Sliding coupling with deformed ball seat

FIELD: technological processes.

SUBSTANCE: invention relates to tools for stepwise hydraulic fracturing of a formation. Sliding coupling is opened by a dropped ball. Coupling has a seat installed in a housing, and the seat has segments with deviation outwards from each other by a split ring or another deflecting element. First, the seat has an extended state in the sliding coupling, herewith the segments of the seat are expanded outside thrusted to the housing channel. When a ball of the proper diameter is dropped onto the borehole bottom, the ball is engaged with the extended seat. Supplied fluid medium pressure acting on the ball fitted into the seat moves the seat into the channel of the inner bushing. When this happens, the seat is reduced, which increases the square of the ball engagement with the seat. Finally, the seat reaches the collar in the inner bushing, herewith the supplied pressure acting on the ball fitted into the seat displaces the inner bushing in the housing to open a window for the sliding coupling passage.

EFFECT: technical result is higher efficiency of a sliding coupling with a deformed ball seat.

26 cl, 37 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: coupling comprises a housing with inner trapezoidal grooves, a movable element in the form of a pipe with a mating protrusion of trapezoidal shape on the outer surface and a seat for placement of the ball inside, a port for hydraulic fracturing, a ball activating the movable element, a hollow piston with holes and a supporting spring mounted in the cavity under the piston. The movable element is made without a hole and is provided with two protrusions of trapezoidal shape on the outer surface and one seat. The seat is located between the protrusions of trapezoidal shape.

EFFECT: increase in reliability of fixing of the movable element in the housing of the device, and improvement of quality of processing of the borehole due to improvement of the system of opening ports.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions for wells treatment for use in oil industry. Composition for well treatment containing chemical for well treatment adsorbed using water-insoluble adsorbent, where composition is produced by the well treatment chemical deposition from liquid, at that the well treatment chemical is adsorbed on the water-insoluble adsorbent, and where the well treatment chemical is deposited upon metal salt presence. Well treatment liquid containing the above mentioned composition and carrying liquid. Method of the underground reservoir or wellbore treatment including the above mentioned well treatment liquid injection in the reservoir or wellbore. Method to monitor the well treatment chemical release in the wellbore including the above composition injection in the wellbore. Invention is developed in subclaims.

EFFECT: improved efficiency of treatment in environments with high pH.

38 cl, 3 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to liquids for the hydraulic fracturing of subterranean formations in oil and gas extraction. The method of applying liquid for hydraulic fracturing in the formation of fracturing of subterranean formations includes the retardation of polymer splitting in the liquid for hydraulic fracturing at a temperature from 125 to 400F, when the liquid for hydraulic fracturing contains a liquefier, by the combination of at least one radical acceptor with the liquid for hydraulic fracturing. The mixture for the application in the liquid for hydraulic fracturing contains a radical acceptor and a liquefier. The method of the hydraulic fracturing of subterranean formation includes the supply of the liquid for hydraulic fracturing, containing a propping means, a polymer and the liquefier, addition of the radical acceptor, supply of the liquid to a desired location in a subterranean formation to form at least one hydraulic fracturing, making it possible for the liquefier to split the polymer and reduce the viscosity of the liquid for hydraulic fracturing at a specified time or at a specified temperature. The invention is developed in dependent claims.

EFFECT: increase of viscosity control efficiency.

15 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: group of inventions relates to methods of preparation and treatment for well stimulation. The method of preparation of branch holes includes drilling of multiple branch holes from a vertical well. A selective injection deflector with pass-through for tubing between each respective pair of branch holes is installed. Hydraulic fracturing of multiple branch holes within one completion run by means of consecutive isolation of branch holes from multiple branch holes and supply of hydraulic fracturing fluid medium to each consistently isolated branch hole during lowering are performed.

EFFECT: improvement of efficiency of hydraulic fracturing of branch holes without lifting of equipment.

9 cl, 37 dwg

FIELD: mining.

SUBSTANCE: device comprises a housing with a channel, elastic sealing elements mounted therein on it, between which a piston pair with the sealing rings is placed, and the retaining nut. The working chamber of the piston pair is connected with the housing channel, and in its cylinder a radial hole is made with the ability of communication with the working chamber of the piston pair when packing the well with elastic sealing elements and the additional compression of the elastic sealing elements when hydraulic fracturing pressure with self- locking of the isolated part of the well. The elastic sealing elements are made of soft material and reinforced with rigid elements with different elastic properties.

EFFECT: increase in the sealing capacity of the device and the elastic properties of the elastic sealing elements.

2 dwg

FIELD: mining.

