KR20120105928A - Derrick load test method - Google Patents

Abstract

PURPOSE: A derik load testing method is provided to efficiently perform the verification of a winch unit, a dead line anchor, a traveling block, and a top drive etc. even structural intensity of a drill floor and an auxiliary structure. CONSTITUTION: A derik load testing method is as follows. A derik(310) is installed on a drill floor(220) of a marine structure. A drill line for testing a derik load is connected to the winch unit of one side of the drill floor from a deadline anchor(221) of the other side of the drill floor. A lifting structure of the derik is connected to between a main deck arranged in the lower part of the drill floor and a travelling block. A main measurement value measured by a load cell installed in the deadline anchor and an auxiliary measurement value measured by the load cell comprised in the lifting structure are compared. Whether or not the main measurement value or the auxiliary measurement value has a value within a preset range is verified.

Description

Derrick Load Test Method {DERRICK LOAD TEST METHOD}

Embodiments of the present invention relate to a derrick load test method.

As the industry develops, the consumption of global resources such as petroleum is gradually increasing, and thus, stable production and supply of crude oil has emerged as an important problem. Accordingly, offshore structures such as drilling vessels with drilling equipment suitable for the development of oil fields have been developed.

In the offshore drilling using such an offshore structure, a rig ship, a fixed platform, or the like dedicated to the offshore drilling, which performs the offshore drilling work in the state anchored at sea using a mooring device.

Recently, drill ships, semi-submersible rigs, tension leg platforms (TLPs), production storage ships, etc., equipped with drilling equipment and capable of sailing on their own power, have been developed. These production storage vessels include offshore oil-drilling platforms, floating production storage offloading (FPSO), crude oil drilling vessels, gas drilling vessels and floating liquefied gas storage vessels (LNG FSRU: LNG). Floating Production Storage Offloading).

1 is a diagram illustrating a conventional derrick test structure for a load test.

Referring to FIG. 1, a derrick test structure for testing a derrick rod is installed at a test site selected on a ground. These test sites can be installed derrick 100 only after the ground structure is reinforced to support the load of the structure.

Shackles of the first lug 120 are installed on one ground of the derrick 100, and sheaves of the second lugs 140 are installed on the other ground of the derrick 100. .

One end of the drill line 110 is connected to be fixed to the shackle of the first lug 120.

The intermediate portion of the drill line 110 extends from the shackle of the first lug 120, is connected with a traveling block 130 for the derrick in the form of a moving pulley, and continues to extend the second lug 140. Pass through the sheave).

Finally, the other end of the drill line 110 is connected to the crane (C) installed next to the derrick 100 on the ground.

One end of the sling wire 150 may be connected to the traveling block 130, and a lifting jig 160 may be connected to the other end of the sling wire 150.

The lifting jig 160 may be connected to a load flame 170 in which the load block 180 may be fixedly seated, and the load frame 170 may be interposed through a compression load cell 190. Can be fixedly connected to the ground in one state.

In addition, the derrick 100 may be further provided with a plurality of strain gauges for measuring the deformation amount in a plurality of predetermined positions. Strain gauge and compression load cell 190 may be connected to the derrick structure strength verification device.

After the derrick test structure as described above is installed, the drill line 110 is pulled to the crane (C) connected to the other end, and the deformation amount of the derrick 100 can be measured to verify the strength of the derrick structure. Although this test technique can verify the strength of the derrick structure itself, it is impossible to verify the overall structural deformation and strength of the drill floor of the offshore structure to which the actual load of the derrick and the substructure below it are impossible. .

In addition, since the test site must be selected in advance for reinforcement and dredging for the derrick road test, there is a problem that the test cost is high, and since the derrick road test is performed on the ground, It is difficult to verify operation under operating conditions for derrick-related equipment (eg winches, deadline anchors, top drives, etc.).

Embodiments of the present invention to provide a derrick load test method that can be carried out to perform a derrick load test by mounting the derrick on the offshore structure.

According to an aspect of the present invention, the step of installing the derrick on the drill floor of the offshore structure, and the derrick rod test drill line via a traveling block provided inside the derrick from the deadline anchor on one side of the drill floor Connecting the winch to the other side of the drill floor; connecting the lifting structure of the derrick between the main deck and the traveling block located below the drill floor; and winding the drill line with the winch to the derrick. Applying a rod, comparing a primary measurement measured by a load cell installed in the deadline anchor with an auxiliary measurement measured by a load cell provided in the lifting structure, and wherein the primary measurement or the auxiliary measurement is preset A derrick load that includes verifying whether it has a value within a range Test methods may be provided.

