Multilateral well building method

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

 

The invention relates to the oil and gas industry, namely for the construction of the bushes oil and gas wells.

A known Method of construction multilateral wells" (A.S. No. 1798466, MKI E 21 In 7/06, publ. BI No. 8, 28.02.93, including the drilling of the vertical main trunk, installation and mounting in the trunk of the drum located in its plane by guide columns and deflecting the node at the bottom, alternate drilling, drilling and fastening additional trunks, when drilling the bottom portion of the main stem increases in diameter, the drum is placed directly above the bottom section of the base of the trunk, and the drilling of additional trunks perform well through the wall of the latter.

The disadvantages of this method are:

first, the necessity of drilling the main stem of large diameter, which requires a large investment of time, especially in deep wells, and, as a consequence, huge costs;

secondly, the guide columns also increases the cost of construction multilateral wells;

thirdly, such an arrangement is well complicated for both construction and operation.

The closest in technical essence and the achieved result is "Method and device for horizontalresolution wells" (US patent No. 5413184, IPC E 21 In 7/08, publ. 09.05.1995, including the descent into the casing at a predetermined depth of the column of pipes at the end of which is the whipstock, the descent into the string of pipe flexible shaft with a cutter on the end to interact with the whipstock, rotation and translational movement of the flexible shaft with the cutter, which as a result of interaction with diverter cuts through a window in the casing and enters the reservoir at a specified distance obtaining process of the channel, removing the flexible shaft with the cutter from the well, the descent into the string of pipe flexible pipe with nozzle to the entrance under the action of the diverter in the window casing, the supply of fluid under pressure through the flexible pipe with nozzle with simultaneous translational movement to increase the technological channel to the required length.

The disadvantages of this method are the need when building a multilateral wells perform successive operations: rotate to the desired angle of the column of pipes, descent flexible shaft with a cutter, cutting the channel, the deepening of the channel by means of a flexible pipe with nozzle under the action of pressure fluid, and so for each additional horizontal stem that leads to great loss of time and, consequently, the material cost (see instructions RadTech International Inc. for the construction of wells (US No. 5413184), including multilateral).

T is nicesly object of the present invention is to reduce material costs and financial costs by reducing the number of trip-UPS of the equipment and eliminate rotation of the pipe string during construction multilateral wells using for sinking flexible pipe with nozzle under the action of pressure fluid through the opening of the casing around the opening.

The technical problem is solved by the method of construction multilateral wells, including the descent into the casing pipe string at the end of which is the whipstock, the opening of the casing in the desired interval, alternating descent into the string of pipe flexible pipe with nozzle to the entrance under the action of the diverter in the area of the opening of the casing, the flow of liquid under pressure through a flexible pipe with nozzle simultaneous translational movement for forming additional trunks to the desired length by removing the flexible pipe to the required number of additional barrels, after which a flexible tube with nozzle completely removed from the casing string.

What's new is that the casing before the descent equip soluble insert, which have opposite breakable layer, and the opening of the casing implement across its diameter and to the required length in the desired range of opening by eliminating the acid-soluble insertion of the casing when the flow of acid through the column pipe in the interval of opening, after which the whipstock, which is made with several otklonyamiy and channels, set in the interval of the opening, and a flexible column with nozzle after the formation of each additional trunk only extracts from the pipe string and whipstock to obtain the required number of additional trunks.

Figure 1 shows a diagram of the elimination of acid-soluble paste.

Figure 2 shows a diagram of the formation of additional trunk.

Specific example

The method of construction multilateral wells is as follows. The casing 1 (see Figure 1)with the acid-soluble box 2, down into the well, while it is placed in the interval of opening 3 opposite the productive formation 4. Next, produce the cementing of the casing 1 by any of the existing technologies (not shown). After waiting for the solidification of the cement in the casing 1 produce the descent of the column of pipes 5 with diverter 6 and getcashadvance with him by the sleeve 7 at the end. In the transport position, the sleeve 7 is fixed with a collet stop 8 by shear element 9. The width of the fixing part With the color of the fence 8 is larger than the width of the joints (not shown) of the casing 1. The whipstock 6 has an inside bending the channels 10, the number of which is determined by the number of required additional trunks in the reservoir 4.

