SU941592A1 - Apparatus for drilling large-diameter wells - Google Patents

Description

(54) DEVICE FOR DRILLING WELLS BIG DIAMETER

one

The invention relates to the mechanization of construction work during the formation of trenches in rocky and permafrost soils for contact network supports and can be used for drilling large diameter wells in construction, geology, mining and oil and petroleum industries.

A well drilling device is known, which includes a base machine, a drill pipe with a drill body at the end and a screw conveyor with a drive located inside it, which provides counter-rotation of the pipe and the screw conveyor. This device is engaged in the development of soil by a chisel with subsequent transportation of it directly from the auger conveyor 15.

However, this technological scheme is applicable only for drilling soft soils, which excludes the possibility of using this device for drilling rocky 2o rocks.

The closest to the invention to the technical essence and the achieved result is a device for drilling wells, which includes a drilling tool connected to an auger column, made hollow for air supply and located in a conveying pipe, in the lower part of which slime receiving windows are located. The known device carries out the process of drilling by solid bottom with the help of a diagonal roller bit. At the same time, the cleaning of the well from the drilled sludge is carried out with compressed air into the sludge collector, with its subsequent transportation to the surface by the conveyor belt 2.

A disadvantage of the known device is the high consumption of compressed air required for transporting sludge from a large bottom area, and as a result, considerable energy consumption due to the large installation capacity of the compressor equipment.

The aim of the invention is to reduce energy consumption and compressed air consumption.

Claims (2)

This goal is achieved by having a device for drilling large-diameter wells, including a drilling tool connected to an auger, which is hollow KMiiKjH for supplying air and located in the conveying pipe, in the lower part of which there are slurry receptacles, fitted with a scraper spreader mounted on the conveying pipe, mi slits placed in front of the slam-receiving windows and the forming casing installed above the ballonsplitter, while the lower edge of the slam-receiving windows is lozhena below the level scharoschek rasschiritel. Moreover, the ball spreader and scoops are installed at an acute angle to the longitudinal axis of the device. FIG. 1 shows the proposed device; in fig. 2 shows section A-A in FIG. 1. The device includes a hollow auger column 1 driven by the drilling machine drive with a three-slotted pilot drill bit 2. A screw column together with a transporting tube 3 forms a screw conveyor. The conveyor pipe 3, which has mud-receiving windows 4, the lower edge of which enters the pilot well, is rigidly connected to the forming casing 5, the spreader 6 and the spreader 7 and is rotated by the drive of the drilling machine through the gearbox 8. The slurry from the screw conveyor is unloaded through discharge windows 9 in the upper part of the conveying pipe 3, and is loaded using podgretelly 10 and air flow from the pilot bits. The device works as follows. When rotating the auger column 1, the tricycle-gold 2 develops a pilot well, the slots from which are removed with compressed air into the cavity formed by the forming casing 5, and then along with the slit from the flapper through the slurry receptacle 4 using the directional slalom-flow and scoops 10 on the screw turns of the column 1. The ball spreader 6 is rotated through a reducer by means of a transporting tube 3 rotating in the direction opposite to the direction of rotation n The proposed device provides a more efficient loading of the screw conveyor due to the overlap of the cross section of the borehole with the forming casing 5 and the presence of scoops 10 that direct the slurry-air mixture into the slurry receiving windows 4 whose lower edge is located at or below the bottom of the expander. The use of the proposed device for the development of wells for contact network support in frozen and rocky soil eliminates the need for powerful compressors, reducing the required flow of compressed air, and reduce the energy intensity of the drilling process. Claim 1. A device for drilling wells of large diameter, including a drilling tool, connected to a screw column, made hollow for air supply and located in a transporting pipe, in the lower part of which are placed scrap-receiving windows, characterized in that, in order to reduce energy intensity and compressed air consumption, it is equipped with a scrubbing scraper installed on the conveyor pipe, scraper mills placed in front of the receiving windows and the forming casing installed above aroschechnym rasschiritelem, wherein the lower edge schlamopriemnyh windows located below the level scharoschek rasschiritel. 2. A device according to claim 1, characterized in that the scraper screed and the scoops are installed at an angle to the longitudinal axis of the device. Sources of information taken into account in the examination 1. USSR author's certificate number 347400, cl. E 02 D 17/14, 1969. 2. USSR author's certificate number 726340, cl. E-.21 D 1/06, 1978. t / g. A-A (1 / g.2