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Novel while-drilling under-reamer

A reamer and casing technology, applied in drilling equipment and methods, drilling equipment, earthwork drilling and production, etc., can solve the problems of low reliability, high cost, complex reamer structure, etc., and achieve simplified matching methods, The effect of solving the complex structure and simplifying the overall structure

Pending Publication Date: 2017-12-15
深圳市远东石油钻采工程有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new type of drilling-while-drilling reamer for the lower part of the casing aiming at solving the problem of complex structure, low reliability and high cost of the reamer in the prior art. question

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] With the complexity of the wellbore structure, many special operations in the drilling process require reaming of the lower part of the casing, which requires the use of a variable diameter reamer, that is, after the reamer passes through the casing shoe with a small diameter, Entering the formation below the pipe shoe, it can be changed to a large diameter. When the pilot bit drills a new wellbore, the reamer will expand the borehole diameter in time. This is the working process of what we call the "new reamer while drilling for the lower part of the casing". .

[0023] figure ...

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Abstract

The invention discloses a novel while-drilling under-reamer. The novel while-drilling under-reamer comprises a piston, a reset spring, a driving shaft and a plurality of dovetail groove cutting blocks and windows, wherein the piston, the reset spring, the driving shaft and the dovetail groove cutting blocks are arranged in a shell body; the windows corresponding to the dovetail groove cutting blocks penetrate through the shell body; a spring is compressed by the piston, and the driving shaft is pushed to descend. According to the novel while-drilling under-reamer, the dovetail groove cutting blocks move in the radial direction, the reaming work is completed and the matching mode of a cutter and the piston is simplified at the same time, design of parts such as a sealing sleeve, a spring supporting sleeve and a supporting shaft ring is omitted, and the whole structure of the novel while-drilling under-reamer is simplified, the problem that a reaming device is complicated in structure, poor in reliability and high in cost in the prior art is effectively solved.

Description

technical field [0001] The invention relates to the technical field of deep-water drilling equipment, in particular to a novel drill-while-drilling reamer for the lower part of casing. Background technique [0002] A variety of tools with deployable knives are used in the oil and gas detection and production industries, including undercasing reamers, also known as under-reamers. In the past drilling process, the diameter of the lower wellbore must be smaller than the inner diameter of the upper casing. This conventional drilling procedure will bring great inconvenience to the smooth running and completion of the corresponding casing. With the increase in the number of complex wells such as ultra-deep wells, highly deviated wells, and extended-reach multi-bottom wells, especially the development of marine deepwater drilling, the wellbore structure is becoming more and more complex, and the casing sequence is increasing. The gap between the casing and the drilled hole is gett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/28
CPCE21B7/28
Inventor 贾银鸽张燕张武辇
Owner 深圳市远东石油钻采工程有限公司
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