Thermal displacement integrated control system and method for long straight gathering and transportation pipelines

Abstract

The invention discloses a thermal displacement integrated control system and method for long straight gathering and transportation pipelines. The system comprises a semi-anchoring system, a thermal expansion and absorption system and a distributed strain detection system, wherein the semi-anchoring system comprises single stage or multiple stages of small anchoring piers, and the anchoring piers comprise concrete structures and anchoring flanges arranged on the concrete structures; the thermal expansion and absorption system comprises a pipeline system formed by welding bent pipes with multiple angles and large curvature radii and connecting straight pipes; the distributed strain detection system comprises a strain gauge mounted on the semi-anchoring system and the thermal expansion and absorption system and a data processing system connected with the strain gauge; one side of the thermal expansion and absorption system is connected with a pipeline inside a station, and the other sideof the thermal expansion and absorption system is connected with the semi-anchoring system; the other side of the semi-anchoring system is connected with a pipeline outside the station; and a weldingconnection mode is adopted. The scheme disclosed by the invention has the advantages that the occupied area is moderate, loads are dispersed, functions are complete, and the effects of facilitating field installation and guaranteeing safety of pipelines and equipment entering and exiting from the station are achieved.

Description

technical field [0001] The invention relates to a thermal displacement comprehensive control system and method of a long straight gathering and transportation pipeline. Background technique [0002] In recent years, with the development of oil and gas gathering and transportation systems tending to high temperature and high pressure, the stress level of steel pipelines has been continuously increased, and corresponding measures must be taken to control pipeline stress. Some oil and gas fields are located on flat terrain, with straight pipelines and good laying conditions. However, when laying a straight pipeline in the ground, it generally exhibits the characteristics of "semi-anchor-anchor-semi-anchor". The two ends of the pipeline have the ability to move within a certain length range, and the degree of deformation is affected by the installation temperature, operating temperature and thermal expansion properties of the pipe. It is called the "active section"; the middle ...

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Problems solved by technology

The above two methods each have certain usage limitations.

When using π-shaped bends, it is necessary to consider the available range of line routing. If a suitable π-shaped bend (for example, limited line routing) cannot bear the displacement load, it is necessary to consider setting up multiple π-shaped bends along the long straight pipeline. Therefore, the installation density is relatively high. If a single π-shaped bend is used to absorb the thermal displacement of the movable section of the long straight pipe, the length of the π-shaped bend arm will be relatively large, and the stress of the bend directly connected to the pipe The horizontal selection is higher than the downstream pipe fittings, which is too concentrated; when anchor piers are installed at both ends of the pipeline, the size of the anchor piers increases with the increase of the axial thrust of the pipeline, and the gathering and transportation pipelines often have high design pressure, large operating-installation temperature difference, The wall thickness is relatively large, so the axial thrust is large, resulting in a huge weight of the anchor pier, high requirements for the foundation, and a huge investment. At the same time, there is a certain risk of settlement, which will cause a hidden danger to the facilities in the station.

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