CN112412389A - Fully-closed large-displacement packer capable of preventing foreign matter from blocking immovable pipe column for multi-layer fracturing - Google Patents
Fully-closed large-displacement packer capable of preventing foreign matter from blocking immovable pipe column for multi-layer fracturing Download PDFInfo
- Publication number
- CN112412389A CN112412389A CN202011421086.7A CN202011421086A CN112412389A CN 112412389 A CN112412389 A CN 112412389A CN 202011421086 A CN202011421086 A CN 202011421086A CN 112412389 A CN112412389 A CN 112412389A
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- China
- Prior art keywords
- sleeve
- piston sleeve
- ring
- lower joint
- central pipe
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Abstract
The invention provides a fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and used for multi-layer fracturing. Relates to the technical field of oil field downhole tools. The lower joint is provided with a central pipe sand prevention ring and a lower joint sand prevention ring. The invention has the following beneficial effects: the middle piston sleeve and the lower piston sleeve are arranged to push the upper piston sleeve in a relay manner, the thrust of the upper piston sleeve is doubled, the setting strength is improved, the gap of a pressure transmission hole is smaller than the diameter of fracturing sand (the average diameter of the fracturing sand is 0.22-0.76mm), foreign matters such as the fracturing sand are prevented from entering an annular cavity of the packer from the inner drift diameter of the packer, the locking mechanism operates normally, an exhaust seam prevents the foreign matters such as the fracturing sand from entering a deblocking annular cavity, the packer is deblocked normally, and a spring pushes the setting clamping sleeve, the rubber sleeve seat and the positioning sleeve to move upwards to drive the rubber sleeve and the spacer ring to expand and retract and completely deblock.
Description
The technical field is as follows:
the invention relates to the technical field of oil field downhole tools, in particular to a fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and performing multi-layer fracturing.
Background art:
with the increasing development of the petroleum industry, the petroleum exploitation enters a new stage, a series of fracturing yield increasing modes continuously emerge, wherein a fixed pipe column large-mesh-seam multi-layer integrated fracturing technology is relatively mature and widely applied to various large oil fields, the process overcomes the defects that the original single-layer fracturing is realized and each layer of the pipe column needs to be lifted upwards, a fracturing tool is formed to go into the well once, and the aim of multi-layer fracturing can be fulfilled;
the conventional fracturing packer frequently has the phenomenon that the packer which is not unpacked by lifting a pipe column can not be unpacked in actual fracturing construction, and the unpacked packer accounts for more than 60 percent of the total using amount through repeated investigation. The packer is not the deblocking, plays of tubular column after accomplishing the fracturing and causes very big influence, has increased a large amount of labours, influences the fracturing effect equally, finds through the research, produces this kind of condition because a large amount of fracturing sands pass through pressure transmission hole entering packer inner chamber to fill up the activity space of locking mechanical system during operation, lead to lifting the tubular column after, locking mechanical system's snap ring does not have the release space, leads to the unable deblocking of packer.
The invention content is as follows:
in order to solve the problems, the invention provides a fully-closed large-discharge packer for preventing foreign matters from blocking a fixed pipe column and performing multi-layer fracturing.
The technical scheme of the invention is as follows: a fully-closed large-discharge packer for multi-layer fracturing of a string with a fixed function and capable of preventing foreign matters from blocking comprises an upper joint, wherein the upper joint is in threaded connection with a central pipe, the central pipe is in threaded connection with a lower joint, a central pipe sand prevention ring is arranged on the upper portion of the lower joint and is in threaded sealing connection with the lower joint, the central pipe sand prevention ring is in clearance fit connection with the central pipe, the central pipe sand prevention ring is in clearance fit with the central pipe, and an upper liquid inlet hole is formed in the central pipe;
the outer side of a sand prevention ring of a central pipe is in clearance fit connection with a middle piston sleeve through a sealing ring, the middle piston sleeve is in clearance fit connection with the central pipe through the sealing ring, the lower part of the middle piston sleeve is a lower piston sleeve, the lower piston sleeve is in clearance fit connection with a lower joint through the sealing ring, the inner side of the lower piston sleeve is provided with a lower joint sand prevention ring which is in threaded seal connection with the lower joint, the upper part of the lower joint sand prevention ring is in clearance fit connection with the lower joint, the lower joint sand prevention ring is in clearance fit with the annular surface of the lower joint, and the lower joint is provided with a lower;
the upper piston sleeve is arranged at the upper part of the middle piston sleeve, the upper piston sleeve is connected with the setting sleeve chuck through a setting pin, the upper part of the setting sleeve chuck is in threaded connection with a rubber cylinder seat, the upper part of the rubber cylinder seat is in threaded connection with a positioning sleeve, the positioning sleeve is connected with an upper connector through an unsealing pin, sealing rings are arranged between the positioning sleeve and the upper connector as well as between the positioning sleeve and the rubber cylinder seat, the upper piston sleeve and the rubber cylinder seat are in clearance fit connection through the sealing rings, and a rubber cylinder and a spacer ring are arranged between the positioning sleeve and;
the sitting and sealing sleeve is provided with through grooves which are uniformly distributed in the circumferential direction, positioning fixture blocks are arranged in the through grooves, the outer sides of the positioning fixture blocks are provided with annular grooves, opening sitting and sealing rings are arranged in the annular grooves, one-way toothed rings are arranged on the outer sides of the opening sitting and sealing rings, and one-way toothed sleeves are arranged on inner holes of the upper piston sleeves;
the positioning fixture block is positioned on the boss of the central tube.
