Offshore oil well drilling used water insulation duct and method for testing its elastic stability
A technology of elastic stability and water-resistant conduit, which is applied in drilling pipes, drilling equipment, underwater drilling, etc., and can solve the problems of material waste and irrationality
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Embodiment 1
[0084] The invention is used to detect the critical load and stability of a drilling water riser in Bohai Oilfield.
[0085] It is assumed that the opening of the water-resistor 1 is in the drilling moon pool of the drilling platform at this time, and the top is in a fixed state. It is known that the water depth of an oilfield in the Bohai Sea is 25m, and the jack-up drilling platform is used for drilling operations, and the air gap is 10m. The top of the conduit is constrained by the wellhead plate, and the top can be regarded as the hinged end 3, and the bottom of which is 50m into the mud, which can be regarded as the fixed end 2. At this time, the data of the wellbore conduit and surface casing above the drilling wellbore mud hanging are as follows (Table 1 shown):
[0086]
Casing - Steel Grade - #
Outer diameter" / mm
inner diameter" / mm
length
m
Uniform load
kg / m
Remark
30”-X52
30”...
Embodiment 2
[0101] The invention is used to detect the critical load and stability of another drilling water riser in the Bohai Oilfield.
[0102] The water depth of the drilling is 32m, and the remaining field drilling conditions and technical parameters detected and collected are the same as those in Embodiment 1. According to the technical parameters collected during testing, the critical load of the drilling riser of this embodiment is calculated according to formula (23) under the condition of constant stiffness of the conduit, and the results are shown in Table 4.
[0103] Diameter
" / mm
outer diameter
cm
the inside diameter of
cm
critical load
kg / m
l Length
m
critical load
P cr t
String
Self-weight t
tensile safety
Coefficient
30”
76.2
71.12
461.3
42
458.554
39.2
54.8
20”
50.8
47.57
198
42
89.625
16.8
57...
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