DD269177A1

DD269177A1 - METHOD FOR PRODUCING DRILLED WATER CONTAINMENT PLANTS WITH Pouring into a line

Info

Publication number: DD269177A1
Application number: DD31087387A
Authority: DD
Inventors: Gerhard Mueller; Lothar Roesch
Original assignee: Senftenberg Braunkohle
Priority date: 1987-12-21
Filing date: 1987-12-21
Publication date: 1989-06-21

Abstract

Die Erfindung betrifft ein Verfahren zur Herstellung von gebohrten Wasserfassungsanlagen zur Abfuehrung von Waessern aus wasserfuehrenden Schichten von Lagerstaetten mit dem Ziel der Verringerung des materiell-technischen und energetischen Aufwandes. Dem erfindungsgemaessen Verfahren liegt die Aufgabe zugrunde, tiefgebohrte Wasserfassungsanlagen zu schaffen, die bei geringem Bohrdurchmesser sehr leistungsfaehig sind. Die Aufgabe wird dadurch geloest, dass Bohrungen bis zur Endteufe niedergebracht werden, diese von einer Strecke aus angefahren werden und eine UWM-Pumpe mit Ausguss in die Strecke von uebertage aus eingehangen wird. Fig. 2The invention relates to a method for the production of drilled water collection systems for the removal of water from Wasserfuehrenden layers of stores with the aim of reducing the material-technical and energy costs. The inventive method has the object to provide deep-drilled water collection systems that are very efficient at low bore diameter. The task is solved by drilled holes to the final depth, these are approached from a distance and a UWM pump with spout in the track from uebertage mounted. Fig. 2

Description

Ausführungsbeispielembodiment

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. Der in einem Gebirge mit mehreren Braunkohlenflözen 6 vorhandene Grundwasserspiegel soll abgttr.enkt werden, wobeiThe invention will be explained in more detail below using an exemplary embodiment. The existing in a mountains with several brown coal seams 6 groundwater level should be abgttr.enkt, wherein

Fig. 1: die Wasserfassungsanlage verrohrt und abgedichtet und Fig. 2: die Wasserfassungsanlage mit eingehangener UWM-Pumpe zeigt.Fig. 1: the water collection system cased and sealed and Fig. 2: shows the water collection system with mounted UWM pump.

Um diese Grundwasserabsenkung zu erreichen, werden Bohrungen bis in die gewünschte Endteufe niedergebracht. Diese Bohrungen werden im Hangend-und Liegendbereich mit Filterrohren zu Filterstrecken 1 und im Flözbereich mit Vollrohre.', ausgebaut. Im Flözbereich, zuzüglich einer Strecke von etwa 5 m in das Hangende und Liegende reichend, wird in den Ringraum zwischen Rohrlochwand und Ausbau eine stabile, festsitzende Abdichtung 2, vorzugsweise eine Zementmilchabdichtung, eingebracht. Danach werden die Bohrungen von einer untertägigen Strecke 5 aus angefahren und, wie Figur 1 dargestellt, geöffnet, so daß das darin befindliche und ständig einströmende Wasser in die Strecke 5 ausfließen kann Hat die Grundwasserabsenkung im Gebirge bzw. der Wasserspiegel in der Bohrung einen Stand erreicht, der nur wenig odor keinen freien Wasserausfluß in die Strecke 5 ergibt, wird, wie in Figur 2 dargestellt, von übertage aus eine Untei wassermotorpumpe 4, mi: vorausbestimmtem Volumenstrom und benötigter Förderhöhe sowie der Teufe entsprechenden Stt'qleitungslänge, in die Bohrung eingehangen, wobei der Steigleitungsausguß in die Strecke 5 mündet. Das geförderte Wasser fließt in einen Pumpenraum 8 an einer zentralen Stelle zu und wird von dort weiter abgefördert. Von besonder jm Vorteil sind dabei die Möglichkeiten die Bohrung sowie deren Ausbauten nur nach dem Volumenstrom des Grundv asserzuflusses in den tieferen Gebirgshorizonten bemessen zu müssen, auch wenn große Wasserzuflüsse im Bereich über der Strecke, z. B. durch Infiltration aus übertägigen Wasserbauwerken 7, zu erwarten sind. Es können Unterwassermotorpiiinpen mit geringerer Förderhöhe, kleinerem Volumenstrom und dementsprechend geringem energetischen Leistungsbedarf zum Betreiben der Anlagen eingesetzt werden. Bei gespannten tieferen Grundwasserhorizonten wird durch das aufsteigende Wasser bereits eine Vorentwässerung und Entspannung ohne energetischen Aufwand erreicht.In order to achieve this lowering of the groundwater, boreholes are drilled down to the desired final depth. These boreholes are expanded in the hanging and lying area with filter tubes to filter sections 1 and in the seam section with full tubes. In the seam area, plus a distance of about 5 m reaching into the hanging and lying end, a stable, tight seal 2, preferably a cementitious milk seal, is introduced into the annular space between the pipe-hole wall and the finish. Thereafter, the holes are approached from an underground route 5 and, as shown in Figure 1, opened, so that the therein and constantly inflowing water can flow into the route 5 Has the groundwater lowering in the mountains or the water level in the hole reached a level which gives little odor no free water discharge into the route 5, as shown in Figure 2, from above an Untei water motor pump 4 mi: predefined volume flow and required head and the depth corresponding Te'qleitungslänge, hung in the hole, wherein the riser spout opens into the route 5. The pumped water flows into a pump chamber 8 at a central location and is further discharged from there. Of particular advantage here are the possibilities of having to dimension the bore as well as its extensions only in accordance with the volume flow of the groundwater inflow in the lower mountain ranges, even if large water inflows in the area above the line, e.g. B. by infiltration of surface water structures 7, are to be expected. Submersible motor pumps with a lower delivery height, smaller volume flow and correspondingly low energy requirement can be used to operate the systems. In tense deeper groundwater horizons is already achieved by the ascending water pre-drainage and relaxation without energy expenditure.

