KR101707151B1 - Integrated Monitoring Apparatus and Method for Jack-up Rig - Google Patents

Abstract

The present invention relates to a method of measuring a reaction force and a vertical displacement applied to a leg driving apparatus during installation or recovery of a jack up league or a jack up league, monitoring a variation amount of a pore pressure sensor of the sped can, The present invention relates to an integrated monitoring apparatus and method for a jack-up league capable of controlling stability of a jack-up league structure and improving operational efficiency by organically controlling the apparatus. A sprue can installed at the lower end of the leg to support the leg against the seabed ground; a water spray unit installed in the sprue can for spraying water to the outside; A monitoring apparatus of a jack-up league including a driving unit, And the reaction force sensor measuring a reaction force applied to the driving unit through; A displacement sensor for measuring a displacement of the leg in the vertical direction with respect to the hull; A pore water pressure sensor installed in the spud can and measuring a pore water pressure of a seabed ground; And a controller for controlling the operation of the water injection unit and the driving unit on the basis of the reaction force, the displacement and the pore pressure measurement value transmitted from the reaction force sensor, the displacement sensor and the pore pressure sensor, respectively.

Description

TECHNICAL FIELD [0001] The present invention relates to an integrated monitoring apparatus and method for a jack-

The present invention relates to a jack-up rig, and more particularly, to a jack-up rig that is installed at the bottom of a leg of an offshore plant such as a jack-up ring used for oil drilling or power generation, Up league monitoring apparatus and method capable of monitoring the stability of the jack-up league while operating the jack-up league and controlling the operation of the driving unit and the water jetting apparatus while spraying water through a spudcan supporting the jack- .

Generally, rigs are used not only for deep-sea oil fields but also marginal fields which have been neglected due to economic difficulties by having drilling facilities suitable for oil field development due to development of submarine mining technology.

This type of league consists of a jack-up rig, which is installed on the hull with three to six legs installed on the sea floor to mount the hull on the sea, Semi-submerged, linear-shaped like a hull, and an embankment artificial island made of an artificial island by embedding the earths, gravity-type and disk-like floating structure which absorbs the wave or seismic force by submerging the submarine And a disk-shaped body.

Among the above-mentioned leagues, the jack-up league can be installed not only in rocky areas but also in soft grounds. Usually, three independent legs are applied, and in some cases, more than four legs are applied. A spudcan is provided at the lower end of the leg to stably support the jack-up rig.

On the other hand, when the surface layer is a sand layer, there is a problem that the spud can is not installed deeply in the seabed ground when a jack-up league is installed. When the surface layer is a clay layer, There is a problem that the spandan can not be pulled out well.

To solve this problem, a technique for mounting a water injection device in a sprung can was developed. The application method of the water spray using the water injection device is different according to the ground type. If the surface layer is a sand layer, it should be buried in the bottom of the seabed until the height of the spade can be up to the height of the jack cane for the stability of the structure. For this purpose, the pore pressure and seepage force of the sand layer should be changed through water injection to weaken the shear resistance of the sand layer. In this case, if water injection time is long, punch-through phenomenon occurs in the sand layer, and the resistance of the ground rapidly decreases, which can cause a jack-up league conduction accident. Therefore, a technique to control the amount of water injection and the time using a sensor is required to measure changes in soil properties (pore water pressure), reaction force, and vertical displacement. At present, water injection is not performed in the sand layer due to the risk of punch through.

When the surface layer is a clay layer, when the jack-up league is installed, the spandan cans naturally penetrate deeply into about 20m, but when the jack-up league is recovered, the spandan can is not extracted well due to the characteristics of the clay layer. Therefore, when the spudded can is pulled out, water spraying is performed to weaken the shear resistance of the clay layer so that the spudded can is pulled out well. However, if the water injection can not be controlled properly at this time, the ground may collapse.

In addition, the jack-up league is normally installed and operated in one place for six months to two years. At this time, there is a risk of overturning due to changes in the physical properties of the ground due to the surrounding conditions such as scouring and earthquakes.

Open Patent No. 10-2015-0045013 (published on April 28, 2015) Registration No. 10-1422237 (Registered on July 16, 2014)

The present invention relates to a method of measuring a reaction force and a vertical displacement applied to a leg driving apparatus during installation or recovery of a jack up league or a jack up league, monitoring a variation amount of a pore pressure sensor of the sped can, The present invention provides an integrated monitoring apparatus and method of a jack-up league that can organically control the apparatus to secure the stability of the jack-up league structure and improve the operational efficiency.

