CN109881670B - Submarine self-disposable recyclable pile shoe of jack-up drilling platform and drilling platform - Google Patents
Submarine self-disposable recyclable pile shoe of jack-up drilling platform and drilling platform Download PDFInfo
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- CN109881670B CN109881670B CN201910231605.4A CN201910231605A CN109881670B CN 109881670 B CN109881670 B CN 109881670B CN 201910231605 A CN201910231605 A CN 201910231605A CN 109881670 B CN109881670 B CN 109881670B
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- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
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Abstract
The invention discloses a submarine self-recoverable jack-up drilling platform pile shoe and a drilling platform, wherein the submarine self-recoverable jack-up drilling platform pile shoe comprises a pile shoe body (1) and a pile shoe (2), the pile shoe body (1) and the pile shoe (2) are arranged up and down, the pile shoe (2) consists of a plurality of pile shoe small blocks (211) arranged along the circumferential direction, and the pile shoe body (1) can move upwards and be separated from the pile shoe (2). This seabed is from recoverable jack-up drilling platform pile shoe under the difficult circumstances of operation when platform pile pulling is evacuated, can carry out the tripping operation under water at any time, make things convenient for platform pile pulling operation to the pile shoe after the tripping, follow-up can carry out independent recovery operation, the pile shoe can decompose into a plurality of independent small blocks, very big reduction the degree of difficulty of recovery operation, avoided the pile shoe of tripping to cause adverse effect to follow-up pile inserting operation, make the seafloor soil resume the original appearance in the maximum.
Description
Technical Field
The invention relates to the field of ocean oil and gas field development equipment, in particular to a submarine self-elevating drilling platform pile shoe which is self-abandoned and recyclable, and also relates to a drilling platform.
Background
Along with the indication of increasing the oil and gas resource exploration and development force of the country, each large petroleum enterprise gradually increases the exploration and development of the land and offshore oil and gas block of the country so as to ensure the national energy safety. The oil and gas exploration and development of the marine shallow water area cannot leave the operation support of the marine self-elevating drilling platform, and the pile inserting and pile pulling operation of the self-elevating drilling platform are two extremely critical links in the offshore operation process. The safety of the platform is closely related to the bearing capacity of the soil body at the lower part during pile inserting operation, the bearing capacity of the soil body to the upper platform is directly related to the property of the soil body and the size of the pile shoe of the platform, and the larger size of the pile shoe can ensure larger stressed area, so that the soil body can provide stronger bearing capacity to ensure the operation safety of the platform, and meanwhile, the depth of the pile legs for inserting the soil is smaller; the operation difficulty of the platform is closely related to lower soil parameters, pile leg dead weight and pile leg mud depth during pile pulling operation, and relatively smaller pile pulling resistance can be ensured by smaller pile leg dead weight and smaller pile leg mud depth, so that the platform is easier to pull piles. However, in the actual working process, pile inserting safety and pile pulling smoothness of the platform are two targets which are difficult to achieve simultaneously. For soil reasons, in most cases, the pile leg needs to be deep into mud to ensure strong bearing capacity, and the pile pulling resistance caused by the deep mud entering depth is high, so that pile pulling is difficult.
Chinese patent CN 206986884U, publication date 2018, 2 and 9, discloses a detachable pile shoe suitable for truss type pile leg, which increases the maximum cross-sectional area of the original pile shoe through the ring blocks connected by bolts to increase the bearing capacity of the pile shoe, and increases the rapid mud-entering effect of the pile shoe by increasing the pile tip height, but the bolts between the ring blocks and the body of the detachable pile shoe bear shear strength, and the overall stability is relatively poor.
Disclosure of Invention
In order to solve the problem of poor stability of the existing detachable pile shoe, the invention provides the pile shoe of the self-elevating drilling platform and the drilling platform, which can be detached underwater at any time under the condition that the operation of the pile shoe of the self-elevating drilling platform is difficult when the pile is pulled out of the platform, so that the pile shoe is convenient for the pile pulling operation of the platform, and the pile shoe after the detachment can be independently recycled in the follow-up process, and can be decomposed into a plurality of independent small blocks, so that the difficulty of recycling operation is greatly reduced, the adverse effect of the detached pile shoe on the follow-up pile inserting operation is avoided, and the original appearance of the seabed soil is restored to the greatest extent. Meanwhile, after the pile shoe is matched with the original pile shoe, the pile tip height of the pile shoe is increased, so that the pile shoe is lower in difficulty when being placed under a harder seabed soil layer, the operation efficiency is higher, and the pile tip is relatively larger in overall size, so that the pile tip is less damaged and is higher in stability.
