RU2204007C2 - Deflecting tool for hole directional drilling with cutting the core at intervals of hole deflecting - Google Patents

Abstract

FIELD: geological prospecting drilling equipment, particularly, deflecting tools for directional drilling of holes for solid minerals. SUBSTANCE: deflecting tool core barrel consists of two parts hinged with each other for possible turning of its lower part or some angle relative to hole axis. In this ace, deflecting unit is made in the form of conical cap of bearing unit located in lower part of care barrel coaxially to it and head located in body with internal cone for possible engagement with each other. Head is located at some angle to axis of deflecting tool body; and breaker unit has lower half-wedge, extensible dies with rollers installed on upper shaft, and two pistons on common rod. One piston in the form of half-wedge is installed for engagement with extensible dies. EFFECT: higher efficiency of operation and reliability of deflecting tool orientation in curving. 2 dwg

Description

 The invention relates to the field of exploration drilling equipment and, in particular, to deflecting devices for directional drilling of exploration wells for solid minerals.

 Known diverter for directional drilling with core sampling (see DEV. ICO company brochure "THE VICDRILL HEAD"), comprising a core pipe and VIC bit, rotating inside a pair of sleeves, one of which is eccentric, for oriented bending of the core pipe to set curvature. The bushings are fixedly mounted on the outer tube body containing the packer and spring. The packer is fixed in the well by the pressure of the circulating flushing fluid during drilling with coring. The drilling cycle and coring stops after a 25 cm deep, after which the fluid circulation stops and the packer is released. The outer pipe moves forward under the action of the spring, while the sleeves move along the core pipe until the front sleeve is again installed directly behind the bit, that is, at a distance of 25 cm. When the circulation resumes, the packer is again fixed in the well and unfastens the body, and the diverter is again ready for drilling with another 25 cm coring. When working with VIC, the circulation system should include a pressure gauge and a flow meter.

 The disadvantages of this diverter include drilling cycles (6 cycles) and the possibility of displacement (rotation) of the loose housing from a given orientation direction during the switching of the outer pipe; during the recess, the constantly bent core pipe experiences significant alternating loads, which can lead to its breakage, set the curvature is determined only by the bending of the core pipe, therefore it is not stable and not adjustable.

 These disadvantages reduce the efficiency and reliability of the orientation of the diverter when typing their curvature.

 A well-known projectile for directional drilling of wells, comprising a housing, a core pipe connected by means of a spline connection to the upper shaft, a deviation unit, an anchor unit (see ed. St. USSR 972033 A, class E 21 B 7/08, 1982 prototype )

 The disadvantages of this projectile is a significant dependence of the reliability of the release and the intensity of the curvature on the degree of development of the wellbore.

 The essence of the invention lies in the fact that the core pipe is made of two parts pivotally connected to each other with the possibility of rotation of its lower part at an angle to the axis of the well. The deflection unit is made in the form of a conical ogolovnik of the bearing unit, which is located on the lower part of the core pipe coaxially with it, and located in the tip body with an internal cone with the possibility of interaction between them. The tip with the inner cone is located at an angle to the axis of the body of the deflector. The release unit comprises a lower half-wedge mounted on the upper shaft, extendable rams with rollers and two pistons on the common stock, one of which, having the shape of a half-ramp, is arranged to interact with extendable rams.

 Compared with the prototype of the inventive device provides reliable fastening of the deflector at any degree of wellbore development and precise control of the intensity of curvature by replacing the replacement part of the deflector with a different angle of bias.

 In FIG. 1 schematically shows a diverter in the transport position, FIG. 2 - in the workplace.

The diverter consists of rotating and non-rotating parts. The rotating part contains: a rock cutting tool 1, a core tube 2 with a spline connection 4, consisting of two parts, with the ability to deviate in its lower part through the hinge 3 from the axis of the well by a certain angle, the upper shaft 5 with the throttle 6 and the orienting adapter 7. Non-rotating part contains: bearing assembly 8 with a conical ogolovnik; tip 9 (interchangeable) with an inner cone, which is deployed with respect to the axis of the diverter by a certain angle; the housing 10, in which are located: the lower half-wedge 11, three dies 12 located at an angle of 120 ^o , a piston 13 (having the shape of a half-wedge) and a piston 14 mounted on one rod 17, in order to increase the release force, return spring 15, adapter 16 .

 During operation, the diverter in the transport position is lowered into the well and oriented above the bottom. Flushing fluid is supplied through the drill pipe string. The throttle 6 creates a pressure drop in the cavities A and B and under its influence the pistons 13 and 14 with the rod 17 move down the upper shaft 5, compressing the return spring 16, while pushing the dies 12 until the latter stops against the borehole wall, creating a reliable release of the deflector body in well.

 When setting the diverter to the bottom, the generated axial force through the orienting adapter 7, the upper shaft 5 and the lower half wedge 11 is transmitted to the housing 10, which, moving down, selects the gap between the cone of the bearing assembly 8 and the tip 9, the movement of the diverter housing is compensated by a spline connection 4.

 After closing the conical surfaces, the lower part of the core pipe 2, due to the hinge 3, takes a position with a given angle of displacement relative to the axis of the deflector.

 The axial load from the housing 10 through the tip 9 and the bearing assembly 8 is transmitted to the rock cutting tool 1, providing separate transmission of the axial load and torque during operation of the deflector. The core being drilled enters the core pipe 2. At the end of the curvature cycle, the flow of flushing fluid is stopped and the axial load is removed. Pistons 13 and 14 with the stem 17 are moved upward by the action of the return spring 15, the dies 12 are recessed in the housing 10, the rock cutting tool 1, the bearing assembly 8, the lower part of the core tube is returned to its original position under its own weight. The core is held by a core ring. The diver is ready to rise.

Claims (1)

 A diverter for directional drilling of wells with coring at intervals of artificial curvature, comprising a body, a core pipe connected by a spline connection to the upper shaft, a deviation unit, an attachment unit, characterized in that the core pipe is made of two parts that are pivotally interconnected with each other turning its lower part at an angle to the axis of the well, while the deviation unit is made in the form of a conical ogolovnik bearing unit, which is located on the lower part of the core pipe coaxial with it, and located in the body of the tip with the inner cone with the possibility of interaction between them, and the tip with the inner cone is located at an angle to the axis of the body of the deflector, and the release unit contains mounted on the upper shaft lower semi-wedge, retractable dies with rollers and two common rod piston, one of which, having the form of a semi-wedge, is installed with the possibility of interaction with retractable dies.

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