SU941496A1 - Well-sinking method - Google Patents

Description

(54) METHOD FOR WELLS

one

The invention relates to methods for constructing trenchless crossings of main pipelines under water barriers, and can also be used in other branches of the national economy where trenchless pipe laying is required.

There is a known method for the formation of wells in soils, including its penetration by an autonomous reactive drilling apparatus and fixing the walls by spraying polymers from a tank, which is located in the tail section of the apparatus 1.

In this way, temporary fixation of the borehole walls with subsequent permanent casing can be obtained.

There is also known a method of drilling wells, including drilling with a drilling tool and the formation of a casing of molten plastic .2.

This method is effective for vertical wells of small diameter and length.

The aim of the invention is to increase the processability of the method by forming through horizontal and inclined wells of large extent.

This goal is achieved by following the drilling tool and pulling a metal pipe, which is removed from the well as it reaches the surface of the drilling tool, while simultaneously forming a plastic casing pipe and supporting it with water.

10 Plastic casing can be formed from thermoplastic granules, and water can be supplied from the side opposite to the course of penetration.

FIG. 1 shows the initial stage of the process of sinking under the reservoir; in fig. 2

15 the moment of completion of drilling under the bottom of the reservoir; in fig. 3 - extraction of the casing and the formation of the plastic shell; in fig. 4 shows an example of a plastic extrusion mechanism.

20 shells for carrying out the method.

Claims (2)

The device (penetrator) for drilling of wells consists of a working body 1 and an inventory protective casing made of separate successive sections 2-7, interconnected by hydraulic jacks (not shown), closed by shells 8. Inside the last section 7, there is a screw press 9, driven by an electric motor 10 by means of a planetary gear 11. The main working body of the press 9 is a screw 12 placed in a cylindrical housing 13. Around the housing 13 there is an electric heating Elements 14, insulated from the outside, with an insulating fence 15. The press 9 is provided with a pneumatic line 16 at the entrance, which passes through all sections of the tunnel and is connected to the feed station 17, and a screen filter 18, and at the exit a head 19 with an annular nozzle 20. In the head 19, electric heating elements 14 are also mounted with a thermal insulating barrier 15. The electric motor 10 and the electric heating elements 14 are connected by cables 21 to the power supply station 17. To provide the initial direction of penetration and expansion of sections in its process there is a guide frame 22 The method is carried out as follows. A guide frame 22 is installed on the bank of the reservoir under which the junction is erected. The first section 2 is installed on the guide frame 22 with the working body 1 in the bottomhole part and with hydraulic jacks at the opposite end (not shown). Pushing away with the hydraulic jacks from the winding frame 22 and developing the soil by the working body 1, section 2 is immersed in the soil massif. Then section 3 is attached to it and the process continues until section 3 is completely immersed in the soil. After that section 3 is connected through hydraulic jacks closed from soil penetration by shell 8, section 4, and the process of penetration is continued. Worker rgan 1 develops soil. Its supply and promotion of section 2 is carried out by pushing sections 2 away from sections 3, and section 3 away from section 4, etc., by means of hydraulic jacks located between the sections and protected shells 8. At the same time, the sections of the protective casing are moved in the well one after another waves, starting from section 2, by pushing each section and the previous one and pushing away from the subsequent hydraulic jacks until the working body 1 comes to the surface on the other side of the reservoir. The design radius of the penetration curvature is provided by a given curvature of the movable section 2-6. The hydraulic jacks of the sections 2-6 and the actuator 1 drive are powered from the supply station 17, which is first adjacent to the guide frame 22. After reaching the surface of the operating element 1 s section 2 disconnects them from the casing, exposes the last section 7 to the guide frame 22, and connects it to section 6; the hydraulic jacks of sections 3-7 begin to be powered from the other bank, for which the supply station is forwarded 17 and leave it there until the end of the junction structure. In addition to ensuring the operation of the hydrojacks, cables 21 and a pneumatic line 16 are connected to the supply station, through which granules of thermoplastic enter the air stream. The pellets remain inside the housing 13 of the press 9, and the air flows out through the screen filter 18, cools the electric heater 10 and exits through the protective cover to the surface. The thermoplastic granules are gripped and fed by a screw 12 of the press 9 along its body 13. Gradually squeezed under the action of the screw 12 and heated from the heat generated by the electric heating elements 14, the granules melt and turn into a viscous mass squeezed out through the annular nozzle 20 of the head 19 into the well in the form of a plastic hot shell. At the same time, from the opposite direction of penetration of the coast (from the side of the guide frame 22), water is supplied to the well, which, filling the shell, unclenches it, presses it against the walls of the well and cools, forming a solid and stable lining. As the device moves and the walls of the well, which are formed after its passage by the thermoplastic lining, are strengthened, sections 3-6 and then 7 are dismantled as they exit from the ground. A hole remains in the ground with thermoplastic-reinforced walls into which the working pipeline is then pushed. The use of the method will allow construction of pipeline trenchless passages to large distances under the bottom of reservoirs. The economic effect of introducing the method consists of reducing the metal consumption of the transition (replacing the metal case with a thermoplastic case), increasing its service life and reliability by eliminating the corrosion processes so dangerous for the metal case, reducing the environmental impact of the transition. Claim 1. Borehole drilling method, which includes drilling with a drilling tool and forming a casing pipe from molten plastic, characterized in that, in order to improve the processability of the method by allowing horizontal and inclined wells to be drilled for a long distance, a metal tool is pulled after the drilling tool a pipe that is removed from a well as it comes to the surface of a drilling tool, while simultaneously with the extraction of a pipe a plastic casing is formed u with a prop of its water. 2. A method according to claim 1, characterized in that the plastic casing is formed from thermoplastic granules, and water is supplied from the side opposite to the course of penetration. Sources of information taken into account in the examination 1. USSR author's certificate for application No. 2179106/03, cl. E 02 D 17/14, 1975. 2. USSR author's certificate No. 628735, cl. E 02 D 17/14, 1976 (prototype). tttsh  i FIG.