According to another aspect of the present invention, there is provided an integrated monitoring apparatus for a jack-up league comprising a leg which is installed on a hull so as to be able to move up and down, a spud can installed at a lower end of the leg to support a leg against a seabed ground, A monitoring system for a jack-up league, comprising: a water injection unit installed in a sprue can for spraying water to the outside; and a driving unit for moving the legs up and down with respect to the hull, A reaction force sensor for measuring a reaction force applied to the driving unit; A displacement sensor for measuring a displacement of the leg in the vertical direction with respect to the hull; A pore water pressure sensor installed in the spud can and measuring a pore water pressure of a seabed ground; And a controller for controlling the operation of the water injection unit and the driving unit on the basis of the reaction force, the displacement and the pore pressure measurement value transmitted from the reaction force sensor, the displacement sensor and the pore pressure sensor, respectively.

The integrated monitoring method of the jack-up league using the integrated monitoring apparatus of the present invention includes the following steps.

(a) transmitting measurement data on the reaction force, the displacement, and the pore water pressure applied to the driving unit by the reaction force sensor, the displacement sensor and the pore pressure sensor to the controller

(b) calculating a variation amount of the reaction force with respect to time and a displacement variation with time and a variation amount of the pore water pressure according to time from the data transmitted from the reaction force sensor, the displacement sensor and the pore pressure sensor, respectively

(c) controlling the operation of the water injection unit or the driving unit based on the amount of change and displacement of the reaction force and the variation amount of the pore water pressure according to the calculated time

According to the present invention, reaction force information applied to a driver through a sprung can and a leg, displacement information of a sprung can and a leg, and pore water pressure information around the spud can can be monitored using a reaction force sensor, a displacement sensor and a pore pressure sensor, The operation of the driving unit and the water injection unit is controlled in accordance with the reaction force information, the displacement information, and the pore water pressure information so that the spud cans can be installed in the seabed so that the stability of the jack-up rig can be secured, .

FIG. 1 is a view schematically showing a configuration of a jack-up rig to which an integrated monitoring apparatus according to an embodiment of the present invention is applied.
2 is a view illustrating an embodiment of a driving unit of a jack up league according to the present invention.
3 is a view showing an embodiment of a sprue can and a water injection unit of a jack up league according to the present invention.
FIG. 4 is a block diagram illustrating a configuration of an integrated monitoring apparatus of jack-up leagues according to an embodiment of the present invention.

Hereinafter, an integrated monitoring apparatus and method of a jack-up league according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 schematically illustrate the structure of a jack up league according to the present invention. The jack up league 1 includes a plurality of (normally three to four) legs 20 a spudcan 30 installed at the lower end of each of the legs 20 to support the legs 20 against the bottom of the seabed, A drive unit for moving the legs 20 up and down with respect to the hull 10, a reaction force of the driving unit measured in real time, a displacement of the legs 20, and pore water pressure information of the seabed ground, And a monitoring device for controlling the operation of a water injection unit and a motor (not shown) of the driving unit.

The driving unit includes a plurality of pinion gears 41 rotated by a motor (not shown) installed on the hull 10 and a plurality of pinion gears 41 extending vertically on the side portions of the legs 20, And a rack gear 42 that meshes with the pinion gear 41. Therefore, when the motor (not shown) is energized to operate the motor, the pinion gear 41 is rotated by receiving the power of the motor, and the rack gear 42 engaged with the pinion gear 41 is rotated in the vertical direction So that the legs 20 are moved up and down with respect to the hull 10.

The leg 20, the spud can 30 and the water injection unit can be constructed by applying the same or similar structures to the leg 20, the spud can 30, and the water injection unit, which are provided in a known jack up league .

For example, the legs 20 may have a truss structure formed by connecting a vertical member and a slant member, and a reinforcing member may be additionally provided to secure structural stability.

The spudcan (30) is embedded in the seabed ground at a predetermined depth to support the legs (20) on the seabed ground. A water spraying unit is installed at upper and lower portions of the spud can 30 to fill the spud can 30 with the seabed and to draw water from the ground and collect water to facilitate burial operation or recovery operation .

The water injection unit includes a water supply line 51 connected to a water source configured in the hull 10 through the leg 20 and extending into the interior of the spud can 30, And a nozzle 53 connected to each end of the branch line 52 and communicating with the outside through upper and lower surfaces of the sprung can 30 to spray water, .

2 to 4, the monitoring device includes a reaction force sensor 61 installed on the driving unit and measuring a reaction force applied to the driving unit, A pore water pressure sensor 63 installed in the spud can 30 for measuring the pore water pressure of the seabed ground and a reaction force sensor 61 and a displacement sensor 62, And a controller 64 for controlling the operation of the water injection unit and the driving unit on the basis of the reaction force, the displacement, and the pore pressure measurement value transmitted from the pore water pressure sensor 63, respectively.

The reaction force sensor 61 is installed on the pinion gear 41 of the driving unit so that the reaction force applied to the leg 20 and the sprung can 30 can be detected in real time And transmits it to the controller 64. As the reaction force sensor 61, a load cell or the like may be applied.

