CN113309096A - Directional piling method and sleeve - Google Patents
Directional piling method and sleeve Download PDFInfo
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- CN113309096A CN113309096A CN202110488280.5A CN202110488280A CN113309096A CN 113309096 A CN113309096 A CN 113309096A CN 202110488280 A CN202110488280 A CN 202110488280A CN 113309096 A CN113309096 A CN 113309096A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
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Abstract
The invention provides a directional piling method and a sleeve. The directional piling method comprises the following steps: the method comprises the following steps that (1) a casing is lowered into the sea, the casings which are connected in sequence form a casing group in the lowering process, the lower end face of a first casing is an inclined face which has a set inclination angle relative to an axis, and a generatrix where the lower end of the inclined face is located before entering mud faces a set direction; the sleeve pipe set is driven into mud, and the first sleeve pipe drives the sleeve pipe set to obliquely drive in towards the set direction under the action of the inclined plane. According to the directional piling method, in the process of descending the sleeve pipe set after the sleeve pipe set enters the mud, the first sleeve pipe can drive the sleeve pipe set to incline towards the set direction to descend under the action of the inclined plane, the incline direction of the sleeve pipe set is definitely limited through the inclined plane, namely the descending process of the sleeve pipe set after the sleeve pipe set enters the mud is oriented through the inclined plane, and therefore the sleeve pipe set is prevented from colliding with an adjacent well sleeve pipe set.
Description
Technical Field
The present disclosure relates to the field of oil production, and more particularly, to a method of directional piling and casing.
Background
Offshore platform cluster wells are a group of directional wells with a plurality of well heads concentrated in a limited range, and are key technologies for offshore oil field development, drilling and completion. With the enhancement of exploration and development strength at home and abroad, the problem that the drilling collision with the sleeve of the adjacent well often occurs because the number of wells of a group of directional wells is increased and the intervals among the wells are smaller and smaller.
At present, boreholes treated at home and abroad and prevented from being seriously collided all adopt a high bend angle motor to carry out pre-inclination treatment, and the boreholes are drilled after bypassing the well sections prevented from being seriously collided and replaced by conventional bend angle motors or are rotated and guided to carry out drilling. In the actual drilling process, if the well facing casing group deflects towards the well casing, if the well is normally hammered according to the normal position, and if the well facing casing group deflects in the hammering process, serious casing collision accidents are likely to happen.
Disclosure of Invention
The embodiment of the invention provides a directional piling method which can better avoid sleeve collision accidents.
The embodiment of the invention also provides a sleeve.
The directional piling method provided by the embodiment of the invention comprises the following steps: the method comprises the following steps that (1) a casing is lowered into the sea, the casings which are connected in sequence form a casing group in the lowering process, the lower end face of a first casing is an inclined face which has a set inclination angle relative to an axis, and a bus where the lower end of the inclined face is located faces a set direction before entering mud; and leading the sleeve pipe group to enter mud, and leading the first sleeve pipe to drive the sleeve pipe group to obliquely enter towards the set direction under the action of the inclined plane.
In an exemplary embodiment, when the mud penetration depth of the first casing is not greater than the set depth, the loaded connection torque force when the casing to be inserted is connected with the casing at the tail end of the casing set is prevented from driving the casing set to rotate so as to deviate the bus bar from the set direction.
In an exemplary embodiment, the step of preventing the loaded connection torque from driving the rotation of the cannula set when the cannula to be accessed is connected with the cannula at the end of the cannula set includes: the sleeve at the tail end of the sleeve group is fixed in the circumferential direction, and then the lower end of the sleeve to be connected is screwed to the upper end of the sleeve at the tail end of the sleeve group, so that the sleeve group is prevented from being driven to rotate by loaded connection torque force during connection.
In an exemplary embodiment, one of the lower end of the catheter to be accessed and the upper end of the cannula at the end of the cannula set is provided with an internal thread and the other is provided with an external thread.
In an exemplary embodiment, the step of fixing the sleeve at the end of the sleeve set in the circumferential direction, and then screwing the lower end of the sleeve to be inserted to the upper end of the sleeve at the end of the sleeve set, so as to prevent the sleeve set from being driven to rotate by the connection torque loaded during connection includes: the method comprises the steps of firstly fixing a sleeve at the tail end of a sleeve group in the circumferential direction, then loosening an elevator for lowering the sleeve group, then screwing the lower end of the sleeve to be connected to the upper end of the sleeve at the tail end of the sleeve group, so that the loaded connection torque force during connection is prevented from driving the sleeve group to rotate, then enabling the elevator to tightly grasp the upper end of the sleeve group, then releasing the sleeve group in the circumferential direction, and then continuing to lower the sleeve group through the elevator.
