阅读说明：本技术 用于钻井隔水管的软悬挂装置及其操作方法 (Flexible suspension device for drilling riser and operation method thereof ) 是由 李中 王金龙 许亮斌 盛磊祥 刘健 李朝玮 李梦博 于 2021-09-16 设计创作，主要内容包括：本发明涉及一种用于钻井隔水管的软悬挂装置及其操作方法,该装置包括如下部件：液压减震系统,包括液压缸和装配于所述液压缸中的中空活塞杆,所述中空活塞杆将所述液压缸划分为有杆腔和无杆腔,所述中空活塞杆内设置有空腔；悬挂短节系统,包括悬挂短节、顶部悬挂机构和铰接接头,所述铰接接头装配于所述悬挂短节的下端,用于与隔水管连接,所述悬挂短节穿过所述中空活塞杆的空腔后,其上端通过所述顶部悬挂机构与所述中空活塞杆连接。该装置在悬挂短节的下端装配铰接接头,铰接接头由互为90度的两个销轴的万向节组成,可实现水平面360度的自由旋转,隔水管可绕其旋转,以达到释放隔水管所承受的弯矩载荷的目的。(The invention relates to a soft suspension device for a drilling riser and an operation method thereof, wherein the device comprises the following components: the hydraulic damping system comprises a hydraulic cylinder and a hollow piston rod assembled in the hydraulic cylinder, wherein the hydraulic cylinder is divided into a rod cavity and a rodless cavity by the hollow piston rod, and a cavity is arranged in the hollow piston rod; hang nipple joint system, including hanging nipple joint, top suspension mechanism and articulated joint, articulated joint assemble in hang the lower extreme of nipple joint for be connected with the marine riser, hang the nipple joint and pass behind the cavity of cavity piston rod, its upper end passes through top suspension mechanism with the cavity piston rod is connected. The device is at the lower extreme assembly articulated joint of hanging the nipple joint, and articulated joint comprises the universal joint of two round pin axles that are 90 degrees each other, can realize 360 degrees free rotations in horizontal plane, and the riser can be around its rotation to reach the purpose of the moment of flexure load that the release riser bore.)

1. A soft suspension for a drilling riser, comprising the following components:

the hydraulic damping system comprises a hydraulic cylinder (2-2) and a hollow piston rod (2-1) assembled in the hydraulic cylinder (2-2), wherein the hydraulic cylinder (2-2) is divided into a rod cavity and a rodless cavity by the hollow piston rod (2-1), and a cavity is arranged in the hollow piston rod (2-1);

hang nipple joint system (1), including hanging nipple joint (1-1), top suspension mechanism (1-2) and articulated joint (1-5), articulated joint (1-5) assemble in hang the lower extreme of nipple joint (1-1) for be connected with marine riser (6), hang nipple joint (1-1) and pass behind the cavity of cavity piston rod (2-1), its upper end pass through top suspension mechanism (1-2) with cavity piston rod (2-1) is connected.

2. The soft suspension device according to claim 1, wherein the top and middle of the suspension short section (1-1) are equal-diameter pipes, the bottom of the suspension short section (1-1) is a tapered tubular stress short section structure, and the bottom of the suspension short section (1-1) is provided with a clamping groove extending along the circumferential direction of the suspension short section.

3. The soft suspension device according to claim 2, wherein the suspension sub system (1) further comprises a centering mechanism (1-3), and the centering mechanism (3) is sleeved in the clamping groove.

4. The soft suspension device according to claim 3, wherein the centering mechanism (1-3) is a two-piece symmetrical semi-cylindrical structure, and the two-piece semi-cylindrical structure is sleeved in the clamping groove and is fastened and connected through a screw.

5. The soft suspension device according to claim 1, wherein the top suspension mechanism (1-2) is composed of two semicircular clamping rings, the two semicircular clamping rings are sleeved at the upper end of the suspension short section (1-1) and are fastened at the top end of the hollow piston rod (2-1) through screws.

6. The soft suspension arrangement according to claim 1, characterized in that the articulated joint (1-5) consists of two pin-and-socket joints at 90 degrees to each other, which allow a free rotation of 360 degrees in the horizontal plane.

