CN106968610B - A single self-monitoring marine drilling riser - Google Patents

Abstract

The invention relates to a single self-monitoring marine drilling riser, which is characterized in that: it includes an inner pipe, an outer pipe, an upper flange, a monitoring system, and a signal transmission system; the invention is a double-layer structure, and the sensor is arranged in the middle It is convenient for the disassembly and assembly of the inner and outer pipes and the replacement of the strain gauge; the fixed connection method between the inner and outer pipes and the flange adopts the clip type and the plug-in type, and the contact part is sealed with a gasket, which realizes the rapid disassembly and assembly and positioning; the outer pipe has a control room , the maintenance and replacement of the signal processing module is convenient, and the entire riser does not need to be disassembled; the monitoring system mainly includes sensors and signal processing modules; the signal transmission system mainly includes coaxial cables and wires; the invention has simple structure, high reliability, and automation. High level, real-time monitoring of the riser can be realized, and potential problems existing in the riser can be discovered in time.

Description

A single self-monitoring marine drilling riser

technical field

The invention relates to a single riser, in particular to a single riser capable of self-monitoring used in the field of offshore oil and gas drilling.

Background technique

The offshore drilling riser is an important component connecting the subsea wellhead and the drilling platform. In the complex marine natural environment, the wave-induced vibration and vortex-induced vibration of the offshore drilling riser may easily lead to failure accidents such as damage and fatigue fracture of the riser system. . In order to deeply reveal the dynamic characteristics of the offshore drilling riser system and prevent the occurrence of riser failure accidents, it is necessary to conduct real-time monitoring of the riser system vibration. At present, the monitoring device is mainly installed outside the riser, and the monitoring information is transmitted to the drilling platform through sound waves. This solution requires the installation and disassembly of the monitoring device during the drilling operation of each oil and gas well, which seriously affects the operation efficiency. Sound waves are used for monitoring signal transmission, and the accuracy of signal transmission needs to be improved. To this end, a single drilling riser that can be monitored by itself is designed. The drilling riser has a built-in monitoring sensor, and the monitoring signal is transmitted to the drilling platform through the coaxial cable and the inductive coil, which can realize the self-monitoring and signal transmission of the drilling riser. and other functions to solve the problem of real-time monitoring of the vibration of the riser system.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a single riser that has a simple structure, is easy to operate and can effectively solve the problem of vibration monitoring.

The present invention is realized through the following technical solutions: a single marine drilling riser that can be monitored by itself is characterized in that: it comprises an inner pipe, an outer pipe, an upper flange, a monitoring system, and a signal transmission system; the inner pipe The upper end is provided with a plurality of mounting bumps along the circumferential direction, the lower end of the inner pipe is provided with a flange, the lower end flange of the inner pipe is provided with a number of bolt holes along the circumferential direction, and the end face of the flange is provided with an L-shaped positioning groove and an L-shaped positioning groove; An annular deep groove is set on the upper end surface of the lower end flange of the inner tube; a positioning bump is arranged at the lower part of the outer tube, and the positioning bump is matched with the L-shaped positioning groove and the L-shaped positioning groove on the lower end flange of the inner tube. The clip-type installation is realized; a control room is arranged on the side of the outer tube, a wiring port is arranged at the rear of the control room, and a sealed end cover is arranged in the control room, and the end cover is provided with several bolt holes along the circumferential direction; the The upper flange is provided with a number of bolt holes along the circumferential direction; the upper flange is provided with an upper annular deep groove, the upper flange is provided with a number of L-shaped installation grooves and L-shaped installation grooves along the circumferential direction, and the upper end of the inner tube is installed with the projection block and the inner tube. The L-shaped installation groove of the upper flange is matched with the L-shaped installation groove to realize clip-type installation; the upper flange is provided with an annular groove corresponding to the installation position of the outer pipe, and the annular groove is matched with the top of the outer pipe to realize the plug-in installation. ; the monitoring system includes a sensor and a signal processing module; the signal processing module of the monitoring system is arranged inside the control room; the signal transmission system includes an inductance coil, a butt joint, a coaxial cable and a cable joint, the inductance The coils are arranged in the upper annular deep groove and the lower annular deep groove, and the inductance coils are provided with butt joints; cable joints are arranged at both ends of the coaxial cable, and the coaxial cable joints are respectively connected with the upper annular deep groove. The deep groove is connected with the butt joint of the inductor coil in the lower annular deep groove.

It is characterized in that the sensor of the monitoring system adopts a strain gauge.

It is characterized in that the flange at the lower end of the inner pipe is integral with the inner pipe.

