Landing string design and strength check in ultra-deepwater condition

Zhang, Hui; Gao, Deli; Tang, Haixiong

doi:10.1016/j.jngse.2010.05.006

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Bradford et al used five sets of deepwater landing string hangers to perform caving tests on a tubular column, including elastic load tests near yield strength and overload tests beyond yield strength, to determine wellhead stresses on a tubular column during deepwater drilling when lowering a heavy tubular string [5]. Zhang H. et al proposed a tension load-based design method for the descent riser [6]. Gao D. et al considered the characteristics of deepwater environmental loads and non-segregating water pipe operations, mainly focusing on axial static loads for design.…”

Section: Introductionmentioning

confidence: 99%

Load Calculation and Strength Analysis of the Deepwater Landing Drill Pipe-Lowering Operation

He,

Wang,

Wang

et al. 2024

Energies

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A landing string is directly exposed to seawater and subjected to significant stresses and complex deformations due to environmental loads such as wind, waves, and ocean currents during the phase in which the drill string carries the casing to the wellhead. Meanwhile, as the water depth increases, the weight of the drill string increases, leading to an increase in the tensile loads borne by the drill string, which can easily cause a risk of failure. Therefore, a quasi-static load calculation model for the deepwater insertion of the pipe column was established. Using the Ansys platform, simulations were conducted for average wind, wave, and ocean current conditions during different months throughout the year. The ultimate loads and stress distributions of the string were derived from theoretical analyses and numerical simulations for different operational sea states, and the suggested safe operating window and desired BOP trolley restraining reaction force for landing strings’ lowering are given according to the existing industry standards. The research findings can help in identifying the potential risks and failure modes of the deepwater landing string under different working conditions.

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Section: Introductionmentioning

confidence: 99%

Load Calculation and Strength Analysis of the Deepwater Landing Drill Pipe-Lowering Operation

He,

Wang,

Wang

et al. 2024

Energies

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“…limit and overload tests beyond the yield limit, to determine the stresses on the column at the wellhead during deepwater drilling when a heavy tubular string is lo In 2010, Zhang Hui et al [15] established a static model of the string during dee catheter injection installation, gave calculation methods, derived the deformati stress distribution law of the tubular column, and proposed a corresponding optim plan for the drilling sting structure. In 2012, Gao Deli et al [16] elaborated the longi and transverse bending deformation mechanical model and longitudinal vibration of the landing string, analyzed the factors affecting the deformation of the string variation law, and proposed the strength design and calibration method of the string.…”

Section: Introductionmentioning

confidence: 99%

Loads Calculation and Strength Calculation of Landing String during Deepwater Drilling

et al. 2023

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As an important drilling tool, the landing string will be directly exposed to seawater during surface riserless drilling operations, and it will undergo complex deformation under the action of environmental loads such as ocean currents and waves and the displacement, heave and vibration of the drilling platform. At the same time, with the increase in water depth, the floating weight of drill pipe and casing also increases significantly, and the landing string will bear great tensile loads, which can easily cause accidents. Therefore, in this paper, based on ANSYS software, the finite element analysis models of three stages of the landing string lowering operation were established, and finite element simulations under different combinations of working conditions were carried out. Through theoretical analysis and numerical simulation, the ultimate load and stress distribution of the string under different operating sea conditions were obtained, and the external force requirements for restraining the lateral displacement of the string were proposed according to the existing standards of the industry. Thereby, the recommended safe operating time, safe operating conditions window and the required restraint reaction force of the support mechanism are given for landing string lowering operation throughout the year.

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“…Beginning from the Gulf of Mexico in the 1960s, the running technology of jetting while drilling concerning surface conductors has undergone a complicated development process. The conductor runs down into the hole by its own weight after jetting off the seabed soil [9]. Successful operation can greatly save time and money.…”

Section: Introductionmentioning

confidence: 99%

Modified Model for Shallow Soil Strength Recovery Calculation during Set-Up Periods of Jetted Conductor—A Case Study of Equatorial Guinea Bay Deep-Water Drilling

et al. 2021

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Jetted conductor setting depth is crucial for deep-water drilling. This paper presents an innovative method for determining the shallow soil resistance strength recovery factor based on the field data of Equatorial Guinea bay. It shows that the soil strength recovery factor of Equatorial Guinea bay is lower than that of the Gulf of Mexico. The conductor setting depth calculation referring to other place will have a high risk of wellhead sinking. According to the newly established designing charts, the conductor setting depth was recommended for the S1 well. Each preferred set-up period requires a specific setting depth. If the chosen set-up period is 2 days, the expected setting depth of a 36″ conductor should be 250 ft (76.2 m) and, similarly, 295 ft (89.9 m) for a 30″ conductor. The relationship between set-up period and surface conductor setting depth is established as well. Wellhead landed load appears to be the crucial factor for determining the conductor setting depth. The rationality of the newly developed shallow soil strength recovery model for the Equatorial Guinea deep-water block was also confirmed by the field data.

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Landing string design and strength check in ultra-deepwater condition

Cited by 5 publications

References 2 publications

Load Calculation and Strength Analysis of the Deepwater Landing Drill Pipe-Lowering Operation

Load Calculation and Strength Analysis of the Deepwater Landing Drill Pipe-Lowering Operation

Loads Calculation and Strength Calculation of Landing String during Deepwater Drilling

Modified Model for Shallow Soil Strength Recovery Calculation during Set-Up Periods of Jetted Conductor—A Case Study of Equatorial Guinea Bay Deep-Water Drilling

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