Double-wall annular salvaging sleeve pipe and method for salvaging falling objects in hole

Abstract

The invention provides a double-wall annular salvaging sleeve pipe, which comprises an inner pipe, an outer pipe, a circular chassis and an anchoring agent cartridge, wherein the inner pipe and the outer pipe are concentrically arranged; bottom parts of the inner pipe and the outer pipe are respectively fixed on the chassis; the anchoring agent cartridge is located in an annular space between the inner pipe and the outer pipe and is fixed on the chassis; and the width of the annular space between the inner pipe and the outer pipe is larger than a wall thickness of an object to be salvaged. The invention also provides a method for salvaging falling objects in a hole. The method comprises the following steps of: (1) screwing a salvaging sleeve pipe in the hole, and enabling a breakage drill to be salvaged to enter into the annular space between the inner pipe and the outer pipe of the salvaging sleeve pipe; (2) breaking the anchoring agent cartridge by utilizing relative rotation between the breakage drill and the salvaging sleeve pipe, and adhering the breakage drill through anchoring agent, wherein the coagulation time of the anchoring agent is at least 4 hours; and (3) screwing the salvaging sleeve pipe adhered with the breakage drill out of the hole. The double-wall annular salvaging sleeve pipe is adopted, so that two sets or more breakage drills in the hole can be salvaged efficiently and smoothly.

Description

technical field [0001] The invention relates to an oil fishing tool and a fishing method, in particular to a double-wall annular fishing casing and a method for falling objects in a fishing hole. Background technique [0002] In the process of oil extraction, due to the influence of geological changes, drilling trajectory, drilling tool material, equipment failure, human operation and other factors, in-hole accidents are inevitable. Fish falling is one of the common in-hole accidents. The so-called fallen fish refer to those falling in the well that hinder the normal drilling and must be removed or salvaged before the normal drilling can be resumed. A tool that specializes in fishing fish (also known as falling objects). For example, a sharp cone can be used to make a catch on the inner hole wall of a falling object with a hole. That is, when the sharp cone enters the falling object After the inner hole of the hole, add appropriate drilling pressure to force the salvage th...

AI Technical Summary

Problems solved by technology

However, when the hole depth exceeds 300 meters, the success rate of accident handling is relatively low; and, secondary accidents may occur due to various reasons during the casing milling process, for example, the casing milling drill breaks in the stuck directional drilling tool and In the annular space between the borehole wall, that is to say, when two sets of accident drilling tools fall into the borehole, the accident in the hole is complicated

[0004] In the case of two sets of accident drilling tools, if the above-mentioned conventional button making and fishing tools (such as pointed cone or box cone) are used to make buttons, because the fractured casing milling tools may also contain the original fractured directional drill As a result, it has become unfeasible to fish broken casing milling tools with pointed cones

In addition, because the female cone itself has a certain wall thickness, it is difficult to insert the female cone in the annular gap between the broken casing milling tool and the hole wall, that is, it is difficult to insert the female cone on the outer wall of the casing milling tool. Therefore, it is also difficult to use the female cone to make buckles and salvage the broken casing milling drill

In addition, when using a sharp cone or a female cone for fishing, it is necessary to ensure that the broken drilling tool in the hole is fixed during the buckle making, so that the thread on the sharp cone or female cone can be threaded into the head of the fallen fish (that is, The top of the falling fish), otherwise, when the sharp cone or the female cone rotates to make a button, it will drive the accidental drilling tool to rotate at the same time, and the purpose of making a button cannot be achieved

Especially when above-mentioned accident occurred in the borehole of hundreds of meters depth, owing to can't stop the accident drilling tool in the hole to rotate simultaneously, therefore, above-mentioned accident drilling tool all becomes the dead drill that adopts conventional method to be unable to handle, and can only at last Eliminate expensive directional drilling tools in the hole

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