CN209854712U - Degradable self-elevating drilling platform pile shoe and drilling platform - Google Patents
Degradable self-elevating drilling platform pile shoe and drilling platform Download PDFInfo
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- CN209854712U CN209854712U CN201920388657.8U CN201920388657U CN209854712U CN 209854712 U CN209854712 U CN 209854712U CN 201920388657 U CN201920388657 U CN 201920388657U CN 209854712 U CN209854712 U CN 209854712U
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Abstract
The utility model discloses a degradable formula is from lift-type drilling platform pile shoe and drilling platform, but degradable formula is from lift-type drilling platform pile shoe includes pile shoe body (1) and pile shoe (2), sets up from top to bottom pile shoe body (1) and pile shoe (2), and pile shoe body (1) can the rebound and with pile shoe (2) separation, and pile shoe (2) can be decomposed completely by oneself after the seabed is for a certain length. Through using this degradable formula from lift-type drilling platform boots and drilling platform, can be so that the soil body bearing capacity that receives at same well position department platform is bigger and the spud leg is gone into mud degree of depth more shallow, when the spud leg is gone into mud degree of depth and is led to the pile pulling operation difficulty deeply, can break away from the purpose that reduces the spud leg dead weight to soluble formula boots through the effect of haulage rope, make the resistance that the pile pulling operation received littleer, the pile pulling operation is more smooth, and this soluble formula boots can be abandoned in the seabed, can decompose the non-staining environment by oneself after certain length and do not influence the platform and take one's place again.
Description
Technical Field
The utility model relates to a marine oil gas field development equipment field, specific is a degradable formula is from lift-type drilling platform pile shoe, still is a drilling platform.
Background
Along with the indication of increasing the oil and gas resource exploration and development strength provided by the country, the exploration and development of land and offshore oil and gas blocks in China are gradually increased by each large petroleum enterprise to ensure the national energy safety. The oil and gas exploration and development in the ocean shallow water area can not be supported by the operation of the ocean self-elevating drilling platform, and the pile inserting and pile pulling operation of the self-elevating drilling platform are two very 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 the pile inserting operation, the bearing capacity of the soil body on the upper part 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 a larger stress area, so that the soil body can provide stronger bearing capacity to ensure the operation safety of the platform, and the mud penetration depth of the pile leg is relatively smaller; during pile pulling operation, the operation difficulty degree of the platform is closely related to lower soil parameters, the dead weight of the pile legs and the mud penetration depth of the pile legs, and relatively smaller pile pulling resistance can be ensured by smaller dead weight of the pile legs and smaller mud penetration depth of the pile legs, so that pile pulling operation can be performed more easily by the platform. However, in the actual operation process, pile inserting safety and pile pulling smoothness of the platform are two targets which are difficult to achieve simultaneously. Due to the soil property, the pile legs can ensure stronger bearing capacity only by needing to enter into the mud with deeper depth under most conditions, and the pile pulling difficulty is caused by the larger pile pulling resistance caused by the deeper mud entering depth.
Chinese patent CN 206986884U, published as 2018, 2/9, discloses a detachable pile shoe suitable for truss type pile leg, which increases the maximum cross-sectional area of the original pile shoe through a ring block connected by a bolt to increase the bearing capacity of the pile shoe, and increases the quick mud entering effect of the pile shoe by increasing the pile tip height, but the bolt between the ring block and the body of the detachable pile shoe bears the shear strength, and the overall stability is relatively poor.
SUMMERY OF THE UTILITY MODEL
In order to solve the present relatively poor problem of removable pile shoe stability, the utility model provides a degradable formula is from lift-type drilling platform pile shoe and drilling platform, through using this degradable formula is from lift-type drilling platform pile shoe and drilling platform, can make the soil body bearing capacity that the platform receives at the same well position department bigger and the spud leg go into the mud degree of depth more shallow, when the spud leg goes into the mud degree of depth and when darker or other reasons lead to pile pulling operation difficulty, can release the purpose in order to reach the reduction spud leg dead weight to soluble pile shoe through the effect of haulage rope, make the resistance that pile pulling operation received littleer, pile pulling operation is more smooth, and this soluble pile shoe can abandon in the seabed, can decompose the non-staining environment and do not influence the platform by oneself after certain length and take one's place again.
