A method for testing a drawworks hook of a drillship drilling system

Abstract

The application discloses a kind of test methods of big hook of drilling and production ship drilling system, including step one, in the middle of the deck of semi-submersible ship, fixed installation lifting weight;Step two, according to test requirement, connect the lifting rig on the big hook of drilling and production ship drilling system;Step three, using tugboat to drag semi-submersible ship to harbor pit anchor fixing, then dive to the height required by test, step four, using tugboat to drag drilling and production ship to the top of semi-submersible ship;Step five, install limiting device at the position of four pontoons on both sides of the deck of semi-submersible ship;Step six, using wire rope to pass through moon pool and connect lifting weight on the deck of semi-submersible ship and lifting rig connected on the big hook of drilling and production ship drilling system, carry out test according to big hook test requirement, calculate the big hook tension value through the reading displayed on tension meter.The application can carry out big hook test on water, drilling and production ship does not need to re-enter dock and sit on pad, reduce construction cost, improve production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of ship inspection and testing, and specifically relates to a method for testing the hook of a drilling system on a drilling and production vessel. Background Technology

[0002] The drilling system of a drilling vessel is installed and commissioned at the dockside stage. The hook load test of the drilling system is a crucial step in the construction process. The hook of the drilling system is mainly used to lift drilling equipment such as the BOP (Bottom-of-Place) and requires a load test before being put into production. According to the requirements of the hook load test, the lifting slings need to pass through the center of the drilling rig to connect the counterweight. Because the drilling vessel is docked at the dock, the counterweight cannot be placed on the ground as it is on the slipway; moreover, because the moon pool area is a large open structure running vertically through the main hull, the counterweight cannot be placed on the main deck. Therefore, currently, after the dockside stage is completed, the drilling vessel needs to re-enter the dry dock for the drilling system hook test. Re-entering the drilling vessel for the dry dock increases construction costs and reduces production efficiency. Therefore, to address the shortcomings of the existing technology, it is necessary to improve it. Summary of the Invention

[0003] The purpose of this invention is to provide a method for testing the large hook of a drilling system on a drilling vessel, which enables the large hook test to be conducted on water without the drilling vessel needing to re-enter the dry dock, thereby reducing construction costs and improving production efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for testing the hook of a drilling system on a drilling vessel includes the following steps: Step 1: Securely install the lifting brackets in the middle of the deck of the semi-submersible vessel; Step 2: Connect the lifting slings to the large hook of the drilling system on the drilling vessel according to the test requirements; Step 3: Use tugboats to tow the semi-submersible vessel to the harbor basin sump and anchor it. Then, submerge it to the required test height. The water depth H of the sump should satisfy H≥h1+h2+h3+h4, where h1 is the height of the main deck of the semi-submersible vessel, h2 is the draft of the drilling vessel, h3 is the height from the bottom of the semi-submersible vessel to the bottom of the sump, and h4 is the height from the bottom of the drilling vessel to the deck of the semi-submersible vessel. Step 4: Use tugboats to tow the drilling rig above the semi-submersible vessel, aligning the drilling rig's moon pool with the lifting bracket in the middle of the semi-submersible vessel's deck, and secure the drilling rig to the semi-submersible vessel with cables. Step 5: Install limiting devices at the four pontoon positions on both sides of the semi-submersible vessel's deck. One end of the limiting device is fixedly connected to the longitudinal wall of the pontoon, and the other end of the limiting device abuts against the outer plate of the drilling vessel's side. Step Six: Use a steel wire rope to pass through the moon pool and connect the lifting weight on the semi-submersible deck to the lifting sling connected to the drilling system hook. Set up a tension gauge at the connection between the steel wire rope and the lifting weight, and conduct the test according to the hook test requirements. The hook provides an upward tension, and calculate the hook tension value by the reading displayed on the tension gauge.

