Device for drilling side boreholes from cased well

FIELD: drilling equipment, particularly for deflecting the direction of boreholes.

SUBSTANCE: device includes deflecting wedge with fastening mechanism made as corrugated tube with one sealed end and sub disposed between deflecting wedge and fastening mechanism. Device also has channel to supply fluid into corrugated tube, movable joint between sub and wedge and cutting tool. Device also comprises holding unit for deflecting wedge installed in the sub and made as a piston with rod and fixing means arranged in hydraulic cylinder. Hydraulic cylinder interior communicates with that of corrugated tube. Upper rod part is installed to cooperate with lower part of the wedge from guiding plane side. Channel for flushing fluid supplying is made as hydraulic line connecting drill pipe interior and that of cutting tool with corrugated tube interior, wherein the cutting tool is secured to upper part of deflecting wedge by means of shear bolt.

EFFECT: increased rigidity of deflecting wedge fixation in casing pipe of the well.

3 cl, 2 dwg

 

The invention relates to the field of drilling for oil and gas wells, in particular, to devices for sidetracking from cased wells.

The known device for sidetracking from wells, which includes the initial milling cutter mounted on the deflecting wedge or shear bolts, or using an isolator and associated with fixing mechanism made either in the form of a telescopic pipe or in the form of an anchor (A.S. 180540, IPC E 21, op. 26.03.66, and U.S. Pat. 2180388, IPC 7 E 21, op. 10.03.02 year).

Known devices do not provide a snug fit of the upper part of the wedge to the wall of the casing, which makes the drilling of a sidetrack in the column and, subsequently, the passage of equipment in the side of the trunk.

In addition, known devices do not provide a reliable fastening of the deflecting wedge in the casing, with the result of its vertical offset in further operations in the well.

A device for sidetracking from wells, comprising a deflecting wedge set using the sub on fixing mechanism made in the form of longitudinally-corrugated pipe. Connection deflecting wedge with fixing the hinge mechanism is made using an axis fixed in the sub. In addition, the sub made streaming channel, Paul tells the STI casing and longitudinally-corrugated pipe with a hollow drill pipe (U.S. Pat. 2164282, IPC 7 E 21 In 7/08, op. 20.03.01,).

The known device due to the special form of the securing mechanism in the form of a longitudinally-corrugated pipe ensures reliable installation of the wedge in the casing, but there is no rigid fixation deflecting wedge relative to the fixing mechanism that makes possible the movement of the wedge in the horizontal plane around the axis and overlapping wellbore. In addition, after installation of the known device is necessary to repeat the descent of the drill string with a cutting tool for cutting a “window” in a casing, which increases the technology of drilling additional trunks.

Thus arose the problem of creating a device for a second wellbore of the well to ensure reliable and stable operation in his descent, and to consolidate in the well with the lowest material costs.

The technical result - rigid fixation deflecting wedge in the well casing string.

This technical result is achieved by the fact that the known device for sidetracking from wells, comprising a deflecting wedge with fixing mechanism in the form of a corrugated pipe, one end of which is plugged between which is placed the sub channel for the fluid in the cavity of garyowen the second pipe, flexible connection between the sub and the wedge, cutting tool, according to the invention further comprises the fixing unit deflecting wedge installed in the sub and made in the form of piston and rod, and a locking device placed in the cylinder, the cavity of which communicates with the cavity of the corrugated pipe, the upper part of the stem mounted for engagement with the lower part of the wedge against the side guide plane, and the channel for the fluid made in the form housed in a deflecting wedge of gidroprovod connecting the cavity of the drill pipe and the cavity cutting tool attached to the upper part of the deflecting wedge by means of shear bolts, corrugated cavity pipe.

The cutting tool can be made in the form of a milling cutter window and Fraser widening.

The rod may be equipped with a locking device made in the form of cutting, interacting with annular springs installed in the cylinder.

The location of the fixing unit deflecting wedge, made in the form of a piston and rod, and a locking device placed in the cylinder, in the sub interoperable rod with the lower part of the deflecting wedge against the side guide plane provides the opportunity during setup and device in the casing string to create additional support for the wedge and firmly fix it in position tight fit against the inner wall of the casing string.

The execution channel for the fluid in the form of gidroprovod reporting cavity drill pipe and the cutting tool with the cavity of the corrugated pipe connected with the cylinder, simultaneously with fusing composition in the well to exercise and rigid fixation of deflecting wedge.