The technical scheme adopted for solving the technical problems is as follows: the pile shoe comprises a pile shoe body and a pile shoe, wherein the central line of the pile shoe body and the central line of the pile shoe are in an upright state, the pile shoe body and the pile shoe are arranged up and down, and the pile shoe body can move upwards and be separated from the pile shoe; the pile shoe body is of a block-shaped structure, the longitudinal section of the pile shoe body is octagonal, and the pile shoe body comprises a top surface, an upper inclined surface, an outer peripheral surface, a lower inclined surface and a bottom surface which are sequentially connected from top to bottom; the pile shoe consists of a plurality of pile shoe small blocks arranged along the circumferential direction, the lower surface of the pile shoe is of a conical structure with the top end facing downwards, an inserting groove is formed in the upper end of the pile shoe, the longitudinal section of the pile shoe comprises an inner core section and an outer ring section which are sleeved with the inner sleeve along the diameter direction of the pile shoe, and the inner side surface of the upper end of the outer ring section is the inner circumferential surface of the inserting groove; the lower part of the pile shoe body is inserted in the insertion groove in a matched manner.
The top surface is parallel to the bottom surface, the lower surface of the pile shoe is the enlargement of the lower inclined surface and the bottom surface of the pile shoe body, the central line of the pile shoe body is vertical to the top surface, the diameter of the upper end of the outer peripheral surface is the same as the diameter of the lower end of the outer peripheral surface, the longitudinal section of the inner core section is octagonal, and the longitudinal section of the outer ring section is trapezoidal.
The pile shoe body is detachably connected with the pile shoe through a plurality of pins, the pins are uniformly arranged at intervals along the circumference of the pile shoe, pin inserting holes are formed in the outer circumferential surface of the pile shoe body, and pin mounting through holes are formed in the upper end of the outer ring section.
When the depth of the predicted pile leg into mud is smaller and pile pulling operation does not need to release the pile shoe;
the number of pins is calculated as:
when the depth of the predicted pile leg into mud is deeper and pile shoe release is needed during pile pulling operation;
the number of pins is calculated as:
l is the number of pins in one, rounded to a reserved integer;
w is the gravity of the shoe pile, and the unit is N;
f is the soil adsorption force born by the pile shoe, and the unit is N;
F s the shear force of the soil body is N for the pile shoe;
F r the unit of the friction force of the soil body born by the pile shoes is N;
n is the shear strength of the pin and is expressed in N/m 2 ；
D is the diameter of the pin, and the unit is m;
n is a safety coefficient, has no unit and has a value of more than or equal to 1.5.
The up end of stake shoe small body is equipped with the recovery rope that can pull stake shoe small body, along the circumference of stake shoe, one side of stake shoe small body is equipped with the recess, and the opposite side of stake shoe small body is equipped with the lug, and two adjacent stake shoe small bodies pass through lug and recess grafting fixedly.
The pile shoe of the submarine self-elevating drilling platform comprises a plurality of traction ropes, wherein the number of the traction ropes is the same as that of the pins, and the lower ends of the traction ropes are connected and fixed with the outer ends of the pins in a one-to-one correspondence manner.
The pile shoe of the submarine self-elevating drilling platform comprises a straight pipe, a plurality of inclined pipes, wherein the number of the inclined pipes is the same as that of the pins, the upper ends of the inclined pipes are correspondingly connected with the lower ends of the straight pipe, the lower ends of the inclined pipes are in one-to-one correspondence with the outer ends of the pins, and the traction ropes are sleeved in the straight pipe and the inclined pipes.
The lower extreme of inclined tube is located the top of pin outer end, and the lower extreme of inclined tube is equipped with tip fixed pulley outward, and the haulage rope is connected with tip fixed pulley, along the diameter direction of shoe body, and the distance of tip fixed pulley to the pin outer end is greater than the length of pin.
