Bridge plug for oil-gas well

Abstract

A bridge plug for an oil-gas well comprises an upper part assembly and a lower part assembly. The upper part assembly comprises a central shaft and a cylindrical sleeve disposed outside the central shaft, the upper end of the central shaft is provided with a connector which is in threaded connection to be attached to an operating too,. the cylindrical sleeve accommodates the central shaft, the upper end of the central shaft is provided with a threaded connector, and the central shaft carries a selection tool through the threaded connector; and the lower part assembly is attached to the upper part assembly, the lower part assembly includes a lower mandrel provided with a first end arranged in the lower end of an upper mandrel, the lower mandrel is fixed in a proper place by the upper mandrel, the selection tool, an upper shear pin and a second shear pin, wherein the upper shear pin and the second shear pin set the central shaft . The bridge plug can be taken from a wellbore; the bridgeplug includes a release device that can get back at least part of the bridge plug when disassembling of an entire tool is difficult.

Description

technical field

[0001] The present application relates to a bridge plug, in particular to a removable bridge plug. Background technique

[0002] In the completion of oil and gas wells, there are various downhole operations where it may be necessary to isolate specific areas within the well. Typically, this is accomplished by temporarily plugging the well casing with bridge plugs at one or more given points. Bridge plugs are commonly used to accomplish operations such as isolating a hole in one section of a well from a hole in another section, or isolating the bottom of a well from the wellhead. Conventional bridge plugs simply isolate some parts of the well from another part of the well.

[0003] In some cases, however, bridge plugs are not necessarily used for isolation, but can be used, for example, to create cement plugs in the wellbore. Bridge plugs can be temporary or permanent. If temporary, it must be movable. Bridge plugs may be drillable or retrieveable. Drill...

Examples

Embodiment Construction

[0025] The present application provides a retrievable bridge plug having a plurality of drillable components, preferably made of composite material, so that it can be retrieved, drilled or both removed as desired.

[0026] A bridge plug for oil and gas wells, the bridge plug includes an upper part assembly and a lower part assembly. like figure 1 As shown, the upper part assembly includes a central shaft 101 and a cylindrical sleeve 102 disposed outside the central shaft 101 , the upper end of the central shaft 101 is provided with a connecting piece 103 which is threaded to be attached to an operating tool. A cylindrical sleeve 102 houses a central shaft 101 having a threaded connection 104 at its upper end, through which the central shaft 101 carries a selection tool 112 having a recess 114 at an upper end 113 and a radial port 116 near the lower end. Also included within the selection tool 112 is an upper mandrel 118, and the central shaft 101, selection tool 112 and uppe...

technical field

[0001] The present application relates to a bridge plug, in particular to a removable bridge plug. Background technique

[0002] In the completion of oil and gas wells, there are various downhole operations where it may be necessary to isolate specific areas within the well. Typically, this is accomplished by temporarily plugging the well casing with bridge plugs at one or more given points. Bridge plugs are commonly used to accomplish operations such as isolating a hole in one section of a well from a hole in another section, or isolating the bottom of a well from the wellhead. Conventional bridge plugs simply isolate some parts of the well from another part of the well.

[0003] In some cases, however, bridge plugs are not necessarily used for isolation, but can be used, for example, to create cement plugs in the wellbore. Bridge plugs can be temporary or permanent. If temporary, it must be movable. Bridge plugs may be drillable or retrieveable. Drill...

Examples

Embodiment Construction

[0025] The present application provides a retrievable bridge plug having a plurality of drillable components, preferably made of composite material, so that it can be retrieved, drilled or both removed as desired.

[0026] A bridge plug for oil and gas wells, the bridge plug includes an upper part assembly and a lower part assembly. like figure 1 As shown, the upper part assembly includes a central shaft 101 and a cylindrical sleeve 102 disposed outside the central shaft 101 , the upper end of the central shaft 101 is provided with a connecting piece 103 which is threaded to be attached to an operating tool. A cylindrical sleeve 102 houses a central shaft 101 having a threaded connection 104 at its upper end, through which the central shaft 101 carries a selection tool 112 having a recess 114 at an upper end 113 and a radial port 116 near the lower end. Also included within the selection tool 112 is an upper mandrel 118, and the central shaft 101, selection tool 112 and uppe...

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