As an example, rassmatrivaetsi 6, having two bending channel 10' and 10".

After the descent into the well column pipe 5 with diverter 6 is placed over the roof of the productive layer 4. Then the string of pipe 5 by bending the channels 10' and 10" standoff 6 produce the injection of acid 11 (for example, technical hydrochloric acid) in the casing 1 in the interval of the opening 3 and leave on thermochemical reaction for a time sufficient for the complete destruction of the soluble insert 2.

After a certain period of time allotted for thermochemical reaction, which results in the destruction of the insert 2 in the casing 1 in the interval of opening 3 opposite the productive formation 4, column pipe 5 to lower a little until collet stop 8 is fixed relative to the area of the opening 3 on the bottom 12 of the casing 1. Next, produce a discharge pipe string 5 (Figure 2), while the shear element 9 is destroyed, and the whipstock 6 goes down and sits on the collet stop 8, dojima it to the bottom end 12 of the casing 1. Large bending channels 10' and 10" standoff 6 are within the range of the opening 3 opposite the productive formation 4. Then in the column pipe 5 lower flexible pipe 13 with the nozzle 14 to the entrance under the action of the diverter 6 through its bending channel 10' in the interval of the opening 3 of the casing 1, which is fixed on the mouth of the weight indicator (not p is the cauldron), and then at the wellhead put a label (not shown) on the flexible tube 13 to the beginning of the formation of the additional shaft 15. Next serves fluid under pressure through a flexible pipe 13 with the nozzle 14 with a simultaneous forward movement, resulting in the interval of the opening 3 is formed an additional shaft 15, which is increased to the required length L. then the flexible pipe 13 with the nozzle 14 is extracted from the additional barrel 15 of the casing 1 and the whipstock 6 column pipe 5 to the above tags plus the length of the bending channel 10′. Then a flexible pipe 13 with the nozzle 14 is slid in the second bending channel 10" standoff 6 is determined by the lower weight of the flexible pipe 13 (on the weight indicator) when it is lowered to the label on the mouth. Then form a new secondary shaft 15'. Then again under the action of the pressure fluid supplied through a flexible pipe 13 and a nozzle 14, to form a second additional shaft 15' of the desired length L in a given interval.

In cases where the label of the flexible pipe 13 is lowered to the mouth significantly lower without changing the weight, then remove the flexible pipe 13 to the mark plus the length of the bending channel 10', after which a flexible pipe 13 is turned at a small angle to the natural residual curvature changed its orientation, and again attempt to until the flexible tube 13 will not stop at the label that will be recorded at the wellhead on the weight indicator. Almost hit the next bending channel 10" flexible pipe is provided for 1-3 attempts with four bending of the channels 10 in the whipstock 6.

In the example considered the option of building multilateral wells with two additional trunks 15, similarly works for the required number of additional shafts 15, but this requires the use of a whipstock 6 with the amount of bending of the channel 10, is the number of additional shafts 15.

The use of the proposed method due to the opening of the casing around the diameter reduces the number of trip-UPS of equipment, and the presence of the whipstock with multiple bending channels allows to exclude the operation of rotating the pipe string, which together can reduce material and financial costs for the construction of multilateral wells using for sinking a flexible pipe with nozzle under the action of pressure fluid.

The method of construction multilateral wells, including the descent into the casing pipe string at the end of which is the whipstock, the opening of the casing in the desired interval, alternating descent into the string of pipe flexible pipe with nozzle to the entrance under the action of the diverter in the area of the opening of the casing, the supply pressure p is d pressure through a flexible pipe with nozzle simultaneous translational movement for forming additional trunks to the desired length by removing the flexible pipe to the required number of additional trunks, after which a flexible tube with nozzle completely removed from the casing, wherein the casing before the descent equip soluble insert, which have opposite breakable layer, and the opening of the casing implement across its diameter and to the required length in the desired range of opening by eliminating the acid-soluble insertion of the casing when the flow of acid through the column pipe in the interval of opening, after which the whipstock, which is made with several deflecting channels, set in the area of the opening, and a flexible column with nozzle after the formation of each additional trunk extracted only from the column pipe and diverter to obtain the required number of additional trunks.



 

Same patents:

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: 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: 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

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!