The pile shoe of the submarine self-elevating drilling platform comprises a pile shoe body, a vertical truss is arranged in the truss in a sleeved mode, a plurality of inner-tube locating pulleys are arranged in the inclined tube, a top locating pulley is arranged at the upper end of the truss, a traction rope is connected with the inner-tube locating pulley and the top locating pulley, the inclined tube is fixedly connected with the pile shoe body through a supporting rod, and the straight tube is fixedly connected with the truss through the supporting rod.
The bottom of the drilling platform is provided with the self-elevating drilling platform pile shoe which is self-disposable and recyclable on the seabed.
The beneficial effects of the invention are as follows: this seabed is from recoverable jack-up drilling platform pile shoe under the difficult circumstances of operation when platform pile pulling is evacuated, can carry out the tripping operation under water at any time, make things convenient for platform pile pulling operation to the pile shoe after the tripping, follow-up can carry out independent recovery operation, the pile shoe can decompose into a plurality of independent small blocks, very big reduction the degree of difficulty of recovery operation, avoided the pile shoe of tripping to cause adverse effect to follow-up pile inserting operation, make the seafloor soil resume the original appearance in the maximum. Meanwhile, after the pile shoe is matched with the original pile shoe, the pile tip height of the pile shoe is increased, so that the pile shoe is lower in difficulty when being placed under a harder seabed soil layer, the operation efficiency is higher, and the pile tip is relatively larger in overall size, so that the pile tip is less damaged and is higher in stability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Figure 1 is a schematic view of a subsea disposable retrievable jack-up rig shoe according to the present invention.
FIG. 2 is a schematic diagram of the diameter relationship of the shoe body to the shoe.
Fig. 3 is a schematic longitudinal section of the pile shoe body.
Fig. 4 is a schematic longitudinal section of the shoe.
Fig. 5 is a schematic perspective view of a shoe pile block.
Fig. 6 is a schematic view of the connection mating of stake shoe nubs in a stake shoe.
Fig. 7 is a schematic view of the lower end of the chute.
1. A pile shoe body; 2. stake shoes; 3. a pin; 4. a self-discarding module; 5. truss;
11. a top surface; 12. an upper inclined plane; 13. an outer peripheral surface; 14. a lower inclined plane; 15. a bottom surface;
21. an inner core section; 22. an outer ring section; 23. an inner side surface; 24. a plug-in groove; 25. a lower surface; 26. an outer side surface;
41. a chute; 42. a pulley is fixed inside the tube; 43. a traction rope; 44. a support rod; 45. a straight pipe; 46. a top fixed pulley; 47. an end fixed pulley;
211. stake shoe small blocks; 212. a groove; 213. recovering the rope; 214. a bump;
221. a first stake shoe nub; 222. a second stake shoe nubbin; 223. a third stake shoe nubbin; 224. a fourth stake shoe nubbin; 225. fifth stake shoe small body; 226. sixth stake shoe small body.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The pile shoe comprises a pile shoe body 1 and a pile shoe 2, wherein the central line of the pile shoe body 1 and the central line of the pile shoe 2 are in an upright state, the pile shoe body 1 and the pile shoe 2 are vertically stacked, and the pile shoe body 1 can move upwards and be separated from the pile shoe 2; the pile shoe body 1 is of a block structure, the longitudinal section of the pile shoe body 1 is octagonal, and the pile shoe body 1 comprises a top surface 11, an upper inclined surface 12, an outer peripheral surface 13, a lower inclined surface 14 and a bottom surface 15 which are sequentially connected from top to bottom; the pile shoe 2 is of a flat structure, the pile shoe 2 consists of a plurality of pile shoe small blocks 211 which are arranged along the circumferential direction, the lower surface 25 of the pile shoe 2 is of a conical structure with the top end facing downwards, the upper end of the pile shoe 2 is internally provided with a plug-in groove 24, the longitudinal section of the pile shoe 2 comprises an inner core section 21 and an outer ring section 22 which are sleeved and sleeved inside, and the inner side surface 23 of the upper end of the outer ring section 22 is the inner circumferential surface of the plug-in groove 24; the lower part of the pile shoe body 1 is inserted into the insertion groove 24 in a matching manner (i.e. the surface of the insertion part of the pile shoe body 1 is completely fitted with the inner surface of the insertion groove 24), as shown in fig. 1 to 7.
