CN210122902U

CN210122902U - Soft stratum drifting and reaming tool

Info

Publication number: CN210122902U
Application number: CN201920167814.2U
Authority: CN
Inventors: 任广兵; 刘春昊; 卜进晓; 党峰君; 刘荣; 何旭; 张建; 王书; 郭麟
Original assignee: Pipe Tool Technical Service Center Of Sinopec Shengli Petroleum Engineering Co Ltd; Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp
Current assignee: Pipe Tool Technical Service Center Of Sinopec Shengli Petroleum Engineering Co Ltd; Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2020-03-03
Anticipated expiration: 2029-01-30

Abstract

The utility model relates to a soft stratum drifting and reaming instrument mainly comprises body, cutting wing, cutting tooth and water hole, wherein: the body extends along the lower end of the cutting wing to form a reducing cone, the lower end of the cone is provided with a guide drill bit, a main channel of the water hole extends downwards to the guide drill bit, and the water hole is bypassed to the lower end of the cutting wing. In the drifting process, the leading end is a three-blade drag bit, so that rock debris can be ground, and a good guiding effect can be achieved. The cutting wings are embedded with gauge protection and alloy teeth, so that the well wall can be trimmed and the well rule can be kept in the rotating process of the tool. The bottom of the convex part of the trimming end body adopts circular arc inner chamfer transition, and granular welding rods are paved and welded, the capacity of cutting and grinding the stratum at the position is poor, the generation of a new well hole can be effectively reduced, and meanwhile, the inner chamfer design can effectively avoid the blockage of the original well hole by rock debris and mud cakes. The root of the arc inner chamfer is provided with a water hole, so that the effects of reducing the pressure of the water hole of the scraper and effectively cleaning the inner chamfer are achieved.

Description

Soft stratum drifting and reaming tool

Technical Field

The utility model relates to an oil, natural gas exploration and development instrument technical field, concretely relates to soft stratum expands draws the processing tool of the condition such as well wall resistance point.

Background

In the process of drilling and well completion, the conditions of hole shrinkage, block dropping and the like of a soft stratum well bore occur occasionally, and the well dredging and hole scribing are needed to be carried out for the purposes of well enlarging and hole scribing and well wall resistance point elimination. At present, an old drill bit is generally adopted for drifting, and due to the fact that the outer diameter of the drill bit is large, the complex situation that drifting and reaming cannot reach the bottom of a well or a new well hole often occurs, the problems that drilling is difficult, an original well hole cannot be found, the difficulty in casing running is large or a casing cannot be run are caused, follow-up operation is difficult, and certain economic loss is caused.

Disclosure of Invention

To the problem that above-mentioned drifting in-process exists, the utility model provides a can be in soft stratum well undergauge, fall soft stratum drifting tool of drifting after the circumstances such as piece, avoid the emergence of trouble in the pit.

The technical scheme of the utility model as follows:

a kind of soft stratum drifting and reaming tool, mainly by the body, cutting wing, cutting tooth and water hole make up, wherein: the body extends along the lower end of the cutting wing to form a reducing cone, the lower end of the cone is provided with a guide drill bit, a main channel of the water hole extends downwards to the guide drill bit, and the water hole is bypassed to the lower end of the cutting wing.

The above scheme further comprises:

the pilot bit is a three-blade drag bit and has an outer diameter smaller than the cutting blades.

The cutting wing is spiral and is provided with a spiral cutting groove.

The cutting teeth comprise cutting teeth arranged in front of the cutting wings and gauge protection teeth arranged on the outer side faces of the cutting wings.

The lower end face of the cutting wing is an arc inner chamfer.

The utility model has the advantages that:

in the drifting process, the guide end is a three-blade drag bit, the outer diameter design is smaller than the trimming end, a certain distance is reserved from the maximum outer diameter of the trimming end body, rock debris can be ground, and a good guiding effect can be achieved. The outer diameter of the trimming end body is 3mm smaller than the size of a well hole, and the gauge protection and the cutting alloy teeth are embedded, so that the well wall can be trimmed and the well hole can be kept regular in the rotating process of the tool. The bottom of the convex part of the trimming end body adopts circular arc inner chamfer transition, and granular welding rods are paved and welded, the capacity of cutting and grinding the stratum at the position is poor, the generation of a new well hole can be effectively reduced, and meanwhile, the inner chamfer design can effectively avoid the blockage of the original well hole by rock debris and mud cakes. The root of the arc inner chamfer is provided with a water hole, so that the effects of reducing the pressure of the water hole of the scraper and effectively cleaning the inner chamfer are achieved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention; fig. 2 is a sectional view of fig. 1.