The comparison of the proposed device with the prototype revealed the presence of a new element in the device of the fixing unit deflecting wedge, a new form of execution known element, a channel for the fluid in the form of gidroprovod, as well as new relationships between these elements, which indicates the consistency of the proposed technical solutions to the criterion “novelty”.

Search for distinctive signs revealed a device for whipstock (A.S. 1564319 IPC 5 E 21 In 7/08, op. 15.05.90,), comprising a housing with a piston and rod and the fixing unit, made in the form of a sleeve and retainer in a radial hole of the sleeve. The known device is intended for installation deflecting wedge, it is placed over the wedge, fix it upper part of the wedge and put the layout in the hole. Set the whipstock to the desired position and carry out the separation of the wedge from the device by feeding washing liquid. Thus, the purpose of the above device - set wedge, after which it eliminate the STV is removed from the well.

We offer the fixing unit, placed in the sub under the deflecting wedge and forming an integral part of the composition, is another function - creates additional support for the wedge and presses it against the borehole wall during the entire period of operation in the lateral wellbore. Thus, the invention allows to achieve a new technical result.

Also was revealed the whipstock downhole motor (A.S. 1640327, IPC 5 E 21 In 7/08, op. 07.04.91 g)containing a hydraulic cylinder with a spring-loaded piston and rod are accommodated in the housing of two sections, bearing, connecting the two sections and the locking elements. The purpose of the hydraulic cylinder with a piston and rod in this device is to turn one section relative to another on the bearing when the supply of washing fluid.

We offer the fixing unit, consisting also of a hydraulic cylinder with a piston and rod installation (fixing) elements, thanks to its new location in the sub proposed layout and new relations with the deflecting wedge, enables the achievement of a new technical result - the creation of additional support for the wedge and, as a consequence, reliable pressing of it to the borehole wall during the entire period of operation in the lateral shaft.

Thus, the analysis above demonstrates compliance featur is imago technical solutions to the criterion of “inventive step”.

Figure 1 shows a General view of the device, figure 2 - sub with the fixing unit.

The proposed device comprises a deflecting wedge 1 with the guide plane 2, which is connected through the sub with 3 fixing mechanism made in the form of a corrugated tube 4. Between sub 3 and the deflecting wedge 1 posted by flexible connection in the form of a hinge 5 with the axis. In the upper part of the deflecting wedge set cutting tools - milling the window 6 on shear bolt 7 and the mill extends 8 associated with drill pipe 9. Gidroprovod 10 connects the cavity of the drill pipe 9 and the cutting tools 6, 8 with the cavity of the corrugated pipe 4 and serves to supply fluid. The fixing unit (2) includes a cylinder 11 in which is placed a piston 12 and rod 13. The rod 13 is equipped with the locking device, made in the form of cutting 14 communicating with the annular spring 15, the tip 16 of the rod 13 rests on the lower part of the deflecting wedge 1 by guiding his plane 2. The hydraulic cylinder 11 communicates with the cavity of the corrugated pipe 4 channel 17.

The device operates as follows.

Gathered on the jetty drilling proposed layout lowered on drill pipe to a predetermined depth and the pump creates a pressure fluid to full disclosure of the corrugated pipe. The fluid from the drill truby through the mill 6 and 8 and hydrobromide 10 enters the cavity of the corrugated pipe 4. When the corrugated pipe is expanded to compress its walls to the casing (not shown). Simultaneously, the rod 13 with the piston 12 under the action of fluid pressure trapped in the channel 17 of the cavity of the corrugated tube 4 is moved upward, resting its tip 16 in the end portion of the deflecting wedge 1, and rotate it around the axis 5, so that it pressed against the wall of the casing. In the upper position of the rod 13 is fixed annular spring 15. Then tension the drill pipe string 9 check the reliability of the installation layout in the well. If a positive test tension tool shall cut screws and detach the window of a router from the wedge. Next, the well is washed, the cutters 6 and 8 gives the rotation and start milling a window in the casing string and the drilling of a sidetrack.

The proposed device allows for one flight to make the descent deflecting wedge, secure its fastening at the specified depth simultaneously with rigid fixation deflecting wedge, cutting open, and the drilling of a sidetrack, which ultimately improves the quality of work, reduce the accident rate and cost of material cost of sidetracking the well.

