System and method of cutting the window

FIELD: mining engineering.

SUBSTANCE: window cutting system for use in a subterranean well includes a window milling cutter having selectively retractable and extendable blades, and a wedge deflector assembly having at least one receiving portion. The window eraser is attached to the knuckle-wedge assembly by inserting said blades into said receiving portion. When the window opening method is performed in the underground well fixation, the hole fastening is cut through a window milling cutter, retracts the milling cutter blades to expose the windows, and extends the blades in the knuckle assembly, thereby affixing the wedge-deflector assembly to the window milling cutter.

EFFECT: reduction of tripping operations.

22 cl, 8 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the field of controlled drilling of oil and gas wells. The controlled drilling assembly includes control system placed inside a cylindrical body connected to the drilling bit having radially retractable pistons. The fluid activating the piston flows from the body through the fluid dosing unit, which directs the fluid to the fluid channels in the drilling bit, which lead to the respective pistons. The control system controls the fluid dosing unit in order to ensure selective passing of the fluid though the fluid channels to pistons and to let it out through the outlet in each fluid channel. Selective passing of the fluid forces pistons in the drilling bit to retract in the direction opposite to the desired deviation of the well bore, thus deviating the drilling bit from the axial line of the well bore. The fluid dosing unit is capable to stabilise total area of the flow, to control total area of the flow and change total area of the flow inside the drilling bit by moving the upper element inside the fluid dosing unit.

EFFECT: control system and drilling bit are connected in a special way to facilitate separation in order to change configuration and size of the control section and cutting design of the drilling bit simultaneously.

42 cl, 45 dwg

Deflection device // 2539494

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas well drilling and aims at casing window cutting and further auxiliary hole drilling. A deflection device comprises a whipstock with an inclined working surface configured in the form of a chute in an applied carbide mill, an anchor connected to the whipstock through an adapter bushing, a high-pressure flexible tube, a whipstock fixation unit. A chute portion from both sides from below is machined to reduce a stagnant portion, while a low-pressure chamber for transferring the device into the transport position is a shank bore of the anchor with a plunger inside. The adapter bushing comprises a piston used to press the whipstock to the casing pipe, and its profile bevel comprises disk spring washers in a socket for pressing the whipstock head to the boring casing after the cutter detachment.

EFFECT: higher technical and process drilling factors of multi-lateral wells.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas production industry, namely to a tail pipe for side hole attachment in a multi-lateral horizontal well. The tail pipe comprises a casing pipe of an effective length, a drive shoe with an end face displaced to an outer diameter, connected through an operating connection pipe to a body of a drive shoe clamper, forming a hinge fitting with an inner connection pipe in an articulating hub; beside the fitting, the articulating hub also comprises a back-pressure valve with a rod-opened retainer when lowering into the well; a stop assembly body is provided with a displacement plug casing; the lower displacement plug is provided on the connection pipe of the fitting, which is attached through the bore to the body of the removed tail pipe assembly; the body accommodate a crown hub with a put-on top of a profile partition, while a lower side seats on a lock connected to the hinge through an inner left thread to form a closed cavity inside the partition. The closed cavity of the partition is closed with the valve and additionally with a collet gate to protect from pressure jumps in a hydraulic canal of the tail pipe; the cavity has two sealing canals to be filled with water and de-aerated; corrugations of the partition are put on crown flanges of the hub and sealed, while a lower side is mated with the lock which comprises a seat for a foundation cutter; along the left thread, the lock is connected to the hinge to form a detachment assembly; the hinge fitting from the drive shoe, connection pipe and drive shoe clamper are configured to move in the axially symmetrical and radial direction along the well bore.

EFFECT: provided considerable reduction of the non-productive time required to attach the horizontal side hole during the multi-lateral well construction.

12 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells, in particular to devices intended for sidetracking. The tool includes cutters - window cutter with a tip and expanding cutter having a common case with the central channel having stepped and arched surfaces, a whipstock fixed to the lower end of the window cutter, equipped with a shear lug made as a longitudinal corrugated pipe with a blind lower end and arms made as abrasive elements at external surface, and a hydraulic circuit. The tip body is made solid with a flushing port and an eccentric outlet opening interconnected to a flushing port made as a grove at the tip working area. The cutter blades are made as separate steel straps with flat-topped longitudinal grooves with cutting elements. At the lug external surface, along the perimeter there is a sealant applied with thickness up to 5mm in the form of straps placed at the distance equal to width of the strap width at least. The lug slips are made similar to the cutter blades and installed diametrically opposed to each other in the area of arched surface transfer of the corrugation towards cavities in longitudinal direction by intervals.

