RU198234U1 - Diamond drill bit - Google Patents

Abstract

The utility model relates to the field of creating a rock cutting tool used to change the direction of wells using continuous milling type deflectors. The diamond drill bit contains a threaded body and a diamond-containing matrix, while the lateral part of the diamond-containing matrix is made in the form of piles with an angle of inclination n is the number of end diamond tools; n is the number of side diamond tools pressed against the borehole wall; P is the cutting-shearing force of the rock with a diamond cutter, daN; P - deflecting force, daN; μ is the coefficient of friction of the diamond cutter on the rock; P-axial force, daN; ϕ is the angle of internal friction of the rock, degrees. The utility model is aimed at improving the accuracy of the process of bending wells with continuous rejects of the milling type using diamond drill bits. 2 ill.

Description

The utility model relates to the field of creating a drilling rock cutting tool used to change the direction of wells using continuous deflectors of the milling type.

Known drilling rock cutting tool for use with continuous deflectors, including a threaded housing, rock cutting elements [Neskoromnykh V.V. Directional Drilling and Core Measurement: A Textbook. - 2nd ed. - M .: INFRA-M; Krasnoyarsk: Sib. Feder. Univ., 2015.S. 217-219]. The disadvantages of such bits include a high error when performing work on the curvature of the wells associated with the occurrence of disorienting forces due to friction of the lateral armament of the rock cutting tool on the rock and the rock's resistance to destruction.

Known drill rock cutting tool [catalog rock cutting tool company NIN "BURINTEH", http://burintekh.ru/upload/iblock/4cd/4cdfdb68819dd588c11063e160267946.pdf], including inclined side blades containing rock cutting elements. The disadvantage of these bits is the deviation of the plane of curvature from the design direction when using milling-type continuous deflectors due to the inequality of the forces of rock resistance to destruction by side arms and the elastic reaction of the rock to axial movement when the bit is pressed against the borehole wall.

The proposed utility model is aimed at improving the accuracy of the process of bending the wells with continuous diverters of the milling type using diamond drill bits.

в направлении вращения инструмента.The specified technical result is achieved due to structural changes in the lateral armament of the diamond bit - the location of the diamond armament in the form of diamond-containing racks with a slope at a certain angle y, which is found from

in the direction of rotation of the tool.

не обнаружены в известных технических решениях, что предполагает соответствие заявляемого алмазного бурового долота критерию новизны.The set of features of the claimed utility model, namely the location of the lateral armament of the diamond bit in the form of inclined diamond-containing posts and their inclination at an angle y, which is found from the dependence

not found in the known technical solutions, which implies the compliance of the claimed diamond drill bit with the novelty criterion.

The essence of the utility model is illustrated by drawings, where:

in FIG. 1 shows the inventive diamond drill bit;

in FIG. 2 shows a diagram of the force acting on an inclined diamond-containing stand during operation.

In FIG. 1 and 2 are indicated:

thread - 1; diamond drill bit body - 2; inclined diamond-containing staff - 3.

During operation of the diamond drill bit, fixed on the diverter continuous milling type using thread 1, there is a deviation of the plane of set of curvature from the design direction due to the disorienting force R _d , which is predetermined by the process of destruction of the rock by diamond cutters on the side surface of the diamond-containing matrix under the action of deflecting force P _off. The combined action of forces F _d and F _none produces resultant force P _r.

The dependence for evaluating the angle of deviation of the plane of set of curvature A (Fig. 1):

The condition for the accuracy of the process of bending the wells with milling type continuous diverters using diamond drill bits is to minimize the disorienting force R _d .

Since the force P _{d is} caused by the resistance of the rock to cutting-chipping with a pressed part of the lateral armament of the diamond bit, the dependence for P _{d is} as follows:

where R _p - the force of cutting-chipping rocks with a diamond cutter, daN; h is the depth of penetration of the diamond cutter into the rock, mm; d is the diameter of the diamond tool, mm; n _b - the number of side diamond tools pressed against the borehole wall; γ _ck - rock cleavage angle in front of the front face of the cutter, degrees; σ _SK - rock breaking strength, daN / mm ² ; μ is the coefficient of friction of the diamond cutter on the rock.

The depth of penetration of the diamond cutter into the rock can be calculated from the following relationship:

where p _W - rock hardness, daN / mm ² ; ϕ is the angle of internal friction of the rock, degrees.

The mechanism of the bit with inclined diamond of bars 3 on the side of the surface is determined by reaction force of the end and side _r n _b n diamond cutter with the rock under the effect of axial deflection and P _axes P _none effort. Given that part of the axial force P _{OS is} compensated by the force of pressing the cutters, the force P _i will act on each end and side diamond tool, defined as:

where P _OS - axial force, daN; n _t - the number of end diamond tools.

The axial introduction of diamond cutters in the head of the bit is hindered by the reaction of the rock being destroyed P _c directed from the rock in the direction of the cutters that determine the geometry of the inclined head. Given the fact that the resistance of the hard rock is primarily due to its elastic reactions, which can be expressed in terms of the coefficient of internal friction tgφ, all lateral incisors n _b, clamped to the borehole wall _off force P acts resisting force:

Since the lateral incisors that have penetrated into the rock and form a diamond-containing stick are inclined, part of the resistance force is transformed into a horizontal lateral force P _t , the value of which, taking into account the inclination angle γ, is defined as:

In order to eliminate the angle of deviation of the plane of set of curvature Δ, and therefore to increase the accuracy of the process of bending the wells with continuous milling cutters, it is necessary to provide such a value of the angle of inclination of diamond-bearing piers γ so that the value of P _g fully compensates for the value of the disorienting force R _d :

whence the angle of inclination of the diamond-containing staff γ is defined as:

The use of the proposed diamond drill bit will improve the accuracy of bending of wells with milling type continuous diverters using diamond drill bits by compensating for the disorienting force P _d arising due to the lateral arms of the diamond bit being pressed against the borehole wall, the horizontal component P _{g of the} reaction of the rock being destroyed P _s .

Claims (1)

Diamond drill bit, consisting of a body with a thread and a diamond-containing matrix, characterized in that the lateral part of the diamond-containing matrix is made in the form of racks with an angle of inclination

where n _t is the number of end diamond cutters; n _b - the number of side diamond tools pressed against the borehole wall; R _p - the force of cutting-chipping rocks with a diamond cutter, daN; P _off - deflecting force, daN; μ is the coefficient of friction of the diamond cutter on the rock; P _OS - axial force, daN; ϕ is the angle of internal friction of the rock, degrees.