1. Device for the second wellbore from a cased wellbore, comprising deflecting wedge with a pinning mechanism in VI is e of the corrugated pipe, one end is plugged, between which is placed the sub channel for the fluid in the cavity of the corrugated pipe, flexible connection between the sub and the wedge, cutting tool, characterized in that it further comprises the fixing unit deflecting wedge installed in the sub and made in the form of piston and rod, and a locking device placed in the cylinder, the cavity of which communicates with the cavity of the corrugated pipe, the upper part of the stem mounted for engagement with the lower part of the wedge against the side guide plane, and the channel for the fluid made in the form housed in a deflecting wedge of gidroprovod, connecting the cavity of the drill pipe and the cavity cutting tool attached to the upper part of the deflecting wedge through shear bolt, with the cavity of the corrugated pipe.

2. The device according to claim 1, characterized in that the cutting tool is made in the form of a milling cutter window and Fraser widening.

3. The device according to claim 1, characterized in that the rod is equipped with a locking device made in the form of cutting, interacting with annular springs installed in the cylinder.



 

Same patents:

FIELD: oil and gas well drilling equipment with the use of hydraulic downhole motors.

SUBSTANCE: support-and-centering member is made as metal hub with blades connected to spindle connector. Spindle connector has support cone formed on outer surface thereof and adapted to provide rigid connection with metal hub from inner surface thereof. Support cone of the connector is formed from side of conical thread connecting spindle body with connector. Spindle connector has splines to connect thereof with metal hub. Metal hub is pressed with pressing cone, retaining washer and nut from another side thereof. Metal hub may be installed concentrically or eccentrically to spindle connector axis or outer surface thereof may be differently shaped and arranged eccentrically, concentrically or obliquely with respect to spindle connector axis.

EFFECT: reduced costs of spindle usage.

5 dwg

FIELD: drilling equipment, particularly for directional drilling, namely control devices adapted to control angle and reactive moment.

SUBSTANCE: control device has hollow central member and three hollow tubular noncoaxial members connected to hollow central member. Inner member is disposed in center between the first and the second members. The first and the second members are connected with inner members by threaded connection. The first member is connected to spindle by threaded coupling, the second member is attached to engine body by threaded coupling and central member is connected to inner member by spline. Each of central member and the first member are provided with sectional contact seats located from spindle connection side, wherein a pair of sectional contact seats arranged from either sides of meridional spindle plane in drilling string curvature plane are defined between central and the first members. Sectional contact seats defined between central and the first members are spaced a distance L from the nearest edges of sectional contact seats of central and the first members along central axis of the first member. The distance L is more or equal to spindle diameter D. Angular deviation of the sectional contact seat formed in the first member from meridian spindle plane in drilling string curvature plane is oppositely directed relative reactive drilling bit moment.

EFFECT: increased stability and angle of gerotor engine deflection and increased accuracy of non-uniform well bottom zone penetration.

2 cl, 10 dwg

FIELD: oil production, particularly for drilling oil and gas well cluster.

SUBSTANCE: method involves lowering pipe string into casing pipe, wherein pipe string has deflector connected to one end thereof; opening-out casing pipe within the necessary range; alternately lowering flexible tube having nozzle in pipe string up to reaching opened-out casing pipe area under the action of the deflector; supplying high-pressure liquid through flexible tube having nozzle simultaneously with translation thereof for necessary length to form additional well bores; initial removing flexible tube from pipe string and turning pipe string with deflector through necessary angle to obtain required number of additional well bores; final removing flexible pipe with nozzle out of casing pipe. The casing pipe is opened-out over the full diameter thereof within the necessary range and after casing pipe opening deflector is installed in opened area. After additional well bore forming and before pipe string with deflector rotation flexible tube with nozzle is removed from opened-out area of casing pipe.

EFFECT: reduced number of round-trip operations for well cluster forming under the action of liquid head and, as a result, reduced costs.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has body, provided with anchor, lowered on pipes to given depth, having guide and ring-shaped compaction of hydro-drive, and also made with possible displacement inside pipes and body by displacement means, hydraulic engine, passing through compaction, hollow of which is connected to destroying tool hollow, consisting of flexible shaft, provided with destroying head. Device also has tool for destroying casing column and tool for destroying rock, while hydro-drive consists of hollow leading and following shafts, made with possible rotation and longitudinal movement of the latter inside leading shaft until mounting in socket of leading shaft, forming non-pressurized couple cylinder-piston, while torque from leading shaft to following shaft is passed via ratchet gear, body has hydraulic channel, connecting guide hollow to ring-shaped well space, while on the side, opposite to output aperture of guide hydraulic deflector of piston-cylinder type is mounted on it, and in upper portion of body a cylindrical recess is present, made with possible hermetic mounting of leading shaft with rotation, while outside the body an anchor is mounted, being in threaded connection to sub connected to body, and engine is made with possible hermetic mounting in ring-shaped compaction, mounted above recess in body at a distance, lesser than total length of engine and leading shaft, while on the inner surface of body a stop is mounted made with possible interaction with shelves on outer surface of engine body. For making perforation channels in abrasive rocks rock-destroying tool is used, consisting of flexible shaft and chisel. As movement means flexible pipes are used, hollow of which connects to engine hollow.

