SU1113530A1 - Drilling string - Google Patents

Abstract

A drill bit containing a double string of drill pipes with outer and inner pipes, a rock-breaking chisel mounted on the outer pipe, an annular channel between the pipes, an ejector located on the inner pipe and connected to the annular channel, and a filter that is different in order to catch testing It is equipped with an additional ejector with a cylindrical valve, radial bridges dividing the annular channel into two channels, isolated from each other and communicating respectively with different ejectors, and a spool mechanism in the form of a shank with radial holes attached to the inner pipe under the ejector, with an axially movable spool sleeve with radial holes and an annular valve, the cylindrical valve attached to the spool sleeve, the filter is fixed on the outer pipe above the rock-breaking chisel and is made with an internal nest under the annular valve, and the lower end of the zolotoyikovoy (L sleeve is made with rock cutting tip protruding from under the top. destructive chisel.

Description

oo ate

00 Oh

FIELD OF THE INVENTION The invention relates to mining, in particular to means for. drilling and testing of aquifers.

A well-known drilling rig containing a pipe string, an ejector and a rock-breaking bit. In order to test the aquifer, a packer with a hydraulic opening mechanism (Ij.

The disadvantages of this projectile are the unreliability of the work of the packer and, as a result of the flow of fluid that results from this, distortion of the test results.

Also known is a drilling rig that assists in testing an aquifer using an airlift, which contains a double string of drill pipes with an outer and an inner pipe, a rock-breaking bit mounted on the outer pipe, an annular channel between the pipes, an ejector located on the inner pipe and communicating with the annular channel, and filter | 2).

However, in order to test the aquifer after drilling, it is necessary to perform special descending and lifting operations to install the filter inside the pipe string, which ultimately affects the performance of the work, especially when

presence of several aquifers.

The aim of the invention is to increase the testing performance.

This goal is achieved by the fact that a drill string containing a double string of drill pipes with outer and inner pipes, a rock-breaking chisel mounted on the outer pipe, an annular channel between the pipes, an ejector located on the inner pipe and communicating with the annular channel, as well as a filter, is equipped with an additional ejector with a cylindrical valve, radial bridges dividing the annular channel into two channels, isolated from each other and communicating with different ejectors, respectively, and a spool valve The mechanism in the form of a shank with radial holes and an axially movable spool sleeve with radial holes and an annular valve fixed on the inner pipe, with a cylindrical valve attached to the spool sleeve, the filter attached to the outer pipe above the rock-breaking bits and made with an internal socket under the annular valve, and the lower end of the spool bushing is made with a rock-breaking tip. com, protruding from under the end of the rock-breaking bit.

FIG. 1 shows a drill bit in a drilling position; in fig. 2 - section A-L on fng. t; in fig. 3 - drilling rig, test position.

The drilling projectile contains a column of double drill pipes 1 with inner 2 and outer 3 pipes, between which there is an annular channel 4, divided by radial jumpers 5, welded to the inner pipe and two halves of the outer pipe, into two channels 6 and 7.

o The column of double drill pipe is equipped with successively located ejectors 8 and 9. It is rigidly attached to the ejector body 9. a spool mechanism consisting of an inner shank Yu with radial holes II and a sucker sleeve 12c holes 13. The sleeve 12 has a cylindrical valve part 14 and an annular valve 15.

A filter 16 with a perforated tub 17, an internal mesh 18, and an annular valve seat 19 is rigidly attached to the outer pipe 3 at the bottom.

Under the ejector 8 in the outer pipe 3 is made a hole 20, which connects the channel

6c with an annular space 2. A rock-breaking nozzle 22 is fixed on the hub 12, and a bit 23 is connected to the filter 16. In the ejector body 9 there are radial holes 24. An annular space 25 is formed between the hub 12 and the grid 18. performed by means of shaped surfaces 26.

The work of the drilling rig is as follows.

5 During drilling (Fig. I), the flushing fluid is supplied through channel 6 to the annular space 25 and through the filter element 18 to the perforated pipe 17, enters the annulus of the well above the bit 23. Through channel 7, the washing agent is fed to ejector 8. G1pn This drill slot enters the shank 10, and from it the ejector 8 is pumped to the surface.

, When testing the studied aquifer (Fig. 3), the drilling tool is lifted above the bottom by 0.5-I m, and the flushing fluid is fed into the channel 6 through the swivel distributor, and into the channel

7- compressed air.

0 Under the pressure of the flushing fluid in the annular space 21 and due to its own weight, the sleeve 12 moves to the lower position until the annular valve 15 is seated in the socket 19 and the holes 11 and 13 are communicated. At the same time, annular space 21 from the annular space 27 (see Fig. 3), and the flushing fluid from the cannla (. of the shank 10 through the opening 24 enters the injector 9, the pumping process begins, consisting in the preliminary sticking of the filter 16 in the well and the subsequent call of the inflow from the aquifer.

Pumped liquid from the reservoir enters the annular space 28, and from it through holes II, 13 - into the shank 10. In the shank 10 due to discharge.

created by ejectors 9 and 8, the fluid is pumped out to the hyperelight.

After testing the studied interval, the drilling tool is lowered again to the bottom with simultaneous rotation and flushing, the sleeve 12 takes the upper position and the drilling process continues until the next aquifer under study.

Claims (1)

A DRILLING EQUIPMENT comprising a double drill pipe string with an outer and inner pipe, a rock cutting bit fixed to the outer pipe, an annular channel between the pipes, an ejector located on the inner pipe and communicating with the annular channel, and a filter, characterized in that in order to increase performance testing, it is equipped with an additional ejector with a cylindrical valve, radial jumpers, dividing the annular channel into two channels, isolated from each other and communicating respectively with different and ejectors and spool mechanism in the form of a shank fixed to the inner pipe under the ejector with radial holes with an axially movable spool sleeve with radial holes and an annular valve, while the cylindrical valve is mounted on the spool sleeve, the filter is mounted on the outer pipe above the rock cutting bit and is made with an internal socket under the annular valve, and the lower end of the spool sleeve is made with a rock cutting tip protruding from under the end of the rock cutting bit a.