EFFECT: reduced emergency rate, improved reliability of the whipstock setting and the well bore separation.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: equipment unit is designed so that it may be installed in the well bore and comprises surface of the outside wall intended for deflection of a cutter to form a branch hole as well as deflection of at least a part of the component for the completion assembly in direction towards the branch hole. A part of the component for the completion assembly represents an articulation joint used for completion of the side pipe branch and comprises an interrupter and a branch hole, subsystem for temporary plugging of the space between the above surface and a channel wherein the interrupter may be inserted and a bushing fixed to the temporary plugging and capable of shifting by a shutter. The above bushing is designed to prevent entrapment of at least a part of waste in a compactor, at that the above surface may be matched with a shutter and deflect the side pipe branch in direction towards the branch hole of the well.

EFFECT: completion of the branch hole of the well without shutter removal before its sidetracking.

14 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to drilling, particularly, to deflectors of drilling or milling bits. Proposed device is configured for contactless attachment of deflector to milling/drilling bit. Note here that said bit comprises shank and multiple cutting blades. The latter extend below the shank to define the bit outer tooth and cutting surface. Besides it includes at least one hole for mud escape between two blades of set multiple cutting blades. It comprises upper yoke to be arranged around said bit, at least one connector arranged at first end on upper yoke above cutting blades to extend therefrom downward. Note here that said connector can extend through bit mud discharge bore. Note here that said connector features length sufficient for it to extend beyond bi cutting surface. Deflector can be fitted on second end of at least one connector.

EFFECT: safe and efficient trip.

30 cl, 23 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises mounting of locking assembly with deflector wedge with one deflection surface in the well main borehole constructed to design depth. Locking assembly is composed of hydromechanical anchor with seat to be locked below sidetracking interval. Prior to sidetracking, casing string is exposed by cutting the "opening". After sidetracking, deflector wedge is withdrawn from the well at disconnecting it from the locking assembly. Extra longer deflector wedge is lowered to interaction with hydromechanical anchor seat to prevent its turn. Prior to sidetracking, casing string is opened by cutting an extra "opening" with subsequent withdrawal of deflector wedge after construction of second side hole. Proposed device comprises deflector wedge to be lowered on the string and equipped with one deflecting surface connected by shear elements via adapter with locking assembly composed of hydromechanical anchor equipped with pipe corrugated in lengthwise direction and plugged at bottom by shoe and hydraulic locator arranged under said adapter. Note here that said locator is composed of the case with lengthwise channel communicated with said corrugated pipe and string. Said case houses the piston displacing axially at fluid overpressure and equipped with conical surfaces to act at pushers arranged regularly over the case perimeter and height to allow limited radial displacement outward to interaction with casing string walls. Note here that case top has groove to mate with adapter ledges at deflector wedge and extra deflector wedge to rule out their turn and to lock them at preset position.

EFFECT: sidetracking of two opposing boreholes from one level of existing wells, lower costs.

2 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method lies in installation of fixing unit with a whipstock for one deflective surface in the main hole constructed up to the design depth. The fixing unit is made in the form of hydromechanical anchor with mounting seat, at that the anchor is fixed below the sidetracking space. Before sidetracking the casing pipe is penetrated by window cutting and after offshoot construction the whipstock is retrieved from the well disconnecting it from the fixing unit; auxiliary longer whipstock is run in till it interacts with the mounting seat of the anchor fixing it from rotation; before sidetracking of additional offshoot the casing pipe is penetrated by additional window with subsequent retrieval of auxiliary whipstock after construction of the second offshoot. The device for method implementation includes a whipstock run in at the pipe string and equipped with one deflective surface and connected from below by breakable elements through the crossover shoe with the fixing unit made in the form of hydromechanical anchor equipped with longwise corrugated pipe blinded from below with the shoe and a hydraulic centring skid located below the crossover shoe. At that centring skid is manufactured as a body with a gallery communicating with longwise corrugated pipe, pipe string and pushers located evenly along the perimeter and height of the body limits radial movement outside until interaction with the casing walls at excess pressure in the gallery; at the top the body is equipped with a groove for matching intrusions of the crossover shoes of the whipstock and auxiliary whipstock in order to exclude rotation and ensure their setting in preset direction.

EFFECT: group of inventions allows drilling of two opposing additional boreholes from the same level of the existing well, engaging of the main borehole into operation and reducing material costs for construction of the downhole splitter.

