RU178979U1 - Mechanical anchor for installing a whipstock on the bottom of the well - Google Patents

Abstract

The utility model relates to the field of drilling and overhaul of oil and gas wells and can be used to install a whipstock on the bottom of the well. The mechanical anchor includes a housing in which at least one window is made with at least one retractable ram that enters a trapezoidal protrusion in the groove of the fixing element mounted inside the anchor housing with the possibility of axial movement of the housing along the locking element, and the groove of the locking element repeats the shape of the protrusion of the retractable die the locking element is fixed from axial movement by a shear pin. The locking element is made in the form of a piston connected to the shaft by a threaded connection, while at least two retractable rams are installed in the piston grooves, which are made on the outside of the gear shape, and on the inside the retractable ram has a trapezoidal prototype that repeats the piston groove, a threaded stop is fixed on the lower part of the shaft, and a fixing part in the form of a collet is located in the lower part of the housing, fixed to the shaft by a threaded connection and resting one end against the thrust nut, vkruch hydrochloric into the housing, and the other in the biasing nut, wherein the shaft casing is also located, connected to the biasing nut, wherein the shear pin is screwed into the housing, and a piston, which in the upper housing portion connected by hinge sub thread. According to the utility model: - the housing, the shaft, the threaded stop and the piston are made of structural alloy steel 40X; - the collet is made of structural steel spring 60С2А; - the thrust nut, compression nut and casing are made of steel 45; - dies, shear pin and articulated sub made of 40X steel. The use of the utility model provides rigid fixation of the anchor in the casing by preventing the anchor from tripping back after being installed in the casing for reliable installation of the deflector on the bottom of the well.

Description

The utility model relates to the field of drilling and overhaul of oil and gas wells and can be used to install a whipstock on the bottom of the well.

Known is an anchor containing a rod, a cone with jamming dies, a synchronizer for moving the dies, a lock case with a collet in the form of spring petals, a friction clutch with spring-loaded slats, rigidly connected to the lock case. The right thread is made on the outer surface of the stem, the collet is mounted on the rod inside the lock case, on the inner surface of the ends of the spring petals there is a right thrust thread engaged with the stem thread, on the outer surface of the petals there is a groove in which the damping rings are installed to regulate the stiffness pressing the spring petals, the collet is fixed from longitudinal movements by the inner protrusion of the lock case, and from scrolling relative to the lock case and the bend of the spring GOVERNMENTAL lobes rigidly fixed to the housing the lock plates which are in splined connection with the petals of the collet (patent RU 2223382, IPC E 21 B 23/00, publ. 10.02.2004).

The disadvantage of a mechanical anchor is the difficulty in manufacturing and assembling the device.

Known hydromechanical anchor, which contains a housing with an inclined guide, a die with a sample made with the possibility of moving upward along an inclined surface of the housing, a spring-loaded insert inserted into a sample of a die, made with the possibility of protruding outward beyond the dimensions of the die. In this case, the housing is equipped with a technological groove, and the die selection is cylindrical with an axis perpendicular to the axis of the housing and with a through hole in the base of the sample. The liner is spring-loaded inward in the form of a hydraulic piston and is equipped with a pin under the through hole of the sampling, the protruding part of which in the transport position interacts with the technological groove of the housing for fixing the housing and the die relative to each other. The inner cavity formed by the liner and the sample is in communication with the pipe string with a flexible tube placed within the body and the die (patent RU 2397306, IPC ЕВВ 23/00, published on 08/20/2010).

The disadvantage of the hydromechanical anchor is the difficulty of manufacturing and assembling the device.

Known mechanical anchor placed around a solid barrel, having a housing, grips with springs, friction pads with springs, covers on the armature body (patent RU 172462, IPC ЕВВ 7/08, published on July 11, 2017).

The disadvantages of the known mechanical anchor are:

- metal consumption, since the anchor consists of a large number of components;

- the unreliability of the fixation of the retractable dies in the working position, as a result of which the armature can trigger back;

- the complexity of the design.

Known anchor connected to the wedge diverter. A rectangular window is made in the anchor body, in which a retractable plate is placed, which enters with a trapezoidal protrusion in the groove of the fixing wedge installed inside the anchor body, and the groove of the fixing wedge repeats the shape of the protrusion of the retractable plate, and the fixing wedge protrudes beyond the dimensions of the anchor body by at least a length its working stroke and is fixed from axial movement by a shear pin of the wedge (patent RU 135698, IPC ЕВВ 7/08 (2006.01), publ. 12/20/2013). Taken as a prototype.

