RU2317405C1 - Device for secondary productive reservoir exposing by mechanical treatment thereof - Google Patents

Abstract

FIELD: oil and gas production industry, particularly perforators and permeators.

SUBSTANCE: device comprises tubular body with drilling unit arranged therein, mechanisms for body retention on well bore wall and body suspension means. Drilling unit is adapted to rotate and supply drilling means. Body suspension means is made as logging cable. Device also has L-shaped bar arranged inside the body and including a number of plates. The plates are connected with each other through pins provided with bushes from the first bar side. The second plate sides are retained with latches. The latches may releasably connect plates with each other. Slide with drive sprockets is fastened to the first bar side. Support sprockets are secured to the second bar side. Drilling means made as chain with cutting and connection links is mounted on the support sprockets. The links are connected with each other through axes carrying rollers, which are fastened to axes ends. Rollers are in engagement with driving and support sprockets. Guiding means cooperating with bar bushes, drilling means rollers and latches are arranged in bent area of the bar.

EFFECT: increased operational efficiency.

3 cl, 3 dwg

Description

The invention relates to the oil and gas industry, in particular to devices used in the secondary opening of productive formations by machining to a depth of penetration of the filtrate of drilling, grouting and other polluting process fluids and further.

A well-known perforator drilling a well [1], comprising a cylindrical body, a body suspension in the form of a wireline cable, an oil pump, a retractable drill, a drill extension mechanism for drilling and a mechanism for fixing the perforator body to the well wall.

Its disadvantage is that due to its design features it cannot create channels of the required depth by drilling, to the depth of penetration of polluting liquids into the formation.

Closest to the proposed invention is a device for the secondary opening of the reservoir by drilling [2].

It contains a tubular body with a drilling unit located therein for rotation and supply of a drilling device, which is made in the form of a hollow rod with a cutter at the end, mechanisms for fixing the body to the wall of the wellbore, a cassette with a drill and drill sleeves placed in it for building it into drilling process, a suspension in the form of a logging cable, as well as a control unit.

The disadvantage of this device is that it cannot carry out the drilling process continuously, since it is periodically necessary to increase the drilling device as it penetrates the length of one sleeve, the difficulty of removing the drilling device from the well after drilling is completed, therefore, after drilling is completed, it is left in the channel.

The technical result is the implementation of the continuity of the drilling process, the ability to extract the drilling device from the well.

The technical result is achieved by the fact that in the device for the secondary opening of the reservoir by machining, containing a tubular body with a drilling unit located therein for rotation and supply of the drilling tool, mechanisms for fixing the body to the wall of the wellbore, the body suspension in the form of a wireline cable, is inserted case a L-shaped curved tire consisting of plates interconnected on one side by pins equipped with bushings at the ends, and on the other by latches made with the possibility of the fixing of the plates among themselves and their release, and on the one hand, a carriage with drive sprockets is attached to the tire, and on the other hand, support sprockets on which the drilling device is mounted, made in the form of a chain with planing and connecting links, interconnected by axes, on the ends of which are installed rollers that are in engagement with the drive and supporting sprockets, and guides located in the bending zone of the tire, interacting with the bushes of the tire and the rollers of the drilling device and latches.

New is that the device contains a L-shaped curved tire located in the housing, consisting of plates connected to each other by pins equipped with bushings at the ends, and on the other by latches made with the possibility of fixing the plates together and releasing them, moreover, on the one hand, a carriage with drive sprockets is attached to the tire, and on the other hand, support sprockets on which a drilling device is mounted, made in the form of a chain with planing and connecting links connected by an axle and at whose ends the rollers meshing with driving and supporting sprockets, and the guide placed in the bending zone of the tire, interact with the bushing bus and the rollers of the drilling device, and latches. The drive sprockets serve to rotate the drilling device and are kinematically connected to the drilling unit. The tire gives him a feed motion.

The claimed invention is illustrated by drawings.

Figure 1 shows the device, lowered on a wireline cable into the zone of the reservoir (schematic image), figure 2 - drilling device with a tire, figure 3 - a fragment of the chain of the drilling device.

The device comprises a housing 2 launched on a wireline 1, in which a drilling unit 3 for rotation and feeding of the drilling device 4, a washing unit (not shown in the drawings), an upper locking mechanism 5 and a lower fixing mechanism 6 of the housing are interconnected by mechanical, hydraulic and electrical systems 2 to the wall of the wellbore 7 with anchoring elements 8, an electric drive 9, an electronics unit 10, electrically connected to a system for monitoring the drilling process and recording the results on a computer (computer not shown).