When the upper piston sleeve moves upwards to a set position, the one-way gear ring of the opening seat ring is meshed with the one-way gear sleeve of the upper piston sleeve.
The outer wall of the lower part of the upper piston sleeve is provided with an exhaust slit, and the width of the exhaust slit is 0.18-0.2 mm.
The fit clearance between the sand control ring of the central pipe and the central pipe is 0.18-0.2mm, and the fit clearance between the sand control ring of the lower joint and the lower joint is 0.18-0.2 mm.
A spring is arranged between the setting cutting sleeve and the middle piston sleeve.
The positioning sleeve, the rubber cylinder, the spacer ring and the upper piston sleeve are all connected by gluing.
The invention has the following beneficial effects: the middle piston sleeve and the lower piston sleeve are arranged to push the upper piston sleeve in a relay manner, the thrust of the upper piston sleeve is doubled, the setting strength is improved, the gap of a pressure transmission hole is smaller than the diameter of fracturing sand (the average diameter of the fracturing sand is 0.22-0.76mm), foreign matters such as the fracturing sand are prevented from entering an annular cavity of the packer from the inner drift diameter of the packer, the locking mechanism operates normally, an exhaust seam prevents the foreign matters such as the fracturing sand from entering a deblocking annular cavity, the packer is deblocked normally, and a spring pushes the setting clamping sleeve, the rubber sleeve seat and the positioning sleeve to move upwards to drive the rubber sleeve and the spacer ring to expand and retract and completely deblock.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the setting of the present invention;
FIG. 3 is an enlarged view at A of FIG. 2;
fig. 4 is a B-B sectional view of the drawing.
In the figure, 1-lower joint, 2-central tube, 3-rubber cylinder seat, 4-sealing sleeve, 5-opening sealing ring, 6-upper joint, 7-positioning sleeve, 8-rubber cylinder, 9-lower liquid inlet hole, 10-central tube sand prevention ring, 11-upper piston sleeve, 12-central piston sleeve, 13-lower piston sleeve, 14-spacer ring, 15-unsealing pin, 16-positioning clamping block, 17-lower joint sand prevention ring, 18-spring, 19-exhaust slot, 20-one-way gear sleeve, 21-boss, 22-sealing pin, 23-one-way gear ring and 24-upper liquid inlet hole.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
as shown in a combined drawing of fig. 1 and fig. 2-4, the fully-closed large-discharge packer for multi-layer fracturing of the immobile pipe column capable of preventing foreign matter from being blocked comprises an upper joint 6, wherein the upper joint 6 is in threaded connection with a central pipe 2, the central pipe 2 is in threaded connection with a lower joint 1, a central pipe sand prevention ring 10 is arranged at the upper part of the lower joint 1 and is in threaded sealing connection with the lower joint 1, the central pipe sand prevention ring 10 is in clearance fit connection with the central pipe 2, the central pipe sand prevention ring 10 is in clearance fit with the central pipe 2, and an upper liquid inlet hole 24 is formed in the central pipe;
the outer side of a central pipe sand prevention ring 10 is connected with a middle piston sleeve 12 in a clearance fit manner through a sealing ring, the middle piston sleeve 12 is connected with a central pipe 2 in a clearance fit manner through a sealing ring, the lower part of the middle piston sleeve 12 is provided with a lower piston sleeve 13, the lower piston sleeve 13 is connected with a lower joint 1 in a clearance fit manner through a sealing ring, the inner side of the lower piston sleeve 13 is provided with a lower joint sand prevention ring 17 which is in threaded seal connection with the lower joint 1, the upper part of the lower joint sand prevention ring 17 is in clearance fit connection with the lower joint 1, the lower joint sand prevention ring 17 is in a ring surface position in clearance fit with the lower joint 1, and the lower joint 1;
by arranging the middle piston sleeve 12 and the lower piston sleeve 13 to relay and push the upper piston sleeve 11, the pushing force of the upper piston sleeve 11 for pushing the rubber cylinder 8 is doubled, and the setting strength of the rubber cylinder 8 is improved.