SUBSTANCE: method comprises a test injection of fracturing fluid and a pack of fracturing fluid with proppant, correction of the fracturing project and carrying out the main fracturing process. At that in the high-permeability reservoirs having an absolute permeability of not less than 100 mD, the main process of hydraulic fracturing is carried out using standard working fluid flow rate of 2.2 m3/min to 4.0 m3/min. When pressing the proppant-gel mixture the stepwise reduction of flow rate is carried out with the reduction step in the range of 0.1 m3/min to 0.5 m3/min, but to the value of not less than 2.0 m3/min. The final concentration of proppant is set of not less than 800 kg/m3.

EFFECT: increase in efficiency of intensification of operation of the well by creating a wider and conducting crack in the bottom-hole area of the layer.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes bottom hole back filling, test pumping of a breakdown agent and a pack of the breakdown agent with a proppant, correction of the breakdown project and completion of the primary breakdown process. For backfilling of the bottom hole they use proppant waste of hydraulic rupture completion. The waste is delivered to the bottom hole in portions by means of a sludge pump.

EFFECT: reduction of material consumption for hydraulic rupture.

1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: oil field development method involves working fluid pumping in through the injection wells and formation products withdrawal through the retrieving wells. The oil field is developed with the established ratio of formation products withdrawal compensation through working fluid pumping in. The borehole zone is treated with acid in the injection wells. The oil field is developed with the newly established ratio of formation products withdrawal compensation through working fluid pumping in until approach of the displacement front, changed as the result of acid treatment, to the retrieving well. Hydrofracturing is performed in the retrieving well with withdrawal compensation recovered to the initial value after recovery of formation products water content changed as a result of hydrofracturing.

EFFECT: field oil yield increase.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes uptake of oil via production wells, pumping of a working fluid via injection wells, hydraulic fracture of a bed in the injection and production wells. A pool area is identified with the low bed pressure and the injection well with low injection capacity. Hydraulic fracture is carried out in the identified injection well. Development is carried out to increase the bed and bottom hole pressure in reacting production wells. Hydraulic fracturing is carried out in the production wells in series from a well with the lowest increase of the bed and bottom hole pressure to a well with the highest increase of the bed and bottom hole pressure. At the same time in the wells with a reservoir with high permeability they carry out a sparing hydraulic fracture, and in the wells with the low permeable clayey reservoir they carry out intense hydraulic fracture with the maximum length of the crack.

EFFECT: increased efficiency of the bed hydraulic fracture.

FIELD: oil and gas industry.

SUBSTANCE: method involves landing of tubing string with packer to a well, packer seating, hydraulic fracture liquid injection by the tubing string with packer to a low-permeable formation, hydraulic fracturing of the low-permeability formation with further fracture fixation by injection of liquid carrier with propping agent via the tubing string, pressure relief in the well. Before tubing string landing to the well, water-bearing interlayer interval of the low-permeable formation is perforated to form perforation holes. Then at the wellhead the tubing string is filled upwards from the bottom with a plug, lower hole rows, packer, upper hole rows and additional packer. Inside the tubing string, a mobile bushing with radial channels is inserted to seal lower hole rows of the tubing string tightly in initial position and connecting the tubing string via upper hole rows and perforation holes to the ware-bearing interlayer. A seat is installed inside the mobile bushing, the mobile bushing and the seat are fixated in initial position against the tubing string by a differential shear element. The tubing string is landed to the well, packer and additional packer are seated in the well so as to shot water-bearing interlayer off tightly at two sides, upper water0bearing interlayer is isolated by injection and flushing of water isolation composition via the tubing string through upper hole rows to the water-bearing interlayer through perforation holes under pressure twice lower than hydraulic fracture pressure of the formation, process break is made for solidification of the water isolation composition, then a ball is dropped to the tubing string from wellhead, and overpressure is formed in the tubing string. First the shear element is destroyed, and under impact of overpressure above the ball, mobile bushing is shifted down along the tubing string to a stop against the tubing string plug, overpressure increase in the tubing string is continued, and the shear element is destroyed again. The seat is brought down to a stop against the plug under impact of overpressure above the ball. Upper hole rows of the tubing string are shut off tightly by the mobile bushing, and lower hole rows are connected to the tubing string by radial channels of the mobile bushing.