In this embodiment, the center line of the pile shoe body 1 coincides with the center line of the pile shoe 2, the pile shoe body 1 is octagonal in longitudinal section, the pile shoe body 1 is circular or square in plan view, the pile shoe body 1 is a metal block, and the diameter of the pile shoe body 1 is the largest at the outer peripheral surface 13. The stake shoes 2 are circular or square ring shape in plan view, and the stake shoes 2 are flat block structure. The shoe 2 may be a hollow structure or a solid structure, and when the shoe 2 is a hollow structure, the shoe 2 may be made of steel; when the shoe 2 is of a solid structure, the shoe 2 may be cast of concrete.
In this embodiment, the top surface 11 and the bottom surface 15 are parallel to each other, the bottom surface 15 is parallel to the horizontal plane, the center line of the pile shoe body 1 is perpendicular to the top surface 11, the diameter of the upper end of the outer peripheral surface 13 is the same as the diameter of the lower end of the outer peripheral surface 13, the diameter of the outer peripheral surface 13 is d1 as the diameter of the inner side surface 23 (i.e. the inner peripheral surface of the insertion groove 24) of the outer ring section 22, the diameter of the outer side surface 26 of the outer ring section 22 is d2, the diameter of the pile shoe 2 at the outer side surface 26 is the largest, and d2 is larger than d1. The inner core section 21 has an octagonal longitudinal section, and the outer ring section 22 has a trapezoidal upper inclined surface 12 and the upper surface of the outer ring section 22 are positioned in the same conical surface.
In this embodiment, the lower surface 25 of the shoe 2 is the enlargement of the lower inclined surface 14 and the bottom surface 15 of the shoe body 1, so that the pile tip height of the shoe as a whole is increased from the original h1 to the current h2, thereby making the platform shoe easier to get mud into, and the process of getting it down is smoother and faster, as shown in fig. 1.
In this embodiment, the pile shoe body 1 is detachably connected with the pile shoe 2 through a plurality of pins 3, the pins 3 are uniformly arranged at intervals along the circumferential direction of the pile shoe 2, pin inserting holes are formed in the outer circumferential surface 13 of the pile shoe body 1, and pin mounting through holes are formed in the upper end of the outer ring section 22 and correspond to the positions of the pin mounting through holes one by one. The pin 3 passes through the pin installation through hole, the inner end of the pin 3 is positioned in the pin inserting hole of the pile shoe body 1, and the outer end of the pin 3 is positioned outside the pile shoe 2. The pin 3 is in transition fit with a pin inserting hole on the pile shoe body 1, and the pin 3 is in clearance fit with a pin mounting through hole on the outer ring section 22.
In the present embodiment, the number of pins 3 is calculated using the following calculation formula:
when the depth of the predicted pile leg into mud is smaller (which can be understood as the current depth of the platform into mud, and pile pulling and withdrawing are completed in later operation), the platform can perform pile pulling operation smoothly, namely the phenomenon that the pile pulling of the platform is difficult does not occur, and the pile pulling operation does not need to release the pile shoes 2;
the number of pins 3 is calculated as:
when the depth of the predicted pile leg into mud is deep (which can be understood as that the current platform has large mud entering depth, so that the platform can not smoothly pull out the pile and withdraw the pile due to limited pile pulling capacity of the platform, the pile pulling capacity of the platform is related to the water capacity and the bottom soil property of the platform, platform parameters, pile shoe pile punching capacity, the self weight of the platform and the like), and the pile shoe 2 needs to be released during pile pulling operation;
the number of pins 3 is calculated as:
l is the number of pins 3 in one, rounded to a reserved integer;
w is the gravity of the shoe pile 2, and the unit is N;
f is the soil adsorption force born by the pile shoe 2, and the unit is N;
F s the shear force of the soil body is N for the pile shoe 2;
F r the unit of the friction force of the soil body born by the pile shoe 2 is N;
n is the shear strength of the pin 3, and the unit is N/m 2 ；
D is the diameter of the pin 3, and the unit is m;
n is a safety coefficient, has no unit and has a value of more than or equal to 1.5.
