RU218405U1 - Device for secondary opening of a productive formation by drilling - Google Patents

Abstract

The utility model relates to the oil and gas industry, namely to devices used in the secondary opening of productive formations by drilling to the depth of penetration of the filtrate of drilling and cementing fluids. A device for re-opening a productive formation by drilling includes a body with a drilling unit placed in it, a drill, a drill flushing unit, mechanisms for fixing the body to the wellbore wall, a cassette with drill bushings placed in it for drilling extension, a ratchet mechanism for feeding drill bushings, a spindle, conductor and suspension of the hull in the form of a logging cable. The drill is made in the form of a hollow rod with a cutter at the end. The spindle is made with protrusions on the end, interacting with the grooves on the ends of the bushings for rotation and feed of the drill. The jig ensures the alignment of the axis of the sleeve, increasing the drill, with the axis of the drill and the spindle. The drill sleeve supply cassette is made in the form of a belt and contains sockets for inserting drill sleeves, which additionally center the axis of the drill sleeves relative to the spindle axis. EFFECT: increased reliability of the device for the secondary opening of the productive formation by drilling. 4 ill.

Description

The utility model relates to the oil and gas industry, namely to devices used in the secondary opening of productive formations by drilling to the depth of penetration of the filtrate of drilling, cementing and other process fluids polluting the formation.

State of the art

Well perforation, i.e. drilling holes in the casing string, cement ring and well walls in a predetermined depth interval is carried out for oil inflow from the reservoir into the well. The most widely used shock-explosive methods of perforation: bullet and cumulative perforation. However, with such opening methods, there is a threat of destruction of the casing string and cement stone, in addition, the depth of the perforated holes is small. This necessitated the development of more gentle non-impact opening methods, such as solid (or slotted) opening and point perforation: hydro-sandblasting and mechanical drilling.

The device for the secondary opening of the productive formation by drilling allows:

Creation of horizontal channels with a diameter of 20 mm and a length of more than 1.5 m.

The formation of an extended channel is carried out without destroying the production strings and cement stone in the annulus.

Opening a multi-column well design, i.e. secondary opening of the reservoir through the production and technical columns.

Opening of seams with a thickness of 0.5 m or more.

Creating a channel strictly at 90 degrees relative to the axis of the well.

Control by direct and indirect (graphical) method of the depth of the drilled channel. The drilling process is graphically displayed on a computer monitor.

The use of oil and oil-containing emulsion as a flushing fluid when drilling a formation, excluding the possibility of channel clogging, thereby reducing the time for the well to enter the regime.

Reservoir opening on repression, equilibrium and depression.

Establishing a connection between the oil reservoir and the casing string in new wells that have come out of drilling and in old wells that are in production.

The filtration area of one channel is equal to the filtration area of 1500 channels created using cumulative perforators of the PK-103, PK-105 types.

The creation of extended channels makes it possible to include previously unused sections of the reservoir into operation, to obtain positive dynamics in terms of hydraulic conductivity, piezoconductivity and skin factor, which leads to an increase in reservoir pressure, well flow rate, productivity factor and a decrease in water cut.

The claimed utility model is illustrated by drawings, where

figure 1 - General view of the device with a partial cut;

figure 2 - shows view a in figure 1 with a tape cassette 7 and sprockets 4;

figure 3 - shows a remote element B from figure 2 tape cassette 7 with drilling bushings 6;

figure 4 shows a section B-B from figure 3 tape cassette with bushings 6.

The device comprises a housing lowered into the wellbore on a geophysical cable, in which an electric motor 1, a fixation unit 2, a flushing pump and a drilling unit 3, a spindle 5, a tape cassette 7, drilling bushings 6, two sprockets 4 are located. The cassette is located below the drilling unit 3 and partly in it. The working end of the spindle 5, part of the cassette 7 and the jig sleeve with the next drilling sleeve 6 for moving the cutter, as well as part of the drill, are placed in the drilling unit 3 and are hermetically isolated from the rest of the device.

The device works as follows.