In addition, the lifting structure may be connected to a plurality of lugs installed on the main deck.

In addition, according to another aspect of the present invention, the step of installing the derrick on the drill floor of the offshore structure, and the drilling line for the derrick rod test from the deadline anchor on one side of the drill floor provided a traveling block provided inside the derrick; Connecting to the winch part of the other side of the drill floor via a test jig, and a test jig disposed at a lower portion of a connection structure of the rotary table installed on the drill floor, and hanging from the test jig and the top drive below the traveling block. Connecting the supermax rope between the lifting hangers, winding the drill line with the winch to apply a load to the derrick, main measurements measured by a load cell installed at the deadline anchor, and the supermax rope Comparing the auxiliary measurement measured by the load cell provided in the State measurement or test derrick load comprises the step of verifying whether or not the auxiliary measurement is based has a value within the set range can be provided.

In addition, the test jig may be disposed where a diverter previously removed from the connection structure of the rotary table is removed.

In addition, at least one of the deadline anchor and the winch may be fixed to the drill floor.

In addition, any one or more of the strain sensor installed on the hull portion including a drill floor, an auxiliary structure below the drill floor, the main deck, a rotary table installed on the drill floor, a connection structure below the rotary table and a strain sensor installed on the derrick The method may further include measuring the deformation amount.

In the embodiment of the present invention, since the load test is carried out by mounting the derrick on the offshore structure, it is possible to perform the derrick load test during the actual operation, which is due to the winch part, the deadline anchor, the traveling that receives the load in the derrick Not only can the load verification of blocks, top drives, etc. be performed effectively, but also the structural strength of the drill floor and auxiliary structures that support the derrick structure.

1 is a diagram illustrating a conventional derrick test structure for a load test,
2 illustrates a derrick test structure for a load test in accordance with an embodiment of the present invention;
3 is a flowchart illustrating a process of performing a load test using the derrick test structure of FIG. 2;
4 is a diagram illustrating a test jig of a derrick test structure according to another embodiment of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a derrick test structure for a load test according to an embodiment of the present invention.

Referring to FIG. 2, the present embodiment is applicable to any ship structure having a derrick 310 in an offshore structure, a drillship, or a hull structure. Hereinafter, it will be described based on the marine structure for ease of explanation.

 The derrick 310 may be mounted on a drill floor 220 positioned on the main deck 210 of the offshore structure. The drill floor 220 may be located at a height spaced apart from the main deck 210 by the auxiliary structure 230 provided in the main deck 210, a derrick through a supporter (not shown) 310 may be fixed.

A deadline anchor 221 may be installed on one side of the derrick 310, and a winch 222 may be installed on the other side of the derrick 310.

Here, the winch unit 222 may refer to a large-capacity position device or draw work that generates a driving force necessary for exchanging the drilling pipe, lifting the top drive 340, and the like during the drilling operation.

In this case, a first load cell 224 may be installed between the deadline anchor 221 and the drill floor 220.

The first load cell 224 may serve to obtain a load applied to the deadline anchor 221 or the drill line 320 as a main measurement during the derrick load test.

The first load cell 224 may be connected to a data logger and a derrick load test computer device (not shown).

One side of the drill line 320 is fixed or connected to the deadline anchor 221, the other side of the drill line 320 via the derrick 310 via one side of the sheave block (dotted line) provided in the derrick 310. Afterwards, it may be connected to or via the traveling block 330 provided inside the derrick 310 in the form of a moving pulley, and finally extended to the winch part 222 through the other sheave block (dotted line). The drill line 320 may be connected similarly or identically to the wire rope living method of the actual derrick 310. Accordingly, the winch unit 222 may serve to raise or lower the traveling block 330 connected to the drill line 320 by winding or unwinding the drill line 320.

The top drive 340 may be installed below the traveling block 330.

A lifting hanger 350 may be installed at a lower portion of the top drive 340, and one end of a super max rope 360 may be connected to the lifting hanger 350. .

The middle portion of the supermax rope 360 may extend downward through the drill floor 220. In addition, a block loader 370 for distributing the load may be provided at the other end of the supermax rope 360.