The utility model provides a technical scheme that its technical problem adopted is: a degradable self-elevating drilling platform 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 both 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 is separated from the pile shoe; the pile shoe body is of a block 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 is of a hollow shell structure, the pile shoe comprises an upper shell plate and a lower shell plate, the upper shell plate and the lower shell plate are fixedly connected through a supporting plate, the lower surface of the pile shoe is in a conical shape with the top end facing downwards, and the pile shoe can be completely decomposed automatically after a certain time of the seabed; the upper end of each pile shoe is internally provided with an inserting groove, the longitudinal section of each pile shoe comprises an inner core section and an outer ring section which are sleeved inside and outside 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 peripheral surface of the inserting groove; the lower part of the pile shoe body is inserted into the insertion groove in a matching manner.
The top surface is parallel to the bottom surface, the lower surface of the pile shoe is the enlargement of the lower inclined plane and the bottom surface of the pile shoe body, the center 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 that 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 shoes through a plurality of pins, the pins are arranged along the circumferential direction of the pile shoes at even intervals, pin inserting holes are formed in the outer peripheral face of the pile shoe body, and pin mounting through holes are formed in the upper ends of the outer ring sections.
When the predicted depth of the pile leg into the mud is smaller and pile shoe pulling operation is not required to be released;
the number of pins is calculated by the formula:
when the depth of the pile leg entering the mud is predicted to be deeper and pile shoes need to be released during pile pulling operation;
the number of pins is calculated by the formula:
l is the number of pins, the unit is one, and the reserved integer is rounded;
w is the gravity of the pile shoe, and the unit is N;
f is the soil body adsorption force borne by the pile shoe, and the unit is N;
Fsthe unit is N, and the unit is the soil body shearing force borne by the pile shoe;
Frthe unit of the soil friction force borne by the pile shoes is N;
n is the shear strength of the pin, in N/m2；
D is the diameter of the pin and is in m;
n is a safety coefficient, has no unit and takes a value of more than or equal to 1.5.
The degradable self-elevating drilling platform pile shoe further comprises a plurality of traction ropes, the traction quantity is the same as that of the pins, and the lower ends of the traction ropes are fixedly connected with the outer ends of the pins in a one-to-one correspondence mode.
But degradation formula self-elevating drilling platform pile shoe still includes straight tube and many pipe chute, and the quantity of pipe chute is the same with the quantity of pin, and the upper end of pipe chute corresponds with the lower extreme of straight tube and is connected, the lower extreme of pipe chute and the outer end one-to-one of pin, and straight tube and pipe chute are located to the haulage rope cover.
The lower end of the inclined tube is located above the outer end of the pin, an end fixed pulley is arranged outside the lower end of the inclined tube, the traction rope is connected with the end fixed pulley, and the distance from the end fixed pulley to the outer end of the pin is larger than the length of the pin along the diameter direction of the pile shoe body.
But degradation formula is from lift-type drilling platform pile shoe still includes upright truss, and the straight tube cover is equipped with a plurality of intraductal fixed pulleys in locating the truss in, and the upper end of truss is equipped with the top fixed pulley, and the haulage rope is connected with intraductal fixed pulley and top fixed pulley, and the pipe chute passes through the bracing piece to be fixed with this body coupling of pile shoe, and the straight tube passes through the bracing piece to be fixed with truss coupling.
The degradable self-elevating drilling platform pile shoe is arranged at the bottom of the drilling platform.
