SU1320385A1 - Core sampler - Google Patents

Abstract

The invention relates to mining and is intended for sampling while drilling oil and gas wells. The purpose of the invention is to increase drilling efficiency by circulating washing through the column pipe 1 and facilitating core recovery. For this, the pusher placed inside the pipe 1 is made in the form of a piston 2 with a chamber 3 having a concave surface 4. The chamber 3 communicates with the piston space through the holes 5 and 6. There is an overflow channel 7 in the piston2, which communicates the chamber 3 with 1: auxiliary space. In channel 7, a two-position valve 8 is installed, normally closed by a spring 9 at the inlet 10 to channel 7. On the surface 4 under the valve 8 there is placed a limiter of its movement in the form of a ball 11. The seal 2 has a seal Yupha cuff 12. When fed into pipe I the washing solution, the latter presses the valve 8, which, lowering it, pinches the ball 11. Under the entrance 10, an annular gap is formed for the passage of the solution, which through the holes 5 enters the piston chamber. To extract the core pipe 1 tilt. The ball 11 rolls out of the hole of the hole 6 and frees the space under the valve 8. When pressure is applied, the valve 8 closes the channel 7 and isolates the core from the pro; washing solution. The piston 2 moves through the pipe 1 and squeezes the core. 3 il. (L oe to o OO 00 sd

Description

The invention relates to mining deutschu, to the technical means of drilling and selection of the coffin ,. rocks predominantly loose soil.

The aim of the invention is to increase the drilling efficiency by providing pyrcic rinsing through the column tube and facilitating core recovery.

FIG. i but the sampler is shown; i-c is the running position; in fig. 2 - the same, the mode of washing when core is drilled; in fig. 3 - the same, and core extraction from the core pipe.

The column sampler contains a column pipe 1 and a pusher for extracting core, remanent inside the column pipe with the possibility of longitudinal displacement. The pusher is made in the form of n 2 with gauge 3, having a concave surface 4, which through holes 5 and 6 communicates with the porosity} of the first space. In HopiHHe 2 there is an overflow channel 7. a floating chamber 3 with an over-piston space. Channel 7 has a two-position valve 8, normally closed with a spring of 9 pa inlet 10 to channel 7.

In chamber 3, on the concave surface 4, under the clanan 8 is exchanged; with the possibility of free lateral displacement, the valve restraint in the form of Hiapa 1 is installed.

The column sampler is operating at 1m size.

Before drilling, the device is lowered into the well. At the same time, the faucet 11 occupies a neutral position on the concave surface 4 of the bottom of the non-opening channel 6, and the valve 8 is pressed by the spring 9 to the upper position. In the process of tapping into the well and at the beginning of drilling, the piston is kept from falling out of the coloic pipe with the norod-destroying tool (not indicated).

In another embodiment of the device's attachment, a float is attached to the norm, holding the nopHienb in the upper part of the core pipe in the process of its descent to the bottom. When applying to the column pipe, the washing solution of the naslediye wipes out the valve 8. which, in turn, touches the first 11 and clamps it.

five

In this position of the valve 8 (Fig. 2), under the inlet 10, a flank gap is formed for the passage of flushing fluid, which then flows through the openings 5 into the piston housing of the column. In the drilling process, the lower part of the piston rests on the core and remains at the same level and the column pipe does not move downward relative to the piston. At the end of drilling, when the piston is in the top 0 of the koloik pipe, the nodachu of the washing liquid is stopped, the valve 8 moves to the upper position (Fig. 1) and releases the ball 11. The column pipe is removed to the surface, tilted and connected via a sub to the mud pump . At the moment of inclination of the core tube, the Hiap 1 1 rolls out of the hole of the hole 6 and moves to the position shown in FIG. 3, freeing the space under the clan 8. When the pressure is applied, the clan 8 closes the channel 7 and isolates the core from proPt, f

washing fluid, with increasing pressure, the piston protrudes to move along the colo-pipe and squeezes the core. After the core has been completely removed, the core tube is disconnected from the pump and transferred to the vertical position. In this case, the ball 11 is placed in its initial position above the drainage hole, 1 in 14, and the projectile is ready to be put into the well.

Claims (1)

The invention has a core sampler containing a core tube and a pusher for extracting a core, placed inside a core pipe with a longitudinal displacement, differing in that, in order to improve drilling efficiency by ensuring circulation of the washing through the knee pipe and ensuring extraction -1I of the core, the pusher is made (as a nest with a chamber, which has a concave surface and communicates with the oppressive space, with an overflow channel, communicating with it, a chamber with a downstream with a two-inducible clan, m, orormally closed at the entrance to the channel from the above-cavity cavity with a valve non-displacement limiter in the channel, while this restrictor is made in the form of a shar, exchanged by a valve on the concave surface of the node free side 0 five displacement in ca. my.  FIG. 2