CN102200007A - Method for designing annular fracturing injection cross joint - Google Patents
Method for designing annular fracturing injection cross joint Download PDFInfo
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- CN102200007A CN102200007A CN2011101037300A CN201110103730A CN102200007A CN 102200007 A CN102200007 A CN 102200007A CN 2011101037300 A CN2011101037300 A CN 2011101037300A CN 201110103730 A CN201110103730 A CN 201110103730A CN 102200007 A CN102200007 A CN 102200007A
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- injected
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- 238000002347 injection Methods 0.000 title claims abstract description 54
- 239000007924 injection Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 230000006378 damage Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention relates to the field of continuous oil pipes, in particular to a method for designing an annular fracturing injection cross joint for protecting a continuous oil pipe from being directly damaged by high-pressure liquid. The injection cross joint comprises a cross joint body, and an upper flange and a lower flange which are fixed at the upper end and the lower end of the cross joint body. The method is characterized in that: the middle part of the injection cross joint is provided with a through hole, the inside diameter of a continuous oil pipe through hole in the through hole is greater than that of the continuous oil pipe, and the side wall of the middle part of the cross joint body is axially and eccentrically provided with an injection hole along the tangential direction of the through hole; and the through hole is coaxial with the continuous oil pipe, and the continuous oil pipe passes through the through hole of the cross joint and enters the well bottom. The invention provides the method for designing the annular fracturing injection cross joint for preventing direct impact of the high-pressure liquid, furthest protecting the continuous oil pipe, ensuring safe and reliable construction and reducing the economic cost at the same time.
Description
Technical field
The present invention relates to the coiled tubing field, avoid injecting the four-way method for designing from the annular space pressure break of the coup injury of highly pressurised liquid in particular for the protection coiled tubing.
Background technology
Along with the introduction of coiled tubing fracturing technique is used, the annular space fracturing technique is also promoted thereupon, conventional pressure break is injected four-way and is used for coiled tubing annular space pressure break, owing to inject that two injection holes of four-way are in same level height and over against oil pipe, the high-pressure spray cognition of injecting forms the oil pipe tubing string faces impact directly, very big to the damage of coiled tubing.
Summary of the invention
The purpose of this invention is to provide a kind of direct impact of avoiding from high-pressure fluid, farthest protect coiled tubing, guarantee that construction safety reliably carries out, reduce the annular space pressure break of financial cost simultaneously and inject the four-way method for designing.
The technical scheme that the present invention solves its technical problem employing is: a kind of annular space pressure break is injected the four-way method for designing, it comprises four-way body and fixing upper flange, the lower flange of four-way body upper and lower side, it is characterized in that: there is through hole at this injection four-way middle part, the internal diameter of the built-in coiled tubing through hole of through hole is greater than the internal diameter of coiled tubing, and the tangential direction axle center off-centre of the sidewall upper edge through hole at four-way body middle part has injection hole.
Described through hole is coaxial with coiled tubing, and coiled tubing enters the shaft bottom through the through hole of this four-way.
Described lower flange is connected with massive plate valve on casing head or the casing head by its flange hole.
Described upper flange links to each other with coiled tubing lubricator or preventer by its flange hole.
The link of described upper flange and lower flange all has the seal groove of indent.
Described injection hole is fixedlyed connected with the fracturing pump group.
The internal diameter of described through hole is 180mm, and the coiled tubing external diameter is 60mm.
The fracturing fluid pressure of described injection hole input is 20-50MPa, and flow is 1.5-3m
3/ min.
The tangential direction axle center off-centre of the sidewall upper edge through hole at described four-way body middle part has first injection hole and second injection hole, first injection hole and second injection hole lay respectively at the both sides of through hole, and two bursts of fracturing fluid direction of rotation that two injection holes inject are identical.
Stagger the up and down distance of at least one injection hole radius of the axle center of described first injection hole and second injection hole.