7. The soft suspension device according to claim 3, wherein the suspension sub system (1) further comprises an anti-wear bushing (1-4), the anti-wear bushing (1-4) is assembled at the lower end of the hydraulic cylinder (2-2) and sleeved at the lower end of the suspension sub (1-1), the anti-wear bushing (1-4) is of a cylindrical structure, the outer wall surface of the anti-wear bushing is in contact with the inner wall surfaces of the drill floor (4) and the rotary jet casing (5), and the inner wall surface of the anti-wear bushing is in contact with the outer wall surface of the centering mechanism (3).

8. The soft suspension device according to claim 1, characterized in that the outer wall of the hydraulic cylinder (2-2) is provided with a boss which is clamped on a chuck (3) of a drill floor (4).

9. The soft suspension arrangement according to claim 1, wherein the hydraulic damping system further comprises a hydraulic control system (2-3), the hydraulic control system (2-3) being connected to the hydraulic cylinder (2-2) for controlling the flow and pressure of the hydraulic cylinder (2-2).

10. A method of operating a soft suspension as claimed in any one of claims 1 to 9, comprising the steps of:

disconnecting the marine riser (6) in the connected state from the submarine equipment, lifting a throwing part of the marine riser (6) to a preset hanging length by using a large hook of a drilling platform, and seating the upper end of the marine riser (6) on a chuck (3) of a drill floor (4);

the method comprises the steps that the soft suspension device which is assembled off line is hoisted to the position of a drill floor, the hinged joint (5) is connected with the upper end of the marine riser (6), the soft suspension device and the marine riser (6) which are connected are placed downwards until the boss on the outer wall of the hydraulic cylinder (2-2) is connected to the chuck (3), and suspension of the marine riser (6) is completed.

Technical Field

The invention relates to a soft suspension device for a drilling riser and an operation method thereof, belonging to the technical field of offshore oil engineering and drilling and production.

Background

In deepwater drilling operation, a drilling riser is an important channel for connecting a seabed wellhead with a sea surface operation platform, and is important equipment for deepwater oil and gas exploration and development. When the marine riser encounters severe weather or working conditions (such as typhoon and strong internal wave flow), the drilling platform needs to be evacuated urgently, and the safety of personnel and equipment is ensured. The conventional platform avoiding scheme commonly used at present is that the platform is released and sails to a safe area after all marine risers are recovered, and after environmental conditions allow, the marine risers need to be lowered again to restart drilling operation. This situation is extremely inefficient and results in increased periods of non-operation and thus increased drilling costs. Another approach to avoid the platform is to hang and avoid the platform. When the platform encounters emergency typhoon weather, part of the marine riser is recovered by the platform, the marine riser which is not recovered is hung on the platform chuck, and the marine riser and the in-situ anti-typhoon or the marine riser sail together with the platform are evacuated to a safe area. The scheme can prolong the drilling operation time and has certain advantages compared with the conventional method for recovering all the marine risers. The scheme is used as a standby scheme in an emergency state (particularly under a typhoon working condition), certain safety risk exists, the suspended marine riser can collide with the shell of the rotary sprayer, and the conventional marine riser is easy to damage due to overlarge load under a severe environment. Due to the fact that no special strengthening measures are provided, the adaptability of the suspended marine riser to severe environments is limited.

Disclosure of Invention

The invention provides a soft suspension device for a drilling riser and an operation method thereof, wherein a hinged joint is assembled at the lower end of a suspension short section, the hinged joint is composed of universal joints of two pin shafts which are 90 degrees, 360-degree free rotation in the horizontal plane can be realized, and the riser can rotate around the hinged joint, so that the aim of releasing bending moment load borne by the riser is fulfilled.

In order to achieve the purpose, the invention adopts the following technical scheme:

a soft suspension for a drilling riser comprising the following components:

the hydraulic damping system comprises a hydraulic cylinder and a hollow piston rod assembled in the hydraulic cylinder, wherein the hydraulic cylinder is divided into a rod cavity and a rodless cavity by the hollow piston rod, and a cavity is arranged in the hollow piston rod;

hang nipple joint system, including hanging nipple joint, top suspension mechanism and articulated joint, articulated joint assemble in hang the lower extreme of nipple joint for be connected with the marine riser, hang the nipple joint and pass behind the cavity of cavity piston rod, its upper end passes through top suspension mechanism with the cavity piston rod is connected.