The utility model has the advantages that: through using this degradable formula from lift-type drilling platform boots and drilling platform, can be so that the soil body bearing capacity that receives at same well position department platform is bigger and the spud leg is gone into mud degree of depth more shallow, when the spud leg is gone into mud degree of depth and is led to the pile pulling operation difficulty deeply, can break away from the purpose that reduces the spud leg dead weight to soluble formula boots through the effect of haulage rope, make the resistance that the pile pulling operation received littleer, the pile pulling operation is more smooth, and this soluble formula boots can be abandoned in the seabed, can decompose the non-staining environment by oneself after certain length and do not influence the platform and take one's place again.
Drawings
The accompanying drawings, which form a part of the present application, 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 and not to limit the invention.
Fig. 1 is a schematic view of the degradable self-elevating drilling platform pile shoe of the present invention.
Fig. 2 is a schematic view of the diameter relationship between the pile shoe body and the pile shoe.
Figure 3 is a schematic longitudinal section of the shoe body.
Figure 4 is a schematic longitudinal section of a stake shoe.
Fig. 5 is a schematic view of the fitting of the pile shoe body to the pile shoe.
Fig. 6 is a schematic view of the lower end of the chute.
1. A pile shoe body; 2. piling shoes; 3. a pin; 4. a self-abandoning module; 5. a 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 segment; 22. an outer ring segment; 23. an inner side surface; 24. inserting grooves; 25. a lower surface; 26. an outer side surface; 27. a support plate; 28. an upper shell plate; 29. a lower shell plate;
41. an inclined tube; 42. a fixed pulley in the pipe; 43. a hauling rope; 44. a support bar; 45. a straight pipe; 46. a top fixed pulley; 47. an end fixed pulley.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A degradable self-elevating drilling platform pile shoe comprises a pile shoe body 1 and pile shoes 2, wherein the central line of the pile shoe body 1 and the central line of the pile shoes 2 are both in an upright state, the pile shoe body 1 and the pile shoes 2 are arranged in an up-and-down stacked manner, and the pile shoe body 1 can move upwards and is separated from the pile shoes 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 is of a hollow shell structure, the pile shoe 2 comprises an upper shell plate 28 and a lower shell plate 29, the upper shell plate 28 and the lower shell plate 29 are fixedly connected through a supporting plate 27, the lower surface 25 of the pile shoe 2 is of a cone shape (frustum shape) with the top end facing downwards, and the pile shoe 2 can be completely decomposed automatically after a certain period of time in the seabed; 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 inside and outside along the diameter direction of the pile shoe 2, and the inner side 23 at the upper end of the outer ring section 22 is the inner circumferential surface of the inserting groove 24; the lower part of the shoe body 1 fits into the insertion groove 24 (i.e. the surface of the insertion part of the shoe body 1 fits completely into the inner surface of the insertion groove 24), as shown in fig. 1 to 5.
In this embodiment, the center line of the shoe body 1 coincides with the center line of the pile shoe 2, the longitudinal section of the shoe body 1 is octagonal, the plan view of the shoe body 1 is circular or square, the shoe body 1 is a metal block, and the diameter of the shoe body 1 at the outer peripheral surface 13 is the largest. The pile shoe 2 is in a circular or square ring shape in plan view, and the pile shoe 2 is in a flat block structure.
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. The longitudinal section of the inner core section 21 is octagonal, and the longitudinal section of the outer ring section 22 is a trapezoidal upper inclined plane 12 and the upper surface of the outer ring section 22 are located in the same cone.
In this embodiment, the lower surface 25 of the pile shoe 2 is enlarged by the lower slope 14 and the bottom surface 15 of the pile shoe body 1, so that the pile tip height of the pile shoe as a whole is increased from the original h1 to the current h2, thereby the platform pile shoe is easier to be filled with mud, and the filling process is smoother and faster, as shown in fig. 1. The upper shell 28 and the lower shell 29 are stacked one on top of the other, the support plate 27 is in an upright position, and the thickness H of the support plate 27 is greater than the thickness L of the upper shell 28 and the lower shell 29, as shown in fig. 1. The support plates 27 are arranged in a cross-sectional pattern between the upper shell plate 28 and the lower shell plate 29 such that a plurality of cavities are formed between the upper shell plate 28 and the lower shell plate 29.
