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Double-step cutting structure bit

A cutting structure and drill bit technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and mining, etc., can solve the problem of not being able to drill strata containing gravel layers in the middle

Inactive Publication Date: 2006-09-13
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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Problems solved by technology

[0003] In order to overcome the defect that the above-mentioned conventional PDC bit can only be adapted to drilling homogeneous formations with better drillability, but cannot drill formations containing gravel layers in the middle, the present invention provides an oil and gas drilling bit, which can effectively drill through the middle strata containing gravel layers

Method used

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Embodiment Construction

[0009] refer to figure 1 and figure 2 A dual-stage cutting structure drill bit for oil and gas drilling includes a drill body 1 and several cemented carbide cutting pieces 2 , several PDC cutting pieces 3 and several nozzles 4 installed on the end face of the drill body 1 . In the radial direction, the arrangement of the PDC cutting parts 3 adopts the same approximate equal cutting method as most conventional PDC drill bits, while the arrangement of the cemented carbide cutting parts 2 adopts an approximate equal power method. The exposed height of the cemented carbide cutting part 2 is 4.0-5.5mm greater than that of the PDC cutting part 3, the cemented carbide cutting part 2 forms the first-level cutting structure, and the PDC cutting part 3 forms the second-level cutting structure. The arrangement density of cemented carbide cutting parts 2 is relatively small, about 1.5, but it can completely cover the bottom of the well; while the arrangement density of PDC cutting parts...

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Abstract

The invention discloses a two-stage cutting bit for petroleum and natural gas drilling, comprising bit body, hard alloy cutting piece, PDC cutting piece and nozzle, where the exposed height of the hard alloy cutting piece is greater than that of the PDC cutting piece, the hard alloy cutting piece composes the first-stage cutting structure and the PDC cutting piece composes the second-stage cutting structure. The distribution density of the hard alloy cutting piece is lower but it can completely cover well bottom, and the distribution density of the PDC cutting piece is equivalent to that of a routine PDC bit. And the two-stage cutting bit can effective drill in a stratum containing gravel layer.

Description

technical field [0001] The invention relates to an oil and gas drilling bit, in particular, a drilling bit with a double-stage cutting structure, which belongs to the structural improvement of the PDC bit. Background technique [0002] Conventional PDC bits have the advantages of fast drilling speed and long service life in homogeneous formations with good drillability. However, during the drilling process, we often encounter the following sequence of formations: the upper and lower layers are better drillable formations, and a thinner gravel layer with poor drillability is sandwiched in between. If a conventional PDC bit is used for drilling in this formation, generally when the gravel layer is drilled, the hard gravel will have a great impact on the drill bit, causing serious damage to the PDC cutting parts, so that the drill bit loses the ability to cut the formation , thus shortening the service life of the drill bit. Co...

Claims

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Application Information

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IPC IPC(8): E21B10/46
Inventor 王福修
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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