Filter for downhole hydraulic engine

FIELD: machine building.

SUBSTANCE: invention relates to rotational drives disposed in a well, namely to filters for cleaning drilling fluid from mechanical impurities at the entrance to a hydraulic downhole motor. Device comprises a tubular body with threads at the edges, a filter module installed in the tubular body, which includes a filter tube with slotted channels, a fairing located on the inlet side of the tube, an inlet and an outlet sleeve. Filter tube is threaded to the outlet sleeve, the filter module forms a cavity for receiving mechanical impurities inside the tubular body, an elastomer seal is placed between one of said inlet or outlet bushings and the tubular body. Filter tube is designed with an axial displacement of adjacent slot channels relative to each other, in the circumferential row of slit channels located at the outlet of the filter tube, each slit channel is located between a pair of adjacent slit channels made with an axial displacement. Fairing is made with an outer centering belt, the inlet sleeve is made with outwardly directed ribs, mounted on the outer centering belt of the fairing. Outlet portion of the tubular body is formed with a central opening defining a transverse annular projection directed toward the exit of the tubular body. Output sleeve is provided with a latch mechanism in the form of a collet shank equipped with stops on the petals of the collet shank, cooperating with a transverse annular projection directed towards the exit of the tubular body. Entrance edges of outwardly directed ribs at the points of contact with the outer surface of the inlet sleeve are located upstream of the fluid as compared to the input edges of the said fins located at the maximum radial distance.

EFFECT: resource and reliability are increased due to the reduction of the hydroabrasive erosion of the slot channels at the outlet of the filter tube, the structure is simplified.

5 cl, 5 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and may be used in the operation of a horizontal well. According to the method well operation is performed. A pipe string is run down to the horizontal well. An insulating material is injected through the pipe string to a water-inflow interval of the productive formation. Oil is extracted until the horizontal well is flooded. Under the main borehole along the boundary of the oil-water contact an additional borehole is drilled from the horizontal well per 50 m longer than the old hole. The coil tubing is run down to the well complete from below with a hydraulic whipstock and a screen, which openings are covered hermetically by a hollow bushing. The process fluid is injected to the coil tubing thus creating an excess pressure. Simultaneously the coil tubing is moved down until it gets to the additional borehole. The coil tubing is run down up to the bottomhole of the additional hole. At the wellhead a top cementing plug is set into the coil tubing. An excess pressure is created in the coil tubing above the top cementing plug and the hollow bushing is moved thus opening the screen openings. Microcement grout is injected through the coil tubing and flushed to the additional hole and the bottomhole zone. Simultaneously the coil tubing is pulled out for the purpose of additional hole filling with the microcement grout. Flushing of the microcement grout is stopped when pressure increases in the coil tubing up to a permissible value. The coil tubing is pulled out from the well and the process is withheld for cement setting and hardening. The additional hole is cut off from the old hole by setting a bridge plug in a kickoff interval at the inlet to the offshoot. A pump is run down at the process pipe string to the old hole of the horizontal well and operation of the horizontal well is started. At water encroachment into the produced product the process pipe string with the pump is pulled out from the well, a geophysical study is performed and a water-producing interval is indentified in the horizontal well. The water-producing interval in the old hole of the horizontal well is isolated.

EFFECT: increased efficiency of the method due to the complete exhaustion of oil reserves from the productive formation notwithstanding the drawdown value.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil and gas industry, and namely to methods of automatic flow control at well operation of oil and gas deposit. According to the method injectors and producers equipped with pump units and electric motors are used. A passive sonar multiphase flow meter is mounted at the mouth of each well. Pressure, temperature and flow rate is defined continuously in real time for each phase, including water. The data are collected and transferred to automatic flow process control system continuously in real time. The data are averaged for a certain period of time. Average flow rate is processed and defined by phases for the selected period of time. The results are compared with preset parameters and based on flow rate data for each phase dependency of flow rate for each well is defined on pumped volume of brine water. Version of pump units operation with electric motors for producers is selected and maintained so that oil flow rate is maximum and pumped volume of brine water and power consumption is minimum. At that when design flow rate values are exceeded one of the following actions is performed: efficiency of pump unit is reduced due to reduced rate speed of the electric motor; efficiency of pump unit is increased due to increased rate speed of the electric motor; pump unit is stopped temporarily to accumulate oil in the bottom hole. Product of the producers is separated into phases and transported depending on the phase to oil and gas collection system or reservoir pressure maintenance system.

