CN203847014U - Auxiliary device facilitating recovering of offshore drilling marine riser - Google Patents
Auxiliary device facilitating recovering of offshore drilling marine riser Download PDFInfo
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- CN203847014U CN203847014U CN201420235687.2U CN201420235687U CN203847014U CN 203847014 U CN203847014 U CN 203847014U CN 201420235687 U CN201420235687 U CN 201420235687U CN 203847014 U CN203847014 U CN 203847014U
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- ring
- marine riser
- sheath
- riser
- auxiliary device
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Abstract
The utility model discloses an auxiliary device facilitating recovering of an offshore drilling marine riser. The auxiliary device is arranged on the marine riser in a sleeved mode and located at the position of a drilling wellhead. The auxiliary device comprises a bearing ring, a limiting ring, a rigid ring protecting sleeve and sealing rings, wherein the bearing ring is located on the lower side and fixedly connected with the marine riser, the limiting ring is located on the upper side and fixedly connected with the marine riser, the ring protecting sleeve is arranged between the bearing ring and the limiting ring, and the sealing rings are arranged on the inner sides of the two ends of the ring protecting sleeve. The two ends of the ring protecting sleeve abut against the bearing ring and the limiting ring respectively. During on-site operation, the marine riser on which a marine riser auxiliary device is preinstalled on the land is located close to a mud line, in the well cementation process of the marine riser, a ring sleeve and a ring protecting sleeve form a cementing face, and therefore it can be ensured that the portion, below the mud line, of the marine riser and cement are not bonded together; during the well discarding operation in the later stage, after the portion, below the mud line by a certain length, of the marine riser is cut, the lifting pull can be effectively reduced, time for recovering the marine riser is greatly shortened, and the operation risk is remarkably reduced.
Description
Technical field
The utility model relates to marine riser recovery technology, relates in particular to a kind of servicing unit that Offshore Drilling Riser reclaims of being convenient to.
Background technology
Conventionally when the marine prospect pit of a bite completes, do not exploit or oil gas well mining during to the life-span, in order to protect sea-bottom oil-gas mining deposits, environment, navigation safety, need carry out abandoned well operation to the well of scrapping.According to industry regulation, in northern sea area, the various removings of throwing aside legacy in the seabed of (north latitude 35) should be not less than the following 4m of seabed mud face; Requirement simultaneously, top layer conduit cementing concrete returns height should return mud face.
According to afore mentioned rules and requirement, on-the-spot below mud line at least the position of 4m marine riser is cut, is reclaimed.In operation process, because the cement of marine riser well cementation returns to mud face, cause cement and marine riser surface cementing excessively dead, while causing reclaiming marine riser, often upper lifting force is excessive, not only increases the activity duration, and easily causes complex situations.
In order to improve operating efficiency, reduce operating risk, the utility model proposes a kind of servicing unit of ocean recovery marine riser.
Summary of the invention
For the deficiencies in the prior art, the technical problems to be solved in the utility model is to provide in a kind of offshore oil gas well abandoned well process, is convenient to the servicing unit of being convenient to Offshore Drilling Riser recovery that reduces operating risk, improves operating efficiency.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of servicing unit of being convenient to Offshore Drilling Riser recovery, be sheathed on described marine riser and be positioned at drilling well-head position, described servicing unit comprise downside and be fixedly connected on the retainer ring of described marine riser, upside and be fixedly connected on described marine riser spacing ring, be located at the rigidity between described retainer ring and spacing ring ring sheath, be located at the sealing ring of ring sheath both ends inner side, described ring sheath two ends respectively with retainer ring, spacing ring butt.
The one of being convenient to the technical scheme of the servicing unit of Offshore Drilling Riser recovery as the utility model is improved, and the external diameter of described retainer ring, spacing ring is greater than the interior diameter of described ring sheath.
The one of being convenient to the technical scheme of the servicing unit of Offshore Drilling Riser recovery as the utility model is improved, and the external diameter of described retainer ring, spacing ring is consistent with the external diameter of described ring sheath.
The one of being convenient to the technical scheme of the servicing unit of Offshore Drilling Riser recovery as the utility model is improved, and described ring sheath is cement ring set, ceramic ring set or plastics ring set.
The one of being convenient to the technical scheme of the servicing unit of Offshore Drilling Riser recovery as the utility model is improved, and described ring sheath is straight body cylindrical shell.
The beneficial effects of the utility model are: when field operation, reclaim under the marine riser of servicing unit near mud line be preinstalled with marine riser on land, make to encircle on sheath and correct and (having 4～5m ring set below mud line) near mud line.When marine riser well cementation, ring set and cement sheath form cementation interface, thereby the marine riser that has ensured the following certain length of mud line is not together with cementing, uses ring sheath to replace marine riser together with cementing.In the time of later stage abandoned well operation, after mud line is with next segment distance place cutting marine riser, on can effectively reducing, lift power, greatly improve and reclaim marine riser timeliness, significantly reduce operating risk.And this assistant apparatus structure is simple, can be according to different marine riser sizes, the device of processing corresponding size, material is common materials, and cost of investment is low.This new device can improve reclaim marine riser operating efficiency, and there is very little risk.
