SU1448022A1 - Underwater drilling rig - Google Patents

Abstract

The invention relates to mining equipment. The goal is to increase the productivity of drilling in the open sea through the use of wave energy and hydrostatic pressure. Underwater drilling installation includes a self-driven drilling mechanism. The autosotun drive includes driving hydraulic heads (HZ) 4 and 17, float (П) 27. Pistons 5,18 HZ 4 and 17 are spring-loaded with recurrent gears 10 and 22. The piston and rod cavities of the HZ 4 and 17 are connected by lines to the hydraulic motor 38 and the generator 39 through check valves and tanks 12, item 9 (L 33. 4 4).

Description

15 high and low pressure. The container 12 has a through hole 31 with a valve 32, a diaphragm 33 and is connected to a container 15. A & a winch, cable 8 of which from the drum 29 bends around blocks 21.9. The block 21 is fixed on the rod 20 HZ 17, and the block 9 is fixed on the base 1 to HZ 4.

In the process of reciprocating P 27, the working fluid is pumped from the sludge container 15 to the high pressure tank. This provides an autonomous function of the rig drive for a long time. 2 Il.

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The invention relates to the mining industry, in particular to underwater drilling rigs.

 The purpose of the invention is to increase the productivity of drilling in the open sea through the use of wave energy and hydrostatic pressure.

Figure 1 shows an underwater drilling rig, a general view of fig.2 in an autonomous drive of an underwater drilling rig, a general view.

The underwater drilling rig with an autonomous drive includes a base 1 with supports 2, on which a drilling mechanism and a cartridge for drill pipes 3 are mounted, as well as an autonomous drive.

 The autonomous drive includes a drive hydraulic unit 4, which has a piston 5 with check valves 6 and a rod 7, to which a cable 8 is attached, passed through a bypass unit 9 attached to the base 1. A return spring 10 is installed in the rod cavity of the drive hydraulic cylinder 4, and The rod cavity itself is connected by a pressure line 11 with a capacity of 12 high pressure through a non-return valve. 13 The piston cavity of the driving hydraulic cylinder 4 is connected by a drain line 14 to an empty capacity of 15 through a non-return valve 16. The hydraulic cylinder 4 is fitted with an additional hydraulic cylinder 17, having a piston 18 with check valves 19 and a rod 20 on which a bypass unit 21 is fixed. In the piston cavity of the additional hydraulic cylinder 17 a spring 22 is installed, and the piston cavity itself is connected by a pressure line 23 with a high-capacity tank 12 pressure through reverse

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valve 24, while the rod end of the hydraulic cylinder is connected to an unfilled container 15 by a drain line 25 via a non-return valve 26. On the base 1, the float 27 is fastened with the help of disconnecting elements 28, to which is attached a drum 29 with a wound cable 8, passed through the bypass unit 21 the stem 20 of the additional hydraulic cylinder 17 and the throat 30 in the base 1. The high pressure container 12 has a through hole 31, where the valve 32 is installed, a membrane 33 and is filled with technical oil, and is also connected to an unfilled container 15; a liquid level sensor 32 and a pressure line 35, where the safety valve 36 is installed, the starting valve 37 and the drive hydraulic motor 38J connected to the generator 39.

Underwater drilling installation with autonomous drive works as follows.

On the vessel, the float 27, having positive buoyancy, with the cable 8 wound on the drum 29, is fixed on the base 1 by means of disconnecting elements 28 (for example, squibs) above the neck 30 (the length of the cable wound on the drum must be equal to the sea depth at the installation site ). Then the cable 8 is stored in the bypass blocks 9 and 21 and fixed to the rod 7 of the driving cylinder, and the hydraulic system is filled with technical oil with the starting spool 37 closed. The prepared for installation installation is taken overboard using a ship's lifting device and lowered to the bottom.

