SU899858A1 - Apparatus for running-in and cementing casing lengths - Google Patents

Description

The invention relates to the fastening of oil and gas wells and can be used for cementing sections of casing strings.

A device for lowering and cementing liners and sections of casing, including a housing, a nut with a left-hand thread, a sub and a bearing barrel, and using a faceted pipe, the left-hand thread of the nut is relieved of load [1].

Closest to the proposed technical essence is a device for lowering and cementing countersunk casing strings, including a body, a left-handed nut, a multi-row ball joint, a sub and a bearing barrel, in which the sub and left nut are connected by a splined joint [2].

A common disadvantage of the known devices is the possibility of uncontrolled separation of the stationary casing and the movable drill string during the rotation of the pipes due to the friction forces between the bearing race.

The purpose of the invention is to increase the reliability of the device by preventing uncontrolled separation of drill and casing pipes.

The specified goal is achieved by the fact that the bearing trunk and sub with

You are united by a spline connection.

In FIG. 1 shows a device, a section ·, in FIG. 2 is a section AA in FIG. 1 ·, in FIG. 3 - section BB in FIG. 1.

'5 The device consists of a housing 1, a bearing barrel 2, suspended on a sub 3 and connected to it by means of splines 4. Inside the supporting barrel 2, blocking the flushing ® holes 5, there is a sleeve 6 with a socket for a throw-ball 7, which is connected with a bearing barrel with two pins 8. The bearing barrel 2 lips entailed a multi-row ball joint 9, which is pressed against the splines 4 from the bottom by a thrust sleeve 10 connected by a taper thread to the bearing barrel. The seal between the housing 1 and the thrust sleeve 10 is provided by the gland II and the compression sleeve 12. From above, the ball bearing 9 is pressed by a nut 13 connected to the housing 1 by a left trapezoidal thread. On the inner surface of the nut 13 there are slots 14 that interact with the grooves 15 of the sub 3 when it is lowered .. Between the nut 13 and the ball bearing 9, an intermediate ring 16 is installed with the outer slots 17 interacting with the internal grooves 18 of the housing 1.

After lowering and cementing the casing, which is carried out in the usual way, a ball 7 is thrown into the drill pipe, which covers the bore of the sleeve 6. When excessive pressure is created, the pins 8 are cut, the bushing 6 is lowered and four holes 5 are opened in the carrier shaft 2 and the sub 3, through which flushing the annular space behind the drill string. At the same time, during the injection of cement mortar, pfavochny fluid, the flight of the ball, opening the holes and further flushing while waiting for the cement to harden, the drill string rotates uniformly.

During the rotation of the drill string in the device, the body 1, the nut 13, the intermediate ring 16, the outer casing of the ball joint 9 remain the fixed parts. The remaining parts rotate together with the bar string, preventing its possible sticking in the open barrel.

In the event that external cages are rotated together with ball bearings (for example, due to pollution), and on the surface, not knowing this, they turn on the rotor and begin to rotate the drill pipes, they do not spontaneously turn off, since the rotational (radial) force acting on a bearing race cannot be transmitted to a left-hand nut. The force is transmitted to the intermediate ring, which is locked with its slots 17 in the grooves 18 of the housing.

After the hardening of the cement mortar is completed, the rotation of the drilling tool is stopped and, slowly turning it, is lowered. Aligning the grooves 15 of the sub 3 and the slots of the .13 nut, unloading the boring tool on the bearing barrel 2, and the bearing barrel through the slots 4 on the multi-bit support, thereby freeing the nut 13 from tightening, unscrew it by turning it to the right. After the flap of the nut 13, which rises along the grooves, the drilling tool is disconnected from the housing 1 and rises from the well. Only the casing remains in the well.

The technical and economic effect is to increase the commercial speed, which allows only at 2 wells to reduce costs by 137 thousand rubles.