Therein, F, F s And F r The concrete calculation method of (2) can refer to the API specification and the existing calculation method, such as the calculation of pile pulling resistance in section Menglan, zhang Aixia, wang Jianjun and Song Linsong, which are the numerical calculation method for pile pulling resistance prediction of the self-elevating drilling platform, in monograph of pile pulling resistance calculation in self-elevating drilling platform, namely Jiang Wei, wang Shunwen, yang Jin and Liu Shujie.
The pins 3 which are uniformly arranged at intervals are inserted into the reserved pin holes on the pile shoe body 1 and the pile shoe 2, and the pile shoe body 1 and the pile shoe 2 are longitudinally limited: in the process of putting the platform spud leg into the platform, the plurality of pins are mainly used for bearing the gravity of the spud shoes 2; when the pile pulling is not needed to be released when the platform is removed, the plurality of pins 3 mainly bear the action of gravity of the pile shoes 2, soil adsorption force born by the pile shoes, soil shearing force born by the pile shoes, soil friction force born by the pile shoes and the like; the pile shoe 2 is circumscribed on the outer side of the pile shoe body 1, so that the pile shoe body 1 is limited in the horizontal direction.
In this embodiment, the shoe 2 is composed of a plurality of shoe blocks 211 arranged along the circumferential direction of the shoe 2, each shoe block 211 has at least one pin mounting through hole, the upper end surface of the shoe block 211 is provided with a recovery rope 213 capable of pulling the shoe block 211, one side of the shoe block 211 is provided with a groove 212 along the circumferential direction of the shoe 2, the lower end of the groove 212 is communicated with the lower surface of the shoe block 211, i.e. the lower end of the groove 212 forms a notch, the other side of the shoe block 211 is provided with a bump 214, and two adjacent shoe blocks 211 are inserted and fixed with the groove 212 through the bump 214, as shown in fig. 5.
Stake shoe pieces 211 are generally fan-shaped in configuration, with each stake shoe piece 211 being substantially the same size and shape. As shown in fig. 6, in order to facilitate the recovery of each pile shoe 211, the pile shoes 2 are assembled by combining 6 pile shoe blocks 211, and the 6 pile shoe blocks 211 are respectively a first pile shoe block 221, a second pile shoe block 222, a third pile shoe block 223, a fourth pile shoe block 224, a fifth pile shoe block 225, and a sixth pile shoe block 226 in the circumferential direction, as shown in fig. 6, "+" indicates a projection 214, and "-" indicates a groove 212.
Along the circumference of the shoe 2, the first shoe 221, the second shoe 222, the third shoe 223 and the fourth shoe 224 are provided with the protruding block 214 on one side and the groove 212 on the other side, while the fifth shoe 225 is provided with the groove 212 on both sides, and the sixth shoe 226 is provided with the protruding block 214 on both sides, so that when the fifth shoe 225 is lifted by the recovery rope at the upper end face of the fifth shoe 225, the shoe will be separated from other shoes by travelling along the protruding blocks on the sides of the fourth shoe 224 and the sixth shoe 226, and then the fourth shoe 224, the third shoe 223, the second shoe 222, the first shoe 221 and the sixth shoe 226 are lifted in turn, thereby recovering the shoes.
In this embodiment, the pile shoe of the self-elevating drilling platform that is self-disposable and recyclable on the seabed further includes a plurality of hauling ropes 43, the number of the hauling ropes 43 is the same as that of the pins 3, and the lower ends of the hauling ropes 43 are connected and fixed in a one-to-one correspondence with the outer ends of the pins 3. By the pulling action of the pulling rope 43, the plurality of pins 3 for fixing the shoe body 1 and shoe 2 can be pulled out.