In this embodiment, pile shoe body 1 can be dismantled with pile shoe 2 through a plurality of pins 3 and be connected, and a plurality of pins 3 are equipped with the pin spliced eye in the outer peripheral face 13 of pile shoe body 1 along the even interval arrangement of circumference of pile shoe 2, and the upper end of outer loop segment 22 is equipped with pin installation through-hole, this pin spliced eye and pin installation through-hole's position one-to-one. The pin 3 passes through the pin mounting 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 by the following calculation formula:
when the predicted pile leg mud penetration depth is smaller (the current mud penetration depth of the platform can be understood, and when pile pulling and withdrawing are completed in later-stage operation, the platform can be used for pile pulling operation smoothly, namely the phenomenon that the pile of the platform is difficult to pull 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 pile leg into the mud is predicted to be deep (the current depth of the platform into the mud can be understood to be large, so that the platform cannot smoothly pull piles and withdraw when the platform pulls piles in the follow-up process due to the limited pile pulling capacity of the platform, and the pile pulling capacity of the platform is related to the draught capacity and the properties of seabed soil, platform parameters, pile shoe pile-punching capacity, the self weight of the platform and the like), and pile shoes 2 need to be released during pile pulling operation;
the number of pins 3 is calculated as:
l is the number of the pins 3, the unit is one, and the reserved integer is rounded;
w is the gravity of the pile shoe 2, and the unit is N;
f is the soil body adsorption force borne by the pile shoe 2, and the unit is N;
Fsthe unit of the soil body shearing force borne by the pile shoe 2 is N;
Frthe unit is N, and the unit is the soil body friction force borne by the pile shoe 2;
n is the shear strength of the pin 3 in N/m2；
D is the diameter of the pin 3 and the unit is m;
n is a safety coefficient, has no unit and takes a value of more than or equal to 1.5.
Wherein, F, FsAnd FrThe concrete calculation method can refer to API specifications and the existing calculation method, such as pile pulling resistance calculation part contents in the special self-elevating drilling platform pile inserting operation control technology-Jiangwei, Wang Shunwen, Yangxin and Liu Shujie and the numerical calculation method for self-elevating drilling platform pile pulling resistance prediction in the journal-Qimenglan, Zhang Aixia, Wangjian army and Song Lin Song.
During the pin hole of reserving on a plurality of even interval arrangement's pin 3 insert pile shoe body 1 and pile shoe 2, play vertical spacing effect to pile shoe body 1 and pile shoe 2: during the process of putting the platform pile leg into the pile shoe, the pins are mainly used for bearing the gravity of the pile shoe 2; when the pile pulling is carried out after the platform is withdrawn and the pile shoes 2 do not need to be released, the pins 3 mainly bear the actions of the gravity of the pile shoes 2, the soil adsorption force borne by the pile shoes, the soil shearing force borne by the pile shoes, the soil friction force borne by the pile shoes and the like; because the pile shoe 2 is externally tangent to the outer side of the pile shoe body 1, the pile shoe body 1 is limited in the horizontal direction.
The calculation formula for the axial length of the outer side of the inner core segment 21 is:
h3 is the axial length of the outside face of the inner core segment 21 in m, as shown in FIG. 4;
Fwfor the maximum prepressing loading capacity of the drilling platform or the pile shoe in the subsequent operation processThe maximum weight borne is in units of N;
s is the shear strength of the pile shoe 2 and has the unit of N/m2；
And m is a safety coefficient without unit and takes a value of more than or equal to 1.5.
The maximum pre-pressing loading capacity of the drilling platform or the maximum gravity borne by the pile shoe in the subsequent operation process is fixed (the influence of later stage modification of the platform is not included), and the maximum pre-pressing loading capacity or the maximum gravity borne by the pile shoe in the subsequent operation process can be inquired according to a playship manual of each platform. The shear strength of the piling shoe 2 is determined by its material itself, with reference to the strength of its material.