The block loader 370 may include a plurality of second load cells 380, and each second load cell 380 may be connected to be pulled by a plurality of sling wire assemblies 390.

Here, each second load cell 380 may play a role for acquiring a load applied to the block loader 370 or the sling wire assembly 390 as an auxiliary measurement during the derrick load test. Each second load cell 380 may also be connected to a derrick load test computer device via a data logger.

A plurality of strain sensor 301, 302, 303, 304 is connected to the data logger of the derrick load test computer device, each of the deformation amount of the plurality of hull portion associated with the derrick 310 or derrick 310 during the derrick load test The measured hull strain measurements can be configured to be entered into a derrick load test computer device.

Here, the strain sensors 301, 302, 303, 304 may be LBSG (Long-Based Strain Rate Gauge) sensors and the like, and include a Linear Variable Differential Transducer (LVDT) for converting displacement into electrical quantity. Can be used with an amplifier.

In addition, the plurality of hull portions in which the strain sensor 301, 302, 303, 304 are installed are the derrick 310, the drill floor 220, the auxiliary structure 230 under the drill floor 220, and the main deck 210. And so on.

In addition, the sling wire assembly 390 may be connected to sheaves of a plurality of lugs (sheave & lug) 211 installed on the main deck 210 with a sheave each.

The process of performing the load test of the derrick using the derrick test structure as described above will be described schematically.

First, the operator operates the winch unit 222 according to a predetermined derrick rod test procedure.

The winch part 222 winds up the drill line 320 to generate a load to raise the traveling block 330 connected to the drill line 320.

In this case, the first load cell 224 obtains the load on the deadline anchor 221 or the drill line 320 as the main measurement, and inputs the main measurement to the derrick load test computer device through the data log.

At the same time, the second load cell 380 also obtains the load on the block loader 370 or sling wire assembly 390 as an auxiliary measurement and inputs the auxiliary measurement to the derrick load test computer device via the data log.

The reason why the derrick load test computer device compares the load values of the primary measurement value and the secondary measurement value may be to determine whether the first load cell 224 or the second load cell 380 is malfunctioning.

The derrick load test computer device is responsible for determining whether the main measurement value or the auxiliary measurement value has a similar value within a preset range, and can verify whether the load is correctly applied to the derrick 310 according to the result.

At this time, the derrick load test may be performed by verifying whether the main measurement value and the auxiliary measurement value have a value within a preset range. In addition, the derrick load test computer device receives a hull strain measurement value input from a plurality of strain sensor through a data logger, and not only the derrick 310 but also a part of the hull associated with the derrick 310, for example, the drill floor 220. In addition, the structural strength of the auxiliary structure 230 and the main deck 210 under the drill floor 220 may be verified.

3 is a flowchart illustrating a process of performing a load test using the derrick test structure of FIG. 2.

2 and 3, the derrick 310 may be fixed and installed using a supporter on the drill floor 220 of the offshore structure (S302).

The drill floor 220 may be located at a height spaced a predetermined distance through the auxiliary structure 230 provided in the main deck 210.

The drill line 320 for a load test may be installed on the drill floor 220 as described above (S304), and thereafter, the lifting of the derrick 310 on the main deck 210 positioned below the drill floor 220. Connecting the structure (S306, S308, S310, S312) may proceed.

Here, the lifting structure of the derrick 310 is a traveling block 330, a top drive 340, a lifting hanger 350, a supermax rope 360, a block that can be raised or lowered by the drill line 320 The loader 370, the second load cell 380, the sling wire assembly 390, and the like may be included.

First, according to step S304, the drill line 320 may be connected between the deadline anchor 221 and the winch unit 222. For example, one end of the drill line 320 may be fixedly connected to the deadline anchor 221 installed on one drill floor 220 of the derrick 310. In addition, an intermediate portion of the drill line 320 may extend through the sheave block of the derrick 310 and then be connected to or via the traveling block 330. Finally, the other end of the drill line 320 may be connected to the winch part 222 installed on the other drill floor 220 of the derrick 310.

On the other hand, according to step S306, a plurality of lugs (sheave & lug, 211) that can be connected to the sling wire assembly 390 on the main deck 210 may be installed along a predetermined interval.

