SU1694851A1 - Hydraulic and mechanical bottom-hole junk basket - Google Patents

Abstract

The invention relates to the drilling of wells. The goal is to increase the reliability of work by providing the possibility of guaranteed capture of foreign objects above the bottom and bottom of the well. The spider contains a hollow body 1 with an adapter 2. a milling crown 3 and a conical inner surface 4 in the lower part. The casing 1 has a rod 5 with a piston 6 and a locking grip 7. The angle of inclination of the inner conical surface 4 relative to the longitudinal axis of the casing is chosen in the range of 20-30 or in the range of 60-70 & For the first interval of angles of inclination of the surface, 4 the number of petals 8 is chosen to be 2-9. For the second interval of angles of inclination of the surface, 4 the number of petals 8 is chosen to be 5-9. Due to the fact that the flight of the petals 8 below the crown 3. they do not break, due to their number equal to 9. their deformation on the outer plane does not occur and significant axial forces are not required to move the piston 6 with the petal clamps 7 way down. After a foreign object is gripped by the gripper 7, the piston moves below the radial hole 11. made in the housing 1, through which the flushing fluid is poured into the annular cavity, preventing the siphon effect in the housing 1. Due to the small number of petals equal to 2, their rigidity is ensured gives a guaranteed capture and retention of foreign objects. 1 il. v Ё

Description

The invention relates to the drilling of wells, namely to an emergency tool designed to clean wells from foreign objects located above the bottom or bottom of the well.

The purpose of the invention is to increase the reliability of its work by providing the possibility of guaranteed capture of foreign objects over the bottom and bottom of the well.

The drawing shows the proposed device, a longitudinal section.

Hydromechanical spider consists of a hollow body 1 with an adapter 2, a milling crown 3 and an inner conical surface 4. In the cavity of the body 1 is mounted a rod 5 with a piston 6 and petal clamps 7 installed in the lower part of the rod 5.

The angle of inclination of the inner conical surface 4 relative to the longitudinal axis of the housing 1 is chosen in the range of 20-30 ° or in the range of 60-70 °, and for the first interval of angles of inclination of the internal conical surface 4 the number of petals 8 is chosen equal to 9, and for the second interval of angles of internal inclination conical surface 4 number is chosen equal to 2-9.

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The device works as follows

In case the foreign object is at the bottom of the well, a hydrodynamic spider is selected, where the angle of inclination of the inner conical surface A is 60-70 ° with the number of petals 8 equal to 9, attached to the drill string and lowered into the well. Through the axial washing channel 9, made in the rod 5, the washing liquid is circulated, clearing the foreign object from the sludge, not income before the bottom, rotation of the drill pipe is performed. After the device is installed on the bottomhole, the drill string is loaded with a force of 4-6 tons. Under this load, 15-20 turns are made with the tool.

A foreign object located at the bottom will move into the cavity of the milling crown 3. By not stopping the circulation of the flushing fluid, the ball valve 10 is lowered into the drill pipes, which closes the axial flushing channel 9. The piston 6 with the stem 5 and the locking grip 7 are moved down. The petals 8, moving on the inner conical surface 4, are bent to the axis of the device. Due to the fact that the flight of the petals 8 below the milling crown 3, they do not break down, but due to their number equal to 9, they do not deform along the outer plane and significant axial forces are not required to move the piston 6 with the petal clamps 7 down. After a foreign object is gripped by the flap 7, the piston 6 moves below the radial bore 11 formed in the housing 1, through which the flushing liquid is poured into the annular cavity, preventing the siphon effect in the device housing 1.

In case the foreign object is above the bottom of the well, a hydrodynamic spider is selected, where the angle of inclination of the inner conical surface 4 is 20-30 ° with the number of petals 8 equal to 2, attached to the drill string and lowered into the well. After cleaning a foreign object from cuttings, the ball valve 10 is lowered into the drill pipe string.

The piston 6 with the rod 5 and the locking grip 7 is moved downwards. The petals 8 extend beyond the end of the milling crown 3 long enough to grip and hold foreign objects — a logging tool, a rotary wedge, etc. Due to the small number of petals, equal to 2, their rigidity is ensured, which ensures guaranteed capture and retention of foreign objects.

Claims (1)

After lifting the device to the surface, the milling crown 3 is unscrewed and the captured object is removed. Claims of invention A hydromechanical spider comprising a hollow body with an adapter, a milling crown and a conical inner surface in the lower part; that, in order to increase reliability in operation by providing guaranteed trapping of foreign objects above the bottom and bottom of the well, the angle of inclination of the inner conical surface of the body relative to the longitudinal axis of the body is chosen in the range of 20-30 ° or in the range of 60-70 °, and for the first interval the angle of inclination of the inner conical surface is the number of petals is 29, and for the second interval of angles of inclination of the inner conical surface the number of petals is 5-9.