[0005] As a preferred embodiment of the above-mentioned test method for the drilling system hook of the drilling vessel, in step six, the wire rope is equipped with a first shackle and a second shackle. The wire rope is connected to the lifting weight on the deck of the semi-submersible vessel through the first shackle, and the wire rope is connected to the lifting sling on the drilling system hook through the second shackle. Multiple wire ropes connected to the lifting weight converge to the third shackle, and multiple wire ropes connected to the lifting weight are connected to the wire rope of the lifting sling through the third shackle.

[0006] As a preferred embodiment of the above-mentioned drilling system hook test method for drilling vessels, in step one, multiple lifting weights are fixedly installed in the middle of the deck of the semi-submersible vessel. In step six, a third shackle is also provided on the wire rope. Multiple wire ropes are connected to the lifting weights and slings respectively, and multiple wire ropes are connected to the third shackle.

[0007] As a preferred embodiment of the above-mentioned test method for the large hook of the drilling system of the drilling vessel, the limiting device is connected to the upper end of the pontoon.

[0008] As a preferred embodiment of the above-mentioned test method for the large hook of the drilling system of the drilling vessel, a bollard is provided at the upper end of the pontoon, and the drilling vessel is positioned and fixed by connecting the bollard with a cable.

[0009] As a preferred embodiment of the above-mentioned drilling system hook test method for drilling vessels, the limiting device includes a jacking fixture body and a jacking device. The jacking device is horizontally arranged on the jacking fixture body and is connected to a jacking rod. The jacking device can drive the jacking rod to extend and retract outward for adjustment.

[0010] As a preferred embodiment of the above-mentioned test method for the large hook of the drilling system of the drilling vessel, a rubber block is provided at the end of the push rod.

[0011] As a preferred embodiment of the above-mentioned test method for the large hook of the drilling system of the drilling vessel, the jacking device is a hydraulic jack.

[0012] The advantages of implementing the drilling vessel drilling system hook test method provided by this invention compared with the prior art are as follows: This invention involves towing a drilling rig above a semi-submersible vessel, allowing the semi-submersible to conduct a drilling system hook test during submersion. By fixing a lifting weight to the center of the semi-submersible's deck, a pulling point is provided for the drilling rig's hook. This solves the problem of not being able to place counterweights on land as is possible when the drilling rig is on the slipway, thus preventing hook testing. The semi-submersible is submerged to a sufficient height, greater than the sum of the semi-submersible's main deck height, the drilling rig's draft, the height from the semi-submersible's hull to the bottom of the sump, and the height from the drilling rig's hull to the semi-submersible's deck. This ensures that during the hook test, the upward pull of the lifting weight by the hook will not cause the bottom of the drilling rig to collide with the semi-submersible's deck, resulting in collision damage. The drilling rig's moon pool is aligned with the lifting weight in the center of the semi-submersible's deck. During the hook test, the steel wire rope can pass through the moon pool and connect to the lifting weight. The drilling vessel is fixed to the semi-submersible vessel by cables to ensure that the drilling vessel will not be swept away by the water flow during the hook test and to ensure test safety. One end of the limiting device is fixedly connected to the longitudinal wall of the pontoon, and the other end of the limiting device abuts against the outer side plate of the drilling vessel to ensure that the displacement of the drilling vessel relative to the semi-submersible vessel remains within the allowable range during the test. This method uses the lifting weight for the hook test fixed on the semi-submersible vessel to submerge the semi-submersible vessel to provide the tension point for the hook test. The semi-submersible vessel is submerged to a sufficient height to conduct the test, allowing the drilling vessel to conduct the hook test in the water. The drilling vessel does not need to re-enter the dry dock to sit on the pier, thereby reducing construction costs and improving production efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0014] Figure 1 This is a top-view schematic diagram of the drilling and production vessel of the present invention above the semi-submersible vessel; Figure 2 This is a schematic diagram of the semi-submersible vessel of the present invention submerging in a sinkhole; Figure 3 This is a schematic diagram of the large hook of the present invention connected to the lifting weight via a steel wire rope; Figure 4 yes Figure 3 A partially enlarged schematic diagram of the first shackle point; Figure 5 This is a schematic diagram of the limiting device of the present invention; Figure 6 This is a schematic diagram of the lifting bracket of the present invention; Figure 7 This is a top view of the mounting bracket of the present invention installed on the deck of a semi-submersible vessel.