In an exemplary embodiment, the set depth is not less than 2-3 m.
In an exemplary embodiment, the step of cementing the casing string comprises: the sleeve pipe set is firstly put into the mud through self weight, and then is put down to the set mud-entering depth position through piling.
In an exemplary embodiment, at least two setting positions ensure that the generatrix on which the lower end of the ramp is located is oriented in a setting direction.
In an exemplary embodiment, the set position comprises a drill floor, a first deck and a second deck which are spaced from each other from top to bottom, the set inclination angle is 45-75 degrees, and the casing pipe group is inclined towards the set direction by an angle not larger than 4 degrees/30 m.
According to the sleeve provided by the embodiment of the invention, the end face of one end of the sleeve is an inclined plane inclined by 45-75 degrees relative to the axis, and the other end of the sleeve is provided with the connecting part.
In an exemplary embodiment, the connection portion is an internal thread or an external thread.
The first sheathed tube of conventional thimble group's lower terminal surface thinking inertia sets up to the plane, and the theoretical state thimble group is gone into perpendicularly after mud and is gone into, and the actual thimble group goes into the in-process after going into mud, because of the geological hardness difference that first sheathed tube lower terminal surface received in different positions, first sleeve pipe just also can not confirm in the crooked direction of different positions like this, this also with close on the thimble group and take place the leading reason of sleeve pipe collision accident easily. The inventor of the invention breaks away from the restriction of thinking inertia, sets the lower end surface of the first casing to be an inclined surface with a set inclined angle relative to the axis, and carries out directional deflection on the casing in the process of running in after the casing is grouted by the inclined surface so as to prevent the casing from colliding with the well-facing casing group.
According to the directional piling method provided by the embodiment of the invention, in the process of putting the casing pipe group in the mud, the first casing pipe can drive the casing pipe group to obliquely put in towards the set direction under the action of the inclined plane, the oblique direction of the casing pipe group is definitely limited through the inclined plane, namely, the putting-in process of the casing pipe group in the mud is oriented through the inclined plane, so that collision with the adjacent well casing pipe group is avoided.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings 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 example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic cross-sectional structural view of a bushing according to an embodiment of the present invention.
Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:
100 casing, 110 bevel, 120 joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The directional piling method (not shown in the figure) provided by the embodiment of the invention comprises the following steps: the method comprises the following steps that (1) a casing is lowered into the sea through an elevator, the casing which is connected in sequence in the lowering process forms a casing group, the lower end face of a first casing is an inclined face with a set inclination angle relative to an axis, and a bus where the lower end of the inclined face is located before entering mud faces a set direction; the sleeve pipe set is driven into mud, and the first sleeve pipe drives the sleeve pipe set to obliquely drive in towards the set direction under the action of the inclined plane.
The first sheathed tube of conventional thimble group's lower terminal surface thinking inertia sets up to the plane, and the theoretical state thimble group is gone into perpendicularly after mud and is gone into, and the actual thimble group goes into the in-process after going into mud, because of the geological hardness difference that first sheathed tube lower terminal surface received in different positions, first sleeve pipe just also can not confirm in the crooked direction of different positions like this, this also with close on the thimble group and take place the leading reason of sleeve pipe collision accident easily. The inventor of the invention breaks away from the restriction of thinking inertia, sets the lower end surface of the first casing to be an inclined surface with a set inclined angle relative to the axis, and carries out directional deflection on the casing in the process of running in after the casing is grouted by the inclined surface so as to prevent the casing from colliding with the well-facing casing group.
According to the directional piling method, in the process of descending the sleeve pipe set after the sleeve pipe set enters the mud, the first sleeve pipe can drive the sleeve pipe set to incline towards the set direction to descend under the action of the inclined plane, the incline direction of the sleeve pipe set is definitely limited through the inclined plane, namely the descending process of the sleeve pipe set after the sleeve pipe set enters the mud is oriented through the inclined plane, and therefore the sleeve pipe set is prevented from colliding with an adjacent well sleeve pipe set.
In an exemplary embodiment, when the mud penetration depth of the first casing is not greater than the set depth, the loaded connection torque force when the casing to be inserted is connected with the casing at the tail end of the casing set is prevented from driving the casing set to rotate so as to enable the bus bar to deviate from the set direction.
