CN205243424U - Seven wing drill bits suitable for basal conglomerate creeps into - Google Patents

Abstract

The utility model discloses a seven wing drill bits suitable for basal conglomerate creeps into belongs to oil drilling instrument field, and drill bit base member (1) surface is equipped with seven wing (2), be equipped with a plurality of PDC cutting teeths on wing (2), the PDC cutting teeth includes plane PDC cutting teeth (3) and sphere PDC cutting teeth (4), the clearance department of adjacent wing (2) is equipped with chip groove (6), being equipped with a plurality of nozzles (5) on chip groove (6), can solving that the conventional PDC drill bit of application creeps into in the present basal conglomerate stratum, the cutting teeth collapses and decreases seriously, and the life weak point can not drill through the basal conglomerate stratum, roller bit creeps into inefficiency, short class of technical problem of live time.

Description

A seven-knife wing drill bit suitable for bottom conglomerate drilling

technical field

The utility model relates to the field of oil drilling tools, in particular to a seven-blade drill bit suitable for bottom conglomerate drilling.

Background technique

There are large sections of bottom conglomerate formations in the Guantao Formation in all blocks in the northern Bohai Sea of my country. When conventional PDC bits are used to drill in bottom conglomerate formations, the cutting teeth are prone to chipping and loss due to large impact loads. Cutting ability, resulting in the low footage of the drill bit and cannot effectively drill through the conglomerate section. At present, from the perspective of on-site drilling conditions, when drilling in the bottom conglomerate formation, frequent drilling and replacement of the roller cone bit for drilling seriously affects the drilling cycle; moreover, the drilling efficiency of the roller cone bit is low and the wear resistance is poor. The drilling efficiency is low and the drilling time is long. Ocean drilling operations are expensive, so improving the performance of PDC drill bits is of great significance for saving drilling costs.

Contents of the invention

The purpose of this utility model is: to overcome the above-mentioned problems in the prior art, and to propose a seven-blade drill bit suitable for bottom conglomerate drilling, which can solve the problem of conventional PDC drill bit drilling in the bottom conglomerate stratum. The collapse is serious, the service life is short, and the bottom conglomerate formation cannot be drilled; the drilling efficiency of the roller cone bit is low, and the service time is short and other technical problems.

The purpose of the utility model is achieved through the following technical solutions: a seven-blade drill bit suitable for bottom conglomerate drilling, the surface of the drill bit base is provided with seven blades, and the blades are provided with a number of PDC cutting teeth, The PDC cutting teeth include the front row of plane PDC cutting teeth and the rear row of spherical PDC cutting teeth. The rear row of spherical PDC teeth has high impact resistance, which can improve the performance of the drill bit in the bottom conglomerate formation with small gravel diameter, low content and loose cementation. The service life of the blades, the gap between the adjacent blades is provided with chip removal grooves, and a number of nozzles are arranged on the chip removal grooves.

The utility model relates to a seven-blade drill bit suitable for bottom conglomerate drilling. The front row of the blades is arranged with planar PDC cutting teeth, and the rear row is arranged with spherical PDC cutting teeth.

The utility model relates to a seven-blade drill bit suitable for bottom conglomerate drilling. The rear row of spherical PDC cutting teeth and the front row of plane PDC cutting teeth are arranged on the same track.

The utility model relates to a seven-blade drill bit suitable for bottom conglomerate drilling. The rear row of spherical PDC cutting teeth are distributed on at least three blades.

The utility model relates to a seven-blade drill bit suitable for bottom conglomerate drilling, the rear row of spherical PDC cutting teeth is 0.5-2mm lower than the front row of plane PDC cutting teeth.

A seven-knife wing drill bit suitable for bottom conglomerate drilling according to the utility model, the back rake angle of the front row of plane PDC cutting teeth is 20-25 degrees, and the back rake angle of the rear row of spherical PDC cutting teeth is 15-20 degrees. Spend.

