the upper pipe wall is not provided with the sieve mesh 4021); meanwhile, the upper sleeve 3061 of the sliding sleeve 306 moves downwards and shears the second shearing pin 30611, when the upper sleeve 3061 moves downwards, the locking ring 302 is driven to move downwards through the screw 30612, and the locking ring 302 is enabled to climb downwards along the upward stopping ring groove 30121 on the outer wall of the first step part 3012; after the inner pipe 400 stops being lowered, the upward retaining ring groove 30121 is matched with the retaining ring teeth of the locking ring 302, the sliding sleeve 306 cannot move upward, the first rubber sealing element 307 which is extruded and deformed cannot recover, and the upper pipe wall of the sand control pipe 402 which seals the inner pipe can be continuously contacted and sealed with the first rubber sealing element 307, so that stable sealing between the inner pipe column and the outer pipe column can be maintained.
Further, as shown in fig. 3 to 9, in the present embodiment, the upper layer gas injection sliding sleeve 100 includes an outer sleeve 1, an upper end of the outer sleeve 1 is connected with a lower end of the second upper joint 2 through an internal thread, and a lower end of the outer sleeve 1 is connected with an upper end of the second lower joint 3 through an internal thread; a plurality of first gas injection holes 11 are formed in the circumferential direction of the side wall of the outer sleeve 1; a fourth stepped hole 12 with a diameter larger than the inner diameter of the outer sleeve 1 is arranged at the upper end of the inner wall surface of the outer sleeve 1, and an upward annular retaining shoulder 121 is formed between the fourth stepped hole 12 and the inner wall surface of the outer sleeve 1; a supporting sleeve 4 is sleeved on the inner side of the outer sleeve 1, a sleeve body 5 is sleeved on the outer wall of the supporting sleeve 4, the sleeve body 5 is fixedly connected to the supporting sleeve 4 through a third shearing pin 51, in the embodiment, two third shearing pins 51 are symmetrically arranged along the circumferential direction of the sleeve body 5, the sleeve body 5 is arranged at a fourth stepped hole 12, an annular blocking shoulder 121 is supported on the bottom surface of the sleeve body 5, and a plurality of second gas injection holes 41 which are communicated with the first gas injection holes 11 are circumferentially arranged on the side wall of the supporting sleeve 4; a fifth stepped hole 21 and a sixth stepped hole 22 with successively larger hole diameters are formed in the inner wall of the lower part of the second upper joint 2 from top to bottom; the upper part of the support sleeve 4 is arranged in the fifth stepped hole 21 in a penetrating mode, the outer diameter of the upper part of the support sleeve 4 is the same as the diameter of the fifth stepped hole 21, and the inner diameter of the support sleeve 4 is the same as the inner diameter of the second upper connector 2 and the inner diameter of the second lower connector 3; the outer wall of the upper part of the support sleeve 4 is provided with a ring of ring grooves 42, the ring grooves 42 are circumferentially and symmetrically provided with two through holes 421, the inner wall of the upper part of the support sleeve 4 is sleeved with a second liner tube 6, the outer wall surface of the second liner tube 6 is correspondingly provided with a sunk groove 61 with the through holes 421, the positions corresponding to the two through holes 421 are respectively provided with a locking block 7, each locking block 7 is arranged in the ring groove 42, the top of the locking block 7 is flush with the top of the ring groove 42, and the lower part of the locking block 7 penetrates through the corresponding through hole 421 and is clamped in the corresponding sunk groove 61, so that the second liner tube 6 is clamped and positioned on the inner wall surface of the support sleeve 4; an annular block withdrawing space 8 is formed between the outer wall of the upper part of the support sleeve 4 and the sixth stepped hole 22.
The upper gas injection sliding sleeve 100 is a normally open gas injection sliding sleeve, when the gas injection sliding sleeve is used in a well, the second liner pipe 6 is connected with the support sleeve 4 through the locking block 7, the weight of the second liner pipe is completely hung on the third shear pin 51 of the sleeve body 5, the upper gas injection sliding sleeve 100 is in an open state at the moment, and fire-flooding high-temperature air enters an upper oil layer 909 through the second gas injection hole 41 of the support sleeve 4 and the first gas injection hole 11 of the outer sleeve 1; when the upper gas injection sliding sleeve 100 needs to be closed, the second liner pipe 6 is impacted by a sliding sleeve opening and closing tool (the sliding sleeve opening and closing tool is a special operation construction tool for the sliding sleeve, and is a prior art, such as a steel wire operation tool), the third shearing pin 51 is sheared by the impact force, the second liner pipe 6 moves downwards together with the support sleeve 4 through the locking block 7, the second gas injection hole 41 is staggered with the first gas injection hole 11, the gas injection sliding sleeve is closed, the annular block retreating space 8 is designed in the second upper joint 2, after the support sleeve 4 drives the locking block 7 to move downwards to a certain distance, the locking block 7 enters the annular block retreating space 8, the clamping state of the second liner pipe 6 and the support sleeve 4 is released, the second liner pipe 6 falls, the inner diameter is released, and the operation space of other oil layers is ensured. The structure of the locking block 7 ensures that the locking block cannot fall into the well to cause well blocking (the second liner tube 6 falls to the plug below the pipe column and cannot block the well).
