DD286840A5 - PROCESS FOR PURGING A TUBE - Google Patents

Abstract

The invention relates to a method for flushing a pipe in combinations with oscillations, oscillation and / or dead load for drilling wells. Pile foundations and the like. In the method according to the invention, the cuttings are brought to light in the annular space formed between the pipe and the spool rod and are led out of the pipe in the near area above the drill bit attachment point. As a result, the Foerderhoehe the discharged drilling cuttings and the Spuelfluessigkeitsdurchgang is reduced in the annular space between the pipe and soil and avoided scum in the ground. Fig. 3 {flushing; Pipe; Vibration; Oscillation; Dead load; artesian well; Pole Green Dungen; cuttings; Annulus; Spuelgestaenge; Foerderhoehe; Spuelfluessigkeitsdurchgang; Building; cratering}

Description

For this 2 pages drawings

Ai.wendungsgeblet the invention

The invention is used in the production of well bores, pile foundations and the like in the mud drilling process with the aid of vibration, oscillation and / or inertial load to overcome the wall friction between the drilling rig and the earth.

Characteristic of the known state of the art

Drilling devices are known in which by rotary motion or vibration, an outer drill pipe are sunk together with an internally mounted purge linkage in layers of soil.

The rinsing linkage is arranged centrally in the pipe and leads from the head of the drill pipe to the cutting shoe. During drilling, the rake linkage is firmly connected to the drill pipe. With simultaneous movement of Rohros by z. As vibration of the penetrating into the tube bottom is rinsed out. This can be done either via the annular space formed between the central Spülgestängo and the tube or in the reverse case by the purge linkage. The Erdstoff-Spülflüssigkeitsgemisch is at the head of the tube from the same hera is led.

(DE-OS 1433203, DS-OS1634267)

The disadvantage of these solutions is the escape of the flush in the head region of the devices. Part of the flushed soil can not take this offered path, it naturally goes the way of least resistance between outer pipe and earth.

In particular, in the case of clear water flushing, it comes to Auskolkungen and borehole enlargements, which are dependent on the soil. It comes to a filtration of the clear water rinse, which adversely affects the density increase of the drilling fluid in the annulus (outer), the drilling process and the achievable depth. After an uncontrollable discharge at the Bohriochmund pollution of the construction site by discharged soil and the flushing water.

The other part of the flushing treated with soil is brought to the surface as named at the top of the pipe, which causes a high energy consumption of the flushing pump.

Object of the invention

The invention has the goal to reduce the drilling costs and to exclude negative influences on the ground with respect to the subsequent settlements.

Essence of the invention

The invention is based on the object, in a method for flushing a pipe in combination with vibrations, oscillation and / or dead load for drilling wells, pile foundations and the like., In the interior of the pipe is a rinsing linkage and the irrigation liquid with dom cuttings in the annulus, which is formed between the pipe and the Spülgestänge comes to Tago, to reduce the Fördeihöho of boring material to be discharged and the Spülflüssigkeitsdurchgang in the annular space between the pipe and ground and thus avoid scumming in the ground and save pump energy or prevent borehole enlargements.

According to the invention, the object is achieved by the flushing liquid is led out of the tube in the vicinity of the Bohransatzpunktes. This is done via slots on the pipe, which are all open before the Bohrproztjsses and are closed immediately before entry into the soil. In a solid ground can be dispensed don on closure of the slots. The distance of the slots, which are located on vertical extension of the tube shell, is max. 2 m. The slots are closed by covers. By the invention, the Forderhöhe the discharged drilling material is reduced because the exit height of the mud is reduced. Similarly, the delivery height of the washing pump is viert and by the

Reduction of the hydrostatic pressure on the bottom of the hole, the rinsing liquid passage outside the tube in the annulus between pipe and ground limited. In addition, the filtration of rinsing liquid outside the tube decreases, and thereby a saving of rinsing liquid is achieved.

AusfOhrungsbelspiel

The invention will be explained in more detail below, the accompanying figures show

Fig. 1: Rinse rod with vibrator

Fig. 2! pipe

Fig. 3: Drilling device shown in section

Fig.4: closure plate

Fig. 5: locking means of two mandrels

(Detail x) Fig. 6: Locking of the closure plate

(Detail y).

Before the boring device is placed on the Bohransatzpunkt by hoist, it is operable to montieron. The rinsing linkage 2 (FIG. 1) with the vibrator 5 is inserted into the tube 1 (FIG. 2) and locked, the slits 4 are opened by removing the closure plates 8. Now, one or more pressure hoses are connected, through which pumps the rinsing liquid, which can be removed from water bodies, wells, storage tanks, etc., conveyed into the rinsing linkage 2.

