DD272885B3 - DEVICE FOR SEALING THE HORIZONTAL FILTER FOR THE DRILLING AND INSTALLATION PROCESS - Google Patents

Description

embodiment The invention will be explained in more detail with reference to an embodiment and an accompanying drawing '..orden: The drawing shows a sealed standpipe 3 of the horizontal filter with a pipe section as a wellhead fuse 13, Drain slide 9, built-filter rod 11, Bohrpiloten with entrainment device 10 and drill pipe 17. In one

stable layer is just before the tense aquifer the drill hole 1 for receiving the

Spacers 2 provided standpipe 3 made. The downhole inflatable rubber tube 4 forms the conclusion of the liquid with a solidifying 7th

filled space between standpipe hole 1 and standpipe 3, which is introduced via a vertical bore 5 of the embankment 6 from. The spacers 2 allow the uniform distribution of the liquid solidifying agent. 7

After installation of the sealed standpipe 3, the discharge valve 9 is metered to the pipe socket 8 at its bottom Removal of cuttings / water and air mixture arranged. In the standpipe is using the entire length of the Drilling pilot with entrainment device 10, filter strand 11 and solid wall tube 12 installed. Subsequently, in the further extension of the standpipe 3, a piece of pipe is flanged as a wellhead lock 13,

with stuffing box 14, guide sleeve 15 and slide 16 for the passage of Bohrgostänges 17, pressure gauge 18 and

Compressed air valve 19. After introduction of the provided with a check valve 20 drill pipe 17 through the gland 14, opened Slider 16 to the non-positive connection of the Bohrpiloten with entrainment device 10 is the necessary overpressure

produced in standpipe 3, and the rotating drilling process with clear rinse begins in the pressure regime until the completion of the horizontal filter.

Claims (1)

Device for sealing the horizontal filter for the drilling and installation process in a pressure regime in which the standpipe between a sealing element at the borehole mouth and the end of the standpipe bore is sealed with a liquid solidifying agent, characterized in that the standpipe (3) has spacers (2) Lnd the solidification agent (7) via a vertical bore (5) is introduced, in extension of the standpipe (3) a piece of pipe with stuffing box (14), guide sleeve (15) and slide (16) for the passage of the drill string (17), a Pressure gauge (18) and compressed air valve (19) are mounted, wherein on the underside of the standpipe (3) a pipe socket (8) with discharge slide (9) and in the drill string (17) a check valve (20) are arranged. For this 1 page drawing Field of application of the invention The invention involves sealing the horizontal filter for the drilling and paving process in a pressure regime from the embankment of grown unconsolidated rock in open pit lignite mining operations. Further fields of application are in the industrial sectors building industry, stones and earth as well as the water economy possible. Characteristic of the known state of the art According to DD-PS 217 260 a seal of a horizontal bore through a standpipe is known which prevents collapse of the front part of the horizontal bore. Another seal is made after completion of the horizontal drilling after pulling the Standrohrea the well mouth with raw clay. This solution does not allow the horizontal hole to be sealed for drilling and installation of the horizontal filter in the pressure regime. As a result, as the depth of horizontal drilling increases, so does the pressure gradient between the atmosphere and the water-bearing layer, which has little or no stability, and constantly increasing horsepower. It comes to uncontrollable entrainment of sand particles and proper sludging of the drill string or the filter strand and thus for the timely limitation of Bohrlochstufen. Furthermore, according to DD-PS 233155 a method and an apparatus for drilling wells are known in which a casing string introduced in layers in a vertical wellbore, daboi is temporarily anchored by means of pressurized packer layer lock and fixed at final lay by a Mantolzomontierung. This solution, created for vertical drilling, also does not allow sealing a horizontal bore in the pressure regime. Object of the invention The aim of the invention is to enable a secure seal for horizontal filters, in particular for dewatering and expansion of pressurized aquifers with cost-effective effects of energy and material savings. Explanation of the essence of the invention The object of the invention is to prevent the merger of the horizontal well by maintaining the necessary pressure in the drilling up to the completion of the horizontal filter. According to the invention, the standpipe of the horizontal filter is provided with spacers via a vertical bore from the embankment with a liquid solidifying agent. The borehole mouth is closed with a sealing element known per se. At the outside of the standpipe hole outstanding part of the standpipe, a pipe socket with flanged drain valve is arranged on the underside. In extension of the standpipe a piece of pipe is mounted as a wellhead with stuffing box, guide sleeve, slide, pressure gauge and compressed air valve. The drill pipe is equipped with a check valve. The pbdichtote with liquid solidifying standpipe allows the prevention of uncontrolled pressure losses in the mountains and the inclusion of the filter string with Bohrpiloten and Vollwandrohrteil before the start of drilling the taut aquifer, which allows the passage of the drill string to the Mitnehmorteil the Bohrpiloten. The pipe section flanged to the standpipe as a wellhead seal seals the drill pipe during the borehole process by means of a stuffing box and guide sleeve with the slide open. The discharge valve occurs for the metered discharge of cuttings / water and air mixture while maintaining the necessary overpressure in function. With necessary withdrawal of the drill string, e.g. defective check valve, allows the slider in the standpipe with compressed air supply to maintain the pressure in the horizontal bore. The check valve in the drill string prevents a pressure loss during Bohrgcstängewechsel.