When the mud degree of depth is not more than the settlement degree of depth to first sleeve pipe income, the frictional force between geology and the thimble group is than less, when the thimble is organized to the thimble group upper end access, need prevent to treat that the sleeve pipe of inserting and the terminal sleeve pipe of thimble group from carrying out the loaded connection torque drive thimble group rotation when being connected, avoid the generating line skew to set for the direction, guarantee that the thimble group is transferring the in-process and carry out the skew along setting for the direction. A plurality of convex ribs can also be vertically arranged on the outer side surface of the first sleeve at intervals along the circumferential direction, so that the friction force between the first sleeve and the geology is increased, and the numerical value of the set depth is smaller. When the mud penetration depth of the first sleeve is greater than the set depth, the friction force between the geology and the sleeve group is greater than the loaded connection torsion force.
For example, the step of preventing the loaded connection torque from driving the rotation of the cannula set when the cannula to be inserted is connected with the cannula at the end of the cannula set includes: the sleeve at the tail end of the sleeve group is fixed in the circumferential direction, and then the lower end of the sleeve to be connected is screwed to the upper end of the sleeve at the tail end of the sleeve group, so that the sleeve group is prevented from being driven to rotate by loaded connection torque force during connection.
For example, the step of fixing the sleeve at the end of the sleeve set in the circumferential direction and then screwing the lower end of the sleeve to be inserted to the upper end of the sleeve at the end of the sleeve set to prevent the loaded connection torque from driving the sleeve set to rotate during connection includes: the method comprises the steps of firstly fixing a sleeve at the tail end of a sleeve group in the circumferential direction, then loosening an elevator for lowering the sleeve group, then enabling the lower end of the sleeve to be connected to be screwed at the upper end of the sleeve at the tail end of the sleeve group, so as to avoid the situation that the sleeve group is driven to rotate by a connecting torsion loaded during connection, enabling the elevator to tightly grasp the upper end of the sleeve group (tightly grasp the upper end of the sleeve which is just connected), then releasing the sleeve group in the circumferential direction, and then continuing to lower the sleeve group through the elevator.
Wherein, be provided with the internal thread on one of the lower extreme of the pipe of treating the grafting and the sheathed tube upper end of the terminal cover pipe of cover pipe group, be provided with the external screw thread on another, the lower extreme of the pipe of treating the grafting and the terminal sheathed tube upper end of cover pipe group carry out the screw joint through internal thread and external screw thread.
For example, the set depth is not less than 2-3 m, and may be 2m, 3m, or 4m, etc., and those skilled in the art may perform reasonable setting according to actual needs by combining with geological conditions, which is not limited herein.
In an exemplary embodiment, the step of cementing the casing string comprises: the thimble group goes into mud through the dead weight earlier, and the rethread pile is transferred and is set for into mud degree of depth position, and the pile driving can be pushing down or hammering etc..
In an exemplary embodiment, at least two setting positions ensure that the generatrix on which the lower end of the inclined surface is located is oriented in the setting direction, which avoids the problem of the generatrix on which the lower end of the inclined surface is located deviating from the setting direction.
Illustratively, the set position includes a drill floor, a first deck (which may be a BOP blowout preventer deck) and a second deck (which may be an 18.5m deck) spaced from above and below, with three positions to ensure that the generatrix on which the lower end of the ramp is located is oriented in the set direction.
Illustratively, the inclination angle is set to be 45-75 degrees, so that the inclination angle of the sleeve pipe group towards the set direction is not more than 4 degrees/30 m.
The purpose of the present application can be achieved by setting the inclination angle to 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, or 75 degrees, etc., and the purpose thereof does not depart from the design concept of the present invention, and therefore, the present application shall fall within the protection scope of the present application without being repeated herein.
