Flexible pipe assisted type pipeline returning method

A kind of pipeline back towing, auxiliary technology, applied in the direction of pipeline laying and maintenance, pipe/pipe joints/pipe fittings, mechanical equipment, etc. Achieve the effect of reducing ground uplift or formation fracturing, increasing flow channels, and reducing circulation pressure

Inactive Publication Date: 2012-05-02
WUHAN DEAWON TRENCHLESS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking a steel pipe with a diameter of 1219mm and a wall thickness of 22mm as an example, the buoyancy of the mud on the pipe after entering the borehole is more than twice the weight of the pipe. The huge buoyancy will make the pipe tightly pressed against the upper wall of the borehole, greatly Increased resistance and risk in the pullback process
[0004] In addition, in the process of closed dragging back, the mud will be discharged from the annulus between the borehole and the pipeline for a long period of time, and

Method used

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  • Flexible pipe assisted type pipeline returning method
  • Flexible pipe assisted type pipeline returning method
  • Flexible pipe assisted type pipeline returning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: The hose-assisted pipeline pull-back method of the present invention is different from the conventional closed pull-back method; according to the characteristics of the pipeline pull-back process, the present invention changes the conventional closed puller into an open puller 2, for To prevent the mud from entering the pipeline from fouling the inside of the pipeline, a hose 8 with matching specifications is introduced inside the pipeline 1 to isolate the incoming mud 6 from the inner wall of the pipeline. The construction process of the hose-assisted pipeline pullback method of the present invention is as follows: figure 1 , 2 , 3 shown.

[0031] The hose-assisted pipeline dragging method of the present invention, the specific operation is implemented according to the following steps:

[0032] (1) After the welding of the pipeline 1 is completed, the hose 8 is pulled into the pipeline through the traction steel rope, and tightly assembled with the pipe...

Embodiment 2

[0037] Embodiment 2: In the hose-assisted pipeline dragging method of the present invention, the hose used can be a single-layer hose 16, and the single-layer hose can be made of a high-strength water-proof material 13. Make the joint edge 14 on the side, install three longitudinal ribs 15 on the outside of the high-strength water-proof material 13, roll up the high-strength water-proof material 13 processed with the longitudinal rib 15 and the joint edge 14 longitudinally, Make single-layer hose 16 on the mould, its structure and manufacturing process are as Figure 4 As shown, the single-layer hose 16 has the characteristics of high tensile strength, watertightness, and wear resistance.

Embodiment 3

[0038] Embodiment 3: In the hose-assisted pipeline dragging method of the present invention, the hose used usually needs to be made of a composite hose 21 by physical combination of more than one high-strength wear-resistant material. Its structure and manufacturing process are as follows Figure 5 As shown, the pipe material of the composite hose 21 can be made of high-strength wear-resistant material A17, water-proof material 18 and high-strength wear-resistant material B19, and the composite material 20 is processed by painting adhesive materials between the two materials. The two sides of the composite material 20 are made with joint edges 14, and seven longitudinal ribs 15 are installed on the composite material along the longitudinal direction, and the materials are combined along the joint edges 14 to form a composite hose.

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Abstract

The invention relates to a flexible pipe assisted type pipeline returning method. A high-intensity water isolation flexible pipe matched with a pipeline is placed in the pipeline; the flexible pipe and the pipeline are tightly installed employing an arc-shaped pressing plate and fastening bolts on the inner side of the inlet end of the pipeline; slurries in a drill hole enter in the flexible pipethrough a slurry channel of an open type pipe drawing device when the pipeline is returned; after the pipeline is returned, the slurries in the flexible pipe are pumped off from two ends of the pipeline by two submersible pumps; and the flexible pipe is taken out to finish the pipeline returning operation. The method provided by the invention can reduce slurry buoyancy acting on the pipeline whenthe pipeline is returned so as to improve stress state of the pipeline in a pipeline returning process; meanwhile, the method can improve pressure state and flow state of the slurries in the drill hole in the pipeline returning process so as to lower the risk of the pipeline returning process. The method provided by the invention is simple to operate and has the advantages of time saving, safe construction, wide application range and the like.

Description

technical field [0001] The invention relates to a hose-assisted pipeline pullback method, in particular to a method that can be used for horizontal directional drilling without causing contamination to the inner wall of the pipeline during the pullback process of the pipeline, and can avoid the occurrence of excessive buoyancy of the pipeline during pullback. The open-type hose-assisted pipeline back-drag technology, which floats up and presses the upper wall of the borehole to prevent the drastic increase of the annular mud pressure and reduce the risk of back-drag, belongs to the field of geological engineering. Background technique [0002] In horizontal directional drilling engineering, due to the cleanliness and integrity of the pipeline, when horizontal directional drilling is used to pull back the pipeline, a closed pullback device is usually used to tightly connect the pipeline or the inlet end of the pipeline is sealed by other means to prevent During pullback, the ...

Claims

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Application Information

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IPC IPC(8): F16L1/028F16L1/06
Inventor 孔耀祖
Owner WUHAN DEAWON TRENCHLESS TECH
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