CN103362112A - Shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing - Google Patents
Shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing Download PDFInfo
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- CN103362112A CN103362112A CN2012101040651A CN201210104065A CN103362112A CN 103362112 A CN103362112 A CN 103362112A CN 2012101040651 A CN2012101040651 A CN 2012101040651A CN 201210104065 A CN201210104065 A CN 201210104065A CN 103362112 A CN103362112 A CN 103362112A
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Abstract
The invention relates to a shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing, which comprises a shaft-shaped foundation, a combination upright, waterproof casings, horizontal connection layers and an upper part chunk, wherein the shaft-shaped foundation of the structure provides the bearing capacity for the structure, provides supporting for hanging of a surface casing, an intermediate casing and an oil string casing in the waterproof casings for well drilling in a drilling process, and provides a safe passage for a normal cycle of a drilling fluid; the cross section of the combination upright is circular; and the combination upright is formed in a manner that pipe walls of large-diameter circular pipes are in welding connection with the waterproof casings. After the structure is mounted in place, the interior, within a certain height range above a mud surface, of the combination upright is required to be filled with cement paste for improving the stiffness of the upright; the waterproof casings provide guiding for the well drilling and exert a function of protecting a well mouth; and the horizontal connection layers are positioned between the combination upright and an upper part deck, and connects the waterproof casings into a whole, so that the stiffness of the structure is improved.
Description
Technical field
The invention belongs to the innovation of simple wellhead platform in the offshore marginal oilfield.
Background technology
In recent years, along with the fast development of economy, oil demand is increasing, the oil consumption increase year after year.China has entered the later development stage in the extensive oil field of exploitation, and having verified can be very few for the self-contained high-quality reserves oil field of exploitation, so the exploitation of marginal oil field becomes more and more important.The exploitation of marginal oil field mainly is subjected to the restriction of development cost, at present in the Bohai Sea and gulf, the Weizhou 31 patterns (standpipes that adopt more,, a cable, a platform) carries out the exploitation of marginal oil field with the form of Oilfield Group, but this form is for the little reserves oil field distant with Oilfield Group, and still can not reach can be for the earning rate of exploitation.Exploitation for these oil fields can not only employ new technology to reduce investment in a conventional manner, just has development benefit.Design-build and the mounting cost of platform account for 30% of whole project investment in the development cost of general shallow water marginal oil field, and the expense that therefore reduces platform is extremely important to the exploitation of marginal oil field, and simplifying offshore platform is the only way of marginal field development.
Summary of the invention
In order to reduce the development cost of small-sized marginal oil field, the invention provides a kind of well head waterproof casing of taking into account and reach from depositing the shallow well barrel structure of supporting, this structure can replace conventional wellhead platform, thereby reduces the development cost in oil field.
This shaft structure makes up column by bucket foundation, waterproof casing, and level connection joint layer and upper chunk form.Bucket foundation is welded to connect by radioactivity strength plate with waterproof casing in the following 5m scope of mud face, and the top cover of bucket foundation is arranged on the following 5m of mud face place.Bucket foundation mainly contains three effects in structure, one, according to the carrying needs of structure deeply to the following certain depth of mud face, for structure provides bearing capacity, prevent that structure from toppling; Two, be that waterproof casing is with the surface pipe of interior drilling well in the drilling process, protective casing, production string hang and to provide support, and guarantee that drilling well carries out smoothly; Three, for the drilling fluid normal circulation provides escape way, prevent well head generation leakage.The combination column is the main support member of shaft structure, is arranged on the mud face to the following certain altitude of the water surface, is connected by welding with bucket foundation.The combination column is circular cross-section, and concrete form is that tube wall and the waterproof casing of major diameter pipe is welded to connect, and major diameter pipe inside arranges the center pipe, and center pipe and waterproof casing on every side utilize radioactivity strength plate to be welded to connect.After structure was in place, cement paste will be filled in combination column inside in the above certain altitude scope of mud face, to increase the rigidity of column.Waterproof casing is the wellhead protecting structure of shaft structure, and waterproof casing extends to the deck from the following 5m of mud face always, bucket foundation be connected the column scope in respectively at bucket foundation be connected column and connect.Waterproof casing has also played the effect of protection well head when providing guiding for drilling well.The level connection joint layer is welded to form by horizontal strength plate and vertical strength plate between combination column and Texas deck, and the level connection joint layer links into an integrated entity each root waterproof casing, plays the effect that increases the rigidity of structure.Upper chunk is positioned at the top of shaft structure, is positioned at the above certain altitude of the water surface.Upper chunk is by column, diagonal brace and deck three parts, and column and waterproof casing are welded to connect, and its specification and quantity are all identical with waterproof casing, and diagonal brace is used for the support deck girder, and the deck is used for putting treatment facility.