EFFECT: increased efficiency of the method due to increased oil flow rate, reduced volume of brine water pumped and reduced power consumption.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to systems of oil and gas equipment automatic control and allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment. According to the method gas pressure and temperature is measured periodically upstream and downstream gas equipment, gas flow rate through gas equipment or gas pressure drop is measured at orifice located in the gas flow passing through gas equipment. Then against measured values hydrate formation coefficient is formed for operating gas equipment and degree of hydrate formation is evaluated against deviation of this coefficient from the basic value determined in hydrate-free mode of gas equipment. In hydrate-free mode of gas equipment basic values of the above hydrate formation coefficient are used as technical state indicator for gas equipment.

EFFECT: method allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method fluid pumping from the well is alternated with fluid accumulation in the well at switched off pump set and average delivery in time is controlled for the purpose of matching with the well flow rate by changing speed rate of the pump shaft. Pump capacity in pumping process is controlled by a submersible flow rate meter placed at the pump output. Pumping out will be performed till the pump reaches the preset minimum pressure at suction and accumulation will be performed till the pump reaches the preset maximum pressure. Pressure value is controlled by means of a submersible pressure sensor. Frequency of the pump shaft rotation during pumping period is changed on the basis of readings of the submersible flow rate meter so that maximum value of efficiency factor is reached for the pump during pumping period. Time of accumulation is limited by regulations on motionless fluid in surface equipment in winter time by permitted decrease of oil temperature in the submersible electric motor and permitted frequency of stops and starts of the latter. Maximum pressure value for the cemented stratum is selected on condition of maximum oil production and for the stratum destructed intensely in extraction process on conditions of minimum discharge of mechanic impurities.

EFFECT: increased production and maintained reliability for submersible equipment due to its operation in the mode of maximum efficiency factor.

FIELD: physics.

SUBSTANCE: methods and systems for gathering, deriving and displaying the azimuthal brittleness index of a borehole are disclosed. Certain embodiments include various methods for calculating and displaying borehole measurements in real-time for geosteering and drilling operations. One embodiment of the disclosed method for calculating and displaying azimuthal brittleness includes a step of taking measurements of compressional and shear wave velocities as a function of position and orientation from inside the borehole. These velocity measurements are taken by an azimuthal acoustic device. Azimuthal brittleness is then derived based on the compressional and shear wave velocities.

EFFECT: high reliability of data of planning geological survey operations.

19 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes cyclic forced gas pumping from the annulus and pressure decreasing in it. Periodically the well flow header is partially closed. Pressure upstream the shutdown element of the header is increased to ensure the produced fluid supply to the expansion chamber of the tank with resilient element and to accumulate mechanical energy in the expansion chamber. Then full opening of the header shutdown element is performed. Pressure upstream the shutdown element is decreased, and fluid is displaced from the expansion chamber to the header due to the accumulated mechanical energy. Each cyclic volume increasing of part of the tank above the expansion chamber ensures annulus gas suction in it, and this volume decreasing ensures gas displacement to the header.

EFFECT: possibility of gas pumping from the annulus in tubing string of the well for different methods of mechanised oil production.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil production industry, in particular, to secondary and tertiary methods of enhanced oil recovery for beds with low oil saturation that envisage use of equipment for production of gaseous nitrogen with high pressure and temperature. Nitrogen compressor plant comprises a multistage piston-type compressor with a power drive unit made as diesel engine, and gas-separating unit. Output of the compressor intermediate stage is coupled to input of gas-separating unit. Output of gas-separating unit is coupled to input of the compressor stage, which follows the intermediate stage. At that nitrogen compressor plant includes heat exchanger, which working medium input is coupled to the compressor output. Input of the compressor heat exchanger is coupled to exhaust output of diesel engine. Gas-separating unit is made as a hollow-fibre membrane unit. Output of the heat exchanger working medium is coupled to input of additional heater. At that output of the additional heater serves as output of the station.

EFFECT: development of more effective means for oil extraction from low-permeable collectors complicated by high paraffin content.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: according to the method the hydraulic fracturing of formation is performed. After hydraulic fracturing of the formation in the well the proppant underflash is left. From above in addition from the coarse fraction proppant the bridge with a rated length is created. This length is selected in view of the condition of providing of counter-pressure on the proppant in the hydraulic fracturing crack sufficient for holding of proppant in a hydraulic fracturing crack at decrease of liquid level in the well down to the well bottomhole level. The package of downhole pumping equipment includes the antisand filter. During the well operation the antisand filter is placed directly over the proppant bridge. The liquid is sampled. The liquid level during liquid sampling - operation is maintained at the level of the deep-well pump.