The soft suspension device is characterized in that the top and the middle of the suspension short section are equal-diameter pipes, the bottom of the suspension short section is a tapered tubular stress short section structure, and a clamping groove extending along the circumferential direction of the bottom of the suspension short section is formed in the bottom of the suspension short section.

The soft suspension device preferably further comprises a centering mechanism, and the centering mechanism is sleeved in the clamping groove.

The soft suspension device is preferably characterized in that the centering mechanism is a semi-cylindrical structure symmetrically arranged with two petals, and the semi-cylindrical structure is sleeved in the clamping groove and is fastened and connected through a screw.

The soft suspension device is characterized in that the top suspension mechanism is composed of two semicircular clamping rings, the two semicircular clamping rings are sleeved at the upper end of the suspension short section and fastened at the top end of the hollow piston rod through screws.

The soft suspension device preferably comprises two pin-shaft universal joints which are 90 degrees to each other, and can realize 360-degree free rotation in the horizontal plane.

The soft suspension device preferably further comprises an abrasion-proof bushing, the abrasion-proof bushing is assembled at the lower end of the hydraulic cylinder and sleeved at the lower end of the suspension short section, the abrasion-proof bushing is of a cylindrical structure, the outer wall surface of the abrasion-proof bushing is in contact with the inner wall surfaces of the drill floor and the rotary sprayer shell, and the inner wall surface of the abrasion-proof bushing is in contact with the outer wall surface of the centering mechanism.

The soft suspension device is preferably provided with a boss on the outer wall of the hydraulic cylinder, and the boss is clamped on a chuck of the drill floor.

The soft suspension device preferably further comprises a hydraulic control system, and the hydraulic control system is connected with the hydraulic cylinder and used for controlling the flow and the pressure of the hydraulic cylinder.

Based on the operation method of the soft suspension device, the invention also provides an operation method of the device, which comprises the following steps:

disconnecting the marine riser in the connection state from the subsea equipment, lifting and throwing the marine riser to a preset hanging length by using a large hook of the drilling platform, and positioning the upper end of the marine riser on a chuck of a drill floor;

and hoisting the off-line assembled soft suspension device to the position of a drill floor, connecting the hinged joint with the upper end of the marine riser, and lowering the soft suspension device and the marine riser until the boss on the outer wall of the hydraulic cylinder is clamped on the chuck to complete the suspension of the marine riser.

Due to the adoption of the technical scheme, the invention has the following advantages:

1. the bottom of the suspension short section in the device adopts a stress short section structure form of a tapered pipe, and can bear large transverse load generated by wave ocean current.

2. According to the device, the clamping groove is formed in the conical tube at the lower end of the hanging short section, the contrast mechanism is sleeved in the clamping groove, the centering mechanism is used for centering the hanging short section, and the centering mechanism transmits the transverse load borne by the hanging short section to the shell of the rotary sprayer through the anti-abrasion bushing, so that the hanging short section can reciprocate up and down in the hollow piston rod of the hollow hydraulic cylinder, and the bending load is not transmitted to the hydraulic cylinder.

3. The anti-abrasion bushing in the device is used for protecting the sealing surface of the rotary sprayer shell, preventing the abrasion of the sealing surface, is matched with the centering mechanism, transfers the transverse load transferred from the bottom end of the suspended short section to the rotary sprayer shell, and can inhibit the transverse deformation of the suspended short section in the hollow piston rod.

4. According to the device, the hinged joint is assembled at the lower end of the hanging short section and consists of universal joints of two pin shafts which are 90 degrees with each other, 360-degree free rotation of a horizontal plane can be achieved, and the marine riser can rotate around the marine riser, so that the aim of releasing bending moment load borne by the marine riser is fulfilled.