During the drilling process, the flushing liquid exits under pressure at the bottom of the scavenging linkage and, with the aid of the vibration introduced into the structure by the vibrators 5, releases the soil within the tube 1, which by virtue of the vibration advances the scavenging linkage into the earth is driven. The length of the pre-cut is dependent on the distance outlet Spülge3tänge 2 to the cutting shoe 7 and can be made variable.

The dissolved soil is transported through the annulus 6 between rinse pipe 2 and pipe 1 through the mud to the first slot 4 and exits during downhill drilling at a decreasing height above the drill land.

Via a collecting device, the flushing liquid mixed with soil can be collected, discharged and reused after the sedimentation of the soil.

If the first slot 1 is sunk to the ground, the purge current and the vibration are temporarily interrupted and the slot 4 is closed with a sheet 8. After switching on the flushing flow and the vibration, a further sinking of the device takes place until the next slot 1, through which the flushing flow now emerges, is closed off before sinking under ground (FIG. 3). This process is repeated until the final drop.

In stable cohesive soil can be dispensed with the closing of the slots 1.

After releasing the locking of the Spülgestänges 2 on the pipe 1, it is pulled out of the tube 1. The tube 1 is fitted with internals,

z. B. for wells or foundation bodies provided. Subsequently, the tube is pulled out of the earth and the closure plates 8 dismantled.

After installing the Spülgostänges 2, the device is ready for use again.

The drilling device consists of a tube 1 provided with elongate rectangular closable outlet slots 4, at the lower end of which a cutting shoe 7 is inserted. In this provided with slots 4 tube 1 a rinsing linkage 2 is inserted and connected to the tube 1 by locking each other.

The distance of the slots 4, which are located on the vertical extension of the tube 1, is a maximum of 2m.

The closure plate 8 (Fig. 4) of the slots 4 is inserted with the spikes 9 (Fig. 5) into existing holes in the tube 1 and folded down. Through the mandrels 9 Vurschlußbloch 8 is locked on all sides. At the other end of the Verschlußbleclies 8 a lock (Fig. 6) is mounted, which secures the closure plate 8 here and consists of an outer Riegol 10 and an inner latch 11. Both bars are connected by a rectangular web 12 with each other. In a slot 13, the connecting plate 12 is guided during opening and closing of the lock. The outer latch 10 allows by its length a stop possibility when closing the slot 4 through the closure plate 8. The locking device can be secured by screws or cotter pins against unintentional opening. During or after pulling the tube 1 from the ground, the closure plates 8 can be removed by Löson the lock.

At the upper end of the Spülgestänges 2 are the connections for the supply of the rinsing liquid and two synchronized counter-rotating vibrators. About the vibrators a lifting lug is arranged. At the lower end of the Spülgestanges 2 spacers 3 are mounted for centering. The bufindlichen in the earth by the sinking of the device slots 4 are closed by closure plates 8.

The special applications of the invention relates to the production of wells and foundation bodies up to a depth of 15m, preferably mobile hoists are used.

By the given !, Austrinsweg the soil-promoting rinsing liquid, the outlet height of the rinsing liquid is horabgosetzt and reduces the FörderI .öhe the rinsing pump, the Spülflüssigkeitsdurchgang outside the tube in the king space between the earth and tube 1 almost impossible and the Bohrhrgeschwindigkeitsvermindernde hydrostatic pressure on the bottom hole by avoiding suspended state of the excavated earth.

In addition, the filtration of the washing liquid in the area of the bottom hole and outside of the tube is reduced.

It is achieved a saving of the rinsing liquid.

Claims (4)

1. A method for flushing a pipe in combination with oscillations, oscillation and / or dead load for drilling wells, pile foundations and the like., In the interior of the pipe is a Spülgestänge with spacers and the flushing liquid with the Bohrgui in the annulus between the pipe and the rinsing linkage is brought to light, characterized in that the rinsing fluid and cuttings are led out of the tube in the near area above the Bohransatzpunktes. 2. The method according to claim 1, characterized in that the rinsing liquid and the cuttings are led out via slots (4) on the tube. 3. The method according to claim 2, characterized in that the slots (4) are closed before entering soil with closure plates. 4. The method according to claim 1, characterized in that the area above the Bohransatzpunktes within the limits of 0 to 2 m.