CN114858435A - Tension experiment method suitable for semi-submersible production platform riser lifting system - Google Patents
Tension experiment method suitable for semi-submersible production platform riser lifting system Download PDFInfo
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- CN114858435A CN114858435A CN202210529806.4A CN202210529806A CN114858435A CN 114858435 A CN114858435 A CN 114858435A CN 202210529806 A CN202210529806 A CN 202210529806A CN 114858435 A CN114858435 A CN 114858435A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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Abstract
The invention discloses a tension test method suitable for a riser lifting system of a semi-submersible production platform, which is characterized in that bearing lifting lugs are arranged on two sides of a riser suspension device in the semi-submersible production platform, a tension test rigging combination is connected with a top deck of the riser lifting system, the connection of the bearing lifting lugs and the tension test rigging combination is completed, a winch or an anchor machine control system is used for increasing the load of a cable or an anchor chain, and the tension test method is compared with a tension value given out in the tension test rigging combination, so that the tension test of the riser lifting system is realized; the method makes full use of the semi-submersible platform hull riser suspension device, and realizes the test of the overall capacity of the riser lifting system through proper local transformation. The damage risk to the semi-submersible platform hull introduced by lifting heavy buoyancy tanks and other modes is avoided, and meanwhile, the construction period and the cost of the whole capability test are greatly saved.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a tension test method suitable for a semi-submersible production platform riser lifting system.
Background
Deepwater semi-submersible production platforms have gained increasing engineering applications globally as the major deepwater oil and gas development equipment in the world. Generally, a deepwater semi-submersible production platform needs to be matched with a deepwater riser to form a large mode for deepwater oil and gas resource development. The deepwater riser is primarily used for transport of production media between an underwater production facility and a floating platform.
As a typical deep water riser type, a steel catenary riser (hereinafter referred to as SCR) has the characteristics of strong adaptability to the movement of a floating body and relatively simple structure. The SCR is usually located outside the vessel using a dedicated suspension device, while riser lift in place is performed using a dedicated riser lift system. Riser lifting systems are typically designed in the form of a skid, and include a series of equipment and control systems such as winches/anchors, etc., and also have multiple specialized interfaces with the platform, so that the overall performance test can be performed after the riser lifting systems are assembled with the platform. For a deepwater SCR lifting system, the design capability of the deepwater SCR lifting system needs to consider various types of dynamic working conditions and extreme working conditions of SCR, so that the capability of a riser lifting system can reach the level of hundreds of tons, and the whole lifting system can meet the actual offshore operation capability requirement through actual tests. Meanwhile, after the riser lifting system is installed on the platform, equipment and schemes which can be used for testing are limited by various conditions, and the testing difficulty is further increased.
Disclosure of Invention
The invention aims to provide a tension test method suitable for a semi-submersible production platform steel catenary riser lifting system on the basis of fully utilizing the existing facilities of a semi-submersible platform hull.
In order to solve the technical problem, the invention provides a tension test method suitable for a semi-submersible production platform riser lifting system, which comprises the following steps of:
s1: assembling test equipment: installing a temporary connecting cable at the free end of a cable or an anchor chain of the riser hoisting system, connecting a top deck of the riser hoisting system to finish a tension test rigging combination, and installing bearing lifting lugs at two sides of a riser suspension device in the semi-submersible production platform;
s2: lifting the temporary connecting cable to a top deck of the riser lifting system by using a crane;
s3: removing the temporary connecting cable, and connecting the tension test rigging combination with a cable or an anchor chain of the riser hoisting system;
s4: lowering the tension test rigging combination to the bottom of the riser hoisting system by using a crane;
s5: removing the connection between the crane and the tension test rigging combination, continuously lowering a vertical pipe lifting system cable or an anchor chain to the position near the vertical pipe suspension device, and completing the connection between the tension test rigging combination and the force-bearing lifting lug;
s6: slowly increasing the load of the cable or the anchor chain through a winch or anchor machine control system, monitoring the change of the tension numerical value in a local display system in real time, comparing the change with the tension value given in the tension test rigging combination, and finishing the tension test when the change of the tension value is maintained in a range of-3% to +3% within 9 to 11 minutes.
