SU1590538A1 - Method of drilling large-diameter wells - Google Patents

Abstract

The invention relates to a drilling technique. The goal is to increase the speed of drilling. The device includes a housing (K) 1 with an expander 2 fixed on it, a hollow rod (PN) 3 with a pilot bit 4 and a drummer 13. In the middle part the PN 3 has a thickening made in the form of a piston 5 with channels 6.7, having exit into the cavity PN 3 and to the upper and lower surfaces of the piston 5. The piston 5 is located in the cavity 9 in K 1. In the cavity 10 PN 3 there are placed a check valve 12 and a hammer 13 connected by a hinge 11 and the latter is connected to the PN 3 by a hinge 14 When pumping the flushing fluid through the cavity 10 of PN 3, the change-over valve alternately directs the fluid to Aly 6 and 7. At the same time, the striker 13 transmits to PN 3 longitudinal and transverse oscillations, and K 1 with the expander makes longitudinal displacements relative to PN 3. Pilot-chisel 4 and expander 2 rotate simultaneously under the effect of torque transmitted to PN 3 from the downhole motor shaft or drill string, destroy the rock at the bottom of a well. The oscillatory movements of the striker 13 and K 1 with the expander 2 contribute to an increase in the speed of drilling. 1 il.

Description

The invention relates to a drilling technique, namely, devices for drilling large diameter wells with a leading downhole.

The aim of the invention is to increase the rate of drilling.

The drawing shows a device for drilling large diameter wells, a general view.

The device consists of a housing 1, a dilator 2 rigidly fixed on it, a hollow rod 3 pilot bits 4. The stem B in the middle part has a thickening, made in the form of a piston 5 with channels 6 and 7, having an exit into the cavity of the stem 3 and to the top and the bottom surface of the piston 5. The hollow rod 3 is placed inside the housing 1 with the possibility of axial movement and joint rotation and is connected with it by inclined splines 8. The piston 5 is placed into the cavity 9 in the housing 1. In cavity 10 of the hollow rod 3 are located interconnected by a hinge 11, a reversing valve 12 and a striker 13. The latter is connected to the rod 3 by a hinge 14. A sleeve 15 serves to form the piston cavity. Seals 16-18 serve to form closed chambers. At the upper end of the stem 3, a thread 19 is provided to connect a downhole motor shaft or a drill string (not shown). A device for drilling wells of a large diameter works as follows.

When pumping the flushing fluid through the cavity 10 of the rod 3, the change-over valve 12 alternately directs

0

five

0

five

0

45

50

55

It emits fluid into channels 6 and 7. In this case, the striker 13 transmits to the rod 3 longitudinal and transverse oscillations, and the housing 1 with the dilator performs longitudinal movements relative to the hollow rod 3. Pilot-chisel 4 and the dilator 2 rotate simultaneously under the action of torque transmitted to the rod 3 from the downhole motor shaft or drill string destroys the rock at the well bottom. Oscillatory movements of the striker 13 and the housing 1 with the expander 2 contribute to an increase in the mechanical and regular drilling speeds.

Invention Formula

Device for drilling wells. large diameter, including a housing with a rigidly fixed on it expand the body, placed in the housing cavity. with the possibility of axial movement and joint rotation, a hollow rod with a pilot bit and a drummer, characterized in that, in order to increase the drilling rate, the rod has a thickening, made in the form of a piston located in the housing cavity, and a check valve located in its cavity while in the piston there are channels with an exit into the cavity of the rod and to the upper and lower surfaces of the piston, and the hammer is pivotally connected to the rod and the front valve and placed in the cavity of the rod, with the flip valve mounted with the possibility of alternately overlapping channels having access to the lower and upper surface of the piston.

Claims (1)

Claim Device for drilling wells. large diameter, including a housing with a rigidly fixed on it will expand the body placed in the cavity of the housing with the possibility of axial movement and joint rotation, a hollow rod with a pilot bit and hammer, characterized in that, in order to increase the drilling speed, the rod has a thickening, made in the form of a piston placed in the cavity of the body and a flip valve located in its cavity, while in the piston there are channels having access to the rod cavity and on the upper and lower surfaces of the piston, and the hammer is pivotally connected to the rod and front valve and placed in the cavity of the rod, and the flapper valve is installed with the possibility of alternately overlapping channels with access to the lower and upper surfaces of the piston.