Metal pipeline defect identification and welding-free maintenance method
A defect identification and welding-free technology, applied to pipes/pipe joints/fittings, pipe components, piping systems, etc., can solve problems such as irreparable pipelines
Active Publication Date: 2017-11-28
PETROCHINA CO LTD +1
View PDF5 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The main purpose of the present invention is to provide a metal pipeline defect identification and welding-free maintenance method to solve the problem in the prior art that the pipeline cannot be repaired due to improper pressure control of the injection sealant
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
no. 5 example
[0243] According to the fifth embodiment of the present invention, a spiral welded steel pipe with a pipe length of 2784m, an operating pressure of 1.8MPa, an outer diameter of 219mm, and a wall thickness of 7mm, and oily sewage treatment pipeline inspection and maintenance are taken as examples, including:
[0244] 1. The location detection of pipeline defects includes the following steps:
[0245] Step 1: Site survey, investigate the basic information of the pipe section, and prepare for the development of the inspection plan. mainly includes:
[0246] 1) History: The pipeline has been in operation for about 5 years, and some pipe sections have been corroded and scaled seriously. There have been several pipe breaks and pipe leaks, and a total of 12 repairs have been made.
[0247] 2) Pipeline layout: layout of tees, flanges and elbows.
[0248] 3) Pipeline specifications: the pipe diameter is Φ219mm, the wall thickness is 7mm, the operating pressure is 1.8Mpa, the entry temperature i...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a metal pipeline defect identification and welding-free maintenance method. The method comprises the steps that a damage data table is established, and a function relationship between damage conditions and safety construction pressure is established in the damage data table; the damage conditions of a pipeline is detected through a detection device, and according to the damage conditions determined after detection is conducted through the detection device, the safety construction pressure of the pipeline is determined by inquiring the damage data table; a matched sealing fixture is selected according to the determined safety construction pressure and damage conditions; the sealing fixture is installed at the damaged portion of the pipeline, and a cavity is formed between the sealing fixture and the outer wall of the pipeline; sealant is injected into the cavity through an injecting device so as to conduct seal maintenance on the damaged portion of the pipeline, and the pressure, generated in the cavity, of the sealant is smaller than the safety construction pressure. By means of the method, the problem that the injected sealant causes secondary damage to the pipeline, and then the pipeline cannot be repaired is effectively solved.
Description
Technical field [0001] The invention relates to the technical field of oilfield pipeline damage and leakage maintenance, in particular to a method for identifying defects in metal pipelines and welding-free maintenance. Background technique [0002] The pipeline maintenance method in the prior art often requires production shutdown for maintenance and replacement, which is difficult and time-consuming to maintain, and once a fire occurs, it is easy to cause safety accidents. Stopping production for maintenance will also bring additional economic losses due to production stagnation. Therefore, in the daily production and operation of the oil field, the pipeline damage caused by the corrosion or scaling of the inner wall of the oil and gas pipelines is often repaired by the immobilized injection-type pressure sealing technology. This technology uses a special sealing fixture to rebuild a new sealing structure on the leaking part to quickly make up for the leakage defect, to preven...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/175F16L55/18F17D5/06
CPCF16L55/175F16L55/18F17D5/06
Inventor 梁爱国王庆林蒋华义王玉龙
Owner PETROCHINA CO LTD