Specifically, the lower end of the inclined tube 41 is located above the outer end of the pin 3 (the lower end of the inclined tube 41 can be slightly higher than the outer end of the pin 3), the end fixed pulley 47 is arranged outside the lower end of the inclined tube 41, the traction rope 43 is connected with the end fixed pulley 47, and the distance from the end fixed pulley 47 to the outer end of the pin 3 is greater than the length of the pin 3 along the diameter direction of the pile shoe body 1. When the traction rope 43 is pulled in this way, the plurality of pins 3 in the pile shoe body 1 and the skirt-type pile shoe block 2 can be pulled out, and the separation between the pile shoe body 1 and the skirt-type pile shoe block 2 can be further realized, as shown in fig. 6. In addition, the distance from the end fixed pulley 47 to the center line of the skirt shoe block 2 is preferably smaller than the radius of the outer side surface 26 of the skirt shoe block 2, so as to reduce the resistance of the skirt type self-disposable puncture-resistant jack-up drilling platform shoe to seawater and seafloor soil during the running process, which is suffered by the inclined tube 41, the end fixed pulley 47 and the traction rope 43.
In this embodiment, the pile shoe of the seafloor self-lifting drilling platform further includes a straight pipe 45 and a plurality of inclined pipes 41, the number of the inclined pipes 41 is the same as that of the pins 3, the inclined pipes 41 incline along the upper inclined plane 12 of the pile shoe body 1, the upper ends of the inclined pipes 41 are correspondingly connected with the lower ends of the straight pipe 45, the straight pipe 45 is in an upright state, the lower ends of the inclined pipes 41 are in one-to-one correspondence with the outer ends of the pins 3, and the traction ropes 43 are sleeved in the straight pipe 45 and the inclined pipes 41, namely, each traction rope 43 has a section positioned in the inclined pipe 41 and also has a section positioned in the straight pipe 45.
In this embodiment, the pile shoe of the self-elevating drilling platform that is self-disposable and recyclable on the seabed further comprises a vertical truss 5, a straight pipe 45 is sleeved in the truss 5, a plurality of inner pipe positioning pulleys 42 are arranged at intervals between two ends of the inner part of the inclined pipe 41, a top fixed pulley 46 is arranged at the upper end of the truss 5, a traction rope 43 is connected with the inner pipe positioning pulleys 42 and the top fixed pulley 46, the inclined pipe 41 is fixedly connected with the pile shoe body 1 through a supporting rod 44, and the straight pipe 45 is fixedly connected with the truss 5 through the supporting rod 44.
In the present invention, the inclined tube 41, the in-tube pulley 42, the pulling rope 43, the supporting rod 44, the straight tube 45 and the top fixed pulley 46 may be referred to as the disposable module 4, i.e., the disposable module 4 contains the inclined tube 41, the in-tube pulley 42, the pulling rope 43, the supporting rod 44, the straight tube 45 and the top fixed pulley 46. Truss 5 is located pile shoe body 1's upper end and rather than up end fixed connection, and through a plurality of bracing pieces 44 welded fastening to the straight tube 45 play the spacing effect between straight tube 45 and the truss 5.
In this embodiment, the fixed pulleys 42 are uniformly and symmetrically arranged at intervals on the inner wall of the inclined tube 41 and the uppermost port of the straight tube 45, the fixed pulley 46 on the top is fixed on the top end of the truss 5, and the straight tube 45 is positioned in the center of the truss 5; one section of the hauling rope 43 is positioned in the inclined tube 41 and matched with the in-tube fixed pulley 42 to change the direction of force, the bottom of the hauling rope is fixedly connected with the tail end of each pin 3, the number of the hauling rope is identical to that of the pins 3, the top ends of the hauling rope are converged together to be connected with the other section of hauling rope, and the section of hauling rope is positioned in the straight tube 45 and matched with the top end outlet of the straight tube 45 and the top fixed pulley 46 at the upper end of the truss.
By pulling the traction rope 43 on the platform, the plurality of pins 3 positioned in the pin holes of the pile shoe body 1 and the pile shoe 2 are pulled out, so that the pile shoe 2 and the pile shoe body 1 are released, when the pile leg is lifted up, the pile shoe body 1 is separated from the pile shoe 2, and the pile shoe 2 is temporarily left in the pile shoe footprint on the seabed, so that the pile pulling resistance of the platform is reduced, and the pile pulling operation is easier. The number of the inclined pipes 41 is identical to that of the pins 3, and the inclined pipes 41 are uniformly spaced along the side surface of the pile shoe body and fixed by a plurality of support rods 44.
The bottom of the drilling platform is provided with the self-elevating drilling platform pile shoe which is self-disposable and recyclable on the seabed.