EFFECT: improved efficiency of hydraulic fracturing.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to mining and may be used to control a flow of a fluid medium in an underground well. Control of the fluid medium flow is carried out autonomously under the variation of a parameter of the fluid medium flow, for instance, density or viscosity. In one version of realisation the mechanism of flow divergence may move between the open and closed positions under the action of a variation of density of the fluid medium and perform the function of limitation of the fluid medium passage via an inlet of an assembled valve. This mechanism of flow divergence may rotate on the axis, rotate or otherwise move under the varied density of the fluid medium. In another version of realisation the flow divergence mechanism performs the function of control of the fluid medium flows ratio via two inlets of the valve. This ratio of flows is used to act at the valve control element, which limits the passage of the fluid medium via the valve. In another version of realisation the flow divergence mechanism moves under the action of variation in the fluid medium, thus causing the variation of the fluid medium flow scheme in the pipe section, and such variation of the flow scheme manages the operation of the assembled valve.

EFFECT: increased efficiency of fluid medium flow management.

49 cl, 28 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to mining engineering and can be used for well tools actuation. Mechanical counter for actuation of multiple output devices includes line indexing device that can count multiple actuation signals and conditions actuation of output devices when a given number of actuation signals is set for each output device. Mechanical counter can actuate a particular output device when a different actuation signal number is set. In this case, output devices are actuated sequentially.

EFFECT: improved reliability of well actuator.

23 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves landing of tubing string with packer to a well, packer seating, hydraulic fracture liquid injection by the tubing string with packer to a low-permeable formation, hydraulic fracturing of the low-permeability formation with further fracture fixation by injection of liquid carrier with propping agent via the tubing string, pressure relief in the well. Before tubing string landing to the well, water-bearing interlayer interval of the low-permeable formation is perforated to form perforation holes. Then at the wellhead the tubing string is filled upwards from the bottom with a plug, lower hole rows, packer, upper hole rows and additional packer. Inside the tubing string, a mobile bushing with radial channels is inserted to seal lower hole rows of the tubing string tightly in initial position and connecting the tubing string via upper hole rows and perforation holes to the ware-bearing interlayer. A seat is installed inside the mobile bushing, the mobile bushing and the seat are fixated in initial position against the tubing string by a differential shear element. The tubing string is landed to the well, packer and additional packer are seated in the well so as to shot water-bearing interlayer off tightly at two sides, upper water0bearing interlayer is isolated by injection and flushing of water isolation composition via the tubing string through upper hole rows to the water-bearing interlayer through perforation holes under pressure twice lower than hydraulic fracture pressure of the formation, process break is made for solidification of the water isolation composition, then a ball is dropped to the tubing string from wellhead, and overpressure is formed in the tubing string. First the shear element is destroyed, and under impact of overpressure above the ball, mobile bushing is shifted down along the tubing string to a stop against the tubing string plug, overpressure increase in the tubing string is continued, and the shear element is destroyed again. The seat is brought down to a stop against the plug under impact of overpressure above the ball. Upper hole rows of the tubing string are shut off tightly by the mobile bushing, and lower hole rows are connected to the tubing string by radial channels of the mobile bushing.

EFFECT: improved efficiency of hydraulic fracturing.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to mining and may be used in a string or equipment for wells completion. The mechanical sliding sleeve (101) includes a guard (105) with openings for interconnection with fluid, the first adapter (103) connected to the sleeve guard and the second adapter (107) connected to the sleeve guard. An insulating bushing (201) is placed in the inner channel formed by the sleeve guard, the first adapter and the second adapter thus forming an opening (113) for interconnection with fluid. The insulating bushing slides along contact surfaces between the first adapter, the second adapter and the sleeve guard in between the open position when fluid comes through openings and the closed position when fluid passage is prevented through openings. The sealing element is coupled functionally to the sleeve guard, the first adapter, the second adapter and the insulating bushing in order to prevent fluid passage through openings when the sleeve is not in the open position and to insulate at least part of contact surfaces from contact with borehole fluids.

EFFECT: improving operational efficiency of the sliding sleeve.

15 cl, 15 dwg

FIELD: mining.

SUBSTANCE: fluid supply device features sensor of plugs (darts, balls, etc.) passing through tool. Actuator shifts tool insert after a preset number of plugs has passed through tool. Insert shift opens catcher in tool bushing. After next plug discharge, catcher connects to the plug in bushing so that fluid pressure applied to the plug installed in tubing string can move the bushing. Shifted bushing opens windows in tool, connecting tool channel to surrounding annular space, thus enabling treatment of formation interval adjoining well shaft to intensify flow. Actuator can use sensor of plugs passing through tool. Spring housed in tool can bend at approach to sensor when a plug passes tool, and sensor counts number of plug passes.

EFFECT: enhanced efficiency of multistage hydraulic fracture in one round trip operation.

