CN2683822Y

CN2683822Y - Super-high pressure double flow passage PDC drill head

Info

Publication number: CN2683822Y
Application number: CN 200420038635
Authority: CN
Inventors: 赵付国; 徐依吉
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2004-02-25
Filing date: 2004-02-25
Publication date: 2005-03-09
Anticipated expiration: 2014-02-25

Abstract

The utility model provides a super-high pressure PDC drill bit with double flow passages. On the basis of an ordinary steel PDC drill bit, under the condition that an ordinary flow passage and an ordinary nozzle exist, the interior of a drill bit is provided with a super-high pressure pipe; the upper end of the super-high pressure pipe is connected to the outlet end of a downhole booster pump, and the lower end is connected with the super-high pressure nozzle of the drill bit through the super-high pressure flow passage arranged in the interior of the drill bit. The super-high pressure drill bit is arranged on the rear of PDC cutting teeth on a cutter wing, conducting the super-high pressure jet current to cut rocks, and helping the cutting teeth to break rocks; the upper part of the drill bit is provided with a correction device through which the super-high pressure pipe is fixed in the cavity of the drill bit; the correction device is also provided with axial flow passages except correction the super-high pressure pipe. An ordinary nozzle can be replaced, the super-high pressure nozzle is arranged in an outer sleeve, and the super-high pressure nozzle can also be replaced.

Description

Super-pressure dual channel PDC drill bit

Technical field:

It is steel body PDC drill bit that the utility model relates to a kind of boring tool.

Background technology:

Superhigh pressure water jet aided drilling technology can increase substantially bit speed.Present employed PDC drill bit great majority are adapted at using in shallow well, the middle-deep well, the work that domestic and international PDC drill produced and research unit do mainly is to improve aspect bit body material, cutting teeth shape and application life, the drill bit cloth tooth, improving the application life and the bit speed of drill bit.But at deep-well particularly in the ultradeep well, because formation drillability is poor, these PDC drill bits have only been considered the waterpower design that borehole pump commonly used is depressed, using in the probing of deep-well ultradeep well can be because the restriction of ground pump pressure, tubing string pressure falls and increases and pressure on the drill bit is fallen reduce, cause the shaft bottom hydraulic energy low, cause bit speed slow, do not reach the rapid drilling purpose.The pressure that begins to utilize the downhole pressure increasing pump to improve drill bit in deep-well, ultradeep well probing falls at present, utilizes the broken rock of the auxiliary PDC cutting teeth of hydraulic energy of high-pressure water jet, improves bit speed.In this case, common PDC drill bit can't be finished this task, therefore is necessary to manufacture and design super-pressure PDC drill bit.

Technology contents:

The purpose of this utility model is the super-pressure PDC drill bit that a kind of dual channel will be provided.

The purpose of this utility model is achieved in that in the inside of steel body PDC drill bit a super high pressure bend is set, the top of super high pressure bend connects downhole pressure increasing delivery side of pump end, the bottom is communicated with the superhigh pressure water jet nozzle by the runner of processing in the drill bit, the super-pressure nozzle is installed in the back of cutting teeth on the wing of steel body PDC drill bit, with the broken rock of superhigh pressure water jet auxiliary cutting element.There is an erection device to set upright super high pressure bend on drill bit top.

Description of drawings:

Fig. 1 is the structural representation of the dual channel super-pressure PDC drill bit that proposed according to the utility model patent.

The specific embodiment:

Describe concrete structure of the present utility model in detail below in conjunction with accompanying drawing.

According to the dual channel super-pressure PDC drill bit that the utility model proposed is based on ordinary steel body PDC drill bit, in bit body 3 inside a super high pressure bend 1 is set, the top of super high pressure bend 1 connects downhole pressure increasing delivery side of pump end, the bottom is communicated with superhigh pressure water jet nozzle 9 by the runner of processing in the bit body, the super-pressure nozzle is installed in the back of cutting teeth on the wing of steel body PDC drill bit, with the broken rock of superhigh pressure water jet auxiliary cutting element.One erection device 2 is housed on drill bit top is used to set upright super high pressure bend 1 at drill bit internal.Erection device 2 is gap type annular springs, and two parts all are cylinders up and down, and the centre is a through hole, has three radial slots on the top of upper cylinder and lower cylindrical body, opens shaft orientation flowing channel on two wall thickness.What link to each other with the drill bit inner chamber by the runner of processing on bit body is interchangeable plain nozzle 5, uses screwed connection between plain nozzle 5 and the bit body, and 4 sealings of " O " RunddichtringO are arranged.Super high pressure bend 1 bottom links to each other with bit body 3 by screw thread, seal by the inclined-plane, join by super-pressure runner and the super-pressure nozzle 9 that processes on the bit body 3 then, super-pressure nozzle 9 is placed in the overcoat 8, there is the cylinder 7 of through hole to communicate by interior, has " O " RunddichtringO 6 to seal between super-pressure nozzle cylinder 7, overcoat 8 and the bit body 3 with the super-pressure runner.

Claims

1. super-pressure dual channel PDC drill bit, based on ordinary steel body PDC drill bit, it is characterized in that under the situation of original common flow passage of PDC drill bit and plain nozzle, in bit body (3) inside a super high pressure bend (1) is set, the upper end of super high pressure bend connects downhole pressure increasing delivery side of pump end, the lower end is connected with super-pressure bit nozzle (9) by the super-pressure runner of processing in bit body (3), and super-pressure drill bit (9) is according to the back of PDC cutting teeth on the wing of steel body PDC drill bit; Bit body (3) top has erection device (2) that super high pressure bend (1) is fixed in the drill bit chamber.

2. super-pressure dual channel PDC drill bit according to claim 1, it is characterized in that erection device (2) is the gap type annular spring, two parts all are cylinders up and down, and the centre is a through hole, have three radial slots on the top of upper cylinder and lower cylindrical body, on two wall thickness, open shaft orientation flowing channel.

3. super-pressure dual channel PDC drill bit according to claim 1 is characterized in that super high pressure bend (1) lower end links to each other with super-pressure runner on the bit body with screw thread, and the upper end links to each other with the underground booster port of export.

4. super-pressure dual channel PDC drill bit according to claim 1, it is characterized in that super-pressure nozzle (9) is installed in the overcoat (8), link to each other with the super-pressure runner of bit body by the cylinder (7) that through hole is arranged, whole overcoat links to each other with bit body by screw thread and is interchangeable.