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Full-hydraulic reamer

An eye reamer and full hydraulic technology, which is applied in drilling equipment, earthwork drilling, drill bits, etc., can solve the problems that it is difficult to fully meet the needs of drilling engineering and the structure of the reamer is not perfect, so as to improve the working life and reliability , the effect of improving adaptability

Active Publication Date: 2012-12-12
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

[0006] To sum up, the structure of the existing reamer itself is still not perfect enough to fully meet the needs of drilling engineering. It is still necessary to improve the design according to actual needs and explore a more reasonable structural form

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Taking a fully hydraulic eye reamer as an example, the present invention will be further described in detail.

[0035] refer to figure 1 . The full hydraulic eye reamer is mainly composed of a housing 1, a mandrel, a cylindrical pin 7, a reamer blade 8, a sealing limit ring 11, a shear pin 12, a mandrel seat 16, and a lower joint 17. It is characterized in that: The inner cavity of the cylindrical shell 1 has a mandrel;

[0036] The mandrel is mainly composed of the mandrel piston 2, the mandrel nipple 10, the mandrel cap 14, the main nozzle 15 and the main nozzle gland 13. The mandrel piston 2 has a central hole, the outer wall of the mandrel piston 2 is a stepped cylinder, the outer wall of the upper end of the mandrel piston 2 is cylindrical, and the outer wall of the upper end of the mandrel piston 2 is slidingly fitted with the center hole of the upper end of the housing 1; 2 There are two semicircular arc-shaped annular grooves on the outer wall ...

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Abstract

The invention relates to a full-hydraulic reamer applied to the fields of drilling and reaming operation for oil and gas exploration and development. A stepped cylinder is arranged on the outer wall of a mandrel piston, the lower end of the mandrel piston is in threaded connection with a mandrel nipple, an annular sealed limit ring is arranged in an annular space between the mandrel nipple and the shell, a mandrel cap is sleeved on an outer wall at the lower end of the mandrel nipple, a main nozzle and a main nozzle gland are fixed in a stepped central hole in the mandrel cap, a bypass hole is arranged on the wall of the mandrel cap, a lower joint is fixed at the lower end of the shell, a mandrel seat is fixed at the upper end of the lower joint, three rectangular windows are uniformly distributed on the shell wall along the circumferential direction, rectangular reaming cutter wings are arranged in each rectangular window through a cylindrical pin, and an incomplete gear is arranged at the inner end of each reaming cutter wing and engaged with a rack on a normal triangular prism in the middle of the mandrel piston. After a drill string is rotated to increase the pump displacementand open the cutter wings, reaming can be started, after the reaming is finished, the reaming cutter wings are withdrawn after a ball is placed, and drilling is normally continued after the reaming is finished, therefore drilling time is saved.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a special tool for downhole reaming, in particular to a hydraulic reamer for reaming operations. Background technique [0002] Reaming is the process of enlarging a wellbore in situ to a larger diameter hole while drilling. In the past 20-30 years, as oil and gas drilling has shifted to deep wells, ultra-deep wells, high-pressure oil and gas wells, marine deep-water drilling and other fields, drilling engineering has to face more and more complicated situations. As an important means to deal with abnormal drilling conditions, hole reaming technology has been continuously developed, and has gradually become a superior technology that can deal with easily collapsed and leaky formations, realize small gap cementing, and reduce drilling costs. [0003] Common reamers used in reaming operations can generally be divided into two types: fixed-wing reamers and movable-wing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/32
Inventor 马汝涛尹洪伟韩飞贾涛朱英杰王雪刘洋耿莉郭慧娟纪友哲
Owner BC P INC CHINA NAT PETROLEUM CORP
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