DE202008007558U1 - Probe weight for geothermal probe - Google Patents

Abstract

probe weight for geothermal probe, wherein the probe weight at the probe foot of a geothermal probe at Introduction into a borehole, characterized in that that the probe weight (1) represents a hollow body, which with Metal scrap high bulk density filled and with a cement suspension (8) firmly in the hollow body (1) is bound.

Description

The The invention relates to a modified probe weight for a geothermal probe, whereby easy handling when inserting the probe in the Geothermiebohrung is given in comparison to the procedure according to the state of the technique.

to geothermal wells will be used economically for the economic exploitation of geothermal energy z. B. down to 150.00 m and drilled in these holes are made of plastic pipe introduced existing probes. The plastic pipe is doing generally unwound from the roll collar one can also say - reeled. As far as the probe the corresponding position in the geothermal well has reached, it is using a suitable filling material fixed and cemented.

In addition to that said that when operating a plant for the use of geothermal energy in the Piping a liquid circulates because the probes are U-shaped. In a U-thigh flows the liquid down, warms up and then rises in the other U-thigh back up. By heat exchange over then it comes to the use of geothermal energy.

It is also common To use double U probes, d. H. two U-probes will be, as in the embodiment is shown in the drawing, arranged side by side in the earth hole brought in.

The low density of the plastic pipe and the lack of liquid filling when Incorporation in the well bore usually bring difficulties with itself, because the hole is not developed, but points a rough, uneven borehole wall and thus also obstacles to the introduction the probe. Usually is therefore for the insertion of the probe into the well bore attaches a weight to the probe foot. Depending on probe size (eg whether a plastic pipe with a nominal width of 32 mm or 40 mm is used will) and the insertion depth of the probe are usually weights from 10 kg to over 50 kg used.

The Weights usually exist made of weldable Round steel with a diameter of 80 mm or 100 mm and are with a welded on mounting option provided on which the probe foot is mounted.

It is also known to use completely cast weight body.

To the current prices must be with material costs of about 0.80 EUR / kg Weight to be expected. In addition come the manufacturing costs, so that the total cost far over 1 EUR / kg weight. As the probe cemented in the hole is lost, the probe weight is lost.

It It is therefore an object of the invention to propose probe weights, the at a corresponding weight are cheaper than the weights as per stand of the technique. Using these weights, the advantage of the Easy handling of the plastic pipe when sinking preserved in the earth borehole.

According to the invention Task solved as follows, being with regard to the fundamental inventive thought up the protection claim 1 is referenced.

The Further embodiment of the invention results from the protection claims 2 to 6th

to Presentation of the invention, the following statements are made.

According to the invention, it is proposed that the probe weights consist of hollow bodies, which with Filled steel scrap are. Appropriately, should the hollow bodies made of impact resistant Material exist. Suitable hollow bodies made of steel, aluminum or Plastic.

One hollow body is preferably made of a round tube, wherein the round tube is conically formed at the lower end and thus closed. Of the Cone is for the simplified introduction of the probe expedient, deviations from the cone shape are conceivable, but must then disadvantages are accepted when introducing the probe.

Around an average high density of the probe body with filling to reach, is expediently Steel scrap with as possible small components used. It offers, for example, punched scrap at. This obtained in the stamping steel shot, which at the Producing perforated sheets arises, depending on the size of the parts the waste possibly a bulk density of 6.0 kg / liter Steel of 7.85 kg / liter. This disadvantage comes with an extension of the probe weight offset by about 30%.

Around the steel waste in the hollow body To fix and bind, this is with a cement suspension filled, d. H. the scrap parts are poured in. This cement bound Steel scrap is stuck to the hollow body after cement hardening firmly attached to each other.

It may be useful to arrange a mechanically fixed connection possibility at the bottom of the probe body to Son the weight, z. B. by screwing with another weight in addition to complain.

The in terms of handling simpler solution is in any case more cost effective compared to the known probe weights, the extension the probe weight by about 30% compared to known probe weights no disadvantage.

The Invention will now be explained with reference to an embodiment.

The Figures show a schematic representation

1 : Probe weight as hollow body with double U-probes and cement-bound steel scrap filling, longitudinal section

2 : Probe weight in plan view with double U probes

The 1 shows the probe weight 1 as a hollow body, wherein the hollow body 1 meaningfully made from a tube. At the bottom, the hollow body 1 a frustoconical finish 3 on. This truncated or conical bottom finish 3 allows easier insertion and lowering of the hollow body 1 with the U-probes 2 into the borehole. In the present embodiment is by a double-U probe 2 went out. The double U-probe 2 is on the probe foot with fastening straps 4 Mistake. The screw 6 serves for fastening the hollow body 1 on the fastening straps 4 the probe feet.

The hollow body 1 is with steel scrap 7 filled, which by a cement suspension 8th in the hollow body 1 is poured.

At the frustoconical bottom end 3 is a fixing screw 9 For attaching possibly additional weights arranged.

Out 1 and 2 it can be seen that the hollow body 1 in the upper area a square widening 5 for holding the probe feet for a double U-probe 2 has.

1

probe weight as a hollow body

2

Double U-probe

3

conical bottom finish

4

mounting tabs at the probe foot

5

square Expansion of the hollow body

6

screw for fastening the hollow body at the attachment tabs of the probes

7

steel scrap

8th

Cement suspension, hardened

9

fixing screw for additional weight

Claims (6)

Probe weight for geothermal probe, wherein the probe weight is attached to the probe foot of a geothermal probe when placed in a well bore, characterized in that the probe weight ( 1 ) represents a hollow body, which is filled with metal scrap of high bulk density and with a cement suspension ( 8th ) firmly in the hollow body ( 1 ) is bound. Probe weight according to claim 1, characterized in that the hollow body ( 1 ) with steel scrap ( 7 ) is filled with a bulk density of about 6.0 to 6.2 kg / liter. Probe weight according to claim 1, characterized in that the hollow body consists of a round tube, which in the upper region a square or rectangular in plan view widening ( 5 ) for receiving the probe foot possesses. Probe weight according to claim 1, characterized in that the hollow body has a conical or frustoconical termination ( 3 ) having. Probe weight according to claim 1, characterized that the round tube is preferably made of steel or plastic. Probe weight according to claim 1 and one or more of claims 2 to 5, characterized in that at the bottom ( 3 ) of the hollow body ( 1 ) a fixing screw ( 9 ) is arranged for an additional weight.