CN205025422U - Deep water is pipe device of cementing well for drilling platform - Google Patents
Deep water is pipe device of cementing well for drilling platform Download PDFInfo
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- CN205025422U CN205025422U CN201520610018.3U CN201520610018U CN205025422U CN 205025422 U CN205025422 U CN 205025422U CN 201520610018 U CN201520610018 U CN 201520610018U CN 205025422 U CN205025422 U CN 205025422U
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Abstract
The utility model provides a deep water is pipe device of cementing well for drilling platform, including the vertical pipe of placing in the well, the pipe is hollow structure, and the upper end of pipe is equipped with input seal assembly, and its lower extreme seals and is equipped with can be towards the one -way pressure valve of opening in the pipe outside, crossover sub that input seal assembly includes shutoff port on the pipe with set up the drilling rod on the crossover sub, the drilling rod has an axial chamber of having a perfect understanding, the entrance hole counterpoint joint offered on the lower port of drilling rod and the crossover sub, be equipped with the piston being close to the crossover sub below, the inner wall sliding sealed fit of piston and pipe, the piston through the stop part portability that can cut set up in the pipe, offered the piston hole on the piston, had a perfect understanding the notes liquid passageway that chamber, entrance hole and piston hole formed and the well plenum chamber of pipe is linked together according to the preface intercommunication, be equipped with the shutoff piece that can seal the piston hole on the piston hole. The utility model provides the high replacement efficiency of grout has reduced danger.
Description
Technical field
The utility model relates to and uses conduit to carry out the technical field of well shaft fixing technology in drilling well, particularly a kind of conductor casing well cementing for deepwater drilling platform.
Background technology
Due to the feature of marine drilling technique self, need the well first with running tool, conduit string being sent into drilling well with thick drilling rod, then in the middle of drilling rod, cement paste is injected, the cement paste injected is replaced with seawater, toroidal cavity cement paste between conduit and well is lived admittedly, keeps the integrality of pit shaft.The technological difficulties of its key be under cement paste Injection Well after, replacing in the process of cement paste with seawater, be easy to cause cement paste to replace uneven, especially in the position that seawater contacts with cement paste, cement paste easily by seawater pollution, and then affects performance and the cementing quality of cement paste.The degree of depth due to the surface conductor pipe of deepwater drilling is general not dark, and cause and wait for the chronic of cement slurry sets, well cementation efficiency is very low.
In order to improve the displacement efficiency of cement paste when deepwater drilling platform is cemented the well, adopt the cementing method inserting " interpolation drilling rod " in the catheter.To connect " interpolation drilling rod " below running tool and insert in conduit, " interpolation drilling rod " meeting one be through to the bottom of conduit.First the cement paste of the certain volume calculated all is injected drilling rod inside, with borehole pump, seawater is injected in " interpolation drilling rod " again, seawater moves downward replacement cement paste in " interpolation drilling rod ", cement paste is replaced out completely " interpolation drilling rod " always and is filled in the annular space between conduit and well.But can delay a lot of time owing to connecting " interpolation drilling rod " operation during downcomer, operating cost can increase a lot.Especially, in deep-well, the time connecing cost time " interpolation drilling rod " is more.And when the poor sealing occurred between running tool and conduit or cement paste have backflow after bruising, cause " interpolation drilling rod " to be sometimes fixed on the complex accident of down-hole by the cement paste that shaft bottom is solidified, add operation danger coefficient.
And due to replace process displacement pressure can be very high, what can exceed borehole pump bears pressure.Institute thinks lowers danger, usually can utilize discharge capacity relatively low well cementation pump that seawater is injected in drilling rod and replace cement paste, reduce the danger of operation, but well cementation pump delivery is general very low, and the whole displacement process time used can be made to become very long.
Utility model content
For solving above-mentioned technical problem, the utility model proposes a kind of deepwater drilling platform conductor casing well cementing easy and simple to handle, improve the displacement efficiency of cement paste, reduce danger.
A kind of deepwater drilling platform conductor casing well cementing of the present utility model, comprise the conduit be vertically placed in well, described conduit is hollow structure, the upper end of described conduit is provided with input black box, its lower end seals, and being provided with in the sealing lower end of described conduit can towards the pressure valve of unidirectional unlatching outside described conduit;
Described input black box comprises the crossover sub being plugged in described conduit upper port and the drilling rod be arranged on described crossover sub, and described drilling rod has axial through chamber, and the lower port of described drilling rod engages with the entrance hole contraposition that described crossover sub is offered;
Below described crossover sub, be provided with piston, described piston coordinates with the inwall slipper seal of described conduit, and described piston can be arranged in described conduit movably by the stop part that can cut off; Described piston offers piston hole, and described through chamber, described entrance hole and described piston hole are sequentially communicated with the reservoir channel being formed and be connected with the hollow chamber of described conduit, and described piston hole is provided with the closeouts closing described piston hole.