The upper part of the middle piston sleeve 12 is provided with an upper piston sleeve 11, the upper piston sleeve 11 is connected with a setting cutting sleeve 4 through a setting pin 22, the upper part of the setting cutting sleeve 4 is in threaded connection with a rubber cylinder seat 3, the upper part of the rubber cylinder seat 3 is in threaded connection with a positioning sleeve 7, the positioning sleeve 7 is connected with an upper connector 6 through an unsealing pin 15, sealing rings are arranged between the positioning sleeve 7 and the upper connector 6 as well as between the rubber cylinder seat 3, the upper piston sleeve 11 and the rubber cylinder seat 3 are in clearance fit connection through the sealing rings, and a rubber cylinder 8 and a spacer ring 14 are arranged between the positioning sleeve 7 and the upper piston sleeve 11;
the setting cutting sleeve 4 is provided with through grooves which are uniformly distributed in the circumferential direction, positioning fixture blocks 16 are arranged in the through grooves, the outer sides of the positioning fixture blocks 16 are provided with annular grooves, opening setting rings 5 are arranged in the annular grooves, one-way toothed rings 23 are arranged on the outer sides of the opening setting rings 5, and one-way toothed sleeves 20 are arranged on inner holes of the upper piston sleeves 11;
the positioning fixture block 16 is located at the position of the boss 21 of the central tube 2, the boss 21 makes the positioning fixture block 16 expand outwards, the opening seat ring 5 is tightly attached to the inner wall of the upper piston sleeve 11, and when the upper piston sleeve 11 moves upwards to a set position, the one-way gear ring 23 of the opening seat ring 5 is meshed with the one-way gear sleeve 20 of the upper piston sleeve 11.
The outer wall of the lower part of the upper piston sleeve 11 is provided with an exhaust slit 19, and the width of the exhaust slit 19 is 0.18-0.2 mm.
Because need promote the piston sleeve 11 compression packing element 8 and realize doing the sealing, go up the ring chamber of piston sleeve 11 and need carry out gas outward and arrange, can lead to at the fracturing in-process, fracturing sand and foreign matter get into the ring chamber by the exhaust hole, lead to the blocked mechanical system to become invalid, unable deblocking, now take the mode processing exhaust slot 19 of wire-electrode cutting, hinder foreign matter such as fracturing sand to get into the ring chamber.
The fit clearance between the central pipe sand prevention ring 10 and the central pipe 2 is 0.18-0.2mm, the fit clearance between the lower joint sand prevention ring 17 and the lower joint 1 is 0.18-0.2mm, fracturing fluid enters through the fit clearance and pushes the middle piston sleeve 12 and the lower piston sleeve 13 to seat, the pressure transmission hole clearance is smaller than the diameter of fracturing sand (the average diameter of the fracturing sand is 0.22-0.76mm), foreign matters such as fracturing sand and the like are prevented from entering a ring cavity of the packer from the inner drift diameter of the packer, so that the locking mechanism normally operates, and the packer is normally unlocked.
After the tools are connected in series, liquid is fed from the inner diameter of the packer in the direction of the lower connector 1 through the upper connector 6, pressure is tested, the liquid is transmitted by the lower connector 1 and the liquid inlet hole 24 and the lower liquid inlet hole 9 at the position of the central tube 2, the upper piston sleeve 12 and the lower piston sleeve 13 move upwards to push the upper piston sleeve 11 to cut the setting pin 22, the lower piston sleeve 13, the middle piston sleeve 12 and the upper connector 6 of the upper piston sleeve 11 move upwards and compress the rubber tube 8 to seal with the sleeve, in the moving process, the one-way gear sleeve 20 of the upper piston sleeve 11 is locked with the one-way gear ring 23 of the opening setting ring 5, the packer is sealed, fracturing construction can be normally carried out, when the packer is unpacked, the tubular column is lifted, the central tube 2 moves to the position of the unpacking pin in the direction of the upper connector 6 to the position by means of the rubber tube 8 and the inner wall of the sleeve, the position of the boss 21 of the locating fixture block 16, in addition, the opening setting ring 05 is separated from the upper piston sleeve 11 due to the resilience force of the rubber sleeve 8, the rubber sleeve 8 is released, and the packer is unsealed.