The directional piling method may specifically include:
firstly, confirming the construction orientation (set direction) of the directional pile on a drill floor, a first deck and a second deck;
secondly, marking a bus where the lower end of the first sleeve is located;
thirdly, lowering the casing pipe to the sea, wherein a bus at the lower end of the first casing pipe faces the construction position of the directional pile when the drill floor is used, when the casing pipe is connected to the upper end of the casing pipe group, the casing pipe at the tail end of the casing pipe group is fixed in the circumferential direction, then an elevator for lowering the casing pipe group is loosened, the lower end of the casing pipe to be inserted is screwed to the upper end of the casing pipe at the tail end of the casing pipe group, then the elevator tightly grips the upper end of the casing pipe group (namely the upper end of the casing pipe which is just inserted), then the casing pipe group is released in the circumferential direction, and then the casing pipe group is continuously lowered through the elevator;
when the first casing pipe is lowered to the first deck, the bus where the lower end of the first casing pipe is located is ensured to face the construction position of the directional pile on the first deck and the drill floor;
when the first casing pipe is lowered to the second deck and is placed in mud, the construction position of the directional pile is ensured to be oriented by the bus where the lower end of the first casing pipe is located on the second deck, the first deck and the drill floor;
finally, the sleeve pipe set is firstly subjected to mud entering through self weight, and then is lowered to a set mud entering depth position through piling; after the mud depth of the sleeve group is greater than the set depth, the sleeve to be connected is directly screwed on the sleeve at the tail end of the sleeve group (at the moment, the friction force between the geology and the sleeve group is greater than the loaded connection torsion), and the sleeve at the tail end of the sleeve group is not required to be fixed in the circumferential direction to prevent the sleeve group from rotating.
Item one: B26H well
Before implementation: in the early piling process of the riser of the B23H well, due to stratum and pile group effect and the like, the inclination angle of a pile shoe reaches 3.64 degrees, the offset displacement is 2.66m and exceeds the distance between the notches, the offset direction just passes through the position right below the B26H well, anti-collision scanning is carried out through directional well professional software, and the distance between the two wells is only 0.01m at 203 m. The riser pipe diameter is 51cm, which means that the two well riser pipes have been seamlessly coincident. If the pile pipe of the B26H well is directly hammered into the seabed according to the design standard, the riser pipe of the two wells can not be collided. Once the pipes collide with each other, the riser cannot be hammered into the designed depth, and cannot provide enough supporting force for the subsequent 13-3/8in casing and 9-5/8in casing, and finally the well slot is scrapped, and the loss is tens of millions.
After the implementation: according to the calculation of professional anti-collision software, the B26H well riser pipe deflects more than 3 degrees along the direction of 70 degrees, after 207m, the inclined angle of the inclined plane of the riser pipe is set to 70 degrees with two wells, and the depth of the riser pipe hammered into the mud line is as follows: 207.25 m. After the conduit pile driving is finished, a gyroscope is put in for verification, and the well deviation data of the conduit hammered in is measured: the depth (205m), the well deviation (6.21 degrees) and the azimuth (114.08 degrees) are measured, the distance between two wells at the depth of 205m is calculated to be 4.43m, which is much larger than the distance of 0.01m predicted by the technology without using the directional pile, and the collision prevention risk is completely eliminated.
Item two: B31H well
Before implementation: a platform is planned to be used for a SLOT10# notch well B31H, three wells such as B06H, B13H and B29H drilled in the early stage are arranged in a shallow layer close to the well, the collision prevention position is in a range of 260-360 degrees, the distance is 0.15-3.20 m, B13H directly penetrates through the notch position of the B31H well at the well depth 218m, the depth of a guide pipe on the surface layer of the B31H well is about 205m, namely, if a conventional guide pipe pile driving and hammering technology is adopted, when a next 16 'well section is drilled, the guide pipe drilling 13m is required to avoid the B13H well, even if a large-bending-angle motor is used for full-force drilling to cause inclined obstacle crossing, the guide pipe is drilled according to the maximum construction slope of 5 degrees/30 m, only 0.25m displacement of less than 0.4m (16' outer diameter of the guide pipe) can be drilled, and the collision prevention obstacle crossing cannot be completed at all.
After the implementation: according to the calculation of professional anti-collision software, if the B31H well riser pipe is deviated to 3 degrees along the 45-degree direction at the well depth of 209m, the nearest distance to the B13H well at the well depth of 198m is 0.86m ≈ 2 × 0.40m (2 outer diameters of 16' pipes). Using the directional pile technology to pile and hammer into the guide pipe, wherein the depth of the guide pipe hammering into the mud line is as follows: 209m, setting the casing bevel inclination angle: and (4) at 45 degrees, after the pile is driven, putting a gyroscope down for verification, and measuring the well deviation data of the hammering guide pipe: the depth (206m), the well deviation (3.46 degrees) and the azimuth (113.47 degrees) are measured, the distance between the depth of 191m and two wells of a B13H well is 1.01m according to the calculation, the pile driving hammering process has no abnormal condition, the anti-collision obstacle avoidance of the guide pipe well section is smoothly completed, and meanwhile the anti-collision distance between the subsequent well section and the B29H well is increased from 1.30m to more than 3 m.