A disadvantage of the known mechanical anchor is the lack of fixation of the retractable die in the working position, as a result of which the armature can trigger back.

The objective of the utility model is the rigid fixation of the anchor for the reliable installation of the deflector wedge at the bottom of the well.

The technical result is the prevention of reverse operation of the anchor after it is installed in the casing.

The problem is solved, and the technical result is achieved by a mechanical anchor, including a housing with retractable dies, a fixing element with grooves mounted inside the anchor housing with the possibility of axial movement of the housing along the fixing element, and the fixing element is fixed from axial movement by a shear pin. In contrast to the prototype, the locking element is made in the form of a piston connected to the shaft by a threaded connection, while at least two retractable dies are installed in the piston grooves, which are made on the outside of the gear shape, and on the inside of the retractable die has a trapezoidal protrusion, repeating piston groove, with a threaded stop fixed to the lower part of the shaft, and a fixing part in the form of a collet, fixed to the shaft by a threaded connection and resting against one end, is located on the lower part of the shaft into a thrust nut screwed into the housing, and another into the compression nut, and on the shaft there is also a casing connected to the compression nut, while the shear pin is screwed into the housing, as well as into the piston to which the hinged adapter is connected through the thread in the upper part of the housing .

According to the utility model:

- the housing, shaft, threaded stop and piston are made of structural alloy steel 40X;

- the collet is made of steel structural spring-spring 60С2А;

- thrust nut, pinch nut and casing are made of steel 45;

- dies, shear pin and swivel sub are made of 40X steel.

The technical result is achieved as follows

A fixing part, a collet, is introduced into the anchor. Retractable dies are fixed in the working position due to ratchet engagement of the collet with the shaft, which prevents the armature from tripping after being installed in the casing. Rigid anchor fixation in the casing is provided.

The essence of the utility model is illustrated in the drawing, which shows the claimed mechanical anchor.

Anchor contains:

1 - shaft

2 - fixing element - piston

3 - case

4 - threaded stop

5 - fixing part - collet

6 - persistent nut

7 - clamping nut

8 - casing

9 - retractable die

10 - shear pin

11 - articulated sub.

The device operates as follows.

The anchor, together with the whipstock, on the pipe string (not shown) is lowered into the well in the transport position and abuts 4 against the bottom. Then the axial force is applied to the hinged sub 11, which, at a certain value, begins to move down along the piston 2 with the housing 3, as a result of which the pin 10 is cut off. The clamping nut 7 and the thrust 6 nut connected to the housing, the casing 8 and the collet 5 also begin to move down along the shaft 1 until the retractable jamming dies 9, which are in the recessed position, extend through the windows in the housing and fix the position of the anchor in the well . In this case, the reverse operation of the anchor is impossible, since this is prevented by the ratchet engagement of the collet 5 with the shaft 1. At this, the translation of the anchor to the working position ends. Reliable installation of the whipstock on the bottom of the well is ensured.

Thus, the application of the utility model provides rigid fixation of the armature in the casing by preventing the armature from tripping after it is installed in the casing for reliable installation of the deflector on the bottom of the well.

Claims (5)

1. Mechanical anchor, comprising a housing with retractable dies, a locking element with grooves mounted inside the anchor housing with the possibility of axial movement of the housing along the locking element, the locking element is fixed from axial movement by a shear pin, characterized in that the locking element is made in the form of a piston, connected to the shaft by means of a threaded connection, while at least two retractable dies are installed in the piston grooves, which are made on the outside of the gear shape, and on the inside on its side, the retractable die has a trapezoidal protrusion that repeats the piston groove, and a threaded stop is fixed on the lower part of the shaft, and a fixing part in the form of a collet is fixed to the shaft, fixed to the shaft by a threaded connection and resting against one end of the thrust nut screwed into the housing and the other in the pinch nut, and on the shaft there is also a casing connected to the pinch nut, while the shear pin is screwed into the housing, as well as into the piston, to which the hinged sub is connected to the upper part of the housing redstvom thread. 2. The anchor according to claim 1, characterized in that the housing, shaft, threaded stop and piston are made of structural alloy steel 40X. 3. The anchor according to claim 1, characterized in that the collet is made of steel structural spring-spring 60C2A. 4. The anchor according to claim 1, characterized in that the thrust nut, compression nut and casing are made of steel 45. 5. Anchor according to claim 1, characterized in that the dies, shear pin and articulated sub are made of 40X steel.

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