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Micro-coring PDC bit

A drill and coring technology, applied in construction and other directions, can solve the problem of small size of cuttings

Active Publication Date: 2012-03-07
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional PDC bit has the problem that the size of the drilled cuttings is small, which cannot meet the geological requirements for identification of rock information. Therefore, in order to obtain cuttings that meet the geological requirements, sometimes they have to be used in hard formations. Roller bit

Method used

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Experimental program
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Embodiment Construction

[0009] refer to figure 1 and figure 2 The micro-coring PDC drill bit is mainly composed of drill base 1, blade 2, PDC cutter 3, nozzle 4, flow channel 5, large flow channel 9 and chip flute 6, the nozzle 4 is installed on the drill base 1, and the blade 2 is fixed on the base body 1 of the drill bit, and the PDC cutting teeth 3 are arranged on the blade 2; no PDC cutting teeth are arranged in the center area of ​​the drill bit; the center area of ​​the base body 1 of the drill bit has a groove 7 that allows the micro core 10 formed when the drill bit is drilled to enter , one side of the groove 7 is an inclined plane 8, and the large flow channel 9 smoothly connected with the groove 7 is deeper than the other flow channels 5, and the circumferential dimension of the large flow channel 9 is increased with the increase of the radial dimension of the drill bit. Large and enlarged, the inclined plane 8 faces the large flow channel 9; the width of the flute 6 in the radial direct...

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Abstract

The invention discloses a micro-coring PDC bit, which is mainly formed by a bit basal body, a blade, PDC cutting teeth, a spray nozzle, runners and a debris discharging groove, wherein the spray nozzle is installed on the bit basal body, the blade is fixed on the bit basal body and the PDC cutting teeth are arranged on the blade. The PDC cutting teeth are not arranged in the central area of the bit. A groove which allows micro-core formed during bit drilling to enter is arranged in the central area of the bit basal body. A large runner smoothly connected with the groove into a whole body is deeper than other runners. Moreover, the circumferential dimension of the large runner is increased with the increase of the radial dimension of the bit. The width of the debris discharging groove in the radial direction of the bit is larger than the diameter of the micro-core. Since the micro-core and other common rock debris are discharged to the ground together, the micro-core much larger than common rock debris can be obtained on the ground and can be used by geologists for rock identification.

Description

technical field [0001] The invention relates to an oil and gas drilling bit, in particular to a micro-coring PDC bit, which belongs to the structural improvement of the PDC bit. Background technique [0002] In the case of hard formations, the roller cone bit is generally not used, because the drilling speed of the roller cone bit is slow and the life is short, which often leads to additional tripping operations, increasing drilling time and operating costs. Therefore, a PDC drill bit with a faster mechanical drilling speed is usually used to increase the drilling speed. However, the conventional PDC bit has the problem that the size of the drilled cuttings is small, which cannot meet the geological requirements for identification of rock information. Therefore, in order to obtain cuttings that meet the geological requirements, sometimes they have to be used in hard formations. Roller bit. Contents of the invention [0003] The technical problem to be solved by the prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/55
Inventor 王福修于建宾田京燕邱巍王明瑞
Owner 中石化石油工程技术服务有限公司