CN110924888A - Multifunctional metal sealing type casing head - Google Patents
Multifunctional metal sealing type casing head Download PDFInfo
- Publication number
- CN110924888A CN110924888A CN201911134494.1A CN201911134494A CN110924888A CN 110924888 A CN110924888 A CN 110924888A CN 201911134494 A CN201911134494 A CN 201911134494A CN 110924888 A CN110924888 A CN 110924888A
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- CN
- China
- Prior art keywords
- casing
- sealing
- casing head
- metal
- head body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 72
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 claims abstract description 39
- 210000002445 nipple Anatomy 0.000 claims abstract description 26
- 239000002905 metal composite material Substances 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 abstract description 10
- 239000010410 layer Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 6
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005493 welding type Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/0422—Casing heads; Suspending casings or tubings in well heads a suspended tubing or casing being gripped by a slip or an internally serrated member
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Gasket Seals (AREA)
Abstract
The invention discloses a multifunctional metal sealing type casing head, which relates to the technical field of petroleum machinery and comprises a casing head body, a technical production casing pipe nipple, a mandrel type hanger assembly, an upper metal sealing assembly and a cover flange, and further comprises a surface layer casing pipe nipple, wherein API threads are arranged in the bottom of the casing head body, API threads are arranged on the surfaces of two ends of the surface layer casing pipe nipple, and two ends of the surface layer casing pipe nipple are respectively connected with a surface layer casing pipe column and the casing head body; the inside cascaded sealed face that can satisfy the sealed requirement of mandrel formula and two kinds of hanging methods of slip formula simultaneously that is equipped with of casing head body, the annular space of the department that the sealed top layer casing pipe nipple joint of cascaded sealed face meets with technical production casing pipe nipple joint realizes metal seal under the mandrel formula hanger. The bottom of the casing head body is connected and designed into a threaded and slip-type integrated structure, namely, the normal well completion adopts a threaded type, if the surface casing pipe is blocked, the slip-type connection can be immediately adopted, and the casing head body does not need to be waited for and replaced.
Description
Technical Field
The invention relates to the technical field of petroleum machinery, in particular to a multifunctional metal sealing type casing head.
Background
In the conventional well drilling and completion process, the connection of a casing head and a surface casing adopts a threaded type, a slip type, an insertion welding type and the like, wherein the insertion welding type is mainly used for the well completion of foreign thermal production wells and common production wells, and most of domestic well drilling and completion adopt the threaded type and the slip type. The mode of producing the casing pipe by the suspension technology mainly comprises a mandrel type and a slip type, and the general casing head has the technical characteristics as follows:
1. the bottom of the casing head is single in processing structure, namely, either a thread type or a slip type is adopted, and the function of interchange use is not realized;
2. when the bottom of the casing head is connected in a threaded manner, if the surface casing is blocked, the slip type casing head needs to be replaced again, the drilling footage period is influenced, and the production cost is increased;
3. in a high-pressure gas well containing acid media such as sulfur and the like, a technical/oil layer casing is suspended in a metal sealing type core shaft mode, a main seal and a secondary seal are in metal sealing, if the technical/oil layer casing is blocked, a slip type suspension casing needs to be adopted, parts such as an emergency casing head four-way joint, an emergency conversion flange, a metal sealing assembly and the like need to be replaced, the drilling footage period is greatly influenced, well control risks are increased, and high production cost input is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multifunctional metal sealing type casing head which comprises a casing head body, a technical production casing pipe nipple, a mandrel type hanger assembly, an upper metal sealing assembly and a cover flange, and further comprises a surface layer casing pipe nipple, wherein API threads are arranged at the bottom of the casing head body, API threads are arranged on the surfaces of two ends of the surface layer casing pipe nipple, and two ends of the surface layer casing pipe nipple are respectively connected with a surface layer casing pipe column and the casing head body; the inside cascaded sealed face that can satisfy the sealed requirement of mandrel formula and two kinds of hanging methods of slip formula simultaneously that is equipped with of casing head body, the annular space of the department that the sealed top layer casing pipe nipple joint of cascaded sealed face meets with technical production casing pipe nipple joint realizes metal seal under the mandrel formula hanger.