In addition, according to step S308, it is possible to install a block loader 370 that can be connected to the top drive 340 installed in the lower portion of the traveling block 330.

Here, the traveling block 330 may be connected to an intermediate portion of the drill line 320, and a top drive 340 may be provided below the traveling block 330.

In addition, according to step S310, after installing a plurality of sling wire assembly 390 connected to each of the second load cell 380 provided in the block loader 370 as described above, the sling wire assembly 390 Each sheave may be connected to the sheaves of a plurality of lugs 211 installed on the main deck 210, respectively.

In addition, according to step S312, the lifting hanger 350 may be installed below the top drive 340 as described above. One end of the supermax rope 360 may be connected to the lifting hanger 350, and the other end thereof may be connected to the block loader 370.

Thereafter, by operating the winch part 222 installed on the drill floor 220 and pulling the drill line 320, a load may be applied to the derrick structure (S314).

By comparing the main and secondary measurements measured in the load cells 224 and 380 of the deadline anchor 221 or the sling wire assembly 390 of the derrick structure as described above, it is determined whether the load cells 224 and 380 are malfunctioning. And can have confidence in the primary or secondary measurement.

In addition, it is possible to verify whether the load is correctly applied to the derrick 310 by determining whether the main measurement value or the auxiliary measurement value has a similar value within a preset range (S316).

The derrick support structure may include a drill floor 220 supporting the derrick 310, an auxiliary structure 230 under the drill floor 220, a main deck 210, and the like.

In addition, by using a plurality of strain sensor 301, 302, 303, 304 installed on the derrick 310, the drill floor 220, the auxiliary structure 230 below the drill floor 220, the main deck 210, During the derrick load test, the deformation amount of the hull associated with the derrick 310 may be measured (S318).

Thus, in this embodiment, after the derrick 310 is installed in the offshore structure, the winch 222 connected to the drill line 320 is operated to apply a load to the derrick structure, and the deadline anchor to which the drill line 320 is connected. 221 and / or the block loader 370 is effectively performing the derrick load test using the measurements measured in the load cells (224, 380) of the sling wire assembly 390 is connected, and also supports the derrick 310 The amount of deformation of the hull can be verified.

On the other hand, Figure 4 is a diagram illustrating a test jig of the derrick test structure according to another embodiment of the present invention.

2 and 4, the load test may be performed on the rotary table 510 using the test jig 530.

Here, the rotary table 510 may be installed on the drill floor 220, and may mean equipment for rotating the drill pipe.

In order to perform the derrick load test using the rotary table 510, the block loader 370 and the sling wire assembly 390 are connected to the plurality of lugs 211 installed on the main deck 210 as described above. Instead of the top drive 340, the lifting hanger 350, and the supermax rope 360, which are in turn suspended from the traveling block 330, the supermax rope 360 extends through the rotary table 510. It can be done.

In addition, the operator may arrange the test jig 530 under the connection structure 520 of the rotary table 510 previously installed on the drill floor 220 by using a crane (not shown) provided in the offshore structure. have. In particular, the test jig 530 may be disposed where a diverter (not shown), which is previously installed under the connection structure 520 of the rotary table 510, is removed.

The supermax rope 360 extending through the rotary table 510 may be connected to the test jig 530 with the third load cell 381 interposed therebetween.

The third load cell 381 may also be connected to the derrick load test computer device via a data log.

The test jig 530 may be connected to the supermax rope 360 through a lug 540 including a shackle provided thereon.

As described above, the load is generated in accordance with the operation of the winch portion 222, that is, as the winch portion 222 winds up the drill rail 320 and a load corresponding to the load is applied to the third load cell 381. Can be delivered.

In this case, the derrick load test computer device compares the main measurement measured at the first load cell 224 related to the deadline anchor 221 with the auxiliary measurement measured at the third load cell 381, thereby ensuring reliability of the measured value. Alternatively, it may be determined whether the load cell malfunctions, and whether the primary measurement value or the secondary measurement value has a similar value within a preset range may also verify whether the load is correctly applied to the derrick 310.

When the derrick rod test method as described above is described schematically, the derrick 310 is installed on the drill floor 220 of the offshore structure, and the drill line 320 for the rod test is installed on the drill floor 220 and the derrick 310. Can be installed to connect.