3 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: cement bridge is installed in a well. A borehole hydromechanical pusher is fixed on the end of a drill string. An upper end of a wedge-shaped diverter is attached to the lower end of the pusher with shear screws. The diverter is lowered to the well till the cement bridge. An axial load on the drill string is created to unfasten the pusher casing and liquid is supplied for wedging up the pusher in a cased well bore and for cutting off the screws attaching the upper end of the wedge-shaped diverter to the lower end of the pusher. The pusher includes a hollow adapter the lower end of which is connected to a ram holder interacting with the ram. Inside the ram holder there is a longitudinal end-to-end channel. From the lower end onto the ram holder with possibility of longitudinal movement there led is a casing with a side opening for the ram. On the lower casing end there fixed is a sleeve with a limiting bushing, inside which there led is a hollow stock with a longitudinal channel inside it, which is shut off from below. The lower end of the hollow stock is connected with shear screws to the upper end of the wedge-shaped diverter. The lower end of the diverter is equipped with a fastening device.

EFFECT: fixation of a diverter in a well at impossibility of creating a load on a working face with the drill string weight, without using any additional equipment.

2 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to devices for drilling of inclined and horizontal sites of the well. The device contains housing with inclined slots and rod placed inside it. From underneath piston is fixed rigidly to the rod; at that the piston is made annular and placed inside chamber formed by outer wall of the rod and inner wall of the housing. In inclined slots pads with teeth are fixed by pull-bars with rod. At the housing bottom there is lower crossover shoe with inner annular narrowing. Downstream of inner annular narrowing the crossover shoe has annular expansion. From above the device is equipped with telemetric system. The lower end of the rod can interact hermetically with annular narrowing. Upward spring-loaded and hollow lower piston is installed in annular expansion; the piston can move in horizontal plane to the upper part until it leaves the area of hermetic connection with annular narrowing. The rod is spring-loaded with bigger load than upward-loaded lower piston. Between the lower piston and annular narrowing there is a small ball and from bottom of annular narrowing and from top of the lower piston there are accesses for the ball which are located opposite each other.

EFFECT: device provides possibility of multiple correction of slope angle in drilling process without lifting to the wellhead.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: at implementation of the method, cutter advancing devices are connected to a cutter; a pressure drop is created between the above cutter advancing device and the above cutter; with that, the above pressure drop causes descending movement of the above cutter advancing device and the above cutter and engagement of the above cutter at least with some part of the above cased well shaft is provided.

EFFECT: improving efficiency of an opening cutting process due to control of a load applied to a cutter.

23 cl, 3 dwg

Deflection device // 2539494

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas well drilling and aims at casing window cutting and further auxiliary hole drilling. A deflection device comprises a whipstock with an inclined working surface configured in the form of a chute in an applied carbide mill, an anchor connected to the whipstock through an adapter bushing, a high-pressure flexible tube, a whipstock fixation unit. A chute portion from both sides from below is machined to reduce a stagnant portion, while a low-pressure chamber for transferring the device into the transport position is a shank bore of the anchor with a plunger inside. The adapter bushing comprises a piston used to press the whipstock to the casing pipe, and its profile bevel comprises disk spring washers in a socket for pressing the whipstock head to the boring casing after the cutter detachment.

EFFECT: higher technical and process drilling factors of multi-lateral wells.

5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to drilling, particularly, to deflectors of drilling or milling bits. Proposed device is configured for contactless attachment of deflector to milling/drilling bit. Note here that said bit comprises shank and multiple cutting blades. The latter extend below the shank to define the bit outer tooth and cutting surface. Besides it includes at least one hole for mud escape between two blades of set multiple cutting blades. It comprises upper yoke to be arranged around said bit, at least one connector arranged at first end on upper yoke above cutting blades to extend therefrom downward. Note here that said connector can extend through bit mud discharge bore. Note here that said connector features length sufficient for it to extend beyond bi cutting surface. Deflector can be fitted on second end of at least one connector.

EFFECT: safe and efficient trip.

