CN106764427A - Oil and Gas Pipeline Partial Maintenance Treatment Process - Google Patents

Abstract

The oil and gas pipeline local maintenance treatment process comprises an oil and gas pipeline, pilot valves arranged on a pipe section where a live working point is located on the oil and gas pipeline, and three groups of pilot valves arranged on two sides of the live working point on the oil and gas pipeline in a distributed manner, wherein the three groups of pilot valves take the live working point as the center and are respectively a first pilot valve a, a first pilot valve a-1, a second pilot valve b-1, a third pilot valve c and a third pilot valve c-1; the water-sealing fire-driving operation maintenance is carried out aiming at the local damage of a longer oil-gas pipeline, so that the whole pipeline is prevented from being processed, and time and labor are saved; the local water sealing process has the working condition of fire, saves the cost and has little influence on the production and operation of the device; the process treatment difficulty is small.

Description

Oil and Gas Pipeline Partial Maintenance Treatment Process

technical field

The invention relates to a local maintenance and treatment process for oil and gas pipelines, which is suitable for the process treatment of damage to long-distance oil and gas pipelines.

Background technique

The oil and gas pipelines put into operation were partially damaged, requiring electric welding and hot fire repairs. For hot maintenance of existing oil and gas pipelines, it is necessary to isolate the entire pipeline at the position with valves and then carry out process treatment. If the pipeline system is relatively long and there is no isolation valve on the pipeline, the entire pipeline needs to be isolated for only one maintenance point on the pipeline. Carry out technological treatment, so operation, expense is too high. In addition, if the production operation is affected, the entire pipeline cannot be processed, and the hot maintenance conditions cannot be met, posing a safety hazard.

Contents of the invention

In order to make up for the above-mentioned technical defects, the purpose of the present invention is to provide a local maintenance treatment process for oil and gas pipelines, which can realize the partial establishment of water seals in the pipelines, meet the hot working conditions, save costs, and have little impact on the production and operation of the equipment.

In order to achieve the above purpose, the technical solution adopted in the present invention is: the local maintenance and treatment process of the oil and gas pipeline, including the oil and gas pipeline, the drain valve installed on the pipeline section where the hot work point is located on the oil and gas pipeline, and the hot work point set on the oil and gas pipeline. There are three sets of drain valves arranged on both sides, and the three sets of drain valves are respectively the first drain valve a, the first drain valve a-1, and the second drain valve b with the hot work point as the center. , the second drenching valve b-1, the third drenching valve c, the third drenching valve c-1;

The oil and gas pipeline is an integral pipe section composed of several U-shaped pipe sections;

The three sets of deluge valves are arranged at the lower end of the U-shaped pipe section distributed on both sides of the pipeline with the hot work point as the center;

The three sets of shower valves and the U-shaped pipe sections where the three sets of shower valves are located are in a one-to-one correspondence with the U-shaped pipe section where the hot work point is located.

The specific repair process is as follows:

After the oil and gas pipeline has been treated by the water top line, the three sets of U-shaped pipe sections on both sides centered on the hot operation point pass through the drain valve to drain the water in the pipeline; the second set of U-shaped pipe sections on both sides of the hot work point The pipe section establishes a water seal, and water is added through the shower valve; then steam is supplied through the first set of U-shaped pipe section shower valves on both sides centered on the hot work point, and the U-shaped pipe section at the hot work point is exhausted through the shower valve , and then cook this section of the pipeline. After the gas sample is qualified for analysis, it is qualified for hot work and can be used for partial hot maintenance.

