Righting casing attaching and blocking pipe

Abstract

The invention discloses a righting casing attaching and blocking pipe. A pipe body is internally provided with a through hole, a flat-body-type external thread is machined on the upper part of the pipe body, a flat-body-type internal thread is machined on the lower part of the pipe body, the buckle type and the structure size of the flat-body-type external thread and the flat-body-type internal thread are same, placement grooves are formed in the outer part of the pipe body in a machined mode, the 3-8 placement grooves are evenly distributed on the outer wall of the pipe body, the placement grooves are divided into upper groove segments, middle groove segments and lower groove segments, the middle groove segments are dovetail types, the width of outer openings of the middle groove segmentsis less than the width of righting strips, grooves are formed in the upper part of the righting strips, the righting strips are mounted in the placement grooves, the upper parts of the righting strips are located in the upper groove segments, one segments of the righting strips are located in the middle groove segments, the righting strips are provided with outer convex segments, the outer convexsegments of the righting strips are arched and are located below the middle groove segments, the lower parts of the righting strips are located in the placement grooves, and the outer convex segmentscan deform and contract into the lower groove segments when the outer convex segments are under the action of external force.

Description

technical field [0001] The invention is equipment for oil production and workover, and is a kind of straightening casing sticking plugging pipe. Background technique [0002] The oil and water well casing in oil development will be damaged after a long time of use, resulting in leakage, making it impossible to produce oil or inject water normally. When this happens, the casing must be plugged. Casing plugging means that the next section of the plugging pipe is pasted to the damaged part of the casing, and then the adhesive (cement) is poured into the gap between the plugging pipe and the casing to fix the plugging pipe and the casing into one, and It can keep the seal, and this technique of repairing the casing is called casing plugging in the field. Since the damaged section of the casing is generally very long, the plugging tubes required are also very long. Multiple plugging tubes need to be connected with threads to be lowered into the casing. In order to ensure that th...

AI Technical Summary

Problems solved by technology

Therefore, the wall thickness of the plugging pipe is relatively thin, and the existing centralizing mechanism cannot be installed on the plugging pipe, so that the plugging pipe cannot be located in the middle of the casing when it is lowered in the casing, resulting in an annular gap between the plugging pipe and the casing. The space is not uniform, so that the poured adhesive (cement) is uneven, which greatly affects the quality of the casing plugging, resulting in a short validity period after the casing plugging, or failing to meet the repair requirements

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