Item three: A25H well
Before implementation: 2 notches are arranged in the platform in a planned-to-be-encrypted mode, wherein a notch is provided with a notch A25H, three shallow wells such as A5H, A13H and A19H which are drilled at the previous stage are close to the notch, the anti-collision direction is within the range of 220-360-90 degrees, the distance between the notch and the A5H well is 0.72m at the position of 175m of the notch, the distance between the notch and the A13H well is 0.77m at the position of 180m of the notch, the distance between the notch and the A19H well is 1.19m at the position of 214m of the notch, and the anti-collision situation is severe. By adopting a conventional guide pipe piling and hammering technology, according to the design, the hammering depth of the guide pipe is 200m, if the guide pipe slants to the collision-proof azimuth range, the guide pipe can collide with the guide pipe of the adjacent well or enter a surrounding ring at the north side of the collision-proof adjacent well, if the obstacle is required to be detonated, the obstacle can be detonated from the depth only by deepening a deflecting point, if the shallow deflecting design of the A25H well reaches 4.1 degrees/30 m, the shallow deflecting pressure can be greatly increased if the deflecting point is deepened, and meanwhile, in the vertical drilling process of the deepened deflecting point, the great risk of collision with the adjacent well still exists.
After the implementation: according to the calculation of professional anti-collision software, if the A25H well riser pipe is deviated to 3 degrees along the direction of 65 degrees at the well depth of 200m, the risk of collision with the A5H and A13H wells at 200m and shallow pipe sections is avoided, and the anti-collision between the subsequent well sections and the A19H well is improved. Using the directional pile technology to pile and hammer into the guide pipe, wherein the depth of the guide pipe hammering into the mud line is as follows: 140.6m-199.8m, and the inclined angle of the inclined plane of the sleeve is set as follows: and (5) at 65 ℃, after the pile is driven, putting a gyroscope for verification, and measuring the well deviation data of the hammering guide pipe: the depth measurement (185m), the well deviation (1.64 degrees) and the azimuth (170.2 degrees) are calculated, the collision prevention risks with the A5H well and the A13H well are basically eliminated, and the distance between the subsequent well section at 223m and the A19H well is 1.51m, which is also relieved compared with the originally designed 1.19m collision prevention pressure.
Item four: A24H well
Before implementation: 2 notches are arranged in the platform in a quasi-encrypted way, wherein a notch well A24H is distributed, and the collision prevention pressure mainly comes from wells A16H, A3H and the like, and is 0.87m away from A16H at 240m, 1.69m away from 228m and A3H wells, and 4.31m away from 560m and A16H wells. By adopting the conventional guide pipe piling and hammering technology, the hammering depth of the guide pipe is 200m according to design, the upper well section slope rate needs 4.1 degrees/30 m, and if the directional pile pre-inclining technology is adopted, the upper well section slope rate and the anti-collision pressure are reduced.
After the implementation: according to the calculation of professional anti-collision software, if the directional pile technology is used, the A24H well riser pipe deflects to 3 degrees along the 45-degree direction at the well depth of 200m, so that the method is favorable for eliminating the risk of anti-collision of the well shallow layer and relieving the deflecting pressure of the upper well section. Using the directional pile technology to pile and hammer into the guide pipe, wherein the depth of the guide pipe hammering into the mud line is as follows: 140.6m-199.8m, and the inclined angle of the inclined plane of the sleeve is set as follows: and (4) at 45 degrees, after the pile is driven, putting a gyroscope down for verification, and measuring the well deviation data of the hammering guide pipe: the depth measurement (183m), the well deviation (3.46 degrees) and the azimuth (319.07 degrees) are calculated, and the subsequent track is predicted, the distance between the 199.8m pipe shoe and the closer 4 wells is more than 4m, and the distance is farther and farther along with the increase of the well depth, so that the collision prevention risk is basically eliminated.
As shown in fig. 1, an end face of one end of the sleeve 100 provided by the embodiment of the present invention is an inclined surface 110 inclined by 45 to 75 degrees with respect to an axis, and the other end of the sleeve is provided with a connecting portion 120, where the connecting portion 120 is an internal thread or an external thread, and the sleeve 100 is the first sleeve in the above embodiments.