When placed on the bottom, the winch carrier cable is automatically disconnected and the installation starts from a touch sensor signal (not shown). The signal from the touch sensor enters the starting spool 37, causing the starting spool to open and the working fluid from the high pressure tank 12 begins to flow into the unfilled tank 15 through line 35 under a pressure equal to the hydrostatic ambient pressure, driving the hydraulic motor 38 and the generator 39 from which the driving motors of the drilling mechanism assemblies are powered. As the volume of the working fluid in the high pressure tank 12 decreases, it is filled with seawater through the opening 31 and the valve 32. The operating time of the installation due to the hydrostatic pressure is determined by the volume of the working fluid in the high pressure tank 12 and its flow, which determines the power of the hydraulic motor 38 After the empty tank 15 is filled with the working fluid to a critical level, a level sensor 34 is triggered which sends a signal to the disconnecting elements 28, the operation of which leads to the release The float 27 is driven. When the float 27 floats up, the working cable 8 is wound from the drum 29 until the float reaches the sea surface. Under the action of the waves, the float 27 begins to reciprocate with an amplitude equal to the height of the waves. When the float 27 moves upwards, the working cable 8 acts on the rod 20 of the additional hydraulic cylinder 17 through the bypass unit 21, causing it to move upwards and force the working fluid through the piston 18 into the high pressure tank 12 through the pressure line 23 and the check valve. At the same time, the working fluid is sucked from the tank 15 through the drain line 25 and the check valve 26 as a result of which the return spring 22 is compressed. If the wave height does not exceed the magnitude of the stroke of the rod 20, then its reverse movement is carried out under the action of the return spring 22 (when the float 27 moves down). This opens the check valves 19 piston1448022

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18 and the check valves 24 and 26 of the lines 23 and 25 are closed, and the working fluid flows from the rod cavity of the hydraulic cylinder to the piston one. When the wave height exceeds the stroke of the rod 20 of the auxiliary hydrocylinder 17, the main hydrocylinder 4 is turned on, the rod 7 of which is pulled out of the hydro1 1 or 1hezdra using the cable 8, compressing the return spring 10 (the float 27 continues to move to the wave crest), as a result, the working fluid is further injected into the high-pressure tank 12 through the pressure line 11 and the check valve 13, and the working fluid is simultaneously sucked from the main tank 15 through the drain line 14 and the check valve 16. The return The first stroke of the rod 7 occurs when the float 27 moves down under the action of the return spring 10. This opens backward.

5, the valves 6 in the piston 5 and the check valves 13 and 16 are closed in the line x 11 and 14, and the working fluid flows from the piston cavity to the rod. The sequence of operation of the auxiliary and main hydraulic cylinders is ensured by the use of return springs of various rigidity. The stiffness of the return spring 22 is chosen such that its compressive force at the end of the stroke of the rod 20 is equal to the compressive force of the return spring 10 at the initial moment of movement of the rod 7. At the same time, the buoyancy of the float is chosen not less than 0 compressive force of the return spring 10.

Thus, in the process of reciprocating movement of the float 27, the working fluid is pumped out of the drain tank

5 15 in the high pressure tank 12, which provides autonomous operation of the drilling rig drive for a long time. Productivity offered

Claims (1)

the underwater drilling rig in open sea conditions is more productive than the known installations due to the sharing of hydrostatic pressure energy and wave energy. Invention Formula . Underwater drilling installation, including the drilling mechanism with autonomous 0 five five a drive mounted on the basis of a drive hydraulic cylinder, the piston of which is spring-loaded by a return spring installed in the rod cavity and has a check valve, and the piston and rod cavities are connected by means of high-pressure and low-pressure tanks -IQ on the base by means of the lock. The winch connected with the cable to the drive cylinder of the hydraulic cylinder is attributable to the fact that, in order to increase efficiency and ensure the autonomy of drilling in the open sea through the use of wave energy and hydrostatic pressure, it is equipped with a float buoyancy, bypass blocks and mounted on the base. Opposite to main drive .27 a hydraulic cylinder, an additional driven hydraulic cylinder with a return spring in the piston cavity, while the piston and rod cavities of the main and additional driving hydraulic cylinders are connected to the main lines by means of check valves, and on the float, which is fixed a winch is installed, the cable of which bends around the bypass blocks, one of which is fixed on the rod of the additional driving hydraulic cylinder, and the other on the base above the main drive hydraulic cylinder, while the high pressure tank is made with a flexible membrane installed in its cavity and has on the outside flexible membrane through hole with valve installed in it. V j