EFFECT: increase in oil production.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to equipment used for oil production, and namely, to well expandable screens. The screen is comprised of a support tube with longitudinal slots cut evenly in the circumferential direction with a larger base faced inside and a lesser base faced outside. A swelling elastomer is placed to the slots, on top of the elastomer there are filtering rack brushes retractable outside when the elastomer is swelled out. The body shape of the rack brushes meets the shape of the longitudinal slot while the width of the body exceeds the width of the slot lesser base.

EFFECT: simplified construction, improved capacity of a submersible pump.

3 cl, 6 dwg

Filtering module // 2551596

FIELD: oil-and-gas industry.

SUBSTANCE: device contains a bearing housing designed as a pipe, a shaft, a filtering element consisting of, at least, one unit of independent replaceable ring filtering bushings, installed coaxially with the housing. The module is fitted with, at least, one gripping bushing which is coaxially installed on the housing surface, with, at least, one additional spacer ring on the joint of adjacent of replaceable bushing units, installed on the external surface of the housing and fitted with a radial hole. The centralizer designed as a thin-walled ring frame which has a cross-section with adjacent ledges and hollows in the radial direction, is installed with possibility of adjunction of ledges to the internal surface of the filtering element and hollows to the external surface of the housing. The internal surface of each gripping bushing is fitted with evenly distributed on it radial depressions designed open from the bearing housing and through along a longitudinal axis of the gripping bushing. The external surface of each gripping bushing and the top flange of the module are fitted with ledges. The module case in the zone of location of each sliding bearing is fitted with, at least, one radial channel and a radial hole.

EFFECT: reliability improvement and service life increase, service facilitating, productivity increase.

13 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a body with upper inlet openings, a discharge pipe placed coaxially to the body, with a section of radial openings and a safety valve at the lower butt end, an auger put on to the discharge pipe, a slotted filter covering the section of radial openings of the discharge pipe and a container below the body. The discharge pipe is installed inside the body and the auger is placed between the upper inlet openings and the slotted filter.

EFFECT: improved operational life, maintained stable capacity of the device.

3 cl, 3 dwg

Well screen // 2540748

FIELD: oil and gas industry.

SUBSTANCE: device includes polymer fibrous screening filter element made as separate sections interconnected along outer perimeter by metal tie rods, which are screwed into subpump sleeve or end sleeve at one side and to batwing-shaped sleeve at the other side and one butt end of the filtering element is thrusted to its inner wing. The second butt end of the filtering element is thrusted to end sleeve or subpump sleeve, where valve element is made as feedthrough opening shaped as two cylinders with different base diameter installed one above another, with a gate corresponding in its configuration to the above feedthrough opening. Attachment reliability of the filtering element sections is ensured by double nuts.

EFFECT: improved efficiency of the well screen operation due to increased service life of filtering elements, in particular valve element, simplified movement of its gate.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil industry and can be used in multi layered reservoir development with horizontal wells. The method involves recovering the pools as the productive formation intervals along the horizontal bore of the development well. Filtered pipe strings are lowered. The horizontal well bore is sectioned with packers. The well production is separated. That is followed by the production selection and water injection. The formation is sectioned according to a permeability value. If the sections differ more than twice as much, water-swellable packers are arranged at the section boundaries. A filter inside is provided with a solid horizontal partition extending along the whole filter. This partition is used to separate upper and lower portions of the filter. The partition has a hydrophilic surface having a degree of hydrophility of no less than 99%. Capillary holes have a diameter of no more than 2 mm. The holes density is not less than 50 holes/m. A horizontal position of the partition is controlled by sensors mounted at an inlet and an outlet of the filter. An upper portion of a filter wall is perforated, while a lower portion is solid. A water portion is reduced in a liquid supplied from the well bore through the upper portion of the filter. The water is injected through the hydrophilic surface and capillary holes into the lower portion of the filter. In front of the perforations of the filter, the packer is mounted to cut off an annular space of the well. The lower portion of the filter has holes for water outflow into the annular space. The above water is pumped into another formation. The lower portion of the filter is not connected to the piping string, whereon the filter is lowered. The upper portion of the filter is connected to the pipe string. The low-water fluid is supplied from the upper portion of the filter into the pipe string, which is brought up by means of a pump.

EFFECT: more effective separation of oil and water in the well bore, more effective water-flooding and as a consequence the higher oil recovery factor of the deposit.

