SU1737307A1 - Device for selection of rocks and underground gas - Google Patents

Abstract

The invention relates to geochemical methods of prospecting for minerals, in particular, to devices used for sampling of rocks and samples of subsurface gas. The purpose of the invention is to combine in the single technological cycle the processes of drilling, sampling of rocks and subsurface gas. The device in the upper part consists of a thick-walled auger rod, coupled with a sliding square filter, at the bottom of which a cutting drilling tool is attached. In the upper part of the auger rod there is a sealing cuff. The lower part of the device is equipped with a sealing guide of a movable conductor with a branch pipe, on which another cuff is attached. On the lateral surface of the conductor, as well as the adapter from the rods to the gearbox of the drilling rig, there are taps 1 h. clause of f-ly 1 il sl

Description

The invention relates to geochemical methods for prospecting for minerals, in particular, devices used for sampling of rocks and samples of subsurface gas.

Closest to the present invention is the P-4 sampling device of the Urusov design. This device works in conjunction with the SUGP-10 percussion drilling rig and is mounted after lifting to the surface of the drilling tool, when the depth of the well has been reached by drilling. The main assembly of the P-4 sampler is a retractable filter with openings on the side surface. A retractable filter is mounted in a casing located at the bottom of the drill string. The lower part of the retractable filter is equipped with a pointed recess tip, which, when the entire drill string is struck, enters the soil. In the drill rods, a Kamovsky gas pump creates a vacuum from the test interval on the retractable filter and the rods comes to the surface where it is withdrawn into special containers.

The disadvantage of the Urusov plant is that, by their design features, the sampling of subsurface gas and the drilling of wells from which samples are taken are two differently and technically unbiased operations. Sampling of subsurface gas is carried out from previously drilled wells, thereby sampling are diluted with atmospheric air and cannot be tied to specified test intervals.

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The purpose of the invention is to expand the technological capabilities and improve the quality of sampling of subsoil gases.

The drawing shows the device, General view.

The device consists of a thick-walled drill string 1, in the lower part of the drill string a thick-walled floor of a screw rod 2 is attached, in the lower part of the cavity has a square cross-section, in the upper round, inside the screw rod its square cross-section combines a sliding square filter 3 with holes 4. Inside the bottom of the screw rod has protrusions 5 inward, on which the sliding square filter is held protrusions 6 outwards. The cutting boring tool 7 is attached to the lower part of the sliding square filter. A sealing cuff 8 and a sealing ring 9 are installed in the upper part of the screw rod. The screw screw is attached to the drill string with an adapter 10 with an internal bore.

The upper part of the device is equipped with a sealing guide of a movable jig 11, in the center of which the nozzle 12 is mounted in the upper part, drill rods pass through the nozzle. At the top of the nozzle, the cuff 13 is fastened with the clamping devices 14. At the top of the cuff, the clamping devices are attached to the drill string. On the side surface of the adapter 15 connecting the gearbox 16 of the drilling rig with the drill string, as well as the sealing guide of the movable conductor, taps 17 are installed, the lower part of the device having the cavity of the auger rod 18 and the lower part - the cavity 19.

The device works as follows.

The drill string 1 is connected by an adapter 15c with a gearbox 16 of a drilling rig. Next to the drill string 1 a screw rod 2 is fastened, inside which a sliding square filter 3 is mounted, cutting drilling tool 7 is installed at the end of the filter. Screw rod 2 provides for combining two operations - drill-down drilling of geochemical wells in the zone of upper geochemical sounding and sampling of rocks and subsurface gas in the drillable interval. Sealing cuff 8 contributes to the absence of atmospheric air in the annulus of the well within the studied interval. Increasing the drill rod is achieved

depth of sampling of rocks and subsoil gas is required.

Sealing guide mobile jig 11 during drilling

sets the direction of the well, retains the drill rods overhang during the run-up operations and serves to extract atmospheric air through the outlet 17 from the cavity 19, which is limited by sealing

0 by the cuff 8, the walls of the well, and the sealing guide of the movable jig 11. Removing atmospheric air from the cavity 19 is necessary to prevent it from getting out of the cavity 19 into

5 well annular space of the investigated interval. In the process of gas sampling, there is no need to create a vacuum in cavity 19, for otherwise (in the presence of vacuum in cavity 19), atmospheric

0, the air will penetrate the soil into the cavity 19. In order to extract atmospheric air from the cavity 19, the sealing guide of the movable jig 11 deepens to a depth so as to overlap

5 soil-plant layer only.

When a screw rod 2 has reached the desired interval for sampling the subsurface gas, drilling is stopped. On the nozzle 12 sealing

0 of the guiding movable jig 11, a cuff 13 is mounted with a clamping device 14 for sealing the cavity 19 enclosed between the sealing lip 8 installed in the upper part

5 auger rod 2 and a sealing guide of a movable conductor. To the tap 17 mounted on the sealing guide of the movable jig 11

0 extraction from the cavity 19 of atmospheric air.

Next, to the outlet 17 of the adapter 15, installed between the gearbox 16 of the drilling rig and the drill string 1, attach a device for extracting atmospheric air from the drill string with the filter closed. After that, raise the entire instrument to a height equal to the length of the sliding square filter 3 When

In this case, the sliding square filter 3 is opened and, in the space consisting of the sliding square filter, the cavity of the drill string 1, the subsoil gas rushes from the interval being sampled

5 sliding square filter 3 into the cavity of the drill string through tap 17 of the adapter 15. The sampling time for the subsoil gas continues until the gas concentration in the entire system is equalized, practically in the order of 10-15 minutes.

Sampling of rocks from the interval under study is made when the auger rod 2 is raised to the surface.

At the end of the sub-gas sampling, the cuff 13 is disconnected from the drill string 1, the drill string and the screw rod 2 are removed from the well,

As a result of using the proposed device, due to combining the processes of drilling and subsoil gas extraction in one technological cycle, the total time for drilling geochemical wells and testing the intervals of interest to us is significantly reduced, the quality of gas sampled (representativeness of samples) is improved. At the same time, the high accuracy of reference of the sampled subsurface gas samples to the sampling intervals is complied with, the rock and subsurface gas sampling is carried out in a single technological cycle.

Claims (2)

Claims 1. A device for sampling rocks and subsurface gas consisting of a sampler with a housing, the upper part of which is connected to a drill string, the lower part of which is made in the form of a filter, characterized in that expanding the technological capabilities and increasing the representativeness of the sample of the subsurface gas, it is equipped with a thick-walled hollow auger rod with an internal protrusion located in its lower part and a retractable filter placed inside it with upper protrusions, the inner part of a thick-walled auger rod being square in shape, and a part of the retractable square filter is equipped with a cutting drilling tool, the upper part of the auger rod is equipped with a sealing sleeve with lnymi rings, wherein the upper part of the drill string is provided with a tap adapter. 2. Device pop. 1, characterized in that it is provided with a sealing guide mounted on its upper part with a branch pipe located at its center with drill rods and a cuff with a clamping element located in its upper part, the upper part of the cuff provided with a second clamping element, and the sealing guide of the movable jig is made with a tap located in the side wall.