Detailed Description

Example 1:

a kind of soft stratum drifting and reaming tool, mainly by the body 1, cutting wing, cutting tooth and water hole 5 make up, wherein: the body 1 extends along the lower end of the cutting wing to form a reducing cone, the lower end of the cone is provided with a guide drill bit, a main channel of the water hole 5 extends downwards to the guide drill bit, and the water hole is bypassed to the lower end of the cutting wing.

Example 2:

a soft stratum drifting and reaming tool comprises a leading end and a trimming end. The leading end adopts a three-blade drag bit 6, the outer diameter is smaller than that of the trimming end, and the three-blade drag bit has the functions of guiding and grinding rock debris; the size of a convex part (namely a cutting wing) of the trimming end body is 3mm smaller than that of a well hole, a spiral cutting groove is milled, a spiral cutting tooth 3 is welded in front of the cutting groove to cut the stratum, and a spiral gauge protection tooth 2 is embedded in a pre-drilled alloy hole, so that the outer diameter of a tool is kept basically unchanged during rotary cutting, and rock debris can be timely discharged from a spiral groove. The spiral cutting grooves are in spiral curves and are uniformly distributed on the body. And the bottom of the convex part of the trimming end body adopts an arc inner chamfer 4 for transition, and granular welding rods are paved and welded. A water hole is designed on the trimming end body.

Example 3:

as shown in fig. 1/2, the soft formation drifting and reaming tool mainly comprises a body 1, a spiral gauge tooth 2, a spiral cutting tooth 3, an arc inner chamfer 4, a water hole 5 and a three-blade bit 6.

A spiral cutting groove is milled on a convex part (namely a cutting wing) of a body 1, a spiral cutting tooth 3 is welded in front of the cutting groove, a spiral gauge protection tooth 2 is embedded in a pre-drilled alloy hole, an arc inner chamfer 4 is processed at the bottom end of the convex part of the body 1, a granular welding rod is paved, a water hole 5 is arranged on the body 1, a three-wing drill 6 is paved and welded with hard alloy, and the outer diameter is smaller than that of the body 1. In the drifting process, mud is down pumped in from the water hole 5, and 4 water holes of chamfer department are up returned in three wing bit 6 and the circular arc, wash shaft bottom and the wall of a well, and up returned through the pit shaft annular space, the instrument is rotatory simultaneously, and the spiral cutting tooth 3 can be rotatory in the cutting wall of a well again, and simultaneously, spiral gauge tooth 2 can carry out the gauge protection effect in the rotatory cutting process again, and three wing bit 6 mainly play the guide effect in rotatory to the broken detritus of cutting stratum.

Claims

1. The utility model provides a soft stratum drifting and reaming tool, mainly by body, cutting wing, cutting tooth and water hole constitution, its characterized in that: the body extends along the lower end of the cutting wing to form a reducing cone, the lower end of the cone is provided with a guide drill bit, a main channel of the water hole extends downwards to the guide drill bit, and the water hole is bypassed to the lower end of the cutting wing.

2. The soft formation drifting and reaming tool of claim 1, wherein: the pilot bit is a three-blade drag bit and has an outer diameter smaller than the cutting blades.

3. A soft formation drifting tool according to claim 1 or 2, characterized in that: the cutting wing is spiral and is provided with a spiral cutting groove.

4. A soft formation drifting and reaming tool according to claim 3, characterized in that: the cutting teeth comprise cutting teeth arranged in front of the cutting wings and gauge protection teeth arranged on the outer side faces of the cutting wings.

5. The soft formation drifting and reaming tool of claim 4, wherein: the lower end face of the cutting wing is an arc inner chamfer.