SU663833A1 - String of tools for drilling holes with dust suppression in annular space - Google Patents

Description

(54) FILLED FOR DRILLING WELLS WITH DUSTING IN THE FOREQUARED SPACE

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The invention relates to a technique for drilling wells, namely to staves for drilling wells with dust suppression in the annulus. Advantageously, it can be used when drilling boreholes to. quarries by roller cone drilling machines.

It is known to drill for drilling with pressure suppression in the annular space, in which the injection nozzles are led into the wall of the lower rod tube above the adapter for connecting the bit 1,

The use of such a staving allows to increase the speed of the passage on the bit up to two times, and sometimes more as compared to dust suppression of a well-air mixture at the well, since the bottom of the well remains dry, which facilitates the pneumatic port of fracture products from the bottom of the well. chisels, as well as chisel work conditions. However, during the drilling test, the nozzles often flash down, which reduces the effectiveness of dust suppression and causes a waste of time to clean them.

Also known is mouth. For drilling holes with dust suppression in the annulus, including an adapter with an annular groove, into which dust suppression nozzles 2 are led.

An annular groove is located at the lower end of the rod and leaves in the ring the target gap between the rod and the bit. This leads to the sludging of the nozzles and the ingress of water to the bottom of the well, which reduces the effectiveness of dust suppression and negates the advantages of dust suppression in the annulus.

The purpose of the invention is to increase the effectiveness of dust suppression by preventing the scrapping of nozzles and the ingress of water to the bottom.

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To achieve this goal, the annular groove is made on the side surface of the adapter.

In this case, the annular groove has a trapezoid in cross section.5 with a smaller internal base. The groove of such a forg is techno-logical to manufacture and makes it easy to place dust suppression nozzles.

In addition, at low water flow rates, the nozzles are led to the upper side of the bore and are directed at an angle to the axis of the well toward the rising air-dust flow, and at large water flows, the nozzles are drawn to the lower side of the bore and are bent at the angle of the well axis in the direction of movement rising air-dust flow,

La drawing depicts becoming for drilling wells with shalepodavleii in the annulus, the lower part.

Having become the main pipe 1 and the adapter .2 for connecting the chisel bit 3, In the main pipe 1-- there is an internal pipe 5 with gaps 4, This latch gap 4 is a channel for supplying water to the controller. nozzles 6, and the central channel 7 of the inner pipe 5 serves to supply compressed air to the well bottom. The adapter 2 is made with an annular groove 8 on its side surface, and the nozzles 6 are brought into the specified groove 8 of the adapter 2 by means of canoshes 9i

Most preferably the annular groove 8 to give a cross section of a trapezoidal shape with a smaller internal base. The nozzles b can be brought to the top, as shown in the drawing, or the bottom (not shown) of the lateral sides of the groove 8 and directed at an angle to the axis of the well toward the upwardly-air-flow velocity or in the direction of movement of this flow, respectively.

In addition, it is possible to perform staea from the injector 91 6, located both on the upper and lower sides of the annular K groove 8.

Becoming a rabsugaete is as follows.

In the course of drilling, cleaning of the bottom of the well is carried out with compressed air / entering through the central channel of the channel 7 of the inner pipe 5. Dust suppression occurs in the annular space at a distance from the bottom. Water enters the nozzles b through the gap .4 between the main 1 and internal 5 rubles and channels 9.

; With low water consumption (up to 1 o L / MIN), which occur when drilling hard rocks with low drilling speeds while drilling well wets x less hard rocks with large drilling rates, it is advisable to water in advance air-shll flow, as this will contribute to the effectiveness of dust suppression. At the same time, due to low flow, water will not flow to the bottomhole and worsen the technical and economic indicators of drilling. Such arrangement of the nozzles may be advisable even at high water flow rates, since it will contribute to an increase in the efficiency of dust suppression during the drilling of a well.

At high water consumption (more than 10 l / min), i.e. when drilling soft 5 rocks with high speeds of drilling or when drilling poorly wetted rocks, it is more expedient to feed water in the direction of the upward air-dust flow,

0 since otherwise some of the water may flow to the bottom of the well, which will lead to some decrease in the drilling rate and the bit durability.

5 In some cases, for example, when drilling watered rocks, or rocks prone to the formation of stuffing boxes, it is necessary to use significant water flow rates (250–30 l / min). In these cases, the simultaneous operation of the injectors located on both the upper and lower sides of the annular groove of the adapter is possible.

5 If the career field, where the workers work with this level, is represented by several types of rocks and when drilling in different areas both small and large ones are required.

Q water flow, it is advisable to perform with nozzles located on both sides of the groove and depending on the specific conditions of drilling leave both rows

from the injectors or temporarily muffle one of them.

The application of the proposed stave provides high efficiency of dust suppression while maintaining the drilling speed and durability of bits at the level that occurs during dry dust collection, i.e. significantly higher than with dust suppression with an air-water mixture at the well bottom.

The location of the nozzles b in the annular groove 8 on the side surface of the adapter 2 prevents the nozzles from scaling and the ingress of water to

bottom hole drilling, as well as increases the strength of the rod, since the nozzles are removed from the main pipe 1, which has a much smaller cross-sectional area than the adapter 2. Trapezoidal groove /

Formula is easy to manufacture and makes it easy to place dust suppression nozzles.

Claims (2)

The possibility of drilling with different location and number of nozzles ensures the preservation of the most favorable conditions for dust suppression and pneumatic transport of products of destruction along the well when drilling wells in various rocks with different properties. Claim 1, Becoming for drilling wells with dust suppression in the annulus, including an adapter with an annular groove, into which dust suppression nozzles are extracted, so that, in order to increase the efficiency of dust suppression by preventing the dusting of nozzles and getting water on the battlefield, ring groove made n the side surface of the adapter. 2. Becoming according to claim 1, distinguishing it with the fact that the annular groove has a trapezoidal shape in cross section with a smaller internal base. 3.Stav popp. 1 and 2, characterized in that, at low flow rates, the nozzles are brought to the upper side of the bore and directed at an angle to the axis of the well towards the air-dust flow. 4.Stav on PP. 1 and 2, characterized in that, at high flow rates, the nozzles are brought to the lower side of the bore and directed at an angle to the axis of the well in the direction of movement of the upstream air-dust flow. . Sources of information taken into account in the examination of 1, USSR Author's Certificate No. 359369, M. Class: E 21 B 9/10, 1970. 2. Authors certificate of the USSR 361280, M. class E 21 C 7/08, 1970.