RU2250343C1 - Well-drilling device - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: device has column of double drilling pipes, pilot chisel, expander with body, mounted on double drilling pipes column with possible axial displacement and combined rotation. It is provided with subs, made in form of additional double drilling pipes with outer profiled surface. Expander body is provided with spring-loaded stop for supporting subs. Expander with body is mounted with possible axial displacement and rotation by profiled connection. Expander body is provided with stabilizer. Expander and stabilizer are made detachable.

EFFECT: higher reliability.

3 cl, 1 dwg

Description

The invention relates to drilling equipment for drilling large diameter wells with direct and reverse flushing and can be used for drilling wells for water.

Known drilling rig for drilling wells by a rotary method with direct and reverse flushing [1]. The installation includes a double drill pipe string with an airlift mixer and a pilot bit with an expander.

The installation can partially reduce the cost of drilling due to bottom-hole expansion of the well, however, with negative results from subsequent testing, unproductive costs are still significant.

It is also known a device for drilling rising mines [2], including an expander mounted on the drill string and the feed mechanism of the drill string.

A disadvantage of the known device is the difficulty of transmitting torque to the expander and the inability to use backwash for drilling and testing the well.

Closest to the proposed invention is a device for drilling wells [3], including a string of double drill pipes, an extender with a housing mounted on a string of double drill pipes with the possibility of axial movement and joint rotation.

The device provides for drilling a pilot of a well with minimal costs and preliminary testing it with the subsequent expansion of the wellbore, however, when drilling a wellbore with an expander, the entire load of the drilling tool on the expander is not used, which reduces the efficiency of the device, in addition, the need to exceed the length of the expander body with the length of a double drill pipe complicates the operation of the known device.

The objective of the present invention is to increase the efficiency of the device by using the entire load of the drilling tool on the expander, as well as improving reliability by simplifying the design and operation of the device.

The problem is solved in that the device for drilling wells, including a string of double drill pipes, a pilot bit, an expander with a housing mounted on a string of double drill pipes with the possibility of axial movement and joint rotation, characterized in that it is equipped with sub, made in the form additional double drill pipes with an external profile surface, and the casing of the expander is equipped with a spring-loaded stop for supporting the sub on it, while the expander with the casing is installed with possibly Tew joint axial movement and rotation by profiled connection.

In addition, the housing of the expander is equipped with a stabilizer mounted in the upper part.

Also, the expander and stabilizer are removable.

The invention is illustrated in the drawing.

A device for drilling wells includes a pilot bit 1, double drill pipes 2 with an airlift mixer 3, an expander 4 with a housing 5 made with an internal profile surface and equipped with a spring-loaded stop 6 and a stabilizer 7.

Over the stabilizer 7 mounted weighting 8 and the thrust ring 9.

The expander 4 and the stabilizer 7 are fixed to the housing of the expander by means of couplings and are removable, of various sizes.

The device is equipped with sub 10 made in the form of additional double drill pipes (not shown in the drawing) with an external profile surface for interfacing with the internal profile surface of the casing of the expander 5.

The operation of the device for drilling wells is as follows.

A small diameter well is drilled to fully open the productive zone of the well, while the geological section of the well is refined by backwashing during drilling and preliminary testing of the well is carried out.

Based on the results of testing and establishing an updated geological section of the well, the design of the well and the required diameter of the expansion of the wellbore are determined.

The expander 4 with the appropriate stabilizer 7 is mounted on the housing 5 of the expander 4, which is installed on the string of double drill pipes 2. Moreover, the string of double drill pipes is preliminarily shortened to one section of double drill pipes.

Drilling with the expansion of the wellbore is carried out by the working stroke of the drilling tool, supported by a spring-loaded stop 6 by sub 10, using direct flushing, and if circulation is disturbed, back flushing.

After drilling for the stroke of the drilling tool, the tool is raised by the stroke value, while the reamer 4 remains on the annular face, and the double drill pipe with the lower sub is removed from the body 5 of the reamer 4 and is installed again over the spring-loaded stop 6, the rotation of the drilling tool with the extension of the shaft is turned on wells.

After performing operations on the full expansion of the wellbore, the well is flushed and the device is lifted from the well, the filter string is lowered and the well is further equipped.

Sources of information

1. Japan patent No. 2 23672, IPC E 21 V 21/00, E 21 B 17/05, 05.24.90.

2. A.S. USSR No. 1162982, IPC E 21 D 1/06, 3/00, 06.23.85.

3. Patent No. 2072047, IPC E 21 D 1/06, 1997.

Claims (3)

1. Device for drilling a well, including a string of double drill pipes, a pilot bit, an expander with a housing mounted on a string of double drill pipes with the possibility of axial movement and joint rotation, characterized in that it is equipped with sub, made in the form of additional double drill pipes with an external profile surface, and the casing of the expander is equipped with a spring-loaded stop for supporting the sub on it, while the expander with the casing is mounted with the possibility of axial movement and jointly rotation through profile communication. 2. The device according to claim 1, characterized in that the casing of the expander is equipped with a stabilizer. 3. The device according to claim 1 or 3, characterized in that the expander and stabilizer are removable.