CN116446827A - Self-adjustable bottom filling tool - Google Patents
Self-adjustable bottom filling tool Download PDFInfo
- Publication number
- CN116446827A CN116446827A CN202310714151.2A CN202310714151A CN116446827A CN 116446827 A CN116446827 A CN 116446827A CN 202310714151 A CN202310714151 A CN 202310714151A CN 116446827 A CN116446827 A CN 116446827A
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- Prior art keywords
- filling
- cylinder
- nipple
- service
- pipe column
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- 238000007789 sealing Methods 0.000 claims abstract description 65
- 210000002445 nipple Anatomy 0.000 claims abstract description 38
- 239000004576 sand Substances 0.000 claims abstract description 7
- 230000002265 prevention Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims 3
- 241001330002 Bambuseae Species 0.000 claims 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 3
- 239000011425 bamboo Substances 0.000 claims 3
- 230000006978 adaptation Effects 0.000 claims 2
- 238000010276 construction Methods 0.000 description 27
- 238000011001 backwashing Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000012856 packing Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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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)
- Geophysics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of downhole operation tools of oil and gas wells, in particular to a self-adjustable bottom filling tool, which comprises an outer pipe column and an inner pipe column, wherein the inner pipe column comprises an upper joint, an inner supporting cylinder, a service nipple and a service filling pipe which are sequentially connected from top to bottom, the outer pipe column comprises a signal cylinder, a sand prevention nipple, an upper connecting cylinder, an upper connecting nipple, a switch cylinder, a lower connecting nipple, a lower connecting cylinder, a filling nipple and a guide plug which are sequentially connected from top to bottom, the bottom of the switch cylinder is connected with a sealing plate sleeve, the bottom of the sealing plate sleeve is elastically hinged with a sealing plate for closing an inner hole of the sealing plate sleeve, the filling nipple is provided with a filling hole, and the inner pipe column is movably connected in the inner cavity of the outer pipe column.
Description
Technical Field
The invention relates to the technical field of downhole operation tools for oil and gas wells, in particular to a self-adjustable bottom filling tool.
Background
With further deepening of oilfield development, the continuous increase of exploitation difficulty, sand production of a horizontal oil well has gradually become a main problem in the oilfield development and production process, and the traditional bottom filling construction of the horizontal well has two construction processes;
firstly, two pipe columns are adopted for operation, namely, a well-leaving pipe column is firstly put into a well, then a packer is set, a service pipe column of the packer is put into a filling service pipe column again after being lifted, the whole construction process is time-consuming and labor-consuming, especially a deep well with a depth of nearly kilometers or even exceeding kilometers, and the construction period and the construction difficulty are higher;
the second type adopts a pipe column to be matched with a regulator or an adjusting pup joint for operation, and because the regulator or the adjusting pup joint is complex in construction and material preparation, the wellhead is complex in operation, the construction difficulty is extremely high, misoperation is easy to occur, and the regulator or the adjusting pup joint is hardly used in deep well construction at present.
Therefore, the inventor wants to design a tool capable of improving the deep well construction efficiency and reducing the deep well construction difficulty.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a self-adjustable bottom filling tool which can be used for lowering an outer pipe column and an inner pipe column into a well by adopting one-pass pipe column in construction, and completing filling operation and backwashing operation by matching the outer pipe column with the inner pipe column, so that the deep well construction working efficiency is improved, and the deep well construction working difficulty is reduced.
The technical scheme of the invention is as follows: a self-adjustable bottom filling tool comprises an outer tubular column and an inner tubular column;
the inner pipe column comprises an upper joint, an inner supporting cylinder, a service nipple and a service filling pipe which are sequentially connected from top to bottom;
the outer pipe column comprises a signal cylinder, a sand prevention nipple, an upper connecting cylinder, an upper connecting nipple, a switch cylinder, a lower connecting nipple, a lower connecting cylinder, a filling nipple and a guide plug which are sequentially connected from top to bottom, the bottom of the switch cylinder is connected with a sealing plate sleeve, the bottom of the sealing plate sleeve is elastically hinged with a sealing plate for closing an inner hole of the sealing plate sleeve, and a filling hole is formed in the filling nipple;
the inner pipe column is movably connected in the inner cavity of the outer pipe column, pushes the sealing plate away through the bottom of the service filling pipe, and is then inserted into the filling nipple so that the service filling pipe is communicated with the filling hole;
an annular first step in sliding sealing fit with the upper joint is arranged on the inner wall of the signal cylinder, an annular second step in sliding sealing fit with the lower end of the service filling pipe is arranged on the inner wall of the lower connecting cylinder, and the inner diameter of the annular second step is smaller than that of the annular first step;
the upper end of the outer wall of the service filling pipe is provided with an outer step, the inner wall of the upper connecting cylinder is provided with an inner step matched with the outer step to support the service filling pipe, and a sealing ring group matched with the service filling pipe in a sliding sealing manner is arranged below the inner step in the upper connecting cylinder.