30 cl, 23 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises mounting of locking assembly with deflector wedge with one deflection surface in the well main borehole constructed to design depth. Locking assembly is composed of hydromechanical anchor with seat to be locked below sidetracking interval. Prior to sidetracking, casing string is exposed by cutting the "opening". After sidetracking, deflector wedge is withdrawn from the well at disconnecting it from the locking assembly. Extra longer deflector wedge is lowered to interaction with hydromechanical anchor seat to prevent its turn. Prior to sidetracking, casing string is opened by cutting an extra "opening" with subsequent withdrawal of deflector wedge after construction of second side hole. Proposed device comprises deflector wedge to be lowered on the string and equipped with one deflecting surface connected by shear elements via adapter with locking assembly composed of hydromechanical anchor equipped with pipe corrugated in lengthwise direction and plugged at bottom by shoe and hydraulic locator arranged under said adapter. Note here that said locator is composed of the case with lengthwise channel communicated with said corrugated pipe and string. Said case houses the piston displacing axially at fluid overpressure and equipped with conical surfaces to act at pushers arranged regularly over the case perimeter and height to allow limited radial displacement outward to interaction with casing string walls. Note here that case top has groove to mate with adapter ledges at deflector wedge and extra deflector wedge to rule out their turn and to lock them at preset position.

EFFECT: sidetracking of two opposing boreholes from one level of existing wells, lower costs.

2 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method lies in installation of fixing unit with a whipstock for one deflective surface in the main hole constructed up to the design depth. The fixing unit is made in the form of hydromechanical anchor with mounting seat, at that the anchor is fixed below the sidetracking space. Before sidetracking the casing pipe is penetrated by window cutting and after offshoot construction the whipstock is retrieved from the well disconnecting it from the fixing unit; auxiliary longer whipstock is run in till it interacts with the mounting seat of the anchor fixing it from rotation; before sidetracking of additional offshoot the casing pipe is penetrated by additional window with subsequent retrieval of auxiliary whipstock after construction of the second offshoot. The device for method implementation includes a whipstock run in at the pipe string and equipped with one deflective surface and connected from below by breakable elements through the crossover shoe with the fixing unit made in the form of hydromechanical anchor equipped with longwise corrugated pipe blinded from below with the shoe and a hydraulic centring skid located below the crossover shoe. At that centring skid is manufactured as a body with a gallery communicating with longwise corrugated pipe, pipe string and pushers located evenly along the perimeter and height of the body limits radial movement outside until interaction with the casing walls at excess pressure in the gallery; at the top the body is equipped with a groove for matching intrusions of the crossover shoes of the whipstock and auxiliary whipstock in order to exclude rotation and ensure their setting in preset direction.

EFFECT: group of inventions allows drilling of two opposing additional boreholes from the same level of the existing well, engaging of the main borehole into operation and reducing material costs for construction of the downhole splitter.

3 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: tool includes starting, straight-through and calibrating mills-reamers. Cutting plates fixed in the starting mill-reamer are located concentrically relative to central longitudinal axis of a hollow shaft. Cutting plates in the straight-through and calibrating mills-reamers are located with similar eccentricity and opposite on both sides relative to central longitudinal axis of the shaft. Cutting plates fixed in the straight-through mill-reamer and cutting plates fixed in the calibrating mills-reamers are fixed in longitudinal slots of screw blades formed with screw channels. The housing of the calibrating mill-reamer, a hollow shaft of the calibrating mill-reamer and a hollow shaft of the starting and straight-through mills-reamers are made in the form of a single hollow framework. Sum of maximum eccentricities of cutting plates fixed in longitudinal slots of screw blades of the calibrating and straight-through mills-reamers is equal to difference of radii of cutting plates of the calibrating and straight-through mills-reamers relative to their own longitudinal central axes located opposite on both sides relative to central longitudinal axis of the single framework.

EFFECT: increasing service life and improving reliability; preventing accident risk; providing finish milling with smooth edges; improving cutout accuracy of a window in a well casing pipe.

2 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes starting, straight-through and calibrating mills-reamers with cutting plates fixed in them. Starting and straight-through mills-reamers are made in the form of a single hollow housing. Calibrating mill-reamer is rigidly fixed on a hollow shaft. Cutting plates in the straight-through and calibrating mills-reamers are located with similar eccentricity and opposite on both sides relative to central longitudinal axis of the hollow shaft. The calibrating mill-reamer and the single housing of the starting and the straight-through mills-reamers are provided with screw channels. The calibrating mill-reamer with screw blades and the hollow shaft are made in the form of a single hollow calibrating module. In the front part of the calibrating module there made along the axis in front of screw blades are longitudinal cavities coinciding in circumferential position with longitudinal slots of screw blades. In each cavity there fixed is a front cutting plate with projection above outer surface of the front part of the calibrating module along the axis in front of screw blades, as well as with projection above the front surface of screw blade of the calibrating module.

EFFECT: increasing service life and improving reliability, thus providing uniform wear of cutting plates.