The device lowered into the wellbore on a logging cable to the required depth, after starting the electric motor 1 from the ground control panel (not shown in the drawings), is fixed by the locking mechanisms 2. At the same time, the pump for supplying the flushing fluid and the drilling unit 3 start working. Spindle 5, moving progressively , enters into engagement with the cutter, which first drills the casing string of the well, and then deepens into the formation. When the spindle 5 is reversed, the ratchet lever rotates the tape cassette by one step and the next drill sleeve is fed. Next, the spindle 5, with the help of a spring-loaded shank, enters into smooth engagement with the end face of the drilling sleeve 6 and screws it into the cutter. Then the cutter and the drilling sleeve 6 continue to go deep into the formation to the working length of one drilling sleeve. The process of building up a string of drill bushings 6 is repeated and continues until no drill bushing 6 remains in the tape cassette 7. The flushing fluid in the compartment is under pressure. When the spindle 5 is idling, the flushing fluid is injected into the cavity of the drill bushing string 6 directly from the compartment, and during the working one - through the connection between the ends of the protrusions of the spindle 5 and the grooves of the drill bushing 6. Excessive pressure in the compartment does not allow cuttings to penetrate into its inner zone. After not a single drill sleeve 6 remains in the cassette 7, load fluctuations during the working and idling of the spindle affect the characteristics of the current supplying the electric motor 1 and are recorded by devices located on the earth's surface. After not a single drilling sleeve remains in the cassette 7, the reverse of the electric motor 1 is turned on, the device is unlocked and removed from the well for recharging. The drill sleeve string remains in the well and serves as a conduit for formation fluid to flow.

Closest to the proposed utility model are devices for opening productive formations by drilling (RF Patent No. 98045 U1 published on September 27, 2010), including a housing, inside of which are placed the rotation and feed units of the drill, suspension of the housing in the form of a logging cable, a drill made in the form a hollow rod with a cutter (drill) at the end, a mechanism for pressing the body against the borehole wall, a cassette with drill bushings placed in it, preloaded by a spring, to build up the drill, and a flushing unit for supplying flushing fluid to the zone of destruction of the rock by the drill.

The disadvantages of the known devices is the low reliability in operation.

Significant mechanical pressure on the spindle from the side of the column of drill bushings, preloaded by the cassette spring, which led to rapid wear and breakage of the spindle and distortion and jamming of the drill bushings in the cassette.

The technical result is an increase in the reliability of the device.

A device for opening a productive formation by drilling, including a body with a drilling unit placed in it, a drill made in the form of a hollow rod with a cutter at the end, a drill flushing unit, mechanisms for fixing the body to the wellbore wall, a cassette with drill bushings placed in it for building up the drill , a spindle with protrusions on the end interacting with grooves on the ends of the bushings for rotating and feeding the drill, a jig that ensures the alignment of the axis of the bushing that builds up the drill with the axis of the drill and the spindle, as well as the suspension of the body in the form of a logging cable, characterized in that it contains a ratchet mechanism for feeding drill sleeves, and a cassette for supplying drill sleeves is made in the form of a tape and contains sockets for inserting drill sleeves, which additionally center the axis of the drill sleeves relative to the spindle axis.

The proposed solution - tape conductor, improves the reliability of the device.

Information sources:

1. Patent of the Russian Federation No. 2232873, application date 23.01.2003, published 20.07.2004.

2. Patent of the Russian Federation No. 98045 U1, application date 06/11/2010, published 09/27/2010.

Claims (1)

A device for the secondary opening of a productive formation by drilling, including a body with a drilling unit placed in it, a drill made in the form of a hollow rod with a cutter at the end, a drill flushing unit, mechanisms for fixing the body to the wellbore wall, a cassette with drill bushings placed in it for extension a drill, a spindle with protrusions on the end interacting with grooves on the ends of the bushings for rotating and feeding the drill, a jig ensuring the alignment of the axis of the bushing that builds up the drill with the axis of the drill and the spindle, as well as the suspension of the body in the form of a logging cable, characterized in that contains a ratchet mechanism for feeding drill sleeves, and the drill sleeve supply cassette is made in the form of a tape and contains slots for inserting drill sleeves, which additionally center the axis of the drill sleeves relative to the spindle axis.

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