JPS6131590A - Sea bottom trial digging apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to an underwater exploration drilling device.

[Conventional technology]

In a suspension-type or bottom-mounted test drilling rig that is lowered from a mother ship at sea, a reaction force against the rotational moment of the test tube acts, so the entire test drilling rig is swung nine times and moves. Therefore, the test drilling equipment takes some kind of countermeasure against the reaction force, such as increasing the negative buoyancy or, as shown in the perspective view of FIG. It is known that the reaction force of the core tube 01 is offset by the rotation of the impeller 020.

[Problem that the invention seeks to solve]

However, in such a device, if the negative buoyancy is increased, the lifting device of the test drilling device will become large, and if the impeller 02 is provided, the power for rotating the impeller 02 will be completely wasted.

The present invention attempts to solve this longevity problem.

[One Means for Solving the Problems] To this end, the present invention provides a bottom test drilling equipment in which a test drilling tube is installed on a frame that is suspended from the sea and landed on the seabed, in which a pair of test tubes are installed in opposite directions. The invention is characterized by comprising one or more sets of test drilling tubes, and a control device that detects the load of each test drilling tube in each set and controls an electric motor for driving each test drilling tube in each set. shall be.

[Effect]

With the above-described configuration, it is possible to obtain an undersea drilling device that does not move by being swung around.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the entire structure thereof, and FIG. 2 is a side view showing the internal structure of the test drilling apparatus of FIG. 1.

In the above figure, numeral 3 is an umbilical cable for lowering the drilling equipment 4 from the mother ship 1 to the seabed A by the crane 2;
9 is a plurality of wires that are suspended from the water pressure-resistant electric wire junction box 6 at the end of the anvil cable 3 and support part of the weight of the frame 8; 9 is drawn out from the electric wire junction box 6 and carries the controller 10; A water pressure resistant cable 12 is guided to equipment such as the underwater motor 11 via the submersible motor 11, and 12 is a driving device for rotating and propelling the trial excavation tube 13f by the rotational force of the submersible motor 11.

In such a structure, part of the weight of the frame 8 is supported by the wire 7, and the rest is supported by the seabed A, so that the frame 8 is equipped with two test-excavation tubes that keep the frame 8 in a vertical position.

In addition to the above, a submersible electric motor 11', a drive device 12' and a test tube 13' are provided, and under normal conditions, the test tubes 13 and 13' rotate in opposite directions.

10 is a control device that detects the load on the underwater electric motors 11 and 11' and controls the rotation or propulsion speed of the test drilling tubes 13 and 13' so that the reaction forces during test drilling are balanced with each other. It may be provided on the mother ship 1.

In such a device, the test drilling device 4 is suspended from the mother ship 1 and has landed on the seabed A. Under the control of the mother ship 1, rotation and propulsion are applied to the test drilling tubes 13 and 13' to perform test drilling.

At this time, the rotation directions of the trial drilling tubes 13 and 13' are opposite to each other.

The reaction force during the trial excavation is canceled out and the frame 8 is kept stable.

In addition, since the positions of the two trial drilling tubes 13 and 13' are different, if an unbalance of torque occurs between the two test tubes 13 and 13', which have different soil types on the seabed A, the controller 10 can detect this from, for example, the current value. A balanced state can be maintained by adjusting the rotation and propulsion of both.

According to such a device, the following effects can be achieved.

(1) There is no need to increase the negative buoyancy of the drilling equipment, so
The drilling equipment can be made lightweight and compact.

(2) Since we want to require impellers that rotate simultaneously in opposite directions, we can avoid wasting power. (3) Two samples can be collected at the same time.

〔Effect of the invention〕

In short, according to the present invention, in a submarine drilling device equipped with test drilling tubes on a frame suspended from the sea and brought to the bottom on the seabed, at least one pair of test drilling tubes with opposite rotating directions are provided, and The device is lightweight and compact because it is equipped with a control device that detects the load on each of the test tubes in each group and controls the electric motor for driving the test tube in each group.

The present invention is industrially extremely useful because it provides a seabed drilling device that consumes less power and can collect multiple samples at the same time.

[Brief explanation of drawings]

FIG. 1 is a side view showing the entire structure of an embodiment of the present invention, FIG. 2 is a side view showing the internal structure of the drilling equipment shown in FIG. 1, and FIG. 3 is a perspective view showing a known submarine testing equipment. . 1. Mother ship, 2. Crane, 3. Umbilical cable, 4. Test drilling equipment, 6. Wire connection box, 7. Wire, 8. Frame, 9. Water pressure cable, 10. Control. Equipment, 11.11'... Submersible electric motor, 12.12'...
Drive device, 13.13'... tube for test drilling, A... seabed,

Claims (1)

[Scope of Claims] A submarine drilling device equipped with test drilling tubes on a frame suspended from the sea and brought to the bottom on the seabed, comprising one or more pairs of test drilling tubes with rotation directions opposite to each other, and each of the above-mentioned 1. A submarine exploration drilling apparatus, comprising: a control device that detects the load on each of the trial drilling tubes in each set and controls an electric motor for driving each of the trial drilling tubes in each set.