Claims (2)

The invention relates to the fastening of oil and gas wells and can be used for lowering and cementing sections of casing strings. A device for lowering and cementing shanks and sections of casing strings is known, including a housing, a nut with a left-hand thread, a sub and a supporting shaft, and using a faceted pipe. The left nut thread is unloaded. l. The closest to the proposed technical essence is a device for lowering and cementing the casing, including a housing, a nut with a left-hand thread, a multi-ball joint, a sub and a supporting shaft, in which the sub and the left nut are connected by a splined joint 2. A common disadvantage The known devices are the possibility of uncontrolled separation of the fixed casing and movable drill strings during the rotation of the tubes due to the frictional forces between the bearing collars. The purpose of the invention is to increase the reliability of the device by preventing the uncontrolled separation of drilling and casing. This goal is achieved in that the carrier shaft and the sub are connected by a spline connection. FIG. 1 shows a device, a sectional view; FIG. 2 - section A-Ana of FIG. 1, in FIG. 3 shows a section BB in FIG. 1. The device consists of a housing 1, a carrier trunk 2, suspended on the sub 3 and connected to it via slots 4. Inside the carrier trunk 2, blocking the washing holes 5, there is a sleeve 6 with a socket for a casting ball 7, which is connected to the carrier barrel with two pins 8. Unsupported barrel 2 is mounted in a multi spherical support pressed against the splines 4 from the bottom by a stop sleeve 10 connected by means of a conical thread with a bearing trunk. The seal between the casing 1 and the thrust sleeve 10 is provided with an epiploon P and the gland sleeve 12. From above, the ball bearing 9 is pressed by a nut 13 connected to the casing 1 with a left trapezoidal thread. On the inner surface of the nut 13 there are slots 14, which interact with the grooves 15 of the sub 3 when lowering it. Between the nut 13 and the ball bearing 9, an intermediate ring 16 is installed with the outer slots 17 interacting with the inner grooves 18 of the housing 1. After descent and cementing the casing, which is carried out in the usual way, the ball 7 is thrown into the drill pipes, which blocks the opening of the sleeve 6. When the overpressure is created, the pins 8 are cut off, the sleeve 6 is lowered and four holes 5 in the bearing section are opened Tolle 2 and sub 3, through which the annular space is washed downstream of the drill string. At the same time, in the process of pumping cement mortar, p5) of the production liquid, ball flight, opening of the holes and further cleaning of the cement, the drill string rotates evenly while waiting for the cement to harden. When the drill string is rotated in the device, the body 1, the nut 13, the intermediate ring 16 remain fixed, the outer parts of the ball bearing 9, the rest of the parts rotate together with the boring column, preventing its possible sticking in the open shaft. In the event that the outer cages (for example, due to contamination) are rotated together with the ball bearings, and on the surface, without knowing it, they turn on the rotor and begin to rotate the drill pipes, their 84 folds do not occur, as the rotational (radial) force acting on the bearing race cannot be transferred to the nut with the left thread. The force is transmitted to the intermediate ring, which with its slots 17 stops in the grooves 18 of the Kopnyria. After the end of hardening of the cement slurry, the rotation of the boring tool is stopped and, slowly turning it, it is lowered. Aligning the grooves 15 of the sub 3 and the splines 14 of the LZ nuts, unloading the drilling tool onto the carrier 2, and carrying the trunk through the splines 4 onto the multi-bit support, thereby freeing the nut 13 from the tightening, turn it to the right. After the flare nut 13, which is raised upward in the grooves 15, the drilling tool is disconnected from the housing 1 and lifted out of the well. Only the casing remains in the well. The technical and economic effect is to increase the commercial speed, which allows only 2 wells to reduce costs by 137 thousand rubles. Apparatus of the Invention A device for launching and cementing sections of casing strings, including a housing, a multi-ball joint, a nut with a left-hand thread, a sub, and a supporting barrel, characterized in that, in order to increase the reliability of the device by preventing the uncontrolled separation of drilling and casing. pipes, carrying barrel and sub connected spline connection. Sources of information taken into account in the examination 1. USSR author's certificate №581244, cl. E 21 V 33/1, 1973. 2. USSR author's certificate in application number 2557380, cl. E 21 V 33/14 1977 (prototype).