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PDC bit for petroleum and natural gas drilling

A technology of oil and gas and drill bits, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc. It can solve problems such as poor results, and achieve the effect of increasing the compression area and high ROP

Inactive Publication Date: 2006-04-26
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect that the above-mentioned PDC drill bit can only be adapted to drilling homogeneous softer formations, but the effect is not good when drilling soft and hard heterogeneous formations, the present invention provides a PDC drill bit for oil and gas drilling, which can drill in soft and hard formations. Drill efficiently in staggered formations

Method used

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  • PDC bit for petroleum and natural gas drilling
  • PDC bit for petroleum and natural gas drilling

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Embodiment Construction

[0010] refer to figure 1 and figure 2 A PDC drill bit used for oil and gas drilling includes a drill body 1 on which three main blades 3 , three secondary blades 5 and three nozzles 6 are installed. The main blade 3 and the secondary blade 5 are spaced apart from each other in the peripheral direction of the drill bit. All the large-diameter PDC cutting parts 2 are fixed on each main blade 3, the thickness of the large-diameter PDC cutting parts 2 is 8 mm, and the back rake angle α 2 10°, exposure height H 2 is 9mm. All the small-diameter PDC cutting pieces 4 are fixed on the secondary blade 5, the thickness of the small-diameter PDC cutting pieces 4 is 13 mm, and the back rake angle α 1 20°, exposure height H 1 is 5mm.

[0011] When the PDC bit manufactured according to the above scheme is drilled in a soft-hard stratum, or even in a stratum containing conglomerate, due to the exposed height H of the large-diameter PDC cutting piece 2 2 Greater than the exposed height...

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Abstract

The invention discloses an oil-natural gas drilling PDC drill bit, which comprises the following parts: drill body, main knife-wing, second knife-wing, big diameter PDC cutting part, small diameter PDC cutting part and nozzle, wherein the main knife-wing and second knife-wing appear in pairs and interseparate upwards on the drill; big diameter PDC cutting part is fixed on the main knife-wing and small diameter PDC cutting part is fixed on the second knife-wing; the thickness and back inclination angle of big diameter PDC cutting part are less than the small diameter PDC cutting part's; the outcropping height of big diameter PDC cutting part is higher than small diameter PDC cutting part's. The structure can drill in the alternative hard-and-soft formation effectively.

Description

technical field [0001] The invention relates to an oil and gas drilling bit, in particular to a PDC bit. Background technique [0002] A disclosed drill bit for oil and gas drilling is a two-stage cutting PDC drill bit disclosed in Chinese patent ZL 98222404.4, which includes a drill body, a large-diameter PDC cutting piece, a small-diameter PDC cutting piece and a nozzle. The arrangement density of the large-diameter PDC cutting pieces is very small, but it can completely cover the bottom of the well, and the total coverage factor of the large-diameter and small-diameter PDC cutting pieces is equivalent to that of conventional PDC bits. The exposure height of the large-diameter PDC cutting piece is greater than that of the small-diameter PDC cutting piece, the large-diameter PDC cutting piece forms the first-level cutting, and the small-diameter PDC cutting piece forms the second-level cutting. [0003] When the above-mentioned PDC bit drills a homo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/00E21B10/46E21B10/60
Inventor 王福修于建宾田京燕张崇砚
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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