EFFECT: higher reliability, higher efficiency.

7 cl, 5 dwg

Drilling tool // 2246603

FIELD: mining industry.

SUBSTANCE: drilling toll has body with thread and inner washing channel, as well as matrix, contacting pin by its inner surface and having outer end spherical surface, provided with rock-destroying means. Pin in body is mounted coaxially. Outer end spherical surface of matrix with rock-destroying means is made with diameter equal to outer diameter of drilling toll, and inner surface of matrix and outer surface of pin are made spherical, centers of which coincide with center of outer end spherical surface of matrix. Between inner surface of matrix and spherical pin, balls are mounted in recesses of contact surfaces. Recesses for balls made in matrix are elongated in vertical directions from ball center for distance L=(R+r)tgΨ, where R - radius of pin spherical outer surface, m; r - ball radius, m; Ψ - maximally possible angle of matrix rotation in vertical plane, in degrees.

EFFECT: higher reliability.

6 dwg

FIELD: drilling equipment.

SUBSTANCE: device has body, shaft, mounted in body on bearings, drive made in form of hollow spring-loaded rod with outer slits, movement converter made in form of outer bushing with spiral grooves, interacting with response shelves of inner hollow bushing, piston with compaction, spring-loaded ring, provided with slits and toothed half-sleeve. Outer bushing of movement converter is connected to body, and inner one is connected to piston and provided with toothed half-sleeve, interacting with toothed half-sleeve of spring-loaded rod. Rod spring is supported by body via stop ball bearing. Spring-loaded ring, interacting to response half-sleeve of shaft by toothed half-sleeve, is engaged with body by slits.

EFFECT: higher reliability.

5 dwg

FIELD: mining industry.

SUBSTANCE: device has two bodies, laced between drilling pipes and rock-destroying element, drilling assembly changing assembly, mounted between bodies. Bodies are placed at a space between each other and interconnected moveably by drill angle changing assembly, made in form of bushing, inside of which a rubber bushing is placed, passing through inner hollows of bodies. Rubber bushing is provided with compacting element and elements for excluding its deformation. Value of space is selected from condition providing for drilling along planned trajectory, providing for exit from slanting portion into horizontal. Elements for excluding deformation of rubber bushing are made in form of steel rings. Fixing elements are made in form of two pairs of coaxial stops in lower and upper bodies respectively at angle of 90° to each other.

EFFECT: higher productiveness.

2 cl, 1 ex, 1 dwg

The invention relates to the drilling of oil wells and is directed to the solution of operational management and control of drilling directional wells

The invention relates to the field of drilling inclined and horizontal wells, namely, the technical means for the directional curvature of the wellbore during rotary drilling method

FIELD: mining industry.

SUBSTANCE: device has two bodies, laced between drilling pipes and rock-destroying element, drilling assembly changing assembly, mounted between bodies. Bodies are placed at a space between each other and interconnected moveably by drill angle changing assembly, made in form of bushing, inside of which a rubber bushing is placed, passing through inner hollows of bodies. Rubber bushing is provided with compacting element and elements for excluding its deformation. Value of space is selected from condition providing for drilling along planned trajectory, providing for exit from slanting portion into horizontal. Elements for excluding deformation of rubber bushing are made in form of steel rings. Fixing elements are made in form of two pairs of coaxial stops in lower and upper bodies respectively at angle of 90° to each other.

EFFECT: higher productiveness.

2 cl, 1 ex, 1 dwg

FIELD: drilling equipment.