The invention has the beneficial effects as follows: coiled tubing can be realized round trip fast; effectively reduce the well control risk simultaneously; simultaneously inject annular space through hole and coiled tubing between through equivalent shunting back from first injection hole and second injection hole from the high pressure fracturing fluid of fracturing pump group output; enter pit shaft pressure break bottom; this annular space pressure break inject four-way since injection hole with respect to through hole axle center off-centre; therefore just avoided the high speed fracturing fluid that coiled tubing is farthest protected in the direct erosion of coiled tubing; guarantee that construction safety reliably carries out; reduce financial cost simultaneously; simultaneously, neither level injection hole has been avoided two strands of high velocity liquid streams to clash into mutually and has been produced the infringement of turbulent flow to the coiled tubing of through hole the inside.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing.
Fig. 1 is the stereogram of the embodiment of the invention;
Fig. 2 is the structural representation of the embodiment of the invention;
Fig. 3 is the sectional drawing of the embodiment of the invention.
Among the figure: 1, upper flange; 2, four-way body; 3, lower flange; 4, through hole; 5, seal groove; 6, flange hole; 7, first injection hole; 8, second injection hole.
The specific embodiment
Shown in the present embodiment structural representation of Fig. 1, Fig. 2, this annular space pressure break is injected four-way and mainly is made of four-way body 2 and fixing upper flange 1, the lower flange 3 of four-way body 2 upper and lower sides, there is through hole 4 at this injection four-way middle part, through hole 4 is built-in with coiled tubing, through hole 4 is coaxial with coiled tubing, coiled tubing enters the shaft bottom through the through hole 4 of this four-way, the internal diameter of through hole 4 is greater than the internal diameter of coiled tubing, therefore between coiled tubing and the through hole 4 bigger gap annular space is arranged, the tangential direction axle center off-centre of the sidewall upper edge through hole 4 at four-way body 2 middle parts has injection hole.
The link of upper flange 1 and lower flange 3 all has the seal groove 5 of indent.
Injection hole is fixedlyed connected with the fracturing pump group.
The internal diameter of through hole 4 is 180mm, and the coiled tubing external diameter is 60mm.
During pressure break, from the high pressure fracturing fluid of fracturing pump group output pressure, 1.5-3m with 20-50MPa
3The flow of/min enters pit shaft pressure break bottom by the annular space between injection hole injection through hole 4 and the coiled tubing, realizes the fracturing reform to the stratum.
Coiled tubing can be realized round trip fast; effectively reduce the well control risk simultaneously; use this annular space pressure break inject four-way since injection hole with respect to through hole 4 axle center off-centre; therefore just avoided the high speed fracturing fluid that coiled tubing is farthest protected in the direct erosion of coiled tubing; guarantee that construction safety reliably carries out, and reduces financial cost simultaneously.
Present embodiment is substantially the same manner as Example 1, difference is that the tangential direction axle center off-centre of the sidewall upper edge through hole 4 at four-way body 2 middle parts has first injection hole 7 and second injection hole 8, first injection hole 7 and second injection hole 8 lay respectively at the both sides of through hole 4, and two bursts of fracturing fluid direction of rotation that two injection holes inject are identical.
Stagger the up and down distance of at least one injection hole radius of the axle center of first injection hole 7 and second injection hole 8, quicken eddy flow to avoid two strands of injection liquid streams to interact to produce, bump produces the infringements of turbulent flow to the coiled tubing of through hole 4 the insides to have avoided two bursts of high velocity liquid to flow mutually.
During pressure break, inject annular space between through hole 4 and the coiled tubing through equivalent shunting back simultaneously from first injection hole 7 and second injection hole 8, enter pit shaft pressure break bottom from the high pressure fracturing fluid of fracturing pump group output.
Claims (10)
1. the annular space pressure break is injected the four-way method for designing, it comprises four-way body (2) and fixing upper flange (1), the lower flange (3) of four-way body (2) upper and lower side, it is characterized in that: there is through hole (4) at this injection four-way middle part, the internal diameter of the built-in coiled tubing through hole of through hole (4) (4) is greater than the internal diameter of coiled tubing, and the tangential direction axle center off-centre of the sidewall upper edge through hole (4) at four-way body (2) middle part has injection hole.