Preferably, the top of the inner support cylinder is connected in the cavity of the upper joint, the bottom of the inner support cylinder is provided with a reducing step, and a part of the inner support cylinder between the reducing step and the upper joint is sleeved with a signal sleeve;
the outer diameter of the signal sleeve is matched with the inner diameter of the annular first step, the top and the bottom of the signal sleeve are respectively provided with a closing-in step matched with the outer diameter of the inner supporting cylinder, the inner supporting cylinder is supported by the closing-in step to form a deformation gap between the middle part of the signal sleeve and the inner supporting cylinder, the middle part of the signal sleeve is a group of elastic strip structures which are arranged in a surrounding mode, and the outer wall of each elastic strip structure is provided with supporting steps with trapezoid cross sections.
Preferably, the lower end of the inner wall of the upper connecting cylinder is connected with a fastening ring in a threaded manner, and the sealing ring set is fixed in the cavity of the upper connecting cylinder through the cooperation of the fastening ring and the inner step.
Preferably, the opening at the top of the sealing ring set is in a horn-shaped structure with an upward opening.
Preferably, the switch cylinders are a plurality of switch cylinders which are axially arranged, and two adjacent switch cylinders are connected through a middle nipple.
Preferably, the filling holes are a plurality of the filling nipple walls which are circumferentially arranged at intervals.
Preferably, the sealing ring group comprises a rubber sealing ring and metal sealing rings symmetrically distributed on two sides of the rubber sealing ring.
Preferably, the bottom of the service filling pipe penetrates out of the annular second step, and the penetrating length part is used as the allowance for the up-and-down movement of the service filling pipe.
Compared with the prior art, the invention has the following advantages:
the invention has simple and reasonable structure, adopts one pipe column to lower the outer pipe column and the inner pipe column into the well in construction, and completes filling operation and backwashing operation through common operation of the outer pipe column and the inner pipe column, thereby improving the working efficiency and reducing the working difficulty.
In particular, when some deep wells are operated at nearly kilometers or even over kilometers, the construction difficulty of the deep wells is greatly reduced, the construction efficiency is improved, and compared with the prior art of adopting two-pass pipe column construction or regulator type tools for construction, the construction process and matched operation equipment are greatly simplified, so that the barriers of complex deep well construction and low success rate are broken through.
Through annular first step and annular second step at outside tubular column internal design, respectively with the upper and lower both ends cooperation to inside tubular column, can play sliding seal complex effect, can play again to the effect of righting inside tubular column.
When the inner pipe column is lowered, the signal sleeve penetrates into the signal cylinder, the signal prompt effect is achieved by utilizing the change of the lowering resistance, the position of the signal sleeve reaching the signal cylinder is judged, the signal sleeve is continuously lowered, the lowering resistance is changed again, and therefore the signal sleeve is prompted to reach the design position after being compressed inwards, and then the signal sleeve passes through the signal cylinder.
Drawings
FIG. 1 is a schematic diagram of the upper structure of the present invention;
FIG. 2 is a schematic view of the lower structure of the present invention;
FIG. 3 is a schematic view of the structure of the inner column;
FIG. 4 is a schematic upper structural view of an outer tubular string;
FIG. 5 is a schematic view of the lower structure of the outer string;
FIG. 6 is a schematic diagram of the structure of a signal sleeve;
in the figure: 1. the device comprises a signal cylinder, 2, an upper joint, 3, an inner supporting cylinder, 4, a signal sleeve, 5, a sand prevention nipple, 6, a service nipple, 7, an upper connecting cylinder, 8, a sealing ring group, 9, a fastening ring, 10, an upper connecting nipple, 11, a service filling pipe, 12, a switch cylinder, 13, a sealing plate sleeve, 14, a middle nipple, 15, an annular first step, 16, an outer step, 17, an inner step, 18, a sealing plate, 19, a lower connecting nipple, 20, a lower connecting cylinder, 21, a filling nipple, 22, a filling hole, 23, a guide screw plug, 24, an annular second step, 25, a deformation gap, 26, a supporting step, 27, a reducing step, 28, a closing step, 29 and an elastic strip structure.
Detailed Description
The invention is further illustrated by the following examples in connection with the accompanying drawings.
Example 1
Referring to fig. 1 and 2, a self-adjusting bottom-filling tool includes an outer string and an inner string.