3 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes determination of an average distance between fractures, division of the horizontal hole in sections by packers, running in of devices for water influx control at the tubing string to the horizontal hole, product withdrawal from the horizontal well. At that the horizontal hole is divided by water-swellable packers into sections with length of each section from 20 m up to 50 m depending on the distance between fractures and length of the horizontal hole. The devices for water influx control in the horizontal hole have openings in walls with diameter d, which is comparable to the size of oil capillary tubes for this reservoir and the openings are made of water-repellent material. Length of each device for water influx control is from 5 m up to 12 m, and total number of devices does not exceed 5 pieces between packers in each section, total number of the openings N in devices for water influx control in the whole horizontal hole, depression and diameter d of the openings is determined by the ratio. Product from the well is produced provided that hydrodynamic forces created by bottomhole pressure do not exceed capillary forces of oil movement through openings in the devices for water influx control, i.e. depression in the well meets the above ratio.

EFFECT: increase in oil recovery factor.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: to protect downhole rotary pumps from clogging with mechanical impurities, this filter comprises case with filter element and seal arranged at said case to separate filter intake part from discharge part. Said seal is composed of "an umbrella" made up of a carcass of metal spokes with oil-resistant rubber stretched there between. Device is equipped with spring, retainer and charged storage battery, its capacity being designed for lowering to preset depth to keep said umbrella at closed position.

EFFECT: higher reliability of seal and overlap of beds.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of a horizontal well, running in of a production casing with a well screen with shear plugs in openings, and packers. In the drilling process permeability properties are defined, the borehole is divided into zones having the permeability properties differentiating per 1.5-1.6 times, a flow area of the screen openings and a number of openings for each zone is selected. At the mouth the well screen is equipped with a shear funnel and water-swellable packers from the outside, the string is run in into the well and the well screen is fitted so that the water-swellable packers are within boundaries of the formation zones with different properties. The hole is lined, and the following layout is assembled at the mouth: a fishing magnet, a pusher, a rigid centraliser with overflow channels. The assembly is run in to the well until the pusher is rested on the shear funnel, the string is slacked off, and the shear funnel is moved until it rests on the first row of the shear plugs, the string is slacked off completely to the funnel and the first row of the shear plugs is destroyed. The string is moved from the mouth to the bottomhole and the next row of the shear plugs is destroyed and fixed by the fishing magnet. The string is slacked off completely to the funnel again and the remaining rows of plugs are destroyed, the pipe string is run out with the assembly. Openings are isolated in the lower perimeter of the well screen.

EFFECT: improved quality of the formation drilling, reduced time for the well screen fitting.

4 dwg

Well screen // 2514057

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device comprises metal pipe with holes stopped by plug from below and by coupling from above and cylindrical filter element arranged there inside and aligned therewith. Pipe top section with holes is composed by a separate section with no inside filter element coated with screen on the outside. Said section houses rubber diaphragm composed by the sleeve. Diaphragm thickness decreases in vertical line parallel with metal pipe axis and aligned with elongated hole major axis. Proposed filter is composed of sections connected by couplings. Pipe top section with holes is connected with pump on one side or with shank by coupling and with downstream filter section on opposite side.

EFFECT: higher reliability, simplified design, increased MTBR.

3 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in drilling, seepage-volume characteristics of the bed and their alteration over borehole are defined, borehole is divided into zones that differ in said characteristics by 1.5-1.6 times to select filter performance separately for each zone and quantity of holes. Screen filter elements are fitted in filter holes under plugs. Flow string with filter equipped with water- or oil-swelling packers is lowered into well, said packers being set at boundaries of zones with different characteristics and string being fixed. Assembly is assembled at mouth and composed of the following elements arranged from bottom to top, i.e. cutter, locating bearing, screw downhole motor and stiff locator to be lowered against the stop to plugs. At cutting sheared plugs, flow string is displaced downward to remove sheared plugs and to withdraw the flow string. Flexible pipe sting is lowered to work face and displaced therefrom to mouth along with injection of plugging material to isolate holes made at filter bottom perimeter.

EFFECT: higher efficiency of extraction or injection, simplified mounting.

3 dwg

FIELD: mining.

SUBSTANCE: downhole device includes a housing with a channel passing along its axis, a shaft located in the housing and passing through the channel. The shaft is installed so that it can be rotated in axial direction within restricted limits. Downhole device includes a radial bearing arranged in the housing channel to support the shaft. The bearing includes an insert installed in the housing and a sleeve installed on the shaft. The sleeve and the insert have the possibility of interaction. The sleeve has the possibility of being rotated along the housing axis and moved in axial direction together with the shaft. With that, there is a gap between inside diameter of the insert and outside diameter of the sleeve. One of the bearing elements, either the sleeve or the insert, has a smaller axial gap than the other one. Axial ends of the element having the smaller axial size never project beyond axial ends of the other element. As per the other version of the invention, one of the bearing elements, either the sleeve or the insert, has a sharp angle on its axial end for scraping depositions off the interacting surface of the other element.

EFFECT: reduction of formation of depositions in radial bearings for downhole devices.

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