The utility model relates to a seven-blade drill bit suitable for bottom conglomerate drilling. The diameter of the plane PDC teeth is 19 mm, the diameter of the spherical PDC teeth is 19 mm, and the radius SR of the spherical surface is 22-30 mm.

According to the above-mentioned technical scheme, the beneficial effect of the utility model is: to overcome the above-mentioned problems existing in the prior art, and to propose a seven-knife-wing drill bit suitable for bottom conglomerate drilling, which can solve the problem of small gravel diameter, low content, cementation, etc. The conventional PDC bit is used to drill in the loose bottom conglomerate formation, the cutting teeth are seriously damaged, and the service life is short, so it cannot drill through the bottom conglomerate formation; the drilling efficiency of the roller cone bit is low, and the service time is short and other technical problems.

Description of drawings

Fig. 1 is a structural representation of a novel hybrid drill bit suitable for bottom conglomerate drilling of the utility model;

Figure 2 is a partial schematic diagram of a spherical PDC;

Marked in the figure:

1-drill base, 2-blade, 3-plane PDC, 4-spherical PDC, 5-nozzle, 6-flutes.

detailed description

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further described.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Example 1

For bottom conglomerate formations with small gravel diameter, low content, and loose cementation, the front row of main cutters adopts a planar PDC3 arrangement, and the rear row adopts a spherical PDC4 arrangement on the same track as the front row of teeth. The front row of BLD1 to BLD7 is arranged on the plane PDC3, which is arranged on the blade 2 in a backward tilting manner. The range of the backward tilt angle is 20 degrees to 25 degrees. The front row is 2.0mm lower.

Due to the adoption of the above-mentioned technical scheme, the beneficial effect of the utility model is: to overcome the above-mentioned problems in the prior art, and propose a seven-knife wing drill bit suitable for bottom conglomerate drilling, which can solve the problem of small gravel diameter, low content, The conventional PDC bit is used to drill in the loosely cemented bottom conglomerate formation, the cutting teeth are seriously damaged, and the service life is short, so it cannot drill through the bottom conglomerate formation; the drilling efficiency of the roller cone bit is low, and the service time is short and other technical problems.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A seven-blade drill bit suitable for bottom conglomerate drilling, characterized in that seven blades (2) are arranged on the surface of the drill bit base (1), and several PDC cutting blades (2) are provided on the blade (2) Teeth, the PDC cutting teeth include the front row of plane PDC cutting teeth (3) and the rear row of spherical PDC cutting teeth (4), and the gap between the adjacent blades (2) is provided with chip removal grooves (6), so Several nozzles (5) are arranged on the flutes (6). 2. A seven-blade drill bit suitable for bottom conglomerate drilling according to claim 1, characterized in that: the front row of the blade (2) is a plane PDC cutter (3), and the rear row is Spherical PDC cutters (4). 3. A seven-blade drill bit suitable for bottom conglomerate drilling according to claim 2, characterized in that: the rear spherical PDC (4) and the front flat PDC (3) are arranged on the same track. 4. A seven-blade drill bit suitable for bottom conglomerate drilling according to claim 2, characterized in that: the rear spherical PDC (4) is distributed on at least three blades. 5. A seven-blade drill bit suitable for bottom conglomerate drilling according to claim 2, characterized in that: the cutting edge height of the rear row of cutters is 0.5-2mm lower than that of the front row of cutters. 6. A seven-blade drill bit suitable for bottom conglomerate drilling according to claim 2, characterized in that: the back rake angle of the front row of plane PDC cutters (3) is 20-25 degrees, and the rear row of spherical surfaces The back rake angle of the PDC cutter (4) is 15-20 degrees. 7. A seven-blade drill bit suitable for bottom conglomerate drilling according to any one of claims 1-6, characterized in that: the diameter of the plane PDC cutter (3) is 19 mm, and the spherical surface The diameter of the PDC cutter (4) is 19 mm, and the spherical radius SR is 22-30 mm.