32 cl, 25 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes simulating of formation and recording of data on borehole processes by a geophysical instrument run-in into the tubing string at a logging cable and self-contained instruments installed at the lower end of the tubing string. At that simulation of formation is made by breaking a breakable drain valve made of a brittle material of hemisphere shape and installed with a convex part downwards in the lower part of the tubing string; for this purpose a drill stem is fixed under the geophysical instrument and the geophysical instrument is run-in with the stem into the interval with speed sufficient to break the breakable drain valve. At that upper part of the tubing sting above the breakable drain valve is not filled with water and a packer is installed in tubular annulus at the level of the tubing string lower part.

EFFECT: increase of information content and reliability for borehole investigations; reduction of labour intensity, time consumption and equipment costs; possibility to use in wells with any producibility of the investigated formation.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: there is a description of pipe string for well completion installed in position neighbouring to zone or zones where hydraulic fracturing (HF) is to be performed and inflow is to be obtained. In preferable version its peculiarity concludes in valves with sliding couplings allowing implementation of at least two configurations; wide opening and opening of channel with filtering material located in it. Valve unit may have three positions where a position of complete closing is added to two above mentioned positions. After run-in-hole operation valves may be set to position of wide opening in any order required for HF. After completion of HF valves may be either closed or set to filtering position in a differentiated way to get inflow from the zone subjected to HF in any required order. There are various methods for valves actuation described. Pipe string may be provided with telescopic forcers providing HF if it is required to do string cementing. According to alternative version pipe string run in uncased well is just provided with holes for HF liquid passing through and outer packers for provision of HF in any required order.

EFFECT: proving HF in separated zones of formation in required order.

40 cl, 33 dwg

FIELD: oil and gas industry.

SUBSTANCE: multiposition device for selective switching over of flow through packer spindle between opposite directions contains: packer with packer spindle and sealing element designed so that spindle is retained in underground location when sealing element is in seating position; housing of crossflow coupling including components moved relative to each other and adjusted for its selective attachment near upper part of mentioned retained independently packer spindle, at that housing of cross-flow coupling when it is attached near upper part of packer spindle is able to generate relative movement providing opening and closing of channel on housing of cross-flow coupling.

EFFECT: reducing total length of device, orientation of device with higher accuracy.

13 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: down-hole valve includes housing with channel going through it, ball with through hole installed with the possibility of turning at its axis without longitudinal movement so that through hole coincides and not coincides with the said channel. The said ball axis is installed with the possibility of selective longitudinal movement in relation to the housing not depending upon the said turning.

EFFECT: increase of valve operation reliability via reliable keeping of open and closed position.

13 cl, 9 dwg

FIELD: oil and gas industry.

SUBSTANCE: selective well completion device includes a tube slide valve installed on the tube, the body of which is connected to the section of casing string, which is located opposite the productive formation and equipped with holes. Slide valve is equipped with two ring-shaped stops by means of which it is connected to the catch from time to time. Catch includes cylindrical housing with spring-loaded extendable cams and conical brace with a drive, which are located in it, and is connected by means of mechanical draft to the ground lifting mechanism attached to the ground power supply and control unit. At that, the device also includes independent electrical power supply located in the catch housing and made in the form of electrical accumulator or a set of electric batteries, at least two reed relays, similar number of signaling devices - electric lamps and at least three concentrically ring-shaped constant magnets installed in the well, as well as two radio contact devices mutually connected by means of radio on air. One of radio contact devices is located on the catch and equipped with the antenna in the form of electroconductive mechanical draft and connected to the independent power supply, and the other one is located on the ground surface and is connected via control unit to the ground power supply. Mechanical draft is flexible and made in the form of electroconductive rope. Drive of the brace includes electric heater equipped with thermostat, the working member located within its coverage and having the effect of shape memory in the form of straight-line wire from titanium nicelide and reverse element of the working member which is balanced and made in the form of a brace, and electric heat-insulating housing. At that, through the radio contact device fixed in the catch, the heater and each reed relay is separately connected to independent power supply, and by means of both radio contact devices the heater through the control unit and each reed relay separately through the control unit and one of the lamps are connected to the ground power supply.

EFFECT: enlarging functional capabilities of the device.

3 cl, 1 dwg

Downhole tool // 2304212

FIELD: oil production, particularly devices operating inside wells, for instance for circulation valve opening and closing, as well as for packer seating or removal.

SUBSTANCE: downhole tool comprises rod provided with member made as hollow sphere truncated from top and bottom and shaped as upturned cup. The cup bottom has facet extending along outer diameter thereof. Fishing head is arranged on sphere bottom from top thereof. The fishing head has dimensions within the range of sphere radius. Connected with inner sphere bottom part is stem having diameter less than sphere diameter. The stem is connected to the bottom through rod.

EFFECT: increased reliability and simplified technological operations to be performed.

2 dwg

Up!