In this embodiment, the material of the pile shoe 2 is magnesium-aluminum alloy, which is a prior art, that is, the upper shell plate 28, the lower shell plate 29 and the support plate 27 are made of magnesium-aluminum alloy, which is composed of magnesium, aluminum and sand, wherein the different proportions of magnesium, aluminum and sand will be different when being dissolved by seawater, and preferably, the mass ratio of magnesium, aluminum and sand in the magnesium-aluminum alloy is 3: 5: 2. the magnesium-aluminum alloy can be automatically and completely decomposed (i.e. dissolved or degraded) in seawater after a certain period of time, wherein the certain period of time can be half a year to one year. Because stake shoes 2 are vacant shell type structure, contain a plurality of inner chambers in stake shoes 2, in order to reduce the sea water buoyancy that stake shoes 2 received, the lower surface and the lateral surface of stake shoes 2 can set up a plurality of through-holes, like this when going into stake shoes 2, the sea water can get into in the inner chamber of stake shoes 2 through the through-hole.
In this embodiment, the pile shoe of the degradable self-elevating drilling platform further comprises 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 fixedly connected with the outer ends of the pins 3 in a one-to-one correspondence manner. The plurality of pins 3 for fixing the shoe body 1 and the shoe 2 can be pulled out by the pulling action of the pulling rope 43.
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 may be slightly higher than 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 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 shoe body 1 and the shoe 2 can be pulled out, and further separation between the shoe body 1 and the shoe 2 is achieved, as shown in fig. 6. In addition, the distance from the end fixed pulley 47 to the center line of the pile shoe 2 is preferably smaller than the radius of the outer side 26 of the pile shoe 2, so as to reduce the resistance of the inclined tube 41, the end fixed pulley 47 and the traction rope 43 to seawater and subsoil during the running of the degradable jack-up drill platform pile shoe.
In this embodiment, but degradation formula jack-up drilling platform pile shoe still includes straight tube 45 and many pipe chute 41, and the quantity of pipe chute 41 is the same with the quantity of pin 3, and pipe chute 41 inclines along last inclined plane 12 of pile shoe body 1, and the upper end of pipe chute 41 corresponds with the lower extreme of straight tube 45 and is connected, and straight tube 45 is the state of standing upright, and the lower extreme of pipe chute 41 and the outer end one-to-one of pin 3, in straight tube 45 and pipe chute 41 were located to haulage rope 43 cover, every haulage rope 43 all contained to be located one section in pipe chute 41 promptly, also contain to be located one section in straight tube 45.
In this embodiment, the degradable self-elevating drilling platform pile shoe further includes an upright truss 5, a straight pipe 45 is sleeved in the truss 5, a plurality of spaced-arranged pipe-inside fixed pulleys 42 are arranged between two ends inside the inclined pipe 41 and the two ends, a top fixed pulley 46 is arranged at the upper end of the truss 5, a traction rope 43 is connected with the pipe-inside fixed pulleys 42 and the top fixed pulley 46, the inclined pipe 41 is fixedly connected with the pile shoe body 1 through a support rod 44, and the straight pipe 45 is fixedly connected with the truss 5 through the support rod 44.
In the present invention, the inclined tube 41, the inner fixed pulley 42, the pulling rope 43, the supporting rod 44, the straight tube 45 and the top fixed pulley 46 can be referred to as the self-abandoning module 4, and the self-abandoning module 4 contains the inclined tube 41, the inner fixed pulley 42, the pulling rope 43, the supporting rod 44, the straight tube 45 and the top fixed pulley 46. The truss 5 is located the upper end of pile shoe body 1 and rather than up end fixed connection, plays limiting displacement to the straight tube 45 through a plurality of bracing pieces 44 welded fastening between straight tube 45 lateral wall and the truss 5.
