RU2114274C1 - Ball-jet tool for drilling bore-holes - Google Patents

Abstract

FIELD: bore-hole drilling equipment. SUBSTANCE: for better circulation of rock-crushing balls, lower internal part of tool body is provided with magnets. Installed on accelerating chamber and concentrically with it is bin. Rock-crushing balls are made of metal. EFFECT: higher efficiency. 1 cl, 1 dwg

Description

 The invention relates to drilling equipment, namely to ballast shells for drilling wells.

 Known ballast projectile for drilling wells, containing a cylindrical hollow body with a rock-cutting support shoe and windows for the exit of fracture products. An inkjet apparatus located above the lower end of the housing includes an overshot head, a nozzle, an acceleration chamber with windows for passage of rock cutting balls, and a working chamber containing a heater. The rock-breaking balls are made of ceramic foam [1].

 However, for effective rock destruction, balls must have a certain amount of energy. Since the energy of a ball depends on its speed and mass, the use of foam ceramic balls is not efficient enough due to the low density of foam ceramic.

 Closest to the claimed one is a ball-hole projectile for drilling wells, comprising a cylindrical hollow body connected in the upper part to the string of drill pipes and provided in the lower part with a support shoe, rock-breaking balls and a jet apparatus concentrically located in the body above its lower end connected to it at using a sealed socket and including a head for capturing with overshot, a nozzle and an accelerating chamber with windows for passage of rock-cutting balls [2].

 However, since the central part of the face is more intensively developed than the peripheral one, a depression is formed in the center of the face, the lifting of balls from which is complicated by the oncoming flow of the working agent. As a result of this, balls accumulate at the bottom, the number of ball collisions increases, and the direct interaction of the balls with the bottom is hindered, which reduces the efficiency of drilling.

 The purpose of the invention is to increase drilling efficiency by improving the circulation of rock-cutting balls.

 This goal is achieved by using a ball-blasting projectile for drilling wells containing a cylindrical hollow body connected in the upper part to the string of drill pipes and provided with a support shoe in the lower part, rock-breaking balls and a jet apparatus concentrically located in the body above its lower end, including a nozzle and an accelerating a chamber with windows for the passage of rock-breaking balls, in which, according to the invention, the inner lower part of the housing is equipped with magnets, concentrically with it on the accelerating chamber getting a hopper cutters and balls are made of metal.

 The technical effect is achieved due to the fact that the field emanating from the magnets allows the balls to be moved from the central part of the face to the walls of the body, which facilitates the further rise of the balls by the ascending flow of the working agent along the gap between the walls of the hopper and the body. The hopper mounted on the booster chamber allows you to direct the balls exactly into the windows of the booster chamber and thereby eliminate the likelihood of them getting into the annulus, which further increases the reliability of the device.

 The proposed ballast projectile for drilling wells is shown in the drawing.

 The device comprises a cylindrical hollow body 1 connected in the upper part to a drill pipe string (not shown) and provided with a support shoe 2 in the lower part, metal rock-breaking balls 3 and a jet apparatus 4 concentrically located in the housing 1 above its lower end, including a nozzle 5 and booster chamber 6 with windows 7 for passage of rock-breaking balls 3. Housing 1 in the lower inner part is equipped with magnets 8 installed in the grooves of housing 1. On the booster chamber 6, concentric with it, the hopper 9 is rigidly fixed, in the bottom and top It parts which are made conical recess. In the housing 1, windows 10 are made for the exit of destruction products.

 The device operates as follows. The shell body 1 is attached to the drill pipe string, a routed portion of metal rock-destroying balls 3 is thrown, and the shell is lowered to the bottom. By turning on the circulation of the working agent, the projectile is included in the work. In the booster chamber 6, rock-breaking balls 3 are accelerated by a jet of a working agent flowing out of the nozzle 5 and destroy the bottom of the well. Once in the field of magnets 8, metal rock-breaking balls 3 are attracted to the housing 1, freeing the bottom surface, and upward flow of the working agent rises along the gap between the walls of the housing 1 and the hopper 9. Due to the expansion of the gap above the level of the hopper 9, the rock-breaking balls 3 lose speed, fall into the conical recess of the hopper 9 and through the windows 7 fall into the booster chamber 6. Thus, metal rock-destroying balls are circulated 3. The peripheral part of the face is formed by collapse by exposing it to a reference shoe 2, the loaded weight of the drill string. The products of destruction are carried out by the upward flow of the working agent through the windows 10 of the housing 1 into the annulus and rise to the surface.

 The invention will find application in drilling wells for oil, gas and other minerals.

Claims (2)

 1. Spherical-blasting projectile for drilling wells, consisting of a cylindrical hollow body connected in the upper part to the string of drill pipes and provided in the lower part with a support shoe, rock-breaking balls and concentrically located in the body above its lower end of the jet apparatus, including a nozzle and an accelerating chamber with windows for the passage of rock-breaking balls, characterized in that the inner lower part of the body is equipped with magnets, and the hopper is rigidly fixed to the booster chamber concentrically with it.  2. The projectile according to claim 1, characterized in that the rock-breaking balls are made of metal.