As shown in fig. 3, the inner tubular string comprises an upper joint 2, an inner support barrel 3, a service nipple 6 and a service filling pipe 11 which are connected in sequence from top to bottom.
As shown in fig. 4 and 5, the outer tubular string comprises a signal tube 1, a sand prevention nipple 5, an upper connecting tube 7, an upper connecting nipple 10, a switch tube 12, a lower connecting nipple 19, a lower connecting tube 20, a filling nipple 21 and a guide plug 23 which are sequentially connected from top to bottom.
The bottom of the switch cylinder 12 is connected with a sealing plate sleeve 13, a sealing plate 18 for closing an inner hole of the sealing plate sleeve 13 is elastically hinged to the bottom of the sealing plate sleeve 13, and a filling hole 22 is formed in a filling nipple 21.
The inner pipe column is movably connected in the inner cavity of the outer pipe column, when the inner pipe column is inserted into the outer pipe column for matching, the bottom of the service filling pipe 11 pushes the sealing plate 18 away, the sealing plate 18 is turned down and opened, and then the service filling pipe 11 is inserted into the filling nipple 21, so that the service filling pipe 11 is communicated with the filling hole 22.
The inner wall of the signal cylinder 1 is provided with an annular first step 15 in sliding sealing fit with the upper joint 2, the inner wall of the lower connecting cylinder 20 is provided with an annular second step 24 in sliding sealing fit with the lower end of the service filling pipe 11, and the inner diameter of the annular second step 24 is smaller than that of the annular first step 15.
An outer step 16 is arranged at the upper end of the outer wall of the service filling pipe 11, an inner step 17 matched with the outer step 16 for supporting the service filling pipe 11 is arranged on the inner wall of the upper connecting cylinder 7, and a sealing ring group 8 matched with the service filling pipe 11 in a sliding sealing manner is arranged below the inner step 17 in the upper connecting cylinder 7.
Working principle:
filling operation: firstly, connecting a signal cylinder 1 with an upper screen pipe column, installing a packer on the upper screen pipe column, and then lowering the packer to a wellhead position together;
and then the upper joint 2 is connected below the service pipe column of the packer, so that the inner pipe column can be lifted up and lowered down along with the service pipe column of the packer, and then the device is lowered into the casing pipe according to the operation rules of underground operation until reaching the designed depth at constant speed.
After reaching the design depth, the packer is set and then a packing operation is performed, during which packing fluid is delivered downwardly through the interior chamber of the inner string and then flows into the packing location through the packing bore 22.
Backwashing: after the filling operation is finished, the service filling pipe 11 can be lifted up, the bottom pipe orifice of the service filling pipe 11 reaches the position in the sand control nipple 5, at the moment, an annular flow channel is formed between the service filling pipe 11 and the annular first step 15 of the signal cylinder 1, during the backwashing operation, backwashing liquid flows into the inner cavity of the outer pipe column through the annular flow channel and then flows back to the ground through the service filling pipe 11, gravel in the upper cavity of the outer pipe column and gravel in the inner pipe column return to the wellhead along with the backwashing liquid in the whole flowing process, thereby finishing backwashing operation, and finally lifting the inner pipe column out of the wellhead and taking the outer pipe column as a well-leaving part.
In addition, the support to the sealing plate 18 is released in the lifting process of the inner pipe column, the sealing plate 18 is turned upwards under the action of elasticity to close the inner hole of the sealing plate sleeve 13, so that the filling channel at the bottom of the outer pipe column is closed, wherein fig. 1 and 2 show the sealing plate 18 in an open state, and fig. 4 and 5 show the sealing plate 18 in a closed state.
The invention has simple and reasonable structure, can adopt one pipe column to lower the outer pipe column and the inner pipe column into the well in construction, and can finish filling operation and backwashing operation through common operation of the outer pipe column and the inner pipe column, thereby improving the working efficiency and reducing the working difficulty.
In particular, when some deep wells are operated at nearly kilometers or even over kilometers, the construction difficulty of the deep wells is greatly reduced, the construction efficiency is improved, and compared with the prior art of two-pass pipe column construction or regulator type tool construction, the construction process and matched operation equipment are greatly simplified, so that the barriers of complex deep well construction and low success rate are broken through.
Through the annular first step 15 and the annular second step 24 which are designed in the outer pipe column respectively match with the upper end and the lower end of the inner pipe column, the effect of sliding seal matching can be achieved, and the effect of righting the inner pipe column can be achieved.