Drawings

FIG. 1 is a schematic view of a hollow piston rod soft suspension device in a fully extended state according to an embodiment of the present invention;

FIG. 2 is a schematic view of the soft suspension of the hollow piston rod of FIG. 1 in a fully retracted state;

FIG. 3 is a schematic view of the top suspension mechanism of FIG. 1, wherein a is a front view and b is a top view;

FIG. 4 is a top view of the centering mechanism of FIG. 1;

the respective symbols in the figure are as follows:

1-hanging a short section system, 1-1-hanging a short section, 1-2-top hanging mechanism, 1-3 centering mechanism, 1-4 anti-abrasion bush and 1-5-hinged joint; 2-1-a hollow piston rod, 2-2-a hydraulic cylinder and 2-3-a hydraulic control system; 3-a chuck; 4-a drill floor; 5-rotating the sprayer housing; 6-marine riser.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the terms "first," "second," "third," "fourth," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As shown in fig. 1 and 2, the present invention provides a soft suspension device for a drilling riser, comprising the following components: the hydraulic damping system comprises a hydraulic cylinder 2-2 and a hollow piston rod 2-1 assembled in the hydraulic cylinder 2-2, wherein a hollow structure is arranged in the hollow piston rod 2-1; the suspended short section system 1 comprises a suspended short section 1-1, a top suspension mechanism 1-2 and a hinged joint 1-5, wherein the hinged joint 1-5 is assembled at the lower end of the suspended short section 1-1 and used for being connected with a marine riser 6, and after the suspended short section 1-1 penetrates through a cavity of a hollow piston rod 2-1, the upper end of the suspended short section is connected with the upper end face of the hollow piston rod 2-1 through the top suspension mechanism 1-2. The anti-abrasion bushing 1-4 in the device is used for protecting the sealing surface of the rotary sprayer shell 5 and preventing the sealing surface from being abraded, is matched with the centering mechanism 1-3, transmits the transverse load transmitted from the bottom end of the hanging short section 1-1 to the rotary sprayer shell 5, and can inhibit the transverse deformation of the hanging short section 1-1 in the hollow piston rod 2-1.

As shown in fig. 1 and 2, the present invention provides a soft suspension device for a drilling riser, comprising: a suspension nipple system 1 and a hydraulic damping system. The hanging short section system 1 comprises a hanging short section 1-1, a top hanging mechanism 1-2, a centering mechanism 1-3, an anti-abrasion bush 1-4 and a hinged joint 1-5. The hydraulic compensation system 2 comprises a hollow piston rod 2-1, a hydraulic cylinder 2-2 and a hydraulic control system 2-3. The bottom of the suspension short section 1-1 adopts a stress short section structure form of a tapered pipe, and can bear large transverse load generated by wave ocean current, and the tail end of the tapered pipe is provided with a hinged joint 1-5; the top and the middle of the hanging short section 1-1 are designed into a constant diameter pipe, the top of the hanging short section is provided with a top hanging mechanism 1-2, the top hanging mechanism 1-2 is connected with the top of a hollow piston rod 2-1, and the hanging short section is used for bearing the high axial load of a drilling riser 6 and transmitting the high axial load to the hollow piston rod 2-1 of a hydraulic damping system; a clamping groove is formed in the conical tube at the bottom of the hanging short section 1-1, and the two-flap type centering mechanism 1-3 is fixed in the clamping groove of the hanging short section 1-1 through a bolt. The centering mechanism 1-3 is used for righting the suspended short section 1-1, and the centering mechanism 1-3 transmits the transverse load borne by the suspended short section 1-1 to the rotary sprayer shell 5 through the anti-abrasion bushing 1-4, so that the suspended short section 1-1 can reciprocate up and down in the hollow piston rod 1-2 of the hollow hydraulic cylinder 2-2, and the bending load is not transmitted to the hydraulic cylinder 2-2. The anti-abrasion bushing 1-4 is sleeved at the lower end of the hanging short section 1-1, assembled at the bottom of the hydraulic cylinder 2-2 and contacted with the drill floor 4 and the rotary sprayer shell 5, the anti-abrasion bushing 1-4 is mainly used for protecting the sealing surface of the rotary sprayer shell 5 to prevent the wear of the sealing surface and matched with the centering mechanism 1-3 to transmit the transverse load transmitted from the bottom end of the hanging short section 1-1 to the rotary sprayer shell 5 and inhibit the transverse deformation of the hanging short section 1-1 in the hollow piston rod 2-1. The articulated joint 1-5 is composed of universal joints of two pin shafts which are 90 degrees with each other, and can realize 360-degree free rotation on the horizontal plane. The upper end of the hinged joint 1-5 is connected with the lower end of the hanging short section 1-1, and the lower end of the hinged joint 1-5 is connected with the marine riser 6. When the riser 6 is inclined under the action of sea currents or waves, bending moment can be released at the hinged joints 1-5 (the riser 6 can rotate around the bending moment, and bending moment load borne by the riser 6 is released), so that safety of the suspension system is ensured.

