CN2292894Y

CN2292894Y - Split double-core PDC drilling bit

Info

Publication number: CN2292894Y
Application number: CN 96250760
Authority: CN
Inventors: 王福修
Original assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Current assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Priority date: 1996-12-23
Filing date: 1996-12-23
Publication date: 1998-09-30
Anticipated expiration: 2006-12-23

Abstract

The utility model belongs to the structure improvement of a double-core PDC drilling bit which is used for oilfield well drilling and geological well drilling. A hole conducting body and a hole enlarging body are separated to be manufactured, and are connected into a whole double-core PDC drilling bit by screw threads. The process is easy, and the manufacturing cost is low. The utility model is used for the well drilling.

Description

A kind of split type diplocardia PDC drill bit

The utility model belongs to the architecture advances of oil, geological drilling usefulness diplocardia PDC drill bit.

Deepen in the drillng operation at old casing inward sidetracking or to old well, adopt diplocardia PDC drill bit can get out a well, create favorable conditions for improving cementing quality greater than itself latus rectum.Adopt the mobile salt deposit of diplocardia PDC bit drills, can reduce lock of tool drilling and take place.

The diplocardia PDC drill bit that uses is integral type at present.This structure has following defective: 1. because diplocardia PDC drill bit has eccentric geometry, the more conventional PDC drill bit of length is big 1～1.5 times, so processing difficulties, the manufacturing cost height.2. if leading body or reaming hole body wherein a part damage in advance, then drill bit just can not re-use, waste seriously.

The purpose of this utility model provides a kind of easy to process, diplocardia PDC drill bit that fabricating cost is low.Diplocardia PDC bit size is long, whole processing difficulties, manufacturing cost height.The utility model is a split-type structural, and leading body and reaming hole body separate machined have shortened Workpiece length, with screw thread leading body and reaming hole body is connected into a whole diplocardia P DC drill bit, thereby has made things convenient for processing.In use, if leading body or reaming hole body are when wherein a part is damaged in advance, the utility model can carry out its replacing easily, has saved the drill bit fabricating cost.

A kind of split type diplocardia PDC drill bit mainly is made up of leading body, reaming hole body and PDC cutting teeth.The leading body upper end is processed with screw thread, and reaming hole body lower end is processed with screw thread, and leading body and reaming hole body couple together by helicitic texture.

Because the utility model had both had the function of the diplocardia PDC drill bit of present use, have again easy to process, fabricating cost is low, leading body and reaming hole body are changed advantage easily, thereby use the utility model drilling well, not only can get out well greater than itself latus rectum, for improving the generation that cementing quality creates favorable conditions or reduces lock of tool drilling when boring mobile salt deposit, and economic benefit is also very remarkable.

Figure of description:

Fig. 1. a kind of split type diplocardia PDC drill bit structure schematic diagram

Description of drawings:

1. leading body 2. reaming hole bodies 3. helicitic texture 4.PDC cutting teeths

Now the utility model will be further described in conjunction with Figure of description:

In drilling process, at first the utility model and other down-hole equipment are coupled together, at the bottom of the lower going-into-well, turn on pump circulating fluid pressurization rotary drilling then.Because leading body of the present utility model [1] can play the centering effect, reaming hole body [2] has eccentric geometry, can play the reaming hole effect, thereby in the rotary drilling process, can get out a well that latus rectum more own is big, increase the annular clearance between the sleeve pipe and the borehole wall, create favorable conditions for improving cementing quality.In like manner, bore mobile salt deposit, because the borehole diameter that gets out is bigger, so can reduce the generation of lock of tool drilling with the utility model.Because leading body of the present utility model [1] and reaming hole body [2] are divided into independently two bodies and process, leading body [1] upper end and reaming hole body [2] lower end all are processed with screw thread, leading body that processes [1] and reaming hole body [2] connect into a whole diplocardia PDC drill bit by helicitic texture [3], so just greatly facilitate processing.In drilling process, leading body or the wherein part generation damage in advance of reaming hole body often appear in diplocardia PDC drill bit, and the situation that whole drill bit is scrapped, the utility model is owing to be split-type structural, leading body [1] and reaming hole body [2] couple together by helicitic texture [3], thereby can change damaged leading body [1] or reaming hole body [2] easily, reduced waste, the drill bit manufacturing cost is descended significantly.

Claims

1. split type diplocardia PDC drill bit, mainly form by leading body [1], reaming hole body [2] and PDC cutting teeth [4], it is characterized in that leading body [1] upper end is processed with screw thread, reaming hole body [2] lower end is processed with screw thread, and leading body [1] couples together by helicitic texture [3] with reaming hole body [2].