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Drainage type fixture and method for plugging bimetal composite pipe piercement under pressure by utilizing drainage type fixture

A bimetallic composite pipe, plugging technology under pressure, applied in the direction of pipe elements, piping systems, pipes/pipe joints/pipe fittings, etc., can solve the problem of only stopping and changing pipes, etc., and achieves the effect of simple operation.

Inactive Publication Date: 2020-06-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming that the failure of the current bimetallic composite pipe can only be stopped and replaced for emergency repair, and to provide a drainage fixture and a method for using it to plug leakage of the bimetallic composite pipe under pressure

Method used

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  • Drainage type fixture and method for plugging bimetal composite pipe piercement under pressure by utilizing drainage type fixture
  • Drainage type fixture and method for plugging bimetal composite pipe piercement under pressure by utilizing drainage type fixture
  • Drainage type fixture and method for plugging bimetal composite pipe piercement under pressure by utilizing drainage type fixture

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Embodiment

[0069] The pipeline is a 316L bimetal composite pipe, which is composed of a base pipe 1 and a liner 2, wherein the base pipe 1 is L245 steel, the liner 2 is stainless steel, the outer diameter of the pipe is 508mm, and the wall thickness is 14mm; the conveying medium 3 is Crude oil, the pressure is 10MPa; the diameter of the notch on the outer wall of the base pipe 1 is about 3mm.

[0070] see Figure 4 , Figure 4 It is a schematic diagram of the split fixture in Example 1. The material of the drainage fixture is 16Mn, and the first shell 8 and the second shell 9 are connected through the side shaft 18 to form a movable part that can be snapped open and closed; the first shell The length of the body 8 and the second shell 9 is 500mm, and the thickness is 18mm; the inner diameter of the filling section 6 of the first shell and the second shell is 508mm, the depth of the shallow groove 7 is 5mm, and the front and rear edges of the shallow groove 7 The distance to both ends o...

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Abstract

The invention discloses a drainage type fixture and a method for plugging bimetal composite pipe piercement under pressure by utilizing the drainage type fixture, and belongs to the field of petroleumpipelines. The method for plugging bimetal composite pipe piercement under pressure by utilizing the drainage type fixture comprises the following steps of (1) installing the drainage type fixture onthe periphery of a bimetal composite pipe, wherein a resin injection hole is located above a leakage point; and (2) injecting resin into the resin injection hole, wherein the resin enters an annularcavity between the bimetal composite pipe and the drainage type fixture through the resin injection hole so as to fill a corrosion or collapse part caused by piercement on the bimetal composite pipe.The resin is filled in the cavity formed by the drainage type fixture and the outer wall of the pipeline, and penetrates through a piercement hole so as to fill an inner erosion pit and a collapse cavity, so that a plugging effect is achieved; and the drainage type fixture is simple to operate, solves the problem that suspend production, evacuation and pipe replacement are needed, and accomplishesthe plugging of the leakage point caused by bimetal composite pipe piercement under the condition that a flowing medium still exists in the pipeline.

Description

technical field [0001] The invention belongs to the field of oil pipelines, in particular to a draining fixture and a method for using the same to puncture leakage of a bimetallic composite pipe under pressure. Background technique [0002] At present, 316L bimetallic composite pipes are widely used in oil fields. The seamless stainless steel liner and the outer base pipe are strongly embedded together by spinning composite technology, which has a certain protective effect on internal corrosion. However, due to the poor strength and corrosion resistance of the butt girth weld of the bimetallic composite pipe liner, local corrosion perforation and leakage often occur at the girth weld. , the phenomenon that the conveying medium passes through the liner and contacts the base pipe, corroding the base pipe. In addition, due to the thin thickness and low rigidity of the liner, the liner collapse often occurs during operation. [0003] Due to the structure of the bimetallic comp...

Claims

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Application Information

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IPC IPC(8): F16L55/172F17D5/02
CPCF16L55/172F17D5/02
Inventor 马卫锋聂海亮刘冠军王珂曹俊任俊杰蔡克莫子雄罗金恒赵新伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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