The working process of the shoe type submarine self-disposable self-elevating drilling platform pile shoe is introduced below, and comprises the following steps:
step 1, setting the pile shoe body 1 in the pile shoe 2, and aligning the pile shoe body 1 with pin holes of the pile shoe 2;
step 2, inserting a plurality of pins 3 into pin holes of the pile shoe body 1 and the pile shoe 2;
step 3, fixedly connecting the lower ends of the plurality of sections of traction ropes 43 positioned in the inclined tube 41 with the outer ends of the pins 3 one by one respectively;
step 4, lowering the pile legs for ballasting operation, and comprehensively analyzing whether the pile shoes 2 need to be released during the evacuation operation of the platform according to the pile pulling capacity of the platform, the mud entering depth of the pile legs, the seabed soil quality parameters and the like;
step 5, if the analysis shows that the pile pulling resistance is high and the pile pulling is possibly difficult, pulling out a plurality of pins 3 positioned in the pin holes of the pile shoe body 1 and the pile shoe 2 by pulling the traction rope 43 on the platform, so that the pile shoe 2 and the pile shoe body 1 are released, and when the pile leg is lifted, the pile shoe body 1 is separated from the pile shoe 2, and the pile shoe 2 is temporarily left in a pile shoe footprint on the seabed, so that the pile pulling resistance is reduced, and the pile pulling operation is easier;
step 6, lifting the stake shoe body 211 (such as the fifth stake shoe body 225 in fig. 6) by the recovery cable 213 at the upper end face of the stake shoe body 211, which will run along the projections on the sides of the fourth stake shoe body 224 and the sixth stake shoe body 226 and disengage from the other stake shoe bodies;
step 7, lifting up the fourth pile shoe small block 224, the third pile shoe small block 223, the second pile shoe small block 222, the first pile shoe small block 221 and the sixth pile shoe small block 226 in sequence, so that each pile shoe small block can be lifted up in sequence for recycling.
By using the skirt-type self-disposable self-elevating drilling platform pile shoe and the drilling platform, the bearing capacity of the soil body born by the platform at the same well position is larger, the pile leg mud entering depth is shallower, and when the pile leg mud entering depth is deeper, the pile shoe can be released through the action of the traction rope to achieve the purpose of reducing the pile leg dead weight, so that the resistance born by pile pulling operation is smaller, and the pile pulling operation is smoother. Meanwhile, as the pile shoe consists of the small blocks, when the platform completes pile pulling operation and the pile shoe blocks are left on the sea floor, each small block can be recovered independently, so that the recovery difficulty of the pile shoe is greatly reduced, the original appearance of the sea floor is restored to the greatest extent, and adverse effects on subsequent pile inserting and re-positioning operation are avoided.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical characteristics and technical characteristics, the technical characteristics and technical scheme and the technical scheme can be freely combined for use.
Claims (2)
1. The pile shoe for the self-elevating drilling platform is characterized by comprising a pile shoe body (1) and a pile shoe (2), wherein the center line of the pile shoe body (1) and the center line of the pile shoe (2) are in an upright state, the pile shoe body (1) and the pile shoe (2) are arranged up and down, and the pile shoe body (1) can move upwards and be separated from the pile shoe (2);
the pile shoe body (1) is of a block structure, the longitudinal section of the pile shoe body (1) is octagonal, and the pile shoe body (1) comprises a top surface (11), an upper inclined surface (12), an outer peripheral surface (13), a lower inclined surface (14) and a bottom surface (15) which are sequentially connected from top to bottom;
the pile shoe (2) consists of a plurality of pile shoe small blocks (211) arranged along the circumferential direction, the lower surface (25) of the pile shoe (2) is of a conical structure with the top end facing downwards, an inserting groove (24) is formed in the upper end of the pile shoe (2), the longitudinal section of the pile shoe (2) comprises an inner core section (21) and an outer ring section (22) which are sleeved outside along the diameter direction of the pile shoe (2), and the inner side surface (23) of the upper end of the outer ring section (22) is the inner circumferential surface of the inserting groove (24); the lower part of the pile shoe body (1) is inserted into the insertion groove (24) in a matching way;