Example 2
The embodiment is further optimized based on the embodiment, and specifically comprises the following steps:
the top of the inner support cylinder 3 is connected in the cavity of the upper joint 2, the bottom of the inner support cylinder 3 is provided with a reducing step 27, and a part of the inner support cylinder 3 between the reducing step 27 and the upper joint 2 is sleeved with a signal sleeve 4.
As shown in fig. 6, the outer diameter of the signal sleeve 4 is matched with the inner diameter of the annular first step 15, the top and the bottom of the signal sleeve 4 are respectively provided with a closing-in step 28 matched with the outer diameter of the inner supporting cylinder 3, and the inner supporting cylinder 3 is supported by the closing-in step 28 so that a deformation gap 25 is formed between the middle part of the signal sleeve 4 and the inner supporting cylinder 3.
The middle part of the outer wall of the signal sleeve 4 is provided with a circle of slit grooves in a surrounding mode, so that a group of elastic strip structures 29 which are arranged in a surrounding mode are formed in the middle part of the outer wall of the signal sleeve 4, the outer wall of each elastic strip structure 29 is provided with a supporting step 26 with a trapezoid cross section, and the outer diameter of the supporting step 26 is slightly larger than the inner diameter of the annular first step 15.
Working principle: when the wellhead is assembled, in the process of putting the inner pipe column into the inner cavity of the outer pipe column, the signal sleeve 4 passes through the annular first step 15 of the signal barrel 1, and the annular first step 15 can press the supporting step 26 to enable the elastic strip-shaped structure 29 to shrink inwards, so that the signal sleeve 4 can pass through the signal barrel 1;
therefore, when the signal sleeve 4 is to penetrate into the signal barrel 1, the signal sleeve 4 plays a role in signal prompt by utilizing the change of the downward resistance, and the signal sleeve 4 is judged to have reached the position of the signal barrel 1 and is continuously downward, the downward resistance is changed again, so that the signal sleeve 4 is prompted to reach the design position after being compressed inwards and then passes through the signal barrel 1.
Example 3
The embodiment is further optimized based on the embodiment, and specifically comprises the following steps:
the specific installation mode of the sealing ring group 8 is that the lower end of the inner wall of the upper connecting cylinder 7 is connected with the fastening ring 9 through threads, and the sealing ring group 8 is clamped and fixed in the cavity of the upper connecting cylinder 7 through the cooperation of the fastening ring 9 and the inner step 17.
The opening at the top of the sealing ring set 8 is in a horn-shaped structure with an upward opening, and the structure plays a role in guiding and righting the inserted service filling pipe 11, so that the service filling pipe 11 is convenient to insert.
In addition, the sealing ring set 8 comprises rubber sealing rings and metal sealing rings symmetrically distributed on two sides of the rubber sealing rings, the rubber sealing rings are utilized to play a role in elastically buffering the metal sealing rings on two sides, the elastic buffering can drive the metal sealing rings to slightly move or incline, the insertion of the service filling pipe 11 is facilitated, and the metal sealing rings can be arranged in a plurality of layers.
The switch cylinders 12 are axially arranged, two adjacent switch cylinders 12 are connected through a middle pup joint 14, and the switch cylinders 12 play a role in multiple insurance, so that the switch cylinder is particularly suitable for relatively deeper oil wells.
Example 4
The embodiment is further optimized based on the embodiment, and specifically comprises the following steps:
the positions of the inner filling string and the outer well-leaving string of the traditional filling tool after the well is lowered and the length and the size are just matched, but in the assembly, when the tool connected with the upper part of the service filling pipe 11 needs to be lifted and adjusted, no fault-tolerant length allowance exists, so that the whole inner string needs to be lifted and added with a short joint, the whole operation is time-consuming and labor-consuming, and the service filling pipe 11 has a tendency to move upwards under the influence of the well inclination, the pressure and the like in use, which possibly causes the bottom of the service filling pipe 11 to be in contact with the annular second step 24 so as to realize sliding sealing;
therefore, the bottom of the service filling pipe 11 is designed to penetrate out of the annular second step 24, and the penetrating length portion is used as the allowance of the up-and-down movement of the service filling pipe 11, and the allowance is generally controlled to be about 2 meters, so that when the upper tool needs to be lifted up for adjusting and adapting or the service filling pipe 11 moves upwards, the sliding sealing fit between the bottom of the service filling pipe 11 and the annular second step 24 is ensured.
The filling holes 22 are formed in a plurality of the walls of the filling nipple 21 in a surrounding mode at intervals, and filling efficiency can be improved by adopting the design of the filling holes 22.