According to a preferred embodiment of the invention, the riser suspension device with the smallest angle to the riser hoisting system lowering line should be selected before said step S1.
According to the preferred embodiment of the present invention, in step S1, the position and angle of installation of the messenger lugs on both sides of the riser suspension are determined through three-dimensional simulation.
According to a preferred embodiment of the present invention, in step S1, a reinforcement structure should be installed inside the riser suspension device according to the result of the computational simulation analysis.
According to the preferred embodiment of the present invention, between the steps S1 to S2, the overall functionality of the riser lifting system is tested to ensure that the devices of the riser lifting system are functional.
According to the preferred embodiment of the present invention, between the steps S5 to S6, the connection firmness is checked to ensure the connection safety.
According to a preferred embodiment of the present invention, after said step S6, the tensile test rigging combination should be removed and recovered by a reverse step.
The invention has the technical effects that:
1. the invention relates to a tension test method suitable for a riser lifting system of a semi-submersible production platform, which fully utilizes a riser suspension device of the semi-submersible production platform, installs bearing lifting lugs at two sides of the riser suspension device in the semi-submersible production platform, connects a tension test rigging combination with a top deck of the riser lifting system, completes the connection of the bearing lifting lugs and the tension test rigging combination, increases the load of a cable or an anchor chain through a winch or an anchor machine control system, and compares the load with a tension value given in the tension test rigging combination, thereby realizing the tension test of the riser lifting system.
2. The tension test method suitable for the semi-submersible production platform riser lifting system realizes the test of the overall capacity of the riser lifting system through appropriate local transformation of the semi-submersible production platform riser suspension device, avoids the damage risk of a semi-submersible platform hull caused by lifting a heavy buoyancy tank and the like, and greatly saves the construction period and the cost of the overall capacity test.
Drawings
FIG. 1 is a schematic diagram of a tension test method of the present invention suitable for use in a semi-submersible production platform riser lift system;
FIG. 2 is a partial schematic view of a tension testing method of the present invention suitable for use in a semi-submersible production platform riser lift system;
FIG. 3 is a front view of a force-bearing lifting lug of a tension test method suitable for a riser lifting system of a semi-submersible production platform according to the invention;
FIG. 4 is a side view of a force-bearing lifting lug of a tension test method suitable for a riser lifting system of a semi-submersible production platform according to the invention;
FIG. 5 is a cross-sectional view of a force-bearing lifting lug of a tension test method suitable for a semi-submersible production platform riser lifting system.
