Directional CDE drill bit suitable for hard rock stratum

A drill bit and formation technology, which is applied in the direction of drill bit, drilling equipment, earthwork drilling and production, etc., can solve the problems of difficulty in deflection, poor stability of drill bit, and reduced rock breaking efficiency, so as to achieve good rock breaking ability in hard formation, reduce drilling cost, The effect of improving drilling efficiency

Inactive Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

Due to the characteristics of unconventional oil and gas resources such as deep burial, complex overlying strata, frequent lithology changes, and large differences in physical and mechanical properties, the formation rocks usually have high strength, high hardness, strong abrasiveness, and heterogeneous properties during directional drilling. The use of conventional directional PDC bits to explore and develop unconventional oil and gas resources is poor
[0004] When the conventional directional PDC bit is used to explore and develop unconventional oil and gas resources, the PDC bit cuts the rock with the polycrystalline diamond composite sheet. When drilling in a formation with dense rock cementation and poor drillability, the polycrystalline diamond composite sheet cannot eat into the rock and break the rock. The method is changed from cutting to grinding, the efficiency of rock breaking is reduced, and the life of the drill bit is shortened due to increased wear
In addition, due to the strong drillability and anisotropy of the formation, the stability of the drill bit is poor, the deflection is difficult, and the efficiency of directional drilling is low

Method used

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  • Directional CDE drill bit suitable for hard rock stratum
  • Directional CDE drill bit suitable for hard rock stratum
  • Directional CDE drill bit suitable for hard rock stratum

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Embodiment Construction

[0028] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, and are not exhaustive of all the embodiments. And in the case of no conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.

[0029] The inventor noticed during the invention process that the PDC drill bit uses polycrystalline diamond composite sheets to cut rocks. When drilling into a stratum with dense rock cementation and poor drillability, the polycrystalline diamond composite sheets cannot eat into the rock, and the rock breaking method is changed from cutting. For grinding, the efficiency of rock breaking is reduced, and the life of the drill bit is shortened due to increased w...

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Abstract

The invention provides a directional CDE drill bit suitable for a hard rock stratum. The directional CDE drill bit is characterized by comprising a drill bit base, wherein multiple blades are arrangedon the drill bit base, a plurality of conical CDE cutting teeth are arranged on each blade and are formed by covering polycrystalline diamond with a hard alloy base with a conical upper portion. Thedrill bit can improve the well drilling efficiency, shorten a well drilling cycle and reduce the well drilling cost.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling engineering, in particular to a directional CDE drill bit (conical diamond elements bit, plow cutting drill bit) suitable for hard rock formations. Background technique [0002] In the exploration and development of conventional oil and gas resources, the PDC bit (polycrystalline diamond compact bit) has many advantages such as high drilling efficiency, long bit life, good formation adaptability, and fewer downhole accidents. Workhorse drill. [0003] With the depletion of conventional oil and gas resources, the exploration and development of unconventional oil and gas resources has become a new trend. Due to the characteristics of unconventional oil and gas resources such as deep burial, complex overlying strata, frequent lithological changes, and large differences in physical and mechanical properties, the formation rocks usually have high strength, high hardness, strong abrasivene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/60
CPCE21B10/43E21B10/60
Inventor 刘建华刘卫东王果孙明光藏艳彬张建龙周号博张洪宁陈小峰
Owner CHINA PETROLEUM & CHEM CORP
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