[0015] Marked in the image: 100. Semi-submersible vessel; 110. Floating box; 120. Cable; 200. Drilling vessel; 210. Moon pool; 300. Lifting slings; 310. Wire rope; 400. Limiting device; 410. Main body of jacking tool; 420. Jacking device; 430. Jacking rod; 431. Rubber block; 500. First shackle; 510. Second shackle; 520. Third shackle; 530. Tension gauge; 600. Sedimentation pit; 700. Lifting weight. Detailed Implementation

[0016] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0020] Please refer to the following: Figures 1 to 7 The method for testing the hook of the drilling system of the drilling vessel provided in the embodiments of the present invention will now be described.

[0021] like Figures 1 to 7 As shown, the method for testing the hook of the drilling system of the drilling vessel 200 of the present invention includes the following steps: Step 1: Securely install the lifting bracket 700 in the middle of the deck of the semi-submersible vessel 100; Step 2: Connect the lifting sling 300 to the large hook of the drilling system on the drilling vessel 200 according to the test requirements; Step 3: Use tugboats to tow the semi-submersible vessel 100 to the harbor basin sinkhole 600 and anchor it. Then, submerge it to the required test height. The water depth H of the sinkhole 600 should satisfy H≥h1+h2+h3+h4, where h1 is the height of the main deck of the semi-submersible vessel 100, h2 is the draft of the drilling vessel 200, h3 is the height from the bottom of the semi-submersible vessel 100 to the bottom of the sinkhole 600, and h4 is the height from the bottom of the drilling vessel 200 to the deck of the semi-submersible vessel 100. Step 4: Use a tugboat to tow the drilling vessel 200 above the semi-submersible vessel 100, align the moon pool 210 of the drilling vessel 200 with the lifting bracket 700 in the middle of the deck of the semi-submersible vessel 100, and fix the drilling vessel 200 to the semi-submersible vessel 100 with the cable 120. Step 5: Install limiting devices 400 at the four pontoons 110 on both sides of the deck of the semi-submersible vessel 100. One end of the limiting device 400 is fixedly connected to the longitudinal wall of the pontoon 110, and the other end of the limiting device 400 abuts against the outer side plate of the drilling vessel 200. Step Six: Use wire rope 310 to pass through moon pool 210 and connect the lifting weight 700 on the deck of semi-submersible vessel 100 to the lifting sling 300 connected to the drilling system hook. Set up tension gauge 530 at the connection between wire rope 310 and lifting weight 700. Conduct the test according to the hook test requirements. The hook provides an upward pulling force. Calculate the hook pulling force value by the reading displayed on the tension gauge 530.

[0022] Moon Pool 210 is an opening structure that runs vertically through the main hull. Moon Pool 210 is the existing structure of the drilling and production vessel 200, and will not be described in detail here.

[0023] For example, in step six, the wire rope 310 is equipped with a first shackle 500 and a second shackle 510. The wire rope 310 is connected to the lifting weight 700 on the deck of the semi-submersible vessel 100 via the first shackle 500, and to the lifting sling 300 on the drilling system hook via the second shackle 510. The shackles can evenly distribute the force during lifting, avoiding local stress concentration that could cause the wire rope 310 to break during hook testing. Furthermore, the length of the wire rope 310 can be finely adjusted via the shackles to balance the center of gravity deviation of the lifted object and solve the problem of instability during lifting caused by center of gravity shift.