2. annular space pressure break according to claim 1 is injected the four-way method for designing, and it is characterized in that: described through hole (4) is coaxial with coiled tubing, and coiled tubing enters the shaft bottom through the through hole (4) of this four-way.
3. annular space pressure break according to claim 1 is injected the four-way method for designing, it is characterized in that: described lower flange (3) is connected with massive plate valve on casing head or the casing head by its flange hole (6).
4. annular space pressure break according to claim 1 is injected the four-way method for designing, it is characterized in that: described upper flange (1) links to each other with coiled tubing lubricator or preventer by its flange hole (6).
5. annular space pressure break according to claim 1 is injected the four-way method for designing, and it is characterized in that: the link of described upper flange (1) and lower flange (3) all has the seal groove (5) of indent.
6. annular space pressure break according to claim 1 is injected four-way, and it is characterized in that: described injection hole is fixedlyed connected with the fracturing pump group.
7. annular space pressure break according to claim 1 is injected the four-way method for designing, and it is characterized in that: the internal diameter of described through hole (4) is 180mm, and the coiled tubing external diameter is 60mm.
8. annular space pressure break according to claim 1 is injected the four-way method for designing, it is characterized in that: the fracturing fluid pressure of described injection hole input is 20-50MPa, and flow is 1.5-3m
3/ min.
9. annular space pressure break according to claim 1 is injected the four-way method for designing, it is characterized in that: the tangential direction axle center off-centre of the sidewall upper edge through hole (4) at described four-way body (2) middle part has first injection hole (7) and second injection hole (8), first injection hole (7) and second injection hole (8) lay respectively at the both sides of through hole (4), and two bursts of fracturing fluid direction of rotation that two injection holes inject are identical.
10. annular space pressure break according to claim 9 is injected the four-way method for designing, it is characterized in that: stagger the up and down distance of at least one injection hole radius of the axle center of described first injection hole (7) and second injection hole (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101037300A CN102200007A (en) | 2011-04-25 | 2011-04-25 | Method for designing annular fracturing injection cross joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101037300A CN102200007A (en) | 2011-04-25 | 2011-04-25 | Method for designing annular fracturing injection cross joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102200007A true CN102200007A (en) | 2011-09-28 |
Family
ID=44660960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101037300A Pending CN102200007A (en) | 2011-04-25 | 2011-04-25 | Method for designing annular fracturing injection cross joint |
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| Country | Link |
|---|---|
| CN (1) | CN102200007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735545A (en) * | 2015-04-17 | 2018-02-23 | 卡梅伦国际有限公司 | BOP end connections |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5012865A (en) * | 1989-09-26 | 1991-05-07 | Mcleod Roderick D | Annular and concentric flow wellhead isolation tool |
| US20030010498A1 (en) * | 2001-07-13 | 2003-01-16 | Tolman Randy C. | Device and method for injecting fluids into a wellbore |
| US6626245B1 (en) * | 2000-03-29 | 2003-09-30 | L Murray Dallas | Blowout preventer protector and method of using same |
| CN2731077Y (en) * | 2004-09-14 | 2005-10-05 | 吉林石油集团有限责任公司 | High-pressure fracturing well head device |
-
2011
- 2011-04-25 CN CN2011101037300A patent/CN102200007A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5012865A (en) * | 1989-09-26 | 1991-05-07 | Mcleod Roderick D | Annular and concentric flow wellhead isolation tool |
| US6626245B1 (en) * | 2000-03-29 | 2003-09-30 | L Murray Dallas | Blowout preventer protector and method of using same |
| US20030010498A1 (en) * | 2001-07-13 | 2003-01-16 | Tolman Randy C. | Device and method for injecting fluids into a wellbore |
| CN2731077Y (en) * | 2004-09-14 | 2005-10-05 | 吉林石油集团有限责任公司 | High-pressure fracturing well head device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735545A (en) * | 2015-04-17 | 2018-02-23 | 卡梅伦国际有限公司 | BOP end connections |
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Application publication date: 20110928 |