Brief description of the drawings
Fig. 1 is the structural representation of the servicing unit embodiment of being convenient to Offshore Drilling Riser recovery of the present utility model.
Detailed description of the invention
Further illustrate detailed description of the invention of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of servicing unit of being convenient to Offshore Drilling Riser recovery of the utility model, be sheathed on described marine riser and be positioned at drilling well-head position, described servicing unit comprise downside and be fixedly connected on the retainer ring 18 of marine riser 10, upside and be fixedly connected on marine riser 10 spacing ring 12, be located at the rigidity between described retainer ring 18 and spacing ring 12 ring sheath 15, be located at the sealing ring 16 of ring sheath 15 both ends inner sides, described ring sheath 15 two ends respectively with retainer ring 18, spacing ring 12 butts.Taking ￠ 30 〞 marine risers under ￠ 36 〞 wells as example, its concrete scheme is: when processing marine riser, before welding marine riser box and pin, doing an internal diameter is ￠ 31 〞, and external diameter is ￠ 33 〞, the ring set that length is 4～5m.Weld a retainer ring in marine riser body lower end (being 4～5m below mud line in the position of well after calculating good being lowered to), ring set is packed on ￠ 30 〞 marine riser bodies, sealing ring pusher is filled in to retainer ring place in ring set lower end.Fill in another sealing ring in ring set upper end, then locating ring is welded on to marine riser upper end.Retainer ring and locating ring ensure that cement sheath can not slide up and down, and sealing encloses sealing and effect placed in the middle.Complete after the installation of this marine riser recovery servicing unit, marine riser box and pin in welding, completes the prepackage of this device in base, land.Ring sheath also can be called ring set.
When field operation, reclaim under this root marine riser of servicing unit near mud line be preinstalled with marine riser on land, make band set upper side just in time near mud line, (have 4～5m ring set below mud line).When marine riser well cementation, ring set and cement sheath form cementation interface, thereby ensure that the marine riser of the following 4～5m of mud line, not together with cementing, uses ring sheath 15 to replace marine riser 10 together with cementing, be convenient to abandoned well and cut the rear extraction marine riser 10 of marine riser 10.In the time of later stage abandoned well operation, below mud line, after 4～5m place cutting marine riser, on can effectively reducing, lift power, greatly improve the timeliness that reclaims marine riser, significantly reduce operating risk.
For the ring set of cement sheath material, because of the too thin insufficient strength of cement sheath, should suitably increase the thickness (for example, external diameter is ￠ 34 〞) of cement sheath.For ensureing that it is lowered to smoothly, the following 4～5m of top layer well suitably reaming hole to (can calculate the reamer that good position place adds corresponding size at drill string) about ￠ 38 〞.Because abandoned well operation final step is for note block cement plug, trip out after the marine riser of partition, cement ring set can not process direct note block cement plug.
For the ring sheath of pottery or plastic material, trip out and cut off after marine riser because of different from block cement plug material, be considered as legacy and should do certain processing, the drill bit that can be lowered to corresponding size is drilled and note the cement plug of blocking a shot again after the following 4m of mud line is eliminated legacy.
Therefore, this assistant apparatus structure is simple, can be according to different marine riser sizes, and the device of processing corresponding size, material is common materials, and cost of investment is low.This new device can improve reclaim marine riser operating efficiency, and there is very little risk.
More preferably, the external diameter of described retainer ring 18, spacing ring 12 is greater than the interior diameter of described ring sheath 15, thereby the effect of the support of playing and stop collar sheath position makes to encircle sheath 15 and is set in definite position, in well head place, is convenient to abandoned well operation.
More preferably, the external diameter of described retainer ring 18, spacing ring 12 is consistent with the external diameter of described ring sheath 15, realizes the effect of support and stop collar sheath position, make to encircle sheath 15 and be set in definite position, in well head place, be convenient to abandoned well operation, do not waste material, be convenient to install under water simultaneously.
More preferably, described ring sheath 15 is cement ring set, ceramic ring set or plastics ring set, can realize the effect of sheath, can trip out easily marine riser 10 and reclaim in the time of abandoned well, is convenient to seal well head after abandoned well.
More preferably, described ring sheath 15 is straight body cylindrical shells, is convenient to and marine riser 10 Matching installations, is convenient to be arranged at the excavation of well head and well head.
