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Redressing-while-drilling machine for drilling engineering and redressing method

A technology of drilling engineering and reamer, which is applied in the direction of drilling equipment and methods, drilling equipment, drill bits, etc., and can solve problems such as casing running and electrical measurement resistance, formation instability, and borehole size reduction, etc., to achieve Eliminate complications, improve drilling safety, and improve regularity

Inactive Publication Date: 2018-09-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many complex formations in the Beibu Gulf Basin in the western part of the South China Sea. During the drilling process, the formations are unstable. The wellbore is easy to neck down and the size of the wellbore becomes smaller. Prone to complex situations such as lost circulation and collapse
During the operation of exploration wells and development wells in the early stage, there were many situations where tripping, casing running, and electrical testing encountered resistance and jamming. A large set of sand-mudstone interbeds in the section requires multiple well drilling, which seriously affects the drilling efficiency

Method used

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  • Redressing-while-drilling machine for drilling engineering and redressing method
  • Redressing-while-drilling machine for drilling engineering and redressing method

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Embodiment Construction

[0016] like figure 1 , 2 As shown, the present invention is a reamer while drilling for drilling engineering, which includes a cylindrical body 1 and a helical blade 2, and three blades 2 are arranged and fixed on the cylindrical body 1 evenly.

[0017] Wherein, the blade 2 includes a blade body 21, a PDC composite sheet cutting tooth 22 and a gauge flat lying tooth 23, and 13-17 PDC composite sheet cutting teeth are evenly distributed on the surface of each blade body 21 22. The gauge flat lying teeth 23 are evenly distributed on the gauge part of the blade body 21 .

[0018] In this embodiment, the cutting edge value of the cutting teeth of the above-mentioned PDC composite sheet is 13.7-14.6%. The above cylindrical body 1 is integrally formed, with an outer diameter of 125-128 mm and an inner diameter of 75-78 mm.

[0019] The present invention also discloses a reamer-while-drilling method for drilling engineering, using the above-mentioned reamer-while-drilling device f...

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Abstract

The invention discloses a redressing-while-drilling machine for drilling engineering. The redressing-while-drilling machine for drilling engineering comprises a cylinder body and three spiral-shaped blade wings, the three blade wings are evenly fixed to the cylinder body. The blade wings comprise blade wing bodies, PDC clad sheet cutting teeth and gauge protection flat teeth. Every blade wing bodies is evenly provided with 13-17 PDC clad sheet cutting teeth, and the gauge protection portions of the blade wing bodies are evenly provided with the gauge protection flat teeth. The redressing-while-drilling machine for drilling engineering is simple in structure, redressing while drilling is performed by using the redressing-while-drilling machine, the well wall can be cleaned and scraped whiledrilling, so that the well wall can be corrected, the redressing effect is improved, hole shrinkage is eliminated and a mould bed is cleaned, and the size of a hole diameter is ensured. The redressing machine can change the flow field of drilling fluid in a well, rotational flow upwards going of the drilling fluid and rock debris is facilitated, and the sand-carrying capacity of the drilling fluid is improved.

Description

technical field [0001] The invention relates to the technical field of downhole tools for drilling engineering, in particular to a reamer while drilling and a reaming method for drilling engineering. Background technique [0002] There are many complex formations in the Beibu Gulf Basin in the western part of the South China Sea. During the drilling process, the formations are unstable. The wellbore is easy to neck down and the size of the wellbore becomes smaller. It is prone to complicated situations such as lost circulation and collapse. During the operation of exploration wells and development wells in the early stage, there were many situations where tripping, casing running, and electrical testing encountered resistance and jamming. A large set of sand-shale interbeds appeared in the section, and multiple well drillings were required in the follow-up, which seriously affected the drilling efficiency. Contents of the invention [0003] The object of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/26E21B10/43E21B7/28
CPCE21B10/26E21B7/28E21B10/43
Inventor 徐一龙曹峰于志刚贾辉穆永威刘智勤杨玉豪郑浩鹏徐超余意黄凯文韦龙贵吴志明刘和兴熊永卫
Owner CHINA NAT OFFSHORE OIL CORP
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