[0024] For example, in step one, multiple lifting brackets 700 are fixedly installed in the middle of the deck of the semi-submersible vessel 100. In step six, a third shackle 520 is also provided on the wire rope 310. The multiple wire ropes 310 are connected to the lifting brackets 700 and the sling 300 respectively, and the multiple wire ropes 310 are connected to the third shackle 520. The multiple wire ropes 310 connected to the lifting brackets 700 converge at the third shackle 520, and are connected to the wire ropes 310 connected to the sling 300 through the third shackle 520, which facilitates the adjustment of the length of the wire ropes 310.

[0025] For example, the limiting device 400 is connected to the upper end of the pontoon 110. When the semi-submersible vessel 100 is submerged, the upper end of the pontoon 110 is above the water surface. Connecting the limiting device 400 to the upper end of the pontoon 110 facilitates abutting against the outer side plate of the drilling vessel 200, ensuring that the displacement of the drilling vessel 200 relative to the semi-submersible vessel 100 remains within the allowable range during the test.

[0026] For example, a bollard is provided at the upper end of the pontoon 110. The drilling vessel 200 is connected to the fixed position of the bollard by a cable 120. The drilling vessel 200 is connected to the bollard by the cable 120, and the semi-submersible vessel 100 is anchored in the harbor basin sinkhole 600, so that the drilling vessel 200 is connected to the semi-submersible vessel 100 by the cable 120 and is prevented from being washed away by the water flow.

[0027] For example, the limiting device 400 includes a jacking fixture body 410 and a jacking device 420. The jacking device 420 is horizontally disposed on the jacking fixture body 410. The jacking device 420 is connected to a jacking rod 430, and the jacking device 420 can drive the jacking rod 430 to extend and retract outward for adjustment. The jacking device 420 drives the jacking rod 430 to extend outward to adjust the position of the jacking rod 430, so that the end of the jacking rod 430 abuts against the outer side plate of the drilling and production vessel 200. The extension and retraction adjustment can adapt to drilling and production vessels 200 of different sizes.

[0028] For example, the end of the push rod 430 is provided with a rubber block 431, which acts as a buffer to press against the outer side plate of the drilling vessel 200, thus preventing damage to the outer side plate of the drilling vessel 200.

[0029] For example, the jacking device 420 is a hydraulic jack. Since the drilling and production vessel 200 is relatively heavy, the use of a hydraulic jack as the jacking device 420 ensures the stability of the drilling and production vessel 200 during the hook test.

[0030] The advantages of implementing the large hook test method for the drilling system of a drilling and production vessel 200 provided by this invention compared with the prior art are as follows: This invention involves towing a drilling vessel 200 above a semi-submersible vessel 100, and using the semi-submersible vessel 100 to conduct a drilling system hook test. By fixing a lifting weight 700 to the middle of the semi-submersible vessel 100's deck, a pulling point is provided for the hook of the drilling vessel 200. This solves the problem that the counterweight cannot be placed on the ground as it is on the slipway when the drilling vessel 200 is in the water, thus preventing the hook test. The semi-submersible vessel 100 is submerged to a sufficient height, greater than the height of the main deck of the semi-submersible vessel 100, the draft of the drilling vessel 200, the height from the bottom of the semi-submersible vessel 100 to the bottom of the sinkhole 600, and the height from the bottom of the drilling vessel 200 to the deck of the semi-submersible vessel 100. This ensures that during the hook test, the upward pull of the hook on the lifting weight 700 will not cause the bottom of the drilling vessel 200 to collide with the deck of the semi-submersible vessel 100, thus preventing collision damage. The moon pool 210 of the drilling vessel 200 is aligned with the lifting weight 700 in the middle of the deck of the semi-submersible vessel 100. During the hook test, the wire rope 310 can pass through the moon pool 210 and connect to the lifting weight 700. The drilling vessel 200 is fixed to the semi-submersible vessel 100 by the cable 120 to ensure that the drilling vessel 200 will not be swept away by the water flow during the hook test and to ensure test safety. One end of the limiting device 400 is fixedly connected to the longitudinal wall of the pontoon 110, and the other end of the limiting device 400 abuts against the outer side plate of the drilling vessel 200 to ensure that the displacement of the drilling vessel 200 relative to the semi-submersible vessel 100 is always kept within the allowable range during the test. This method uses the lifting weight 700 for the hook test fixed on the semi-submersible vessel 100 to submerge the semi-submersible vessel 100 to provide the tension point for the hook test. The semi-submersible vessel 100 is submerged to a sufficient height to conduct the test, so that the drilling vessel 200 can conduct the hook test in the water. The drilling vessel 200 does not need to re-enter the dock to sit on the pier, thereby reducing construction costs and improving production efficiency.