In addition, a lifting structure (ie, the traveling block 330, the top drive 340, the lifting hanger 350, and the supermax rope 360) that may be lifted or lowered by the drill rail 320 in the derrick 310. , Including the third load cell 381, etc., the end of the supermax rope 360 may be connected to the test jig 530 through the rotary table 510.

Next, after operating the winch 222 connected to one end of the drill line 320 to apply a load to the derrick 310 by the load of the test jig 530, the deadline anchor connected to the other end of the drill line 320 By comparing the main measurement measured at 221 and the auxiliary measurement obtained through the test jig 530 and the third load cell 381, it is possible to confirm the reliability of the measurement or determine whether there is a load cell malfunction.

In addition, by verifying whether the primary measurement value or the secondary measurement value is within a predetermined range, the derrick load test can be effectively performed.

Meanwhile, the hull portion in which the strain sensor is installed according to the present embodiment may further include a rotary table 510 or a connection structure 520 under the rotary table 510.

That is, another strain sensor (not shown) similar to the plurality of strain sensors 301, 302, 303, and 304 described with reference to FIG. 2 is also connected to the rotary table 510 or the rotary structure 520 under the rotary table 510. In addition, it can even verify the structural strength of hull sections during derrick road testing.

Through the embodiment of the present invention as described above, since the derrick load test can be performed during actual operation, the load verification of each equipment (ie, winch part, deadline anchor, traveling block, top drive, etc.) receiving the load in the derrick Not only can we perform this effectively, but we can also verify the structural strength of the drill floor and auxiliary structures supporting the derrick structure.

As described above as a specific embodiment of the derrick rod test method according to an embodiment of the present invention, this is only an example, the present invention is not limited to this, it is interpreted to have the broadest range in accordance with the basic idea disclosed herein Should be. Those skilled in the art can easily change the material, size, etc. of each component according to the application field, and can be combined / substituted the disclosed embodiments to implement a pattern of a timeless shape, but this also does not depart from the scope of the present invention will be. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

210: Main Deck 211: Rugs
220: drill floor 221: deadline anchor
222: winch unit 230: auxiliary structure
310: Derrick 320: Drill Line
330: Traveling Block 340: Top Drive
350: lifting hanger 360: supermax rope
370: block loader 380: tension load cell
390: sling wire assembly 510: rotary table

Claims (6)

Where the derrick is installed on the drill floor of the offshore structure,
Connecting the derrick rod test drill line to a winch part of the other side of the drill floor via a traveling block provided inside the derrick from a deadline anchor on one side of the drill floor;
Connecting the lifting structure of the derrick between a main deck located below the drill floor and the traveling block;
Winding the drill line with the winch to apply a rod to the derrick;
Comparing a main measurement measured by a load cell installed in the deadline anchor with an auxiliary measurement measured by a load cell provided in the lifting structure;
Verifying whether the primary measurement or the secondary measurement has a value within a preset range;
How to test derrick loads.
The method of claim 1,
The lifting structure,
Connected to a plurality of lugs installed on the main deck
How to test derrick loads. Where the derrick is installed on the drill floor of the offshore structure,
Connecting the derrick rod test drill line to a winch part of the other side of the drill floor via a traveling block provided inside the derrick from a deadline anchor on one side of the drill floor;
A test jig is disposed below the connection structure of the rotary table installed on the drill floor,
A supermax rope is connected between the test jig and a lifting hanger hanging on the top drive below the traveling block;
Winding the drill line with the winch to apply a rod to the derrick;
Comparing a main measurement value measured by a load cell installed in the deadline anchor with an auxiliary measurement value measured by a load cell provided in the supermax rope;
Verifying whether the primary measurement or the secondary measurement has a value within a preset range;
How to test derrick loads.
The method of claim 3, wherein
The test jig,
Characterized in that the position is removed from the diverter (diverter) previously installed in the lower portion of the connection structure of the rotary table
How to test derrick loads.
The method according to claim 1 or 3,
At least one of the deadline anchor and the winch portion,
Fixedly installed on the drill floor
How to test derrick loads.
The method according to claim 1 or 3,
At least one of a strain sensor installed on the hull portion including the drill floor, an auxiliary structure below the drill floor, a main deck, a rotary table installed on the drill floor, and a connection structure below the rotary table, and a strain sensor installed on the derrick. Further comprising the step of measuring the amount of deformation
How to test derrick loads.

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