A casing pipe with the diameter of 24in, the wall thickness of 1in and the inclined plane inclination angle of about 65 degrees is applied to two wells for casing pipe setting, when 57 m mud enters, the casing pipe groups of the two wells incline towards the set direction, and the inclined angles are 3.4 degrees and 6.2 degrees.
A casing with the diameter of 20in, the wall thickness of 1in and the inclined plane inclination angle of about 65 degrees is applied to two wells for casing running. When the mud enters 60 meters, the casing pipe sets of the two wells deflect towards the set direction, and the deflection angles are 3.4 degrees and 1.64 degrees.
The sleeve 100 provided by the application is matched with a conventional sleeve for use, so that the collision between the sleeve group and the adjacent well sleeve group can be avoided.
In summary, in the directional piling method provided in the embodiment of the present invention, in the process of dropping the casing pipe set after mud entering, the first casing pipe drives the casing pipe set to obliquely drop toward the set direction under the action of the inclined plane, and the inclined direction of the casing pipe set is clearly defined through the inclined plane, that is, the dropping process of the casing pipe set after mud entering is oriented through the inclined plane, so as to avoid collision with the adjacent well casing pipe set.
In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of directional piling, comprising:
the method comprises the following steps that (1) a casing is lowered into the sea, the casings which are connected in sequence form a casing group in the lowering process, the lower end face of a first casing is an inclined face which has a set inclination angle relative to an axis, and a bus where the lower end of the inclined face is located faces a set direction before entering mud;
and leading the sleeve pipe group to enter mud, and leading the first sleeve pipe to drive the sleeve pipe group to obliquely enter towards the set direction under the action of the inclined plane.
2. A directional piling method according to claim 1 wherein when the depth of the leading casing into the mud is not greater than the set depth, the torque applied to the connection when the casing to be spliced into is connected to the casing at the end of the casing string is prevented from driving the casing string in rotation to deflect the busbar from the set orientation.
3. A method of directional piling according to claim 2 wherein the step of preventing a connecting torque force applied when connecting the casing to be spliced into the casing at the end of the casing string from driving the casing string in rotation comprises:
the sleeve at the tail end of the sleeve group is fixed in the circumferential direction, and then the lower end of the sleeve to be connected is screwed to the upper end of the sleeve at the tail end of the sleeve group, so that the sleeve group is prevented from being driven to rotate by loaded connection torque force during connection.
4. A method as claimed in claim 3, wherein the lower end of the pipe to be spliced into and the upper end of the casing at the end of the casing set are internally threaded one and externally threaded the other.
5. A method as set forth in claim 3, wherein the step of preventing the torsional loading of the connection from driving the sleeve assembly to rotate comprises the steps of circumferentially securing the sleeve at the end of the sleeve assembly and tightening the lower end of the sleeve to be inserted onto the upper end of the sleeve at the end of the sleeve assembly:
the method comprises the steps of firstly fixing a sleeve at the tail end of a sleeve group in the circumferential direction, then loosening an elevator for lowering the sleeve group, then screwing the lower end of the sleeve to be connected to the upper end of the sleeve at the tail end of the sleeve group, then enabling the elevator to tightly grasp the upper end of the sleeve group, so as to avoid the phenomenon that the sleeve group is driven to rotate by the loaded connection torsion force during connection, then releasing the sleeve group in the circumferential direction, and then continuing to lower the sleeve group through the elevator.
6. A directional piling method according to claim 2 wherein said set depth is not less than 2 to 3 m.
7. A method of directional piling according to claim 1 wherein said step of cementing a casing set comprises:
the sleeve pipe set is firstly put into the mud through self weight, and then is put down to the set mud-entering depth position through piling.
8. A method for directional piling according to claim 1, wherein at least two setting positions ensure that a generatrix on which a lower end of said inclined surface is located is oriented in a setting direction.
9. The directional piling method according to claim 8 wherein the set position includes the drill floor, the first deck and the second deck spaced from the top to the bottom, the set inclination angle is 45-75 degrees, and the casing pipe set is inclined toward the set direction by an angle of not more than 4 degrees/30 m.
10. The sleeve is characterized in that the end face of one end of the sleeve is an inclined face inclined by 45-75 degrees relative to an axis, and a connecting portion is arranged at the other end of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110488280.5A CN113309096A (en) | 2021-05-06 | 2021-05-06 | Directional piling method and sleeve |
Applications Claiming Priority (1)
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| CN116289943A (en) * | 2023-05-10 | 2023-06-23 | 西南石油大学 | Pile driving cap structure of marine drilling platform riser and pile driving method thereof |
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