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for testing the hook of a drilling system on a drilling vessel, characterized in that, Includes the following steps: Step 1: Securely install the lifting brackets in the middle of the deck of the semi-submersible vessel; Step 2: Connect the lifting slings to the large hook of the drilling system on the drilling vessel according to the test requirements; Step 3: Use tugboats to tow the semi-submersible vessel to the harbor basin sump and anchor it. Then, submerge it to the required test height. The water depth H of the sump should satisfy H≥h1+h2+h3+h4, where h1 is the height of the main deck of the semi-submersible vessel, h2 is the draft of the drilling vessel, h3 is the height from the bottom of the semi-submersible vessel to the bottom of the sump, and h4 is the height from the bottom of the drilling vessel to the deck of the semi-submersible vessel. Step 4: Use tugboats to tow the drilling rig above the semi-submersible vessel, aligning the drilling rig's moon pool with the lifting bracket in the middle of the semi-submersible vessel's deck, and secure the drilling rig to the semi-submersible vessel with cables. Step 5: Install limiting devices at the four pontoon positions on both sides of the semi-submersible vessel's deck. One end of the limiting device is fixedly connected to the longitudinal wall of the pontoon, and the other end of the limiting device abuts against the outer plate of the drilling vessel's side. Step Six: Use a steel wire rope to pass through the moon pool and connect the lifting weight on the semi-submersible deck to the lifting sling connected to the drilling system hook. Set up a tension gauge at the connection between the steel wire rope and the lifting weight, and conduct the test according to the hook test requirements. The hook provides an upward tension, and calculate the hook tension value by the reading displayed on the tension gauge.

2. The method for testing the hook of a drilling vessel drilling system according to claim 1, characterized in that, In step six, the wire rope is equipped with a first shackle and a second shackle. The wire rope is connected to the lifting weight on the deck of the semi-submersible vessel through the first shackle, and the wire rope is connected to the lifting sling on the drilling system hook through the second shackle.

3. The method for testing the large hook of the drilling system on a drilling vessel according to claim 2, characterized in that, In step one, multiple lifting brackets are fixedly installed in the middle of the deck of the semi-submersible vessel. In step six, a third shackle is also set on the wire rope. Multiple wire ropes are connected to the lifting brackets and the slings respectively. Multiple wire ropes are connected to the third shackle. Multiple wire ropes connected to the lifting brackets converge to the third shackle. Multiple wire ropes connected to the lifting brackets are connected to the wire ropes connected to the slings through the third shackle.

4. The method for testing the hook of a drilling vessel drilling system according to claim 3, characterized in that, The limiting device is connected to the upper end of the pontoon.

5. The method for testing the hook of a drilling vessel drilling system according to claim 4, characterized in that, The upper end of the pontoon is equipped with a bollard, and the drilling vessel is positioned and fixed by connecting the bollard with a cable.

6. The method for testing the hook of a drilling vessel drilling system according to claim 4, characterized in that, The limiting device includes a main body of the jacking fixture and a jacking device. The jacking device is horizontally arranged on the main body of the jacking fixture and is connected to a jacking rod. The jacking device can drive the jacking rod to extend and retract outward for adjustment.

7. The method for testing the hook of a drilling vessel drilling system according to claim 6, characterized in that, A rubber block is provided at the end of the push rod.

8. The method for testing the hook of a drilling vessel drilling system according to claim 6, characterized in that, The jacking device is a hydraulic jack.

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