SUBSTANCE: device has body, shaft, mounted in body on bearings, drive made in form of hollow spring-loaded rod with outer slits, movement converter made in form of outer bushing with spiral grooves, interacting with response shelves of inner hollow bushing, piston with compaction, spring-loaded ring, provided with slits and toothed half-sleeve. Outer bushing of movement converter is connected to body, and inner one is connected to piston and provided with toothed half-sleeve, interacting with toothed half-sleeve of spring-loaded rod. Rod spring is supported by body via stop ball bearing. Spring-loaded ring, interacting to response half-sleeve of shaft by toothed half-sleeve, is engaged with body by slits.

EFFECT: higher reliability.

5 dwg

Drilling tool // 2246603

FIELD: mining industry.

SUBSTANCE: drilling toll has body with thread and inner washing channel, as well as matrix, contacting pin by its inner surface and having outer end spherical surface, provided with rock-destroying means. Pin in body is mounted coaxially. Outer end spherical surface of matrix with rock-destroying means is made with diameter equal to outer diameter of drilling toll, and inner surface of matrix and outer surface of pin are made spherical, centers of which coincide with center of outer end spherical surface of matrix. Between inner surface of matrix and spherical pin, balls are mounted in recesses of contact surfaces. Recesses for balls made in matrix are elongated in vertical directions from ball center for distance L=(R+r)tgΨ, where R - radius of pin spherical outer surface, m; r - ball radius, m; Ψ - maximally possible angle of matrix rotation in vertical plane, in degrees.

EFFECT: higher reliability.

6 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has body, provided with anchor, lowered on pipes to given depth, having guide and ring-shaped compaction of hydro-drive, and also made with possible displacement inside pipes and body by displacement means, hydraulic engine, passing through compaction, hollow of which is connected to destroying tool hollow, consisting of flexible shaft, provided with destroying head. Device also has tool for destroying casing column and tool for destroying rock, while hydro-drive consists of hollow leading and following shafts, made with possible rotation and longitudinal movement of the latter inside leading shaft until mounting in socket of leading shaft, forming non-pressurized couple cylinder-piston, while torque from leading shaft to following shaft is passed via ratchet gear, body has hydraulic channel, connecting guide hollow to ring-shaped well space, while on the side, opposite to output aperture of guide hydraulic deflector of piston-cylinder type is mounted on it, and in upper portion of body a cylindrical recess is present, made with possible hermetic mounting of leading shaft with rotation, while outside the body an anchor is mounted, being in threaded connection to sub connected to body, and engine is made with possible hermetic mounting in ring-shaped compaction, mounted above recess in body at a distance, lesser than total length of engine and leading shaft, while on the inner surface of body a stop is mounted made with possible interaction with shelves on outer surface of engine body. For making perforation channels in abrasive rocks rock-destroying tool is used, consisting of flexible shaft and chisel. As movement means flexible pipes are used, hollow of which connects to engine hollow.

EFFECT: higher reliability, higher efficiency.

7 cl, 5 dwg

FIELD: oil production, particularly for drilling oil and gas well cluster.

SUBSTANCE: method involves lowering pipe string into casing pipe, wherein pipe string has deflector connected to one end thereof; opening-out casing pipe within the necessary range; alternately lowering flexible tube having nozzle in pipe string up to reaching opened-out casing pipe area under the action of the deflector; supplying high-pressure liquid through flexible tube having nozzle simultaneously with translation thereof for necessary length to form additional well bores; initial removing flexible tube from pipe string and turning pipe string with deflector through necessary angle to obtain required number of additional well bores; final removing flexible pipe with nozzle out of casing pipe. The casing pipe is opened-out over the full diameter thereof within the necessary range and after casing pipe opening deflector is installed in opened area. After additional well bore forming and before pipe string with deflector rotation flexible tube with nozzle is removed from opened-out area of casing pipe.

EFFECT: reduced number of round-trip operations for well cluster forming under the action of liquid head and, as a result, reduced costs.

1 dwg

FIELD: drilling equipment, particularly for directional drilling, namely control devices adapted to control angle and reactive moment.

SUBSTANCE: control device has hollow central member and three hollow tubular noncoaxial members connected to hollow central member. Inner member is disposed in center between the first and the second members. The first and the second members are connected with inner members by threaded connection. The first member is connected to spindle by threaded coupling, the second member is attached to engine body by threaded coupling and central member is connected to inner member by spline. Each of central member and the first member are provided with sectional contact seats located from spindle connection side, wherein a pair of sectional contact seats arranged from either sides of meridional spindle plane in drilling string curvature plane are defined between central and the first members. Sectional contact seats defined between central and the first members are spaced a distance L from the nearest edges of sectional contact seats of central and the first members along central axis of the first member. The distance L is more or equal to spindle diameter D. Angular deviation of the sectional contact seat formed in the first member from meridian spindle plane in drilling string curvature plane is oppositely directed relative reactive drilling bit moment.