Use a kind of recovery of casing of the present utility model to reclaim servicing unit, with ￠ 36 〞 wells, lower ￠ 30 〞 sleeve pipes are example, and concrete operations are as follows:
Land prepackage program:
1) be internal diameter ￠ 31 〞, external diameter ￠ 33 〞, the ring set of height 4～5m;
2) by the bad support marine riser body (measuring the position of 4～5m from one end) that is welded on;
3) ring set is inserted on marine riser, sealing ring pusher is filled in to retainer ring place in lower end;
4) fill in another sealing ring in ring set upper end, then locating ring is welded on to marine riser upper end.
Operation on the sea program:
1) with workboat, the marine riser that is pre-installed marine riser recovery servicing unit is transported to scene, notes protection;
2) bore the eye that drives a well, borehole depth should be corresponding with the marine riser degree of depth, to ensure under this device at mud line place;
3) process well, pulled out of hole;
4) be lowered to marine riser, under the marine riser with servicing unit, near mud line, make band set upper side just in time near mud line, (have 4～5m ring set below mud line);
5) lower marine riser puts in place, well cementation (next column before jack-up unit well cementation).
6) complete other operations of this well, determine abandoned well;
7) complete the abandoned well operation in the past of cutting marine riser by abandoned well program;
8) lower cutter is to the following 4m of mud line, and marine riser is reclaimed in cutting;
9) further process ring set legacy;
10) note block cement plug.
Above disclosed is only preferred embodiment of the present utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim, still belongs to the scope that the utility model is contained.
Claims (5)
1. be convenient to the servicing unit that Offshore Drilling Riser reclaims for one kind, be sheathed on described marine riser and be positioned at drilling well-head position, it is characterized in that: described servicing unit comprise downside and be fixedly connected on the retainer ring of described marine riser, upside and be fixedly connected on described marine riser spacing ring, be located at the rigidity between described retainer ring and spacing ring ring sheath, be located at the sealing ring of ring sheath both ends inner side, described ring sheath two ends respectively with retainer ring, spacing ring butt.
2. the servicing unit of being convenient to Offshore Drilling Riser recovery according to claim 1, is characterized in that: the external diameter of described retainer ring, spacing ring is greater than the interior diameter of described ring sheath.
3. the servicing unit of being convenient to Offshore Drilling Riser recovery according to claim 2, is characterized in that: the external diameter of described retainer ring, spacing ring is consistent with the external diameter of described ring sheath.
4. according to the servicing unit that Offshore Drilling Riser reclaims of being convenient to described in claim 1 or 2 or 3, it is characterized in that: described ring sheath is cement ring set, ceramic ring set or plastics ring set.
5. according to the servicing unit that Offshore Drilling Riser reclaims of being convenient to described in claim 1 or 2 or 3, it is characterized in that: described ring sheath is straight body cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235687.2U CN203847014U (en) | 2014-05-09 | 2014-05-09 | Auxiliary device facilitating recovering of offshore drilling marine riser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235687.2U CN203847014U (en) | 2014-05-09 | 2014-05-09 | Auxiliary device facilitating recovering of offshore drilling marine riser |
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| Publication Number | Publication Date |
|---|---|
| CN203847014U true CN203847014U (en) | 2014-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420235687.2U Expired - Fee Related CN203847014U (en) | 2014-05-09 | 2014-05-09 | Auxiliary device facilitating recovering of offshore drilling marine riser |
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| CN (1) | CN203847014U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227746A (en) * | 2017-06-29 | 2017-10-03 | 中国石油天然气股份有限公司 | Seabed mud face anchor type deep water guide-tube structure and its under water installation method |
| CN107268671A (en) * | 2017-06-29 | 2017-10-20 | 中国石油天然气股份有限公司 | Deep water bucket foundation and its under water installation method |
| CN110043212A (en) * | 2019-05-08 | 2019-07-23 | 中国石油大学(北京) | Assist riser pipe mud extraction device |
-
2014
- 2014-05-09 CN CN201420235687.2U patent/CN203847014U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227746A (en) * | 2017-06-29 | 2017-10-03 | 中国石油天然气股份有限公司 | Seabed mud face anchor type deep water guide-tube structure and its under water installation method |
| CN107268671A (en) * | 2017-06-29 | 2017-10-20 | 中国石油天然气股份有限公司 | Deep water bucket foundation and its under water installation method |
| CN110043212A (en) * | 2019-05-08 | 2019-07-23 | 中国石油大学(北京) | Assist riser pipe mud extraction device |
| CN110043212B (en) * | 2019-05-08 | 2023-10-24 | 中国石油大学(北京) | Auxiliary water-stop conduit mud outlet device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC (China) Limited Zhanjiang Branch Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 China oil tower, 25 Chaoyangmen North Street, Dongcheng District, Beijing Co-patentee before: CNOOC (China) Limited Zhanjiang Branch Patentee before: China National Offshore Oil Corporation |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20210509 |