A spring 18 is arranged between the setting cutting sleeve 4 and the middle piston sleeve 12.
The positioning sleeve 7, the rubber cylinder 8, the spacer ring 14 and the upper piston sleeve 11 are all connected by gluing.
Under the high-temperature and high-pressure environment at the bottom of a well, the rubber cylinder 8 may have rubber aging, partially loses elasticity and has insufficient resilience force, so that the problem of incomplete unsealing and clamping is caused, and the setting clamping sleeve 4, the rubber cylinder seat 3 and the positioning sleeve 7 are pushed to move upwards through the elasticity of the spring 18 to drive the rubber cylinder 8 and the spacer ring 14 to expand and retract, so that the unsealing is completed.
Claims (5)
1. The utility model provides a totally enclosed, big discharge capacity prevent that foreign matter blocks up packer for motionless tubular column multilayer fracturing, includes top connection (6), its characterized in that: the upper joint (6) is in threaded connection with the central pipe (2), the central pipe (2) is in threaded connection with the lower joint (1), the upper portion of the lower joint (1) is provided with a central pipe sand prevention ring (10) which is in threaded sealing connection with the lower joint (1), the central pipe sand prevention ring (10) is in clearance fit connection with the central pipe (2), the central pipe sand prevention ring (10) is in clearance fit with the central pipe (2), and the central pipe (2) is provided with an upper liquid inlet hole (24);
the outer side of a central pipe sand prevention ring (10) is connected with a middle piston sleeve (12) in a clearance fit manner through a sealing ring, the middle piston sleeve (12) is connected with a central pipe (2) in a clearance fit manner through a sealing ring, the lower part of the middle piston sleeve (12) is provided with a lower piston sleeve (13), the lower piston sleeve (13) is connected with a lower joint (1) in a clearance fit manner through a sealing ring, the inner side of the lower piston sleeve (13) is provided with a lower joint sand prevention ring (17) which is in threaded seal connection with the lower joint (1), the upper part of the lower joint sand prevention ring (17) is connected with the lower joint (1) in a clearance fit manner, the lower joint sand prevention ring (17) is in a ring surface position in clearance fit with the lower joint (1), and the lower liquid inlet hole (9;
an upper piston sleeve (11) is arranged on the upper portion of a middle piston sleeve (12), the upper piston sleeve (11) is connected with a setting sleeve chuck (4) through a setting pin (22), the upper portion of the setting sleeve chuck (4) is in threaded connection with a rubber cylinder seat (3), the upper portion of the rubber cylinder seat (3) is in threaded connection with a positioning sleeve (7), the positioning sleeve (7) is connected with an upper connector (6) through a deblocking pin (15), sealing rings are arranged between the positioning sleeve (7) and the upper connector (6) and between the rubber cylinder seat (3), the upper piston sleeve (11) and the rubber cylinder seat (3) are in clearance fit connection through the sealing rings, and a rubber cylinder (8) and a spacer ring (14) are arranged between the positioning sleeve (7) and the upper piston sleeve (11);
the setting sleeve (4) is provided with through grooves which are uniformly distributed in the circumferential direction, positioning fixture blocks (16) are arranged in the through grooves, the outer sides of the positioning fixture blocks (16) are provided with annular grooves, opening setting rings (5) are arranged in the annular grooves, the outer sides of the opening setting rings (5) are provided with one-way toothed rings (23), and the inner hole of the upper piston sleeve (11) is provided with one-way toothed sleeves (20);
the positioning fixture block (16) is positioned on the boss (21) of the central tube (2).
2. The fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and performing multi-layer fracturing according to claim 1, and is characterized in that: an exhaust slit (19) is arranged on the outer wall of the lower part of the upper piston sleeve (11), and the width of the exhaust slit (19) is 0.18-0.2 mm.