Further, in the present embodiment, an annular gasket 9 is respectively disposed at the threaded connection positions of the second upper joint 2 and the second lower joint 3 and the outer sleeve 1.
The upper-layer gas injection sliding sleeve adopts a locking block structure, so that the sliding sleeve is easy to close, the locking block cannot fall into a well, and the condition that claw spring parts in the prior art fail at high temperature is avoided; the upper gas injection sliding sleeve adopts an all-metal structure, and has higher temperature resistance level and working temperature; the metal end face sealing gasket is adopted, and has higher failure temperature and working temperature than rubber and temperature-resistant rubber sealing rings (the temperature-resistant rubber sealing ring has sealing failure at about 200 ℃, and a red copper end face sealing element adopted by the upper-layer gas injection sliding sleeve can resist the high temperature of 550 ℃); and the gas injection at the threaded joint is ensured without leakage.
In the present embodiment, a seventh stepped hole 31 with a diameter that is enlarged is formed upward on the inner wall of the upper portion of the second lower joint 3, and the diameter of the seventh stepped hole 31 is the same as the outer diameter of the support sleeve 4; the distance t between the step of the seventh stepped hole 31 and the bottom end of the support sleeve 4 is greater than the axial distance s between the lock block 7 and the annular block withdrawing space 8, so that the second gas injection hole 41 of the support sleeve 4 and the first gas injection hole 11 of the outer sleeve 1 are ensured to be closed relatively, and the lock block 7 can be positioned at the position of the annular block withdrawing space 8.
The inner wall of the upper end of the second upper joint 2 is provided with an internal thread for connecting an upper pipe fitting; the outer wall of the lower end of the second lower joint 3 is provided with an external thread used for connecting a lower pipe fitting.
As shown in fig. 10, the lower gas injection sliding sleeve 200 of the present invention includes an outer layer pipe 201, a plurality of third gas injection holes 2011 are circumferentially formed on a pipe wall of the outer layer pipe 201, and an inner layer pipe 202 is sleeved on an inner side of the outer layer pipe 201 and is fixedly connected to the outer layer pipe 201 by a fourth shear pin 203; the inner tube 202 is shielded inside the third gas injection hole 2011, and a connecting tube 204 is further disposed at the bottom end of the outer tube 201.
The lower gas injection sliding sleeve 200 is a normally closed gas injection sliding sleeve, when the lower gas injection sliding sleeve 200 needs to be opened, the outer layer pipe 201 is impacted through the steel wire operation tool string, the fourth shearing pin 203 is sheared by the impact force, the outer layer pipe 201 falls to the lower side and does not shield the third gas injection hole 2011, and the lower gas injection sliding sleeve 200 is opened and injects gas to the lower oil layer 910.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (8)
1. A thermal concentric layered electric ignition process pipe column is characterized by comprising an outer pipe column and an inner pipe column which can be arranged in the outer pipe column in a penetrating way; the outer pipe string is arranged in the shaft;
the outer pipe column is sequentially provided with an anchoring device, a first thermal fire-flooding packer, an air injection valve, an insertion sealing device, a heat insulation pipe, an upper-layer air injection sliding sleeve, a second thermal fire-flooding packer, a lower-layer air injection sliding sleeve and a plug from top to bottom; the upper gas injection sliding sleeve corresponds to the position of an upper oil layer, and the lower gas injection sliding sleeve corresponds to the position of a lower oil layer;
the inner pipe string sequentially comprises an oil pipe releaser, an oil pipe and a sealed inner pipe from top to bottom; the sealing inner pipe is inserted in the inserting sealing device in a sealing mode;
the upper-layer gas injection sliding sleeve comprises an outer sleeve, the upper end of the outer sleeve is connected with the lower end of the second upper connector through internal threads, and the lower end of the outer sleeve is connected with the upper end of the second lower connector through internal threads; a plurality of first gas injection holes are formed in the circumferential direction of the side wall of the outer sleeve; a fourth stepped hole with the diameter larger than the inner diameter of the outer sleeve is arranged at the upper end of the inner wall surface of the outer sleeve, and an upward annular retaining shoulder is formed between the fourth stepped hole and the inner wall surface of the outer sleeve; the supporting sleeve is sleeved on the inner side of the outer sleeve, the outer wall of the supporting sleeve is sleeved with the sleeve ring body, the sleeve ring body is fixedly connected onto the supporting sleeve through a third shearing pin, the sleeve ring body is arranged at the fourth stepped hole, the annular retaining shoulder is supported on the bottom surface of the sleeve ring body, and a plurality of second gas injection holes which are communicated with the first gas injection holes are formed in the circumferential direction of the side wall of the supporting sleeve; a fifth stepped hole and a sixth stepped hole which are sequentially increased in diameter are formed in the inner wall of the lower portion of the second upper joint from top to bottom; the upper part of the support sleeve is arranged in the fifth stepped hole in a penetrating mode, the outer diameter of the upper part of the support sleeve is the same as the aperture of the fifth stepped hole, and the inner diameter of the support sleeve is the same as the inner diameter of the second upper joint and the inner diameter of the second lower joint; the outer wall of the upper part of the supporting sleeve is provided with a ring of annular grooves, the annular grooves are circumferentially and symmetrically provided with two through holes, the inner wall of the upper part of the supporting sleeve is sleeved with a second liner tube, the outer wall surface of the second liner tube is provided with a sunken groove corresponding to the through holes, the positions corresponding to the two through holes are respectively provided with a locking block, each locking block is arranged in the annular groove, the top of each locking block is flush with the top of the annular groove, and the lower parts of the locking blocks penetrate through the corresponding through holes and are clamped in the corresponding sunken grooves; an annular block withdrawing space is formed between the outer wall of the upper part of the support sleeve and the sixth stepped hole.
