SU1155708A1 - Well-drilling apparatus - Google Patents

Abstract

DEVICE FOR DRILLING WELLS, including a housing, a piston with a rod, installed in the internal cavity of the housing, a working tip rigidly connected to the rod, an annular elastic jacket mounted outside the housing, the ends of which are fastened to the housing, and a hydraulic system with a reservoir for the working fluid and a pump The discharge port of which is in communication with an over-piston space, characterized in that, in order to increase the efficiency of operation, the new piston cavity is in communication with the cavity formed by an annular elastic ru head and body, and by means of a return valve - with a reservoir for the working fluid, while the hydraulic system is installed on the body.

Description

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sj 1 The invention relates to a drilling technique, and more particularly to devices for drilling wells by the method of forcing mainly large diameters. A device for drilling wells is known, which includes a housing and a working CO tip. Ground pressing when using this device occurs under the force of an explosion. The disadvantage of this device is the complexity of operation associated with the use of explosives, as well as the large metal intensity of the body, necessary to perceive the force of recoil from the explosion. The closest to the proposed technical essence and the achieved effect is a device for drilling a well, including a body, a shaft with a rod, mounted in the internal cavity of the body, a working tip rigidly connected to the rod, an annular elastic jacket mounted outside the body, the ends of which are fastened to the body m and gidrosistemus loidkosti reservoir for the working and pump discharge nozzle communicates with a koto cerned overpiston space Disadvantages of the known device - the high cost of time to release patrubochnoy cavity from the working fluid and complexity konstrukizki. The purpose of the invention is to increase the efficiency of drilling. This goal is achieved by the fact that in the well drilling device, which includes a housing, a piston with a stem, installed in the internal cavity of the housing, a working fluid is rigidly connected to the stem, JiBHHino sets an annular elastic shirt outside the housing, the ends of which are crossed with the housing , and a hydraulic system with a reservoir for the working fluid and with a pump j whose discharge pipe is in communication with the over piston space, the over piston cavity is in communication with the cavity formed by the annular elastic jacket and the body, and back valve - with a reservoir for the working fluid, while 8 2 hydraulic system is installed on the housing. The drawing shows the device, the overall appearance. The device comprises a cylindrical body 1, inside of which is mounted a piston 2 with a rod 3. With a rod, a working tip 4 is fastened with an expansion ring 5. The body 1 is fitted with an annular elastic (for example, rubber) jacket 6, which has a brace attached to the body. The jacket 6 forms an annular chamber 7 with the housing. At the upper end of the housing there is a hydraulic system including a p & fluid 8 for the working fluid, a high pressure pump 9, the discharge port of which is in communication with the over-piston space, and a 10-pump drive. The over piston space is communicated by channel 11 with an annular chamber and by means of a return valve 12 with a reservoir 8. An electric flasher 13c is placed in the reservoir with upper and lower contacts. The device works as follows. In the pre-formed borehole, the device is lowered, the reservoir B, the piston cavity and the annular chamber of which are filled with the working fluid. The drill piston 2 is in the upper position. The upper contacts of the electric signaling device 13 are closed and the green light on the control pulse is on — a signal to start the pump 10 drive. The high pressure pump 9 is turned on and the working fluid from reservoir 8 begins to flow into the annular chamber 7 and stretch the annular elastic jacket 6. At this time, the jacket 6 begins to press the walls of the well as the clearance between the pipe and the borehole is small. When the entire surface of the jacket S is in contact with the walls, the working fluid moves the fluid 2 and presses the working tip 4 with the expansion ring 5 into the soil. In the process of pressing the tip, the movement of the body 1 prevents the adhesion forces between the jacket and the wall of the well. These adhesion forces are superior to the uss of ground resistance to indentation

at the end of the tip, since the contact area between the jacket and the walls of the well is 3-3.5 times the cross-sectional area of the well.

After the working tip pushes the ground to the calculated depth and the piston takes the lowest position, the level of the tank in the tank 8 will go down and the electric indicator float 13 will close the lower contacts, and the red signal on the remote control will turn on by 5-6 turns , the backstop valve opens and the device body under the action of its weight is lowered by the stroke of the piston, the working fluid is displaced from the overpiston cavity into the reservoir 8. The device is ready for further deepening well. After the well has been formed by the projected depth, the device retrieves the 155708

c from a well with a cable (not shown. The expansion ring remains in the well when the device is lifted, due to which the lifting force is small and almost equal to the weight of the device.

The use of the device reduces the overhead of preparing for each successive pushing cycle, since the liquid from the over-piston cavity and the annular chamber 7 quickly flows into the reservoir under the action of the weight of the housing.

The reliability of the device is improved, since all the pipelines have a hydraulic a) l have a minimum length, and the elastic jacket provides

20 guaranteed adhesion to the borehole walls due to the communication of its annular chamber with the above piston space using a permanently open channel 11.

Claims (1)

A WELL DRILLING DEVICE, including a housing, a piston with a rod installed in the internal cavity of the housing, a working tip rigidly connected to the rod, an elastic ring jacket installed outside the housing, the ends of which are fastened to the housing, and a hydraulic system with a reservoir for working fluid and with a pump the pressure port of which is in communication with the over-piston space, characterized in that, in order to increase work efficiency, the over-piston cavity is in communication with the cavity formed by the annular elastic jacket and orpusom and by reverse valve - with a reservoir for hydraulic fluid, wherein the hydraulic system is installed on the housing. discharge pipe of which - 30 well lowers the device