4 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes a cylindrical housing from dielectric material with an axial longitudinal channel for supply of electrolyte with density exceeding the density of borehole fluid and a side transverse channel, the axes of which intersect in its central part. In the body of cylindrical housing there radially made is an inclined channel in the form of a sector of an annular ring, which is hydraulically connected to the axial longitudinal channel. The inclined channel angle to the plane of cross section of the cylindrical housing is 20-40, and height of the incline channel is within 10 to 30 mm. On side surface of the housing there made diametrically opposite to the inclined channel is a longitudinal cavity for an elastic membrane so that a cavity hydraulically connected to the side transverse channel is formed. A removable electrode, on the surface of which dielectric elements are arranged, is installed under the inclined channel. The removable electrode is a cathode and connected through an electrically insulated cable to a negative pole of the current source, and the casing pipe is an anode and connected to the positive pole of the current source.

EFFECT: improving quality and cutout efficiency of a window in the well casing string.

3 dwg

FIELD: mining.

SUBSTANCE: device includes hollow mill-reamer fixed at drilling string, on which there hanged is a deflecting wedge by shear element that is equipped with hydraulic attachment assembly in casing string with channel for drilling mud supply coming through drilling string. Deflecting wedge has tilted surface in a form of a groove, hydraulic attachment assembly of deflecting wedge in the casing string is equipped with expansion unit and, at least, one slip that has teeth on external surface, and drilling mud supply channel represents a pipeline that connects internal cavity of mill-reamer and, hydraulic attachment assembly of deflecting wedge in the casing string. Deflecting device includes fishing sleeve with internal collar and circulation holes and nozzle orifice with central channel and seat for fault ball, all coaxially mounted inside the hollow mill-reamer. Hydraulic attachment of deflecting wedge in casing string includes cylinder sleeve connected to expansion unit of deflecting wedge, hollow rod located inside the cylinder sleeve, threaded cap connected to the bottom part of the cylinder sleeve, annular piston capable of sliding between cylinder sleeve and hollow rod, supporting bush connected to annular piston by shear screws. Hollow rod is connected to the pipeline that connects the internal cavity of mill-reamer and hydraulic attachment assembly of deflecting wedge in casing string.

EFFECT: increase of reliability of deflecting device fixing in well casing string, the structure is simplified, reduction of accident rate and cost of drilling works, provision of clean milling with smooth edges, increase of opening cutting accuracy in well casing string, reduction of vibration level, increase of cutting ability and lifetime of mill-reamer for cutting complete opening in casing string during one submerging into the well, improvement of passability of hook-up with gerotor hydraulic motor and drilling bit at the following drilling of side bore for oil extraction through cut opening in casing string wall.

5 cl, 10 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in lowering perforator to preset depth, fitting it against casing tube wall by locking mechanism and its gaged displacement along well axis, further upward displacement with stable proportioned feed and slot cutting in casing tube wall by extending disc mill, and further cutting of slot in productive bed by cutting tool arranged level with said mill. In lowering said perforator, it is turned about lengthwise axis unless disc mill is leveled with well apsidal surface. Proposed device comprises saw with lever carrying endless chain with cutting elements and engaged with the case to turn it from lengthwise position into crosswise position in well, chain drive and extending disc mill arranged in the case level with cutting device, locking and gage displacement mechanism with wheel-type driver to rest on casing tube inner surface in perforation zone and elastic damper thrusts. Aforesaid mill is arranged to rotate and displace toward casing tube.

EFFECT: higher reliability and validity.

4 cl, 5 dwg

FIELD: mining, particularly to drill additional bores from production strings of quick-acting well or marginal well producer.

SUBSTANCE: system comprises deflecting wedge with guiding surface, mechanical anchor connected to lower deflecting wedge end, milling tool including window milling bit detachably fastened to upper end of deflecting window and two mill-reamers located above window milling bit along well bore. Window milling bit is provided with widened section formed in upper part thereof. Deflecting wedge has ledge, which may cooperate with widened section of window milling bit during casing pipe cutting operation. Milling bit has replaceable blades reinforced with hard alloy and/or cutting inserts. Mill-reamers are connected one to another through flexible connection pipe by means of bi-buttress tool-joint thread and have body sections of reduced diameter. Mill-reamer diameters increase by one standard size in upward direction from window milling bit.

EFFECT: reduced wear of cutting surfaces, increased service life, improved efficiency of metal cuttings removal with flushing liquid, reduced number of operations necessary for tool replacement and decreased number of trips.

3 cl, 7 dwg

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