The technical effects are as follows: the bottom connection of the casing head body is designed into a threaded and slip type integrated structure, namely, the normal well completion adopts a threaded type, if the surface casing pipe is blocked, the slip type connection can be immediately adopted, and the casing head body does not need to be waited and replaced. The mandrel type hanger adopts a bimetal sealing design, and the structural design is innovated in a lifting mode at the top of the mandrel type hanger, so that the integrated structural design of normal well completion and emergency well completion is realized, the consistency of the integral structure of the slip setting casing head when the mandrel type hanger is set and blocked is kept, the production cost is reduced, and the production efficiency is improved. The whole device has the advantages of compact structure, simple and convenient installation, excellent sealing, durable use, safety, reliability and the like without replacing any component.
The technical scheme of the invention is further defined as follows:
a multi-functional metal seal formula casing head in the past, technology production casing nipple joint is connected the technology production casing tubular column in the pit, and lid flange bottom is equipped with the sealed hole of metal and the sealed oil jacket inner annulus fluid of the sealed oil blanket of metal seal closely cooperateing on the twice.
When a surface sleeve pipe meets a blockage, the surface sleeve pipe is cut on site and connected with the sleeve head body into a whole, and the surface sleeve pipe slip type connecting and sealing assembly is formed and then installed on a surface sleeve pipe short section.
A multi-functional metal seal formula casing head in the past, when technical production sleeve pipe met and hinder, change dabber formula hanger and be emergent slips and the sealed assembly of sleeve pipe outward appearance, emergent slips forms sealedly between technical production sleeve pipe and casing head body, the sealed assembly of sleeve pipe outward appearance forms sealedly between technical production sleeve pipe and lid flange, and the sealed assembly of sleeve pipe outward appearance is located the sealed assembly top of last metal.
The multifunctional metal sealing type casing head comprises a casing outer surface sealing assembly, a casing outer metal sealing group and a casing outer metal composite sealing group, wherein the casing sealing body is arranged between a technical production casing and an upper metal sealing assembly, the casing outer metal sealing group and the casing outer metal composite sealing group are arranged between the technical production casing and the casing sealing body, and the casing outer metal sealing group is positioned below the casing outer metal composite sealing group.
The invention has the beneficial effects that:
(1) according to the invention, the connection mode of the bottom of the casing head body and the surface casing adopts a thread slip integrated structure, so that the design is novel, and the safety and reliability are realized;
(2) the technical production casing adopts mandrel type suspension and slip type suspension, and metal sealing can be realized under the condition of not replacing main parts;
(3) the metal sealing structure on the outer surface of the sleeve is novel, and has excellent bidirectional sealing performance, safety and reliability;
(4) the invention has simple field operation, time and labor saving in the installation process and reduced well control risk;
(5) the invention adopts high-pressure sealing, has reliable performance, strong corrosion resistance and long service life, and greatly reduces the production operation cost.
Drawings
FIG. 1 is a schematic diagram of a normal well completion configuration of the present invention;
FIG. 2 is a schematic representation of the structure of the surface casing after emergency completion of the present invention;
FIG. 3 is a schematic of the post-emergency completion configuration of the technical production casing of the present invention;
FIG. 4 is a schematic view of the casing outer seal assembly of FIG. 3;
wherein: 1. a surface casing nipple; 2. a casing head body; 3. technically producing a sleeve; 4. a spindle hanger assembly; 5. an upper metal seal assembly; 6. a cover flange; 7. the surface layer sleeve slips type connecting and sealing assembly; 8. emergency slips; 9. a sleeve outer surface sealing assembly; 901. a sleeve sealing body; 902. a metal sealing group outside the sleeve; 903. and (3) a metal composite sealing group outside the sleeve.
Detailed Description
The utility model provides a multi-functional metal seal formula casing head, after normal well completion, the structure is as shown in figure 1, including casing head body 2, 3 nipple joints of technical production casing pipe, dabber formula hanger assembly 4, go up metal seal assembly 5, lid flange 6, top layer casing pipe nipple joint 1. The mandrel type hanger assembly 4 adopts a high-pressure resistant composite sealing mode, is reliable in sealing under high pressure, strong in bearing capacity and corrosion resistance, and mainly seals high-pressure fluid in an oil jacket. The upper metal sealing assembly 5 is flexible, firm and reliable, and the high-pressure sealing is reliable. The short section of the technical production casing 3 is connected with a tubular column of the underground technical production casing 3, and the bottom of the cover flange 6 is provided with a metal sealing hole which is tightly matched with two upper metal seals to seal annular fluid in an oil sleeve to form an important fluid-blocking gateway. Be equipped with the API screw thread in casing head body 2 bottoms, 1 both ends surfaces of top layer sleeve pipe nipple joint are equipped with the API screw thread, and 1 both ends of top layer sleeve pipe nipple joint are connected surface layer sleeve pipe post and casing head body 2 respectively. The inside cascaded sealed face that can satisfy the sealed requirement of mandrel formula and two kinds of hanging methods of slip formula simultaneously that is equipped with of casing head body 2, the annular space of the department that the cascaded sealed face sealed top layer sleeve pipe nipple joint 1 meets with 3 nipple joints of technical production sleeve pipe realizes metal seal under the mandrel formula hanger.
