CS243400B1 - Submersible rotary impact drill with submersible hammer - Google Patents

Abstract

tapping drilling, which could not be achieved with previous centralizers. The centralizer according to the invention is a cylindrical tube slipped over a downhole hammer, the lower end of which is fixed to the hammer just above the drill bit and the upper end to the connector of the handling tube. An adequate annular gap must be maintained between the centralizer body and the borehole for the passage of drilling cuttings. A centralizer constructed in this way ensures the straightness of the borehole without causing additional resistance, new loading of the drilling rig or even blocking of rotation.

Description

BACKGROUND OF THE INVENTION The present invention relates to a rotary percussion drill with a plunger hammer.

For rotary percussion drilling with a submersible hammer, no ejection and stabilization devices are available. When using finned centrators, rotation is blocked. Such prior art rotary drill centers with a smooth cylindrical surface (most commonly used 3 above each other) are unsuitable here, since they can be incorporated into the drill string up to the hammer, thus leaving the centrator too high above the drilling tool itself function.

The essence of the centrator for rotary percussion drilling with an immersion hammer according to the invention is that a centrator tube is threaded over the immersion hammer, the upper end of which is attached to the rod and the lower end is mounted on the hammer body just above the crown. An intermediate ring must be maintained between the centrator tube and the borehole wall for the passage of the drill bit.

The design of the centrator enables stabilization and centering of the drilling tool during rotary percussion drilling, which ensures the borehole is straight and allows the planned profile of the equipment to be used.

The centerer is easily removable and the method of attachment allows it to be incorporated into commonly used drilling columns. Its production is easy, its costs are low, simplicity and compactness of the structure guarantees its resistance even in demanding rock conditions.

Its use does not cause a new load on the drilling rig, because of its construction does not create additional rotational resistance - drilling column.

In the drawing, FIG. 1 shows a front view of an embodiment of the actual centrator. and attaching it to the drill string. In Fig. 2, the attachment of the centrator to the linkage of the handling bar is shown.

The tube of the centrator 1 is terminated at the upper end by a ring, by means of which the guide is fastened to the link of the handling bar 2 by means of a flat tongue 6 and axially secured by the link 8.

At the lower end, the centratortic tube 1 is terminated by a lower ring J, which is supported by a drill hammer. It is close to the drill bit 5 · The inner space of the centrator is sealed to the drill column by sealing rings 2 ·

The invention is applicable to rotary percussion drilling rigs for drilling wells and exploration or other wells.

Claims (1)

SUBJECT OF THE INVENTION A rotary percussion drill center with an immersion hammer, characterized in that a centrator tube (1) is passed over the immersion hammer (4), the upper end of the centrator tube (1) being attached to the lance connector (7) and the lower end of the tube (1). 1) is placed on the hammer drill (4) just below the drill bit (5).