The beneficial effects of the present invention are: for the local damage of the long oil and gas pipeline, the water seal and hot work maintenance is carried out, avoiding the whole pipeline treatment, saving time and labor; The impact on production operation is small; the difficulty of process treatment is small.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure, 1. Oil and gas pipeline, 2. Deluge valve, 3. U-shaped pipe section, 4. First deluge valve a, 5, First deluge valve a-1, 6, Second deluge valve b, 7 , Second drench valve b-1, 8, third drench valve c, 9, third drench valve c-1, 10, hot work point.

detailed description

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

Example

In July 2016, a company’s wharf to public works mixed benzene material transfer line was 2 kilometers long, and a hidden danger of cracks in the weld of an elbow was found in the middle part. This method was used to establish a water seal process for local pipelines. For this elbow Carry out hot work to replace the elbow with a new one.

The whole set of oil and gas pipelines includes: oil and gas pipeline 1, deluge valve 2 arranged on the pipe section where the hot operation point 10 is located on the oil and gas pipeline 1, and three sets of drench valves arranged on both sides of the hot operation point on the oil and gas pipeline. The three groups of deluge valves centered on the hot work point 10 are the first deluge valve a (4), the first deluge valve a-1 (5), the second deluge valve b (6), the second Drain valve b-1 (7), third drench valve c (8), third drench valve c-1 (9);

The oil and gas pipeline 1 is an integral pipe section composed of several U-shaped pipe sections 3;

The three sets of deluge valves are arranged at the lower end of the U-shaped pipe section 3 distributed on both sides of the pipeline with the hot work point 10 as the center;

The three sets of shower valves and the U-shaped pipe sections 3 where the three sets of shower valves are located are in a one-to-one correspondence with the U-shaped pipe section where the hot work point 10 is located.

The specific repair process is as follows:

After the oil and gas pipeline 1 has been treated by the water top line, the three sets of U-shaped pipe sections on both sides centered on the hot operation point 10 pass through the drain valve 2 to drain the water in the pipeline; Two sets of U-shaped pipe sections 3 establish water seals, add water through the second drench valve b (6) and second drench valve b-1 (7); The first decoy valve a (4) and the first decoy valve a-1 (5) of the U-shaped pipe section supply steam, and the U-shaped pipe section 3 at the hot fire operation point 10 exhausts through the decoy valve 2, and then cooks this For a section of the pipeline, after the gas sample is taken and analyzed to pass the analysis, it is qualified for hot work, and local hot repair work can be carried out.

Claims (5)

1. oil-gas pipeline modular repair handling process, it is characterised in that including oil-gas pipeline, be arranged on oil-gas pipeline work of getting angry The showering guilding valve of industry point place pipeline section, three groups of showering guilding valves for being arranged on fire operation point arranged on both sides distribution on oil-gas pipeline, it is described Three groups of showering guilding valves the first showering guilding valve a, the first showering guilding valve a-1, the second showering guilding valve b, the are respectively centered on fire operation point Two showering guilding valve b-1, the 3rd showering guilding valve c, the 3rd showering guilding valve c-1.

2. oil-gas pipeline modular repair handling process according to claim 1, it is characterised in that described oil-gas pipeline is The overall pipeline section of some U-tube section shape compositions.

3. oil-gas pipeline modular repair handling process according to claim 1, it is characterised in that three groups of described showering guilding valves The lower end of the U-tube section of the both sides distribution centered on fire operation point is arranged on pipeline.

4. oil-gas pipeline modular repair handling process according to claim 3, it is characterised in that three groups of described showering guilding valves And each U-tube section where three groups of showering guilding valves is in one-to-one relationship with U-tube section where fire operation point.

5. oil-gas pipeline modular repair handling process, it is characterised in that：Oil-gas pipeline by water top line treatment after, with fire operation Three groups of U-tubes section of both sides passes through showering guilding valve centered on point, by water emptying in pipeline；Both sides centered on fire operation point Two groups of U-tube sections set up water seal, are added water by showering guilding valve；Again by first group of the both sides U-tube section centered on fire operation point To steam, U-tube section where at the fire operation point is vented showering guilding valve by showering guilding valve, and then this depot siding of boiling, takes gas After sample analysis is qualified, possess fire operation condition, local maintenance activity of getting angry can be carried out.