A kind of solid expansion tube bending expansion test method under load

Abstract

The invention relates to the technical field of solid expansion pipes in the petroleum natural gas industry, in particular to a load based bending and expansion testing method of a solid expansion pipe, and aims at overcoming the defects in the prior art that the expansion pipe under a bending state cannot be subjected to full-size evaluation rest, and the safety and reliability of the expansion pipe body under underground service are low. The method is characterized in that the height of a plurality of v-shaped rolling shafts on a bearing rack is adjusted according to the bending curvature to be achieved; the tested expansion pipe passes through a floating sleeve on the bearing rack, then sequentially passes through the adjusted v-shaped rolling shafts and finally arrive at a fixing pressing plate; the tested expansion pipe is pressed through the fixing pressing plate; an expansion cone is mounted into the tested expansion pipe, and plugs are welded at two ends of the expansion pipe; during performing of an non-axial-load expansion test, hydraulic water is directly poured at one end of each plug with the cone through a high-pressure water pouring pipe so as to push the expansion cones to finish the expansion test process.

Description

technical field [0001] The invention relates to the technical field of solid expansion pipes in the oil and gas industry, in particular to a load-bearing bending expansion test method for solid expansion pipes. Background technique [0002] Solid Expandable Tubular SET (Solid Expandable Tubular) technology is a new drilling, completion and workover technology that radially expands the casing string to the required diameter in the wellbore for the purpose of "saving" the borehole size . The application of this technology can increase the number of casing layers to be lowered, bringing "revolutionary" impact and significant technical and economic benefits to deep wells, drilling and wellbore structures with complex geological conditions. It can make the wellbore "thin" and significantly reduce the development cost. It makes "single diameter" possible. [0003] The solid expansion tube technology has been developed and applied very rapidly all over the world. The solid expan...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a load-bearing bending expansion test method for solid expansion pipes, which is used to overcome the problems caused by the tortuosity of the well wall or the large-arc deflection section of the horizontal well when the prior art is used downhole. It is in a bent state, and it is impossible to conduct a full-scale evaluation test on the expansion tube under this working condition, and it causes hidden dangers to the safety and reliability of the expansion tube during downhole service.

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