Reference numerals: 1-a riser lift system; 2-a chain or cable; 3-winch or anchor machine control systems; 4-bearing and standing the lifting lug; 5-vertical rigging; 6-a stay bar; 7-oblique rigging; 8-tensiometer combination; 9-reinforcing the structure.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in fig. 1 to 5, the tension test method for the riser lifting system of the semi-submersible production platform according to the present invention comprises the following steps:
the first step is as follows: selecting a suspension device with the smallest included angle with a cable placed under a riser lifting system 1 from riser suspension devices on a semi-submersible production platform hull;
the second step is that: determining the positions and angles of the bearing lifting lugs 4 arranged on the two sides of the vertical pipe suspension device through three-dimensional simulation, prefabricating and welding the bearing lifting lugs 4 to the two sides of the vertical pipe suspension device, and arranging a reinforcing structure 9 on the inner side of the vertical pipe suspension device according to a calculation simulation analysis result;
the third step: installing a temporary connecting cable at the end part of a cable or an anchor chain 2 of the riser hoisting system, and lowering the cable or the anchor chain 2 of the riser hoisting system to a certain height;
the fourth step: two sets of vertical riggings 5, support rods 6, two sets of inclined riggings 7 and a tensiometer combination 8 are connected on a top deck of a semi-submersible production platform riser lifting system 1 to form a tension test rigging combination;
the fifth step: lowering a platform crane hook, connecting a hoisting system cable or a temporary connecting cable of an anchor chain 2, and hoisting the platform crane hook to a top deck of the riser hoisting system 1;
and a sixth step: removing the temporary connecting cable, and connecting the tensiometer combination 8 with a lifting system cable or an anchor chain 2;
the seventh step: a platform crane is adopted to lift the tension test rigging combination, the combination is lowered to the bottom of the vertical pipe lifting system 1, and the connection between a crane hook and the tension test rigging combination is released;
eighth step: continuously lowering a lifting system cable or an anchor chain 2 to be close to a semi-submersible production platform hull riser suspension device;
the ninth step: connecting two clamping rings at the tail end of the tension test rigging combination with the force-bearing lifting lug 4 by a diver;
the tenth step: slowly increasing the load of the cable or the anchor chain 2 through a winch or anchor machine control system 3, monitoring the change of the tension value in real time in a local display system, and comparing the change with the tension value given by a tensiometer combination 8 to ensure that the difference is within a reasonable range;
the eleventh step: and continuously increasing the load of the cable or the anchor chain 2 until the expected load of the test is kept unchanged, maintaining for a certain time, monitoring the change of the numerical value in the local display system and tensiometer combination 8, and determining that the tension test is passed when the tension change amplitude is maintained in a reasonable range in a set time range.
As shown in fig. 1 to 5, the tension test method for the riser lifting system of the semi-submersible production platform according to the present invention may further include the following steps:
the first step is as follows: in the land prefabrication process of the semi-submersible production platform hull, the force bearing lifting lugs 4 and the vertical pipe suspension device reinforcing structure 9 are installed in place according to the design scheme and are qualified through inspection;
the second step is that: prefabrication and assembly of the riser lifting system 1 are completed on land (including integration of a winch or an anchor machine control system 3 and other necessary equipment), a lifting system anchor chain or a cable 2 is installed on the anchor machine or the winch, and the integral function test of the riser lifting system 1 and the function test of the winch or the anchor machine control system 3 are carried out, so that the functions of all the equipment of the riser lifting system 1 are ensured to be complete;
the third step: installing a temporary connecting cable at the end part of the hoisting system cable or the anchor chain 2, and lowering the hoisting system cable or the anchor chain 2 to a certain height;
the fourth step: connecting a vertical rigging 5, a stay bar 6, an inclined rigging 7 and a tensiometer combination 8 on a top deck of a riser lifting system 1 of a semi-submersible production platform to form a tension test rigging combination;
the fifth step: lowering a platform crane hook, connecting a hoisting system cable or a temporary connecting cable of an anchor chain 2, and hoisting the platform crane hook to a top deck of the riser hoisting system 1;
and a sixth step: removing the temporary connecting cable, and connecting the tensiometer combination 8 with a lifting system cable or an anchor chain 2;
the seventh step: a platform crane is adopted to lift the tension test rigging combination, the combination is lowered to the bottom of the vertical pipe lifting system 1, and the connection between a crane hook and the tension test rigging combination is released;
eighth step: continuously lowering a lifting system cable or an anchor chain 2 to be close to a semi-submersible production platform hull riser suspension device;
the ninth step: connecting two clamping rings at the tail end of the tension test rigging combination with the force-bearing lifting lug 4 by a diver;
the tenth step: slowly increasing the load of the cable or the anchor chain 2 through a winch or anchor machine control system 3, monitoring the change of the tension value in real time in a local display system, and comparing the change with the tension value given by a tensiometer combination 8 to ensure that the difference is within a reasonable range;
the eleventh step: and (3) continuously increasing the load 2 of the cable or the anchor chain until the expected load of the test is kept unchanged, maintaining for a certain time, monitoring the change of numerical values in the winch or anchor machine control system 3 and the tensiometer combination 8, and determining that the tension test is passed when the tension change amplitude is maintained in a reasonable range in a set time range.