the top surface (11) is parallel to the bottom surface (15), the lower surface (25) of the pile shoe (2) is the enlargement of the lower inclined surface (14) and the bottom surface (15) of the pile shoe body (1), the central line of the pile shoe body (1) is vertical to the top surface (11), the diameter of the upper end of the outer peripheral surface (13) is the same as the diameter of the lower end of the outer peripheral surface (13), the longitudinal section of the inner core section (21) is octagonal, and the longitudinal section of the outer ring section (22) is trapezoidal;
the pile shoe comprises a pile shoe body (1) and pile shoes (2), wherein the pile shoe body and the pile shoes (2) are detachably connected through a plurality of pins (3), the pins (3) are uniformly arranged at intervals along the circumferential direction of the pile shoes (2), pin inserting holes are formed in the peripheral surface (13) of the pile shoe body (1), and pin mounting through holes are formed in the upper end of an outer ring section (22);
when the depth of the predicted pile leg into mud is smaller and pile pulling operation does not need to release the pile shoe (2);
the number calculation formula of the pins (3) is as follows:
when the depth of the predicted pile leg into mud is deeper and pile shoe (2) needs to be released during pile pulling operation;
the number calculation formula of the pins (3) is as follows:
l is the number of pins (3), in units of one, rounded to a reserved integer;
w is the gravity of the shoe pile (2) and the unit is N;
f is the soil adsorption force born by the pile shoe (2), and the unit is N;
F s the shear force of soil body is applied to the pile shoe (2) and the unit is N;
F r the unit of the friction force of the soil body born by the pile shoe (2) is N;
n is the shear strength of the pin (3) and is given in N/m 2 ；
D is the diameter of the pin (3) and the unit is m;
n is a safety coefficient, no unit exists, and the value is more than or equal to 1.5;
the upper end face of the pile shoe small block body (211) is provided with a recovery rope (213) capable of pulling the pile shoe small block body (211), a groove (212) is formed in one side of the pile shoe small block body (211) along the circumferential direction of the pile shoe (2), a bump (214) is formed in the other side of the pile shoe small block body (211), and two adjacent pile shoe small block bodies (211) are fixedly spliced with the groove (212) through the bump (214);
the pile shoe of the submarine self-elevating drilling platform comprises a plurality of traction ropes (43), wherein the number of the traction ropes (43) is the same as that of the pins (3), and the lower ends of the traction ropes (43) are connected and fixed with the outer ends of the pins (3) in a one-to-one correspondence manner;
the pile shoe of the submarine self-elevating drilling platform comprises a straight pipe (45) and a plurality of inclined pipes (41), the number of the inclined pipes (41) is the same as that of the pins (3), the upper ends of the inclined pipes (41) are correspondingly connected with the lower ends of the straight pipe (45), the lower ends of the inclined pipes (41) are in one-to-one correspondence with the outer ends of the pins (3), and the traction ropes (43) are sleeved in the straight pipe (45) and the inclined pipes (41);
the lower end of the inclined tube (41) is positioned above the outer end of the pin (3), an end fixed pulley (47) is arranged outside the lower end of the inclined tube (41), the traction rope (43) is connected with the end fixed pulley (47), and the distance from the end fixed pulley (47) to the outer end of the pin (3) is larger than the length of the pin (3) along the diameter direction of the pile shoe body (1);
the pile shoe of the submarine self-elevating drilling platform comprises a pile shoe body (1), a vertical truss (5) is further arranged on the pile shoe body, a straight pipe (45) is sleeved in the truss (5), a plurality of inner-pipe locating pulleys (42) are arranged in an inclined pipe (41), a top locating pulley (46) is arranged at the upper end of the truss (5), a traction rope (43) is connected with the inner-pipe locating pulleys (42) and the top locating pulley (46), the inclined pipe (41) is fixedly connected with the pile shoe body (1) through a supporting rod (44), and the straight pipe (45) is fixedly connected with the truss (5) through the supporting rod (44).
2. A drilling platform, characterized in that the bottom of the drilling platform is provided with the self-elevating drilling platform pile shoe which is self-disposable and recyclable on the seabed and is as claimed in claim 1.
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| CN201910231605.4A CN109881670B (en) | 2019-03-26 | 2019-03-26 | Submarine self-disposable recyclable pile shoe of jack-up drilling platform and drilling platform |
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