WO2003031770A1

WO2003031770A1 - Tool for cleaning boreholes

Info

Publication number: WO2003031770A1
Application number: PCT/NL2002/000616
Authority: WO
Inventors: Johannes Sprengers
Original assignee: Johannes Sprengers
Priority date: 2001-10-08
Filing date: 2002-10-08
Publication date: 2003-04-17
Also published as: NL1019136C2

Abstract

The invention relates a tool for cleaning of bore holes for oil or gas. The tool is mounted rigid to a supply tube and is foreseen with a rotating head (2) witch bears nozzles (3) which are directed to the inner wall of the tube. In the rotating head (2) are also nozzles (5) mounted perpendicular to the rotating axis (1) and to some extent in distance to the rotating axis (1). In the stationary part are nozzles (10) placed under an angle (11) in relation with the rotating axis (1) which point out in direction of the supply tube (12). There is a eddy current brake installed as rotation control. The tool is supplied with water at a pressure between 150 to 2500 bar.

Description

TOO FOR CLEANING BOREHOLES

The invention relates a tool for cleaning of boring holes for oil and gas. The tool is mounted firm on a supply tube and is foreseen with a rotating head which is foreseen with nozzles which are directed to the inside wall of the boring hole.

Boring holes that produce oil and gas pollute in operation and on the inside wall forms a layer of sediment, mostly calcite, and disturbs the current oil or gas. Especially calcite and other calcium compounds are difficult to remove. In many cases are mechanical brushes used, however the duration of life of these appliances is short and have to replaced a number of times per boring hole.

A tool with nozzles is known from the American patent US-A-6,027,040. This tool is equipped with two nozzles which are placed eccentric and under a angle. It has been found that the combination of eccentricity and angle leads to too many revolutions per minute and results in low results. The tool dislodges the pollution in too large lumps which causes the tool easily being stuck.

The invention relates a tool with on the front side a rotating head with nozzles which are placed under an angle and in the plane of the rotating axis for an effective cleaning. The rotation of the head is accomplished by two or more nozzles which are placed perpendicular and eccentric to the rotation axis. These perpendicular to the rotation axis placed nozzles have the additional job to crush the loosened lumps so that the tool will not be stuck. In the stationary part are nozzles directed under an angle to the rearside which have the function to remove the crushed funny bits from the tool. The tool can be equipped with a eddy current brake to limit the revolutions per minute. By a selection of the diameter of the different nozzles the tool is adjusted for different types of funny bits. Calcite demands an other configuration of nozzles than hard paraffin. The tool is firm fixed to a steel supply tube and supplied with water with a pressure between 150 and 2500 bar.

Description of the invention.

Fig. 1 shows schematic the arrangement of the nozzles. Fig. 2 shows a crossection along the axis of the tool. Fig. 3 shows the cleaning operation in a boring hole.

In Fig. 1 is schematic the configuration of the nozzles indicated. Line (1) is the rotation axis of the on the front side placed rotating head (2). In head (2) are two or more nozzles (3) placed under an angle (4) in relation with the rotating axis (1) and in the plane of rotating axis (1). The angle (4) is between 25 and 50 degrees, preferable 35 degrees.

In head (2) are placed one or more nozzles (5). Nozzles (5) are placed perpendicular and with eccentricity (7). By eccentricity (7) nozzles (5) will rotate head (2). The torque can be adjusted by the choice of the diameter of the nozzle and in variation of the eccentricity (7). With (8) is the bearing and seals of the rotation coupling schematically indicated.

In the stationary part (9) are 3 to 8 nozzles (10) mounted which under an angle (11) in relation to the axis of rotation (1) pointed in direction of the supply tube (12).

In fig. 2 is shown schematic a crossection of the tool. The supply tube (12) for water with a pressure between 150 and 2500 bar is connected at (13). In the centre of the tool is channel

(14) with labyrinth seal (15). Shaft bearing and seals and eddy current brake are indicated without details with (16). In head (2) are channels (17) which connect the nozzles with channel

(14).

The tool being in the boring hole is shown in Fig. 3 with drilling tube (18) and sediment (19). The supply tube (12) which can be of the type of coiled tube serves as supply for water at high pressure. The water jets from nozzles (3) cut the sediments loose and nozzles (5) crush the funny bits and let the head (2) rotate.

Because the cleaning happens by jets of water the tool will hardly wear and it is found that boring holes can be efficient and in short time be cleaned. The configuration of the nozzles and herewith the diameter of the jets give the possibility to distribute the supplied water advantageous over the various functions.

Claims

Claims.

1. Cleaning tool which is foreseen with a rotating head with nozzles and is connected to a supply of water at high pressure to clean boring holes for oil or gas characterised in that the tool comprises of a stationary part (9) and a rotating part (2) where the rotating part (2) is foreseen with two or more nozzles (3) which are directed forward and placed under an angle (4) in relation to rotation axis (1) and herewith are one or more nozzles (5) perpendicular to and on slight distance of the rotating axis (1) and in the stationary part placed 3 or more nozzles (10)

2. Cleaning tool according to claim 1 characterised in that the forward directed nozzles (3) are placed under an angle (4) between 25 and 50 and preferable under 35 degrees in relation of the rotating axis (1) in the plane of the rotating axis (1).

3. Cleaning tool according to claim 1 and 2 characterised in that the centre line of the perpendicular to the rotating axis (1) placed nozzles (5) is situated between 1 and 10 millimetre eccentric (7) in relation to rotating axis (1).

4. Cleaning tool according to claim 1, 2 and 3 characterised in that nozzles (10) placed in stationary part (9) are placed under an angle (11) between 40 and 75 degrees backwards in relation to the rotating axis (1 ).

5. Cleaning method for boring holes for oil or gas where a cleaning tool according to claim 1 to 4 connected to a steel tube for high pressures is brought in the boring hole and supplied with water at a pressure between 150 and 2500 bar where the nozzles (3) directed to the front squirt the sediment loose and the perpendicular placed nozzles (5) crush the funny bits and have the rotating part (2) turning, by which the backwards directed nozzles (10) drive the crushed funny bits away from the tool.