The displacement sensor 62 measures the displacement of the leg 20 in the vertical direction by the driving unit in real time and transmits it to the controller 64. The displacement sensor 62 is preferably mounted on a component (in this embodiment, a rack gear) that performs a linear motion of the driving unit. However, the displacement sensor 62 is not limited thereto, and may be a position capable of accurately measuring the displacement of the leg 20 in the up- It does not matter where it is.

The pore water pressure sensor 63 is installed near the nozzles 53 of the water injection unit in the upper and lower portions of the spud can 30 to measure the pore water pressure around the pore water pressure sensor 63 in real time, 64).

The controller 64 may be configured as a deck of the hull 10 and is electrically connected to the reaction force sensor 61, the displacement sensor 62 and the pore pressure sensor 63, (Not shown) of the driving unit and the operation of the water injection unit according to the measured data.

An integrated monitoring method using the integrated monitoring apparatus of the present invention configured as described above will now be described.

When the reaction force data, the displacement data and the pore pressure data measured by the reaction force sensor 61, the displacement sensor 62 and the pore pressure sensor 63 are transmitted to the controller 64, the controller 64 compares the reaction force data and displacement (DELTA F / DELTA T) and a displacement (DELTA D / DELTA T) with respect to time and a pore water pressure variation DELTA P / DELTA T with respect to time are calculated from the data and the pore water pressure data.

Then, the controller 64 monitors the state of the jack-up league during the lifting operation or the jack-up league operation of the leg 20 of the jack-up league on the basis of the variation amount of the reaction force and the displacement amount and the pore water pressure variation amount according to the calculated time , The operation of the water injection unit or the driving unit.

For example, in the case where the surface layer of the seabed ground is a sand layer, when the leg 20 of the jack-up league is installed in the bottom of the sea bed, the pinion gears of the driving portion, The amount of change in the reaction force applied to the spindle can 41 or the motor (not shown), the vertical displacement of the leg 20, and the amount of change in pore water pressure around the spud can 30 The operation of the driving unit and the water injection unit is controlled in accordance with the variation amount of the calculated reaction force and the displacement and the variation of the pore water pressure by organically controlling the operation of the water injection unit So that the legs 20 can be stably installed in the sand layer within a short period of time.

When the surface layer of the ground is a clay layer, when the leg 20 is lifted to recover the jack-up league, the pinion gear 41 or the motor (not shown) of the drive unit is driven via the sprung can 30 and the leg 20 The amount of change in the applied reaction force, the vertical displacement of the leg 20, and the amount of change in pore water pressure around the sprue can 30 (in this case, the measurement data by the pore pressure sensor provided on the spud can is mainly used) 20 and the spud can 30 are monitored and the operation of the driving unit and the water injection unit is controlled in accordance with the variation amount of the calculated reaction force and the displacement and the variation of the pore water pressure, So that it can be stably escaped.

The reaction force information applied to the actuator through the sprung can 30 and the leg 20 and the reaction force information applied to the sprue can 30 using the reaction force sensor 61, the displacement sensor 62 and the pore water pressure sensor 63, And the displacement information of the legs 20 and the pore water pressure information around the spade can 30 and controls the operation of the driving unit and the water injection unit according to the reaction force information, The spur can cans 30 can be quickly installed in the seabed ground or can be taken out from the seabed and recovered while ensuring stability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

1: Jack up league 10: Hull
20: leg 30: sprang
41: pinion gear 42: rack gear
51: water supply line 52: branch line
53: nozzle 61: reaction force sensor
62: Displacement sensor 63: Pore pressure sensor
64: controller

Claims (4)

A sprue can installed at a lower end of the leg to support the legs against the seabed ground; a water spray unit installed in the sprue can for spraying water to the outside; And a driving unit for moving the upper and lower jacks of the jack up league,
A reaction force sensor installed in the driving unit and measuring a reaction force applied to the driving unit through the sprung can and the leg;
A displacement sensor installed on a component for performing linear motion of the driving unit and measuring a displacement of the leg with respect to the hull in a vertical direction;
A pore water pressure sensor disposed around the nozzle for spraying water on the upper surface and the lower surface of the spud can, and measuring a pore water pressure of the seabed ground;
And a controller for controlling operations of the water injection unit and the driving unit on the basis of the reaction force, the displacement, and the pore water pressure measured value transmitted from the reaction force sensor, the displacement sensor and the pore pressure sensor, respectively. . delete delete 11. An integrated monitoring method of a jack-up league using the integrated monitoring apparatus according to claim 1,
(a) transmitting measurement data on a reaction force, a displacement, and a pore water pressure of the reaction force sensor, the displacement sensor, and the pore pressure sensor to the controller;
(b) calculating a change amount of a reaction force with respect to time and a displacement amount according to time and a pore water pressure change amount according to time from the data transmitted from the reaction force sensor, the displacement sensor and the pore pressure sensor, respectively; And,
(c) controlling the operation of the water injection unit or the driving unit based on the amount of change and displacement of the reaction force and the variation of the pore water pressure according to the calculated time.

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