As the enforceable mode of one, described piston hole corresponds to described entrance hole and arranges, and described closeouts is to throw into through described reservoir channel and to set the ball sealer on described piston hole.
As the enforceable mode of another kind, described closeouts is seal the switch valve be fixed in described piston hole, is controlled the break-make of described piston hole by described switch valve.
As the enforceable mode of one, the outer wall of described pressure valve and the inner wall sealing of described conduit are fixed.
As the enforceable mode of another kind, in the lower end of described conduit, a contiguous block is fixed in sealing, described contiguous block arranges the delivery outlet be communicated with the hollow chamber of described conduit, and described pressure valve sealing is fixed in described delivery outlet, is controlled the break-make of described delivery outlet by described pressure valve.
Further, one end of described stop part is fixedly connected with the inwall of described conduit, and its other end extends towards the central axis of described conduit, and described stop part is resisted against on the lower surface of described piston; The quantity of described stop part is at least two, and symmetrical relative to the central axis of described conduit.
Further, described stop part is pin.
As the enforceable mode of one, the top of described crossover sub is connected with the lower thread of described drilling rod, and the bottom of described crossover sub is threaded with the top of described conduit.
Further, described piston is disc.
As the enforceable mode of one, described piston is rubber piston.
The utility model is compared to the beneficial effect of prior art: deepwater drilling platform conductor casing well cementing avoids and inserts in conduit " interpolation drilling rod " again, alleviates operation intensity, decreases the activity duration, improves the efficiency replacing cement paste.Because the internal diameter of conduit is much larger than the internal diameter of " interpolation drilling rod ", under same replacement discharge capacity, the displacement pressure replaced needed for cement paste is less, decreases the activity duration, reduces operating cost; And the lower pump of discharge capacity can be adopted to replace, reduce operation danger.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Reference numeral:
10-conduit; 12-crossover sub; 13-piston; 14-stop part; 15-pressure valve; 16-closeouts;
20-drilling rod; 30-well.
Detailed description of the invention
Below in conjunction with accompanying drawing, to above-mentioned being clearly and completely described with other technical characteristic and advantage of the utility model, obviously, described embodiment is only section Example of the present utility model, instead of whole embodiment.
Refer to shown in Fig. 1, a kind of deepwater drilling platform conductor casing well cementing, comprise the conduit 10 be vertically placed in well 30, conduit 10 is hollow structure, the upper end of conduit 10 is provided with input black box, its lower end seals, and being provided with in the sealing lower end of conduit 10 can towards the pressure valve 15 of unidirectional unlatching outside conduit 10.
Input black box comprises the crossover sub 12 being plugged in conduit 10 upper port and the drilling rod 20 be arranged on crossover sub 12, and drilling rod 20 has axial through chamber, and the lower port of drilling rod 20 engages with the entrance hole contraposition that crossover sub 12 is offered.Below crossover sub 12, be provided with piston 13, piston 13 coordinates with the inwall slipper seal of conduit 10, and piston 13 can be arranged in conduit 10 movably by the stop part 14 that can cut off; Piston 13 offers piston hole, and the through chamber of drilling rod 20, the entrance hole of crossover sub 12 and the piston hole of piston 13 are sequentially communicated with the reservoir channel being formed and be connected with the hollow chamber of conduit 10, and piston hole is provided with the closeouts 16 in energy closed piston hole.Cement paste is accommodated in after injecting in the space between hollow chamber's piston 13 of conduit 10 and pressure valve 15.
Between the outer wall of conduit 10 and the inwall of well 30, there is toroidal cavity, the length of conduit 10 length and well 30 matches, normal conditions downcomer 10 length should be shorter a little than well 30 degree of depth, makes to have between the bottom of the bottom of conduit 10 and well 30 interval that water supply mud circulates.In the present embodiment, the external diameter of drilling rod 20 is 5.5 inches, and the height of drilling rod 20 is the degree of depth of seawater and the turntable surface difference in height sum to sea level.Conduit 10 can also for the conduit string be formed by connecting by multistage pipe.