In the embodiment, the in-pipe fixed pulleys 42 are uniformly and symmetrically arranged at the inner wall of the inclined pipe 41 and the uppermost port of the straight pipe 45 at intervals, the top fixed pulley 46 is fixed at the top end of the truss 5, and the straight pipe 45 is positioned at the center of the truss 5; one section of the traction rope 43 is positioned in the inclined tube 41 and matched with the fixed pulley 42 in the tube to change the direction of the force, the bottom of the traction rope is fixedly connected with the tail end of each pin 3, the number of the traction rope is consistent with that of the pins 3, the top ends of the traction ropes are gathered together and connected with the other section of traction rope, and the section of traction rope is positioned in the straight tube 45 and matched with the top fixed pulley 46 at the top end outlet of the straight tube 45 and the upper end of the truss.
Through pulling haulage rope 43 on the platform, pull out a plurality of pins 3 that are located pile shoe body 1 and pile shoe 2 pin hole for release between pile shoe 2 and the pile shoe body 1, when carrying the spud leg on, pile shoe body 1 separates with pile shoe 2, and pile shoe 2 is left over temporarily in the pile shoe footprint on seabed, thereby reduces the pile pulling resistance of platform and makes pile pulling operation easier. The number of the inclined pipes 41 is the same as that of the pins 3, and the inclined pipes 41 are uniformly arranged along the side surface of the pile shoe body at intervals and are fixed through a plurality of support rods 44.
A rig having the aforementioned degradable jack-up rig shoe disposed on the bottom thereof is described below.
The working process of the degradable self-elevating drilling platform pile shoe is introduced as follows, which comprises the following steps:
step 1, a pile shoe body 1 is arranged in a pile shoe 2 in a sitting mode, and pin holes of the pile shoe body 1 and the pile shoe 2 are aligned;
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 a 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 ballast operation, and comprehensively analyzing whether the pile shoes 2 need to be released during the evacuation operation according to the pile pulling capacity of the platform, the mud penetration depth of the pile legs, the seabed soil property parameters and the like;
step 5, if the analysis considers that pile pulling resistance is large and the pile pulling is difficult, pulling out the plurality of pins 3 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 separated, 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 the pile shoe footprint on the seabed, so that the pile pulling resistance is reduced, and the pile pulling operation is easier.
Through using this degradable formula from lift-type drilling platform boots and drilling platform, can be so that the soil body bearing capacity that receives at same well position department platform is bigger and the spud leg is gone into mud degree of depth more shallow, when the spud leg is gone into mud degree of depth and is led to the pile pulling operation difficulty deeply, can break away from the purpose that reduces the spud leg dead weight to soluble formula boots through the effect of haulage rope, make the resistance that the pile pulling operation received littleer, the pile pulling operation is more smooth, and this soluble formula boots can be abandoned in the seabed, can decompose the non-staining environment by oneself after certain length and do not influence the platform and take one's place again.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and the technical scheme all can the independent assortment use.
Claims (9)
1. The degradable self-elevating drilling platform pile shoe is characterized by comprising a pile shoe body (1) and pile shoes (2), wherein the central line of the pile shoe body (1) and the central line of the pile shoes (2) are in an upright state, the pile shoe body (1) and the pile shoes (2) are arranged up and down, and the pile shoe body (1) can move upwards and is separated from the pile shoes (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 shoes (2) are of a hollow shell type structure, the pile shoes (2) comprise upper shell plates (28) and lower shell plates (29), the upper shell plates (28) and the lower shell plates (29) are fixedly connected through supporting plates (27), the lower surfaces (25) of the pile shoes (2) are in a conical shape with the top end facing downwards, and the pile shoes (2) can be completely decomposed automatically after a certain period of time in the seabed;
an inserting groove (24) is formed in the upper end of each pile shoe (2), an inner core section (21) and an outer ring section (22) which are sleeved inside and outside are arranged on the longitudinal section of each pile shoe (2) along the diameter direction of each pile shoe (2), and the inner side surface (23) of the upper end of each 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 manner.
