RU2700330C1 - Stabilizing two-level drill bit for core sampling - Google Patents

Abstract

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to well drilling and can be used for core sampling. Stabilizing two-tier bit includes a shank, a lower drilling and top drilling with stabilizers of the tier, which consist of a row of symmetrically arranged cutting blades including radially arranged cutting elements. Lower tier of the bit is represented with detachable drilling head reinforced with PDC. Drill head and upper drill string are connected with possibility of joint rotation in one direction. Drill head is configured to take core. Inside the stabilizing two-tier bit there is a core pipe. Bit is made with possibility of connection with core set. Technical result is achieved by placing a detachable drilling head in the lower tier of the bit for the purpose of core sampling at simultaneous drilling of the well of the specified diameter.

EFFECT: wider range of applicability, higher mechanical drilling speed and longer life of the bit.

1 cl, 2 dwg

Description

The development relates to the field of drilling wells with cutting bits and can be used in the mining and oil and gas industries for drilling wells for various purposes. The cutting-type two-tier chisel is designed for drilling with a downhole motor in rocks above average and strong.

Known multi-tier chisel cutting type (see patent for invention of the Russian Federation No. 2310732. Multi-tiered chisel cutting type / Tretyak A.Ya., Chikhotkin V.F., Litkevich Yu.F., Aseeva A.E. Application 2006100565/03 (000634) dated January 16, 2006; publ. November 20, 2007; Bull. No. 32), designed for drilling wells for various purposes in rocks of the VI-VIII category for drillability.

It is also known stabilizing two-tier chisel cutting type, adopted by us for the prototype (RF patent No. 2445433).

The disadvantage is that if necessary (meeting productive formations during the drilling of the wellbore), it is impossible to take a core.

The objective of the invention is to improve the known bit, giving it an additional function (core sampling). This task is accomplished by replacing the drilling string of the known stabilizing bunk bit of the cutting type with a removable drill head reinforced with PDC (diamond carbide plate).

The invention is illustrated in FIG. 1., where the stabilizing two-tier chisel is presented. For core sampling, a core tube is located above the bit.

A stabilizing bit for coring is used only in intervals of coring along the wellbore, by replacing the lower drilling tier with a drill head (Fig. 2) intended for coring.

The proposed bit is cost-effective, as it allows you to:

- to carry out coreless drilling with a high stabilizing effect, that is, the degree of verticality will be quite high;

- to take a core at predetermined intervals along the wellbore by replacing the drill string with a drill head and incorporating a core pipe into the shell;

- after coring with any core receiving device, there is no need to drill this interval to the design diameter, since the upper drilling tier has already formed the required diameter;

- helps to increase the mechanical drilling speed, penetration rate and its wear resistance;

- balance the overall load on the bit;

- to form the optimal cutting structure of the bit for effective destruction of the rock;

- increase the dynamic resistance of the bit;

- provide high controllability of the bit;

- reduce the cost of drilling;

- the bit is able to drill out in case of collapse of the walls of the well;

- one continuous structural element - the drill head and the drilling tier - creates a monolithic construction of the bit;

- balance the design of the bit by weight and the forces acting on it;

- reduce the torque on the drill stand, which prevents the occurrence of torsional vibrations, which reduce the quality of the selected core.

In FIG. 1 shows a general view of a stabilizing bunk bit for coring.

In FIG. 2 shows a bottom view of a removable drill head.

The stabilizing two-tier bit for coring 1 includes stabilizers 2, 5, cutting elements of the drilling tier 3, cutting elements of the drill head 4, a sub for connecting the bit with a core set 7, a core pipe 6, a drill head 8, a collet core cutter 9, a lever core cutter 10, the body of the core shell 11, the blades of the drilling sector 12.

The proposed stabilizing two-tier bit for coring works as follows. The flushing fluid, moving through the core pipe - 6 and the stabilizing two-tier bit for core sampling - 1, comes to the surface through the gap between the walls of the well and the bit transfers the rock destruction products to the surface. In this case, the core enters the core pipe - 6, and the entire drill rotates to the right. After filling the core pipe, the tool is lifted to the surface and core is removed from the core pipe.

The claimed solution to the proposed invention “stabilizing two-tier bit for coring” satisfies the patentability “inventive step” and is a brand new bit. In this regard, we can conclude that the alleged invention contains “significant differences” and the patentability is “novelty”. At the same time, the core receiving shell 11 and the drill head (FIG. 2) are not claimed as an invention.

Claims (1)

A stabilizing two-tier drill bit, including a shank, lower drill and upper drill with stabilizers tiers, which consist of a series of symmetrically arranged cutting blades, including radially located cutting elements, characterized in that the lower tier of the bit is represented by a removable drill head reinforced with PDC, while the drill and the upper drilling tier are connected with the possibility of joint rotation in one direction, the drill head is made with the possibility of coring, inside the stable ziruyuschego two-tier bit is bit and core barrel adapted to be coupled to a set of coring.

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