Claims

A process for the preparation of drilled water collection systems with spout in a route, water drainage in the upper area by free drainage and using a UWM pump, characterized in that drilled holes from overground to the desired Endteufe, in Hangend- and prone area with filter tubes in the Flözbereich be expanded with full pipes, wherein in the seam area in the annulus between the borehole wall and expansion a tight seal is introduced, then the holes of t iner route are approached and opened and the water level is lowered to the line level, from above a UWM- Pump is mounted with riser, the spout opens into the route.

For this 1 page drawings

Field of application of the invention

The invention relates to a method for the production of drilled Wassorfassungsanlagen for the removal of water from the aquiferous layers of deposits in which seams are to be mined, especially in lignite mining with complicated reservoir conditions.

Characteristic of the known state of the art

For the drainage of the mountains in the territories, where the dismantling of deposits is intended, Filterbiunnen are mainly used. The water extraction from these filter wells by means of submersible motor pumps whose size and energy requirements of delivery and the required volume flow is determined. According to the size of the UWM pumps and the required well level, the parameters of the filter well, such as the diameter of the well and the nominal diameter of the wells, must be determined.

It is known that filter wells for flow rates up to 1000l / min require a clear diameter of 350mm depending on the depth and a drilling diameter of 650 to 1200 mm. For UWM pumps with a flow rate of 1000 l / min at a head of 100 m, around 4OkW of motor power is required. With a larger delivery head and larger volume flows, the power requirement increases severalfold. Through multiple pump change and arrangement of staggered well galleries is tried in practice to influence the drainage effort. It is also known that waters can be derived from the overburden by fall filter and plug-in filters drilled from a distance auö, are applicable for drainage of hanging end layers and relaxation of prone layers in the immediate vicinity of the seam. Fall filters are additional Eiitwässerungselemente with which only the lowering of water in the overburden aem seam can be supported or effected. The use of plug-in filters is limited to the immediate vicinity of the seam and serves mainly for the detection of residual water. The length of the plug filters is limited and usually does not exceed 5m. When drilling the water-bearing layers must always be expected with Sandehbrüchen. Special safety measures, such as working from 5 to 8m long route stubs and the creation of shooters in the event of any breakthroughs in the routes are required.

Object of the invention

The aim of the invention is to develop a process for the production of Geuuii .- * en Wasserfassungsanlagen with spout in a route, which reduces the material-technical and energy costs to achieve the drainage target, especially under complex reservoir conditions.

Explanation of the essence of the invention

The invention has for its object to provide deep-drilled water collection systems, which ensures a high performance of the hole at low drilling and extension diameters of the facilities. According to the invention the object is achieved in that the holes are drilled from overground to the desired end depth. These holes are removed in Hangend- and prone area with Filterrohron and Flözbereich with full pipes, wherein in the seam area in the annulus between the borehole wall and removal a tight seal is introduced. Thereafter, the holes are approached from a track, opened and lowered the water level down to the track level. As soon as only a small outflow of water is recorded, the pipe column in the stretch area is gi. opens. Thereafter, a UWM pump with riser is mounted in the tubular column from overground, the spout opens into the track.