As shown in fig. 1 and 2, a hollow piston rod 2-1 and a hydraulic cylinder 2-2 of the hydraulic damping system are of a hollow structure, the hydraulic cylinder 2-2 is composed of an inner hollow tube and an outer hollow tube which are coaxially arranged, the hollow piston rod 2-1 is arranged in an annular cavity formed by the inner hollow tube and the outer hollow tube, two ends of the annular cavity are closed ends, a hanging short section 1-1 is arranged in the inner cavity of the hollow piston rod 2-1, and the hanging short section 1-1 can penetrate through the inner cavity of the hollow piston rod 2-1 and then is assembled at the top end of the hollow piston rod 2-1 through a top hanging mechanism 1-2. The outer side wall of the hydraulic cylinder 2-2 is provided with a boss which is located on a chuck 3 of a drill floor 4, supports a whole set of soft suspension device and bears high axial load of the soft suspension device and a riser string connected with the soft suspension device. The hydraulic control system 2-3 (see the patent application document with the application number of 201911249377.X and the name of the invention of the hydraulic system for reducing the axial dynamic load of the floating drilling platform suspension riser) is connected with the hydraulic cylinder 2-2 and used for controlling the flow and the pressure of the rod cavity or the rodless cavity. When the marine riser 6 is hung, the hydraulic damping system can monitor acceleration and control the pressure of the hydraulic cylinder 2-2 in a rodless cavity or a rod cavity through the controller, so that the dynamic load of the marine riser 6 generated by heave motion is reduced, the damping purpose is achieved, the adaptability of the marine riser 6 under the typhoon working condition is improved, and the safety of the marine riser 6 is guaranteed. The hydraulic control system 2-3 can control the pressure of the hydraulic cylinder 2-2 so as to reduce the dynamic load of the marine riser 6 caused by heave movement, achieve the aim of shock absorption, improve the adaptability of the suspended marine riser 6 under the typhoon working condition and ensure the safety of the suspended marine riser 6.

In the above embodiment, as shown in fig. 4, the centering mechanism 3 includes two symmetrically arranged semi-cylindrical structures, the two semi-cylindrical structures are sleeved in a clamping groove of a tapered tube at the bottom of the suspended short section 1-1 and are fastened and connected by a screw, and the centering mechanism 3 is used for centering the suspended short section 1-1, so that the suspended short section 1-1 can reciprocate up and down in the hollow piston rod 2-1 of the hollow hydraulic cylinder 2-2 without transmitting bending load to the hydraulic cylinder 2-2.

In the above embodiment, as shown in fig. 3, the top suspension mechanism 1-2 is composed of two semicircular snap rings, the joints of the two semicircular snap rings are fastened together by screws, and the top suspension mechanism 1-2 is fastened at the top end of the hollow piston rod 2-1 by screws.

The soft suspension device for the drilling riser comprises the following steps when the riser 6 is suspended:

(1) disconnecting the marine riser 6 in a connection state from the subsea equipment, lifting the marine riser 6 at the upper end to a preset suspension length by using a large hook of the drilling platform, and seating the top end of the marine riser 6 on the chuck 3 of the drill floor 4;

(2) hoisting the off-line assembled soft suspension device to the position of a drill floor, connecting the hinged joint 5 with the top end of the marine riser 6, and lowering the soft suspension device and the marine riser 6 connected with the same until the boss at the outer side of the hydraulic cylinder 2-2 is located on the chuck 3 to complete suspension of the marine riser 6.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.