The twelfth step: after the test is passed, the test rigging is removed and the repeat is recovered by reversing the procedure.
Wherein the set time range is 9 to 11 minutes, and the reasonable range is-3% to + 3%. The winch or anchor machine control system 3 has a tension local real-time display function; the tensiometer assembly 8 has a tension value remote display function, and is convenient to compare with a tension display value of the winch or anchor machine control system 3.
As shown in fig. 2, the tension test rigging combination comprises vertical rigging 5 (two sets), a stay bar 6, oblique rigging 7 (two sets), and a tensiometer combination 8, wherein the force-bearing lifting lugs 4 are connected with the vertical rigging 5, the vertical rigging 5 is connected with the set lifting lugs on the stay bar 6, another pair of lifting lugs on the stay bar 6 is connected with the oblique rigging 7, and finally the oblique rigging 7 is connected with the cable or anchor chain 2 of the riser hoisting system through the tensiometer combination 8.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A tension test method suitable for a semi-submersible production platform riser lifting system is characterized by comprising the following steps:
s1: assembling test equipment: installing a temporary connecting cable at the free end of a cable or an anchor chain of the riser hoisting system, connecting a top deck of the riser hoisting system to finish a tension test rigging combination, and installing bearing lifting lugs at two sides of a riser suspension device in the semi-submersible production platform;
s2: lifting the temporary connecting cable to a top deck of the riser lifting system by using a crane;
s3: removing the temporary connecting cable, and connecting the tension test rigging combination with a cable or an anchor chain of the riser hoisting system;
s4: lowering the tension test rigging combination to the bottom of the riser hoisting system by using a crane;
s5: removing the connection between the crane and the tension test rigging combination, continuously lowering a vertical pipe lifting system cable or an anchor chain to the position near the vertical pipe suspension device, and completing the connection between the tension test rigging combination and the force-bearing lifting lug;
s6: slowly increasing the load of the cable or the anchor chain through a winch or anchor machine control system, monitoring the change of the tension numerical value in a local display system in real time, comparing the change with the tension value given in the tension test rigging combination, and finishing the tension test when the change of the tension value is maintained in a range of-3% to +3% within 9 to 11 minutes.
2. The method of claim 1, wherein prior to step S1, the riser suspension device is selected to have the smallest angle with respect to the lowering line of the riser hoisting system.
3. The tension test method for the semi-submersible production platform riser hoisting system according to claim 1, wherein in step S1, the position and angle of installation of the force-bearing lifting lug on both sides of the riser suspension device are determined by three-dimensional simulation.
4. The tension testing method for the riser hoisting system of the semi-submersible production platform according to claim 1, wherein in step S1, a reinforcing structure is further installed inside the riser suspension device according to the calculation and simulation analysis result.
5. The tension testing method for the riser lifting system of the semi-submersible production platform as claimed in claim 1, wherein the overall functionality of the riser lifting system is tested between steps S1 and S2 to ensure that the devices of the riser lifting system are functional.
6. The tension testing method for the semi-submersible production platform riser lifting system according to claim 1, wherein the connection firmness is checked to ensure the connection safety between the steps S5 and S6.
7. The tension testing method for the semi-submersible production platform riser hoisting system according to claim 1, wherein after the step S6, the tension testing rigging combination is removed and recovered by a reverse step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210529806.4A CN114858435A (en) | 2022-05-16 | 2022-05-16 | Tension experiment method suitable for semi-submersible production platform riser lifting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210529806.4A CN114858435A (en) | 2022-05-16 | 2022-05-16 | Tension experiment method suitable for semi-submersible production platform riser lifting system |
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