A kind of universal drilling tool overhauler and its overhauling method

An overshot, general-purpose technology, applied in the fields of drilling and drilling machinery, can solve the problems of low success rate of drilling tools salvage, damage to drilling tools, etc.

Active Publication Date: 2021-04-23
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects and deficiencies in the prior art, the present invention provides a general-purpose drill tool overhauler and its fishing method, which overcomes the problems of low success rate of drilling tool fishing and great damage to the drilling tool in the fishing process under the existing conditions. question

Method used

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  • A kind of universal drilling tool overhauler and its overhauling method
  • A kind of universal drilling tool overhauler and its overhauling method
  • A kind of universal drilling tool overhauler and its overhauling method

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Embodiment 1

[0045] Such as Figure 1 to Figure 7 As shown, this embodiment provides a general-purpose drilling tool overshot, which includes an outer tube 1, and the two ends of the outer tube 1 are respectively provided with a reducing pipe 2 and a sleeve that are coaxial with the outer tube 1 and detachable and fixedly communicated. 3. In the outer tube 1, there are coaxial sleeves from outside to inside: an annular pilot piston 4 capable of axial movement, an inner tube 5 with a water hole 51 on the side wall, and a hollow piston rod 6 capable of axial movement; An end cover 7 is provided at the end of the hollow piston rod 6 and the ring-shaped pilot piston 4, one end of the end cover 7 is close to the end of the reducing pipe 2, and the other end is fixedly connected with the end of the inner tube 5, and the end cover 7 is provided with There is an axial water inlet channel 71; the hollow piston rod 6 extends into the sleeve 3, and the coaxial core rod 8 is connected to the tail of t...

Embodiment 2

[0056] This embodiment provides a kind of salvage method of the general-purpose drilling tool overshot in embodiment 1, and this salvage method comprises the following steps:

[0057] Step 1: Connect the external salvage drill pipe to the variable diameter joint, send the general-purpose drilling tool overshot to the place where the drill tool breaks or falls, and pass high-pressure water into the external salvage drill pipe to the variable diameter joint. Under the action, the annular pilot piston moves to the right, and the first spring compresses the annular pilot piston to move axially until the tapered through hole is aligned with the first annular groove, forming an unlocking groove; the high-pressure water further passes through the water hole, and the high-pressure water Under the action, the hollow piston rod tends to move to the right, and the hemisphere of the limiting bead is squeezed into the unlocking groove. The hollow piston rod and the core rod move to the righ...

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Abstract

The invention discloses a general-purpose drilling tool overhauler and a fishing method thereof, comprising an outer pipe, a variable-diameter connecting pipe and a sleeve; the outer pipe is coaxially sleeved from outside to inside in sequence: an annular pilot piston capable of axial movement, The side wall is provided with an inner pipe with a water hole and a hollow piston rod that can move axially; an end cover with a water inlet channel is provided at the end of the hollow piston rod and the end of the annular pilot piston; the tail of the hollow piston rod is connected with the For the core rod of the shaft, the end of the core rod is an enlarged end, and an elastic claw is arranged on the core rod jacket, and the claw end of the elastic claw is arranged around the enlarged end of the core rod. The invention is used for rapid salvage of accidents such as drill tool breakage or drop during drilling, and fast and reliable connection between the overhauler and the broken drill tool is realized by clamping the inner wall of the drill tool with elastic claws and locking the core rod with the limit bead to avoid Secondary shedding of the drilling tool during fishing; it also has the function of releasing jams. If the situation in the hole is complicated, it can quickly separate the overshot from the broken drilling tool to prevent the accident from worsening and reduce losses.

Description

technical field [0001] The invention belongs to the technical field of drilling and drilling machinery, and in particular relates to a general-purpose overhauler for drilling tools and a fishing method thereof. Background technique [0002] During the drilling construction process, accidents such as drilling tool breakage and falling often occur. Usually, salvage tools such as male cones or female cones are used for salvage treatment. Connect with fishing tools to achieve fishing. The buckle length of the male cone or female cone fishing tool must be determined according to experience, and tripping accidents are prone to occur during the fishing process, and the success rate of fishing is low. If it is unsuccessful once, the drilling tool will be damaged more when salvage is carried out many times, and it will easily cause the situation in the hole to become complicated and cannot be salvaged. For some drilling tools with high hardness, buckles cannot be made on the fractu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/20E21B31/113E21B31/16E21B21/00E21B3/02
CPCE21B3/02E21B21/00E21B31/113E21B31/16E21B31/20
Inventor 陈彦宇田东庄王传留董萌萌周春董昌乐范运林朱宁鄢忠方
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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