Claims (8)
1. A self-adjustable bottom filling tool, characterized in that: comprises an outer tubular column and an inner tubular column;
the inner pipe column comprises an upper joint (2), an inner supporting cylinder (3), a service nipple (6) and a service filling pipe (11) which are sequentially connected from top to bottom;
the outer pipe column comprises a signal cylinder (1), a sand prevention nipple (5), an upper connecting cylinder (7), an upper connecting nipple (10), a switch cylinder (12), a lower connecting nipple (19), a lower connecting cylinder (20), a filling nipple (21) and a guide plug (23) which are sequentially connected from top to bottom, the bottom of the switch cylinder (12) is connected with a sealing plate sleeve (13), the bottom of the sealing plate sleeve (13) is elastically hinged with a sealing plate (18) for closing an inner hole of the sealing plate sleeve (13), and a filling hole (22) is formed in the filling nipple (21);
the inner pipe column is movably connected in the inner cavity of the outer pipe column, pushes the sealing plate (18) away through the bottom of the service filling pipe (11), and is then inserted into the filling nipple (21) so that the service filling pipe (11) is communicated with the filling hole (22);
an annular first step (15) in sliding sealing fit with the upper joint (2) is arranged on the inner wall of the signal cylinder (1), an annular second step (24) in sliding sealing fit with the lower end of the service filling pipe (11) is arranged on the inner wall of the lower connecting cylinder (20), and the inner diameter of the annular second step (24) is smaller than that of the annular first step (15);
the upper end of the outer wall of the service filling pipe (11) is provided with an outer step (16), the inner wall of the upper connecting cylinder (7) is provided with an inner step (17) matched with the outer step (16) to support the service filling pipe (11), and a sealing ring group (8) matched with the service filling pipe (11) in a sliding sealing manner is arranged below the inner step (17) in the upper connecting cylinder (7).
2. A self-adjustable bottom filling tool according to claim 1, wherein: the top of the inner support cylinder (3) is connected in the cavity of the upper joint (2), the bottom of the inner support cylinder (3) is provided with a reducing step (27), and a part of the inner support cylinder (3) between the reducing step (27) and the upper joint (2) is sleeved with a signal sleeve (4);
the outer diameter of signal cover (4) and the internal diameter adaptation of annular first step (15), the top and the bottom of signal cover (4) all are equipped with binding off step (28) with interior support section of thick bamboo (3) external diameter adaptation to support in supporting section of thick bamboo (3) through binding off step (28) and make deformation clearance (25) between the middle part of signal cover (4) and interior support section of thick bamboo (3), the middle part of signal cover (4) is a set of elasticity strip structure (29) of encircling the range, be equipped with on the outer wall of elasticity strip structure (29) and take the trapezoid supporting step (26) of cross-section.
3. A self-adjustable bottom filling tool according to claim 1, wherein: the lower end of the inner wall of the upper connecting cylinder (7) is connected with a fastening ring (9) in a threaded manner, and the sealing ring group (8) is fixed in the cavity of the upper connecting cylinder (7) through the cooperation of the fastening ring (9) and the inner step (17).
4. A self-adjustable bottom filling tool according to claim 1, wherein: the opening at the top of the sealing ring group (8) is in a horn-shaped structure with an upward opening.
5. A self-adjustable bottom filling tool according to claim 1, wherein: the switch cylinders (12) are a plurality of switch cylinders which are axially arranged, and two adjacent switch cylinders (12) are connected through a middle short section (14).
6. A self-adjustable bottom filling tool according to claim 1, wherein: the filling holes (22) are a plurality of holes which are circumferentially arranged on the wall of the filling nipple (21) at intervals.
7. A self-adjusting bottom filling tool as defined in claim 4, wherein: the sealing ring group (8) comprises rubber sealing rings and metal sealing rings symmetrically distributed on two sides of the rubber sealing rings.
8. A self-adjustable bottom filling tool according to claim 1, wherein: the bottom of the service filling pipe (11) penetrates out of the annular second step (24), and the penetrated length part is used as the allowance for the up-and-down movement of the service filling pipe (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310714151.2A CN116446827B (en) | 2023-06-16 | Self-adjustable bottom filling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310714151.2A CN116446827B (en) | 2023-06-16 | Self-adjustable bottom filling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116446827A true CN116446827A (en) | 2023-07-18 |
| CN116446827B CN116446827B (en) | 2024-06-28 |
Family
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| CN110080727A (en) * | 2019-04-17 | 2019-08-02 | 中国海洋石油集团有限公司 | A kind of large span perforated interval single multilayer gravel packing operations method |
| CN210530810U (en) * | 2020-04-13 | 2020-05-15 | 山东普瑞思德石油技术有限公司 | One-trip running multilayer filling process pipe column |
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