2. The thermal concentric layered electric ignition process cartridge of claim 1, wherein the insert sealing means comprises a first upper joint having a first stepped hole with a diameter larger than the inner diameter of the first upper joint formed on the inner side of the lower portion of the first upper joint, and a first stepped portion with a diameter smaller than the outer diameter of the first upper joint formed on the outer side of the lower portion of the first upper joint; the outer wall of the first step part is provided with a section of upward retaining ring groove, and the upward retaining ring groove is formed by tightly arranging a plurality of circles of sawtooth-shaped ring grooves; the locking ring is sleeved on the outer wall of the first step part, and the inner wall surface of the locking ring is provided with a backstop ring tooth correspondingly matched with the upward backstop ring groove; a second stepped hole and a third stepped hole with successively larger apertures are formed in the upper inner wall surface of the first lower joint upwards; the third stepped hole is fixedly connected with the outer wall of the first upper joint in a sealing manner, and an annular accommodating space is formed between the hole bottom of the third stepped hole and the bottom of the first upper joint; the lining ring is arranged at the bottom of the second stepped hole, the inner diameter of the lining ring is the same as that of the first lower joint, and the inner side of the lining ring is connected with a first lining pipe through a first shearing pin; a sliding sleeve capable of sliding along the wall of the third step hole is arranged in the annular accommodating space, the outer wall of the sliding sleeve extends upwards to form a section of upper sleeve body, the inner wall of the sliding sleeve extends downwards to form a section of lower sleeve body, the upper sleeve body is fixed on the first step part through a second shearing pin, and the upper sleeve body is sleeved on the outer side of the locking ring and fixed with the locking ring through a screw; the lower sleeve body is arranged between the outer wall of the first liner tube and the inner wall of the second stepped hole, and a first rubber sealing element is arranged between the bottom end of the upper sleeve body and the top end of the liner ring; the inner wall of the sliding sleeve is also fixedly provided with a first central tube, and the top end of the first central tube is abutted against the hole shoulder of the first stepped hole; the inner diameter of the top end of the first central pipe is smaller than that of the first upper joint; the sealing inner pipe comprises a second central pipe, and a sand control pipe is fixedly connected below the second central pipe; the side arm at the lower part of the sand control pipe is provided with a sieve pore; the outer diameter of the sand control pipe is larger than the inner diameter of the first liner pipe and smaller than the inner diameter of the top end of the first central pipe; the outer diameter of the second center tube is smaller than the inner diameter of the first upper joint and larger than the inner diameter of the top end of the first center tube.
3. The thermal concentric layered electrical ignition process cartridge of claim 2, wherein a second rubber seal is disposed between the inner wall of the third stepped bore and the outer wall of the first top sub.
4. The thermal concentric layered electric ignition process column of claim 1, wherein the threaded connections of the second upper joint and the second lower joint with the outer sleeve are provided with annular gaskets.
5. The thermal concentric layered electric ignition process column of claim 4, wherein the inner wall of the upper portion of the second lower joint is upwardly provided with a seventh stepped hole with an enlarged diameter, and the diameter of the seventh stepped hole is the same as the outer diameter of the support sleeve; the distance between the step part of the seventh stepped hole and the bottom end of the support sleeve is greater than the axial distance between the locking block and the annular withdrawing block space.
6. The thermal concentric layered electrical ignition process cartridge of claim 1, wherein the inner wall of the upper end of the second upper connector is provided with internal threads for connecting an upper pipe fitting; the outer wall of the lower end of the second lower joint is provided with an external thread used for connecting a pipe fitting below.
7. The thermal concentric layered electrical ignition process tube column of claim 1, wherein the lower gas injection sliding sleeve comprises an outer layer tube, the wall of the outer layer tube is circumferentially provided with a plurality of third gas injection holes, and the inner layer tube is sleeved on the inner side of the outer layer tube and is fixedly connected to the outer layer tube by fourth shear pins; the inner pipe covers the inner side of the third gas injection hole.
8. The thermal concentric layered electrical ignition process cartridge of claim 7, wherein the bottom end of the outer tube is provided with a connecting tube.
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| CN114198076B (en) * | 2021-11-26 | 2024-05-10 | 中国石油天然气股份有限公司 | Multi-layer fireflood injection pipe column and ignition method thereof |
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