A plugging device and plugging method for oil and gas pipeline reverse well drilling deviated wells

Abstract

The invention discloses a plugging device for back-drilling and deviated wells of oil and gas pipelines. The device includes a tray in an inverted convex shape, which includes an upper half cylinder and a lower half cylinder connected to each other; a stiffening plate is arranged on the outer bottom of the upper half cylinder. Between the end and the outer side of the lower half cylinder, there are several stiffening plates; the permanent support structure is set between the tray and the tunnel rock wall, and is located below the upper half cylinder; the inlet end of the drainage pipe is connected to the bottom of the upper half cylinder, and the outlet The end is connected with the drainage ditch in the tunnel. Also disclosed is a method for plugging deviated wells of oil and gas pipelines, the method includes: setting the tray on the outside of the pipeline so that the tray tightly hugs the pipeline, and then fixing the tray with bolt connectors; inserting the drain pipe in the In the reserved hole at the bottom of the upper semi-cylinder; the gap between the outside of the tray and the raise drilling wall is tightly sealed with filler; concrete is poured between the tray and the tunnel rock wall to form a permanent support structure.

Description

technical field [0001] The invention relates to the technical field of oil and gas transportation, in particular to a plugging device and a plugging method for oil and gas pipeline back-drilling deviated wells. Background technique [0002] In 2014, in the natural gas pipeline project of Saipan Company in Mexico, for the first time, combined with remote sensing data and motion reconstruction technology, it implemented the non-excavation crossing of the CHINIPAS slope with a raise drilling rig. The inclined roadway is about 138m long and the horizontal tunnel is about 100m. succeeded. It not only avoids a large number of earthworks and supporting structures, reduces the risk of slope instability, but also achieves the goal of minimizing the impact on the environment. This project is the first application of foreign raising well technology on pipelines. There is no design and construction precedent in China for laying pipelines through non-excavation by raising drilling tech...

AI Technical Summary

Problems solved by technology

[0003] For back-well drilling projects in coal and other industries, the usual plugging disc has no lower support, and only the bolts on both sides hold the pipe tightly to overcome the self-weight of the upper grouting fluid. As a result, the plugging disc must have a hoop to ensure the length and rigidity of the pipe. Inevitably, the entire blocking device has a large dead weight, is relatively heavy, has poor economy, and is difficult to construct and install.

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