The drilling device 4 is mounted on a L-shaped tire 11 (see figure 2), consisting of plates 12. On one side of the plate 12 are connected by pins 13, equipped with bushings 14 at the ends, and on the other - latches 15 mounted with the possibility of fixing plates 12 among themselves, using the groove in the plate 12, and their release. A carriage 16 is attached to the beginning of the tire 11 with drive sprockets 17 mounted on the shaft 18 and kinematically connected to the drilling unit 3 by a worm 19, the length of which is not less than the carriage stroke, and a worm wheel 20. At the opposite end of the tire 11 there are supporting sprockets 21. On the sprockets 17, 21 mounted drilling device 4, made in the form of a chain, which consists of planing links 22 and connecting links 23, interconnected by axles 24, and the rollers 25 are installed at the ends of the axles 24.

For bending the tire 11 on both sides of it are guides 26 with four grooves in each. The working surfaces of the grooves have parallel rectilinear sections parallel to each other in two mutually perpendicular directions connected by radius sections.

The working surfaces of the extreme grooves 27 interact with the rollers 25 of the drilling device, the working surfaces of the grooves 28 interact with the bushes 14 of the tire 11, the working surface of the groove 29 is designed to control the position of the latches 15. To move the carriage 16, the lead screw 30 and guide columns 31 are used.

The device operates as follows. It is lowered into the well on the logging cable 1 in the interval of the reservoir 32 and from the ground control panel to the electric motor 9 via cable 1, power is supplied, starting it up.

The rotation of the electric drive 9 is transmitted to the drilling unit 3 and then to the drive sprockets 17 kinematically associated with it and the drilling tool chain 4, and the tire 11 is also fed. Thanks to the implementation of the worm 19, the kinematic connection with the worm wheel 20 is provided with a length of at least a stroke of the carriage 16.

At the same time, the upper and lower locking mechanisms 5-6 are activated, and the anchoring elements 8, pressing against the wall of the wellbore 7, fix the device in a stationary state. At the same time, the pump for the flushing unit starts to work (the flushing unit and the pump are not shown).

The planing links 22 of the drilling tool 4 cut first into the wall of the wellbore 7 and then into the rock of the formation 32, forming a channel 33 of rectangular cross section. The feed motion is transmitted via the tire 11 from the carriage.

The working surfaces of the grooves 27-28 change the direction of movement of the tire 11 and the chain of the drilling device 4 from vertical to horizontal.

If in straight sections the chain of the drilling device 4 is adjacent to the tire 11, then in the radial section of the lower groove 29 the chain is moved a certain distance from the tire 11, forming a gap necessary for the movement of the latch 15. The working surface of the groove 29, interacting with the latch 15, translates it to the position that releases the plates 12 of the tire 11, and the tire 11 overcomes the radius portion of the working surfaces of the grooves 28. On a straight section of the working surfaces of the grooves 27-28, the latch 15 returns the groove 29 to its original position and fixes the plate 12 between at the other.

Subsequently, the latch 15 is held in this position by the chain of the drilling device 4.

After deepening the drilling device 4 into the formation 32, the reverse of the electric drive 9 is turned on to the required depth and the drilling device 4, together with the tire 11, returns to its original position and is ready for drilling the next channel.

Thus, the device allows you to conduct the drilling process continuously, to remove the drilling device from the processed channel and to obtain a channel of the required length.

Information sources

1. RF patent №2058477, ЕВВ 43/44, BI No. 11, 1996

2. Patent of the Russian Federation No. 2232873, ЕВВ 43/11, BI No. 20, 2004

Claims (3)

1. A device for the secondary opening of the reservoir by machining, including a tubular body with a drilling unit located therein for rotation and supply of the drilling tool, mechanisms for fixing the body to the wall of the wellbore, the body suspension in the form of a wireline, characterized in that it contains case a L-shaped curved tire consisting of plates interconnected on one side by pins equipped with bushings at the ends, and on the other by latches made with the possibility of fixing between them and their release, moreover, on the one hand, a carriage with drive sprockets is attached to the tire, and on the other, support sprockets on which a drilling device is mounted, made in the form of a chain with planing and connecting links connected by axes at the ends of which are mounted rollers meshed with drive and support sprockets, and guides located in the bending zone of the tire, interacting with the bushes of the tire and the rollers of the drilling device and latches. 2. The device according to claim 1, characterized in that the working surfaces of the rails are made in the form of grooves having straight and radius sections. 3. The device according to claim 1, characterized in that the drive sprockets are kinematically connected to the drilling unit.

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