2. The degradable jack-up rig pile shoe according to claim 1, characterized in that the top surface (11) is parallel to the bottom surface (15), the lower surface (25) of the pile shoe (2) is an enlargement of the lower slope surface (14) and the bottom surface (15) of the pile shoe body (1), 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 circumferential surface (13) is the same as the diameter of the lower end of the outer circumferential surface (13), the longitudinal section of the inner core segment (21) is octagonal, and the longitudinal section of the outer ring segment (22) is trapezoidal.
3. The pile shoe of the degradable self-elevating drilling platform according to claim 1, wherein the pile shoe body (1) is detachably connected with the pile shoe (2) through a plurality of pins (3), the plurality of pins (3) are uniformly arranged along the circumference of the pile shoe (2) at intervals, a pin insertion hole is formed in the outer circumferential surface (13) of the pile shoe body (1), and a pin installation through hole is formed in the upper end of the outer ring section (22).
4. The degradable jack-up rig shoe according to claim 3, wherein when the predicted leg penetration depth into mud is small and pile pulling does not require pile shoe (2) release;
the number of the pins (3) is calculated by the formula:
when the depth of the pile leg entering the mud is predicted to be deeper and the pile shoe (2) needs to be released during pile pulling operation;
the number of the pins (3) is calculated by the formula:
l is the number of the pins (3) and is in units of one, and the reserved integer is rounded;
w is the gravity of the pile shoe (2) and the unit is N;
f is the soil adsorption force borne by the pile shoe (2) and the unit is N;
Fsthe unit of the soil body shearing force borne by the pile shoes (2) is N;
Frthe unit is N, and the unit is the soil body friction force borne by the pile shoes (2);
n is the shear strength of the pin (3) and has the unit of N/m2；
D is the diameter of the pin (3) and the unit is m;
n is a safety coefficient, has no unit and takes a value of more than or equal to 1.5.
5. The degradable jack-up rig shoe according to claim 3, further comprising a plurality of hauling ropes (43), wherein the number of the hauling ropes (43) is the same as the number of the pins (3), and the lower ends of the hauling ropes (43) are fixedly connected with the outer ends of the pins (3) in a one-to-one correspondence manner.
6. The pile shoe of the degradable jack-up rig according to claim 5, further comprising a straight pipe (45) and a plurality of inclined pipes (41), wherein 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).
7. The pile shoe of claim 6, wherein 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) is externally provided with an end fixed pulley (47), 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).
8. The degradable jack-up rig shoe according to claim 6, further comprising an upright truss (5), wherein the straight pipe (45) is sleeved in the truss (5), a plurality of in-pipe fixed pulleys (42) are arranged in the inclined pipe (41), a top fixed pulley (46) is arranged at the upper end of the truss (5), the traction rope (43) is connected with the in-pipe fixed pulley (42) and the top fixed pulley (46), the inclined pipe (41) is fixedly connected with the shoe body (1) through a support rod (44), and the straight pipe (45) is fixedly connected with the truss (5) through the support rod (44).
9. A drilling rig characterized in that the bottom of the drilling rig is provided with the degradable jack-up rig shoe of claim 1.
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| CN201920388657.8U CN209854712U (en) | 2019-03-26 | 2019-03-26 | Degradable self-elevating drilling platform pile shoe and drilling platform |
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| CN201920388657.8U CN209854712U (en) | 2019-03-26 | 2019-03-26 | Degradable self-elevating drilling platform pile shoe and drilling platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109868814A (en) * | 2019-03-26 | 2019-06-11 | 中国石油大学(北京) | A kind of degradable formula self-elevating drilling platform shoe and drilling platforms |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109868814A (en) * | 2019-03-26 | 2019-06-11 | 中国石油大学(北京) | A kind of degradable formula self-elevating drilling platform shoe and drilling platforms |
| CN109868814B (en) * | 2019-03-26 | 2024-02-02 | 中国石油大学(北京) | Degradable self-elevating drilling platform pile shoe and drilling platform |
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