It is characterized in that the side control chamber of the outer tube and the outer end cover are connected by bolts and sealed by a sealing ring.

It is characterized in that the inductance coil installed in the upper annular deep groove of the upper flange and the lower annular deep groove of the lower end flange of the inner tube is sealed and insulated with insulating filling material.

The present invention has the following advantages due to the adoption of the above technical solutions: 1. The present invention integrates the riser structure, the monitoring system and the signal transmission system, and forms a single riser that can be monitored by itself after assembly, which can be directly used in offshore drilling operation, and monitor the vibration information of the riser in real time. 2. Signals are transmitted between single risers through non-contact inductive coils, which can avoid damage to the signal transmission system during the docking and disassembly of single risers. 3. The single riser is designed as an inner and outer two-layer structure. The monitoring system and the signal transmission system are located in the sealed space of the inner and outer pipes, providing a good working environment for the monitoring system and the information transmission system. 4. The inner and outer pipes and flanges of the present invention are positioned and installed by two methods of clipping and inserting, which can realize the rapid installation and disassembly of a single riser. 5. In the present invention, a control room is arranged on the outer pipe, which is convenient for the maintenance and replacement of the signal processing module, and the replacement operation can be completed without disassembling and assembling the entire water riser.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a riser structure of the present invention.

FIG. 2 is a schematic diagram of the upper flange of the present invention.

Fig. 3 is a schematic diagram of the flange at the lower end of the inner pipe of the present invention.

FIG. 4 is a schematic diagram of the control outdoor end cover of the present invention.

FIG. 5 is a schematic diagram of the sensor arrangement of the present invention.

In the figure, 1. Upper flange, 2. Inner tube, 3. Sensor, 4. Outer tube, 5. Positioning bump, 6. Lower flange of inner tube, 7. Cable joint, 8. Coaxial cable, 9. Cable port, 10. Signal processing module, 11. Outer end cap, 12. Mounting bump, 13. Butt joint, 14. Inductor coil, 15. Annular groove, 16. Upper annular deep groove, 17. L-shaped installation Slot, 18. Upper flange bolt hole, 19. L-shaped positioning groove, 20. Lower annular deep groove, 21. Lower flange bolt hole, 22. Outer end cover bolt hole.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the present invention mainly includes an upper flange 1, an inner tube 2, a sensor 3, an outer tube 4, a positioning bump 5, a lower flange 6 of the inner tube, a cable joint 7, a coaxial cable 8, and a wiring port 9. Signal processing module 10 , outer end cover 11 , mounting bump 12 , butt joint 13 , inductor coil 14 .

As shown in Figure 1, Figure 2, Figure 3, Figure 4, the inner tube 2 and the lower flange 6 of the inner tube of the present invention are set as one piece, in the form of welding, and the lower flange of the inner tube is provided with several lower flanges along the circumferential direction. Bolt holes 21, the lower flange 6 of the inner tube is provided with a number of L-shaped positioning grooves 19 along the circumferential direction, the upper end of the inner tube 2 is provided with a number of mounting bumps 12, and the upper flange 1 is provided with a number of L-shaped mounting grooves 17 along the circumferential direction, The number of grooves corresponds to the mounting projections 12 of the inner tube 2 . The upper flange 1 is provided with a number of upper flange bolt holes 18 along the circumferential direction, the L-shaped installation groove 17 of the upper flange 1 is horizontally opened to the lower end face of the upper flange 1, and the annular groove 15 of the upper flange 1 is as deep as the inner pipe. The height difference between 2 and the outer pipe 4 is the same, the upper flange 1 and the outer pipe 4 are installed by plug-in, and the horizontal grooves of the L-shaped installation groove 21 and the L-shaped positioning groove 19 are respectively connected with the installation bump 12 and the positioning bump 5. Gaskets are used to seal between them. There are several positioning protrusions 5 at the lower end of the outer tube 4, and the positioning bumps 5 of the outer tube 4 correspond to the number of slots. In the signal processing module 10, the control room is provided with a sealed outer end cover 11 to facilitate the replacement of the signal processing module 10. The outer end cover 11 is provided with a number of outer end cover bolt holes 22 in the circumferential direction, and the outer end cover 11 and the control room are connected by bolts , add a sealing ring in the middle for sealing. The sensor 3 is attached to the outer wall of the inner tube 2, and the sensor 3, the coaxial cable 8, and the signal processing module 10 are connected. The two ends of the coaxial cable 8 are provided with a cable joint 7, and the cable joint 7 is connected with the butt joint 13, and the butt joint 13 transmits data to its adjacent induction coil 14, and the induction coil 14 in the upper and lower flanges of the connected riser generates an alternating magnetic field through the induction principle, so that the latter generates an induced current to realize data transmission.