When the surface casing meets the resistance, as shown in fig. 2, the surface casing is cut on site and connected with the casing head body 2 into a whole, and the surface casing slip type connecting and sealing assembly 7 is formed and then installed on the surface casing short section 1. The inverted slip structure is safe and reliable, and is provided with two rubber seals for field sealing test.
When the technical production casing 3 encounters a blockage, as shown in fig. 3 and 4, the mandrel-replacement hanger is an emergency slip 8 and a casing surface sealing assembly 9, the emergency slip 8 forms a seal between the technical production casing 3 and the casing head body 2, the casing surface sealing assembly 9 forms a seal between the technical production casing 3 and the cover flange 6, and the casing surface sealing assembly 9 is located above the upper metal sealing assembly 5. The casing outer surface sealing assembly 9 comprises a casing sealing body 901, a casing outer metal sealing group 902 and a casing outer metal composite sealing group 903, wherein the casing sealing body 901 is arranged between the technical production casing 3 and the upper metal sealing assembly 5, the casing outer metal sealing group 902 and the casing outer metal composite sealing group 903 are arranged between the technical production casing 3 and the casing sealing body 901, and the casing outer metal sealing group 902 is positioned below the casing outer metal composite sealing group 903.
The device is directly set through a drilling blowout preventer during normal well completion, and the setting force is stable and durable after the positioning device is screwed; the emergency slip 8 is set, the outer surface of the surface casing pipe is sealed by metal, and the performance is excellent. The multifunctional metal sealed casing head device can be applied to the exploitation of high-pressure gas wells with various well depth structures and the large-scale fracturing exploitation of conventional and unconventional natural gas wells in low-permeability layers, can exert the excellent safety and stability performance by adopting the multifunctional metal sealed casing head device, reduces the production operation cost, and is necessary equipment in the natural gas development, drilling and well completion processes.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. The utility model provides a multi-functional metal seal formula casing head, includes casing head body (2), technical production sleeve pipe (3) nipple joint, dabber formula hanger assembly (4), goes up metal seal assembly (5) and lid flange (6), its characterized in that: the pipe joint is characterized by further comprising a surface casing pipe nipple (1), API threads are arranged in the bottom of the casing head body (2), API threads are arranged on the surfaces of two ends of the surface casing pipe nipple (1), and two ends of the surface casing pipe nipple (1) are respectively connected with a surface casing pipe column and the casing head body (2); the casing head comprises a casing head body (2), and is characterized in that a stepped sealing surface capable of meeting sealing requirements of two suspension modes, namely a mandrel type suspension mode and a slip type suspension mode, is arranged in the casing head body (2), the stepped sealing surface seals an annular space at the joint of a surface casing pipe nipple (1) and a technical production casing pipe nipple (3), and metal sealing under a mandrel type hanger is realized.
2. The multi-functional metal-sealed casing head of claim 1, wherein: the technical production casing pipe (3) short section is connected with the underground technical production casing pipe column (3), and the bottom of the cover flange (6) is provided with a metal sealing hole which is tightly matched with the two upper metal seals to seal annular fluid in the oil jacket.
3. The multi-functional metal-sealed casing head of claim 1, wherein: when the surface casing pipe meets the blockage, the surface casing pipe is cut on site and connected with the casing head body (2) into a whole, and the surface casing pipe slip type connecting and sealing assembly (7) is formed and then is installed on the surface casing pipe short section (1).
