RU175172U1 - LOCK FOR DRILL PIPE JOINT - Google Patents

Abstract

The utility model relates to a drilling tool used in drilling vertical and directional (inclined - or vertical - horizontal) wells, providing multidirectional rotation of drill pipes, as well as emergency and process pipes for fishing tools and submersible equipment. A lock for connecting drill pipes, including a nipple (2) with a sleeve (3), a cylindrical roller (8) with a spring (9), an oil seal ring (11), and the connection of the nipple (2) with a sleeve (3) is made in the form of a key - plates (5) installed by one of its half in the internal grooves of the nipple (2), and the other half - in the internal grooves of the coupling (3), and to transmit the multidirectional axial force, the nipple (2) and the coupling (3) are pulled together by means of a half coupling ( 6), having in its lower part a through hole for a cylindrical roller (8) with a spring (9), protecting it from unscrewing thread, while the stuffing box-ring (11) is located between the ends of the coupling (3) and the nipple (2), sealing the discharge line of the flushing fluid. 3 ill.

Description

The utility model relates to a drilling tool used in drilling vertical and directional (directional or vertical-horizontal) wells, providing multidirectional rotation of drill pipes, as well as emergency and process pipes for fishing tools and submersible equipment.

Known quick conical connection of screws containing a coupling, in the walls of which are welded bushings with fixing bolts, nipples, key connections, including dowels and grooves, with two keyways and two holes extending into the plane of the coupling in the same plane along the axis them, under the bushings with fixing bolts, and in the body of the nipple in the same plane along the axis, two grooves are made with dowels fixedly installed in them and two holes for fixing bolts (RF Patent No. 229666 IPC Е21В 17/046, publ. ikovano 10.04.2005 city).

A significant drawback of this connection is the lack of fixation of bolts from twisting from the thread during drilling. When drilling with shallow boreholes and pits with screws, this drawback is not so significant, because the time required to drill them is negligible and after drilling is completed, the screws are removed to the surface and the bolts on the joints can be tightened. However, when drilling relatively deep wells, the reliability of bolt fastening in the joints cannot be controlled, and this can create an emergency.

A threaded pipe connection is also known, including a sleeve with a spline section, a nipple with a reciprocal slot section and a clamp for their working position, which contains a spring-loaded, relative to the sleeve in the tangential direction, snap ring located in the cavity formed by the grooves of the sleeve and nipple in front of their splined sections moreover, in order to increase the reliability of the connection while ensuring mechanization of the assembly-disassembly process, it is equipped with fingers with beveled end surfaces, the snap ring is it is relative to the coupling in the tangential direction, it is made with inclined grooves on the lower end for the interaction of their surfaces with the end surfaces of the fingers and has ends on the inner surface of the ends, the nipple slots for interaction with them have a mating end surfaces, and the coupling is made with axial peripheral holes to accommodate the fingers, and the free ends of the latter protrude beyond the dimensions of the coupling. (Patent SU 1641977, IPC Е21В 17/046, Е21В 17/02, published April 15, 1991).

The disadvantage of the connection is the complexity of its manufacture due to the presence of splined sections of the coupling and nipple, grooves, holes, the implementation of which requires high-tech equipment, different purpose machines. In addition, the structure is cumbersome, especially the mechanism of rotation and return of the spring-loaded ring and, when operating in the presence of drilling fluid, with overloads on the structure, its failures are possible.

The closest to the claimed technical solution for the totality of features, and we have chosen for the prototype, is a threaded-free connection of drill rods containing connecting elements - a nipple and a coupling, interacting with their end surfaces when transmitting the feed force in the drilling mode, and when removing the drill stand from the well, interact by means of one or more cylindrical rollers arranged in parallel transverse planes, moreover, on the cylindrical surface of the nipple, outer grooves, and on the end surface of the coupling end protrusions are made - teeth that enter the grooves and interact with them with their straight-line profiles when transmitting torque. (RF patent No. 2403370, IPC ЕВВ 17/046, published November 10, 2010)

The disadvantage of this connection is the complexity and complexity of manufacturing the grooves of the nipple and the teeth of the coupling, which affects the increase in their cost.

