Metal pipeline defect identification and welding-free maintenance method
A defect identification and welding-free technology, applied in the direction of pipes/pipe joints/fittings, pipe components, piping systems, etc., can solve problems such as irreparable pipelines
Active Publication Date: 2019-05-07
PETROCHINA CO LTD +1
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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
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no. 5 example
[0243] According to the fifth embodiment of the present invention, taking 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, the detection and maintenance of oily sewage treatment pipelines are taken as an example, including:
[0244] 1. Locate and detect pipeline defects, including the following steps:
[0245] Step 1: On-site survey, investigate the basic situation information of the pipe section, and prepare for the formulation of the testing plan. mainly includes:
[0246] 1) History: The pipeline has been in operation for about 5 years, and some pipe sections have serious corrosion and scaling. There have been several pipe breaks and pipe leaks, and a total of 12 repairs have been made.
[0247] 2) Pipeline layout: the layout of tees, flanges and elbows.
[0248] 3) Pipeline specifications: the pipe diameter is Φ219mm, the wall thickness is 7mm, the operating pressure is 1.8Mp...
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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 metal pipeline defect identification and welding-free maintenance method. Background technique [0002] The pipeline maintenance method in the prior art often needs to stop production for maintenance and replacement, the maintenance is difficult and time-consuming, and once a fire is fired, it is easy to cause a safety accident. Suspended maintenance will also bring additional economic losses due to production stagnation. Therefore, in the daily production and operation of oil fields, pipeline damage caused by corrosion or scaling on the inner wall of oil and gas pipelines is often repaired by non-fired injection-type pressurized sealing technology. This technology uses a special sealing fixture to rebuild a new sealing structure on the leaking part, quickly make up for the leakage defect, prevent the medium from leaking out, and achiev...
Claims
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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