The use procedure of deepwater drilling platform conductor casing well cementing is as follows: the hollow chamber first via reservoir channel, cement paste being injected into conduit 10, closeouts 16 closed piston hole, seawater is injected again via reservoir channel (the through chamber of drilling rod 20 and the entrance hole of crossover sub 12), the pressure of seawater make closeouts 16 reliably shutoff on piston hole, the seawater continuing to inject forces in closeouts 16 and piston 13 until cut off stop part 14, the pressure of seawater promotes closeouts 16 and the synchronous slide downward of piston 13, cement paste in the hollow chamber of the synchronous slide downward extruded conduit 10 of closeouts 16 and piston 13, cement paste pressurized opens pressure valve downwards, cement paste enters annular space via the interval of conduit 10 bottom, continue to inject seawater thus all cement pastes replacing out the hollow chamber of conduit 10 gradually, after cement slurry sets, conduit 10 is fixed in well 30, complete well cementation.
Deepwater drilling platform conductor casing well cementing avoids and inserts " interpolation drilling rod " in conduit 10 again, alleviates operation intensity, decreases the activity duration, improves the efficiency replacing cement paste, is conducive to rapid well cementation.Because the internal diameter of conduit 10 is much larger than the internal diameter of " interpolation drilling rod ", under same replacement discharge capacity, the displacement pressure replaced needed for cement paste is less, decreases the activity duration, reduces operating cost; And the lower pump of discharge capacity (such as: well cementation pump) can be adopted to replace, use the lower pump of discharge capacity to reduce the danger of operation.
As the enforceable mode of one, piston hole corresponds to entrance hole and arranges, and closeouts 16 is to throw into through reservoir channel and to set the ball sealer on piston hole.Ball sealer is through the through chamber of drilling rod 20 piston hole that fall into piston 13 on vertical with the entrance hole of crossover sub 12, thus start the operation injecting seawater, ball sealer can shutoff piston hole effectively under seawater pressure effect, start to build the pressure, ball sealer can avoid the seawater injected by piston hole down water leaking-in mud, effectively can ensure the quality of cement paste.The sphere diameter of ball sealer is less than the internal diameter in the through chamber of drilling rod 20, is less than the internal diameter of the entrance hole of crossover sub 12, is greater than the internal diameter of piston hole.Closeouts 16 can also be an inverted cone, and the conical surface of cone matches with the inwall of piston hole formation shutoff.
As the enforceable mode of another kind, closeouts 16 is seal the switch valve be fixed in piston hole, is controlled the break-make of piston hole by switch valve.Opening switch valve, injects cement paste via reservoir channel; Closing switch valve, injects seawater via the through chamber of drilling rod 20 and the entrance hole of crossover sub 12, and seawater compressing is on piston 13 and after cutting off stop part 14, and seawater promotes piston 13 and glides, and the switch valve be fixed on piston 13 synchronously glides.More preferably, entrance hole is arranged on the center of crossover sub 12, and piston hole is positioned at the center of piston 13, is conducive to whole well cementing process uniform force, and cement paste exports steadily.
As the enforceable mode of one, the outer wall of pressure valve 15 and the inner wall sealing of conduit 10 are fixed.As the enforceable mode of another kind, in the lower end of conduit 10, a contiguous block is fixed in sealing, and contiguous block arranges the delivery outlet be communicated with the hollow chamber of conduit 10, and pressure valve 15 sealing is fixed in delivery outlet.Controlled the break-make of delivery outlet by pressure valve 15, the lower end of conduit 10 is sealed into the cavity holding cement paste by pressure valve 15, pressure valve 15 is downward unidirectional unlatching under the extruding force effect of cement paste, and cement paste flows into toroidal cavity with well cementation.
More preferably, the stroke of piston 13 slide downward is identical with the height for the space holding cement paste in the hollow chamber of conduit 10, enables cement paste all be replaced out for well cementation, avoids cement paste at the internal residual of conduit 10.
Further, one end of stop part 14 is fixedly connected with the inwall of conduit 10, and its other end extends towards the central axis of conduit 10, and stop part 14 is resisted against on the lower surface of piston 13.More preferably, stop part 14 relative to the central axis lateral arrangement of conduit 10, and can bear certain intensity.More preferably, the quantity of stop part 14 is at least two, and symmetrical relative to the central axis of conduit 10, can support piston 13 equably, and piston 13 can not discontinuity equalization when stop part 14 is cut off, and ensure that piston 13 can glide continued smooth.Further, stop part 14 is pin.In the present embodiment, the quantity of stop part 14 is two.
As the enforceable mode of one, the top of crossover sub 12 is connected with the lower thread of drilling rod 20, and the bottom of crossover sub 12 is threaded with the top of conduit 10.In the present embodiment, entrance hole is isometrical through hole through on crossover sub 12; Crossover sub 12 can also be positive and negative screw-thread sleeve, the center of sleeve is through hole, through hole is the entrance hole for fluid injection, and the upper and lower of through hole arranges the contrary screw thread of the hand of spiral, is respectively used to connect the drilling rod 20 being positioned at top and the conduit 10 being positioned at below.
