CN104060945A - Inner sleeve pipe for riser pipe - Google Patents

Abstract

The present invention relates to an inner casing used for a water riser, which comprises an inner casing body and several shaped steels arranged at intervals along the axial direction on the outer wall of the inner casing body; each shaped steel consists of several It is composed of profiled steels that are fastened and connected to the outer wall of the inner sleeve body and distributed in a circular array. The invention welds six profiled steels in a circular array along the outer wall of the inner sleeve body, the profiled steels form a surface contact with the outer casing or the inner wall of the outermost water-resisting conduit with uniform load distribution, and utilize the spoke effect of the profiled steels to effectively strengthen the barrier The rigidity and bending resistance of the water conduit combination can improve the ability of the riser combination to withstand ice loads, and greatly enhance the anti-icing stability of the riser combination without increasing the operating procedures and working time. The section steel itself has superior section moment of inertia characteristics, fundamentally improves the section moment of inertia of the riser, and its bending resistance is also greatly improved.

Description

A kind of inner casing for water riser

technical field

The invention relates to an inner casing, in particular to an inner casing for a riser.

Background technique

In the process of offshore oil exploration and development, the riser is one of the most important components, and it plays a very important role in establishing the drilling channel and supporting the wellhead equipment. The commonly used riser can only realize the establishment of the channel and support the wellhead equipment. function, and its bending resistance depends on the material, diameter and wall thickness of the riser itself, so the strength between the riser and the inner layers of casing is limited, and the overall bending resistance and ice resistance of the combination are also limited. Not guaranteed.

Contents of the invention

In view of the above problems, the object of the present invention is to provide an inner sleeve for a riser that can improve the bending resistance and ice resistance of the riser.

In order to achieve the above object, the present invention adopts the following technical solutions: an inner casing for a water riser, which is characterized in that it includes an inner casing body, and several axially spaced ones arranged on the outer wall of the inner casing body Each of the steel components is composed of a number of steel components fastened to the outer wall of the inner sleeve body and distributed in a circular array.

The section steel is composed of six I-beams, and the two wings of each I-beam are arc-shaped.

Each of the I-beams is firmly connected with the outer wall of the inner sleeve body by welding.

The length of each said I-beam is 7m-16m.

Above sea level, the axial interval of each I-beam combination is 3m-8m; below sea level, the axial interval of each I-beam combination is 4m-8m.

Due to the adoption of the above technical scheme, the present invention has the following advantages: Since the present invention welds six I-beams in a circumferential array along the outer wall of the inner casing body, the inner casing is coaxially inserted in the outer casing or the outermost water-proof In the conduit, the I-shaped steel forms surface contact with the outer casing or the inner wall of the outermost water-resisting conduit with uniform load distribution. The spoke effect of the steel can effectively enhance the stiffness and bending resistance of the riser combination, thereby improving the ability of the riser combination to withstand ice loads, and greatly enhancing the strength of the riser combination without increasing the operating procedures and working time. Ice stability. In addition, because the I-beam itself has superior section moment of inertia characteristics, the section moment of inertia of the riser is fundamentally improved, and its bending resistance is also greatly improved.

Description of drawings

Fig. 1 is a schematic front view of the overall structure of the present invention

Fig. 2 is a schematic top view of the overall structure of the present invention

Fig. 3 is a three-dimensional schematic diagram of the overall structure of the present invention

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 3, the present invention includes a cylindrical inner sleeve body 1, and the outer wall of the inner sleeve body 1 is fastened and connected with six I-beams 20 in a circumferential array to form an I-beam composition. 2. The two wing plates 200 and 201 of the I-beam are arc-shaped to ensure that each I-beam 20 is completely attached to the outer wall of the inner casing body 1 and the inner wall of the outer casing 3 or the outermost water-resisting conduit 4 combine.

On the axial direction of the outer wall of the inner sleeve body 1, a number of I-beams are arranged at equal intervals to form 2, and the present invention is coaxially fitted with the outer sleeve 3 or the outermost water-resisting conduit 4.

In the above embodiments, each I-beam 20 is firmly connected with the inner sleeve body 1 by welding.

In the above embodiment, the length of each I-beam 20 is 7m-16m.

In the above embodiment, above the sea level, the interval of each group of I-steel combinations 2 is 3m-8m; below the sea level, the interval of each group of I-steel assemblies 2 is 4m-8m.

The above-mentioned embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component can be changed to some extent, and any equivalent transformation and improvement carried out on the basis of the technical solution of the present invention should not excluded from the protection scope of the present invention.

Claims (6)

1. An inner casing for a water riser, characterized in that it comprises an inner casing body, and several shaped steels arranged at intervals along the axial direction on the outer wall of the inner casing body; each shaped steel The composition consists of a number of section steels that are fastened and connected to the outer wall of the inner sleeve body and distributed in a circular array. 2. An inner casing for a water riser as claimed in claim 1, wherein the section steel is composed of six I-beams, each of which is composed of six I-beams. The two wing plates are arc-shaped. 3 . The inner casing for a water riser according to claim 2 , wherein each of the I-beams is fastened to the outer wall of the inner casing body by welding. 4 . 4. An inner casing for a water riser as claimed in claim 2 or 3, wherein the length of each said I-beam is 7m-16m. 5. An inner casing for a water riser as claimed in claim 2 or 3, characterized in that, above sea level, the axial interval of each combination of I-beams is 3m to 8m; Hereinafter, the axial distance between each of the I-beam components is 4m-8m. 6. An inner casing for a water riser as claimed in claim 4, characterized in that, above sea level, the axial interval of each said I-beam combination is 3m-8m; below sea level, The axial distance between each of the I-beam components is 4m-8m.