The objective of the proposed utility model is the creation of such a lock for connecting drill pipes with which the drill string could be used not only when drilling wells, but also as an emergency as well as a technological tool for submersible equipment.

The task of improving the lock for connecting drill pipes is solved by connecting the nipple to the coupling in the form of a key-plate installed with one half of it in the internal grooves of the nipple and the other half in the internal grooves of the coupling, and for transmitting multidirectional axial forces, the nipple and coupling

they are pulled together by means of a coupling half, which has in its lower part a through hole for a cylindrical roller with a spring, which interacting with each other prevents it from being unscrewed by the thread, while the stuffing box is located between the ends of the coupling and the nipple, sealing the discharge line of the flushing fluid.

The connection of the nipple and the coupling in the form of a key-plate for transmitting torque from the pipe to the pipe, one of its half installed in the internal grooves of the nipple, and the other half in the internal grooves of the coupling, as well as the tightening of the nipple and the coupling using the coupling, for transmitting multidirectional axial force, allows to simplify the design of the lock for connecting drill pipes and increase its reliability.

An analysis of the known technical solutions, carried out on the basis of scientific, technical and patent documentation, showed that the set of essential features of the claimed technical solution is not known from the prior art, therefore, it meets the conditions of patentability “novelty”.

The claimed technical solution is illustrated by the drawings:

FIG. 1 - Lock for connecting drill pipes.

FIG. 2 - Section of the lock for connecting drill pipes to the nipple.

FIG. 3 - Section of the lock for connecting drill pipes to the coupling.

The inventive lock for connecting drill pipes is presented; the lead pipe 1 welded to the nipple 2, transmitting torque through it to the sleeve 3, also welded only to the drill pipe 4, using a connection made in the form of a key-plate 5, which one half enters the grooves of the nipple and the other half into the grooves of the coupling. To transfer multidirectional axial loads from the nipple 2 to the coupling 3, they are pulled together by a coupling half 6, the thrust part of the threadless hole which abuts against the collar 7 of the nipple, and the internal threaded part is screwed onto the coupling 3. In its lower threaded part, the coupling 6 has a through hole for the cylindrical roller 8 with a spring 9, which abuts against the collar 10 of the coupling and prevents it from being unscrewed by the thread. Between the collar 7 of the nipple and the end face of the sleeve 3 is a stuffing box-ring 11, designed to seal the discharge line of the flushing fluid.

The proposed lock for connecting drill pipes works as follows: when the drill pipes are lowered into the well, the coupling 3 with the drill pipe 4 is mounted on an elevator (not shown), and a key-plate 5 is inserted into its internal grooves 5 half its length. An oil seal-ring 11 is placed on the end face of the sleeve 3, after which the nipple 2 with the coupling half 6, the lead pipe 1 or the drill pipe 4 (depending on the drilling depth) is installed in the sleeve 3, while the key plate 5 is halfway inside the nipple 2, with a gap, and the collar 7 of the nipple 2 abuts against the stuffing box ring 11. The coupling half 6, which is held on the collar 7 of the nipple 2, is screwed onto the coupling 3 by the external thread and pulls the nipple 2 and the coupling 3 together. After this, the coupling half 6 is fixed from unscrewing, during drilling, with the help of a cylindrical roller 8, which is inserted into the through hole of the coupling half 6 and the spring 9, which is located under the collar 10 of the coupling 3, is fixed there using a spring 9, which is a hollow cut along on the one hand, a steel cylinder that prevents the cylindrical roller 8 from slipping out of the openings of the coupling half 6.

When lifting the drill pipe, all operations occur in the reverse order.

The claimed technical solution meets the requirement of industrial applicability and can be manufactured on standard equipment using modern materials and technologies.

Claims (1)

A lock for connecting drill pipes, including a nipple with a sleeve, a cylindrical roller with a spring, a stuffing ring, characterized in that the connection of the nipple with a sleeve is made in the form of a key-plate installed with one half in the internal grooves of the nipple and the other half in the internal coupling grooves, and for transmitting multidirectional axial forces, the nipple and coupling are pulled together using a coupling half, which has a through hole for a cylindrical roller with a spring in its lower part that protects it from unscrewing by thread This ring seal is located between the ends of the coupling and the nipple, sealing the discharge line of the flushing fluid.

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