4. The multi-functional metal-sealed casing head of claim 1, wherein: when technology production casing (3) meet and hinder, change dabber formula hanger is emergent slips (8) and casing outward appearance seal assembly (9), emergent slips (8) are in technology production casing (3) with form sealedly between casing head body (2), casing outward appearance seal assembly (9) are in technology production casing (3) with form sealedly between lid flange (6), just casing outward appearance seal assembly (9) are located metal seal assembly (5) top.
5. The multi-functional metal-sealed casing head of claim 4, wherein: the sleeve outer surface sealing assembly (9) comprises a sleeve sealing body (901), an outer sleeve metal sealing group (902) and an outer sleeve metal composite sealing group (903), wherein the sleeve sealing body (901) is arranged between the technical production sleeve (3) and the upper metal sealing assembly (5), the outer sleeve metal sealing group (902) and the outer sleeve metal composite sealing group (903) are arranged between the technical production sleeve (3) and the sleeve sealing body (901), and the outer sleeve metal sealing group (902) is positioned below the outer sleeve metal composite sealing group (903).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134494.1A CN110924888A (en) | 2019-11-19 | 2019-11-19 | Multifunctional metal sealing type casing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134494.1A CN110924888A (en) | 2019-11-19 | 2019-11-19 | Multifunctional metal sealing type casing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110924888A true CN110924888A (en) | 2020-03-27 |
Family
ID=69853592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911134494.1A Pending CN110924888A (en) | 2019-11-19 | 2019-11-19 | Multifunctional metal sealing type casing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110924888A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963076A (en) * | 2020-08-05 | 2020-11-20 | 中国石油天然气集团有限公司 | Air-tight screw-connected pipe joint |
| CN113738300A (en) * | 2021-09-22 | 2021-12-03 | 盐城旭东机械有限公司 | Novel sulfur-resistant and scouring-resistant casing head |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060060349A1 (en) * | 2002-02-19 | 2006-03-23 | Duhn Rex E | Wellhead isolation tool and method of fracturing a well |
| WO2009111544A2 (en) * | 2008-03-05 | 2009-09-11 | Cameron International Corporation | Slip hanger assembly and actuator |
| CN201924865U (en) * | 2011-02-15 | 2011-08-10 | 濮阳中石集团有限公司 | Slip type casing head sealing device |
| CN202990942U (en) * | 2012-12-26 | 2013-06-12 | 江苏宏泰石化机械有限公司 | Double-seal Christmas tree for conveniently mounting coiled tubing |
| CN105275423A (en) * | 2014-06-15 | 2016-01-27 | 江苏宏泰石化机械有限公司 | Single-stage casing head with field-replaceable hanger |
| CN212479153U (en) * | 2019-11-19 | 2021-02-05 | 中国石油天然气集团有限公司 | Multifunctional metal sealing type casing head |
-
2019
- 2019-11-19 CN CN201911134494.1A patent/CN110924888A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060060349A1 (en) * | 2002-02-19 | 2006-03-23 | Duhn Rex E | Wellhead isolation tool and method of fracturing a well |
| WO2009111544A2 (en) * | 2008-03-05 | 2009-09-11 | Cameron International Corporation | Slip hanger assembly and actuator |
| CN201924865U (en) * | 2011-02-15 | 2011-08-10 | 濮阳中石集团有限公司 | Slip type casing head sealing device |
| CN202990942U (en) * | 2012-12-26 | 2013-06-12 | 江苏宏泰石化机械有限公司 | Double-seal Christmas tree for conveniently mounting coiled tubing |
| CN105275423A (en) * | 2014-06-15 | 2016-01-27 | 江苏宏泰石化机械有限公司 | Single-stage casing head with field-replaceable hanger |
| CN212479153U (en) * | 2019-11-19 | 2021-02-05 | 中国石油天然气集团有限公司 | Multifunctional metal sealing type casing head |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963076A (en) * | 2020-08-05 | 2020-11-20 | 中国石油天然气集团有限公司 | Air-tight screw-connected pipe joint |
| CN113738300A (en) * | 2021-09-22 | 2021-12-03 | 盐城旭东机械有限公司 | Novel sulfur-resistant and scouring-resistant casing head |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200921 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC BOHAI EQUIPMENT MANUFACTURING Co.,Ltd. Address before: 300457 16 / F, Tianjin building, PetroChina, No.83, Second Avenue, Tianjin Economic and Technological Development Zone, Jinghai District, Tianjin Applicant before: CNPC BOHAI EQUIPMENT MANUFACTURING Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200327 |