EFFECT: increased stability and angle of gerotor engine deflection and increased accuracy of non-uniform well bottom zone penetration.

2 cl, 10 dwg

FIELD: oil and gas well drilling equipment with the use of hydraulic downhole motors.

SUBSTANCE: support-and-centering member is made as metal hub with blades connected to spindle connector. Spindle connector has support cone formed on outer surface thereof and adapted to provide rigid connection with metal hub from inner surface thereof. Support cone of the connector is formed from side of conical thread connecting spindle body with connector. Spindle connector has splines to connect thereof with metal hub. Metal hub is pressed with pressing cone, retaining washer and nut from another side thereof. Metal hub may be installed concentrically or eccentrically to spindle connector axis or outer surface thereof may be differently shaped and arranged eccentrically, concentrically or obliquely with respect to spindle connector axis.

EFFECT: reduced costs of spindle usage.

5 dwg

FIELD: drilling equipment, particularly for deflecting the direction of boreholes.

SUBSTANCE: device includes deflecting wedge with fastening mechanism made as corrugated tube with one sealed end and sub disposed between deflecting wedge and fastening mechanism. Device also has channel to supply fluid into corrugated tube, movable joint between sub and wedge and cutting tool. Device also comprises holding unit for deflecting wedge installed in the sub and made as a piston with rod and fixing means arranged in hydraulic cylinder. Hydraulic cylinder interior communicates with that of corrugated tube. Upper rod part is installed to cooperate with lower part of the wedge from guiding plane side. Channel for flushing fluid supplying is made as hydraulic line connecting drill pipe interior and that of cutting tool with corrugated tube interior, wherein the cutting tool is secured to upper part of deflecting wedge by means of shear bolt.

EFFECT: increased rigidity of deflecting wedge fixation in casing pipe of the well.

3 cl, 2 dwg

FIELD: well construction, particularly to built cluster wells.

SUBSTANCE: method involves lowering pipe string provided with deflector on end thereof in casing pipe; perforating the casing pipe within previously selected interval; performing the following alternating operations including lowering flexible pipe with nozzle in casing string into above perforation area under the action of the deflector, supplying pressurized liquid through flexible pipe with nozzle, translating thereof to form additional well bores having predetermined depths and lifting the flexible pipe after the predetermined number of well bores forming, finally removing the flexible pipe from the casing pipe. Before casing pipe lowering casing pipe is provided with retained guide. The guide includes process case with through orifices and bush. Formed on inner surface of process case are guiding slots and cylindrical recess located in through orifice area. The bush is inserted in the recess to seal through orifices. The bush is restricted from axial downward displacement by rest. During the lowering operation performing through orifices are arranged within above perforation interval and casing pipe is secured, deflector provided with a number of guiding channels and spring-loaded inserts displaces the bush up to the rest and the spring-loaded inserts cooperate with guiding slots to bring outlet orifices of guiding channels in register with through orifices. To obtain demanded number of well bores flexible pipe with nozzle is removed only from pipe string and deflector after each additional well bore creation.

EFFECT: reduced number of trip operations during well construction.

4 dwg, 1 ex

FIELD: oil and gas production industry, particularly multilateral well construction.

SUBSTANCE: method involves lowering pipe string provided with diverter at end thereof; cutting casing pipe within predetermined interval; lowering flexible pipe with nozzle until flexible pipe enters into opened casing pipe zone under the action of the diverter in alternation with supplying pressurized liquid via flexible pipe provided with nozzle; performing translational flexible pipe movement to create additional well bores having necessary lengths along with removing the flexible pipe to create predetermined number of additional bores. Before casing pipe lowering in the well the casing pipe is provided with acid-soluble insert arranged opposite to formation to be opened. Casing pipe cutting is performed around the full perimeter thereof for necessary length within predetermined opening interval by solving the acid-soluble insert during acid supplying through pipe string into above predetermined interval. After that the diverter having several diverting channel is installed in the interval. After each additional well bore forming flexible string with nozzle is removed only from the pipe string and diverter to create predetermined number of additional bores. After that the flexible pipe with nozzle is finally removed from the casing pipe.

EFFECT: reduced number of trips.

2 dwg

Up!