The present invention has lightweight construction, and applicability is strong, and it is low to build installation cost, is convenient to remove the characteristics of recovery.Bucket foundation and waterproof casing are designed to one, strengthen the bucket foundation driving depth, replace waterproof casing to provide water proof for drilling well with bucket foundation, the consumption of waterproof casing has been reduced in carry and circulation of drilling fluid space, thereby has reduced the weight of structure.Shaft structure can be made 4 well head shaft structures, 6 well head shaft structures, 8 well head shaft structures according to the needs of exploitation.According to requirements, this shaft structure both can have been made the simple wellhead frame of single deck, can make again the wellhead platform of multideck.Diameter by changing bucket foundation and driving depth be namely applicable to different marine sites and soil property, and can resist that ambient conditions was met in the Bohai Sea in 50 years one and ambient conditions was met at the South Sea in 100 years one.The number of components of shaft structure is few, and the structure principal dimensions is little, requires low for build the side; When at sea installing, this structure only need be installed a bucket foundation and be got final product, and the installation resource demand is low, short construction period.After this shaft structure military service is finished, can drain the seawater of bucket foundation in the following 5m scope of mud face to form the dry-type working space, operating personnel enter this space and carry out well head excision and capping operation.After shut-in well is finished, by reclaiming carrying out water filling in the cylinder and cooperating vibrating hammer shaft structure can be extracted the mud face.
Description of drawings
Below in conjunction with diagram shaft collar of the present invention is described further.
Fig. 1 is the shaft structure schematic diagram;
Fig. 2 is combination column schematic cross-section;
Fig. 3 is level connection joint layer cross section schematic diagram;
Fig. 4 is level connection joint layer cross section schematic diagram in the cylinder.
1-bucket foundation; 2-combination column; 3-waterproof casing; 4-level connection joint layer, 5-chunk diagonal brace; 6-upper chunk; 7-mud face; 8-water surface; 9-radioactivity strength plate; 10-center pipe; 11-horizontal strength plate; 12-vertical strength plate; 13-combination column grout compartment; 14-deck; The 15-column.
The specific embodiment
As shown in Figure 1, a kind of shallow well barrel structure of taking into account the well head waterproof casing and certainly depositing supporting makes up column 2 by bucket foundation 1, waterproof casing 3, and level connection joint layer 4 and upper chunk 6 form.Bucket foundation 1 is welded to connect by radioactivity strength plate 9 with waterproof casing 3 in mud face 7 following 5m scopes, and the top cover of bucket foundation 1 is arranged on mud face 7 following 5m places.Combination column 2 is the main support member of shaft structure, is arranged on mud face 7 to the water surface 8 following certain altitudes, is connected by welding with bucket foundation 1.
As shown in Figure 2, combination column 2 is circular cross-section, concrete form is that tube wall and the waterproof casing 3 of major diameter pipe is welded to connect, and major diameter pipe inside arranges center pipe 10, and center pipe 10 and waterproof casing 3 on every side utilize radioactivity strength plate 9 to be welded to connect.After structure was in place, cement paste will be filled in combination column 2 inside in mud face 7 above certain altitude scopes, formed combination column grout compartment 14, to increase the rigidity of combination column 2.Waterproof casing 3 is the wellhead protecting structure of shaft structure, and waterproof casing 3 extends to deck 14 from mud face 7 following 5m always, bucket foundation 1 be connected column 2 scopes in respectively at bucket foundation 1 be connected column 2 and connect.
Shown in Fig. 3,4, level connection joint layer 4 is welded to form by horizontal strength plate 11 and vertical strength plate 12 between combination column 2 and Texas deck 14, and level connection joint layer 4 links into an integrated entity each root waterproof casing 3.Upper chunk 6 is positioned at the top of shaft structure, is positioned at the water surface 8 above certain altitudes.Upper chunk 6 is by column 15, diagonal brace and deck 14 3 parts, and column 15 is welded to connect with waterproof casing 3, and its specification and quantity are all identical with waterproof casing 3, and diagonal brace is for the support deck girder, and deck 14 is for putting treatment facility.
Claims (7)
1. take into account the well head water proof and certainly deposit the shallow well barrel structure of supporting for one kind, by bucket foundation, the combination column, waterproof casing, level connection joint layer and upper chunk form, the bucket foundation that it is characterized in that the shallow well barrel structure can be taken into account the well head water proof and certainly deposit the effect of support, and this structure can replace conventional wellhead platform, thereby reduces the development cost in oil field.
2. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, it is characterized in that shaft structure is the only pilework of only post, and pile foundation is bucket foundation.
3. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, it is characterized in that bucket foundation has played three effects, one, according to the carrying needs of structure deeply to the following certain depth of mud face, for structure provides bearing capacity, prevent that structure from toppling; Two, be that waterproof casing is with the surface pipe of interior drilling well in the drilling process, protective casing, production string hang and to provide support, and guarantee that drilling well carries out smoothly; Three, for the drilling fluid normal circulation provides escape way, prevent well head generation leakage.
4. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, it is characterized in that making up the main support member that column is shaft structure, constituted jointly by major diameter pipe and waterproof casing, cement paste has been filled to improve the rigidity of column near the column inside the mud face.
5. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, it is characterized in that the level connection joint layer links into an integrated entity each root waterproof casing, plays the effect that increases the rigidity of structure, and the level connection joint layer is plate and shell structure.
6. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, it is characterized in that shaft structure can according to the exploitation needs make 4 well head shaft structures, 6 well head shaft structures, 8 well head shaft structures, according to requirements, this shaft structure both can have been made the simple wellhead frame of single deck, can make again the wellhead platform of multideck, diameter by changing bucket foundation and driving depth be namely applicable to different marine sites and soil property, and can resist that ambient conditions was met in the Bohai Sea in 50 years one and ambient conditions was met at the South Sea in 100 years one.
7. a kind of well head water proof of taking into account according to claim 1 reaches from depositing the shallow well barrel structure of supporting, when it is characterized in that shaft structure is removed, in the 5m space of cylinder type basal top, cut well well cementation, by to water filling in the cylinder and cooperate vibrating hammer shaft structure can be reclaimed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101040651A CN103362112A (en) | 2012-04-11 | 2012-04-11 | Shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101040651A CN103362112A (en) | 2012-04-11 | 2012-04-11 | Shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing |
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| Publication Number | Publication Date |
|---|---|
| CN103362112A true CN103362112A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101040651A Pending CN103362112A (en) | 2012-04-11 | 2012-04-11 | Shallow well shaft structure giving consideration to well mouth waterproofing and self-storage bearing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245616A (en) * | 2015-06-05 | 2016-12-21 | 天津市海王星海上工程技术股份有限公司 | A kind of step barrel mast formula wellhead protecting frame and construction technology |
| CN110422295A (en) * | 2019-08-23 | 2019-11-08 | 山东鼎盛精工股份有限公司 | A kind of list column well head production operation platform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1196992A (en) * | 1968-03-19 | 1970-07-01 | Vickers Ltd | Improved Floatable Structure |
| CN2878506Y (en) * | 2004-11-29 | 2007-03-14 | 天津市海王星海上工程技术有限公司 | Single point mooring portal platform |
| CN201411676Y (en) * | 2009-06-19 | 2010-02-24 | 中国海洋石油总公司 | Simple wellhead oil production platform |
-
2012
- 2012-04-11 CN CN2012101040651A patent/CN103362112A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1196992A (en) * | 1968-03-19 | 1970-07-01 | Vickers Ltd | Improved Floatable Structure |
| CN2878506Y (en) * | 2004-11-29 | 2007-03-14 | 天津市海王星海上工程技术有限公司 | Single point mooring portal platform |
| CN201411676Y (en) * | 2009-06-19 | 2010-02-24 | 中国海洋石油总公司 | Simple wellhead oil production platform |
Non-Patent Citations (1)
| Title |
|---|
| 姜宜辰等: "桶形基础隔水套管水下支架设计", 《中国海洋平台》, vol. 23, no. 6, 31 December 2008 (2008-12-31), pages 19 - 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245616A (en) * | 2015-06-05 | 2016-12-21 | 天津市海王星海上工程技术股份有限公司 | A kind of step barrel mast formula wellhead protecting frame and construction technology |
| CN110422295A (en) * | 2019-08-23 | 2019-11-08 | 山东鼎盛精工股份有限公司 | A kind of list column well head production operation platform |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information |
Address after: 300384 Tianjin City, Nankai District Huayuan Industrial Park Road No. 1 Industrial Park E block six layer Applicant after: NEPTUNE OFFSHORE ENGINEERING DEVELOPMENT CO., LTD. Address before: 300384 Tianjin City, Nankai District Huayuan Industrial Park Road No. 1 Industrial Park E block six layer Applicant before: Haiwangxing Ocean Engineering Technology Co., Ltd, Tianjin City |
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Application publication date: 20131023 |
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| RJ01 | Rejection of invention patent application after publication |