3. The fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and performing multi-layer fracturing according to claim 1, and is characterized in that: the fit clearance between the central pipe sand control ring (10) and the central pipe (2) is 0.18-0.2mm, and the fit clearance between the lower joint sand control ring (17) and the lower joint (1) is 0.18-0.2 mm.
4. The fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and performing multi-layer fracturing according to claim 1, and is characterized in that: a spring (18) is arranged between the setting cutting sleeve (4) and the middle piston sleeve (12).
5. The fully-closed large-discharge packer for preventing foreign matter from blocking a fixed pipe column and performing multi-layer fracturing according to claim 1, and is characterized in that: the positioning sleeve (7), the rubber cylinder (8), the spacer ring (14) and the upper piston sleeve (11) are all connected by gluing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011421086.7A CN112412389B (en) | 2020-12-08 | 2020-12-08 | Fully-closed large-displacement packer capable of preventing foreign matter from blocking immovable pipe column for multi-layer fracturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011421086.7A CN112412389B (en) | 2020-12-08 | 2020-12-08 | Fully-closed large-displacement packer capable of preventing foreign matter from blocking immovable pipe column for multi-layer fracturing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112412389A true CN112412389A (en) | 2021-02-26 |
| CN112412389B CN112412389B (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011421086.7A Active CN112412389B (en) | 2020-12-08 | 2020-12-08 | Fully-closed large-displacement packer capable of preventing foreign matter from blocking immovable pipe column for multi-layer fracturing |
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| CN (1) | CN112412389B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116335579A (en) * | 2023-05-26 | 2023-06-27 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2350521Y (en) * | 1998-06-21 | 1999-11-24 | 陈铁栓 | Packer for oil well |
| CN2386188Y (en) * | 1999-04-02 | 2000-07-05 | 李树菊 | Packer for slicing and well washing |
| CN2581684Y (en) * | 2002-09-28 | 2003-10-22 | 长春市恒大石油机械厂 | Expansion type fracture packer |
| CN2739350Y (en) * | 2004-05-21 | 2005-11-09 | 张国军 | Fracturing packer |
| CN2844419Y (en) * | 2005-10-27 | 2006-12-06 | 大庆市萨尔图区登峰石油构件厂 | Minor diameter companding sand control card pressure break packer |
| US20080066917A1 (en) * | 2006-09-14 | 2008-03-20 | Bj Services Company | Annular fracturing combo service tool |
| CN202745795U (en) * | 2012-06-11 | 2013-02-20 | 新疆华油油气工程有限公司 | Hydraulic sealing and de-sealing high-pressure packer |
| CN203296746U (en) * | 2013-06-20 | 2013-11-20 | 史玲春 | Fracture packer |
| CN204436321U (en) * | 2015-02-11 | 2015-07-01 | 中国石油化工股份有限公司 | A kind of sand setting flushing packer |
-
2020
- 2020-12-08 CN CN202011421086.7A patent/CN112412389B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2350521Y (en) * | 1998-06-21 | 1999-11-24 | 陈铁栓 | Packer for oil well |
| CN2386188Y (en) * | 1999-04-02 | 2000-07-05 | 李树菊 | Packer for slicing and well washing |
| CN2581684Y (en) * | 2002-09-28 | 2003-10-22 | 长春市恒大石油机械厂 | Expansion type fracture packer |
| CN2739350Y (en) * | 2004-05-21 | 2005-11-09 | 张国军 | Fracturing packer |
| CN2844419Y (en) * | 2005-10-27 | 2006-12-06 | 大庆市萨尔图区登峰石油构件厂 | Minor diameter companding sand control card pressure break packer |
| US20080066917A1 (en) * | 2006-09-14 | 2008-03-20 | Bj Services Company | Annular fracturing combo service tool |
| CN202745795U (en) * | 2012-06-11 | 2013-02-20 | 新疆华油油气工程有限公司 | Hydraulic sealing and de-sealing high-pressure packer |
| CN203296746U (en) * | 2013-06-20 | 2013-11-20 | 史玲春 | Fracture packer |
| CN204436321U (en) * | 2015-02-11 | 2015-07-01 | 中国石油化工股份有限公司 | A kind of sand setting flushing packer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116335579A (en) * | 2023-05-26 | 2023-06-27 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
| CN116335579B (en) * | 2023-05-26 | 2023-08-11 | 大庆辰平钻井技术服务有限公司 | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method |
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| Publication number | Publication date |
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| CN112412389B (en) | 2021-05-25 |
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