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Recoverable whipstock and combined fishing tool thereof

A technique for fishing tools and ramps, which is used in wellbore/well components, drilling equipment and methods, and earth-moving drilling, etc., can solve the problem that the fishing hook cannot hook the ramp, the workload of grinding and milling is large, and it is easy to damage. casing and other problems, to achieve the effect of reliable anchor release, short operation cycle and reliable tool recovery

Active Publication Date: 2015-07-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But there are following problems in the existing retrievable oblique device: one, when the salvage hook is salvaged, it is necessary to determine the salvage position, and it is necessary to try repeatedly, and once the salvage groove is deformed or blocked, the salvage hook cannot hook the oblique device, resulting in the fishing fail
2. When the casing milling barrel is salvaged, the milling workload is heavy, it takes a long time, and it is easy to damage the casing, and the operation risk is high

Method used

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  • Recoverable whipstock and combined fishing tool thereof
  • Recoverable whipstock and combined fishing tool thereof
  • Recoverable whipstock and combined fishing tool thereof

Examples

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Effect test

Embodiment 1

[0033] A retrievable skewer, comprising a main body 1, and an anchor seat 2 providing axial and circumferential anchoring forces, one end of the main body 1 is fixedly connected to the anchor seat 2, and the other end is provided with a guide inclined surface, and penetrates The main body 1 and the anchor seat 2 are provided with a central inner hole, and the central inner hole on the main body 1 is provided with a fishing structure matched with a fishing tool.

[0034] In the present invention, the central inner hole on the main body 1 includes an upper inner hole, a middle inner hole and a lower inner hole. The inner hole of the upper section and the inner hole of the lower section form a stepped structure, and the salvage structure is a stepped structure.

[0035]The utility model relates to a retrievable combined fishing tool for a skewer, which includes a through-drilling spear and a fishing spear, the through-drilling spear is used for cleaning the drilling debris in the...

Embodiment 2

[0046] The present embodiment further describes the present invention in detail as follows:

[0047] In the present invention, the main body of the oblique device provided with the inclined surface is a hollow structure, and the central inner hole is provided with a salvage step, and the combined fishing tool enters the central inner hole, and after cleaning the central inner hole, the oblique device is grasped by the salvage claw to complete Recovery of the complete set of skewers.

[0048] The retrievable skewer is composed of a main body 1 and an anchor seat 2. The main body 1 is a hollow structure, and a fishing step matched with a fishing tool is provided in the central inner hole; the anchor seat 2 provides axial and circumferential anchors for the skewer. Fixed force: After the main body 1 is grasped by the fishing tool, the ground continuously lifts the pipe string, and the anchor seat 2 releases the anchor, and the whole set of inclined devices can be recovered to the...

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Abstract

The invention discloses a recoverable whipstock and a combined fishing tool thereof. The recoverable whipstock comprises a body and an anchoring seat for providing axial and circumferential anchoring force, one end of the body is fixedly connected with the anchoring seat, a guide inclined plane is arranged at the other end of the body, the body and the anchoring seat are penetratingly provided with central inner holes, and a fishing structure matched with the fishing tool is arranged in the central inner hole in the body. The combined fishing tool has the advantages that blockage in the whipstock can be removed effectively; a straightening connector is centered automatically, so that a drilling-through spear and a fishing spear are guaranteed to be aligned accurately, blindness is low and operability is high; and fishing is completed by match among claws of the fishing spear and the whipstock, and accordingly a working cycle is short while success rate is high.

Description

technical field [0001] The invention relates to a branch well operation tool, in particular to a retrievable skewer and a combined fishing tool thereof, belonging to downhole tools. Background technique [0002] In branch well drilling, the fishing of the recoverable skewer is a key part of the operation. At present, there are two kinds of salvage tools commonly used: salvage hook and sleeve milling barrel. For example, Chinese Patent No. "CN200510135261.5" discloses a retrievable skewer and its fishing tool. The disclosure date is June 28, 2006. The retrievable skewer includes a main body, and the main body includes The upper body and the lower body are fixedly connected, and a salvage cup is set at the junction of the upper body and the lower body, and the mouth of the salvage cup faces the upper body. In the salvage groove between the connecting part and the salvage cup, the lower body has a guiding slope, an elastic element is provided above the guiding slope, and a di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/08E21B31/20
Inventor 胡东锋叶文勇魏小房谭欢
Owner BC P INC CHINA NAT PETROLEUM CORP