Further, piston 13 is disc.Disc small volume, can make the space holding cement paste in the hollow chamber of conduit 10 relatively large, improves and replaces and well cementation efficiency.
As the enforceable mode of one, piston 13 is rubber piston.Rubber piston can ensure with the sealing of the inwall of conduit 10 reliable.
Above-described specific embodiment; further detailed description has been carried out to the purpose of this utility model, technical scheme and beneficial effect; should be appreciated that and the foregoing is only specific embodiment of the utility model, and be not used in restriction protection domain of the present utility model.Particularly point out, to those skilled in the art, all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a deepwater drilling platform conductor casing well cementing, comprise the conduit be vertically placed in well, described conduit is hollow structure, it is characterized in that, the upper end of described conduit is provided with input black box, its lower end seals, and being provided with in the sealing lower end of described conduit can towards the pressure valve of unidirectional unlatching outside described conduit;
Described input black box comprises the crossover sub being plugged in described conduit upper port and the drilling rod be arranged on described crossover sub, and described drilling rod has axial through chamber, and the lower port of described drilling rod engages with the entrance hole contraposition that described crossover sub is offered;
Below described crossover sub, be provided with piston, described piston coordinates with the inwall slipper seal of described conduit, and described piston can be arranged in described conduit movably by the stop part that can cut off; Described piston offers piston hole, and described through chamber, described entrance hole and described piston hole are sequentially communicated with the reservoir channel being formed and be connected with the hollow chamber of described conduit, and described piston hole is provided with the closeouts closing described piston hole.
2. deepwater drilling platform conductor casing well cementing according to claim 1, is characterized in that, described piston hole corresponds to described entrance hole and arranges, and described closeouts is to throw into through described reservoir channel and to set the ball sealer on described piston hole.
3. deepwater drilling platform conductor casing well cementing according to claim 1, is characterized in that, described closeouts is seal the switch valve be fixed in described piston hole, is controlled the break-make of described piston hole by described switch valve.
4. deepwater drilling platform conductor casing well cementing according to claim 1, is characterized in that, the outer wall of described pressure valve and the inner wall sealing of described conduit are fixed.
5. deepwater drilling platform conductor casing well cementing according to claim 1, it is characterized in that, in the lower end of described conduit, a contiguous block is fixed in sealing, described contiguous block arranges the delivery outlet be communicated with the hollow chamber of described conduit, described pressure valve sealing is fixed in described delivery outlet, is controlled the break-make of described delivery outlet by described pressure valve.
6. the deepwater drilling platform conductor casing well cementing according to any one of claim 1 to 5, it is characterized in that, one end of described stop part is fixedly connected with the inwall of described conduit, and its other end extends towards the central axis of described conduit, and described stop part is resisted against on the lower surface of described piston; The quantity of described stop part is at least two, and symmetrical relative to the central axis of described conduit.
7. the deepwater drilling platform conductor casing well cementing according to any one of claim 1 to 5, is characterized in that, described stop part is pin.
8. the deepwater drilling platform conductor casing well cementing according to any one of claim 1 to 5, it is characterized in that, the top of described crossover sub is connected with the lower thread of described drilling rod, the bottom of described crossover sub is threaded with the top of described conduit.
9. the deepwater drilling platform conductor casing well cementing according to any one of claim 1 to 5, is characterized in that, described piston is disc.
10. the deepwater drilling platform conductor casing well cementing according to any one of claim 1 to 5, is characterized in that, described piston is rubber piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520610018.3U CN205025422U (en) | 2015-08-13 | 2015-08-13 | Deep water is pipe device of cementing well for drilling platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520610018.3U CN205025422U (en) | 2015-08-13 | 2015-08-13 | Deep water is pipe device of cementing well for drilling platform |
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| Publication Number | Publication Date |
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| CN205025422U true CN205025422U (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520610018.3U Active CN205025422U (en) | 2015-08-13 | 2015-08-13 | Deep water is pipe device of cementing well for drilling platform |
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| CN (1) | CN205025422U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431519A (en) * | 2021-06-30 | 2021-09-24 | 湖北鄂西新能源有限公司 | Small borehole grouting well cementation method and device |
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2015
- 2015-08-13 CN CN201520610018.3U patent/CN205025422U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431519A (en) * | 2021-06-30 | 2021-09-24 | 湖北鄂西新能源有限公司 | Small borehole grouting well cementation method and device |
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