As shown in FIG. 5 , the present invention arranges a group of strain gauges along the circumferential direction at intervals of 90° at the target position detected by the riser, and each group of strain gauges is respectively arranged one along the axial direction and one in the circumferential direction. The joints of the directional strain gauges are connected by wires to form a half-bridge circuit, which is then connected to the signal processing module 10 . The signal processed by the signal processing module 10 is transmitted through the coaxial cable 8, and finally the measured stress response data can be obtained.

The assembly sequence of the present invention is as follows: the sensor 3 is arranged at the target position of the outer wall of the inner tube 2 at intervals of 90° along the circumferential and axial directions, the coaxial cable 8 is installed, and the cable joint 7 at the lower end of the coaxial cable 8 is connected with the butt joint 13. For installation, one end of the wire is connected to the sensor 3 and the coaxial cable 8, and the other end of the wire that needs to be connected to the signal processing module 10 is placed at the position corresponding to the wiring port 9; the positioning bump 5 at the lower end of the outer tube 4 corresponds to the lower end of the inner tube The positioning L-shaped 19-slot vertical slot of flange 6 is installed downward. After reaching the bottom, it is rotated and installed. The positioning bump 5 and the horizontal slot of the L-shaped positioning slot 19 are sealed with a gasket. Indoor, connect the corresponding wires with the signal processing module 10 to form a complete passage; install the control room end cover 11, add a sealing ring between the control room and the end cover, and use bolts to connect; connect the cable joint on the upper end of the coaxial cable 8 7. Install it with the butt joint 13, then install the upper flange 1, lower the position corresponding to the installation bump 12 of the inner tube 2 and the vertical groove of the L-shaped installation groove 17, and then rotate and install it when it reaches the bottom, and install the bump 12 and the L-shaped installation. The transverse grooves of the installation groove 17 are sealed with sealing gaskets; as with the installation of ordinary risers, a single installed offshore drilling riser that can be monitored by itself can be installed through flange bolts.

Claims (4)

1. a single marine drilling riser capable of self-monitoring, is characterized in that: it comprises inner pipe, outer pipe, upper flange, monitoring system, signal transmission system; The upper end of the inner tube is provided with a number of mounting bumps along the circumferential direction, the lower end of the inner tube is provided with a flange, the lower end flange of the inner tube is provided with a number of bolt holes along the circumferential direction, and the upper end surface of the inner tube lower end flange is provided with a positioning L-shaped groove; an annular deep groove is provided on the upper end face of the lower end flange of the inner pipe; The lower part of the outer tube is provided with a positioning bump, which cooperates with the positioning L-shaped groove on the lower end flange of the inner tube to realize clip-type installation; a control room is arranged on the side of the outer tube, and the control room The rear is provided with a wiring port, the control room is provided with a sealed outer end cover, and the outer end cover is provided with several bolt holes along the circumferential direction; The upper flange is provided with a number of bolt holes along the circumferential direction; the upper flange is provided with an upper annular deep groove, the upper flange is provided with a number of installation L-shaped grooves along the circumferential direction, and the upper end of the inner tube is installed with the protrusion and the The upper flange is installed with the L-shaped groove to achieve clip-type installation; the upper flange is provided with an annular groove corresponding to the installation position of the outer pipe, and the annular groove cooperates with the top of the outer pipe to realize plug-in installation; The monitoring system includes a sensor and a signal processing module; the signal processing module of the monitoring system is arranged inside the control room; The signal transmission system includes an inductive coil, a butt joint, a coaxial cable and a cable joint, the inductance coil is arranged in the upper annular deep groove and the lower annular deep groove, and the inductive coil is provided with a butt joint; the Both ends of the coaxial cable are provided with cable joints, and the coaxial cable joints are respectively connected with the butt joints of the inductance coils in the upper annular deep groove and the lower annular deep groove; The inductance coil installed in the upper annular deep groove of the upper flange and the lower annular deep groove of the lower end flange of the inner tube is sealed and insulated with insulating filling material. 2 . The single self-monitoring offshore drilling riser according to claim 1 , wherein the sensor of the monitoring system adopts a strain gauge. 3 . 3 . The single self-monitoring offshore drilling riser according to claim 1 , wherein the flange at the lower end of the inner pipe is integral with the inner pipe. 4 . 4 . The single self-monitoring offshore drilling riser according to claim 1 , wherein the control room on the side of the outer pipe and the outer end cover are connected by bolts and sealed with a sealing ring. 5 .